libjxl

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dec_context_map.h (829B)

      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_DEC_CONTEXT_MAP_H_
      7 #define LIB_JXL_DEC_CONTEXT_MAP_H_
      8 
      9 #include <stddef.h>
     10 #include <stdint.h>
     11 
     12 #include <vector>
     13 
     14 #include "lib/jxl/dec_bit_reader.h"
     15 
     16 namespace jxl {
     17 
     18 // Context map uses uint8_t.
     19 constexpr size_t kMaxClusters = 256;
     20 
     21 // Reads the context map from the bit stream. On calling this function,
     22 // context_map->size() must be the number of possible context ids.
     23 // Sets *num_htrees to the number of different histogram ids in
     24 // *context_map.
     25 Status DecodeContextMap(std::vector<uint8_t>* context_map, size_t* num_htrees,
     26                         BitReader* input);
     27 
     28 }  // namespace jxl
     29 
     30 #endif  // LIB_JXL_DEC_CONTEXT_MAP_H_