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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 "SkRectShaderImageFilter.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkDevice.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkShader.h"
SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const SkRect& rect) {
SkASSERT(s);
uint32_t flags = CropRect::kHasAll_CropEdge;
if (rect.width() == 0 || rect.height() == 0) {
flags = 0x0;
}
CropRect cropRect(rect, flags);
return SkNEW_ARGS(SkRectShaderImageFilter, (s, &cropRect));
}
SkRectShaderImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const CropRect* cropRect) {
SkASSERT(s);
return SkNEW_ARGS(SkRectShaderImageFilter, (s, cropRect));
}
SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect)
: INHERITED(NULL, cropRect)
, fShader(s) {
SkASSERT(s);
s->ref();
}
SkRectShaderImageFilter::SkRectShaderImageFilter(SkReadBuffer& buffer)
: INHERITED(1, buffer) {
fShader = buffer.readShader();
}
void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fShader);
}
SkRectShaderImageFilter::~SkRectShaderImageFilter() {
SkSafeUnref(fShader);
}
bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source,
const Context& ctx,
SkBitmap* result,
SkIPoint* offset) const {
SkIRect bounds;
source.getBounds(&bounds);
if (!this->applyCropRect(&bounds, ctx.ctm())) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
bounds.height()));
if (NULL == device.get()) {
return false;
}
SkCanvas canvas(device.get());
SkPaint paint;
paint.setShader(fShader);
SkMatrix matrix(ctx.ctm());
matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
fShader->setLocalMatrix(matrix);
SkRect rect = SkRect::MakeWH(SkIntToScalar(bounds.width()), SkIntToScalar(bounds.height()));
canvas.drawRect(rect, paint);
*result = device.get()->accessBitmap(false);
offset->fX = bounds.fLeft;
offset->fY = bounds.fTop;
return true;
}
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