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60 lines
1.8 KiB
60 lines
1.8 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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// Colorspace utilities. |
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#ifndef WEBP_SHARPYUV_SHARPYUV_CSP_H_ |
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#define WEBP_SHARPYUV_SHARPYUV_CSP_H_ |
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#include "sharpyuv/sharpyuv.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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// Range of YUV values. |
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typedef enum { |
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kSharpYuvRangeFull, // YUV values between [0;255] (for 8 bit) |
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kSharpYuvRangeLimited // Y in [16;235], YUV in [16;240] (for 8 bit) |
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} SharpYuvRange; |
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// Constants that define a YUV color space. |
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typedef struct { |
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// Kr and Kb are defined such that: |
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// Y = Kr * r + Kg * g + Kb * b where Kg = 1 - Kr - Kb. |
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float kr; |
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float kb; |
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int bit_depth; // 8, 10 or 12 |
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SharpYuvRange range; |
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} SharpYuvColorSpace; |
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// Fills in 'matrix' for the given YUVColorSpace. |
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SHARPYUV_EXTERN void SharpYuvComputeConversionMatrix( |
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const SharpYuvColorSpace* yuv_color_space, |
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SharpYuvConversionMatrix* matrix); |
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// Enums for precomputed conversion matrices. |
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typedef enum { |
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kSharpYuvMatrixWebp = 0, |
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kSharpYuvMatrixRec601Limited, |
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kSharpYuvMatrixRec601Full, |
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kSharpYuvMatrixRec709Limited, |
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kSharpYuvMatrixRec709Full, |
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kSharpYuvMatrixNum |
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} SharpYuvMatrixType; |
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// Returns a pointer to a matrix for one of the predefined colorspaces. |
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SHARPYUV_EXTERN const SharpYuvConversionMatrix* SharpYuvGetConversionMatrix( |
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SharpYuvMatrixType matrix_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_CSP_H_
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