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Diffstat (limited to 'third_party/jpeg-xl/lib/jpegli/entropy_coding.h')
-rw-r--r-- | third_party/jpeg-xl/lib/jpegli/entropy_coding.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/third_party/jpeg-xl/lib/jpegli/entropy_coding.h b/third_party/jpeg-xl/lib/jpegli/entropy_coding.h new file mode 100644 index 0000000000..6d9dd2303b --- /dev/null +++ b/third_party/jpeg-xl/lib/jpegli/entropy_coding.h @@ -0,0 +1,45 @@ +// 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_JPEGLI_ENTROPY_CODING_H_ +#define LIB_JPEGLI_ENTROPY_CODING_H_ + +/* clang-format off */ +#include <stdio.h> +#include <jpeglib.h> +/* clang-format on */ + +#include <vector> + +#include "lib/jpegli/encode_internal.h" + +namespace jpegli { + +void CopyHuffmanCodes(j_compress_ptr cinfo, bool* is_baseline); + +size_t RestartIntervalForScan(j_compress_ptr cinfo, size_t scan_index); + +struct Histogram { + int count[kJpegHuffmanAlphabetSize]; + Histogram() { memset(count, 0, sizeof(count)); } +}; + +struct JpegClusteredHistograms { + std::vector<Histogram> histograms; + std::vector<uint32_t> histogram_indexes; + std::vector<uint32_t> slot_ids; +}; + +void ClusterJpegHistograms(const Histogram* histograms, size_t num, + JpegClusteredHistograms* clusters); + +void AddJpegHuffmanCode(const Histogram& histogram, size_t slot_id, + JPEGHuffmanCode* huff_codes, size_t* num_huff_codes); + +void OptimizeHuffmanCodes(j_compress_ptr cinfo, bool* is_baseline); + +} // namespace jpegli + +#endif // LIB_JPEGLI_ENTROPY_CODING_H_ |