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38 lines
1.3 KiB
38 lines
1.3 KiB
// 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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