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// Copyright 2022 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Colorspace utilities.
#ifndef WEBP_SHARPYUV_SHARPYUV_CSP_H_
#define WEBP_SHARPYUV_SHARPYUV_CSP_H_
#include "sharpyuv/sharpyuv.h"
#ifdef __cplusplus
extern "C" {
#endif
// Range of YUV values.
typedef enum {
kSharpYuvRangeFull, // YUV values between [0;255] (for 8 bit)
kSharpYuvRangeLimited // Y in [16;235], YUV in [16;240] (for 8 bit)
} SharpYuvRange;
// Constants that define a YUV color space.
typedef struct {
// Kr and Kb are defined such that:
// Y = Kr * r + Kg * g + Kb * b where Kg = 1 - Kr - Kb.
float kr;
float kb;
int bit_depth; // 8, 10 or 12
SharpYuvRange range;
} SharpYuvColorSpace;
// Fills in 'matrix' for the given YUVColorSpace.
SHARPYUV_EXTERN void SharpYuvComputeConversionMatrix(
const SharpYuvColorSpace* yuv_color_space,
SharpYuvConversionMatrix* matrix);
// Enums for precomputed conversion matrices.
typedef enum {
kSharpYuvMatrixWebp = 0,
kSharpYuvMatrixRec601Limited,
kSharpYuvMatrixRec601Full,
kSharpYuvMatrixRec709Limited,
kSharpYuvMatrixRec709Full,
kSharpYuvMatrixNum
} SharpYuvMatrixType;
// Returns a pointer to a matrix for one of the predefined colorspaces.
SHARPYUV_EXTERN const SharpYuvConversionMatrix* SharpYuvGetConversionMatrix(
SharpYuvMatrixType matrix_type);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_SHARPYUV_SHARPYUV_CSP_H_