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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorFilter.h"
#include "SkColorSpaceXformer.h"
#include "SkColorSpaceXform_Base.h"
#include "SkDrawLooper.h"
#include "SkGradientShader.h"
#include "SkImage_Base.h"
#include "SkImageFilter.h"
#include "SkImagePriv.h"
#include "SkMakeUnique.h"
std::unique_ptr<SkColorSpaceXformer> SkColorSpaceXformer::Make(sk_sp<SkColorSpace> dst) {
std::unique_ptr<SkColorSpaceXform> fromSRGB = SkColorSpaceXform_Base::New(
SkColorSpace::MakeSRGB().get(), dst.get(), SkTransferFunctionBehavior::kIgnore);
if (!fromSRGB) {
return nullptr;
}
auto xformer = std::unique_ptr<SkColorSpaceXformer>(new SkColorSpaceXformer());
xformer->fDst = std::move(dst);
xformer->fFromSRGB = std::move(fromSRGB);
return xformer;
}
sk_sp<SkImage> SkColorSpaceXformer::apply(const SkImage* src) {
return src->makeColorSpace(fDst, SkTransferFunctionBehavior::kIgnore);
}
sk_sp<SkImage> SkColorSpaceXformer::apply(const SkBitmap& src) {
sk_sp<SkImage> image = SkMakeImageFromRasterBitmap(src, kNever_SkCopyPixelsMode);
if (!image) {
return nullptr;
}
sk_sp<SkImage> xformed = image->makeColorSpace(fDst, SkTransferFunctionBehavior::kIgnore);
// We want to be sure we don't let the kNever_SkCopyPixelsMode image escape this stack frame.
SkASSERT(xformed != image);
return xformed;
}
// As far as I know, SkModeColorFilter is the only color filter that holds a color.
sk_sp<SkColorFilter> SkColorSpaceXformer::apply(const SkColorFilter* colorFilter) {
SkColor color;
SkBlendMode mode;
if (colorFilter->asColorMode(&color, &mode)) {
return SkColorFilter::MakeModeFilter(this->apply(color), mode);
}
return sk_ref_sp(const_cast<SkColorFilter*>(colorFilter));
}
void SkColorSpaceXformer::apply(SkColor* xformed, const SkColor* srgb, int n) {
SkAssertResult(fFromSRGB->apply(SkColorSpaceXform::kBGRA_8888_ColorFormat, xformed,
SkColorSpaceXform::kBGRA_8888_ColorFormat, srgb,
n, kUnpremul_SkAlphaType));
}
SkColor SkColorSpaceXformer::apply(SkColor srgb) {
SkColor xformed;
this->apply(&xformed, &srgb, 1);
return xformed;
}
// TODO: Is this introspection going to be enough, or do we need a new SkShader method?
sk_sp<SkShader> SkColorSpaceXformer::apply(const SkShader* shader) {
SkColor color;
if (shader->isConstant() && shader->asLuminanceColor(&color)) {
return SkShader::MakeColorShader(this->apply(color));
}
SkShader::TileMode xy[2];
SkMatrix local;
if (auto img = shader->isAImage(&local, xy)) {
return this->apply(img)->makeShader(xy[0], xy[1], &local);
}
SkShader::ComposeRec compose;
if (shader->asACompose(&compose)) {
auto A = this->apply(compose.fShaderA),
B = this->apply(compose.fShaderB);
if (A && B) {
return SkShader::MakeComposeShader(std::move(A), std::move(B), compose.fBlendMode);
}
}
SkShader::GradientInfo gradient;
sk_bzero(&gradient, sizeof(gradient));
if (auto type = shader->asAGradient(&gradient)) {
SkSTArray<8, SkColor> colors(gradient.fColorCount);
SkSTArray<8, SkScalar> pos(gradient.fColorCount);
gradient.fColors = colors.begin();
gradient.fColorOffsets = pos.begin();
shader->asAGradient(&gradient);
SkSTArray<8, SkColor> xformed(gradient.fColorCount);
this->apply(xformed.begin(), gradient.fColors, gradient.fColorCount);
switch (type) {
case SkShader::kNone_GradientType:
case SkShader::kColor_GradientType:
SkASSERT(false); // Should be unreachable.
break;
case SkShader::kLinear_GradientType:
return SkGradientShader::MakeLinear(gradient.fPoint,
xformed.begin(),
gradient.fColorOffsets,
gradient.fColorCount,
gradient.fTileMode,
gradient.fGradientFlags,
&shader->getLocalMatrix());
case SkShader::kRadial_GradientType:
return SkGradientShader::MakeRadial(gradient.fPoint[0],
gradient.fRadius[0],
xformed.begin(),
gradient.fColorOffsets,
gradient.fColorCount,
gradient.fTileMode,
gradient.fGradientFlags,
&shader->getLocalMatrix());
case SkShader::kSweep_GradientType:
return SkGradientShader::MakeSweep(gradient.fPoint[0].fX,
gradient.fPoint[0].fY,
xformed.begin(),
gradient.fColorOffsets,
gradient.fColorCount,
gradient.fGradientFlags,
&shader->getLocalMatrix());
case SkShader::kConical_GradientType:
return SkGradientShader::MakeTwoPointConical(gradient.fPoint[0],
gradient.fRadius[0],
gradient.fPoint[1],
gradient.fRadius[1],
xformed.begin(),
gradient.fColorOffsets,
gradient.fColorCount,
gradient.fTileMode,
gradient.fGradientFlags,
&shader->getLocalMatrix());
}
}
return nullptr;
}
const SkPaint& SkColorSpaceXformer::apply(const SkPaint& src) {
const SkPaint* result = &src;
auto get_dst = [&] {
if (result == &src) {
fDstPaint = src;
result = &fDstPaint;
}
return &fDstPaint;
};
// All SkColorSpaces have the same black point.
if (src.getColor() & 0xffffff) {
get_dst()->setColor(this->apply(src.getColor()));
}
if (auto shader = src.getShader()) {
if (auto replacement = this->apply(shader)) {
get_dst()->setShader(std::move(replacement));
}
}
if (auto cf = src.getColorFilter()) {
auto replacement = this->apply(cf);
if (replacement.get() != cf) {
get_dst()->setColorFilter(std::move(replacement));
}
}
if (auto looper = src.getDrawLooper()) {
get_dst()->setDrawLooper(looper->makeColorSpace(this));
}
if (auto imageFilter = src.getImageFilter()) {
get_dst()->setImageFilter(imageFilter->makeColorSpace(this));
}
return *result;
}
const SkPaint* SkColorSpaceXformer::apply(const SkPaint* src) {
return src ? &this->apply(*src) : nullptr;
}
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