/src/libjxl/lib/jxl/entropy_coder.h
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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_ENTROPY_CODER_H_ |
7 | | #define LIB_JXL_ENTROPY_CODER_H_ |
8 | | |
9 | | #include <jxl/memory_manager.h> |
10 | | |
11 | | #include <cstddef> |
12 | | #include <cstdint> |
13 | | |
14 | | #include "lib/jxl/ac_context.h" |
15 | | #include "lib/jxl/base/compiler_specific.h" |
16 | | #include "lib/jxl/base/status.h" |
17 | | #include "lib/jxl/dec_bit_reader.h" |
18 | | #include "lib/jxl/field_encodings.h" |
19 | | |
20 | | // Entropy coding and context modeling of DC and AC coefficients, as well as AC |
21 | | // strategy and quantization field. |
22 | | |
23 | | namespace jxl { |
24 | | |
25 | | static JXL_INLINE int32_t PredictFromTopAndLeft( |
26 | | const int32_t* const JXL_RESTRICT row_top, |
27 | 804 | const int32_t* const JXL_RESTRICT row, size_t x, int32_t default_val) { |
28 | 804 | if (x == 0) { |
29 | 804 | return row_top == nullptr ? default_val : row_top[x]; |
30 | 804 | } |
31 | 0 | if (row_top == nullptr) { |
32 | 0 | return row[x - 1]; |
33 | 0 | } |
34 | 0 | return (row_top[x] + row[x - 1] + 1) / 2; |
35 | 0 | } Unexecuted instantiation: dec_frame.cc:jxl::PredictFromTopAndLeft(int const*, int const*, unsigned long, int) Unexecuted instantiation: dec_group.cc:jxl::PredictFromTopAndLeft(int const*, int const*, unsigned long, int) Unexecuted instantiation: entropy_coder.cc:jxl::PredictFromTopAndLeft(int const*, int const*, unsigned long, int) Unexecuted instantiation: enc_context_map.cc:jxl::PredictFromTopAndLeft(int const*, int const*, unsigned long, int) enc_entropy_coder.cc:jxl::PredictFromTopAndLeft(int const*, int const*, unsigned long, int) Line | Count | Source | 27 | 804 | const int32_t* const JXL_RESTRICT row, size_t x, int32_t default_val) { | 28 | 804 | if (x == 0) { | 29 | 804 | return row_top == nullptr ? default_val : row_top[x]; | 30 | 804 | } | 31 | 0 | if (row_top == nullptr) { | 32 | 0 | return row[x - 1]; | 33 | 0 | } | 34 | 0 | return (row_top[x] + row[x - 1] + 1) / 2; | 35 | 0 | } |
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36 | | |
37 | | static constexpr U32Enc kDCThresholdDist(Bits(4), BitsOffset(8, 16), |
38 | | BitsOffset(16, 272), |
39 | | BitsOffset(32, 65808)); |
40 | | |
41 | | static constexpr U32Enc kQFThresholdDist(Bits(2), BitsOffset(3, 4), |
42 | | BitsOffset(5, 12), BitsOffset(8, 44)); |
43 | | |
44 | | Status DecodeBlockCtxMap(JxlMemoryManager* memory_manager, BitReader* br, |
45 | | BlockCtxMap* block_ctx_map); |
46 | | |
47 | | } // namespace jxl |
48 | | |
49 | | #endif // LIB_JXL_ENTROPY_CODER_H_ |