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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 SkGammaColorFilter_DEFINED
#define SkGammaColorFilter_DEFINED
#include "SkColorFilter.h"
#include "SkRefCnt.h"
// This colorfilter can be used to perform pixel-by-pixel conversion between linear and
// power-law color spaces. A gamma of 2.2 is interpreted to mean convert from sRGB to linear
// while a gamma of 1/2.2 is interpreted to mean convert from linear to sRGB. Any other
// values are just directly applied (i.e., out = in^gamma)
//
// More complicated color space mapping (i.e., ICC profiles) should be handled via the
// SkColorSpace object.
class SK_API SkGammaColorFilter : public SkColorFilter {
public:
static sk_sp<SkColorFilter> Make(SkScalar gamma);
void filterSpan(const SkPMColor src[], int count, SkPMColor[]) const override;
#if SK_SUPPORT_GPU
sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext*, SkColorSpace*) const override;
#endif
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaColorFilter)
protected:
void flatten(SkWriteBuffer&) const override;
private:
SkGammaColorFilter(SkScalar gamma);
SkScalar fGamma;
typedef SkColorFilter INHERITED;
};
#endif
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