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 |