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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 Sk4fGradientBase_DEFINED
#define Sk4fGradientBase_DEFINED
#include "Sk4fGradientPriv.h"
#include "SkColor.h"
#include "SkGradientShaderPriv.h"
#include "SkMatrix.h"
#include "SkNx.h"
#include "SkPM4f.h"
#include "SkShaderBase.h"
#include "SkTArray.h"
struct Sk4fGradientInterval {
Sk4fGradientInterval(const Sk4f& c0, SkScalar t0,
const Sk4f& c1, SkScalar t1);
bool contains(SkScalar t) const {
// True if t is in [p0,p1]. Note: this helper assumes a
// natural/increasing interval - so it's not usable in Sk4fLinearGradient.
SkASSERT(fT0 < fT1);
return t >= fT0 && t <= fT1;
}
// Color bias and color gradient, such that for a t in this interval
//
// C = fCb + t * fCg;
SkPM4f fCb, fCg;
SkScalar fT0, fT1;
};
class Sk4fGradientIntervalBuffer {
public:
void init(const SkColor colors[], const SkScalar pos[], int count,
SkShader::TileMode tileMode, bool premulColors, SkScalar alpha, bool reverse);
const Sk4fGradientInterval* find(SkScalar t) const;
const Sk4fGradientInterval* findNext(SkScalar t, const Sk4fGradientInterval* prev,
bool increasing) const;
using BufferType = SkSTArray<8, Sk4fGradientInterval, true>;
const BufferType* operator->() const { return &fIntervals; }
private:
BufferType fIntervals;
};
class SkGradientShaderBase::
GradientShaderBase4fContext : public Context {
public:
GradientShaderBase4fContext(const SkGradientShaderBase&,
const ContextRec&);
uint32_t getFlags() const override { return fFlags; }
void shadeSpan(int x, int y, SkPMColor dst[], int count) override;
void shadeSpan4f(int x, int y, SkPM4f dst[], int count) override;
bool isValid() const;
protected:
virtual void mapTs(int x, int y, SkScalar ts[], int count) const = 0;
Sk4fGradientIntervalBuffer fIntervals;
SkMatrix fDstToPos;
SkMatrix::MapXYProc fDstToPosProc;
uint8_t fDstToPosClass;
uint8_t fFlags;
bool fDither;
bool fColorsArePremul;
private:
using INHERITED = Context;
void addMirrorIntervals(const SkGradientShaderBase&,
const Sk4f& componentScale, bool reverse);
template<DstType, ApplyPremul, SkShader::TileMode tileMode>
class TSampler;
template <DstType dstType, ApplyPremul premul>
void shadePremulSpan(int x, int y, typename DstTraits<dstType, premul>::Type[],
int count) const;
template <DstType dstType, ApplyPremul premul, SkShader::TileMode tileMode>
void shadeSpanInternal(int x, int y, typename DstTraits<dstType, premul>::Type[],
int count) const;
};
#endif // Sk4fGradientBase_DEFINED
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