| 1 | // Copyright 2022 Google Inc. All Rights Reserved. |
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| 2 | // |
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| 3 | // Use of this source code is governed by a BSD-style license |
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| 4 | // that can be found in the COPYING file in the root of the source |
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| 5 | // tree. An additional intellectual property rights grant can be found |
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| 6 | // in the file PATENTS. All contributing project authors may |
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| 7 | // be found in the AUTHORS file in the root of the source tree. |
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| 8 | // ----------------------------------------------------------------------------- |
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| 9 | // |
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| 10 | // Gamma correction utilities. |
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| 11 | |
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| 12 | #ifndef WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
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| 13 | #define WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
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| 14 | |
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| 15 | #include "sharpyuv/sharpyuv.h" |
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| 16 | #include "src/webp/types.h" |
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| 17 | |
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| 18 | #ifdef __cplusplus |
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| 19 | extern "C" { |
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| 20 | #endif |
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| 21 | |
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| 22 | // Initializes precomputed tables. Must be called once before calling |
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| 23 | // SharpYuvGammaToLinear or SharpYuvLinearToGamma. |
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| 24 | void SharpYuvInitGammaTables(void); |
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| 25 | |
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| 26 | // Converts a 'bit_depth'-bit gamma color value to a 16-bit linear value. |
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| 27 | uint32_t SharpYuvGammaToLinear(uint16_t v, int bit_depth, |
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| 28 | SharpYuvTransferFunctionType transfer_type); |
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| 29 | |
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| 30 | // Converts a 16-bit linear color value to a 'bit_depth'-bit gamma value. |
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| 31 | uint16_t SharpYuvLinearToGamma(uint32_t value, int bit_depth, |
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| 32 | SharpYuvTransferFunctionType transfer_type); |
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| 33 | |
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| 34 | #ifdef __cplusplus |
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| 35 | } // extern "C" |
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| 36 | #endif |
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| 37 | |
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| 38 | #endif // WEBP_SHARPYUV_SHARPYUV_GAMMA_H_ |
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| 39 | |
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