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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 "SkReadBuffer.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkWriteBuffer.h"
#include "SkValidationUtils.h"
sk_sp<SkImageFilter> SkMergeImageFilter::Make(sk_sp<SkImageFilter> first,
sk_sp<SkImageFilter> second,
SkBlendMode mode,
const CropRect* cropRect) {
sk_sp<SkImageFilter> inputs[2] = { first, second };
SkBlendMode modes[2] = { mode, mode };
return sk_sp<SkImageFilter>(new SkMergeImageFilter(inputs, 2, modes, cropRect));
}
sk_sp<SkImageFilter> SkMergeImageFilter::MakeN(sk_sp<SkImageFilter> filters[], int count,
const SkBlendMode modes[],
const CropRect* cropRect) {
return sk_sp<SkImageFilter>(new SkMergeImageFilter(filters, count, modes, cropRect));
}
///////////////////////////////////////////////////////////////////////////////
void SkMergeImageFilter::initAllocModes() {
int inputCount = this->countInputs();
if (inputCount) {
size_t size = sizeof(uint8_t) * inputCount;
if (size <= sizeof(fStorage)) {
fModes = SkTCast<uint8_t*>(fStorage);
} else {
fModes = SkTCast<uint8_t*>(sk_malloc_throw(size));
}
} else {
fModes = nullptr;
}
}
void SkMergeImageFilter::initModes(const SkBlendMode modes[]) {
if (modes) {
this->initAllocModes();
int inputCount = this->countInputs();
for (int i = 0; i < inputCount; ++i) {
fModes[i] = SkToU8((unsigned)modes[i]);
}
} else {
fModes = nullptr;
}
}
SkMergeImageFilter::SkMergeImageFilter(sk_sp<SkImageFilter> filters[], int count,
const SkBlendMode modes[],
const CropRect* cropRect)
: INHERITED(filters, count, cropRect) {
SkASSERT(count >= 0);
this->initModes(modes);
}
SkMergeImageFilter::~SkMergeImageFilter() {
if (fModes != SkTCast<uint8_t*>(fStorage)) {
sk_free(fModes);
}
}
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].setZero();
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;
}
SkPaint paint;
if (fModes) {
paint.setBlendMode((SkBlendMode)fModes[i]);
}
inputs[i]->draw(canvas,
SkIntToScalar(offsets[i].x() - x0), SkIntToScalar(offsets[i].y() - y0),
&paint);
}
offset->fX = bounds.left();
offset->fY = bounds.top();
return surf->makeImageSnapshot();
}
sk_sp<SkFlattenable> SkMergeImageFilter::CreateProc(SkReadBuffer& buffer) {
Common common;
if (!common.unflatten(buffer, -1)) {
return nullptr;
}
const int count = common.inputCount();
bool hasModes = buffer.readBool();
if (hasModes) {
SkAutoSTArray<4, SkBlendMode> modes(count);
SkAutoSTArray<4, uint8_t> modes8(count);
if (!buffer.readByteArray(modes8.get(), count)) {
return nullptr;
}
for (int i = 0; i < count; ++i) {
modes[i] = (SkBlendMode)modes8[i];
buffer.validate(SkIsValidMode(modes[i]));
}
if (!buffer.isValid()) {
return nullptr;
}
return MakeN(common.inputs(), count, modes.get(), &common.cropRect());
}
return MakeN(common.inputs(), count, nullptr, &common.cropRect());
}
void SkMergeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeBool(fModes != nullptr);
if (fModes) {
buffer.writeByteArray(fModes, this->countInputs() * sizeof(fModes[0]));
}
}
#ifndef SK_IGNORE_TO_STRING
void SkMergeImageFilter::toString(SkString* str) const {
str->appendf("SkMergeImageFilter: (");
for (int i = 0; i < this->countInputs(); ++i) {
SkImageFilter* filter = this->getInput(i);
str->appendf("%d: (", i);
filter->toString(str);
str->appendf(")");
}
str->append(")");
}
#endif
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