libjxl

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enc_huffman.h (759B)

      1 // Copyright (c) the JPEG XL Project Authors. All rights reserved.
      2 //
      3 // Use of this source code is governed by a BSD-style
      4 // license that can be found in the LICENSE file.
      5 
      6 #ifndef LIB_JXL_ENC_HUFFMAN_H_
      7 #define LIB_JXL_ENC_HUFFMAN_H_
      8 
      9 #include "lib/jxl/enc_bit_writer.h"
     10 
     11 namespace jxl {
     12 
     13 // Builds a Huffman tree for the given histogram, and encodes it into writer
     14 // in a format that can be read by HuffmanDecodingData::ReadFromBitstream.
     15 // An allotment for `writer` must already have been created by the caller.
     16 void BuildAndStoreHuffmanTree(const uint32_t* histogram, size_t length,
     17                               uint8_t* depth, uint16_t* bits,
     18                               BitWriter* writer);
     19 
     20 }  // namespace jxl
     21 
     22 #endif  // LIB_JXL_ENC_HUFFMAN_H_