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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkColorSpaceXform_DEFINED
#define SkColorSpaceXform_DEFINED
#include "SkImageInfo.h"
class SkColorSpace;
class SK_API SkColorSpaceXform : SkNoncopyable {
public:
/**
* Create an object to handle color space conversions.
*
* @param srcSpace The encoded color space.
* @param dstSpace The destination color space.
*
*/
static std::unique_ptr<SkColorSpaceXform> New(SkColorSpace* srcSpace, SkColorSpace* dstSpace);
enum ColorFormat {
kRGBA_8888_ColorFormat,
kBGRA_8888_ColorFormat,
// Unsigned, big-endian, 16-bit integer
kRGB_U16_BE_ColorFormat, // Src only
kRGBA_U16_BE_ColorFormat, // Src only
kRGBA_F16_ColorFormat,
kRGBA_F32_ColorFormat,
kBGR_565_ColorFormat, // Dst only, kOpaque only
};
/**
* Apply the color conversion to a |src| buffer, storing the output in the |dst| buffer.
*
* F16 and F32 are only supported when the color space is linear. This function will return
* false in unsupported cases.
*
* @param dst Stored in the format described by |dstColorFormat|
* @param src Stored in the format described by |srcColorFormat|
* @param len Number of pixels in the buffers
* @param dstColorFormat Describes color format of |dst|
* @param srcColorFormat Describes color format of |src|
* @param alphaType Describes alpha properties of the |dst| (and |src|)
* kUnpremul preserves input alpha values
* kPremul performs a premultiplication and also preserves alpha values
* kOpaque optimization hint, |dst| alphas set to 1
*
*/
virtual bool apply(ColorFormat dstFormat, void* dst, ColorFormat srcFormat, const void* src,
int count, SkAlphaType alphaType) const = 0;
virtual ~SkColorSpaceXform() {}
enum AlphaOp {
kPreserve_AlphaOp, // just transfer src-alpha to dst-alpha
kPremul_AlphaOp, // like kPreserve, but multiplies RGB by it
kSrcIsOpaque_AlphaOp, // src alphas are all 1, this is a perf hint
};
static bool Apply(SkColorSpace* dstCS, ColorFormat dstFormat, void* dst,
SkColorSpace* srcCS, ColorFormat srcFormat, const void* src,
int count, AlphaOp);
protected:
SkColorSpaceXform() {}
};
#endif
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