1*b2055c35SXin Li // Copyright 2023 Google Inc. All Rights Reserved. 2*b2055c35SXin Li // 3*b2055c35SXin Li // Use of this source code is governed by a BSD-style license 4*b2055c35SXin Li // that can be found in the COPYING file in the root of the source 5*b2055c35SXin Li // tree. An additional intellectual property rights grant can be found 6*b2055c35SXin Li // in the file PATENTS. All contributing project authors may 7*b2055c35SXin Li // be found in the AUTHORS file in the root of the source tree. 8*b2055c35SXin Li // ----------------------------------------------------------------------------- 9*b2055c35SXin Li // 10*b2055c35SXin Li // Precomputed data for 420 risk estimation. 11*b2055c35SXin Li 12*b2055c35SXin Li #ifndef WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_ 13*b2055c35SXin Li #define WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_ 14*b2055c35SXin Li 15*b2055c35SXin Li #include "src/webp/types.h" 16*b2055c35SXin Li 17*b2055c35SXin Li extern const int kSharpYuvPrecomputedRiskYuvSampling; 18*b2055c35SXin Li // Table of precomputed risk scores when chroma subsampling images with two 19*b2055c35SXin Li // given colors. 20*b2055c35SXin Li // Since precomputing values for all possible YUV colors would create a huge 21*b2055c35SXin Li // table, the YUV space (i.e. [0, 255]^3) is reduced to 22*b2055c35SXin Li // [0, kSharpYuvPrecomputedRiskYuvSampling-1]^3 23*b2055c35SXin Li // where 255 maps to kSharpYuvPrecomputedRiskYuvSampling-1. 24*b2055c35SXin Li // Table size: kSharpYuvPrecomputedRiskYuvSampling^6 bytes or 114 KiB 25*b2055c35SXin Li extern const uint8_t kSharpYuvPrecomputedRisk[]; 26*b2055c35SXin Li 27*b2055c35SXin Li #endif // WEBP_EXTRAS_SHARPYUV_RISK_TABLE_H_ 28