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66 lines
2.1 KiB
C
66 lines
2.1 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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// 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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// WebP's matrix, similar but not identical to kSharpYuvMatrixRec601Limited
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kSharpYuvMatrixWebp = 0,
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// Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeLimited
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kSharpYuvMatrixRec601Limited,
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// Kr=0.2990f Kb=0.1140f bit_depth=8 range=kSharpYuvRangeFull
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kSharpYuvMatrixRec601Full,
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// Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeLimited
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kSharpYuvMatrixRec709Limited,
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// Kr=0.2126f Kb=0.0722f bit_depth=8 range=kSharpYuvRangeFull
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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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