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
19extern "C" {
20#endif
21
22// Initializes precomputed tables. Must be called once before calling
23// SharpYuvGammaToLinear or SharpYuvLinearToGamma.
24void SharpYuvInitGammaTables(void);
25
26// Converts a 'bit_depth'-bit gamma color value to a 16-bit linear value.
27uint32_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.
31uint16_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

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source code of qtimageformats/src/3rdparty/libwebp/sharpyuv/sharpyuv_gamma.h