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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 "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
SkImageFilter* SkColorFilterImageFilter::Create(SkColorFilter* cf, 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(SkColorFilter::MakeComposeFilter(sk_ref_sp(cf),
sk_sp<SkColorFilter>(inputCF)));
if (newCF) {
return new SkColorFilterImageFilter(newCF.get(), input->getInput(0), cropRect);
}
}
return new SkColorFilterImageFilter(cf, input, cropRect);
}
SkColorFilterImageFilter::SkColorFilterImageFilter(SkColorFilter* cf,
SkImageFilter* input,
const CropRect* cropRect)
: INHERITED(1, &input, cropRect)
, fColorFilter(SkRef(cf)) {
}
SkFlattenable* SkColorFilterImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
sk_sp<SkColorFilter> cf(buffer.readColorFilter());
return Create(cf.get(), common.getInput(0), &common.cropRect());
}
void SkColorFilterImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fColorFilter.get());
}
SkSpecialImage* SkColorFilterImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
SkIPoint* offset) const {
SkIPoint inputOffset = SkIPoint::Make(0, 0);
SkAutoTUnref<SkSpecialImage> input(this->filterInput(0, source, ctx, &inputOffset));
if (!input) {
return nullptr;
}
SkIRect bounds;
const SkIRect inputBounds = SkIRect::MakeXYWH(inputOffset.fX, inputOffset.fY,
input->width(), input->height());
if (!this->applyCropRect(ctx, inputBounds, &bounds)) {
return nullptr;
}
SkImageInfo info = SkImageInfo::MakeN32(bounds.width(), bounds.height(), kPremul_SkAlphaType);
sk_sp<SkSpecialSurface> surf(source->makeSurface(info));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
// TODO: it seems like this clear shouldn't be necessary (see skbug.com/5075)
canvas->clear(0x0);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
paint.setColorFilter(fColorFilter);
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().release();
}
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::canComputeFastBounds() const {
if (fColorFilter->affectsTransparentBlack()) {
return false;
}
return INHERITED::canComputeFastBounds();
}
#ifndef SK_IGNORE_TO_STRING
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(")");
}
#endif
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