libjxl

decode_test.cc (231070B)

---

 // Copyright (c) the JPEG XL Project Authors. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include "lib/extras/dec/decode.h"
 
 #include <jxl/cms.h>
 #include <jxl/codestream_header.h>
 #include <jxl/color_encoding.h>
 #include <jxl/decode.h>
 #include <jxl/decode_cxx.h>
 #include <jxl/memory_manager.h>
 #include <jxl/parallel_runner.h>
 #include <jxl/resizable_parallel_runner.h>
 #include <jxl/resizable_parallel_runner_cxx.h>
 #include <jxl/thread_parallel_runner.h>
 #include <jxl/thread_parallel_runner_cxx.h>
 #include <jxl/types.h>
 
 #include <algorithm>
 #include <cstdint>
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 #include <ostream>
 #include <set>
 #include <sstream>
 #include <string>
 #include <tuple>
 #include <utility>
 #include <vector>
 
 #include "lib/extras/dec/color_description.h"
 #include "lib/extras/enc/encode.h"
 #include "lib/extras/enc/jpg.h"
 #include "lib/extras/packed_image.h"
 #include "lib/jxl/base/byte_order.h"
 #include "lib/jxl/base/common.h"
 #include "lib/jxl/base/compiler_specific.h"
 #include "lib/jxl/base/override.h"
 #include "lib/jxl/base/span.h"
 #include "lib/jxl/base/status.h"
 #include "lib/jxl/butteraugli/butteraugli.h"
 #include "lib/jxl/cms/color_encoding_cms.h"
 #include "lib/jxl/color_encoding_internal.h"
 #include "lib/jxl/dec_bit_reader.h"
 #include "lib/jxl/dec_external_image.h"
 #include "lib/jxl/enc_aux_out.h"
 #include "lib/jxl/enc_external_image.h"
 #include "lib/jxl/enc_fields.h"
 #include "lib/jxl/enc_frame.h"
 #include "lib/jxl/enc_icc_codec.h"
 #include "lib/jxl/enc_params.h"
 #include "lib/jxl/enc_progressive_split.h"
 #include "lib/jxl/encode_internal.h"
 #include "lib/jxl/fields.h"
 #include "lib/jxl/frame_dimensions.h"
 #include "lib/jxl/frame_header.h"
 #include "lib/jxl/headers.h"
 #include "lib/jxl/image.h"
 #include "lib/jxl/image_bundle.h"
 #include "lib/jxl/image_metadata.h"
 #include "lib/jxl/image_ops.h"
 #include "lib/jxl/jpeg/enc_jpeg_data.h"
 #include "lib/jxl/padded_bytes.h"
 #include "lib/jxl/test_image.h"
 #include "lib/jxl/test_utils.h"
 #include "lib/jxl/testing.h"
 #include "lib/jxl/toc.h"
 
 ////////////////////////////////////////////////////////////////////////////////
 
 namespace {
 void AppendU32BE(uint32_t u32, std::vector<uint8_t>* bytes) {
   bytes->push_back(u32 >> 24);
   bytes->push_back(u32 >> 16);
   bytes->push_back(u32 >> 8);
   bytes->push_back(u32 >> 0);
 }
 
 // What type of codestream format in the boxes to use for testing
 enum CodeStreamBoxFormat {
   // Do not use box format at all, only pure codestream
   kCSBF_None,
   // Have a single codestream box, with its actual size given in the box
   kCSBF_Single,
   // Have a single codestream box, with box size 0 (final box running to end)
   kCSBF_Single_Zero_Terminated,
   // Single codestream box, with another unknown box behind it
   kCSBF_Single_Other,
   // Have multiple partial codestream boxes
   kCSBF_Multi,
   // Have multiple partial codestream boxes, with final box size 0 (running
   // to end)
   kCSBF_Multi_Zero_Terminated,
   // Have multiple partial codestream boxes, terminated by non-codestream box
   kCSBF_Multi_Other_Terminated,
   // Have multiple partial codestream boxes, terminated by non-codestream box
   // that has its size set to 0 (running to end)
   kCSBF_Multi_Other_Zero_Terminated,
   // Have multiple partial codestream boxes, and the first one has a content
   // of zero length
   kCSBF_Multi_First_Empty,
   // Have multiple partial codestream boxes, and the last one has a content
   // of zero length and there is an unknown empty box at the end
   kCSBF_Multi_Last_Empty_Other,
   // Have a compressed exif box before a regular codestream box
   kCSBF_Brob_Exif,
   // Not a value but used for counting amount of enum entries
   kCSBF_NUM_ENTRIES,
 };
 
 // Unknown boxes for testing
 const char* unk1_box_type = "unk1";
 const char* unk1_box_contents = "abcdefghijklmnopqrstuvwxyz";
 const size_t unk1_box_size = strlen(unk1_box_contents);
 const char* unk2_box_type = "unk2";
 const char* unk2_box_contents = "0123456789";
 const size_t unk2_box_size = strlen(unk2_box_contents);
 const char* unk3_box_type = "unk3";
 const char* unk3_box_contents = "ABCDEF123456";
 const size_t unk3_box_size = strlen(unk3_box_contents);
 // Box with brob-compressed exif, including header
 const uint8_t* box_brob_exif = reinterpret_cast<const uint8_t*>(
     "\0\0\0@brobExif\241\350\2\300\177\244v\2525\304\360\27=?\267{"
     "\33\37\314\332\214QX17PT\"\256\0\0\202s\214\313t\333\310\320k\20\276\30"
     "\204\277l$\326c#\1\b");
 size_t box_brob_exif_size = 64;
 // The uncompressed Exif data from the brob box
 const uint8_t* exif_uncompressed = reinterpret_cast<const uint8_t*>(
     "\0\0\0\0MM\0*"
     "\0\0\0\b\0\5\1\22\0\3\0\0\0\1\0\5\0\0\1\32\0\5\0\0\0\1\0\0\0J\1\33\0\5\0\0"
     "\0\1\0\0\0R\1("
     "\0\3\0\0\0\1\0\1\0\0\2\23\0\3\0\0\0\1\0\1\0\0\0\0\0\0\0\0\0\1\0\0\0\1\0\0"
     "\0\1\0\0\0\1");
 size_t exif_uncompressed_size = 94;
 
 // Returns an ICC profile output by the JPEG XL decoder for RGB_D65_SRG_Rel_Lin,
 // but with, on purpose, rXYZ, bXYZ and gXYZ (the RGB primaries) switched to a
 // different order to ensure the profile does not match any known profile, so
 // the encoder cannot encode it in a compact struct instead.
 jxl::IccBytes GetIccTestProfile() {
   const uint8_t* profile = reinterpret_cast<const uint8_t*>(
       "\0\0\3\200lcms\0040\0\0mntrRGB XYZ "
       "\a\344\0\a\0\27\0\21\0$"
       "\0\37acspAPPL\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\366"
       "\326\0\1\0\0\0\0\323-lcms\372c\207\36\227\200{"
       "\2\232s\255\327\340\0\n\26\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
       "\0\0\0\0\0\0\0\0\rdesc\0\0\1 "
       "\0\0\0Bcprt\0\0\1d\0\0\1\0wtpt\0\0\2d\0\0\0\24chad\0\0\2x\0\0\0,"
       "bXYZ\0\0\2\244\0\0\0\24gXYZ\0\0\2\270\0\0\0\24rXYZ\0\0\2\314\0\0\0\24rTR"
       "C\0\0\2\340\0\0\0 gTRC\0\0\2\340\0\0\0 bTRC\0\0\2\340\0\0\0 "
       "chrm\0\0\3\0\0\0\0$dmnd\0\0\3$\0\0\0("
       "dmdd\0\0\3L\0\0\0002mluc\0\0\0\0\0\0\0\1\0\0\0\fenUS\0\0\0&"
       "\0\0\0\34\0R\0G\0B\0_\0D\0006\0005\0_\0S\0R\0G\0_\0R\0e\0l\0_"
       "\0L\0i\0n\0\0mluc\0\0\0\0\0\0\0\1\0\0\0\fenUS\0\0\0\344\0\0\0\34\0C\0o\0"
       "p\0y\0r\0i\0g\0h\0t\0 \0002\0000\0001\08\0 \0G\0o\0o\0g\0l\0e\0 "
       "\0L\0L\0C\0,\0 \0C\0C\0-\0B\0Y\0-\0S\0A\0 \0003\0.\0000\0 "
       "\0U\0n\0p\0o\0r\0t\0e\0d\0 "
       "\0l\0i\0c\0e\0n\0s\0e\0(\0h\0t\0t\0p\0s\0:\0/\0/"
       "\0c\0r\0e\0a\0t\0i\0v\0e\0c\0o\0m\0m\0o\0n\0s\0.\0o\0r\0g\0/"
       "\0l\0i\0c\0e\0n\0s\0e\0s\0/\0b\0y\0-\0s\0a\0/\0003\0.\0000\0/"
       "\0l\0e\0g\0a\0l\0c\0o\0d\0e\0)XYZ "
       "\0\0\0\0\0\0\366\326\0\1\0\0\0\0\323-"
       "sf32\0\0\0\0\0\1\fB\0\0\5\336\377\377\363%"
       "\0\0\a\223\0\0\375\220\377\377\373\241\377\377\375\242\0\0\3\334\0\0\300"
       "nXYZ \0\0\0\0\0\0o\240\0\08\365\0\0\3\220XYZ "
       "\0\0\0\0\0\0$\237\0\0\17\204\0\0\266\304XYZ "
       "\0\0\0\0\0\0b\227\0\0\267\207\0\0\30\331para\0\0\0\0\0\3\0\0\0\1\0\0\0\1"
       "\0\0\0\0\0\0\0\1\0\0\0\0\0\0chrm\0\0\0\0\0\3\0\0\0\0\243\327\0\0T|"
       "\0\0L\315\0\0\231\232\0\0&"
       "g\0\0\17\\mluc\0\0\0\0\0\0\0\1\0\0\0\fenUS\0\0\0\f\0\0\0\34\0G\0o\0o\0g"
       "\0l\0emluc\0\0\0\0\0\0\0\1\0\0\0\fenUS\0\0\0\26\0\0\0\34\0I\0m\0a\0g\0e"
       "\0 \0c\0o\0d\0e\0c\0\0");
   size_t profile_size = 896;
   jxl::IccBytes icc_profile;
   icc_profile.assign(profile, profile + profile_size);
   return icc_profile;
 }
 
 }  // namespace
 
 namespace jxl {
 namespace {
 
 void AppendTestBox(const char* type, const char* contents, size_t contents_size,
                    bool unbounded, std::vector<uint8_t>* bytes) {
   AppendU32BE(contents_size + 8, bytes);
   bytes->push_back(type[0]);
   bytes->push_back(type[1]);
   bytes->push_back(type[2]);
   bytes->push_back(type[3]);
   const uint8_t* contents_u = reinterpret_cast<const uint8_t*>(contents);
   Bytes(contents_u, contents_size).AppendTo(*bytes);
 }
 
 enum PreviewMode {
   kNoPreview,
   kSmallPreview,
   kBigPreview,
   kNumPreviewModes,
 };
 
 void GeneratePreview(PreviewMode preview_mode, ImageBundle* ib) {
   if (preview_mode == kSmallPreview) {
     ib->ShrinkTo(ib->xsize() / 7, ib->ysize() / 7);
   } else if (preview_mode == kBigPreview) {
     auto upsample7 = [&](const ImageF& in, ImageF* out) {
       for (size_t y = 0; y < out->ysize(); ++y) {
         for (size_t x = 0; x < out->xsize(); ++x) {
           out->Row(y)[x] = in.ConstRow(y / 7)[x / 7];
         }
       }
     };
     JXL_ASSIGN_OR_DIE(Image3F preview,
                       Image3F::Create(ib->xsize() * 7, ib->ysize() * 7));
     for (size_t c = 0; c < 3; ++c) {
       upsample7(ib->color()->Plane(c), &preview.Plane(c));
     }
     std::vector<ImageF> extra_channels;
     for (size_t i = 0; i < ib->extra_channels().size(); ++i) {
       JXL_ASSIGN_OR_DIE(ImageF ec,
                         ImageF::Create(ib->xsize() * 7, ib->ysize() * 7));
       upsample7(ib->extra_channels()[i], &ec);
       extra_channels.emplace_back(std::move(ec));
     }
     ib->RemoveColor();
     ib->ClearExtraChannels();
     ib->SetFromImage(std::move(preview), ib->c_current());
     ib->SetExtraChannels(std::move(extra_channels));
   }
 }
 
 struct TestCodestreamParams {
   CompressParams cparams;
   CodeStreamBoxFormat box_format = kCSBF_None;
   JxlOrientation orientation = JXL_ORIENT_IDENTITY;
   PreviewMode preview_mode = kNoPreview;
   bool add_intrinsic_size = false;
   bool add_icc_profile = false;
   float intensity_target = 0.0;
   std::string color_space;
   std::vector<uint8_t>* jpeg_codestream = nullptr;
 };
 
 // Input pixels always given as 16-bit RGBA, 8 bytes per pixel.
 // include_alpha determines if the encoded image should contain the alpha
 // channel.
 // add_icc_profile: if false, encodes the image as sRGB using the JXL fields,
 // for grayscale or RGB images. If true, encodes the image using the ICC profile
 // returned by GetIccTestProfile, without the JXL fields, this requires the
 // image is RGB, not grayscale.
 // Providing jpeg_codestream will populate the jpeg_codestream with compressed
 // JPEG bytes, and make it possible to reconstruct those exact JPEG bytes using
 // the return value _if_ add_container indicates a box format.
 std::vector<uint8_t> CreateTestJXLCodestream(
     Span<const uint8_t> pixels, size_t xsize, size_t ysize, size_t num_channels,
     const TestCodestreamParams& params) {
   // Compress the pixels with JPEG XL.
   bool grayscale = (num_channels <= 2);
   bool have_alpha = ((num_channels & 1) == 0);
   bool include_alpha = have_alpha && params.jpeg_codestream == nullptr;
   size_t bitdepth = params.jpeg_codestream == nullptr ? 16 : 8;
   CodecInOut io;
   io.SetSize(xsize, ysize);
   ColorEncoding color_encoding;
   if (params.add_icc_profile) {
     // the hardcoded ICC profile we attach requires RGB.
     EXPECT_EQ(false, grayscale);
     EXPECT_TRUE(params.color_space.empty());
     EXPECT_TRUE(color_encoding.SetICC(GetIccTestProfile(), JxlGetDefaultCms()));
   } else if (!params.color_space.empty()) {
     JxlColorEncoding c;
     EXPECT_TRUE(jxl::ParseDescription(params.color_space, &c));
     EXPECT_TRUE(color_encoding.FromExternal(c));
     EXPECT_EQ(color_encoding.IsGray(), grayscale);
   } else {
     color_encoding = jxl::ColorEncoding::SRGB(/*is_gray=*/grayscale);
   }
   io.metadata.m.SetUintSamples(bitdepth);
   if (include_alpha) {
     io.metadata.m.SetAlphaBits(bitdepth);
   }
   if (params.intensity_target != 0) {
     io.metadata.m.SetIntensityTarget(params.intensity_target);
   }
   JxlPixelFormat format = {static_cast<uint32_t>(num_channels), JXL_TYPE_UINT16,
                            JXL_BIG_ENDIAN, 0};
   // Make the grayscale-ness of the io metadata color_encoding and the packed
   // image match.
   io.metadata.m.color_encoding = color_encoding;
   EXPECT_TRUE(ConvertFromExternal(pixels, xsize, ysize, color_encoding,
                                   /*bits_per_sample=*/16, format,
                                   /* pool */ nullptr, &io.Main()));
   std::vector<uint8_t> jpeg_data;
   if (params.jpeg_codestream != nullptr) {
     if (jxl::extras::CanDecode(jxl::extras::Codec::kJPG)) {
       std::vector<uint8_t> jpeg_bytes;
       extras::PackedPixelFile ppf;
       extras::PackedFrame frame(xsize, ysize, format);
       JXL_ASSERT(frame.color.pixels_size == pixels.size());
       memcpy(frame.color.pixels(0, 0, 0), pixels.data(), pixels.size());
       ppf.frames.emplace_back(std::move(frame));
       ppf.info.xsize = xsize;
       ppf.info.ysize = ysize;
       ppf.info.num_color_channels = grayscale ? 1 : 3;
       ppf.info.bits_per_sample = 16;
       auto encoder = extras::GetJPEGEncoder();
       encoder->SetOption("quality", "70");
       extras::EncodedImage encoded;
       EXPECT_TRUE(encoder->Encode(ppf, &encoded, nullptr));
       jpeg_bytes = encoded.bitstreams[0];
       Bytes(jpeg_bytes).AppendTo(*params.jpeg_codestream);
       EXPECT_TRUE(jxl::jpeg::DecodeImageJPG(
           jxl::Bytes(jpeg_bytes.data(), jpeg_bytes.size()), &io));
       EXPECT_TRUE(
           EncodeJPEGData(*io.Main().jpeg_data, &jpeg_data, params.cparams));
       io.metadata.m.xyb_encoded = false;
     } else {
       JXL_ABORT(
           "unable to create reconstructible JPEG without JPEG support enabled");
     }
   }
   if (params.preview_mode) {
     JXL_ASSIGN_OR_DIE(io.preview_frame, io.Main().Copy());
     GeneratePreview(params.preview_mode, &io.preview_frame);
     io.metadata.m.have_preview = true;
     EXPECT_TRUE(io.metadata.m.preview_size.Set(io.preview_frame.xsize(),
                                                io.preview_frame.ysize()));
   }
   if (params.add_intrinsic_size) {
     EXPECT_TRUE(io.metadata.m.intrinsic_size.Set(xsize / 3, ysize / 3));
   }
   io.metadata.m.orientation = params.orientation;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(test::EncodeFile(params.cparams, &io, &compressed));
   CodeStreamBoxFormat add_container = params.box_format;
   if (add_container != kCSBF_None) {
     // Header with signature box and ftyp box.
     const uint8_t header[] = {0,    0,    0,    0xc,  0x4a, 0x58, 0x4c, 0x20,
                               0xd,  0xa,  0x87, 0xa,  0,    0,    0,    0x14,
                               0x66, 0x74, 0x79, 0x70, 0x6a, 0x78, 0x6c, 0x20,
                               0,    0,    0,    0,    0x6a, 0x78, 0x6c, 0x20};
 
     bool is_multi = add_container == kCSBF_Multi ||
                     add_container == kCSBF_Multi_Zero_Terminated ||
                     add_container == kCSBF_Multi_Other_Terminated ||
                     add_container == kCSBF_Multi_Other_Zero_Terminated ||
                     add_container == kCSBF_Multi_First_Empty ||
                     add_container == kCSBF_Multi_Last_Empty_Other;
 
     if (is_multi) {
       size_t third = compressed.size() / 3;
       std::vector<uint8_t> compressed0(compressed.data(),
                                        compressed.data() + third);
       std::vector<uint8_t> compressed1(compressed.data() + third,
                                        compressed.data() + 2 * third);
       std::vector<uint8_t> compressed2(compressed.data() + 2 * third,
                                        compressed.data() + compressed.size());
 
       std::vector<uint8_t> c;
       Bytes(header).AppendTo(c);
       if (params.jpeg_codestream != nullptr) {
         jxl::AppendBoxHeader(jxl::MakeBoxType("jbrd"), jpeg_data.size(), false,
                              &c);
         Bytes(jpeg_data).AppendTo(c);
       }
       uint32_t jxlp_index = 0;
       if (add_container == kCSBF_Multi_First_Empty) {
         // Empty placeholder codestream part
         AppendU32BE(12, &c);
         c.push_back('j');
         c.push_back('x');
         c.push_back('l');
         c.push_back('p');
         AppendU32BE(jxlp_index++, &c);
       }
       // First codestream part
       AppendU32BE(compressed0.size() + 12, &c);
       c.push_back('j');
       c.push_back('x');
       c.push_back('l');
       c.push_back('p');
       AppendU32BE(jxlp_index++, &c);
       Bytes(compressed0).AppendTo(c);
       // A few non-codestream boxes in between
       AppendTestBox(unk1_box_type, unk1_box_contents, unk1_box_size, false, &c);
       AppendTestBox(unk2_box_type, unk2_box_contents, unk2_box_size, false, &c);
       // Empty placeholder codestream part
       AppendU32BE(12, &c);
       c.push_back('j');
       c.push_back('x');
       c.push_back('l');
       c.push_back('p');
       AppendU32BE(jxlp_index++, &c);
       // Second codestream part
       AppendU32BE(compressed1.size() + 12, &c);
       c.push_back('j');
       c.push_back('x');
       c.push_back('l');
       c.push_back('p');
       AppendU32BE(jxlp_index++, &c);
       Bytes(compressed1).AppendTo(c);
       // Third (last) codestream part
       AppendU32BE(add_container == kCSBF_Multi_Zero_Terminated
                       ? 0
                       : (compressed2.size() + 12),
                   &c);
       c.push_back('j');
       c.push_back('x');
       c.push_back('l');
       c.push_back('p');
       if (add_container != kCSBF_Multi_Last_Empty_Other) {
         AppendU32BE(jxlp_index++ | 0x80000000, &c);
       } else {
         AppendU32BE(jxlp_index++, &c);
       }
       Bytes(compressed2).AppendTo(c);
       if (add_container == kCSBF_Multi_Last_Empty_Other) {
         // Empty placeholder codestream part
         AppendU32BE(12, &c);
         c.push_back('j');
         c.push_back('x');
         c.push_back('l');
         c.push_back('p');
         AppendU32BE(jxlp_index++ | 0x80000000, &c);
         AppendTestBox(unk3_box_type, unk3_box_contents, unk3_box_size, false,
                       &c);
       }
       if (add_container == kCSBF_Multi_Other_Terminated) {
         AppendTestBox(unk3_box_type, unk3_box_contents, unk3_box_size, false,
                       &c);
       }
       if (add_container == kCSBF_Multi_Other_Zero_Terminated) {
         AppendTestBox(unk3_box_type, unk3_box_contents, unk3_box_size, true,
                       &c);
       }
       compressed.swap(c);
     } else {
       std::vector<uint8_t> c;
       Bytes(header).AppendTo(c);
       if (params.jpeg_codestream != nullptr) {
         jxl::AppendBoxHeader(jxl::MakeBoxType("jbrd"), jpeg_data.size(), false,
                              &c);
         Bytes(jpeg_data).AppendTo(c);
       }
       if (add_container == kCSBF_Brob_Exif) {
         Bytes(box_brob_exif, box_brob_exif_size).AppendTo(c);
       }
       AppendU32BE(add_container == kCSBF_Single_Zero_Terminated
                       ? 0
                       : (compressed.size() + 8),
                   &c);
       c.push_back('j');
       c.push_back('x');
       c.push_back('l');
       c.push_back('c');
       Bytes(compressed).AppendTo(c);
       if (add_container == kCSBF_Single_Other) {
         AppendTestBox(unk1_box_type, unk1_box_contents, unk1_box_size, false,
                       &c);
       }
       compressed.swap(c);
     }
   }
 
   return compressed;
 }
 
 JxlDecoderStatus ProcessInputIgnoreBoxes(JxlDecoder* dec) {
   JxlDecoderStatus status = JXL_DEC_BOX;
   while (status == JXL_DEC_BOX) {
     status = JxlDecoderProcessInput(dec);
   }
   return status;
 }
 
 // Decodes one-shot with the API for non-streaming decoding tests.
 std::vector<uint8_t> DecodeWithAPI(JxlDecoder* dec,
                                    Span<const uint8_t> compressed,
                                    const JxlPixelFormat& format,
                                    bool use_callback, bool set_buffer_early,
                                    bool use_resizable_runner,
                                    bool require_boxes, bool expect_success,
                                    std::vector<uint8_t>* icc = nullptr) {
   JxlThreadParallelRunnerPtr runner_fixed;
   JxlResizableParallelRunnerPtr runner_resizable;
   JxlParallelRunner runner_fn;
   void* runner;
 
   if (use_resizable_runner) {
     runner_resizable = JxlResizableParallelRunnerMake(nullptr);
     runner = runner_resizable.get();
     runner_fn = JxlResizableParallelRunner;
   } else {
     size_t hw_threads = JxlThreadParallelRunnerDefaultNumWorkerThreads();
     runner_fixed =
         JxlThreadParallelRunnerMake(nullptr, std::min<size_t>(hw_threads, 16));
     runner = runner_fixed.get();
     runner_fn = JxlThreadParallelRunner;
   }
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, runner_fn, runner));
 
   auto process_input =
       require_boxes ? ProcessInputIgnoreBoxes : JxlDecoderProcessInput;
 
   EXPECT_EQ(
       JXL_DEC_SUCCESS,
       JxlDecoderSubscribeEvents(
           dec, JXL_DEC_BASIC_INFO | (set_buffer_early ? JXL_DEC_FRAME : 0) |
                    JXL_DEC_PREVIEW_IMAGE | JXL_DEC_FULL_IMAGE |
                    (require_boxes ? JXL_DEC_BOX : 0) |
                    (icc != nullptr ? JXL_DEC_COLOR_ENCODING : 0)));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, process_input(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   if (use_resizable_runner) {
     JxlResizableParallelRunnerSetThreads(
         runner,
         JxlResizableParallelRunnerSuggestThreads(info.xsize, info.ysize));
   }
 
   std::vector<uint8_t> pixels(buffer_size);
   size_t bytes_per_pixel = format.num_channels *
                            test::GetDataBits(format.data_type) /
                            jxl::kBitsPerByte;
   size_t stride = bytes_per_pixel * info.xsize;
   if (format.align > 1) {
     stride = jxl::DivCeil(stride, format.align) * format.align;
   }
   auto callback = [&](size_t x, size_t y, size_t num_pixels,
                       const void* pixels_row) {
     memcpy(pixels.data() + stride * y + bytes_per_pixel * x, pixels_row,
            num_pixels * bytes_per_pixel);
   };
 
   JxlDecoderStatus status = process_input(dec);
 
   if (status == JXL_DEC_COLOR_ENCODING) {
     size_t icc_size = 0;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                           &icc_size));
     icc->resize(icc_size);
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderGetColorAsICCProfile(dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                              icc->data(), icc_size));
 
     status = process_input(dec);
   }
 
   std::vector<uint8_t> preview;
   if (status == JXL_DEC_NEED_PREVIEW_OUT_BUFFER) {
     size_t buffer_size;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderPreviewOutBufferSize(dec, &format, &buffer_size));
     preview.resize(buffer_size);
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetPreviewOutBuffer(dec, &format, preview.data(),
                                             preview.size()));
     EXPECT_EQ(JXL_DEC_PREVIEW_IMAGE, process_input(dec));
 
     status = process_input(dec);
   }
 
   if (set_buffer_early) {
     EXPECT_EQ(JXL_DEC_FRAME, status);
   } else {
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, status);
   }
 
   if (use_callback) {
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetImageOutCallback(
                   dec, &format,
                   [](void* opaque, size_t x, size_t y, size_t xsize,
                      const void* pixels_row) {
                     auto cb = static_cast<decltype(&callback)>(opaque);
                     (*cb)(x, y, xsize, pixels_row);
                   },
                   /*opaque=*/&callback));
   } else {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
   }
 
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, process_input(dec));
 
   // After the full image was output, JxlDecoderProcessInput should return
   // success to indicate all is done, unless we requested boxes and the last
   // box was not a terminal unbounded box, in which case it should ask for
   // more input.
   JxlDecoderStatus expected_status =
       expect_success ? JXL_DEC_SUCCESS : JXL_DEC_NEED_MORE_INPUT;
   EXPECT_EQ(expected_status, process_input(dec));
 
   return pixels;
 }
 
 // Decodes one-shot with the API for non-streaming decoding tests.
 std::vector<uint8_t> DecodeWithAPI(Span<const uint8_t> compressed,
                                    const JxlPixelFormat& format,
                                    bool use_callback, bool set_buffer_early,
                                    bool use_resizable_runner,
                                    bool require_boxes, bool expect_success) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   std::vector<uint8_t> pixels =
       DecodeWithAPI(dec, compressed, format, use_callback, set_buffer_early,
                     use_resizable_runner, require_boxes, expect_success);
   JxlDecoderDestroy(dec);
   return pixels;
 }
 
 }  // namespace
 }  // namespace jxl
 
 ////////////////////////////////////////////////////////////////////////////////
 
 using jxl::Image3F;
 using jxl::ImageF;
 using jxl::test::BoolToCStr;
 using jxl::test::ButteraugliDistance;
 
 TEST(DecodeTest, JxlSignatureCheckTest) {
   std::vector<std::pair<int, std::vector<uint8_t>>> tests = {
       // No JPEGXL header starts with 'a'.
       {JXL_SIG_INVALID, {'a'}},
       {JXL_SIG_INVALID, {'a', 'b', 'c', 'd', 'e', 'f'}},
 
       // Empty file is not enough bytes.
       {JXL_SIG_NOT_ENOUGH_BYTES, {}},
 
       // JPEGXL headers.
       {JXL_SIG_NOT_ENOUGH_BYTES, {0xff}},  // Part of a signature.
       {JXL_SIG_INVALID, {0xff, 0xD8}},     // JPEG-1
       {JXL_SIG_CODESTREAM, {0xff, 0x0a}},
 
       // JPEGXL container file.
       {JXL_SIG_CONTAINER,
        {0, 0, 0, 0xc, 'J', 'X', 'L', ' ', 0xD, 0xA, 0x87, 0xA}},
       // Ending with invalid byte.
       {JXL_SIG_INVALID, {0, 0, 0, 0xc, 'J', 'X', 'L', ' ', 0xD, 0xA, 0x87, 0}},
       // Part of signature.
       {JXL_SIG_NOT_ENOUGH_BYTES,
        {0, 0, 0, 0xc, 'J', 'X', 'L', ' ', 0xD, 0xA, 0x87}},
       {JXL_SIG_NOT_ENOUGH_BYTES, {0}},
   };
   for (const auto& test : tests) {
     EXPECT_EQ(test.first,
               JxlSignatureCheck(test.second.data(), test.second.size()))
         << "Where test data is " << ::testing::PrintToString(test.second);
   }
 }
 
 TEST(DecodeTest, DefaultAllocTest) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_NE(nullptr, dec);
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, CustomAllocTest) {
   struct CalledCounters {
     int allocs = 0;
     int frees = 0;
   } counters;
 
   JxlMemoryManager mm;
   mm.opaque = &counters;
   mm.alloc = [](void* opaque, size_t size) {
     reinterpret_cast<CalledCounters*>(opaque)->allocs++;
     return malloc(size);
   };
   mm.free = [](void* opaque, void* address) {
     reinterpret_cast<CalledCounters*>(opaque)->frees++;
     free(address);
   };
 
   JxlDecoder* dec = JxlDecoderCreate(&mm);
   EXPECT_NE(nullptr, dec);
   EXPECT_LE(1, counters.allocs);
   EXPECT_EQ(0, counters.frees);
   JxlDecoderDestroy(dec);
   EXPECT_LE(1, counters.frees);
 }
 
 // TODO(lode): add multi-threaded test when multithreaded pixel decoding from
 // API is implemented.
 TEST(DecodeTest, DefaultParallelRunnerTest) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_NE(nullptr, dec);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, nullptr, nullptr));
   JxlDecoderDestroy(dec);
 }
 
 // Creates the header of a JPEG XL file with various custom parameters for
 // testing.
 // xsize, ysize: image dimensions to store in the SizeHeader, max 512.
 // bits_per_sample, orientation: a selection of header parameters to test with.
 // orientation: image orientation to set in the metadata
 // alpha_bits: if non-0, alpha extra channel bits to set in the metadata. Also
 //   gives the alpha channel the name "alpha_test"
 // have_container: add box container format around the codestream.
 // metadata_default: if true, ImageMetadata is set to default and
 //   bits_per_sample, orientation and alpha_bits are ignored.
 // insert_box: insert an extra box before the codestream box, making the header
 // farther away from the front than is ideal. Only used if have_container.
 std::vector<uint8_t> GetTestHeader(size_t xsize, size_t ysize,
                                    size_t bits_per_sample, size_t orientation,
                                    size_t alpha_bits, bool xyb_encoded,
                                    bool have_container, bool metadata_default,
                                    bool insert_extra_box,
                                    const jxl::IccBytes& icc_profile) {
   jxl::BitWriter writer;
   jxl::BitWriter::Allotment allotment(&writer, 65536);  // Large enough
 
   if (have_container) {
     const std::vector<uint8_t> signature_box = {0,   0,   0,   0xc, 'J',  'X',
                                                 'L', ' ', 0xd, 0xa, 0x87, 0xa};
     const std::vector<uint8_t> filetype_box = {
         0,   0,   0, 0x14, 'f', 't', 'y', 'p', 'j', 'x',
         'l', ' ', 0, 0,    0,   0,   'j', 'x', 'l', ' '};
     const std::vector<uint8_t> extra_box_header = {0,   0,   0,   0xff,
                                                    't', 'e', 's', 't'};
     // Beginning of codestream box, with an arbitrary size certainly large
     // enough to contain the header
     const std::vector<uint8_t> codestream_box_header = {0,   0,   0,   0xff,
                                                         'j', 'x', 'l', 'c'};
 
     for (uint8_t c : signature_box) {
       writer.Write(8, c);
     }
     for (uint8_t c : filetype_box) {
       writer.Write(8, c);
     }
     if (insert_extra_box) {
       for (uint8_t c : extra_box_header) {
         writer.Write(8, c);
       }
       for (size_t i = 0; i < 255 - 8; i++) {
         writer.Write(8, 0);
       }
     }
     for (uint8_t c : codestream_box_header) {
       writer.Write(8, c);
     }
   }
 
   // JXL signature
   writer.Write(8, 0xff);
   writer.Write(8, 0x0a);
 
   // SizeHeader
   jxl::CodecMetadata metadata;
   EXPECT_TRUE(metadata.size.Set(xsize, ysize));
   EXPECT_TRUE(WriteSizeHeader(metadata.size, &writer, 0, nullptr));
 
   if (!metadata_default) {
     metadata.m.SetUintSamples(bits_per_sample);
     metadata.m.orientation = orientation;
     metadata.m.SetAlphaBits(alpha_bits);
     metadata.m.xyb_encoded = xyb_encoded;
     if (alpha_bits != 0) {
       metadata.m.extra_channel_info[0].name = "alpha_test";
     }
   }
 
   if (!icc_profile.empty()) {
     jxl::IccBytes copy = icc_profile;
     EXPECT_TRUE(
         metadata.m.color_encoding.SetICC(std::move(copy), JxlGetDefaultCms()));
   }
 
   EXPECT_TRUE(jxl::Bundle::Write(metadata.m, &writer, 0, nullptr));
   metadata.transform_data.nonserialized_xyb_encoded = metadata.m.xyb_encoded;
   EXPECT_TRUE(jxl::Bundle::Write(metadata.transform_data, &writer, 0, nullptr));
 
   if (!icc_profile.empty()) {
     EXPECT_TRUE(metadata.m.color_encoding.WantICC());
     EXPECT_TRUE(jxl::WriteICC(icc_profile, &writer, 0, nullptr));
   }
 
   writer.ZeroPadToByte();
   allotment.ReclaimAndCharge(&writer, 0, nullptr);
   return std::vector<uint8_t>(
       writer.GetSpan().data(),
       writer.GetSpan().data() + writer.GetSpan().size());
 }
 
 TEST(DecodeTest, BasicInfoTest) {
   size_t xsize[2] = {50, 33};
   size_t ysize[2] = {50, 77};
   size_t bits_per_sample[2] = {8, 23};
   size_t orientation[2] = {3, 5};
   size_t alpha_bits[2] = {0, 8};
   bool have_container[2] = {false, true};
   bool xyb_encoded = false;
 
   std::vector<std::vector<uint8_t>> test_samples;
   // Test with direct codestream
   test_samples.push_back(GetTestHeader(
       xsize[0], ysize[0], bits_per_sample[0], orientation[0], alpha_bits[0],
       xyb_encoded, have_container[0], /*metadata_default=*/false,
       /*insert_extra_box=*/false, {}));
   // Test with container and different parameters
   test_samples.push_back(GetTestHeader(
       xsize[1], ysize[1], bits_per_sample[1], orientation[1], alpha_bits[1],
       xyb_encoded, have_container[1], /*metadata_default=*/false,
       /*insert_extra_box=*/false, {}));
 
   for (size_t i = 0; i < test_samples.size(); ++i) {
     const std::vector<uint8_t>& data = test_samples[i];
     // Test decoding too small header first, until we reach the final byte.
     for (size_t size = 0; size <= data.size(); ++size) {
       // Test with a new decoder for each tested byte size.
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
       const uint8_t* next_in = data.data();
       size_t avail_in = size;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
       JxlDecoderStatus status = JxlDecoderProcessInput(dec);
 
       JxlBasicInfo info;
       JxlDecoderStatus bi_status = JxlDecoderGetBasicInfo(dec, &info);
       bool have_basic_info = (bi_status == JXL_DEC_SUCCESS);
 
       if (size == data.size()) {
         EXPECT_EQ(JXL_DEC_BASIC_INFO, status);
 
         // All header bytes given so the decoder must have the basic info.
         EXPECT_EQ(true, have_basic_info);
         EXPECT_EQ(have_container[i], FROM_JXL_BOOL(info.have_container));
         EXPECT_EQ(alpha_bits[i], info.alpha_bits);
         // Orientations 5..8 swap the dimensions
         if (orientation[i] >= 5) {
           EXPECT_EQ(xsize[i], info.ysize);
           EXPECT_EQ(ysize[i], info.xsize);
         } else {
           EXPECT_EQ(xsize[i], info.xsize);
           EXPECT_EQ(ysize[i], info.ysize);
         }
         // The API should set the orientation to identity by default since it
         // already applies the transformation internally by default.
         EXPECT_EQ(1u, info.orientation);
 
         EXPECT_EQ(3u, info.num_color_channels);
 
         if (alpha_bits[i] != 0) {
           // Expect an extra channel
           EXPECT_EQ(1u, info.num_extra_channels);
           JxlExtraChannelInfo extra;
           EXPECT_EQ(0, JxlDecoderGetExtraChannelInfo(dec, 0, &extra));
           EXPECT_EQ(alpha_bits[i], extra.bits_per_sample);
           EXPECT_EQ(JXL_CHANNEL_ALPHA, extra.type);
           EXPECT_EQ(0, extra.alpha_premultiplied);
           // Verify the name "alpha_test" given to the alpha channel
           EXPECT_EQ(10u, extra.name_length);
           char name[11];
           EXPECT_EQ(0,
                     JxlDecoderGetExtraChannelName(dec, 0, name, sizeof(name)));
           EXPECT_EQ(std::string("alpha_test"), std::string(name));
         } else {
           EXPECT_EQ(0u, info.num_extra_channels);
         }
 
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
       } else {
         // If we did not give the full header, the basic info should not be
         // available. Allow a few bytes of slack due to some bits for default
         // opsinmatrix/extension bits.
         if (size + 2 < data.size()) {
           EXPECT_EQ(false, have_basic_info);
           EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, status);
         }
       }
 
       // Test that decoder doesn't allow setting a setting required at beginning
       // unless it's reset
       EXPECT_EQ(JXL_DEC_ERROR,
                 JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
       JxlDecoderReset(dec);
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
 
       JxlDecoderDestroy(dec);
     }
   }
 }
 
 TEST(DecodeTest, BufferSizeTest) {
   size_t xsize = 33;
   size_t ysize = 77;
   size_t bits_per_sample = 8;
   size_t orientation = 1;
   size_t alpha_bits = 8;
   bool have_container = false;
   bool xyb_encoded = false;
 
   std::vector<uint8_t> header =
       GetTestHeader(xsize, ysize, bits_per_sample, orientation, alpha_bits,
                     xyb_encoded, have_container, /*metadata_default=*/false,
                     /*insert_extra_box=*/false, {});
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
   const uint8_t* next_in = header.data();
   size_t avail_in = header.size();
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   JxlDecoderStatus status = JxlDecoderProcessInput(dec);
   EXPECT_EQ(JXL_DEC_BASIC_INFO, status);
 
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(xsize, info.xsize);
   EXPECT_EQ(ysize, info.ysize);
 
   JxlPixelFormat format = {4, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
   size_t image_out_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &image_out_size));
   EXPECT_EQ(xsize * ysize * 4, image_out_size);
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, BasicInfoSizeHintTest) {
   // Test on a file where the size hint is too small initially due to inserting
   // a box before the codestream (something that is normally not recommended)
   size_t xsize = 50;
   size_t ysize = 50;
   size_t bits_per_sample = 16;
   size_t orientation = 1;
   size_t alpha_bits = 0;
   bool xyb_encoded = false;
   std::vector<uint8_t> data = GetTestHeader(
       xsize, ysize, bits_per_sample, orientation, alpha_bits, xyb_encoded,
       /*have_container=*/true, /*metadata_default=*/false,
       /*insert_extra_box=*/true, {});
 
   JxlDecoderStatus status;
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
 
   size_t hint0 = JxlDecoderSizeHintBasicInfo(dec);
   // Test that the test works as intended: we construct a file on purpose to
   // be larger than the first hint by having that extra box.
   EXPECT_LT(hint0, data.size());
   const uint8_t* next_in = data.data();
   // Do as if we have only as many bytes as indicated by the hint available
   size_t avail_in = std::min(hint0, data.size());
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   status = JxlDecoderProcessInput(dec);
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, status);
   // Basic info cannot be available yet due to the extra inserted box.
   EXPECT_EQ(false, !JxlDecoderGetBasicInfo(dec, nullptr));
 
   size_t num_read = avail_in - JxlDecoderReleaseInput(dec);
   EXPECT_LT(num_read, data.size());
 
   size_t hint1 = JxlDecoderSizeHintBasicInfo(dec);
   // The hint must be larger than the previous hint (taking already processed
   // bytes into account, the hint is a hint for the next avail_in) since the
   // decoder now knows there is a box in between.
   EXPECT_GT(hint1 + num_read, hint0);
   avail_in = std::min<size_t>(hint1, data.size() - num_read);
   next_in += num_read;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   status = JxlDecoderProcessInput(dec);
   EXPECT_EQ(JXL_DEC_BASIC_INFO, status);
   JxlBasicInfo info;
   // We should have the basic info now, since we only added one box in-between,
   // and the decoder should have known its size, its implementation can return
   // a correct hint.
   EXPECT_EQ(true, !JxlDecoderGetBasicInfo(dec, &info));
 
   // Also test if the basic info is correct.
   EXPECT_EQ(1, info.have_container);
   EXPECT_EQ(xsize, info.xsize);
   EXPECT_EQ(ysize, info.ysize);
   EXPECT_EQ(orientation, info.orientation);
   EXPECT_EQ(bits_per_sample, info.bits_per_sample);
 
   JxlDecoderDestroy(dec);
 }
 
 std::vector<uint8_t> GetIccTestHeader(const jxl::IccBytes& icc_profile,
                                       bool xyb_encoded) {
   size_t xsize = 50;
   size_t ysize = 50;
   size_t bits_per_sample = 16;
   size_t orientation = 1;
   size_t alpha_bits = 0;
   return GetTestHeader(xsize, ysize, bits_per_sample, orientation, alpha_bits,
                        xyb_encoded,
                        /*have_container=*/false, /*metadata_default=*/false,
                        /*insert_extra_box=*/false, icc_profile);
 }
 
 // Tests the case where pixels and metadata ICC profile are the same
 TEST(DecodeTest, IccProfileTestOriginal) {
   jxl::IccBytes icc_profile = GetIccTestProfile();
   bool xyb_encoded = false;
   std::vector<uint8_t> data = GetIccTestHeader(icc_profile, xyb_encoded);
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), data.size()));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
 
   // Expect the opposite of xyb_encoded for uses_original_profile
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(JXL_TRUE, info.uses_original_profile);
 
   EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
 
   // the encoded color profile expected to be not available, since the image
   // has an ICC profile instead
   EXPECT_EQ(JXL_DEC_ERROR,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL, nullptr));
 
   size_t dec_profile_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                         &dec_profile_size));
 
   // Check that can get return status with NULL size
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                         nullptr));
 
   // The profiles must be equal. This requires they have equal size, and if
   // they do, we can get the profile and compare the contents.
   EXPECT_EQ(icc_profile.size(), dec_profile_size);
   if (icc_profile.size() == dec_profile_size) {
     jxl::IccBytes icc_profile2(icc_profile.size());
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetColorAsICCProfile(
                                    dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                    icc_profile2.data(), icc_profile2.size()));
     EXPECT_EQ(icc_profile, icc_profile2);
   }
 
   // the data is not xyb_encoded, so same result expected for the pixel data
   // color profile
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderGetColorAsEncodedProfile(
                                dec, JXL_COLOR_PROFILE_TARGET_DATA, nullptr));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                         &dec_profile_size));
   EXPECT_EQ(icc_profile.size(), dec_profile_size);
 
   JxlDecoderDestroy(dec);
 }
 
 // Tests the case where pixels and metadata ICC profile are different
 TEST(DecodeTest, IccProfileTestXybEncoded) {
   jxl::IccBytes icc_profile = GetIccTestProfile();
   bool xyb_encoded = true;
   std::vector<uint8_t> data = GetIccTestHeader(icc_profile, xyb_encoded);
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), data.size()));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
 
   // Expect the opposite of xyb_encoded for uses_original_profile
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(JXL_FALSE, info.uses_original_profile);
 
   EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
 
   // the encoded color profile expected to be not available, since the image
   // has an ICC profile instead
   EXPECT_EQ(JXL_DEC_ERROR,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL, nullptr));
 
   // Check that can get return status with NULL size
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                         nullptr));
 
   size_t dec_profile_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                         &dec_profile_size));
 
   // The profiles must be equal. This requires they have equal size, and if
   // they do, we can get the profile and compare the contents.
   EXPECT_EQ(icc_profile.size(), dec_profile_size);
   if (icc_profile.size() == dec_profile_size) {
     jxl::IccBytes icc_profile2(icc_profile.size());
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetColorAsICCProfile(
                                    dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL,
                                    icc_profile2.data(), icc_profile2.size()));
     EXPECT_EQ(icc_profile, icc_profile2);
   }
 
   // Data is xyb_encoded, so the data profile is a different profile, encoded
   // as structured profile.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetColorAsEncodedProfile(
                                  dec, JXL_COLOR_PROFILE_TARGET_DATA, nullptr));
   JxlColorEncoding pixel_encoding;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_DATA, &pixel_encoding));
   EXPECT_EQ(JXL_PRIMARIES_SRGB, pixel_encoding.primaries);
   // The API returns LINEAR by default when the colorspace cannot be represented
   // by enum values.
   EXPECT_EQ(JXL_TRANSFER_FUNCTION_LINEAR, pixel_encoding.transfer_function);
 
   // Test the same but with integer format.
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_DATA, &pixel_encoding));
   EXPECT_EQ(JXL_PRIMARIES_SRGB, pixel_encoding.primaries);
   EXPECT_EQ(JXL_TRANSFER_FUNCTION_LINEAR, pixel_encoding.transfer_function);
 
   // Test after setting the preferred color profile to non-linear sRGB:
   // for XYB images with ICC profile, this setting is expected to take effect.
   jxl::ColorEncoding temp_jxl_srgb = jxl::ColorEncoding::SRGB(false);
   JxlColorEncoding pixel_encoding_srgb = temp_jxl_srgb.ToExternal();
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetPreferredColorProfile(dec, &pixel_encoding_srgb));
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_DATA, &pixel_encoding));
   EXPECT_EQ(JXL_TRANSFER_FUNCTION_SRGB, pixel_encoding.transfer_function);
 
   // The decoder can also output this as a generated ICC profile anyway, and
   // we're certain that it will differ from the above defined profile since
   // the sRGB data should not have swapped R/G/B primaries.
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                         &dec_profile_size));
   // We don't need to dictate exactly what size the generated ICC profile
   // must be (since there are many ways to represent the same color space),
   // but it should not be zero.
   EXPECT_NE(0u, dec_profile_size);
   jxl::IccBytes icc_profile2(dec_profile_size);
   if (0 != dec_profile_size) {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetColorAsICCProfile(
                                    dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                    icc_profile2.data(), icc_profile2.size()));
     // expected not equal
     EXPECT_NE(icc_profile, icc_profile2);
   }
 
   // Test setting another different preferred profile, to verify that the
   // returned JXL_COLOR_PROFILE_TARGET_DATA ICC profile is correctly
   // updated.
 
   jxl::ColorEncoding temp_jxl_linear = jxl::ColorEncoding::LinearSRGB(false);
   JxlColorEncoding pixel_encoding_linear = temp_jxl_linear.ToExternal();
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetPreferredColorProfile(dec, &pixel_encoding_linear));
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(
                 dec, JXL_COLOR_PROFILE_TARGET_DATA, &pixel_encoding));
   EXPECT_EQ(JXL_TRANSFER_FUNCTION_LINEAR, pixel_encoding.transfer_function);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetICCProfileSize(dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                         &dec_profile_size));
   EXPECT_NE(0u, dec_profile_size);
   jxl::IccBytes icc_profile3(dec_profile_size);
   if (0 != dec_profile_size) {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetColorAsICCProfile(
                                    dec, JXL_COLOR_PROFILE_TARGET_DATA,
                                    icc_profile3.data(), icc_profile3.size()));
     // expected not equal to the previously set preferred profile.
     EXPECT_NE(icc_profile2, icc_profile3);
   }
 
   JxlDecoderDestroy(dec);
 }
 
 // Test decoding ICC from partial files byte for byte.
 // This test must pass also if JXL_CRASH_ON_ERROR is enabled, that is, the
 // decoding of the ANS histogram and stream of the encoded ICC profile must also
 // handle the case of not enough input bytes with StatusCode::kNotEnoughBytes
 // rather than fatal error status codes.
 TEST(DecodeTest, ICCPartialTest) {
   jxl::IccBytes icc_profile = GetIccTestProfile();
   std::vector<uint8_t> data = GetIccTestHeader(icc_profile, false);
 
   const uint8_t* next_in = data.data();
   size_t avail_in = 0;
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING));
 
   bool seen_basic_info = false;
   bool seen_color_encoding = false;
   size_t total_size = 0;
 
   for (;;) {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     JxlDecoderStatus status = JxlDecoderProcessInput(dec);
     size_t remaining = JxlDecoderReleaseInput(dec);
     EXPECT_LE(remaining, avail_in);
     next_in += avail_in - remaining;
     avail_in = remaining;
     if (status == JXL_DEC_NEED_MORE_INPUT) {
       if (total_size >= data.size()) {
         // End of partial codestream with codestrema headers and ICC profile
         // reached, it should not require more input since full image is not
         // requested
         FAIL();
         break;
       }
       size_t increment = 1;
       if (total_size + increment > data.size()) {
         increment = data.size() - total_size;
       }
       total_size += increment;
       avail_in += increment;
     } else if (status == JXL_DEC_BASIC_INFO) {
       EXPECT_FALSE(seen_basic_info);
       seen_basic_info = true;
     } else if (status == JXL_DEC_COLOR_ENCODING) {
       EXPECT_TRUE(seen_basic_info);
       EXPECT_FALSE(seen_color_encoding);
       seen_color_encoding = true;
 
       // Sanity check that the ICC profile was decoded correctly
       size_t dec_profile_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderGetICCProfileSize(
                     dec, JXL_COLOR_PROFILE_TARGET_ORIGINAL, &dec_profile_size));
       EXPECT_EQ(icc_profile.size(), dec_profile_size);
 
     } else if (status == JXL_DEC_SUCCESS) {
       EXPECT_TRUE(seen_color_encoding);
       break;
     } else {
       // We do not expect any other events or errors
       FAIL();
       break;
     }
   }
 
   EXPECT_TRUE(seen_basic_info);
   EXPECT_TRUE(seen_color_encoding);
 
   JxlDecoderDestroy(dec);
 }
 
 struct PixelTestConfig {
   // Input image definition.
   bool grayscale;
   bool include_alpha;
   size_t xsize;
   size_t ysize;
   jxl::PreviewMode preview_mode;
   bool add_intrinsic_size;
   // Output format.
   JxlEndianness endianness;
   JxlDataType data_type;
   uint32_t output_channels;
   // Container options.
   CodeStreamBoxFormat add_container;
   // Decoding mode.
   bool use_callback;
   bool set_buffer_early;
   bool use_resizable_runner;
   // Exif orientation, 1-8
   JxlOrientation orientation;
   bool keep_orientation;
   size_t upsampling;
 };
 
 class DecodeTestParam : public ::testing::TestWithParam<PixelTestConfig> {};
 
 TEST_P(DecodeTestParam, PixelTest) {
   PixelTestConfig config = GetParam();
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   if (config.keep_orientation) {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetKeepOrientation(dec, JXL_TRUE));
   }
 
   size_t num_pixels = config.xsize * config.ysize;
   uint32_t orig_channels =
       (config.grayscale ? 1 : 3) + (config.include_alpha ? 1 : 0);
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(config.xsize, config.ysize, orig_channels, 0);
   JxlPixelFormat format_orig = {orig_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN,
                                 0};
   jxl::TestCodestreamParams params;
   // Lossless to verify pixels exactly after roundtrip.
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   params.cparams.resampling = config.upsampling;
   params.cparams.ec_resampling = config.upsampling;
   params.box_format = config.add_container;
   params.orientation = config.orientation;
   params.preview_mode = config.preview_mode;
   params.add_intrinsic_size = config.add_intrinsic_size;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), config.xsize, config.ysize,
       orig_channels, params);
 
   JxlPixelFormat format = {config.output_channels, config.data_type,
                            config.endianness, 0};
 
   bool swap_xy = !config.keep_orientation && (config.orientation > 4);
   size_t xsize = swap_xy ? config.ysize : config.xsize;
   size_t ysize = swap_xy ? config.xsize : config.ysize;
 
   std::vector<uint8_t> pixels2 =
       jxl::DecodeWithAPI(dec, jxl::Bytes(compressed.data(), compressed.size()),
                          format, config.use_callback, config.set_buffer_early,
                          config.use_resizable_runner, /*require_boxes=*/false,
                          /*expect_success=*/true);
   JxlDecoderReset(dec);
   EXPECT_EQ(num_pixels * config.output_channels *
                 jxl::test::GetDataBits(config.data_type) / jxl::kBitsPerByte,
             pixels2.size());
 
   // If an orientation transformation is expected, to compare the pixels, also
   // apply this transformation to the original pixels. ConvertToExternal is
   // used to achieve this, with a temporary conversion to CodecInOut and back.
   if (config.orientation > 1 && !config.keep_orientation) {
     jxl::Span<const uint8_t> bytes(pixels.data(), pixels.size());
     jxl::ColorEncoding color_encoding =
         jxl::ColorEncoding::SRGB(config.grayscale);
 
     jxl::CodecInOut io;
     if (config.include_alpha) io.metadata.m.SetAlphaBits(16);
     io.metadata.m.color_encoding = color_encoding;
     io.SetSize(config.xsize, config.ysize);
 
     EXPECT_TRUE(ConvertFromExternal(bytes, config.xsize, config.ysize,
                                     color_encoding, 16, format_orig, nullptr,
                                     &io.Main()));
 
     for (uint8_t& pixel : pixels) pixel = 0;
     EXPECT_TRUE(ConvertToExternal(
         io.Main(), 16,
         /*float_out=*/false, orig_channels, JXL_BIG_ENDIAN,
         xsize * 2 * orig_channels, nullptr, pixels.data(), pixels.size(),
         /*out_callback=*/{},
         static_cast<jxl::Orientation>(config.orientation)));
   }
   if (config.upsampling == 1) {
     EXPECT_EQ(0u, jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                            ysize, format_orig, format));
   } else {
     // resampling is of course not lossless, so as a rough check:
     // count pixels that are more than off-by-25 in the 8-bit value of one of
     // the channels
     EXPECT_LE(
         jxl::test::ComparePixels(
             pixels.data(), pixels2.data(), xsize, ysize, format_orig, format,
             50.0 * (config.data_type == JXL_TYPE_UINT8 ? 1.0 : 256.0)),
         300u);
   }
 
   JxlDecoderDestroy(dec);
 }
 
 std::vector<PixelTestConfig> GeneratePixelTests() {
   std::vector<PixelTestConfig> all_tests;
   struct ChannelInfo {
     bool grayscale;
     bool include_alpha;
     size_t output_channels;
   };
   ChannelInfo ch_info[] = {
       {false, true, 4},   // RGBA -> RGBA
       {true, false, 1},   // G -> G
       {true, true, 1},    // GA -> G
       {true, true, 2},    // GA -> GA
       {false, false, 3},  // RGB -> RGB
       {false, true, 3},   // RGBA -> RGB
       {false, false, 4},  // RGB -> RGBA
   };
 
   struct OutputFormat {
     JxlEndianness endianness;
     JxlDataType data_type;
   };
   OutputFormat out_formats[] = {
       {JXL_NATIVE_ENDIAN, JXL_TYPE_UINT8},
       {JXL_LITTLE_ENDIAN, JXL_TYPE_UINT16},
       {JXL_BIG_ENDIAN, JXL_TYPE_UINT16},
       {JXL_NATIVE_ENDIAN, JXL_TYPE_FLOAT16},
       {JXL_LITTLE_ENDIAN, JXL_TYPE_FLOAT},
       {JXL_BIG_ENDIAN, JXL_TYPE_FLOAT},
   };
 
   auto make_test = [&](ChannelInfo ch, size_t xsize, size_t ysize,
                        jxl::PreviewMode preview_mode, bool intrinsic_size,
                        CodeStreamBoxFormat box, JxlOrientation orientation,
                        bool keep_orientation, OutputFormat format,
                        bool use_callback, bool set_buffer_early,
                        bool resizable_runner, size_t upsampling) {
     PixelTestConfig c;
     c.grayscale = ch.grayscale;
     c.include_alpha = ch.include_alpha;
     c.preview_mode = preview_mode;
     c.add_intrinsic_size = intrinsic_size;
     c.xsize = xsize;
     c.ysize = ysize;
     c.add_container = box;
     c.output_channels = ch.output_channels;
     c.data_type = format.data_type;
     c.endianness = format.endianness;
     c.use_callback = use_callback;
     c.set_buffer_early = set_buffer_early;
     c.use_resizable_runner = resizable_runner;
     c.orientation = orientation;
     c.keep_orientation = keep_orientation;
     c.upsampling = upsampling;
     all_tests.push_back(c);
   };
 
   // Test output formats and methods.
   for (ChannelInfo ch : ch_info) {
     for (bool use_callback : {false, true}) {
       for (size_t upsampling : {1, 2, 4, 8}) {
         for (OutputFormat fmt : out_formats) {
           make_test(ch, 301, 33, jxl::kNoPreview,
                     /*add_intrinsic_size=*/false,
                     CodeStreamBoxFormat::kCSBF_None, JXL_ORIENT_IDENTITY,
                     /*keep_orientation=*/false, fmt, use_callback,
                     /*set_buffer_early=*/false, /*resizable_runner=*/false,
                     upsampling);
         }
       }
     }
   }
   // Test codestream formats.
   for (size_t box = 1; box < kCSBF_NUM_ENTRIES; ++box) {
     make_test(ch_info[0], 77, 33, jxl::kNoPreview,
               /*add_intrinsic_size=*/false,
               static_cast<CodeStreamBoxFormat>(box), JXL_ORIENT_IDENTITY,
               /*keep_orientation=*/false, out_formats[0],
               /*use_callback=*/false,
               /*set_buffer_early=*/false, /*resizable_runner=*/false, 1);
   }
   // Test previews.
   for (int preview_mode = 0; preview_mode < jxl::kNumPreviewModes;
        preview_mode++) {
     make_test(ch_info[0], 77, 33, static_cast<jxl::PreviewMode>(preview_mode),
               /*add_intrinsic_size=*/false, CodeStreamBoxFormat::kCSBF_None,
               JXL_ORIENT_IDENTITY,
               /*keep_orientation=*/false, out_formats[0],
               /*use_callback=*/false, /*set_buffer_early=*/false,
               /*resizable_runner=*/false, 1);
   }
   // Test intrinsic sizes.
   for (bool add_intrinsic_size : {false, true}) {
     make_test(ch_info[0], 55, 34, jxl::kNoPreview, add_intrinsic_size,
               CodeStreamBoxFormat::kCSBF_None, JXL_ORIENT_IDENTITY,
               /*keep_orientation=*/false, out_formats[0],
               /*use_callback=*/false, /*set_buffer_early=*/false,
               /*resizable_runner=*/false, 1);
   }
   // Test setting buffers early.
   make_test(ch_info[0], 300, 33, jxl::kNoPreview,
             /*add_intrinsic_size=*/false, CodeStreamBoxFormat::kCSBF_None,
             JXL_ORIENT_IDENTITY,
             /*keep_orientation=*/false, out_formats[0],
             /*use_callback=*/false, /*set_buffer_early=*/true,
             /*resizable_runner=*/false, 1);
 
   // Test using the resizable runner
   for (size_t i = 0; i < 4; i++) {
     make_test(ch_info[0], 300 << i, 33 << i, jxl::kNoPreview,
               /*add_intrinsic_size=*/false, CodeStreamBoxFormat::kCSBF_None,
               JXL_ORIENT_IDENTITY,
               /*keep_orientation=*/false, out_formats[0],
               /*use_callback=*/false, /*set_buffer_early=*/false,
               /*resizable_runner=*/true, 1);
   }
 
   // Test orientations.
   for (int orientation = 2; orientation <= 8; ++orientation) {
     for (bool keep_orientation : {false, true}) {
       for (bool use_callback : {false, true}) {
         for (ChannelInfo ch : ch_info) {
           for (OutputFormat fmt : out_formats) {
             make_test(ch, 280, 12, jxl::kNoPreview,
                       /*add_intrinsic_size=*/false,
                       CodeStreamBoxFormat::kCSBF_None,
                       static_cast<JxlOrientation>(orientation),
                       /*keep_orientation=*/keep_orientation, fmt,
                       /*use_callback=*/use_callback, /*set_buffer_early=*/true,
                       /*resizable_runner=*/false, 1);
           }
         }
       }
     }
   }
 
   return all_tests;
 }
 
 std::ostream& operator<<(std::ostream& os, const PixelTestConfig& c) {
   os << c.xsize << "x" << c.ysize;
   const char* colors[] = {"", "G", "GA", "RGB", "RGBA"};
   os << colors[(c.grayscale ? 1 : 3) + (c.include_alpha ? 1 : 0)];
   os << "to";
   os << colors[c.output_channels];
   switch (c.data_type) {
     case JXL_TYPE_UINT8:
       os << "u8";
       break;
     case JXL_TYPE_UINT16:
       os << "u16";
       break;
     case JXL_TYPE_FLOAT:
       os << "f32";
       break;
     case JXL_TYPE_FLOAT16:
       os << "f16";
       break;
     default:
       JXL_ASSERT(false);
   };
   if (jxl::test::GetDataBits(c.data_type) > jxl::kBitsPerByte) {
     if (c.endianness == JXL_NATIVE_ENDIAN) {
       // add nothing
     } else if (c.endianness == JXL_BIG_ENDIAN) {
       os << "BE";
     } else if (c.endianness == JXL_LITTLE_ENDIAN) {
       os << "LE";
     }
   }
   if (c.add_container != CodeStreamBoxFormat::kCSBF_None) {
     os << "Box";
     os << static_cast<size_t>(c.add_container);
   }
   if (c.preview_mode == jxl::kSmallPreview) os << "Preview";
   if (c.preview_mode == jxl::kBigPreview) os << "BigPreview";
   if (c.add_intrinsic_size) os << "IntrinicSize";
   if (c.use_callback) os << "Callback";
   if (c.set_buffer_early) os << "EarlyBuffer";
   if (c.use_resizable_runner) os << "ResizableRunner";
   if (c.orientation != 1) os << "O" << c.orientation;
   if (c.keep_orientation) os << "Keep";
   if (c.upsampling > 1) os << "x" << c.upsampling;
   return os;
 }
 
 std::string PixelTestDescription(
     const testing::TestParamInfo<DecodeTestParam::ParamType>& info) {
   std::stringstream name;
   name << info.param;
   return name.str();
 }
 
 JXL_GTEST_INSTANTIATE_TEST_SUITE_P(DecodeTest, DecodeTestParam,
                                    testing::ValuesIn(GeneratePixelTests()),
                                    PixelTestDescription);
 
 TEST(DecodeTest, PixelTestWithICCProfileLossless) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   size_t xsize = 123;
   size_t ysize = 77;
   size_t num_pixels = xsize * ysize;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   JxlPixelFormat format_orig = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   jxl::TestCodestreamParams params;
   // Lossless to verify pixels exactly after roundtrip.
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   params.add_icc_profile = true;
   // For variation: some have container and no preview, others have preview
   // and no container.
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   for (uint32_t channels = 3; channels <= 4; ++channels) {
     {
       JxlPixelFormat format = {channels, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
 
       std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
           dec, jxl::Bytes(compressed.data(), compressed.size()), format,
           /*use_callback=*/false, /*set_buffer_early=*/false,
           /*use_resizable_runner=*/false, /*require_boxes=*/false,
           /*expect_success=*/true);
       JxlDecoderReset(dec);
       EXPECT_EQ(num_pixels * channels, pixels2.size());
       EXPECT_EQ(0u,
                 jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                          ysize, format_orig, format));
     }
     {
       JxlPixelFormat format = {channels, JXL_TYPE_UINT16, JXL_LITTLE_ENDIAN, 0};
 
       // Test with the container for one of the pixel formats.
       std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
           dec, jxl::Bytes(compressed.data(), compressed.size()), format,
           /*use_callback=*/true, /*set_buffer_early=*/true,
           /*use_resizable_runner=*/false, /*require_boxes=*/false,
           /*expect_success=*/true);
       JxlDecoderReset(dec);
       EXPECT_EQ(num_pixels * channels * 2, pixels2.size());
       EXPECT_EQ(0u,
                 jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                          ysize, format_orig, format));
     }
 
     {
       JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
 
       std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
           dec, jxl::Bytes(compressed.data(), compressed.size()), format,
           /*use_callback=*/false, /*set_buffer_early=*/false,
           /*use_resizable_runner=*/false, /*require_boxes=*/false,
           /*expect_success=*/true);
       JxlDecoderReset(dec);
       EXPECT_EQ(num_pixels * channels * 4, pixels2.size());
       EXPECT_EQ(0u,
                 jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                          ysize, format_orig, format));
     }
   }
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, PixelTestWithICCProfileLossy) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   size_t xsize = 123;
   size_t ysize = 77;
   size_t num_pixels = xsize * ysize;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   JxlPixelFormat format_orig = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   jxl::TestCodestreamParams params;
   params.add_icc_profile = true;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
   uint32_t channels = 3;
 
   JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
 
   std::vector<uint8_t> icc_data;
   std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
       dec, jxl::Bytes(compressed.data(), compressed.size()), format,
       /*use_callback=*/false, /*set_buffer_early=*/true,
       /*use_resizable_runner=*/false, /*require_boxes=*/false,
       /*expect_success=*/true, /*icc=*/&icc_data);
   JxlDecoderReset(dec);
   EXPECT_EQ(num_pixels * channels * 4, pixels2.size());
 
   // The input pixels use the profile matching GetIccTestProfile, since we set
   // add_icc_profile for CreateTestJXLCodestream to true.
   jxl::ColorEncoding color_encoding0;
   EXPECT_TRUE(color_encoding0.SetICC(GetIccTestProfile(), JxlGetDefaultCms()));
   jxl::Span<const uint8_t> span0(pixels.data(), pixels.size());
   jxl::CodecInOut io0;
   io0.SetSize(xsize, ysize);
   EXPECT_TRUE(ConvertFromExternal(span0, xsize, ysize, color_encoding0,
                                   /*bits_per_sample=*/16, format_orig,
                                   /*pool=*/nullptr, &io0.Main()));
 
   jxl::ColorEncoding color_encoding1;
   jxl::IccBytes icc;
   jxl::Bytes(icc_data).AppendTo(icc);
   EXPECT_TRUE(color_encoding1.SetICC(std::move(icc), JxlGetDefaultCms()));
   jxl::Span<const uint8_t> span1(pixels2.data(), pixels2.size());
   jxl::CodecInOut io1;
   io1.SetSize(xsize, ysize);
   EXPECT_TRUE(ConvertFromExternal(span1, xsize, ysize, color_encoding1,
                                   /*bits_per_sample=*/32, format,
                                   /*pool=*/nullptr, &io1.Main()));
 
   jxl::ButteraugliParams ba;
   EXPECT_THAT(
       ButteraugliDistance(io0.frames, io1.frames, ba, *JxlGetDefaultCms(),
                           /*distmap=*/nullptr, nullptr),
       IsSlightlyBelow(0.56f));
 
   JxlDecoderDestroy(dec);
 }
 
 std::string ColorDescription(JxlColorEncoding c) {
   jxl::ColorEncoding color_encoding;
   EXPECT_TRUE(color_encoding.FromExternal(c));
   return Description(color_encoding);
 }
 
 std::string GetOrigProfile(JxlDecoder* dec) {
   JxlColorEncoding c;
   JxlColorProfileTarget target = JXL_COLOR_PROFILE_TARGET_ORIGINAL;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(dec, target, &c));
   return ColorDescription(c);
 }
 
 std::string GetDataProfile(JxlDecoder* dec) {
   JxlColorEncoding c;
   JxlColorProfileTarget target = JXL_COLOR_PROFILE_TARGET_DATA;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetColorAsEncodedProfile(dec, target, &c));
   return ColorDescription(c);
 }
 
 double ButteraugliDistance(size_t xsize, size_t ysize,
                            const std::vector<uint8_t>& pixels_in,
                            const jxl::ColorEncoding& color_in,
                            float intensity_in,
                            const std::vector<uint8_t>& pixels_out,
                            const jxl::ColorEncoding& color_out,
                            float intensity_out) {
   jxl::CodecInOut in;
   in.metadata.m.color_encoding = color_in;
   in.metadata.m.SetIntensityTarget(intensity_in);
   JxlPixelFormat format_in = {static_cast<uint32_t>(color_in.Channels()),
                               JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   EXPECT_TRUE(jxl::ConvertFromExternal(
       jxl::Bytes(pixels_in.data(), pixels_in.size()), xsize, ysize, color_in,
       /*bits_per_sample=*/16, format_in,
       /*pool=*/nullptr, &in.Main()));
   jxl::CodecInOut out;
   out.metadata.m.color_encoding = color_out;
   out.metadata.m.SetIntensityTarget(intensity_out);
   JxlPixelFormat format_out = {static_cast<uint32_t>(color_out.Channels()),
                                JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   EXPECT_TRUE(jxl::ConvertFromExternal(
       jxl::Bytes(pixels_out.data(), pixels_out.size()), xsize, ysize, color_out,
       /*bits_per_sample=*/16, format_out,
       /*pool=*/nullptr, &out.Main()));
   return ButteraugliDistance(in.frames, out.frames, jxl::ButteraugliParams(),
                              *JxlGetDefaultCms(), nullptr, nullptr);
 }
 
 class DecodeAllEncodingsTest
     : public ::testing::TestWithParam<jxl::test::ColorEncodingDescriptor> {};
 JXL_GTEST_INSTANTIATE_TEST_SUITE_P(
     DecodeAllEncodingsTestInstantiation, DecodeAllEncodingsTest,
     ::testing::ValuesIn(jxl::test::AllEncodings()));
 TEST_P(DecodeAllEncodingsTest, PreserveOriginalProfileTest) {
   size_t xsize = 123;
   size_t ysize = 77;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   int events = JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE;
   const auto& cdesc = GetParam();
   jxl::ColorEncoding c_in = jxl::test::ColorEncodingFromDescriptor(cdesc);
   if (c_in.GetRenderingIntent() != jxl::RenderingIntent::kRelative) return;
   std::string color_space_in = Description(c_in);
   float intensity_in = c_in.Tf().IsPQ() ? 10000 : 255;
   printf("Testing input color space %s\n", color_space_in.c_str());
   jxl::TestCodestreamParams params;
   params.color_space = color_space_in;
   params.intensity_target = intensity_in;
   std::vector<uint8_t> data = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), data.size()));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(xsize, info.xsize);
   EXPECT_EQ(ysize, info.ysize);
   EXPECT_FALSE(info.uses_original_profile);
   EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
   EXPECT_EQ(GetOrigProfile(dec), color_space_in);
   EXPECT_EQ(GetDataProfile(dec), color_space_in);
   EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
   std::vector<uint8_t> out(pixels.size());
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetImageOutBuffer(dec, &format, out.data(), out.size()));
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   double dist = ButteraugliDistance(xsize, ysize, pixels, c_in, intensity_in,
                                     out, c_in, intensity_in);
   EXPECT_LT(dist, 1.29);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
   JxlDecoderDestroy(dec);
 }
 
 namespace {
 void SetPreferredColorProfileTest(
     const jxl::test::ColorEncodingDescriptor& from, bool icc_dst,
     bool use_cms) {
   size_t xsize = 123;
   size_t ysize = 77;
   int events = JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE;
   jxl::ColorEncoding c_in = jxl::test::ColorEncodingFromDescriptor(from);
   if (c_in.GetRenderingIntent() != jxl::RenderingIntent::kRelative) return;
   if (c_in.GetWhitePointType() != jxl::WhitePoint::kD65) return;
   uint32_t num_channels = c_in.Channels();
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
 
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   std::string color_space_in = Description(c_in);
   float intensity_in = c_in.Tf().IsPQ() ? 10000 : 255;
   jxl::TestCodestreamParams params;
   params.color_space = color_space_in;
   params.intensity_target = intensity_in;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   auto all_encodings = jxl::test::AllEncodings();
   // TODO(firsching): understand why XYB does not work together with icc_dst.
   if (!icc_dst) {
     all_encodings.push_back(
         {jxl::ColorSpace::kXYB, jxl::WhitePoint::kD65, jxl::Primaries::kCustom,
          jxl::TransferFunction::kUnknown, jxl::RenderingIntent::kPerceptual});
   }
   for (const auto& c1 : all_encodings) {
     jxl::ColorEncoding c_out = jxl::test::ColorEncodingFromDescriptor(c1);
     float intensity_out = intensity_in;
     if (c_out.GetColorSpace() != jxl::ColorSpace::kXYB) {
       if (c_out.GetRenderingIntent() != jxl::RenderingIntent::kRelative) {
         continue;
       }
       if ((c_in.GetPrimariesType() == jxl::Primaries::k2100 &&
            c_out.GetPrimariesType() != jxl::Primaries::k2100) ||
           (c_in.GetPrimariesType() == jxl::Primaries::kP3 &&
            c_out.GetPrimariesType() == jxl::Primaries::kSRGB)) {
         // Converting to a narrower gamut does not work without gamut mapping.
         continue;
       }
     }
     if (c_out.Tf().IsHLG() && intensity_out > 300) {
       // The Linear->HLG OOTF function at this intensity level can push
       // saturated colors out of gamut, so we would need gamut mapping in
       // this case too.
       continue;
     }
     std::string color_space_out = Description(c_out);
     if (color_space_in == color_space_out) continue;
     printf("Testing input color space %s with output color space %s\n",
            color_space_in.c_str(), color_space_out.c_str());
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetInput(dec, data.data(), data.size()));
     EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
     JxlBasicInfo info;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
     EXPECT_EQ(xsize, info.xsize);
     EXPECT_EQ(ysize, info.ysize);
     EXPECT_FALSE(info.uses_original_profile);
     EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
     EXPECT_EQ(GetOrigProfile(dec), color_space_in);
     JxlColorEncoding encoding_out;
     EXPECT_TRUE(jxl::ParseDescription(color_space_out, &encoding_out));
     if (c_out.GetColorSpace() == jxl::ColorSpace::kXYB &&
         (c_in.GetPrimariesType() != jxl::Primaries::kSRGB ||
          c_in.Tf().IsPQ())) {
       EXPECT_EQ(JXL_DEC_ERROR,
                 JxlDecoderSetPreferredColorProfile(dec, &encoding_out));
       JxlDecoderDestroy(dec);
       continue;
     }
     if (use_cms) {
       JxlDecoderSetCms(dec, *JxlGetDefaultCms());
     }
     if (icc_dst) {
       jxl::ColorEncoding internal_encoding_out;
       EXPECT_TRUE(internal_encoding_out.FromExternal(encoding_out));
       EXPECT_TRUE(internal_encoding_out.CreateICC());
       std::vector<uint8_t> rewritten_icc = internal_encoding_out.ICC();
 
       EXPECT_EQ(use_cms ? JXL_DEC_SUCCESS : JXL_DEC_ERROR,
                 JxlDecoderSetOutputColorProfile(
                     dec, nullptr, rewritten_icc.data(), rewritten_icc.size()));
       if (!use_cms) {
         // continue if we don't have a cms here
         JxlDecoderDestroy(dec);
         continue;
       }
     } else {
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetPreferredColorProfile(dec, &encoding_out));
     }
     EXPECT_EQ(GetOrigProfile(dec), color_space_in);
     if (icc_dst) {
     } else {
       EXPECT_EQ(GetDataProfile(dec), color_space_out);
     }
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
     size_t buffer_size;
     JxlPixelFormat out_format = format;
     out_format.num_channels = c_out.Channels();
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderImageOutBufferSize(dec, &out_format, &buffer_size));
     std::vector<uint8_t> out(buffer_size);
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &out_format, out.data(), out.size()));
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     double dist = ButteraugliDistance(xsize, ysize, pixels, c_in, intensity_in,
                                       out, c_out, intensity_out);
 
     if (c_in.GetWhitePointType() == c_out.GetWhitePointType()) {
       EXPECT_LT(dist, 1.29);
     } else {
       EXPECT_LT(dist, 4.0);
     }
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
     JxlDecoderDestroy(dec);
   }
 }
 }  // namespace
 
 TEST(DecodeTest, SetPreferredColorProfileTestFromGray) {
   jxl::test::ColorEncodingDescriptor gray = {
       jxl::ColorSpace::kGray, jxl::WhitePoint::kD65, jxl::Primaries::kSRGB,
       jxl::TransferFunction::kSRGB, jxl::RenderingIntent::kRelative};
   SetPreferredColorProfileTest(gray, true, true);
   SetPreferredColorProfileTest(gray, false, true);
   SetPreferredColorProfileTest(gray, true, false);
   SetPreferredColorProfileTest(gray, false, false);
 }
 
 static std::string DecodeAllEncodingsVariantsTestName(
     const ::testing::TestParamInfo<
         std::tuple<jxl::test::ColorEncodingDescriptor, bool, bool>>& info) {
   const auto& encoding = std::get<0>(info.param);
   bool icc_dst = std::get<1>(info.param);
   bool use_cms = std::get<2>(info.param);
 
   std::string encoding_name =
       Description(ColorEncodingFromDescriptor(encoding));
 
   return "From_" + encoding_name +
          (icc_dst ? "_with_icc_dst" : "_without_icc_dst") +
          (use_cms ? "_with_cms" : "_without_cms");
 }
 
 class DecodeAllEncodingsVariantsTest
     : public ::testing::TestWithParam<
           std::tuple<jxl::test::ColorEncodingDescriptor, bool, bool>> {};
 JXL_GTEST_INSTANTIATE_TEST_SUITE_P(
     DecodeAllEncodingsVariantsTestInstantiation, DecodeAllEncodingsVariantsTest,
     ::testing::Combine(::testing::ValuesIn(jxl::test::AllEncodings()),
                        ::testing::Bool(), ::testing::Bool()),
     DecodeAllEncodingsVariantsTestName);
 TEST_P(DecodeAllEncodingsVariantsTest, SetPreferredColorProfileTest) {
   const auto& from = std::get<0>(GetParam());
   bool icc_dst = std::get<1>(GetParam());
   bool use_cms = std::get<2>(GetParam());
   SetPreferredColorProfileTest(from, icc_dst, use_cms);
 }
 
 void DecodeImageWithColorEncoding(const std::vector<uint8_t>& compressed,
                                   jxl::ColorEncoding& color_encoding,
                                   bool with_cms, std::vector<uint8_t>& out,
                                   JxlBasicInfo& info) {
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   int events = JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_FULL_IMAGE;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events));
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
   // TODO(eustas): why unused?
   std::string color_space_in = GetOrigProfile(dec);
   if (with_cms) {
     JxlDecoderSetCms(dec, *JxlGetDefaultCms());
     EXPECT_TRUE(color_encoding.CreateICC());
     std::vector<uint8_t> rewritten_icc = color_encoding.ICC();
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetOutputColorProfile(
                   dec, nullptr, rewritten_icc.data(), rewritten_icc.size()));
   } else {
     JxlColorEncoding external_color_encoding = color_encoding.ToExternal();
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetOutputColorProfile(
                                    dec, &external_color_encoding, nullptr, 0));
   }
   EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
   size_t buffer_size;
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   JxlPixelFormat out_format = format;
   out_format.num_channels = color_encoding.Channels();
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &out_format, &buffer_size));
   out.resize(buffer_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &out_format, out.data(), out.size()));
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   JxlDecoderDestroy(dec);
 }
 
 class DecodeAllEncodingsWithCMSTest
     : public ::testing::TestWithParam<jxl::test::ColorEncodingDescriptor> {};
 
 JXL_GTEST_INSTANTIATE_TEST_SUITE_P(
     AllEncodings, DecodeAllEncodingsWithCMSTest,
     testing::ValuesIn(jxl::test::AllEncodings()));
 
 TEST_P(DecodeAllEncodingsWithCMSTest, DecodeWithCMS) {
   auto all_encodings = jxl::test::AllEncodings();
   uint32_t num_channels = 3;
   size_t xsize = 177;
   size_t ysize = 123;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
 
   jxl::ColorEncoding color_encoding =
       jxl::test::ColorEncodingFromDescriptor(GetParam());
   fprintf(stderr, "color_description: %s\n",
           Description(color_encoding).c_str());
 
   std::vector<uint8_t> out_with_cms;
   JxlBasicInfo info_with_cms;
   DecodeImageWithColorEncoding(data, color_encoding, true, out_with_cms,
                                info_with_cms);
 
   std::vector<uint8_t> out_without_cms;
   JxlBasicInfo info_without_cms;
   DecodeImageWithColorEncoding(data, color_encoding, false, out_without_cms,
                                info_without_cms);
 
   EXPECT_EQ(info_with_cms.xsize, info_without_cms.xsize);
   EXPECT_EQ(info_with_cms.ysize, info_without_cms.ysize);
   EXPECT_EQ(out_with_cms.size(), out_without_cms.size());
   double dist = ButteraugliDistance(xsize, ysize, out_with_cms, color_encoding,
                                     255, out_without_cms, color_encoding, 255);
 
   EXPECT_LT(dist, .1);
 }
 
 // Tests the case of lossy sRGB image without alpha channel, decoded to RGB8
 // and to RGBA8
 TEST(DecodeTest, PixelTestOpaqueSrgbLossy) {
   for (unsigned channels = 3; channels <= 4; channels++) {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     size_t xsize = 123;
     size_t ysize = 77;
     size_t num_pixels = xsize * ysize;
     std::vector<uint8_t> pixels =
         jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
     JxlPixelFormat format_orig = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3,
         jxl::TestCodestreamParams());
 
     JxlPixelFormat format = {channels, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
 
     std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
         dec, jxl::Bytes(compressed.data(), compressed.size()), format,
         /*use_callback=*/true, /*set_buffer_early=*/false,
         /*use_resizable_runner=*/false, /*require_boxes=*/false,
         /*expect_success*/ true);
     JxlDecoderReset(dec);
     EXPECT_EQ(num_pixels * channels, pixels2.size());
 
     jxl::ColorEncoding color_encoding0 = jxl::ColorEncoding::SRGB(false);
     jxl::Span<const uint8_t> span0(pixels.data(), pixels.size());
     jxl::CodecInOut io0;
     io0.SetSize(xsize, ysize);
     EXPECT_TRUE(ConvertFromExternal(span0, xsize, ysize, color_encoding0,
                                     /*bits_per_sample=*/16, format_orig,
                                     /*pool=*/nullptr, &io0.Main()));
 
     jxl::ColorEncoding color_encoding1 = jxl::ColorEncoding::SRGB(false);
     jxl::Span<const uint8_t> span1(pixels2.data(), pixels2.size());
     jxl::CodecInOut io1;
     EXPECT_TRUE(ConvertFromExternal(span1, xsize, ysize, color_encoding1,
                                     /*bits_per_sample=*/8, format,
                                     /*pool=*/nullptr, &io1.Main()));
 
     jxl::ButteraugliParams ba;
     EXPECT_THAT(
         ButteraugliDistance(io0.frames, io1.frames, ba, *JxlGetDefaultCms(),
                             /*distmap=*/nullptr, nullptr),
         IsSlightlyBelow(0.65f));
 
     JxlDecoderDestroy(dec);
   }
 }
 
 // Opaque image with noise enabled, decoded to RGB8 and RGBA8.
 TEST(DecodeTest, PixelTestOpaqueSrgbLossyNoise) {
   for (unsigned channels = 3; channels <= 4; channels++) {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     size_t xsize = 512;
     size_t ysize = 300;
     size_t num_pixels = xsize * ysize;
     std::vector<uint8_t> pixels =
         jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
     JxlPixelFormat format_orig = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     jxl::TestCodestreamParams params;
     params.cparams.noise = jxl::Override::kOn;
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
 
     JxlPixelFormat format = {channels, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
 
     std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
         dec, jxl::Bytes(compressed.data(), compressed.size()), format,
         /*use_callback=*/false, /*set_buffer_early=*/true,
         /*use_resizable_runner=*/false, /*require_boxes=*/false,
         /*expect_success=*/true);
     JxlDecoderReset(dec);
     EXPECT_EQ(num_pixels * channels, pixels2.size());
 
     jxl::ColorEncoding color_encoding0 = jxl::ColorEncoding::SRGB(false);
     jxl::Span<const uint8_t> span0(pixels.data(), pixels.size());
     jxl::CodecInOut io0;
     io0.SetSize(xsize, ysize);
     EXPECT_TRUE(ConvertFromExternal(span0, xsize, ysize, color_encoding0,
                                     /*bits_per_sample=*/16, format_orig,
                                     /*pool=*/nullptr, &io0.Main()));
 
     jxl::ColorEncoding color_encoding1 = jxl::ColorEncoding::SRGB(false);
     jxl::Span<const uint8_t> span1(pixels2.data(), pixels2.size());
     jxl::CodecInOut io1;
     EXPECT_TRUE(ConvertFromExternal(span1, xsize, ysize, color_encoding1,
                                     /*bits_per_sample=*/8, format,
                                     /*pool=*/nullptr, &io1.Main()));
 
     jxl::ButteraugliParams ba;
     EXPECT_THAT(
         ButteraugliDistance(io0.frames, io1.frames, ba, *JxlGetDefaultCms(),
                             /*distmap=*/nullptr, nullptr),
         IsSlightlyBelow(1.3f));
 
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, ProcessEmptyInputWithBoxes) {
   size_t xsize = 123;
   size_t ysize = 77;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   jxl::CompressParams cparams;
   uint32_t channels = 3;
   JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     jxl::TestCodestreamParams params;
     params.box_format = static_cast<CodeStreamBoxFormat>(i);
     printf("Testing empty input with box format %d\n",
            static_cast<int>(params.box_format));
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
     const int events =
         JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE | JXL_DEC_COLOR_ENCODING;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events));
     EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
     EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
     size_t buffer_size;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
     JxlBasicInfo info;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
     const size_t remaining = JxlDecoderReleaseInput(dec);
     EXPECT_LE(remaining, compressed.size());
     EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, ExtraBytesAfterCompressedStream) {
   size_t xsize = 123;
   size_t ysize = 77;
   size_t num_pixels = xsize * ysize;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   jxl::CompressParams cparams;
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     CodeStreamBoxFormat box_format = static_cast<CodeStreamBoxFormat>(i);
     if (box_format == kCSBF_Multi_Other_Zero_Terminated) continue;
     printf("Testing with box format %d\n", static_cast<int>(box_format));
     size_t last_unknown_box_size = 0;
     if (box_format == kCSBF_Single_Other) {
       last_unknown_box_size = unk1_box_size + 8;
     } else if (box_format == kCSBF_Multi_Other_Terminated) {
       last_unknown_box_size = unk3_box_size + 8;
     } else if (box_format == kCSBF_Multi_Last_Empty_Other) {
       // If boxes are not required, the decoder won't consume the last empty
       // jxlp box.
       last_unknown_box_size = 12 + unk3_box_size + 8;
     }
     jxl::TestCodestreamParams params;
     params.box_format = box_format;
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
     // Add some more bytes after compressed data.
     compressed.push_back(0);
     compressed.push_back(1);
     compressed.push_back(2);
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     uint32_t channels = 3;
     JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
     std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
         dec, jxl::Bytes(compressed.data(), compressed.size()), format,
         /*use_callback=*/false, /*set_buffer_early=*/true,
         /*use_resizable_runner=*/false, /*require_boxes=*/false,
         /*expect_success=*/true);
     size_t unconsumed_bytes = JxlDecoderReleaseInput(dec);
     EXPECT_EQ(last_unknown_box_size + 3, unconsumed_bytes);
     EXPECT_EQ(num_pixels * channels * 4, pixels2.size());
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, ExtraBytesAfterCompressedStreamRequireBoxes) {
   size_t xsize = 123;
   size_t ysize = 77;
   size_t num_pixels = xsize * ysize;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   jxl::CompressParams cparams;
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     CodeStreamBoxFormat box_format = static_cast<CodeStreamBoxFormat>(i);
     if (box_format == kCSBF_Multi_Other_Zero_Terminated) continue;
     printf("Testing with box format %d\n", static_cast<int>(box_format));
     bool expect_success = (box_format == kCSBF_None ||
                            box_format == kCSBF_Single_Zero_Terminated ||
                            box_format == kCSBF_Multi_Zero_Terminated);
     jxl::TestCodestreamParams params;
     params.box_format = box_format;
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
     // Add some more bytes after compressed data.
     compressed.push_back(0);
     compressed.push_back(1);
     compressed.push_back(2);
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     uint32_t channels = 3;
     JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
     std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
         dec, jxl::Bytes(compressed.data(), compressed.size()), format,
         /*use_callback=*/false, /*set_buffer_early=*/true,
         /*use_resizable_runner=*/false, /*require_boxes=*/true, expect_success);
     size_t unconsumed_bytes = JxlDecoderReleaseInput(dec);
     EXPECT_EQ(3, unconsumed_bytes);
     EXPECT_EQ(num_pixels * channels * 4, pixels2.size());
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, ConcatenatedCompressedStreams) {
   size_t xsize = 123;
   size_t ysize = 77;
   size_t num_pixels = xsize * ysize;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   jxl::CompressParams cparams;
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     CodeStreamBoxFormat first_box_format = static_cast<CodeStreamBoxFormat>(i);
     if (first_box_format == kCSBF_Multi_Other_Zero_Terminated) continue;
     jxl::TestCodestreamParams params1;
     params1.box_format = first_box_format;
     std::vector<uint8_t> compressed1 = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params1);
     for (int j = 0; j < kCSBF_NUM_ENTRIES; ++j) {
       CodeStreamBoxFormat second_box_format =
           static_cast<CodeStreamBoxFormat>(j);
       if (second_box_format == kCSBF_Multi_Other_Zero_Terminated) continue;
       printf("Testing with box format pair %d, %d\n",
              static_cast<int>(first_box_format),
              static_cast<int>(second_box_format));
       jxl::TestCodestreamParams params2;
       params2.box_format = second_box_format;
       std::vector<uint8_t> compressed2 = jxl::CreateTestJXLCodestream(
           jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params2);
       std::vector<uint8_t> concat;
       jxl::Bytes(compressed1).AppendTo(concat);
       jxl::Bytes(compressed2).AppendTo(concat);
       uint32_t channels = 3;
       JxlPixelFormat format = {channels, JXL_TYPE_FLOAT, JXL_LITTLE_ENDIAN, 0};
       size_t remaining = concat.size();
       for (int part = 0; part < 2; ++part) {
         printf("  Decoding part %d\n", part + 1);
         JxlDecoder* dec = JxlDecoderCreate(nullptr);
         size_t pos = concat.size() - remaining;
         bool expect_success =
             (part == 0 || second_box_format == kCSBF_None ||
              second_box_format == kCSBF_Single_Zero_Terminated ||
              second_box_format == kCSBF_Multi_Zero_Terminated);
         std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
             dec, jxl::Bytes(concat.data() + pos, remaining), format,
             /*use_callback=*/false, /*set_buffer_early=*/true,
             /*use_resizable_runner=*/false, /*require_boxes=*/true,
             expect_success);
         EXPECT_EQ(num_pixels * channels * 4, pixels2.size());
         remaining = JxlDecoderReleaseInput(dec);
         JxlDecoderDestroy(dec);
       }
       EXPECT_EQ(0, remaining);
     }
   }
 }
 
 void TestPartialStream(bool reconstructible_jpeg) {
   size_t xsize = 123;
   size_t ysize = 77;
   uint32_t channels = 4;
   if (reconstructible_jpeg) {
     channels = 3;
   }
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, channels, 0);
   JxlPixelFormat format_orig = {channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   jxl::TestCodestreamParams params;
   if (reconstructible_jpeg) {
     params.cparams.color_transform = jxl::ColorTransform::kNone;
   } else {
     // Lossless to verify pixels exactly after roundtrip.
     params.cparams.SetLossless();
   }
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   std::vector<uint8_t> jpeg_output(64);
   size_t used_jpeg_output = 0;
 
   std::vector<std::vector<uint8_t>> codestreams(kCSBF_NUM_ENTRIES);
   std::vector<std::vector<uint8_t>> jpeg_codestreams(kCSBF_NUM_ENTRIES);
   for (size_t i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     params.box_format = static_cast<CodeStreamBoxFormat>(i);
     if (reconstructible_jpeg) {
       params.jpeg_codestream = &jpeg_codestreams[i];
     }
     codestreams[i] =
         jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                      xsize, ysize, channels, params);
   }
 
   // Test multiple step sizes, to test different combinations of the streaming
   // box parsing.
   std::vector<size_t> increments = {1, 3, 17, 23, 120, 700, 1050};
 
   for (size_t increment : increments) {
     for (size_t i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
       if (reconstructible_jpeg && static_cast<CodeStreamBoxFormat>(i) ==
                                       CodeStreamBoxFormat::kCSBF_None) {
         continue;
       }
       const std::vector<uint8_t>& data = codestreams[i];
       const uint8_t* next_in = data.data();
       size_t avail_in = 0;
 
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSubscribeEvents(
                     dec, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE |
                              JXL_DEC_JPEG_RECONSTRUCTION));
 
       bool seen_basic_info = false;
       bool seen_full_image = false;
       bool seen_jpeg_recon = false;
 
       size_t total_size = 0;
 
       for (;;) {
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
         JxlDecoderStatus status = JxlDecoderProcessInput(dec);
         size_t remaining = JxlDecoderReleaseInput(dec);
         EXPECT_LE(remaining, avail_in);
         next_in += avail_in - remaining;
         avail_in = remaining;
         if (status == JXL_DEC_NEED_MORE_INPUT) {
           if (total_size >= data.size()) {
             // End of test data reached, it should have successfully decoded the
             // image now.
             FAIL();
             break;
           }
 
           // End of the file reached, should be the final test.
           if (total_size + increment > data.size()) {
             increment = data.size() - total_size;
           }
           total_size += increment;
           avail_in += increment;
         } else if (status == JXL_DEC_BASIC_INFO) {
           // This event should happen exactly once
           EXPECT_FALSE(seen_basic_info);
           if (seen_basic_info) break;
           seen_basic_info = true;
           JxlBasicInfo info;
           EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
           EXPECT_EQ(info.xsize, xsize);
           EXPECT_EQ(info.ysize, ysize);
         } else if (status == JXL_DEC_JPEG_RECONSTRUCTION) {
           EXPECT_FALSE(seen_basic_info);
           EXPECT_FALSE(seen_full_image);
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetJPEGBuffer(dec, jpeg_output.data(),
                                             jpeg_output.size()));
           seen_jpeg_recon = true;
         } else if (status == JXL_DEC_JPEG_NEED_MORE_OUTPUT) {
           EXPECT_TRUE(seen_jpeg_recon);
           used_jpeg_output =
               jpeg_output.size() - JxlDecoderReleaseJPEGBuffer(dec);
           jpeg_output.resize(jpeg_output.size() * 2);
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetJPEGBuffer(
                         dec, jpeg_output.data() + used_jpeg_output,
                         jpeg_output.size() - used_jpeg_output));
         } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetImageOutBuffer(
                         dec, &format_orig, pixels2.data(), pixels2.size()));
         } else if (status == JXL_DEC_FULL_IMAGE) {
           // This event should happen exactly once
           EXPECT_FALSE(seen_full_image);
           if (seen_full_image) break;
           // This event should happen after basic info
           EXPECT_TRUE(seen_basic_info);
           seen_full_image = true;
           if (reconstructible_jpeg) {
             used_jpeg_output =
                 jpeg_output.size() - JxlDecoderReleaseJPEGBuffer(dec);
             EXPECT_EQ(used_jpeg_output, jpeg_codestreams[i].size());
             EXPECT_EQ(0, memcmp(jpeg_output.data(), jpeg_codestreams[i].data(),
                                 used_jpeg_output));
           } else {
             EXPECT_EQ(pixels, pixels2);
           }
         } else if (status == JXL_DEC_SUCCESS) {
           EXPECT_TRUE(seen_full_image);
           break;
         } else {
           // We do not expect any other events or errors
           FAIL();
           break;
         }
       }
 
       // Ensure the decoder emitted the basic info and full image events
       EXPECT_TRUE(seen_basic_info);
       EXPECT_TRUE(seen_full_image);
 
       JxlDecoderDestroy(dec);
     }
   }
 }
 
 // Tests the return status when trying to decode pixels on incomplete file: it
 // should return JXL_DEC_NEED_MORE_INPUT, not error.
 TEST(DecodeTest, PixelPartialTest) { TestPartialStream(false); }
 
 // Tests the return status when trying to decode JPEG bytes on incomplete file.
 TEST(DecodeTest, JXL_TRANSCODE_JPEG_TEST(JPEGPartialTest)) {
   TEST_LIBJPEG_SUPPORT();
   TestPartialStream(true);
 }
 
 // The DC event still exists, but is no longer implemented, it is deprecated.
 TEST(DecodeTest, DCNotGettableTest) {
   // 1x1 pixel JXL image
   std::string compressed(
       "\377\n\0\20\260\23\0H\200("
       "\0\334\0U\17\0\0\250P\31e\334\340\345\\\317\227\37:,"
       "\246m\\gh\253m\vK\22E\306\261I\252C&pH\22\353 "
       "\363\6\22\bp\0\200\237\34\231W2d\255$\1",
       68);
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO));
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(
                 dec, reinterpret_cast<const uint8_t*>(compressed.data()),
                 compressed.size()));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
 
   // Since the image is only 1x1 pixel, there is only 1 group, the decoder is
   // unable to get DC size from this, and will not return the DC at all. Since
   // no full image is requested either, it is expected to return success.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, PreviewTest) {
   size_t xsize = 77;
   size_t ysize = 120;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   JxlPixelFormat format_orig = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   for (jxl::PreviewMode mode : {jxl::kSmallPreview, jxl::kBigPreview}) {
     jxl::TestCodestreamParams params;
     params.preview_mode = mode;
 
     std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 3, params);
 
     JxlPixelFormat format = {3, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
 
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     const uint8_t* next_in = compressed.data();
     size_t avail_in = compressed.size();
 
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSubscribeEvents(
                   dec, JXL_DEC_BASIC_INFO | JXL_DEC_PREVIEW_IMAGE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
     EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
     JxlBasicInfo info;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
     size_t buffer_size;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderPreviewOutBufferSize(dec, &format, &buffer_size));
 
     jxl::ColorEncoding c_srgb = jxl::ColorEncoding::SRGB(false);
     jxl::CodecInOut io0;
     EXPECT_TRUE(jxl::ConvertFromExternal(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, c_srgb,
         /*bits_per_sample=*/16, format_orig, /*pool=*/nullptr, &io0.Main()));
     GeneratePreview(params.preview_mode, &io0.Main());
 
     size_t xsize_preview = io0.Main().xsize();
     size_t ysize_preview = io0.Main().ysize();
     EXPECT_EQ(xsize_preview, info.preview.xsize);
     EXPECT_EQ(ysize_preview, info.preview.ysize);
     EXPECT_EQ(xsize_preview * ysize_preview * 3, buffer_size);
 
     EXPECT_EQ(JXL_DEC_NEED_PREVIEW_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     std::vector<uint8_t> preview(buffer_size);
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetPreviewOutBuffer(dec, &format, preview.data(),
                                             preview.size()));
 
     EXPECT_EQ(JXL_DEC_PREVIEW_IMAGE, JxlDecoderProcessInput(dec));
 
     jxl::CodecInOut io1;
     EXPECT_TRUE(
         jxl::ConvertFromExternal(jxl::Bytes(preview.data(), preview.size()),
                                  xsize_preview, ysize_preview, c_srgb,
                                  /*bits_per_sample=*/8, format,
                                  /*pool=*/nullptr, &io1.Main()));
 
     jxl::ButteraugliParams ba;
     // TODO(lode): this ButteraugliDistance silently returns 0 (dangerous for
     // tests) if xsize or ysize is < 8, no matter how different the images, a
     // tiny size that could happen for a preview. ButteraugliDiffmap does
     // support smaller than 8x8, but jxl's ButteraugliDistance does not. Perhaps
     // move butteraugli's <8x8 handling from ButteraugliDiffmap to
     // ButteraugliComparator::Diffmap in butteraugli.cc.
     EXPECT_LE(
         ButteraugliDistance(io0.frames, io1.frames, ba, *JxlGetDefaultCms(),
                             /*distmap=*/nullptr, nullptr),
         mode == jxl::kSmallPreview ? 0.7f : 1.2f);
 
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, AlignTest) {
   size_t xsize = 123;
   size_t ysize = 77;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   JxlPixelFormat format_orig = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::TestCodestreamParams params;
   // Lossless to verify pixels exactly after roundtrip.
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   size_t align = 17;
   JxlPixelFormat format = {3, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, align};
   // On purpose not using jxl::RoundUpTo to test it independently.
   size_t expected_line_size_last = 1 * 3 * xsize;
   size_t expected_line_size =
       ((expected_line_size_last + align - 1) / align) * align;
   size_t expected_pixels_size =
       expected_line_size * (ysize - 1) + expected_line_size_last;
 
   for (bool use_callback : {false, true}) {
     std::vector<uint8_t> pixels2 = jxl::DecodeWithAPI(
         jxl::Bytes(compressed.data(), compressed.size()), format, use_callback,
         /*set_buffer_early=*/false,
         /*use_resizable_runner=*/false, /*require_boxes=*/false,
         /*expect_success=*/true);
     EXPECT_EQ(expected_pixels_size, pixels2.size());
     EXPECT_EQ(0u, jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                            ysize, format_orig, format));
   }
 }
 
 TEST(DecodeTest, AnimationTest) {
   size_t xsize = 123;
   size_t ysize = 77;
   static const size_t num_frames = 2;
   std::vector<uint8_t> frames[2];
   frames[0] = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   frames[1] = jxl::test::GetSomeTestImage(xsize, ysize, 3, 1);
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations(num_frames);
   for (size_t i = 0; i < num_frames; ++i) {
     frame_durations[i] = 5 + i;
   }
 
   for (size_t i = 0; i < num_frames; ++i) {
     jxl::ImageBundle bundle(&io.metadata.m);
 
     EXPECT_TRUE(ConvertFromExternal(
         jxl::Bytes(frames[i].data(), frames[i].size()), xsize, ysize,
         jxl::ColorEncoding::SRGB(/*is_gray=*/false),
         /*bits_per_sample=*/16, format,
         /*pool=*/nullptr, &bundle));
     bundle.duration = frame_durations[i];
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.SetLossless();  // Lossless to verify pixels exactly after roundtrip.
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   // Decode and test the animation frames
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   const uint8_t* next_in = compressed.data();
   size_t avail_in = compressed.size();
 
   void* runner = JxlThreadParallelRunnerCreate(
       nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, JxlThreadParallelRunner, runner));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
 
   for (size_t i = 0; i < num_frames; ++i) {
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
     EXPECT_EQ(0u, frame_header.name_length);
     // For now, test with empty name, there's currently no easy way to encode
     // a jxl file with a frame name because ImageBundle doesn't have a
     // jxl::FrameHeader to set the name in. We can test the null termination
     // character though.
     char name;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameName(dec, &name, 1));
     EXPECT_EQ(0, name);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
   }
 
   // After all frames were decoded, JxlDecoderProcessInput should return
   // success to indicate all is done.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   JxlThreadParallelRunnerDestroy(runner);
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, AnimationTestStreaming) {
   size_t xsize = 123;
   size_t ysize = 77;
   static const size_t num_frames = 2;
   std::vector<uint8_t> frames[2];
   frames[0] = jxl::test::GetSomeTestImage(xsize, ysize, 3, 0);
   frames[1] = jxl::test::GetSomeTestImage(xsize, ysize, 3, 1);
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations(num_frames);
   for (size_t i = 0; i < num_frames; ++i) {
     frame_durations[i] = 5 + i;
   }
 
   for (size_t i = 0; i < num_frames; ++i) {
     jxl::ImageBundle bundle(&io.metadata.m);
 
     EXPECT_TRUE(ConvertFromExternal(
         jxl::Bytes(frames[i].data(), frames[i].size()), xsize, ysize,
         jxl::ColorEncoding::SRGB(/*is_gray=*/false),
         /*bits_per_sample=*/16, format,
         /*pool=*/nullptr, &bundle));
     bundle.duration = frame_durations[i];
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.SetLossless();  // Lossless to verify pixels exactly after roundtrip.
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   // Decode and test the animation frames
 
   const size_t step_size = 16;
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   const uint8_t* next_in = compressed.data();
   size_t avail_in = 0;
   size_t frame_headers_seen = 0;
   size_t frames_seen = 0;
   bool seen_basic_info = false;
 
   void* runner = JxlThreadParallelRunnerCreate(
       nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, JxlThreadParallelRunner, runner));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   std::vector<uint8_t> frames2[2];
   for (size_t i = 0; i < num_frames; ++i) {
     frames2[i].resize(frames[i].size());
   }
 
   size_t total_in = 0;
   size_t loop_count = 0;
 
   for (;;) {
     if (loop_count++ > compressed.size()) {
       fprintf(stderr, "Too many loops\n");
       FAIL();
       break;
     }
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     auto status = JxlDecoderProcessInput(dec);
     size_t remaining = JxlDecoderReleaseInput(dec);
     EXPECT_LE(remaining, avail_in);
     next_in += avail_in - remaining;
     avail_in = remaining;
 
     if (status == JXL_DEC_SUCCESS) {
       break;
     } else if (status == JXL_DEC_ERROR) {
       FAIL();
     } else if (status == JXL_DEC_NEED_MORE_INPUT) {
       if (total_in >= compressed.size()) {
         fprintf(stderr, "Already gave all input data\n");
         FAIL();
         break;
       }
       size_t amount = step_size;
       if (total_in + amount > compressed.size()) {
         amount = compressed.size() - total_in;
       }
       avail_in += amount;
       total_in += amount;
     } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                      dec, &format, frames2[frames_seen].data(),
                                      frames2[frames_seen].size()));
     } else if (status == JXL_DEC_BASIC_INFO) {
       EXPECT_EQ(false, seen_basic_info);
       seen_basic_info = true;
       JxlBasicInfo info;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
       EXPECT_EQ(xsize, info.xsize);
       EXPECT_EQ(ysize, info.ysize);
     } else if (status == JXL_DEC_FRAME) {
       EXPECT_EQ(true, seen_basic_info);
       frame_headers_seen++;
     } else if (status == JXL_DEC_FULL_IMAGE) {
       frames_seen++;
       EXPECT_EQ(frame_headers_seen, frames_seen);
     } else {
       fprintf(stderr, "Unexpected status: %d\n", static_cast<int>(status));
       FAIL();
     }
   }
 
   EXPECT_EQ(true, seen_basic_info);
   EXPECT_EQ(num_frames, frames_seen);
   EXPECT_EQ(num_frames, frame_headers_seen);
   for (size_t i = 0; i < num_frames; ++i) {
     EXPECT_EQ(frames[i], frames2[i]);
   }
 
   JxlThreadParallelRunnerDestroy(runner);
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, ExtraChannelTest) {
   size_t xsize = 55;
   size_t ysize = 257;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   JxlPixelFormat format_orig = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::TestCodestreamParams params;
   // Lossless to verify pixels exactly after roundtrip.
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   size_t align = 17;
   JxlPixelFormat format = {3, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, align};
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(
                                  dec, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(1u, info.num_extra_channels);
   EXPECT_EQ(JXL_FALSE, info.alpha_premultiplied);
 
   JxlExtraChannelInfo extra_info;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderGetExtraChannelInfo(dec, 0, &extra_info));
   EXPECT_EQ(0, extra_info.type);
 
   EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   size_t extra_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderExtraChannelBufferSize(dec, &format, &extra_size, 0));
 
   std::vector<uint8_t> image(buffer_size);
   std::vector<uint8_t> extra(extra_size);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &format, image.data(), image.size()));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetExtraChannelBuffer(
                                  dec, &format, extra.data(), extra.size(), 0));
 
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
 
   // After the full image was output, JxlDecoderProcessInput should return
   // success to indicate all is done.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
   JxlDecoderDestroy(dec);
 
   EXPECT_EQ(0u, jxl::test::ComparePixels(pixels.data(), image.data(), xsize,
                                          ysize, format_orig, format));
 
   // Compare the extracted extra channel with the original alpha channel
 
   std::vector<uint8_t> alpha(pixels.size() / 4);
   for (size_t i = 0; i < pixels.size(); i += 8) {
     size_t index_alpha = i / 4;
     alpha[index_alpha + 0] = pixels[i + 6];
     alpha[index_alpha + 1] = pixels[i + 7];
   }
   JxlPixelFormat format_alpha = format;
   format_alpha.num_channels = 1;
   JxlPixelFormat format_orig_alpha = format_orig;
   format_orig_alpha.num_channels = 1;
 
   EXPECT_EQ(0u,
             jxl::test::ComparePixels(alpha.data(), extra.data(), xsize, ysize,
                                      format_orig_alpha, format_alpha));
 }
 
 TEST(DecodeTest, SkipCurrentFrameTest) {
   size_t xsize = 90;
   size_t ysize = 120;
   constexpr size_t num_frames = 7;
   std::vector<uint8_t> frames[num_frames];
   for (size_t i = 0; i < num_frames; i++) {
     frames[i] = jxl::test::GetSomeTestImage(xsize, ysize, 3, i);
   }
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations(num_frames);
   for (size_t i = 0; i < num_frames; ++i) {
     frame_durations[i] = 5 + i;
   }
 
   for (size_t i = 0; i < num_frames; ++i) {
     jxl::ImageBundle bundle(&io.metadata.m);
     if (i & 1) {
       // Mark some frames as referenceable, others not.
       bundle.use_for_next_frame = true;
     }
 
     EXPECT_TRUE(ConvertFromExternal(
         jxl::Bytes(frames[i].data(), frames[i].size()), xsize, ysize,
         jxl::ColorEncoding::SRGB(/*is_gray=*/false),
         /*bits_per_sample=*/16, format,
         /*pool=*/nullptr, &bundle));
     bundle.duration = frame_durations[i];
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   jxl::PassDefinition passes[] = {{2, 0, 4}, {4, 0, 4}, {8, 2, 2}, {8, 0, 1}};
   jxl::ProgressiveMode progressive_mode{passes};
   cparams.custom_progressive_mode = &progressive_mode;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   const uint8_t* next_in = compressed.data();
   size_t avail_in = compressed.size();
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME |
                                                JXL_DEC_FRAME_PROGRESSION |
                                                JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetProgressiveDetail(dec, kLastPasses));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
 
   for (size_t i = 0; i < num_frames; ++i) {
     printf("Decoding frame %d\n", static_cast<int>(i));
     EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSkipCurrentFrame(dec));
     std::vector<uint8_t> pixels(buffer_size);
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSkipCurrentFrame(dec));
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
     if (i == 2) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSkipCurrentFrame(dec));
       continue;
     }
     EXPECT_EQ(JXL_DEC_FRAME_PROGRESSION, JxlDecoderProcessInput(dec));
     EXPECT_EQ(8, JxlDecoderGetIntendedDownsamplingRatio(dec));
     if (i == 3) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSkipCurrentFrame(dec));
       continue;
     }
     EXPECT_EQ(JXL_DEC_FRAME_PROGRESSION, JxlDecoderProcessInput(dec));
     EXPECT_EQ(4, JxlDecoderGetIntendedDownsamplingRatio(dec));
     if (i == 4) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSkipCurrentFrame(dec));
       continue;
     }
     EXPECT_EQ(JXL_DEC_FRAME_PROGRESSION, JxlDecoderProcessInput(dec));
     EXPECT_EQ(2, JxlDecoderGetIntendedDownsamplingRatio(dec));
     if (i == 5) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSkipCurrentFrame(dec));
       continue;
     }
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSkipCurrentFrame(dec));
   }
 
   // After all frames were decoded, JxlDecoderProcessInput should return
   // success to indicate all is done.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, SkipFrameTest) {
   size_t xsize = 90;
   size_t ysize = 120;
   constexpr size_t num_frames = 16;
   std::vector<uint8_t> frames[num_frames];
   for (size_t i = 0; i < num_frames; i++) {
     frames[i] = jxl::test::GetSomeTestImage(xsize, ysize, 3, i);
   }
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations(num_frames);
   for (size_t i = 0; i < num_frames; ++i) {
     frame_durations[i] = 5 + i;
   }
 
   for (size_t i = 0; i < num_frames; ++i) {
     jxl::ImageBundle bundle(&io.metadata.m);
     if (i & 1) {
       // Mark some frames as referenceable, others not.
       bundle.use_for_next_frame = true;
     }
 
     EXPECT_TRUE(ConvertFromExternal(
         jxl::Bytes(frames[i].data(), frames[i].size()), xsize, ysize,
         jxl::ColorEncoding::SRGB(/*is_gray=*/false),
         /*bits_per_sample=*/16, format,
         /*pool=*/nullptr, &bundle));
     bundle.duration = frame_durations[i];
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.SetLossless();  // Lossless to verify pixels exactly after roundtrip.
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   // Decode and test the animation frames
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   const uint8_t* next_in = compressed.data();
   size_t avail_in = compressed.size();
 
   void* runner = JxlThreadParallelRunnerCreate(
       nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, JxlThreadParallelRunner, runner));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
 
   for (size_t i = 0; i < num_frames; ++i) {
     if (i == 3) {
       JxlDecoderSkipFrames(dec, 5);
       i += 5;
     }
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
   }
 
   // After all frames were decoded, JxlDecoderProcessInput should return
   // success to indicate all is done.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   // Test rewinding the decoder and skipping different frames
 
   JxlDecoderRewind(dec);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   for (size_t i = 0; i < num_frames; ++i) {
     int test_skipping = (i == 9) ? 3 : 0;
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     // Since this is after JXL_DEC_FRAME but before JXL_DEC_FULL_IMAGE, this
     // should only skip the next frame, not the currently processed one.
     if (test_skipping) JxlDecoderSkipFrames(dec, test_skipping);
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
 
     if (test_skipping) i += test_skipping;
   }
 
   JxlThreadParallelRunnerDestroy(runner);
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, SkipFrameWithBlendingTest) {
   size_t xsize = 90;
   size_t ysize = 120;
   constexpr size_t num_frames = 16;
   std::vector<uint8_t> frames[num_frames];
   JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations(num_frames);
 
   for (size_t i = 0; i < num_frames; ++i) {
     if (i < 5) {
       std::vector<uint8_t> frame_internal =
           jxl::test::GetSomeTestImage(xsize, ysize, 3, i * 2 + 1);
       // An internal frame with 0 duration, and use_for_next_frame, this is a
       // frame that is not rendered and not output by the API, but on which the
       // rendered frames depend
       jxl::ImageBundle bundle_internal(&io.metadata.m);
       EXPECT_TRUE(ConvertFromExternal(
           jxl::Bytes(frame_internal.data(), frame_internal.size()), xsize,
           ysize, jxl::ColorEncoding::SRGB(/*is_gray=*/false),
           /*bits_per_sample=*/16, format,
           /*pool=*/nullptr, &bundle_internal));
       bundle_internal.duration = 0;
       bundle_internal.use_for_next_frame = true;
       io.frames.push_back(std::move(bundle_internal));
     }
 
     std::vector<uint8_t> frame =
         jxl::test::GetSomeTestImage(xsize, ysize, 3, i * 2);
     // Actual rendered frame
     frame_durations[i] = 5 + i;
     jxl::ImageBundle bundle(&io.metadata.m);
     EXPECT_TRUE(ConvertFromExternal(jxl::Bytes(frame.data(), frame.size()),
                                     xsize, ysize,
                                     jxl::ColorEncoding::SRGB(/*is_gray=*/false),
                                     /*bits_per_sample=*/16, format,
                                     /*pool=*/nullptr, &bundle));
     bundle.duration = frame_durations[i];
     // Create some variation in which frames depend on which.
     if (i != 3 && i != 9 && i != 10) {
       bundle.use_for_next_frame = true;
     }
     if (i != 12) {
       bundle.blend = true;
       // Choose a blend mode that depends on the pixels of the saved frame and
       // doesn't use alpha
       bundle.blendmode = jxl::BlendMode::kMul;
     }
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.SetLossless();  // Lossless to verify pixels exactly after roundtrip.
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   // Independently decode all frames without any skipping, to create the
   // expected blended frames, for the actual tests below to compare with.
   {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     const uint8_t* next_in = compressed.data();
     size_t avail_in = compressed.size();
 
     void* runner = JxlThreadParallelRunnerCreate(
         nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetParallelRunner(
                                    dec, JxlThreadParallelRunner, runner));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSubscribeEvents(dec, JXL_DEC_FULL_IMAGE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     for (auto& frame : frames) {
       EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
       frame.resize(xsize * ysize * 6);
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                      dec, &format, frame.data(), frame.size()));
       EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     }
 
     // After all frames were decoded, JxlDecoderProcessInput should return
     // success to indicate all is done.
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
     JxlThreadParallelRunnerDestroy(runner);
     JxlDecoderDestroy(dec);
   }
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   const uint8_t* next_in = compressed.data();
   size_t avail_in = compressed.size();
 
   void* runner = JxlThreadParallelRunnerCreate(
       nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetParallelRunner(dec, JxlThreadParallelRunner, runner));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
 
   for (size_t i = 0; i < num_frames; ++i) {
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
 
     // Test rewinding mid-way, not decoding all frames.
     if (i == 8) {
       break;
     }
   }
 
   JxlDecoderRewind(dec);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   for (size_t i = 0; i < num_frames; ++i) {
     if (i == 3) {
       JxlDecoderSkipFrames(dec, 5);
       i += 5;
     }
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
   }
 
   // After all frames were decoded, JxlDecoderProcessInput should return
   // success to indicate all is done.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   // Test rewinding the decoder and skipping different frames
 
   JxlDecoderRewind(dec);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
   for (size_t i = 0; i < num_frames; ++i) {
     int test_skipping = (i == 9) ? 3 : 0;
     std::vector<uint8_t> pixels(buffer_size);
 
     EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
     // Since this is after JXL_DEC_FRAME but before JXL_DEC_FULL_IMAGE, this
     // should only skip the next frame, not the currently processed one.
     if (test_skipping) JxlDecoderSkipFrames(dec, test_skipping);
 
     JxlFrameHeader frame_header;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
     EXPECT_EQ(frame_durations[i], frame_header.duration);
 
     EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, pixels.data(), pixels.size()));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                            xsize, ysize, format, format));
 
     if (test_skipping) i += test_skipping;
   }
 
   JxlThreadParallelRunnerDestroy(runner);
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, SkipFrameWithAlphaBlendingTest) {
   size_t xsize = 90;
   size_t ysize = 120;
   constexpr size_t num_frames = 16;
   std::vector<uint8_t> frames[num_frames + 5];
   JxlPixelFormat format = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   jxl::CodecInOut io;
   io.SetSize(xsize, ysize);
   io.metadata.m.SetUintSamples(16);
   io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
   io.metadata.m.have_animation = true;
   io.frames.clear();
   io.frames.reserve(num_frames + 5);
   io.SetSize(xsize, ysize);
 
   std::vector<uint32_t> frame_durations_c;
   std::vector<uint32_t> frame_durations_nc;
   std::vector<uint32_t> frame_xsize;
   std::vector<uint32_t> frame_ysize;
   std::vector<uint32_t> frame_x0;
   std::vector<uint32_t> frame_y0;
 
   for (size_t i = 0; i < num_frames; ++i) {
     size_t cropxsize = 1 + xsize * 2 / (i + 1);
     size_t cropysize = 1 + ysize * 3 / (i + 2);
     int cropx0 = i * 3 - 8;
     int cropy0 = i * 4 - 7;
     if (i < 5) {
       std::vector<uint8_t> frame_internal =
           jxl::test::GetSomeTestImage(xsize / 2, ysize / 2, 4, i * 2 + 1);
       // An internal frame with 0 duration, and use_for_next_frame, this is a
       // frame that is not rendered and not output by default by the API, but on
       // which the rendered frames depend
       jxl::ImageBundle bundle_internal(&io.metadata.m);
       EXPECT_TRUE(ConvertFromExternal(
           jxl::Bytes(frame_internal.data(), frame_internal.size()), xsize / 2,
           ysize / 2, jxl::ColorEncoding::SRGB(/*is_gray=*/false),
           /*bits_per_sample=*/16, format,
           /*pool=*/nullptr, &bundle_internal));
       bundle_internal.duration = 0;
       bundle_internal.use_for_next_frame = true;
       bundle_internal.origin = {13, 17};
       io.frames.push_back(std::move(bundle_internal));
       frame_durations_nc.push_back(0);
       frame_xsize.push_back(xsize / 2);
       frame_ysize.push_back(ysize / 2);
       frame_x0.push_back(13);
       frame_y0.push_back(17);
     }
 
     std::vector<uint8_t> frame =
         jxl::test::GetSomeTestImage(cropxsize, cropysize, 4, i * 2);
     // Actual rendered frame
     jxl::ImageBundle bundle(&io.metadata.m);
     EXPECT_TRUE(ConvertFromExternal(jxl::Bytes(frame.data(), frame.size()),
                                     cropxsize, cropysize,
                                     jxl::ColorEncoding::SRGB(/*is_gray=*/false),
                                     /*bits_per_sample=*/16, format,
                                     /*pool=*/nullptr, &bundle));
     bundle.duration = 5 + i;
     frame_durations_nc.push_back(5 + i);
     frame_durations_c.push_back(5 + i);
     frame_xsize.push_back(cropxsize);
     frame_ysize.push_back(cropysize);
     frame_x0.push_back(cropx0);
     frame_y0.push_back(cropy0);
     bundle.origin = {cropx0, cropy0};
     // Create some variation in which frames depend on which.
     if (i != 3 && i != 9 && i != 10) {
       bundle.use_for_next_frame = true;
     }
     if (i != 12) {
       bundle.blend = true;
       bundle.blendmode = jxl::BlendMode::kBlend;
     }
     io.frames.push_back(std::move(bundle));
   }
 
   jxl::CompressParams cparams;
   cparams.SetLossless();  // Lossless to verify pixels exactly after roundtrip.
   cparams.speed_tier = jxl::SpeedTier::kThunder;
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
   // try both with and without coalescing
   for (auto coalescing : {JXL_TRUE, JXL_FALSE}) {
     // Independently decode all frames without any skipping, to create the
     // expected blended frames, for the actual tests below to compare with.
     {
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
       const uint8_t* next_in = compressed.data();
       size_t avail_in = compressed.size();
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetCoalescing(dec, coalescing));
       void* runner = JxlThreadParallelRunnerCreate(
           nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetParallelRunner(
                                      dec, JxlThreadParallelRunner, runner));
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSubscribeEvents(dec, JXL_DEC_FULL_IMAGE));
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
       for (size_t i = 0; i < num_frames + (coalescing ? 0 : 5); ++i) {
         EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
         size_t buffer_size;
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
         if (coalescing) {
           EXPECT_EQ(xsize * ysize * 8, buffer_size);
         } else {
           EXPECT_EQ(frame_xsize[i] * frame_ysize[i] * 8, buffer_size);
         }
         frames[i].resize(buffer_size);
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetImageOutBuffer(dec, &format, frames[i].data(),
                                               frames[i].size()));
         EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
       }
 
       // After all frames were decoded, JxlDecoderProcessInput should return
       // success to indicate all is done.
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
       JxlThreadParallelRunnerDestroy(runner);
       JxlDecoderDestroy(dec);
     }
 
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
     const uint8_t* next_in = compressed.data();
     size_t avail_in = compressed.size();
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetCoalescing(dec, coalescing));
     void* runner = JxlThreadParallelRunnerCreate(
         nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetParallelRunner(
                                    dec, JxlThreadParallelRunner, runner));
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(
                                    dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME |
                                             JXL_DEC_FULL_IMAGE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
     JxlBasicInfo info;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
 
     for (size_t i = 0; i < num_frames; ++i) {
       EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
       size_t buffer_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
       std::vector<uint8_t> pixels(buffer_size);
 
       JxlFrameHeader frame_header;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
       EXPECT_EQ((coalescing ? frame_durations_c[i] : frame_durations_nc[i]),
                 frame_header.duration);
 
       EXPECT_EQ(i + 1 == num_frames, frame_header.is_last);
 
       EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetImageOutBuffer(dec, &format, pixels.data(),
                                             pixels.size()));
 
       EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
       if (coalescing) {
         EXPECT_EQ(frame_header.layer_info.xsize, xsize);
       } else {
         EXPECT_EQ(frame_header.layer_info.xsize, frame_xsize[i]);
       }
       if (coalescing) {
         EXPECT_EQ(frame_header.layer_info.ysize, ysize);
       } else {
         EXPECT_EQ(frame_header.layer_info.ysize, frame_ysize[i]);
       }
       EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                              frame_header.layer_info.xsize,
                                              frame_header.layer_info.ysize,
                                              format, format));
 
       // Test rewinding mid-way, not decoding all frames.
       if (i == 8) {
         break;
       }
     }
 
     JxlDecoderRewind(dec);
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(
                                    dec, JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
     for (size_t i = 0; i < num_frames + (coalescing ? 0 : 5); ++i) {
       if (i == 3) {
         JxlDecoderSkipFrames(dec, 5);
         i += 5;
       }
 
       EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
       size_t buffer_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
       std::vector<uint8_t> pixels(buffer_size);
 
       JxlFrameHeader frame_header;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
       EXPECT_EQ((coalescing ? frame_durations_c[i] : frame_durations_nc[i]),
                 frame_header.duration);
 
       EXPECT_EQ(i + 1 == num_frames + (coalescing ? 0 : 5),
                 frame_header.is_last);
 
       EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetImageOutBuffer(dec, &format, pixels.data(),
                                             pixels.size()));
 
       EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
       if (coalescing) {
         EXPECT_EQ(frame_header.layer_info.xsize, xsize);
         EXPECT_EQ(frame_header.layer_info.ysize, ysize);
         EXPECT_EQ(frame_header.layer_info.crop_x0, 0);
         EXPECT_EQ(frame_header.layer_info.crop_y0, 0);
       } else {
         EXPECT_EQ(frame_header.layer_info.xsize, frame_xsize[i]);
         EXPECT_EQ(frame_header.layer_info.ysize, frame_ysize[i]);
         EXPECT_EQ(frame_header.layer_info.crop_x0, frame_x0[i]);
         EXPECT_EQ(frame_header.layer_info.crop_y0, frame_y0[i]);
         EXPECT_EQ(frame_header.layer_info.blend_info.blendmode,
                   i != 12 + 5 && frame_header.duration != 0
                       ? 2
                       : 0);  // kBlend or the default kReplace
       }
       EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                              frame_header.layer_info.xsize,
                                              frame_header.layer_info.ysize,
                                              format, format));
     }
 
     // After all frames were decoded, JxlDecoderProcessInput should return
     // success to indicate all is done.
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
     // Test rewinding the decoder and skipping different frames
 
     JxlDecoderRewind(dec);
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(
                                    dec, JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
 
     for (size_t i = 0; i < num_frames + (coalescing ? 0 : 5); ++i) {
       int test_skipping = (i == 9) ? 3 : 0;
 
       EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
       size_t buffer_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
       std::vector<uint8_t> pixels(buffer_size);
 
       // Since this is after JXL_DEC_FRAME but before JXL_DEC_FULL_IMAGE, this
       // should only skip the next frame, not the currently processed one.
       if (test_skipping) JxlDecoderSkipFrames(dec, test_skipping);
 
       JxlFrameHeader frame_header;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetFrameHeader(dec, &frame_header));
       EXPECT_EQ((coalescing ? frame_durations_c[i] : frame_durations_nc[i]),
                 frame_header.duration);
 
       EXPECT_EQ(i + 1 == num_frames + (coalescing ? 0 : 5),
                 frame_header.is_last);
 
       EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
 
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetImageOutBuffer(dec, &format, pixels.data(),
                                             pixels.size()));
 
       EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
       EXPECT_EQ(0u, jxl::test::ComparePixels(frames[i].data(), pixels.data(),
                                              frame_header.layer_info.xsize,
                                              frame_header.layer_info.ysize,
                                              format, format));
 
       if (test_skipping) i += test_skipping;
     }
 
     JxlThreadParallelRunnerDestroy(runner);
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, OrientedCroppedFrameTest) {
   const auto test = [](bool keep_orientation, uint32_t orientation,
                        uint32_t resampling) {
     size_t xsize = 90;
     size_t ysize = 120;
     JxlPixelFormat format = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     size_t oxsize = (!keep_orientation && orientation > 4 ? ysize : xsize);
     size_t oysize = (!keep_orientation && orientation > 4 ? xsize : ysize);
     jxl::CodecInOut io;
     io.SetSize(xsize, ysize);
     io.metadata.m.SetUintSamples(16);
     io.metadata.m.color_encoding = jxl::ColorEncoding::SRGB(false);
     io.metadata.m.orientation = orientation;
     io.frames.clear();
     io.SetSize(xsize, ysize);
 
     for (size_t i = 0; i < 3; ++i) {
       size_t cropxsize = 1 + xsize * 2 / (i + 1);
       size_t cropysize = 1 + ysize * 3 / (i + 2);
       int cropx0 = i * 3 - 8;
       int cropy0 = i * 4 - 7;
 
       std::vector<uint8_t> frame =
           jxl::test::GetSomeTestImage(cropxsize, cropysize, 4, i * 2);
       jxl::ImageBundle bundle(&io.metadata.m);
       EXPECT_TRUE(ConvertFromExternal(
           jxl::Bytes(frame.data(), frame.size()), cropxsize, cropysize,
           jxl::ColorEncoding::SRGB(/*is_gray=*/false),
           /*bits_per_sample=*/16, format,
           /*pool=*/nullptr, &bundle));
       bundle.origin = {cropx0, cropy0};
       bundle.use_for_next_frame = true;
       io.frames.push_back(std::move(bundle));
     }
 
     jxl::CompressParams cparams;
     cparams
         .SetLossless();  // Lossless to verify pixels exactly after roundtrip.
     cparams.speed_tier = jxl::SpeedTier::kThunder;
     cparams.resampling = resampling;
     std::vector<uint8_t> compressed;
     EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
     // 0 is merged frame as decoded with coalescing enabled (default)
     // 1-3 are non-coalesced frames as decoded with coalescing disabled
     // 4 is the manually merged frame
     std::vector<uint8_t> frames[5];
     frames[4].resize(xsize * ysize * 8, 0);
 
     // try both with and without coalescing
     for (auto coalescing : {JXL_TRUE, JXL_FALSE}) {
       // Independently decode all frames without any skipping, to create the
       // expected blended frames, for the actual tests below to compare with.
       {
         JxlDecoder* dec = JxlDecoderCreate(nullptr);
         const uint8_t* next_in = compressed.data();
         size_t avail_in = compressed.size();
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetCoalescing(dec, coalescing));
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetKeepOrientation(dec, keep_orientation));
         void* runner = JxlThreadParallelRunnerCreate(
             nullptr, JxlThreadParallelRunnerDefaultNumWorkerThreads());
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetParallelRunner(
                                        dec, JxlThreadParallelRunner, runner));
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSubscribeEvents(dec, JXL_DEC_FULL_IMAGE));
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
         for (size_t i = (coalescing ? 0 : 1); i < (coalescing ? 1 : 4); ++i) {
           EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
           JxlFrameHeader frame_header;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderGetFrameHeader(dec, &frame_header));
           size_t buffer_size;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
           if (coalescing) {
             EXPECT_EQ(xsize * ysize * 8, buffer_size);
           } else {
             EXPECT_EQ(frame_header.layer_info.xsize *
                           frame_header.layer_info.ysize * 8,
                       buffer_size);
           }
           frames[i].resize(buffer_size);
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetImageOutBuffer(dec, &format, frames[i].data(),
                                                 frames[i].size()));
           EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
           EXPECT_EQ(frame_header.layer_info.blend_info.blendmode,
                     JXL_BLEND_REPLACE);
           if (coalescing) {
             EXPECT_EQ(frame_header.layer_info.xsize, oxsize);
             EXPECT_EQ(frame_header.layer_info.ysize, oysize);
             EXPECT_EQ(frame_header.layer_info.crop_x0, 0);
             EXPECT_EQ(frame_header.layer_info.crop_y0, 0);
           } else {
             // manually merge this layer
             int x0 = frame_header.layer_info.crop_x0;
             int y0 = frame_header.layer_info.crop_y0;
             int w = frame_header.layer_info.xsize;
             int h = frame_header.layer_info.ysize;
             for (int y = 0; y < static_cast<int>(oysize); y++) {
               if (y < y0 || y >= y0 + h) continue;
               // pointers do whole 16-bit RGBA pixels at a time
               uint64_t* row_merged = reinterpret_cast<uint64_t*>(
                   frames[4].data() + y * oxsize * 8);
               uint64_t* row_layer = reinterpret_cast<uint64_t*>(
                   frames[i].data() + (y - y0) * w * 8);
               for (int x = 0; x < static_cast<int>(oxsize); x++) {
                 if (x < x0 || x >= x0 + w) continue;
                 row_merged[x] = row_layer[x - x0];
               }
             }
           }
         }
 
         // After all frames were decoded, JxlDecoderProcessInput should return
         // success to indicate all is done.
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
         JxlThreadParallelRunnerDestroy(runner);
         JxlDecoderDestroy(dec);
       }
     }
 
     EXPECT_EQ(0u, jxl::test::ComparePixels(frames[0].data(), frames[4].data(),
                                            oxsize, oysize, format, format));
   };
 
   for (bool keep_orientation : {true, false}) {
     for (uint32_t orientation = 1; orientation <= 8; orientation++) {
       for (uint32_t resampling : {1, 2, 4, 8}) {
         SCOPED_TRACE(testing::Message()
                      << "keep_orientation: " << keep_orientation << ", "
                      << "orientation: " << orientation << ", "
                      << "resampling: " << resampling);
         test(keep_orientation, orientation, resampling);
       }
     }
   }
 }
 
 struct FramePositions {
   size_t frame_start;
   size_t header_end;
   size_t toc_end;
   std::vector<size_t> section_end;
 };
 
 struct StreamPositions {
   size_t codestream_start;
   size_t codestream_end;
   size_t basic_info;
   size_t jbrd_end = 0;
   std::vector<size_t> box_start;
   std::vector<FramePositions> frames;
 };
 
 void AnalyzeCodestream(const std::vector<uint8_t>& data,
                        StreamPositions* streampos) {
   // Unbox data to codestream and mark where it is broken up by boxes.
   std::vector<uint8_t> codestream;
   std::vector<std::pair<size_t, size_t>> breakpoints;
   bool codestream_end = false;
   ASSERT_LE(2, data.size());
   if (data[0] == 0xff && data[1] == 0x0a) {
     codestream = std::vector<uint8_t>(data.begin(), data.end());
     streampos->codestream_start = 0;
   } else {
     const uint8_t* in = data.data();
     size_t pos = 0;
     while (pos < data.size()) {
       ASSERT_LE(pos + 8, data.size());
       streampos->box_start.push_back(pos);
       size_t box_size = LoadBE32(in + pos);
       if (box_size == 0) box_size = data.size() - pos;
       ASSERT_LE(pos + box_size, data.size());
       if (memcmp(in + pos + 4, "jxlc", 4) == 0) {
         EXPECT_TRUE(codestream.empty());
         streampos->codestream_start = pos + 8;
         codestream.insert(codestream.end(), in + pos + 8, in + pos + box_size);
         codestream_end = true;
       } else if (memcmp(in + pos + 4, "jxlp", 4) == 0) {
         codestream_end = ((LoadBE32(in + pos + 8) & 0x80000000) != 0);
         if (codestream.empty()) {
           streampos->codestream_start = pos + 12;
         } else if (box_size > 12 || !codestream_end) {
           breakpoints.emplace_back(codestream.size(), 12);
         }
         codestream.insert(codestream.end(), in + pos + 12, in + pos + box_size);
       } else if (memcmp(in + pos + 4, "jbrd", 4) == 0) {
         EXPECT_TRUE(codestream.empty());
         streampos->jbrd_end = pos + box_size;
       } else if (!codestream.empty() && !codestream_end) {
         breakpoints.emplace_back(codestream.size(), box_size);
       }
       pos += box_size;
     }
     ASSERT_EQ(pos, data.size());
   }
   // Translate codestream positions to boxed stream positions.
   size_t offset = streampos->codestream_start;
   size_t bp = 0;
   auto add_offset = [&](size_t pos) {
     while (bp < breakpoints.size() && pos >= breakpoints[bp].first) {
       offset += breakpoints[bp++].second;
     }
     return pos + offset;
   };
   // Analyze the unboxed codestream.
   jxl::BitReader br(jxl::Bytes(codestream.data(), codestream.size()));
   ASSERT_EQ(br.ReadFixedBits<16>(), 0x0AFF);
   jxl::CodecMetadata metadata;
   ASSERT_TRUE(ReadSizeHeader(&br, &metadata.size));
   ASSERT_TRUE(ReadImageMetadata(&br, &metadata.m));
   streampos->basic_info =
       add_offset(br.TotalBitsConsumed() / jxl::kBitsPerByte);
   metadata.transform_data.nonserialized_xyb_encoded = metadata.m.xyb_encoded;
   ASSERT_TRUE(jxl::Bundle::Read(&br, &metadata.transform_data));
   if (metadata.m.color_encoding.WantICC()) {
     std::vector<uint8_t> icc;
     ASSERT_TRUE(jxl::test::ReadICC(&br, &icc));
     ASSERT_TRUE(!icc.empty());
     metadata.m.color_encoding.SetICCRaw(std::move(icc));
   }
   ASSERT_TRUE(br.JumpToByteBoundary());
   bool has_preview = metadata.m.have_preview;
   while (br.TotalBitsConsumed() < br.TotalBytes() * jxl::kBitsPerByte) {
     FramePositions p;
     p.frame_start = add_offset(br.TotalBitsConsumed() / jxl::kBitsPerByte);
     jxl::FrameHeader frame_header(&metadata);
     if (has_preview) {
       frame_header.nonserialized_is_preview = true;
       has_preview = false;
     }
     ASSERT_TRUE(ReadFrameHeader(&br, &frame_header));
     p.header_end =
         add_offset(jxl::DivCeil(br.TotalBitsConsumed(), jxl::kBitsPerByte));
     jxl::FrameDimensions frame_dim = frame_header.ToFrameDimensions();
     uint64_t groups_total_size;
     const size_t toc_entries =
         jxl::NumTocEntries(frame_dim.num_groups, frame_dim.num_dc_groups,
                            frame_header.passes.num_passes);
     std::vector<uint64_t> section_offsets;
     std::vector<uint32_t> section_sizes;
     ASSERT_TRUE(ReadGroupOffsets(toc_entries, &br, &section_offsets,
                                  &section_sizes, &groups_total_size));
     EXPECT_EQ(br.TotalBitsConsumed() % jxl::kBitsPerByte, 0);
     size_t sections_start = br.TotalBitsConsumed() / jxl::kBitsPerByte;
     p.toc_end = add_offset(sections_start);
     for (size_t i = 0; i < toc_entries; ++i) {
       size_t end = sections_start + section_offsets[i] + section_sizes[i];
       p.section_end.push_back(add_offset(end));
     }
     br.SkipBits(groups_total_size * jxl::kBitsPerByte);
     streampos->frames.push_back(p);
   }
   streampos->codestream_end = add_offset(codestream.size());
   EXPECT_EQ(br.TotalBitsConsumed(), br.TotalBytes() * jxl::kBitsPerByte);
   EXPECT_TRUE(br.Close());
 }
 
 enum ExpectedFlushState { NO_FLUSH, SAME_FLUSH, NEW_FLUSH };
 struct Breakpoint {
   size_t file_pos;
   ExpectedFlushState expect_flush;
 };
 
 void VerifyProgression(size_t xsize, size_t ysize, uint32_t num_channels,
                        const std::vector<uint8_t>& pixels,
                        const std::vector<uint8_t>& data,
                        std::vector<Breakpoint> breakpoints) {
   // Size large enough for multiple groups, required to have progressive stages.
   ASSERT_LT(256, xsize);
   ASSERT_LT(256, ysize);
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
   int bp = 0;
   const uint8_t* next_in = data.data();
   size_t avail_in = breakpoints[bp].file_pos;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   double prev_dist = 1.0;
   for (;;) {
     JxlDecoderStatus status = JxlDecoderProcessInput(dec);
     printf("bp: %d  status: 0x%x\n", bp, static_cast<int>(status));
     if (status == JXL_DEC_BASIC_INFO) {
       JxlBasicInfo info;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
       EXPECT_EQ(info.xsize, xsize);
       EXPECT_EQ(info.ysize, ysize);
       // Output buffer/callback not yet set
       EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
       size_t buffer_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
       EXPECT_EQ(pixels2.size(), buffer_size);
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetImageOutBuffer(dec, &format, pixels2.data(),
                                             pixels2.size()));
     } else if (status == JXL_DEC_FRAME) {
       // Nothing to do.
     } else if (status == JXL_DEC_SUCCESS) {
       EXPECT_EQ(bp + 1, breakpoints.size());
       break;
     } else if (status == JXL_DEC_NEED_MORE_INPUT ||
                status == JXL_DEC_FULL_IMAGE) {
       if (breakpoints[bp].expect_flush == NO_FLUSH) {
         EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
       } else {
         if (status != JXL_DEC_FULL_IMAGE) {
           EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
         }
         double dist = jxl::test::DistanceRMS(pixels2.data(), pixels.data(),
                                              xsize, ysize, format);
         if (breakpoints[bp].expect_flush == NEW_FLUSH) {
           EXPECT_LT(dist, prev_dist);
           prev_dist = dist;
         } else {
           EXPECT_EQ(dist, prev_dist);
         }
       }
       if (status == JXL_DEC_FULL_IMAGE) {
         EXPECT_EQ(bp + 1, breakpoints.size());
         continue;
       }
       ASSERT_LT(++bp, breakpoints.size());
       next_in += avail_in - JxlDecoderReleaseInput(dec);
       avail_in = breakpoints[bp].file_pos - (next_in - data.data());
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     } else {
       printf("Unexpected status: 0x%x\n", static_cast<int>(status));
       FAIL();  // unexpected returned status
     }
   }
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, ProgressionTest) {
   size_t xsize = 508;
   size_t ysize = 470;
   uint32_t num_channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.cparams.progressive_dc = 1;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   StreamPositions streampos;
   AnalyzeCodestream(data, &streampos);
   const std::vector<FramePositions>& fp = streampos.frames;
   // We have preview, dc frame and regular frame.
   EXPECT_EQ(3, fp.size());
   EXPECT_EQ(7, fp[2].section_end.size());
   EXPECT_EQ(data.size(), fp[2].section_end[6]);
   std::vector<Breakpoint> breakpoints{
       {fp[0].frame_start, NO_FLUSH},           // headers
       {fp[1].frame_start, NO_FLUSH},           // preview
       {fp[2].frame_start, NO_FLUSH},           // dc frame
       {fp[2].section_end[0], NO_FLUSH},        // DC global
       {fp[2].section_end[1] - 1, NO_FLUSH},    // partial DC group
       {fp[2].section_end[1], NEW_FLUSH},       // DC group
       {fp[2].section_end[2], SAME_FLUSH},      // AC global
       {fp[2].section_end[3], NEW_FLUSH},       // AC group 0
       {fp[2].section_end[4] - 1, SAME_FLUSH},  // partial AC group 1
       {fp[2].section_end[4], NEW_FLUSH},       // AC group 1
       {fp[2].section_end[5], NEW_FLUSH},       // AC group 2
       {data.size() - 1, SAME_FLUSH},           // partial AC group 3
       {data.size(), NEW_FLUSH}};               // full image
   VerifyProgression(xsize, ysize, num_channels, pixels, data, breakpoints);
 }
 
 TEST(DecodeTest, ProgressionTestLosslessAlpha) {
   size_t xsize = 508;
   size_t ysize = 470;
   uint32_t num_channels = 4;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   params.cparams.responsive = 1;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   StreamPositions streampos;
   AnalyzeCodestream(data, &streampos);
   const std::vector<FramePositions>& fp = streampos.frames;
   // We have preview, dc frame and regular frame.
   EXPECT_EQ(1, fp.size());
   EXPECT_EQ(7, fp[0].section_end.size());
   EXPECT_EQ(data.size(), fp[0].section_end[6]);
   std::vector<Breakpoint> breakpoints{
       {fp[0].frame_start, NO_FLUSH},           // headers
       {fp[0].section_end[0] - 1, NO_FLUSH},    // partial DC global
       {fp[0].section_end[0], NEW_FLUSH},       // DC global
       {fp[0].section_end[1], SAME_FLUSH},      // DC group
       {fp[0].section_end[2], SAME_FLUSH},      // AC global
       {fp[0].section_end[3], NEW_FLUSH},       // AC group 0
       {fp[0].section_end[4] - 1, SAME_FLUSH},  // partial AC group 1
       {fp[0].section_end[4], NEW_FLUSH},       // AC group 1
       {fp[0].section_end[5], NEW_FLUSH},       // AC group 2
       {data.size() - 1, SAME_FLUSH},           // partial AC group 3
       {data.size(), NEW_FLUSH}};               // full image
   VerifyProgression(xsize, ysize, num_channels, pixels, data, breakpoints);
 }
 
 void VerifyFilePosition(size_t expected_pos, const std::vector<uint8_t>& data,
                         JxlDecoder* dec) {
   size_t remaining = JxlDecoderReleaseInput(dec);
   size_t pos = data.size() - remaining;
   EXPECT_EQ(expected_pos, pos);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, data.data() + pos, remaining));
 }
 
 TEST(DecodeTest, InputHandlingTestOneShot) {
   size_t xsize = 508;
   size_t ysize = 470;
   uint32_t num_channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     printf("Testing with box format %d\n", i);
     jxl::TestCodestreamParams params;
     params.cparams.progressive_dc = 1;
     params.preview_mode = jxl::kSmallPreview;
     params.box_format = static_cast<CodeStreamBoxFormat>(i);
     std::vector<uint8_t> data =
         jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                      xsize, ysize, num_channels, params);
     JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     StreamPositions streampos;
     AnalyzeCodestream(data, &streampos);
     const std::vector<FramePositions>& fp = streampos.frames;
     // We have preview, dc frame and regular frame.
     EXPECT_EQ(3, fp.size());
 
     std::vector<uint8_t> pixels2;
     pixels2.resize(pixels.size());
 
     int kNumEvents = 6;
     int events[] = {
         JXL_DEC_BASIC_INFO, JXL_DEC_COLOR_ENCODING, JXL_DEC_PREVIEW_IMAGE,
         JXL_DEC_FRAME,      JXL_DEC_FULL_IMAGE,     JXL_DEC_FRAME_PROGRESSION,
     };
     size_t end_positions[] = {
         streampos.basic_info,     fp[0].frame_start,
         fp[1].frame_start,        fp[2].toc_end,
         streampos.codestream_end, streampos.codestream_end};
     int events_wanted = 0;
     for (int j = 0; j < kNumEvents; ++j) {
       events_wanted |= events[j];
       size_t end_pos = end_positions[j];
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events_wanted));
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetInput(dec, data.data(), data.size()));
       EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
       VerifyFilePosition(streampos.basic_info, data, dec);
       if (j >= 1) {
         EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[0].frame_start, data, dec);
       }
       if (j >= 2) {
         EXPECT_EQ(JXL_DEC_NEED_PREVIEW_OUT_BUFFER, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[0].toc_end, data, dec);
         size_t buffer_size;
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderPreviewOutBufferSize(dec, &format, &buffer_size));
         EXPECT_GE(pixels2.size(), buffer_size);
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetPreviewOutBuffer(dec, &format, pixels2.data(),
                                                 buffer_size));
         EXPECT_EQ(JXL_DEC_PREVIEW_IMAGE, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[1].frame_start, data, dec);
       }
       if (j >= 3) {
         EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[2].toc_end, data, dec);
         if (j >= 5) {
           EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetProgressiveDetail(dec, kDC));
         }
       }
       if (j >= 4) {
         EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[2].toc_end, data, dec);
         size_t buffer_size;
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
         EXPECT_EQ(pixels2.size(), buffer_size);
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetImageOutBuffer(dec, &format, pixels2.data(),
                                               pixels2.size()));
         if (j >= 5) {
           EXPECT_EQ(JXL_DEC_FRAME_PROGRESSION, JxlDecoderProcessInput(dec));
           VerifyFilePosition(fp[2].section_end[1], data, dec);
         }
         EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
         VerifyFilePosition(streampos.codestream_end, data, dec);
       }
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
       VerifyFilePosition(end_pos, data, dec);
       JxlDecoderDestroy(dec);
     }
   }
 }
 
 TEST(DecodeTest, JXL_TRANSCODE_JPEG_TEST(InputHandlingTestJPEGOneshot)) {
   TEST_LIBJPEG_SUPPORT();
   size_t xsize = 123;
   size_t ysize = 77;
   size_t channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, channels, /*seed=*/0);
   for (int i = 1; i < kCSBF_NUM_ENTRIES; ++i) {
     printf("Testing with box format %d\n", i);
     std::vector<uint8_t> jpeg_codestream;
     jxl::TestCodestreamParams params;
     params.cparams.color_transform = jxl::ColorTransform::kNone;
     params.jpeg_codestream = &jpeg_codestream;
     params.preview_mode = jxl::kSmallPreview;
     params.box_format = static_cast<CodeStreamBoxFormat>(i);
     std::vector<uint8_t> data =
         jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                      xsize, ysize, channels, params);
     JxlPixelFormat format = {3, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     StreamPositions streampos;
     AnalyzeCodestream(data, &streampos);
     const std::vector<FramePositions>& fp = streampos.frames;
     // We have preview and regular frame.
     EXPECT_EQ(2, fp.size());
     EXPECT_LT(0, streampos.jbrd_end);
 
     std::vector<uint8_t> pixels2;
     pixels2.resize(pixels.size());
 
     int kNumEvents = 6;
     int events[] = {JXL_DEC_BASIC_INFO,     JXL_DEC_JPEG_RECONSTRUCTION,
                     JXL_DEC_COLOR_ENCODING, JXL_DEC_PREVIEW_IMAGE,
                     JXL_DEC_FRAME,          JXL_DEC_FULL_IMAGE};
     size_t end_positions[] = {streampos.basic_info, streampos.basic_info,
                               fp[0].frame_start,    fp[1].frame_start,
                               fp[1].toc_end,        streampos.codestream_end};
     int events_wanted = 0;
     for (int j = 0; j < kNumEvents; ++j) {
       printf("j = %d\n", j);
       events_wanted |= events[j];
       size_t end_pos = end_positions[j];
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events_wanted));
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetInput(dec, data.data(), data.size()));
       if (j >= 1) {
         EXPECT_EQ(JXL_DEC_JPEG_RECONSTRUCTION, JxlDecoderProcessInput(dec));
         VerifyFilePosition(streampos.jbrd_end, data, dec);
       }
       EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
       VerifyFilePosition(streampos.basic_info, data, dec);
       if (j >= 2) {
         EXPECT_EQ(JXL_DEC_COLOR_ENCODING, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[0].frame_start, data, dec);
       }
       if (j >= 3) {
         EXPECT_EQ(JXL_DEC_NEED_PREVIEW_OUT_BUFFER, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[0].toc_end, data, dec);
         size_t buffer_size;
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderPreviewOutBufferSize(dec, &format, &buffer_size));
         EXPECT_GE(pixels2.size(), buffer_size);
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetPreviewOutBuffer(dec, &format, pixels2.data(),
                                                 buffer_size));
         EXPECT_EQ(JXL_DEC_PREVIEW_IMAGE, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[1].frame_start, data, dec);
       }
       if (j >= 4) {
         EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[1].toc_end, data, dec);
       }
       if (j >= 5) {
         EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
         VerifyFilePosition(fp[1].toc_end, data, dec);
         size_t buffer_size;
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
         EXPECT_EQ(pixels2.size(), buffer_size);
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetImageOutBuffer(dec, &format, pixels2.data(),
                                               pixels2.size()));
         EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
         VerifyFilePosition(streampos.codestream_end, data, dec);
       }
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
       VerifyFilePosition(end_pos, data, dec);
       JxlDecoderDestroy(dec);
     }
   }
 }
 
 TEST(DecodeTest, InputHandlingTestStreaming) {
   size_t xsize = 508;
   size_t ysize = 470;
   uint32_t num_channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   for (int i = 0; i < kCSBF_NUM_ENTRIES; ++i) {
     printf("Testing with box format %d\n", i);
     fflush(stdout);
     jxl::TestCodestreamParams params;
     params.cparams.progressive_dc = 1;
     params.box_format = static_cast<CodeStreamBoxFormat>(i);
     params.preview_mode = jxl::kSmallPreview;
     std::vector<uint8_t> data =
         jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                      xsize, ysize, num_channels, params);
     JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     StreamPositions streampos;
     AnalyzeCodestream(data, &streampos);
     const std::vector<FramePositions>& fp = streampos.frames;
     // We have preview, dc frame and regular frame.
     EXPECT_EQ(3, fp.size());
     std::vector<uint8_t> pixels2;
     pixels2.resize(pixels.size());
     int events_wanted =
         (JXL_DEC_BASIC_INFO | JXL_DEC_COLOR_ENCODING | JXL_DEC_PREVIEW_IMAGE |
          JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE | JXL_DEC_FRAME_PROGRESSION |
          JXL_DEC_BOX);
     for (size_t increment : {1, 7, 27, 1024}) {
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, events_wanted));
       size_t file_pos = 0;
       size_t box_index = 0;
       size_t avail_in = 0;
       for (;;) {
         const uint8_t* next_in = data.data() + file_pos;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
         JxlDecoderStatus status = JxlDecoderProcessInput(dec);
         size_t remaining = JxlDecoderReleaseInput(dec);
         size_t consumed = avail_in - remaining;
         file_pos += consumed;
         avail_in += increment;
         avail_in = std::min<size_t>(avail_in, data.size() - file_pos);
         if (status == JXL_DEC_BASIC_INFO) {
           EXPECT_EQ(file_pos, streampos.basic_info);
         } else if (status == JXL_DEC_COLOR_ENCODING) {
           EXPECT_EQ(file_pos, streampos.frames[0].frame_start);
         } else if (status == JXL_DEC_NEED_PREVIEW_OUT_BUFFER) {
           EXPECT_EQ(file_pos, streampos.frames[0].toc_end);
           size_t buffer_size;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderPreviewOutBufferSize(dec, &format, &buffer_size));
           EXPECT_GE(pixels2.size(), buffer_size);
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetPreviewOutBuffer(dec, &format, pixels2.data(),
                                                   buffer_size));
         } else if (status == JXL_DEC_PREVIEW_IMAGE) {
           EXPECT_EQ(file_pos, streampos.frames[1].frame_start);
         } else if (status == JXL_DEC_FRAME) {
           EXPECT_EQ(file_pos, streampos.frames[2].toc_end);
           EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetProgressiveDetail(dec, kDC));
         } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
           EXPECT_EQ(file_pos, streampos.frames[2].toc_end);
           size_t buffer_size;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
           EXPECT_EQ(pixels2.size(), buffer_size);
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetImageOutBuffer(dec, &format, pixels2.data(),
                                                 pixels2.size()));
         } else if (status == JXL_DEC_FRAME_PROGRESSION) {
           EXPECT_EQ(file_pos, streampos.frames[2].section_end[1]);
         } else if (status == JXL_DEC_FULL_IMAGE) {
           EXPECT_EQ(file_pos, streampos.codestream_end);
         } else if (status == JXL_DEC_SUCCESS) {
           EXPECT_EQ(file_pos, streampos.codestream_end);
           break;
         } else if (status == JXL_DEC_NEED_MORE_INPUT) {
           EXPECT_LT(remaining, 12);
           if ((i == kCSBF_None && file_pos >= 2) ||
               (box_index > 0 && box_index < streampos.box_start.size() &&
                file_pos >= streampos.box_start[box_index - 1] + 12 &&
                file_pos < streampos.box_start[box_index])) {
             EXPECT_EQ(remaining, 0);
           }
           if (file_pos == data.size()) break;
         } else if (status == JXL_DEC_BOX) {
           ASSERT_LT(box_index, streampos.box_start.size());
           EXPECT_EQ(file_pos, streampos.box_start[box_index++]);
         } else {
           printf("Unexpected status: 0x%x\n", static_cast<int>(status));
           FAIL();
         }
       }
       JxlDecoderDestroy(dec);
     }
   }
 }
 
 TEST(DecodeTest, FlushTest) {
   // Size large enough for multiple groups, required to have progressive
   // stages
   size_t xsize = 333;
   size_t ysize = 300;
   uint32_t num_channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   // Ensure that the first part contains at least the full DC of the image,
   // otherwise flush does not work.
   size_t first_part = data.size() - 1;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), first_part));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(info.xsize, xsize);
   EXPECT_EQ(info.ysize, ysize);
 
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
   // Output buffer not yet set
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
 
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   EXPECT_EQ(pixels2.size(), buffer_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &format, pixels2.data(), pixels2.size()));
 
   // Must process input further until we get JXL_DEC_NEED_MORE_INPUT, even if
   // data was already input before, since the processing of the frame only
   // happens at the JxlDecoderProcessInput call after JXL_DEC_FRAME.
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
 
   // Crude test of actual pixel data: pixel threshold of about 4% (2560/65535).
   // 29000 pixels can be above the threshold
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             29000u);
 
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   size_t consumed = first_part - JxlDecoderReleaseInput(dec);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data() + consumed,
                                                 data.size() - consumed));
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   // Lower threshold for the final (still lossy) image
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             11000u);
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, FlushTestImageOutCallback) {
   // Size large enough for multiple groups, required to have progressive
   // stages
   size_t xsize = 333;
   size_t ysize = 300;
   uint32_t num_channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   size_t bytes_per_pixel = format.num_channels * 2;
   size_t stride = bytes_per_pixel * xsize;
   auto callback = [&](size_t x, size_t y, size_t num_pixels,
                       const void* pixels_row) {
     memcpy(pixels2.data() + stride * y + bytes_per_pixel * x, pixels_row,
            num_pixels * bytes_per_pixel);
   };
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   // Ensure that the first part contains at least the full DC of the image,
   // otherwise flush does not work.
   size_t first_part = data.size() - 1;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), first_part));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(info.xsize, xsize);
   EXPECT_EQ(info.ysize, ysize);
 
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
   // Output callback not yet set
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutCallback(
                                  dec, &format,
                                  [](void* opaque, size_t x, size_t y,
                                     size_t xsize, const void* pixels_row) {
                                    auto cb =
                                        static_cast<decltype(&callback)>(opaque);
                                    (*cb)(x, y, xsize, pixels_row);
                                  },
                                  /*opaque=*/&callback));
 
   // Must process input further until we get JXL_DEC_NEED_MORE_INPUT, even if
   // data was already input before, since the processing of the frame only
   // happens at the JxlDecoderProcessInput call after JXL_DEC_FRAME.
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
 
   // Crude test of actual pixel data: pixel threshold of about 4% (2560/65535).
   // 29000 pixels can be above the threshold
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             29000u);
 
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   size_t consumed = first_part - JxlDecoderReleaseInput(dec);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data() + consumed,
                                                 data.size() - consumed));
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   // Lower threshold for the final (still lossy) image
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             11000u);
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, FlushTestLossyProgressiveAlpha) {
   // Size large enough for multiple groups, required to have progressive
   // stages
   size_t xsize = 333;
   size_t ysize = 300;
   uint32_t num_channels = 4;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   // Ensure that the first part contains at least the full DC of the image,
   // otherwise flush does not work.
   size_t first_part = data.size() - 1;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), first_part));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(info.xsize, xsize);
   EXPECT_EQ(info.ysize, ysize);
 
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
   // Output buffer not yet set
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
 
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   EXPECT_EQ(pixels2.size(), buffer_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &format, pixels2.data(), pixels2.size()));
 
   // Must process input further until we get JXL_DEC_NEED_MORE_INPUT, even if
   // data was already input before, since the processing of the frame only
   // happens at the JxlDecoderProcessInput call after JXL_DEC_FRAME.
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
 
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             30000u);
 
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   size_t consumed = first_part - JxlDecoderReleaseInput(dec);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data() + consumed,
                                                 data.size() - consumed));
 
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             11000u);
 
   JxlDecoderDestroy(dec);
 }
 TEST(DecodeTest, FlushTestLossyProgressiveAlphaUpsampling) {
   size_t xsize = 533;
   size_t ysize = 401;
   uint32_t num_channels = 4;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.cparams.resampling = 2;
   params.cparams.ec_resampling = 4;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   // Ensure that the first part contains at least the full DC of the image,
   // otherwise flush does not work.
   size_t first_part = data.size() * 2 / 3;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), first_part));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(info.xsize, xsize);
   EXPECT_EQ(info.ysize, ysize);
 
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
   // Output buffer not yet set
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
 
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   EXPECT_EQ(pixels2.size(), buffer_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &format, pixels2.data(), pixels2.size()));
 
   // Must process input further until we get JXL_DEC_NEED_MORE_INPUT, even if
   // data was already input before, since the processing of the frame only
   // happens at the JxlDecoderProcessInput call after JXL_DEC_FRAME.
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
 
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             125000u);
 
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   size_t consumed = first_part - JxlDecoderReleaseInput(dec);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data() + consumed,
                                                 data.size() - consumed));
 
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             70000u);
 
   JxlDecoderDestroy(dec);
 }
 TEST(DecodeTest, FlushTestLosslessProgressiveAlpha) {
   // Size large enough for multiple groups, required to have progressive
   // stages
   size_t xsize = 333;
   size_t ysize = 300;
   uint32_t num_channels = 4;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
   jxl::TestCodestreamParams params;
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   params.cparams.responsive = 1;
   params.cparams.modular_group_size_shift = 1;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> data =
       jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                    xsize, ysize, num_channels, params);
   JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
 
   std::vector<uint8_t> pixels2;
   pixels2.resize(pixels.size());
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME | JXL_DEC_FULL_IMAGE));
 
   // Ensure that the first part contains at least the full DC of the image,
   // otherwise flush does not work.
   size_t first_part = data.size() / 2;
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data(), first_part));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   JxlBasicInfo info;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
   EXPECT_EQ(info.xsize, xsize);
   EXPECT_EQ(info.ysize, ysize);
 
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
 
   // Output buffer not yet set
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderFlushImage(dec));
 
   size_t buffer_size;
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
   EXPECT_EQ(pixels2.size(), buffer_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                  dec, &format, pixels2.data(), pixels2.size()));
 
   // Must process input further until we get JXL_DEC_NEED_MORE_INPUT, even if
   // data was already input before, since the processing of the frame only
   // happens at the JxlDecoderProcessInput call after JXL_DEC_FRAME.
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
 
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format, 2560.0),
             2700u);
 
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
 
   size_t consumed = first_part - JxlDecoderReleaseInput(dec);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, data.data() + consumed,
                                                 data.size() - consumed));
 
   EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
   EXPECT_LE(jxl::test::ComparePixels(pixels2.data(), pixels.data(), xsize,
                                      ysize, format, format),
             0u);
 
   JxlDecoderDestroy(dec);
 }
 
 class DecodeProgressiveTest : public ::testing::TestWithParam<int> {};
 JXL_GTEST_INSTANTIATE_TEST_SUITE_P(DecodeProgressiveTestInstantiation,
                                    DecodeProgressiveTest,
                                    ::testing::Range(0, 8));
 TEST_P(DecodeProgressiveTest, ProgressiveEventTest) {
   const int params = GetParam();
   bool single_group = ((params & 1) != 0);
   bool lossless = (((params >> 1) & 1) != 0);
   uint32_t num_channels = 3 + ((params >> 2) & 1);
   bool has_alpha = ((num_channels & 1) == 0);
   std::set<JxlProgressiveDetail> progressive_details = {kDC, kLastPasses,
                                                         kPasses};
   for (auto prog_detail : progressive_details) {
     // Only few combinations are expected to support outputting
     // intermediate flushes for complete DC and complete passes.
     // The test can be updated if more cases are expected to support it.
     bool expect_flush = !has_alpha && !lossless;
     size_t xsize;
     size_t ysize;
     if (single_group) {
       // An image smaller than 256x256 ensures it contains only 1 group.
       xsize = 99;
       ysize = 100;
     } else {
       xsize = 277;
       ysize = 280;
     }
     std::vector<uint8_t> pixels =
         jxl::test::GetSomeTestImage(xsize, ysize, num_channels, 0);
     JxlPixelFormat format = {num_channels, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
     jxl::ColorEncoding color_encoding = jxl::ColorEncoding::SRGB(false);
     jxl::CodecInOut io;
     EXPECT_TRUE(jxl::ConvertFromExternal(
         jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, color_encoding,
         /*bits_per_sample=*/16, format,
         /*pool=*/nullptr, &io.Main()));
     jxl::TestCodestreamParams params;
     if (lossless) {
       params.cparams.SetLossless();
     } else {
       params.cparams.butteraugli_distance = 0.5f;
     }
     jxl::PassDefinition passes[] = {
         {2, 0, 4}, {4, 0, 4}, {8, 2, 2}, {8, 1, 2}, {8, 0, 1}};
     const int kNumPasses = 5;
     jxl::ProgressiveMode progressive_mode{passes};
     params.cparams.custom_progressive_mode = &progressive_mode;
     std::vector<uint8_t> data =
         jxl::CreateTestJXLCodestream(jxl::Bytes(pixels.data(), pixels.size()),
                                      xsize, ysize, num_channels, params);
 
     for (size_t increment : {static_cast<size_t>(1), data.size()}) {
       printf(
           "Testing with single_group=%s, lossless=%s, "
           "num_channels=%d, prog_detail=%d, increment=%d\n",
           BoolToCStr(single_group), BoolToCStr(lossless),
           static_cast<int>(num_channels), static_cast<int>(prog_detail),
           static_cast<int>(increment));
       std::vector<std::vector<uint8_t>> passes(kNumPasses + 1);
       for (int i = 0; i <= kNumPasses; ++i) {
         passes[i].resize(pixels.size());
       }
 
       JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSubscribeEvents(
                     dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME |
                              JXL_DEC_FULL_IMAGE | JXL_DEC_FRAME_PROGRESSION));
       EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSetProgressiveDetail(dec, kFrames));
       EXPECT_EQ(JXL_DEC_ERROR,
                 JxlDecoderSetProgressiveDetail(dec, kDCProgressive));
       EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSetProgressiveDetail(dec, kDCGroups));
       EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderSetProgressiveDetail(dec, kGroups));
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetProgressiveDetail(dec, prog_detail));
 
       uint8_t* next_in = data.data();
       size_t avail_in = 0;
       size_t pos = 0;
 
       auto process_input = [&]() {
         for (;;) {
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetInput(dec, next_in, avail_in));
           JxlDecoderStatus status = JxlDecoderProcessInput(dec);
           size_t remaining = JxlDecoderReleaseInput(dec);
           EXPECT_LE(remaining, avail_in);
           next_in += avail_in - remaining;
           avail_in = remaining;
           if (status == JXL_DEC_NEED_MORE_INPUT && pos < data.size()) {
             size_t chunk = std::min<size_t>(increment, data.size() - pos);
             pos += chunk;
             avail_in += chunk;
             continue;
           }
           return status;
         }
       };
 
       EXPECT_EQ(JXL_DEC_BASIC_INFO, process_input());
       JxlBasicInfo info;
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
       EXPECT_EQ(info.xsize, xsize);
       EXPECT_EQ(info.ysize, ysize);
 
       EXPECT_EQ(JXL_DEC_FRAME, process_input());
 
       size_t buffer_size;
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
       EXPECT_EQ(pixels.size(), buffer_size);
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                      dec, &format, passes[kNumPasses].data(),
                                      passes[kNumPasses].size()));
 
       auto next_pass = [&](int pass) {
         if (prog_detail <= kDC) return kNumPasses;
         if (prog_detail <= kLastPasses) {
           return std::min(pass + 2, kNumPasses);
         }
         return pass + 1;
       };
 
       if (expect_flush) {
         // Return a particular downsampling ratio only after the last
         // pass for that downsampling was processed.
         int expected_downsampling_ratios[] = {8, 8, 4, 4, 2};
         for (int p = 0; p < kNumPasses; p = next_pass(p)) {
           EXPECT_EQ(JXL_DEC_FRAME_PROGRESSION, process_input());
           EXPECT_EQ(expected_downsampling_ratios[p],
                     JxlDecoderGetIntendedDownsamplingRatio(dec));
           EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderFlushImage(dec));
           passes[p] = passes[kNumPasses];
         }
       }
 
       EXPECT_EQ(JXL_DEC_FULL_IMAGE, process_input());
       EXPECT_EQ(JXL_DEC_SUCCESS, process_input());
 
       JxlDecoderDestroy(dec);
 
       if (!expect_flush) {
         continue;
       }
       jxl::ButteraugliParams ba;
       std::vector<float> distances(kNumPasses + 1);
       for (int p = 0;; p = next_pass(p)) {
         jxl::CodecInOut io1;
         EXPECT_TRUE(jxl::ConvertFromExternal(
             jxl::Bytes(passes[p].data(), passes[p].size()), xsize, ysize,
             color_encoding,
             /*bits_per_sample=*/16, format,
             /*pool=*/nullptr, &io1.Main()));
         distances[p] = ButteraugliDistance(
             io.frames, io1.frames, ba, *JxlGetDefaultCms(), nullptr, nullptr);
         if (p == kNumPasses) break;
       }
       const float kMaxDistance[kNumPasses + 1] = {30.0f, 20.0f, 10.0f,
                                                   5.0f,  3.0f,  2.0f};
       EXPECT_LT(distances[kNumPasses], kMaxDistance[kNumPasses]);
       for (int p = 0; p < kNumPasses;) {
         int next_p = next_pass(p);
         EXPECT_LT(distances[p], kMaxDistance[p]);
         // Verify that the returned pass image is actually not the
         // same as the next pass image, by checking that it has a bit
         // worse butteraugli score.
         EXPECT_LT(distances[next_p] * 1.1f, distances[p]);
         p = next_p;
       }
     }
   }
 }
 
 void VerifyJPEGReconstruction(jxl::Span<const uint8_t> container,
                               jxl::Span<const uint8_t> jpeg_bytes) {
   JxlDecoderPtr dec = JxlDecoderMake(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(
                 dec.get(), JXL_DEC_JPEG_RECONSTRUCTION | JXL_DEC_FULL_IMAGE));
   JxlDecoderSetInput(dec.get(), container.data(), container.size());
   EXPECT_EQ(JXL_DEC_JPEG_RECONSTRUCTION, JxlDecoderProcessInput(dec.get()));
   std::vector<uint8_t> reconstructed_buffer(128);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetJPEGBuffer(dec.get(), reconstructed_buffer.data(),
                                     reconstructed_buffer.size()));
   size_t used = 0;
   JxlDecoderStatus process_result = JXL_DEC_JPEG_NEED_MORE_OUTPUT;
   while (process_result == JXL_DEC_JPEG_NEED_MORE_OUTPUT) {
     used = reconstructed_buffer.size() - JxlDecoderReleaseJPEGBuffer(dec.get());
     reconstructed_buffer.resize(reconstructed_buffer.size() * 2);
     EXPECT_EQ(
         JXL_DEC_SUCCESS,
         JxlDecoderSetJPEGBuffer(dec.get(), reconstructed_buffer.data() + used,
                                 reconstructed_buffer.size() - used));
     process_result = JxlDecoderProcessInput(dec.get());
   }
   ASSERT_EQ(JXL_DEC_FULL_IMAGE, process_result);
   used = reconstructed_buffer.size() - JxlDecoderReleaseJPEGBuffer(dec.get());
   ASSERT_EQ(used, jpeg_bytes.size());
   EXPECT_EQ(0, memcmp(reconstructed_buffer.data(), jpeg_bytes.data(), used));
 }
 
 TEST(DecodeTest, JXL_TRANSCODE_JPEG_TEST(JPEGReconstructTestCodestream)) {
   TEST_LIBJPEG_SUPPORT();
   size_t xsize = 123;
   size_t ysize = 77;
   size_t channels = 3;
   std::vector<uint8_t> pixels =
       jxl::test::GetSomeTestImage(xsize, ysize, channels, /*seed=*/0);
   std::vector<uint8_t> jpeg_codestream;
   jxl::TestCodestreamParams params;
   params.cparams.color_transform = jxl::ColorTransform::kNone;
   params.box_format = kCSBF_Single;
   params.jpeg_codestream = &jpeg_codestream;
   params.preview_mode = jxl::kSmallPreview;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, channels, params);
   VerifyJPEGReconstruction(jxl::Bytes(compressed), jxl::Bytes(jpeg_codestream));
 }
 
 TEST(DecodeTest, JXL_TRANSCODE_JPEG_TEST(JPEGReconstructionTest)) {
   const std::string jpeg_path = "jxl/flower/flower.png.im_q85_420.jpg";
   const std::vector<uint8_t> orig = jxl::test::ReadTestData(jpeg_path);
   jxl::CodecInOut orig_io;
   ASSERT_TRUE(jxl::jpeg::DecodeImageJPG(jxl::Bytes(orig), &orig_io));
   orig_io.metadata.m.xyb_encoded = false;
   jxl::BitWriter writer;
   ASSERT_TRUE(WriteCodestreamHeaders(&orig_io.metadata, &writer, nullptr));
   writer.ZeroPadToByte();
   jxl::CompressParams cparams;
   cparams.color_transform = jxl::ColorTransform::kNone;
   ASSERT_TRUE(jxl::EncodeFrame(cparams, jxl::FrameInfo{}, &orig_io.metadata,
                                orig_io.Main(), *JxlGetDefaultCms(),
                                /*pool=*/nullptr, &writer,
                                /*aux_out=*/nullptr));
 
   std::vector<uint8_t> jpeg_data;
   ASSERT_TRUE(
       EncodeJPEGData(*orig_io.Main().jpeg_data.get(), &jpeg_data, cparams));
   std::vector<uint8_t> container;
   jxl::Bytes(jxl::kContainerHeader).AppendTo(container);
   jxl::AppendBoxHeader(jxl::MakeBoxType("jbrd"), jpeg_data.size(), false,
                        &container);
   jxl::Bytes(jpeg_data).AppendTo(container);
   jxl::AppendBoxHeader(jxl::MakeBoxType("jxlc"), 0, true, &container);
   jxl::PaddedBytes codestream = std::move(writer).TakeBytes();
   jxl::Bytes(codestream).AppendTo(container);
   VerifyJPEGReconstruction(jxl::Bytes(container), jxl::Bytes(orig));
 }
 
 TEST(DecodeTest, JXL_TRANSCODE_JPEG_TEST(JPEGReconstructionMetadataTest)) {
   const std::string jpeg_path = "jxl/jpeg_reconstruction/1x1_exif_xmp.jpg";
   const std::string jxl_path = "jxl/jpeg_reconstruction/1x1_exif_xmp.jxl";
   const std::vector<uint8_t> jpeg = jxl::test::ReadTestData(jpeg_path);
   const std::vector<uint8_t> jxl = jxl::test::ReadTestData(jxl_path);
   VerifyJPEGReconstruction(jxl::Bytes(jxl), jxl::Bytes(jpeg));
 }
 
 TEST(DecodeTest, ContinueFinalNonEssentialBoxTest) {
   size_t xsize = 80;
   size_t ysize = 90;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   jxl::TestCodestreamParams params;
   params.box_format = kCSBF_Multi_Other_Terminated;
   params.add_icc_profile = true;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
   StreamPositions streampos;
   AnalyzeCodestream(compressed, &streampos);
 
   // The non-essential final box size including 8-byte header
   size_t final_box_size = unk3_box_size + 8;
   size_t last_box_begin = compressed.size() - final_box_size;
   // Verify that the test is indeed setup correctly to be at the beginning of
   // the 'unkn' box header.
   ASSERT_EQ(compressed[last_box_begin + 3], final_box_size);
   ASSERT_EQ(compressed[last_box_begin + 4], 'u');
   ASSERT_EQ(compressed[last_box_begin + 5], 'n');
   ASSERT_EQ(compressed[last_box_begin + 6], 'k');
   ASSERT_EQ(compressed[last_box_begin + 7], '3');
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec, JXL_DEC_BASIC_INFO | JXL_DEC_FRAME));
 
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, compressed.data(), last_box_begin));
 
   EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
   EXPECT_EQ(JXL_DEC_FRAME, JxlDecoderProcessInput(dec));
   // The decoder returns success despite not having seen the final unknown box
   // yet. This is because calling JxlDecoderCloseInput is not mandatory for
   // backwards compatibility, so it doesn't know more bytes follow, the current
   // bytes ended at a perfectly valid place.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   size_t remaining = JxlDecoderReleaseInput(dec);
   // Since the test was set up to end exactly at the boundary of the final
   // codestream box, and the decoder returned success, all bytes are expected to
   // be consumed until the end of the  frame header.
   EXPECT_EQ(remaining, last_box_begin - streampos.frames[0].toc_end);
 
   // Now set the remaining non-codestream box as input.
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSetInput(dec, compressed.data() + last_box_begin,
                                compressed.size() - last_box_begin));
   // Even though JxlDecoderProcessInput already returned JXL_DEC_SUCCESS before,
   // when calling it again now after setting more input, success is expected, no
   // event occurs but the box has been successfully skipped.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   JxlDecoderDestroy(dec);
 }
 
 namespace {
 bool BoxTypeEquals(const std::string& type_string, const JxlBoxType type) {
   return type_string.size() == 4 && type_string[0] == type[0] &&
          type_string[1] == type[1] && type_string[2] == type[2] &&
          type_string[3] == type[3];
 }
 }  // namespace
 
 TEST(DecodeTest, ExtentedBoxSizeTest) {
   const std::string jxl_path = "jxl/boxes/square-extended-size-container.jxl";
   const std::vector<uint8_t> orig = jxl::test::ReadTestData(jxl_path);
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, JXL_DEC_BOX));
 
   JxlBoxType type;
   uint64_t box_size;
   uint64_t contents_size;
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, orig.data(), orig.size()));
   EXPECT_EQ(JXL_DEC_BOX, JxlDecoderProcessInput(dec));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
   EXPECT_TRUE(BoxTypeEquals("JXL ", type));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeRaw(dec, &box_size));
   EXPECT_EQ(12, box_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeContents(dec, &contents_size));
   EXPECT_EQ(contents_size + 8, box_size);
   EXPECT_EQ(JXL_DEC_BOX, JxlDecoderProcessInput(dec));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
   EXPECT_TRUE(BoxTypeEquals("ftyp", type));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeRaw(dec, &box_size));
   EXPECT_EQ(20, box_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeContents(dec, &contents_size));
   EXPECT_EQ(contents_size + 8, box_size);
   EXPECT_EQ(JXL_DEC_BOX, JxlDecoderProcessInput(dec));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
   EXPECT_TRUE(BoxTypeEquals("jxlc", type));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeRaw(dec, &box_size));
   EXPECT_EQ(72, box_size);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeContents(dec, &contents_size));
   // This is an extended box, hence the difference between `box_size` and
   // `contents_size` is 16.
   EXPECT_EQ(contents_size + 8 + 8, box_size);
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, JXL_BOXES_TEST(BoxTest)) {
   size_t xsize = 1;
   size_t ysize = 1;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   jxl::TestCodestreamParams params;
   params.box_format = kCSBF_Multi_Other_Terminated;
   params.add_icc_profile = true;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, JXL_DEC_BOX));
 
   std::vector<std::string> expected_box_types = {
       "JXL ", "ftyp", "jxlp", "unk1", "unk2", "jxlp", "jxlp", "jxlp", "unk3"};
 
   // Value 0 means to not test the size: codestream is not required to be a
   // particular exact size.
   std::vector<size_t> expected_box_sizes = {12, 20, 0, 34, 18, 0, 0, 0, 20};
 
   JxlBoxType type;
   uint64_t box_size;
   uint64_t contents_size;
   std::vector<uint8_t> contents(50);
   size_t expected_release_size = 0;
 
   // Cannot get these when decoding didn't start yet
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderGetBoxSizeRaw(dec, &box_size));
 
   uint8_t* next_in = compressed.data();
   size_t avail_in = compressed.size();
   for (size_t i = 0; i < expected_box_types.size(); i++) {
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
     EXPECT_EQ(JXL_DEC_BOX, JxlDecoderProcessInput(dec));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxSizeRaw(dec, &box_size));
     EXPECT_TRUE(BoxTypeEquals(expected_box_types[i], type));
     if (expected_box_sizes[i]) {
       EXPECT_EQ(expected_box_sizes[i], box_size);
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderGetBoxSizeContents(dec, &contents_size));
       EXPECT_EQ(contents_size + 8, box_size);
     }
 
     if (expected_release_size > 0) {
       EXPECT_EQ(expected_release_size, JxlDecoderReleaseBoxBuffer(dec));
       expected_release_size = 0;
     }
 
     if (type[0] == 'u' && type[1] == 'n' && type[2] == 'k') {
       JxlDecoderSetBoxBuffer(dec, contents.data(), contents.size());
       size_t expected_box_contents_size =
           type[3] == '1' ? unk1_box_size
                          : (type[3] == '2' ? unk2_box_size : unk3_box_size);
       expected_release_size = contents.size() - expected_box_contents_size;
     }
     size_t consumed = avail_in - JxlDecoderReleaseInput(dec);
     next_in += consumed;
     avail_in -= consumed;
   }
 
   // After the last DEC_BOX event, check that the input position is exactly at
   // the stat of the box header.
   EXPECT_EQ(avail_in, expected_box_sizes.back());
 
   // Even though all input is given, the decoder cannot assume there aren't
   // more boxes if the input was not closed.
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec, next_in, avail_in));
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec));
   JxlDecoderCloseInput(dec);
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
 
   JxlDecoderDestroy(dec);
 }
 
 TEST(DecodeTest, JXL_BOXES_TEST(ExifBrobBoxTest)) {
   size_t xsize = 1;
   size_t ysize = 1;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   jxl::TestCodestreamParams params;
   // Lossless to verify pixels exactly after roundtrip.
   params.cparams.SetLossless();
   params.box_format = kCSBF_Brob_Exif;
   params.add_icc_profile = true;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   // Test raw brob box, not brotli-decompressing
   for (int streaming = 0; streaming < 2; ++streaming) {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, JXL_DEC_BOX));
     if (!streaming) {
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
       JxlDecoderCloseInput(dec);
     }
     // for streaming input case
     const uint8_t* next_in = compressed.data();
     size_t avail_in = 0;
     size_t total_in = 0;
     size_t step_size = 64;
 
     std::vector<uint8_t> box_buffer;
     size_t box_num_output;
     bool seen_brob_begin = false;
     bool seen_brob_end = false;
 
     for (;;) {
       JxlDecoderStatus status = JxlDecoderProcessInput(dec);
       if (status == JXL_DEC_NEED_MORE_INPUT) {
         if (streaming) {
           size_t remaining = JxlDecoderReleaseInput(dec);
           EXPECT_LE(remaining, avail_in);
           next_in += avail_in - remaining;
           avail_in = remaining;
           size_t amount = step_size;
           if (total_in + amount > compressed.size()) {
             amount = compressed.size() - total_in;
           }
           avail_in += amount;
           total_in += amount;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetInput(dec, next_in, avail_in));
           if (total_in == compressed.size()) JxlDecoderCloseInput(dec);
         } else {
           FAIL();
           break;
         }
       } else if (status == JXL_DEC_BOX || status == JXL_DEC_SUCCESS) {
         if (!box_buffer.empty()) {
           EXPECT_EQ(false, seen_brob_end);
           seen_brob_end = true;
           size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
           box_num_output = box_buffer.size() - remaining;
           EXPECT_EQ(box_num_output, box_brob_exif_size - 8);
           EXPECT_EQ(
               0, memcmp(box_buffer.data(), box_brob_exif + 8, box_num_output));
           box_buffer.clear();
         }
         if (status == JXL_DEC_SUCCESS) break;
         JxlBoxType type;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
         if (BoxTypeEquals("brob", type)) {
           EXPECT_EQ(false, seen_brob_begin);
           seen_brob_begin = true;
           box_buffer.resize(8);
           JxlDecoderSetBoxBuffer(dec, box_buffer.data(), box_buffer.size());
         }
       } else if (status == JXL_DEC_BOX_NEED_MORE_OUTPUT) {
         size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
         box_num_output = box_buffer.size() - remaining;
         box_buffer.resize(box_buffer.size() * 2);
         JxlDecoderSetBoxBuffer(dec, box_buffer.data() + box_num_output,
                                box_buffer.size() - box_num_output);
       } else {
         // We do not expect any other events or errors
         FAIL();
         break;
       }
     }
 
     EXPECT_EQ(true, seen_brob_begin);
     EXPECT_EQ(true, seen_brob_end);
 
     JxlDecoderDestroy(dec);
   }
 
   // Test decompressed brob box
   for (int streaming = 0; streaming < 2; ++streaming) {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSubscribeEvents(dec, JXL_DEC_BOX));
     if (!streaming) {
       EXPECT_EQ(JXL_DEC_SUCCESS,
                 JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
       JxlDecoderCloseInput(dec);
     }
     // for streaming input case
     const uint8_t* next_in = compressed.data();
     size_t avail_in = 0;
     size_t total_in = 0;
     size_t step_size = 64;
 
     std::vector<uint8_t> box_buffer;
     size_t box_num_output;
     bool seen_exif_begin = false;
     bool seen_exif_end = false;
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetDecompressBoxes(dec, JXL_TRUE));
 
     for (;;) {
       JxlDecoderStatus status = JxlDecoderProcessInput(dec);
       if (status == JXL_DEC_NEED_MORE_INPUT) {
         if (streaming) {
           size_t remaining = JxlDecoderReleaseInput(dec);
           EXPECT_LE(remaining, avail_in);
           next_in += avail_in - remaining;
           avail_in = remaining;
           size_t amount = step_size;
           if (total_in + amount > compressed.size()) {
             amount = compressed.size() - total_in;
           }
           avail_in += amount;
           total_in += amount;
           EXPECT_EQ(JXL_DEC_SUCCESS,
                     JxlDecoderSetInput(dec, next_in, avail_in));
           if (total_in == compressed.size()) JxlDecoderCloseInput(dec);
         } else {
           FAIL();
           break;
         }
       } else if (status == JXL_DEC_BOX || status == JXL_DEC_SUCCESS) {
         if (!box_buffer.empty()) {
           EXPECT_EQ(false, seen_exif_end);
           seen_exif_end = true;
           size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
           box_num_output = box_buffer.size() - remaining;
           // Expect that the output has the same size and contents as the
           // uncompressed exif data. Only check contents if the sizes match to
           // avoid comparing uninitialized memory in the test.
           EXPECT_EQ(box_num_output, exif_uncompressed_size);
           if (box_num_output == exif_uncompressed_size) {
             EXPECT_EQ(0, memcmp(box_buffer.data(), exif_uncompressed,
                                 exif_uncompressed_size));
           }
           box_buffer.clear();
         }
         if (status == JXL_DEC_SUCCESS) break;
         JxlBoxType type;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_TRUE));
         if (BoxTypeEquals("Exif", type)) {
           EXPECT_EQ(false, seen_exif_begin);
           seen_exif_begin = true;
           box_buffer.resize(8);
           JxlDecoderSetBoxBuffer(dec, box_buffer.data(), box_buffer.size());
         }
       } else if (status == JXL_DEC_BOX_NEED_MORE_OUTPUT) {
         size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
         box_num_output = box_buffer.size() - remaining;
         box_buffer.resize(box_buffer.size() * 2);
         JxlDecoderSetBoxBuffer(dec, box_buffer.data() + box_num_output,
                                box_buffer.size() - box_num_output);
       } else {
         // We do not expect any other events or errors
         FAIL();
         break;
       }
     }
 
     EXPECT_EQ(true, seen_exif_begin);
     EXPECT_EQ(true, seen_exif_end);
 
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, JXL_BOXES_TEST(PartialCodestreamBoxTest)) {
   size_t xsize = 23;
   size_t ysize = 81;
   std::vector<uint8_t> pixels = jxl::test::GetSomeTestImage(xsize, ysize, 4, 0);
   JxlPixelFormat format_orig = {4, JXL_TYPE_UINT16, JXL_BIG_ENDIAN, 0};
   // Lossless to verify pixels exactly after roundtrip.
   jxl::TestCodestreamParams params;
   params.cparams.SetLossless();
   params.cparams.speed_tier = jxl::SpeedTier::kThunder;
   params.box_format = kCSBF_Multi;
   params.add_icc_profile = true;
   std::vector<uint8_t> compressed = jxl::CreateTestJXLCodestream(
       jxl::Bytes(pixels.data(), pixels.size()), xsize, ysize, 4, params);
 
   std::vector<uint8_t> extracted_codestream;
 
   {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSubscribeEvents(
                   dec, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE | JXL_DEC_BOX));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
     JxlDecoderCloseInput(dec);
 
     size_t num_jxlp = 0;
 
     std::vector<uint8_t> pixels2;
     pixels2.resize(pixels.size());
 
     std::vector<uint8_t> box_buffer;
     size_t box_num_output;
 
     for (;;) {
       JxlDecoderStatus status = JxlDecoderProcessInput(dec);
       if (status == JXL_DEC_NEED_MORE_INPUT) {
         FAIL();
         break;
       } else if (status == JXL_DEC_BASIC_INFO) {
         JxlBasicInfo info;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
         EXPECT_EQ(info.xsize, xsize);
         EXPECT_EQ(info.ysize, ysize);
       } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetImageOutBuffer(dec, &format_orig, pixels2.data(),
                                               pixels2.size()));
       } else if (status == JXL_DEC_FULL_IMAGE) {
         continue;
       } else if (status == JXL_DEC_BOX || status == JXL_DEC_SUCCESS) {
         if (!box_buffer.empty()) {
           size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
           box_num_output = box_buffer.size() - remaining;
           EXPECT_GE(box_num_output, 4);
           // Do not insert the first 4 bytes, which are not part of the
           // codestream, but the partial codestream box index
           extracted_codestream.insert(extracted_codestream.end(),
                                       box_buffer.begin() + 4,
                                       box_buffer.begin() + box_num_output);
           box_buffer.clear();
         }
         if (status == JXL_DEC_SUCCESS) break;
         JxlBoxType type;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBoxType(dec, type, JXL_FALSE));
         if (BoxTypeEquals("jxlp", type)) {
           num_jxlp++;
           box_buffer.resize(8);
           JxlDecoderSetBoxBuffer(dec, box_buffer.data(), box_buffer.size());
         }
       } else if (status == JXL_DEC_BOX_NEED_MORE_OUTPUT) {
         size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
         box_num_output = box_buffer.size() - remaining;
         box_buffer.resize(box_buffer.size() * 2);
         JxlDecoderSetBoxBuffer(dec, box_buffer.data() + box_num_output,
                                box_buffer.size() - box_num_output);
       } else {
         // We do not expect any other events or errors
         FAIL();
         break;
       }
     }
 
     // The test file created with kCSBF_Multi is expected to have 4 jxlp boxes.
     EXPECT_EQ(4, num_jxlp);
 
     EXPECT_EQ(0u, jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                            ysize, format_orig, format_orig));
 
     JxlDecoderDestroy(dec);
   }
 
   // Now test whether the codestream extracted from the jxlp boxes can itself
   // also be decoded and gives the same pixels
   {
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSubscribeEvents(
                   dec, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE | JXL_DEC_BOX));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetInput(dec, extracted_codestream.data(),
                                  extracted_codestream.size()));
     JxlDecoderCloseInput(dec);
 
     size_t num_boxes = 0;
 
     std::vector<uint8_t> pixels2;
     pixels2.resize(pixels.size());
 
     std::vector<uint8_t> box_buffer;
     size_t box_num_output;
 
     for (;;) {
       JxlDecoderStatus status = JxlDecoderProcessInput(dec);
       if (status == JXL_DEC_NEED_MORE_INPUT) {
         FAIL();
         break;
       } else if (status == JXL_DEC_BASIC_INFO) {
         JxlBasicInfo info;
         EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &info));
         EXPECT_EQ(info.xsize, xsize);
         EXPECT_EQ(info.ysize, ysize);
       } else if (status == JXL_DEC_NEED_IMAGE_OUT_BUFFER) {
         EXPECT_EQ(JXL_DEC_SUCCESS,
                   JxlDecoderSetImageOutBuffer(dec, &format_orig, pixels2.data(),
                                               pixels2.size()));
       } else if (status == JXL_DEC_FULL_IMAGE) {
         continue;
       } else if (status == JXL_DEC_BOX) {
         num_boxes++;
       } else if (status == JXL_DEC_BOX_NEED_MORE_OUTPUT) {
         size_t remaining = JxlDecoderReleaseBoxBuffer(dec);
         box_num_output = box_buffer.size() - remaining;
         box_buffer.resize(box_buffer.size() * 2);
         JxlDecoderSetBoxBuffer(dec, box_buffer.data() + box_num_output,
                                box_buffer.size() - box_num_output);
       } else if (status == JXL_DEC_SUCCESS) {
         break;
       } else {
         // We do not expect any other events or errors
         FAIL();
         break;
       }
     }
 
     EXPECT_EQ(0, num_boxes);  // The data does not use the container format.
     EXPECT_EQ(0u, jxl::test::ComparePixels(pixels.data(), pixels2.data(), xsize,
                                            ysize, format_orig, format_orig));
 
     JxlDecoderDestroy(dec);
   }
 }
 
 TEST(DecodeTest, SpotColorTest) {
   jxl::CodecInOut io;
   size_t xsize = 55;
   size_t ysize = 257;
   io.metadata.m.color_encoding = jxl::ColorEncoding::LinearSRGB();
   JXL_ASSIGN_OR_DIE(Image3F main, Image3F::Create(xsize, ysize));
   JXL_ASSIGN_OR_DIE(ImageF spot, ImageF::Create(xsize, ysize));
   jxl::ZeroFillImage(&main);
   jxl::ZeroFillImage(&spot);
 
   for (size_t y = 0; y < ysize; y++) {
     float* JXL_RESTRICT rowm = main.PlaneRow(1, y);
     float* JXL_RESTRICT rows = spot.Row(y);
     for (size_t x = 0; x < xsize; x++) {
       rowm[x] = (x + y) * (1.f / 255.f);
       rows[x] = ((x ^ y) & 255) * (1.f / 255.f);
     }
   }
   io.SetFromImage(std::move(main), jxl::ColorEncoding::LinearSRGB());
   jxl::ExtraChannelInfo info;
   info.bit_depth.bits_per_sample = 8;
   info.dim_shift = 0;
   info.type = jxl::ExtraChannel::kSpotColor;
   info.spot_color[0] = 0.5f;
   info.spot_color[1] = 0.2f;
   info.spot_color[2] = 1.f;
   info.spot_color[3] = 0.5f;
 
   io.metadata.m.extra_channel_info.push_back(info);
   std::vector<ImageF> ec;
   ec.push_back(std::move(spot));
   io.frames[0].SetExtraChannels(std::move(ec));
 
   jxl::CompressParams cparams;
   cparams.speed_tier = jxl::SpeedTier::kLightning;
   cparams.modular_mode = true;
   cparams.color_transform = jxl::ColorTransform::kNone;
   cparams.butteraugli_distance = 0.f;
 
   std::vector<uint8_t> compressed;
   EXPECT_TRUE(jxl::test::EncodeFile(cparams, &io, &compressed));
 
   for (size_t render_spot = 0; render_spot < 2; render_spot++) {
     JxlPixelFormat format = {3, JXL_TYPE_UINT8, JXL_LITTLE_ENDIAN, 0};
 
     JxlDecoder* dec = JxlDecoderCreate(nullptr);
 
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSubscribeEvents(
                   dec, JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE));
     if (!render_spot) {
       EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetRenderSpotcolors(dec, JXL_FALSE));
     }
 
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetInput(dec, compressed.data(), compressed.size()));
     EXPECT_EQ(JXL_DEC_BASIC_INFO, JxlDecoderProcessInput(dec));
     JxlBasicInfo binfo;
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderGetBasicInfo(dec, &binfo));
     EXPECT_EQ(1u, binfo.num_extra_channels);
     EXPECT_EQ(xsize, binfo.xsize);
     EXPECT_EQ(ysize, binfo.ysize);
 
     JxlExtraChannelInfo extra_info;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderGetExtraChannelInfo(dec, 0, &extra_info));
     EXPECT_EQ(static_cast<unsigned int>(jxl::ExtraChannel::kSpotColor),
               extra_info.type);
 
     EXPECT_EQ(JXL_DEC_NEED_IMAGE_OUT_BUFFER, JxlDecoderProcessInput(dec));
     size_t buffer_size;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderImageOutBufferSize(dec, &format, &buffer_size));
     size_t extra_size;
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderExtraChannelBufferSize(dec, &format, &extra_size, 0));
 
     std::vector<uint8_t> image(buffer_size);
     std::vector<uint8_t> extra(extra_size);
     size_t bytes_per_pixel = format.num_channels *
                              jxl::test::GetDataBits(format.data_type) /
                              jxl::kBitsPerByte;
     size_t stride = bytes_per_pixel * binfo.xsize;
 
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetImageOutBuffer(
                                    dec, &format, image.data(), image.size()));
     EXPECT_EQ(JXL_DEC_SUCCESS,
               JxlDecoderSetExtraChannelBuffer(dec, &format, extra.data(),
                                               extra.size(), 0));
 
     EXPECT_EQ(JXL_DEC_FULL_IMAGE, JxlDecoderProcessInput(dec));
 
     // After the full image was output, JxlDecoderProcessInput should return
     // success to indicate all is done.
     EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderProcessInput(dec));
     JxlDecoderDestroy(dec);
 
     for (size_t y = 0; y < ysize; y++) {
       uint8_t* JXL_RESTRICT rowm = image.data() + stride * y;
       uint8_t* JXL_RESTRICT rows = extra.data() + xsize * y;
       for (size_t x = 0; x < xsize; x++) {
         if (!render_spot) {
           // if spot color isn't rendered, main image should be as we made it
           // (red and blue are all zeroes)
 
           EXPECT_EQ(rowm[x * 3 + 0], 0);
           EXPECT_EQ(rowm[x * 3 + 1], (x + y > 255 ? 255 : x + y));
           EXPECT_EQ(rowm[x * 3 + 2], 0);
         }
         if (render_spot) {
           // if spot color is rendered, expect red and blue to look like the
           // spot color channel
           EXPECT_LT(abs(rowm[x * 3 + 0] - (rows[x] * 0.25f)), 1);
           EXPECT_LT(abs(rowm[x * 3 + 2] - (rows[x] * 0.5f)), 1);
         }
         EXPECT_EQ(rows[x], ((x ^ y) & 255));
       }
     }
   }
 }
 
 TEST(DecodeTest, CloseInput) {
   std::vector<uint8_t> partial_file = {0xff};
 
   JxlDecoderPtr dec = JxlDecoderMake(nullptr);
   EXPECT_EQ(JXL_DEC_SUCCESS,
             JxlDecoderSubscribeEvents(dec.get(),
                                       JXL_DEC_BASIC_INFO | JXL_DEC_FULL_IMAGE));
   EXPECT_EQ(JXL_DEC_SUCCESS, JxlDecoderSetInput(dec.get(), partial_file.data(),
                                                 partial_file.size()));
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec.get()));
   EXPECT_EQ(JXL_DEC_NEED_MORE_INPUT, JxlDecoderProcessInput(dec.get()));
   JxlDecoderCloseInput(dec.get());
   EXPECT_EQ(JXL_DEC_ERROR, JxlDecoderProcessInput(dec.get()));
 }