| 1 | // Copyright 2022 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 | // Gamma correction utilities. |
| 11 | |
| 12 | #ifndef WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
| 13 | #define WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
| 14 | |
| 15 | #include "sharpyuv/sharpyuv.h" |
| 16 | #include "src/webp/types.h" |
| 17 | |
| 18 | #ifdef __cplusplus |
| 19 | extern "C"{ |
| 20 | #endif |
| 21 | |
| 22 | // Initializes precomputed tables. Must be called once before calling |
| 23 | // SharpYuvGammaToLinear or SharpYuvLinearToGamma. |
| 24 | void SharpYuvInitGammaTables(void); |
| 25 | |
| 26 | // Converts a 'bit_depth'-bit gamma color value to a 16-bit linear value. |
| 27 | uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth, |
| 28 | SharpYuvTransferFunctionType transfer_type); |
| 29 | |
| 30 | // Converts a 16-bit linear color value to a 'bit_depth'-bit gamma value. |
| 31 | uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth, |
| 32 | SharpYuvTransferFunctionType transfer_type); |
| 33 | |
| 34 | #ifdef __cplusplus |
| 35 | } // extern "C" |
| 36 | #endif |
| 37 | |
| 38 | #endif // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
| 39 |