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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrProcOptInfo_DEFINED
#define GrProcOptInfo_DEFINED
#include "GrColor.h"
#include "GrInvariantOutput.h"
class GrDrawBatch;
class GrFragmentProcessor;
class GrPrimitiveProcessor;
/**
* GrProcOptInfo gathers invariant data from a set of processor stages.It is used to recognize
* optimizations related to eliminating stages and vertex attributes that aren't necessary for a
* draw.
*/
class GrProcOptInfo {
public:
GrProcOptInfo()
: fInOut(0, static_cast<GrColorComponentFlags>(0), false)
, fFirstEffectiveProcessorIndex(0)
, fInputColorIsUsed(true)
, fInputColor(0) {}
void calcWithInitialValues(const GrFragmentProcessor* const *, int cnt, GrColor startColor,
GrColorComponentFlags, bool areCoverageStages, bool isLCD = false);
void initUsingInvariantOutput(GrInitInvariantOutput invOutput);
void completeCalculations(const GrFragmentProcessor * const processors[], int cnt);
bool isSolidWhite() const { return fInOut.isSolidWhite(); }
bool isOpaque() const { return fInOut.isOpaque(); }
bool isSingleComponent() const { return fInOut.isSingleComponent(); }
bool allStagesMultiplyInput() const { return fInOut.allStagesMulInput(); }
// TODO: Once texture pixel configs quaries are updated, we no longer need this function.
// For now this function will correctly tell us if we are using LCD text or not and should only
// be called when looking at the coverage output.
bool isFourChannelOutput() const { return !fInOut.isSingleComponent() &&
fInOut.isLCDCoverage(); }
GrColor color() const { return fInOut.color(); }
GrColorComponentFlags validFlags() const {
return fInOut.validFlags();
}
/**
* Returns the index of the first effective color processor. If an intermediate processor
* doesn't read its input or has a known output, then we can ignore all earlier processors
* since they will not affect the final output. Thus the first effective processors index is
* the index to the first processor that will have an effect on the final output.
*
* If processors before the firstEffectiveProcessorIndex() are removed, corresponding values
* from inputColorIsUsed(), inputColorToEffectiveProcessor(), removeVertexAttribs(), and
* readsDst() must be used when setting up the draw to ensure correct drawing.
*/
int firstEffectiveProcessorIndex() const { return fFirstEffectiveProcessorIndex; }
/**
* True if the first effective processor reads its input, false otherwise.
*/
bool inputColorIsUsed() const { return fInputColorIsUsed; }
/**
* If input color is used and per-vertex colors are not used, this is the input color to the
* first effective processor.
*/
GrColor inputColorToFirstEffectiveProccesor() const { return fInputColor; }
private:
void internalCalc(const GrFragmentProcessor* const[], int cnt);
GrInvariantOutput fInOut;
int fFirstEffectiveProcessorIndex;
bool fInputColorIsUsed;
GrColor fInputColor;
};
#endif
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