| 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 "src/webp/types.h" |
|---|
| 16 | |
|---|
| 17 | #ifdef __cplusplus |
|---|
| 18 | extern "C" { |
|---|
| 19 | #endif |
|---|
| 20 | |
|---|
| 21 | // Initializes precomputed tables. Must be called once before calling |
|---|
| 22 | // SharpYuvGammaToLinear or SharpYuvLinearToGamma. |
|---|
| 23 | void SharpYuvInitGammaTables(void); |
|---|
| 24 | |
|---|
| 25 | // Converts a gamma color value on 'bit_depth' bits to a 16 bit linear value. |
|---|
| 26 | uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth); |
|---|
| 27 | |
|---|
| 28 | // Converts a 16 bit linear color value to a gamma value on 'bit_depth' bits. |
|---|
| 29 | uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth); |
|---|
| 30 | |
|---|
| 31 | #ifdef __cplusplus |
|---|
| 32 | } // extern "C" |
|---|
| 33 | #endif |
|---|
| 34 | |
|---|
| 35 | #endif // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
|---|
| 36 | |
|---|
