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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 SkLinearBitmapPipeline_DEFINED
#define SkLinearBitmapPipeline_DEFINED
#include "SkColor.h"
#include "SkImageInfo.h"
#include "SkMatrix.h"
#include "SkNx.h"
#include "SkShader.h"
class SkLinearBitmapPipeline {
public:
SkLinearBitmapPipeline(
const SkMatrix& inverse,
SkFilterQuality filterQuality,
SkShader::TileMode xTile, SkShader::TileMode yTile,
float postAlpha,
const SkPixmap& srcPixmap);
~SkLinearBitmapPipeline();
void shadeSpan4f(int x, int y, SkPM4f* dst, int count);
template<typename Base, size_t kSize>
class PolymorphicUnion {
public:
PolymorphicUnion() : fIsInitialized{false} {}
~PolymorphicUnion() {
if (fIsInitialized) {
this->get()->~Base();
}
}
template<typename Variant, typename... Args>
void Initialize(Args&&... args) {
SkASSERTF(sizeof(Variant) <= sizeof(fSpace),
"Size Variant: %d, Space: %d", sizeof(Variant), sizeof(fSpace));
new(&fSpace) Variant(std::forward<Args>(args)...);
fIsInitialized = true;
};
Base* get() const { return reinterpret_cast<Base*>(&fSpace); }
Base* operator->() const { return this->get(); }
Base& operator*() const { return *(this->get()); }
private:
struct SK_STRUCT_ALIGN(16) Space {
char space[kSize];
};
bool fIsInitialized;
mutable Space fSpace;
};
class PointProcessorInterface;
class BilerpProcessorInterface;
class PixelPlacerInterface;
// These values were generated by the assert above in PolymorphicUnion.
using MatrixStage = PolymorphicUnion<PointProcessorInterface, 160>;
using TileStage = PolymorphicUnion<PointProcessorInterface, 160>;
using SampleStage = PolymorphicUnion<BilerpProcessorInterface, 80>;
using PixelStage = PolymorphicUnion<PixelPlacerInterface, 80>;
private:
PointProcessorInterface* fFirstStage;
MatrixStage fMatrixStage;
TileStage fTiler;
SampleStage fSampleStage;
PixelStage fPixelStage;
};
#endif // SkLinearBitmapPipeline_DEFINED
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