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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 "SkOffsetImageFilter.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkFlattenableBuffers.h"
#include "SkMatrix.h"
#include "SkPaint.h"
bool SkOffsetImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
const SkMatrix& matrix,
SkBitmap* result,
SkIPoint* loc) {
SkImageFilter* input = getInput(0);
SkBitmap src = source;
#ifdef SK_DISABLE_OFFSETIMAGEFILTER_OPTIMIZATION
if (false) {
#else
if (!cropRectIsSet()) {
#endif
if (input && !input->filterImage(proxy, source, matrix, &src, loc)) {
return false;
}
SkVector vec;
matrix.mapVectors(&vec, &fOffset, 1);
loc->fX += SkScalarRoundToInt(vec.fX);
loc->fY += SkScalarRoundToInt(vec.fY);
*result = src;
} else {
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (input && !input->filterImage(proxy, source, matrix, &src, &srcOffset)) {
return false;
}
SkIRect bounds;
src.getBounds(&bounds);
if (!applyCropRect(&bounds, matrix)) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawBitmap(src, fOffset.fX - bounds.left(), fOffset.fY - bounds.top(), &paint);
*result = device->accessBitmap(false);
loc->fX += bounds.left();
loc->fY += bounds.top();
}
return true;
}
bool SkOffsetImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) {
SkVector vec;
ctm.mapVectors(&vec, &fOffset, 1);
*dst = src;
dst->offset(SkScalarRoundToInt(vec.fX), SkScalarRoundToInt(vec.fY));
return true;
}
void SkOffsetImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fOffset);
}
SkOffsetImageFilter::SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input,
const CropRect* cropRect) : INHERITED(input, cropRect) {
fOffset.set(dx, dy);
}
SkOffsetImageFilter::SkOffsetImageFilter(SkFlattenableReadBuffer& buffer)
: INHERITED(1, buffer) {
buffer.readPoint(&fOffset);
buffer.validate(SkScalarIsFinite(fOffset.fX) &&
SkScalarIsFinite(fOffset.fY));
}
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