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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTileImageFilter.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkShader.h"
#include "SkValidationUtils.h"
SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
SkImageFilter* input, uint32_t uniqueID) {
if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
return NULL;
}
return SkNEW_ARGS(SkTileImageFilter, (srcRect, dstRect, input, uniqueID));
}
bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
const Context& ctx,
SkBitmap* dst, SkIPoint* offset) const {
SkBitmap source = src;
SkImageFilter* input = getInput(0);
SkIPoint srcOffset = SkIPoint::Make(0, 0);
if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
return false;
}
SkRect dstRect;
ctx.ctm().mapRect(&dstRect, fDstRect);
const SkIRect dstIRect = dstRect.roundOut();
int w = dstIRect.width();
int h = dstIRect.height();
if (!fSrcRect.width() || !fSrcRect.height() || !w || !h) {
return false;
}
SkRect srcRect;
ctx.ctm().mapRect(&srcRect, fSrcRect);
SkIRect srcIRect;
srcRect.roundOut(&srcIRect);
srcIRect.offset(-srcOffset);
SkBitmap subset;
SkIRect bounds;
source.getBounds(&bounds);
if (!srcIRect.intersect(bounds)) {
offset->fX = offset->fY = 0;
return true;
} else if (!source.extractSubset(&subset, srcIRect)) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(w, h));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
SkMatrix shaderMatrix;
shaderMatrix.setTranslate(SkIntToScalar(srcOffset.fX),
SkIntToScalar(srcOffset.fY));
SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(subset,
SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode,
&shaderMatrix));
paint.setShader(shader);
canvas.translate(-dstRect.fLeft, -dstRect.fTop);
canvas.drawRect(dstRect, paint);
*dst = device->accessBitmap(false);
offset->fX = dstIRect.fLeft;
offset->fY = dstIRect.fTop;
return true;
}
bool SkTileImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
SkIRect* dst) const {
SkRect srcRect;
ctm.mapRect(&srcRect, fSrcRect);
SkIRect srcIRect;
srcRect.roundOut(&srcIRect);
srcIRect.join(src);
*dst = srcIRect;
return true;
}
SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
SkRect src, dst;
buffer.readRect(&src);
buffer.readRect(&dst);
return Create(src, dst, common.getInput(0), common.uniqueID());
}
void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeRect(fSrcRect);
buffer.writeRect(fDstRect);
}
#ifndef SK_IGNORE_TO_STRING
void SkTileImageFilter::toString(SkString* str) const {
str->appendf("SkTileImageFilter: (");
str->append(")");
}
#endif
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