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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrEffectStage_DEFINED
#define GrEffectStage_DEFINED
#include "GrBackendEffectFactory.h"
#include "GrEffect.h"
#include "SkMatrix.h"
#include "GrTypes.h"
#include "SkShader.h"
class GrEffectStage {
public:
GrEffectStage()
: fEffect (NULL) {
GR_DEBUGCODE(fSavedCoordChangeCnt = 0;)
}
~GrEffectStage() {
GrSafeUnref(fEffect);
GrAssert(0 == fSavedCoordChangeCnt);
}
bool operator ==(const GrEffectStage& other) const {
// first handle cases where one or the other has no effect
if (NULL == fEffect) {
return NULL == other.fEffect;
} else if (NULL == other.fEffect) {
return false;
}
if (fEffect->getFactory() != other.fEffect->getFactory()) {
return false;
}
if (!fEffect->isEqual(*other.fEffect)) {
return false;
}
return fCoordChangeMatrix == other.fCoordChangeMatrix;
}
bool operator !=(const GrEffectStage& s) const { return !(*this == s); }
GrEffectStage& operator =(const GrEffectStage& other) {
GrSafeAssign(fEffect, other.fEffect);
if (NULL != fEffect) {
fCoordChangeMatrix = other.fCoordChangeMatrix;
}
return *this;
}
/**
* This is called when the coordinate system in which the geometry is specified will change.
*
* @param matrix The transformation from the old coord system to the new one.
*/
void preConcatCoordChange(const SkMatrix& matrix) { fCoordChangeMatrix.preConcat(matrix); }
class SavedCoordChange {
private:
SkMatrix fCoordChangeMatrix;
GR_DEBUGCODE(mutable SkAutoTUnref<const GrEffect> fEffect;)
friend class GrEffectStage;
};
/**
* This gets the current coordinate system change. It is the accumulation of
* preConcatCoordChange calls since the effect was installed. It is used when then caller
* wants to temporarily change the source geometry coord system, draw something, and then
* restore the previous coord system (e.g. temporarily draw in device coords).
*/
void saveCoordChange(SavedCoordChange* savedCoordChange) const {
savedCoordChange->fCoordChangeMatrix = fCoordChangeMatrix;
GrAssert(NULL == savedCoordChange->fEffect.get());
GR_DEBUGCODE(GrSafeRef(fEffect);)
GR_DEBUGCODE(savedCoordChange->fEffect.reset(fEffect);)
GR_DEBUGCODE(++fSavedCoordChangeCnt);
}
/**
* This balances the saveCoordChange call.
*/
void restoreCoordChange(const SavedCoordChange& savedCoordChange) {
fCoordChangeMatrix = savedCoordChange.fCoordChangeMatrix;
GrAssert(savedCoordChange.fEffect.get() == fEffect);
GR_DEBUGCODE(--fSavedCoordChangeCnt);
GR_DEBUGCODE(savedCoordChange.fEffect.reset(NULL);)
}
/**
* Gets the matrix representing all changes of coordinate system since the GrEffect was
* installed in the stage.
*/
const SkMatrix& getCoordChangeMatrix() const { return fCoordChangeMatrix; }
void reset() {
GrSafeSetNull(fEffect);
}
const GrEffect* setEffect(const GrEffect* effect) {
GrAssert(0 == fSavedCoordChangeCnt);
GrSafeAssign(fEffect, effect);
fCoordChangeMatrix.reset();
return effect;
}
const GrEffect* getEffect() const { return fEffect; }
private:
SkMatrix fCoordChangeMatrix;
const GrEffect* fEffect;
GR_DEBUGCODE(mutable int fSavedCoordChangeCnt;)
};
#endif
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