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/*
* Copyright 2013 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 "SkResizeImageFilter.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkColorPriv.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMatrix.h"
#include "SkRect.h"
SkResizeImageFilter::SkResizeImageFilter(SkScalar sx, SkScalar sy, SkPaint::FilterLevel filterLevel,
SkImageFilter* input)
: INHERITED(input),
fSx(sx),
fSy(sy),
fFilterLevel(filterLevel) {
}
SkResizeImageFilter::SkResizeImageFilter(SkReadBuffer& buffer)
: INHERITED(1, buffer) {
fSx = buffer.readScalar();
fSy = buffer.readScalar();
fFilterLevel = static_cast<SkPaint::FilterLevel>(buffer.readInt());
}
void SkResizeImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeScalar(fSx);
buffer.writeScalar(fSy);
buffer.writeInt(fFilterLevel);
}
SkResizeImageFilter::~SkResizeImageFilter() {
}
bool SkResizeImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source,
const SkMatrix& matrix,
SkBitmap* result,
SkIPoint* offset) const {
SkBitmap src = source;
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (getInput(0) && !getInput(0)->filterImage(proxy, source, matrix, &src, &srcOffset)) {
return false;
}
SkRect dstRect;
SkIRect srcBounds, dstBounds;
src.getBounds(&srcBounds);
srcBounds.offset(srcOffset);
SkRect srcRect = SkRect::Make(srcBounds);
SkMatrix dstMatrix;
dstMatrix.setScale(fSx, fSy);
dstMatrix.mapRect(&dstRect, srcRect);
dstRect.roundOut(&dstBounds);
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device.get());
canvas.translate(-SkIntToScalar(dstBounds.fLeft), -SkIntToScalar(dstBounds.fTop));
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
paint.setFilterLevel(fFilterLevel);
canvas.concat(dstMatrix);
canvas.drawBitmap(src, srcRect.left(), srcRect.top(), &paint);
*result = device.get()->accessBitmap(false);
offset->fX = dstBounds.fLeft;
offset->fY = dstBounds.fTop;
return true;
}
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