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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"
SkImageFilter* 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 s ? new SkRectShaderImageFilter(s, &cropRect) : nullptr;
}
SkImageFilter* SkRectShaderImageFilter::Create(SkShader* s, const CropRect* cropRect) {
SkASSERT(s);
return s ? new SkRectShaderImageFilter(s, cropRect) : nullptr;
}
SkRectShaderImageFilter::SkRectShaderImageFilter(SkShader* s, const CropRect* cropRect)
: INHERITED(0, nullptr, cropRect)
, fShader(SkRef(s)) {
}
SkFlattenable* SkRectShaderImageFilter::CreateProc(SkReadBuffer& buffer) {
SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
SkAutoTUnref<SkShader> shader(buffer.readShader());
return Create(shader.get(), &common.cropRect());
}
void SkRectShaderImageFilter::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writeFlattenable(fShader);
}
SkRectShaderImageFilter::~SkRectShaderImageFilter() {
fShader->unref();
}
bool SkRectShaderImageFilter::onFilterImage(Proxy* proxy,
const SkBitmap& source,
const Context& ctx,
SkBitmap* result,
SkIPoint* offset) const {
SkIRect bounds;
if (!this->applyCropRect(ctx, source, SkIPoint::Make(0, 0), &bounds)) {
return false;
}
SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
bounds.height()));
if (nullptr == device.get()) {
return false;
}
SkCanvas canvas(device.get());
SkPaint paint;
SkMatrix matrix(ctx.ctm());
matrix.postTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top()));
SkSafeUnref(paint.setShader(fShader->newWithLocalMatrix(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;
}
bool SkRectShaderImageFilter::canComputeFastBounds() const {
// http:skbug.com/4627: "make computeFastBounds and onFilterBounds() CropRect-aware"
// computeFastBounds() doesn't currently take the crop rect into account,
// so we can't compute it. If a full crop rect is set, we should return true here.
return false;
}
#ifndef SK_IGNORE_TO_STRING
void SkRectShaderImageFilter::toString(SkString* str) const {
str->appendf("SkRectShaderImageFilter: (");
str->append(")");
}
#endif
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