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Diffstat (limited to '')
-rw-r--r-- | third_party/jpeg-xl/lib/jxl/enc_context_map.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jxl/enc_context_map.h b/third_party/jpeg-xl/lib/jxl/enc_context_map.h new file mode 100644 index 0000000000..041e71de7a --- /dev/null +++ b/third_party/jpeg-xl/lib/jxl/enc_context_map.h @@ -0,0 +1,35 @@ +// 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 <stddef.h> +#include <stdint.h> + +#include <vector> + +#include "lib/jxl/ac_context.h" +#include "lib/jxl/enc_bit_writer.h" + +namespace jxl { + +struct AuxOut; + +// 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. +void EncodeContextMap(const std::vector<uint8_t>& context_map, + size_t num_histograms, BitWriter* writer, size_t layer, + AuxOut* aux_out); + +void EncodeBlockCtxMap(const BlockCtxMap& block_ctx_map, BitWriter* writer, + AuxOut* aux_out); +} // namespace jxl + +#endif // LIB_JXL_ENC_CONTEXT_MAP_H_ |