/*
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* Copyright 2012 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkMergeImageFilter.h"
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#include "SkCanvas.h"
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#include "SkColorSpaceXformer.h"
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#include "SkReadBuffer.h"
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#include "SkSpecialImage.h"
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#include "SkSpecialSurface.h"
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#include "SkWriteBuffer.h"
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#include "SkValidationUtils.h"
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sk_sp<SkImageFilter> SkMergeImageFilter::Make(sk_sp<SkImageFilter>* const filters, int count,
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const CropRect* cropRect) {
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return sk_sp<SkImageFilter>(new SkMergeImageFilter(filters, count, cropRect));
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}
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///////////////////////////////////////////////////////////////////////////////
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SkMergeImageFilter::SkMergeImageFilter(sk_sp<SkImageFilter>* const filters, int count,
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const CropRect* cropRect)
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: INHERITED(filters, count, cropRect) {
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SkASSERT(count >= 0);
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}
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sk_sp<SkSpecialImage> SkMergeImageFilter::onFilterImage(SkSpecialImage* source, const Context& ctx,
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SkIPoint* offset) const {
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int inputCount = this->countInputs();
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if (inputCount < 1) {
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return nullptr;
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}
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SkIRect bounds;
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bounds.setEmpty();
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std::unique_ptr<sk_sp<SkSpecialImage>[]> inputs(new sk_sp<SkSpecialImage>[inputCount]);
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std::unique_ptr<SkIPoint[]> offsets(new SkIPoint[inputCount]);
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// Filter all of the inputs.
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for (int i = 0; i < inputCount; ++i) {
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offsets[i] = { 0, 0 };
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inputs[i] = this->filterInput(i, source, ctx, &offsets[i]);
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if (!inputs[i]) {
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continue;
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}
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const SkIRect inputBounds = SkIRect::MakeXYWH(offsets[i].fX, offsets[i].fY,
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inputs[i]->width(), inputs[i]->height());
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bounds.join(inputBounds);
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}
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if (bounds.isEmpty()) {
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return nullptr;
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}
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// Apply the crop rect to the union of the inputs' bounds.
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// Note that the crop rect can only reduce the bounds, since this
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// filter does not affect transparent black.
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bool embiggen = false;
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this->getCropRect().applyTo(bounds, ctx.ctm(), embiggen, &bounds);
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if (!bounds.intersect(ctx.clipBounds())) {
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return nullptr;
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}
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const int x0 = bounds.left();
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const int y0 = bounds.top();
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sk_sp<SkSpecialSurface> surf(source->makeSurface(ctx.outputProperties(), bounds.size()));
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if (!surf) {
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return nullptr;
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}
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SkCanvas* canvas = surf->getCanvas();
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SkASSERT(canvas);
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canvas->clear(0x0);
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// Composite all of the filter inputs.
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for (int i = 0; i < inputCount; ++i) {
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if (!inputs[i]) {
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continue;
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}
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inputs[i]->draw(canvas,
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SkIntToScalar(offsets[i].x() - x0), SkIntToScalar(offsets[i].y() - y0),
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nullptr);
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}
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offset->fX = bounds.left();
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offset->fY = bounds.top();
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return surf->makeImageSnapshot();
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}
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sk_sp<SkImageFilter> SkMergeImageFilter::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
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SkSTArray<5, sk_sp<SkImageFilter>> inputs(this->countInputs());
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bool changed = false;
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for (int i = 0; i < this->countInputs(); i++) {
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inputs.push_back(xformer->apply(this->getInput(i)));
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changed |= (inputs[i].get() != this->getInput(i));
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}
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if (changed) {
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return SkMergeImageFilter::Make(inputs.begin(), this->countInputs(),
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this->getCropRectIfSet());
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}
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return this->refMe();
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}
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sk_sp<SkFlattenable> SkMergeImageFilter::CreateProc(SkReadBuffer& buffer) {
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Common common;
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if (!common.unflatten(buffer, -1) || !buffer.isValid()) {
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return nullptr;
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}
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return Make(common.inputs(), common.inputCount(), &common.cropRect());
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}
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void SkMergeImageFilter::flatten(SkWriteBuffer& buffer) const {
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this->INHERITED::flatten(buffer);
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}
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