// Copyright 2022 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // Gamma correction utilities. #ifndef WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ #define WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ #include <stdint.h> #ifdef __cplusplus extern "C" { #endif // Initializes precomputed tables. Must be called once before calling // SharpYuvGammaToLinear or SharpYuvLinearToGamma. void SharpYuvInitGammaTables(void); // Converts a gamma color value on 'bit_depth' bits to a 16 bit linear value. uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth); // Converts a 16 bit linear color value to a gamma value on 'bit_depth' bits. uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth); #ifdef __cplusplus } // extern "C" #endif #endif // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_