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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 "SkMergeImageFilter.h"
#include "SkCanvas.h"
#include "SkColorSpaceXformer.h"
#include "SkFlattenablePriv.h"
#include "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
#include "SkValidationUtils.h"
sk_sp<SkImageFilter> SkMergeImageFilter::Make(sk_sp<SkImageFilter>* const filters, int count,
const CropRect* cropRect) {
return sk_sp<SkImageFilter>(new SkMergeImageFilter(filters, count, cropRect));
}
///////////////////////////////////////////////////////////////////////////////
SkMergeImageFilter::SkMergeImageFilter(sk_sp<SkImageFilter>* const filters, int count,
const CropRect* cropRect)
: INHERITED(filters, count, cropRect) {
SkASSERT(count >= 0);
}
sk_sp<SkSpecialImage> SkMergeImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
SkIPoint* offset) const {
int inputCount = this->countInputs();
if (inputCount < 1) {
return nullptr;
}
SkIRect bounds;
bounds.setEmpty();
std::unique_ptr<sk_sp<SkSpecialImage>[]> inputs(new sk_sp<SkSpecialImage>[inputCount]);
std::unique_ptr<SkIPoint[]> offsets(new SkIPoint[inputCount]);
// Filter all of the inputs.
for (int i = 0; i < inputCount; ++i) {
offsets[i] = { 0, 0 };
inputs[i] = this->filterInput(i, source, ctx, &offsets[i]);
if (!inputs[i]) {
continue;
}
const SkIRect inputBounds = SkIRect::MakeXYWH(offsets[i].fX, offsets[i].fY,
inputs[i]->width(), inputs[i]->height());
bounds.join(inputBounds);
}
if (bounds.isEmpty()) {
return nullptr;
}
// Apply the crop rect to the union of the inputs' bounds.
// Note that the crop rect can only reduce the bounds, since this
// filter does not affect transparent black.
bool embiggen = false;
this->getCropRect().applyTo(bounds, ctx.ctm(), embiggen, &bounds);
if (!bounds.intersect(ctx.clipBounds())) {
return nullptr;
}
const int x0 = bounds.left();
const int y0 = bounds.top();
sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
if (!surf) {
return nullptr;
}
SkCanvas* canvas = surf->getCanvas();
SkASSERT(canvas);
canvas->clear(0x0);
// Composite all of the filter inputs.
for (int i = 0; i < inputCount; ++i) {
if (!inputs[i]) {
continue;
}
inputs[i]->draw(canvas,
SkIntToScalar(offsets[i].x() - x0), SkIntToScalar(offsets[i].y() - y0),
nullptr);
}
offset->fX = bounds.left();
offset->fY = bounds.top();
return surf->makeImageSnapshot();
}
sk_sp<SkImageFilter> SkMergeImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
SkSTArray<5, sk_sp<SkImageFilter>> inputs(this->countInputs());
bool changed = false;
for (int i = 0; i < this->countInputs(); i++) {
inputs.push_back(xformer->apply(this->getInput(i)));
changed |= (inputs[i].get() != this->getInput(i));
}
if (changed) {
return SkMergeImageFilter::Make(inputs.begin(), this->countInputs(),
this->getCropRectIfSet());
}
return this->refMe();
}
sk_sp<SkFlattenable> SkMergeImageFilter::CreateProc(SkReadBuffer& buffer) {
Common common;
if (!common.unflatten(buffer, -1) || !buffer.isValid()) {
return nullptr;
}
return Make(common.inputs(), common.inputCount(), &common.cropRect());
}
void SkMergeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
}
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