sharpyuv_gamma.h - mozsearch

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// 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 "sharpyuv/sharpyuv.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 'bit_depth'-bit gamma color value to a 16-bit linear value.

uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth,

                               SharpYuvTransferFunctionType transfer_type);

// Converts a 16-bit linear color value to a 'bit_depth'-bit gamma value.

uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth,

                               SharpYuvTransferFunctionType transfer_type);

#ifdef __cplusplus

}  // extern "C"

#endif

#endif  // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_