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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkArithmeticMode.h"
#include "SkColorPriv.h"
#include "SkNx.h"
#include "SkReadBuffer.h"
#include "SkString.h"
#include "SkUnPreMultiply.h"
#include "SkWriteBuffer.h"
#if SK_SUPPORT_GPU
#include "SkArithmeticMode_gpu.h"
#endif
class SkArithmeticMode_scalar : public SkXfermode {
public:
SkArithmeticMode_scalar(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4,
bool enforcePMColor) {
fK[0] = k1;
fK[1] = k2;
fK[2] = k3;
fK[3] = k4;
fEnforcePMColor = enforcePMColor;
}
void xfer32(SkPMColor[], const SkPMColor[], int count, const SkAlpha[]) const override;
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkArithmeticMode_scalar)
#if SK_SUPPORT_GPU
const GrFragmentProcessor* getFragmentProcessorForImageFilter(
const GrFragmentProcessor* dst) const override;
GrXPFactory* asXPFactory() const override;
#endif
private:
void flatten(SkWriteBuffer& buffer) const override {
buffer.writeScalar(fK[0]);
buffer.writeScalar(fK[1]);
buffer.writeScalar(fK[2]);
buffer.writeScalar(fK[3]);
buffer.writeBool(fEnforcePMColor);
}
SkScalar fK[4];
bool fEnforcePMColor;
friend class SkArithmeticMode;
typedef SkXfermode INHERITED;
};
sk_sp<SkFlattenable> SkArithmeticMode_scalar::CreateProc(SkReadBuffer& buffer) {
const SkScalar k1 = buffer.readScalar();
const SkScalar k2 = buffer.readScalar();
const SkScalar k3 = buffer.readScalar();
const SkScalar k4 = buffer.readScalar();
const bool enforcePMColor = buffer.readBool();
return SkArithmeticMode::Make(k1, k2, k3, k4, enforcePMColor);
}
void SkArithmeticMode_scalar::xfer32(SkPMColor dst[], const SkPMColor src[],
int count, const SkAlpha aaCoverage[]) const {
const Sk4f k1 = fK[0] * (1/255.0f),
k2 = fK[1],
k3 = fK[2],
k4 = fK[3] * 255.0f + 0.5f;
auto pin = [](float min, const Sk4f& val, float max) {
return Sk4f::Max(min, Sk4f::Min(val, max));
};
for (int i = 0; i < count; i++) {
if (aaCoverage && aaCoverage[i] == 0) {
continue;
}
Sk4f s = SkNx_cast<float>(Sk4b::Load(src+i)),
d = SkNx_cast<float>(Sk4b::Load(dst+i)),
r = pin(0, k1*s*d + k2*s + k3*d + k4, 255);
if (fEnforcePMColor) {
Sk4f a = SkNx_shuffle<3,3,3,3>(r);
r = Sk4f::Min(a, r);
}
if (aaCoverage && aaCoverage[i] != 255) {
Sk4f c = aaCoverage[i] * (1/255.0f);
r = d + (r-d)*c;
}
SkNx_cast<uint8_t>(r).store(dst+i);
}
}
#ifndef SK_IGNORE_TO_STRING
void SkArithmeticMode_scalar::toString(SkString* str) const {
str->append("SkArithmeticMode_scalar: ");
for (int i = 0; i < 4; ++i) {
str->appendScalar(fK[i]);
str->append(" ");
}
str->appendS32(fEnforcePMColor ? 1 : 0);
}
#endif
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkXfermode> SkArithmeticMode::Make(SkScalar k1, SkScalar k2, SkScalar k3, SkScalar k4,
bool enforcePMColor) {
if (SkScalarNearlyZero(k1) && SkScalarNearlyEqual(k2, SK_Scalar1) &&
SkScalarNearlyZero(k3) && SkScalarNearlyZero(k4)) {
return SkXfermode::Make(SkXfermode::kSrc_Mode);
} else if (SkScalarNearlyZero(k1) && SkScalarNearlyZero(k2) &&
SkScalarNearlyEqual(k3, SK_Scalar1) && SkScalarNearlyZero(k4)) {
return SkXfermode::Make(SkXfermode::kDst_Mode);
}
return sk_make_sp<SkArithmeticMode_scalar>(k1, k2, k3, k4, enforcePMColor);
}
//////////////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
const GrFragmentProcessor* SkArithmeticMode_scalar::getFragmentProcessorForImageFilter(
const GrFragmentProcessor* dst) const {
return GrArithmeticFP::Create(SkScalarToFloat(fK[0]),
SkScalarToFloat(fK[1]),
SkScalarToFloat(fK[2]),
SkScalarToFloat(fK[3]),
fEnforcePMColor,
dst);
}
GrXPFactory* SkArithmeticMode_scalar::asXPFactory() const {
return GrArithmeticXPFactory::Create(SkScalarToFloat(fK[0]),
SkScalarToFloat(fK[1]),
SkScalarToFloat(fK[2]),
SkScalarToFloat(fK[3]),
fEnforcePMColor);
}
#endif
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
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