| // 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 "src/webp/types.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_ |
