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/*
* Copyright 2012 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorFilterImageFilter.h"
#include "SkCanvas.h"
#include "SkColorFilter.h"
#include "SkColorSpaceXformer.h"
#include "SkImageFilterPriv.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
sk_sp<SkImageFilter> SkColorFilterImageFilter::Make(sk_sp<SkColorFilter> cf,
sk_sp<SkImageFilter> input,
const CropRect* cropRect) {
if (!cf) {
return nullptr;
}
SkColorFilter* inputCF;
if (input && input->isColorFilterNode(&inputCF)) {
// This is an optimization, as it collapses the hierarchy by just combining the two
// colorfilters into a single one, which the new imagefilter will wrap.
sk_sp<SkColorFilter> newCF = cf->makeComposed(sk_sp<SkColorFilter>(inputCF));
if (newCF) {
return sk_sp<SkImageFilter>(new SkColorFilterImageFilter(std::move(newCF),
sk_ref_sp(input->getInput(0)),
cropRect));
}
}
return sk_sp<SkImageFilter>(new SkColorFilterImageFilter(std::move(cf),
std::move(input),
cropRect));
}
SkColorFilterImageFilter::SkColorFilterImageFilter(sk_sp<SkColorFilter> cf,
sk_sp<SkImageFilter> input,
const CropRect* cropRect)
: INHERITED(&input, 1, cropRect)
, fColorFilter(std::move(cf)) {
}
sk_sp<SkFlattenable> SkColorFilterImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
sk_sp<SkColorFilter> cf(buffer.readColorFilter());
return Make(std::move(cf), common.getInput(0), &common.cropRect());
}
void SkColorFilterImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fColorFilter.get());
}
sk_sp<SkSpecialImage> SkColorFilterImageFilter::onFilterImage(SkSpecialImage* source,
const Context& ctx,
SkIPoint* offset) const {
SkIPoint inputOffset = SkIPoint::Make(0, 0);
sk_sp<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
SkIRect inputBounds;
if (fColorFilter->affectsTransparentBlack()) {
// If the color filter affects transparent black, the bounds are the entire clip.
inputBounds = ctx.clipBounds();
} else if (!input) {
return nullptr;
} else {
inputBounds = SkIRect::MakeXYWH(inputOffset.x(), inputOffset.y(),
input->width(), input->height());
}
SkIRect bounds;
if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
return nullptr;
}
sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
paint.setColorFilter(fColorFilter);
// TODO: it may not be necessary to clear or drawPaint inside the input bounds
// (see skbug.com/5075)
if (fColorFilter->affectsTransparentBlack()) {
// The subsequent input->draw() call may not fill the entire canvas. For filters which
// affect transparent black, ensure that the filter is applied everywhere.
paint.setColor(SK_ColorTRANSPARENT);
canvas->drawPaint(paint);
paint.setColor(SK_ColorBLACK);
} else {
canvas->clear(0x0);
}
if (input) {
input->draw(canvas,
SkIntToScalar(inputOffset.fX - bounds.fLeft),
SkIntToScalar(inputOffset.fY - bounds.fTop),
&paint);
}
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return surf->makeImageSnapshot();
}
sk_sp<SkImageFilter> SkColorFilterImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer)
const {
SkASSERT(1 == this->countInputs());
sk_sp<SkImageFilter> input = xformer->apply(this->getInput(0));
auto colorFilter = xformer->apply(fColorFilter.get());
if (this->getInput(0) != input.get() || fColorFilter != colorFilter) {
return SkColorFilterImageFilter::Make(std::move(colorFilter), std::move(input),
this->getCropRectIfSet());
}
return this->refMe();
}
bool SkColorFilterImageFilter::onIsColorFilterNode(SkColorFilter** filter) const {
SkASSERT(1 == this->countInputs());
if (!this->cropRectIsSet()) {
if (filter) {
*filter = SkRef(fColorFilter.get());
}
return true;
}
return false;
}
bool SkColorFilterImageFilter::affectsTransparentBlack() const {
return fColorFilter->affectsTransparentBlack();
}
void SkColorFilterImageFilter::toString(SkString* str) const {
str->appendf("SkColorFilterImageFilter: (");
str->appendf("input: (");
if (this->getInput(0)) {
this->getInput(0)->toString(str);
}
str->appendf(") color filter: ");
fColorFilter->toString(str);
str->append(")");
}
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