sharpyuv_risk_table.h (1179B)
1 // Copyright 2023 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Precomputed data for 420 risk estimation. 11 12 #ifndef WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_ 13 #define WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_ 14 15 #include "src/webp/types.h" 16 17 extern const int kSharpYuvPrecomputedRiskYuvSampling; 18 // Table of precomputed risk scores when chroma subsampling images with two 19 // given colors. 20 // Since precomputing values for all possible YUV colors would create a huge 21 // table, the YUV space (i.e. [0, 255]^3) is reduced to 22 // [0, kSharpYuvPrecomputedRiskYuvSampling-1]^3 23 // where 255 maps to kSharpYuvPrecomputedRiskYuvSampling-1. 24 // Table size: kSharpYuvPrecomputedRiskYuvSampling^6 bytes or 114 KiB 25 extern const uint8_t kSharpYuvPrecomputedRisk[]; 26 27 #endif // WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_