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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 "SkDevice.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkValidationUtils.h"
///////////////////////////////////////////////////////////////////////////////
void SkMergeImageFilter::initAllocModes() {
int inputCount = 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 = NULL;
}
}
void SkMergeImageFilter::initModes(const SkXfermode::Mode modes[]) {
if (modes) {
this->initAllocModes();
int inputCount = countInputs();
for (int i = 0; i < inputCount; ++i) {
fModes[i] = SkToU8(modes[i]);
}
} else {
fModes = NULL;
}
}
SkMergeImageFilter::SkMergeImageFilter(SkImageFilter* filters[], int count,
const SkXfermode::Mode modes[],
const CropRect* cropRect)
: INHERITED(count, filters, cropRect) {
SkASSERT(count >= 0);
this->initModes(modes);
}
SkMergeImageFilter::~SkMergeImageFilter() {
if (fModes != SkTCast<uint8_t*>(fStorage)) {
sk_free(fModes);
}
}
bool SkMergeImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
const Context& ctx,
SkBitmap* result, SkIPoint* offset) const {
if (countInputs() < 1) {
return false;
}
SkIRect bounds;
if (!this->applyCropRect(ctx, src, SkIPoint::Make(0, 0), &bounds)) {
return false;
}
const int x0 = bounds.left();
const int y0 = bounds.top();
SkAutoTUnref<SkBaseDevice> dst(proxy->createDevice(bounds.width(), bounds.height()));
if (NULL == dst) {
return false;
}
SkCanvas canvas(dst);
SkPaint paint;
bool didProduceResult = false;
int inputCount = countInputs();
for (int i = 0; i < inputCount; ++i) {
SkBitmap tmp;
const SkBitmap* srcPtr;
SkIPoint pos = SkIPoint::Make(0, 0);
SkImageFilter* filter = getInput(i);
if (filter) {
if (!filter->filterImage(proxy, src, ctx, &tmp, &pos)) {
continue;
}
srcPtr = &tmp;
} else {
srcPtr = &src;
}
if (fModes) {
paint.setXfermodeMode((SkXfermode::Mode)fModes[i]);
} else {
paint.setXfermode(NULL);
}
canvas.drawSprite(*srcPtr, pos.x() - x0, pos.y() - y0, &paint);
didProduceResult = true;
}
if (!didProduceResult)
return false;
offset->fX = bounds.left();
offset->fY = bounds.top();
*result = dst->accessBitmap(false);
return true;
}
SkFlattenable* SkMergeImageFilter::CreateProc(SkReadBuffer& buffer) {
Common common;
if (!common.unflatten(buffer, -1)) {
return NULL;
}
const int count = common.inputCount();
bool hasModes = buffer.readBool();
if (hasModes) {
SkAutoSTArray<4, SkXfermode::Mode> modes(count);
SkAutoSTArray<4, uint8_t> modes8(count);
if (!buffer.readByteArray(modes8.get(), count)) {
return NULL;
}
for (int i = 0; i < count; ++i) {
modes[i] = (SkXfermode::Mode)modes8[i];
buffer.validate(SkIsValidMode(modes[i]));
}
if (!buffer.isValid()) {
return NULL;
}
return Create(common.inputs(), count, modes.get(), &common.cropRect());
}
return Create(common.inputs(), count, NULL, &common.cropRect());
}
void SkMergeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeBool(fModes != NULL);
if (fModes) {
buffer.writeByteArray(fModes, 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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