enc_context_map.h - mozsearch

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// 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.

#ifndef LIB_JXL_ENC_CONTEXT_MAP_H_

#define LIB_JXL_ENC_CONTEXT_MAP_H_

#include <cstddef>

#include <cstdint>

#include <vector>

#include "lib/jxl/ac_context.h"

#include "lib/jxl/base/status.h"

#include "lib/jxl/enc_bit_writer.h"

namespace jxl {

struct AuxOut;

enum class LayerType : uint8_t;

// Max limit is 255 because encoding assumes numbers < 255

// More clusters can help compression, but makes encode/decode somewhat slower

static const size_t kClustersLimit = 128;

// Encodes the given context map to the bit stream. The number of different

// histogram ids is given by num_histograms.

Status EncodeContextMap(const std::vector<uint8_t>& context_map,

                        size_t num_histograms, BitWriter* writer,

                        LayerType layer, AuxOut* aux_out);

Status EncodeBlockCtxMap(const BlockCtxMap& block_ctx_map, BitWriter* writer,

                         AuxOut* aux_out);

}  // namespace jxl

#endif  // LIB_JXL_ENC_CONTEXT_MAP_H_