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25d94f473b
This is inspired by https://github.com/AOMediaCodec/libavif/pull/444/files Change-Id: I98fae61696b3b8bbc1b5941e7950810d3ac3d588
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
// Copyright 2022 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// Gamma correction utilities.
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#ifndef WEBP_SHARPYUV_SHARPYUV_GAMMA_H_
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#define WEBP_SHARPYUV_SHARPYUV_GAMMA_H_
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#include "sharpyuv/sharpyuv.h"
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#include "src/webp/types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Initializes precomputed tables. Must be called once before calling
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// SharpYuvGammaToLinear or SharpYuvLinearToGamma.
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void SharpYuvInitGammaTables(void);
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// Converts a 'bit_depth'-bit gamma color value to a 16-bit linear value.
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uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth,
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SharpYuvTransferFunctionType transfer_type);
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// Converts a 16-bit linear color value to a 'bit_depth'-bit gamma value.
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uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth,
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SharpYuvTransferFunctionType transfer_type);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_
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