forked from Green-Sky/tomato
Green Sky
67653bbe50
git-subtree-dir: external/libwebp/libwebp git-subtree-split: dd7364c3cefe0f5c0b3c18c3b1887d353f90fc1f
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// 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_
|