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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 GrPipelineInput_DEFINED
#define GrPipelineInput_DEFINED
#include "GrColor.h"
/**
* This describes the color or coverage input that will be seen by the first color or coverage stage
* of a GrPipeline. This is also the GrPrimitiveProcessor color or coverage *output*.
*/
struct GrPipelineInput {
enum class Opaque {
kNo,
kYes,
};
GrPipelineInput(Opaque opaque = Opaque::kNo)
: fFlags(opaque == Opaque::kYes ? kIsOpaque_Flag : 0) {}
GrPipelineInput(GrColor color) : fFlags(kColorIsKnown_Flag), fColor(color) {}
void setToConstant(GrColor color) {
fColor = color;
if (GrColorIsOpaque(color)) {
fFlags = kColorIsKnown_Flag | kIsOpaque_Flag;
} else {
fFlags = kColorIsKnown_Flag;
}
}
void setToUnknown() { fFlags = 0; }
void setToUnknownOpaque() { fFlags = kIsOpaque_Flag; }
void setToSolidCoverage() {
fColor = GrColor_WHITE;
fFlags = kColorIsKnown_Flag | kIsOpaque_Flag;
}
void setToScalar(uint8_t alpha) {
this->setToConstant(GrColorPackRGBA(alpha, alpha, alpha, alpha));
}
void setToLCDCoverage() { fFlags = kIsLCDCoverage_Flag; }
bool isLCDCoverage() const { return SkToBool(kIsLCDCoverage_Flag & fFlags); }
bool isOpaque() const { return SkToBool(kIsOpaque_Flag & fFlags); }
bool isSolidWhite() const { return (kColorIsKnown_Flag & fFlags) && GrColor_WHITE == fColor; }
bool isConstant(GrColor* color) const {
if (kColorIsKnown_Flag & fFlags) {
*color = fColor;
return true;
}
return false;
}
private:
enum Flags {
kColorIsKnown_Flag = 0x1,
kIsOpaque_Flag = 0x2,
kIsLCDCoverage_Flag = 0x4,
};
uint32_t fFlags;
GrColor fColor;
};
#endif
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