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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkSurface_Base.h"
#include "SkCanvas.h"
#include "SkImagePriv.h"
#include "SkPicture.h"
/**
* What does it mean to ask for more than one canvas from a picture?
* How do we return an Image and then "continue" recording?
*/
class SkSurface_Picture : public SkSurface_Base {
public:
SkSurface_Picture(int width, int height);
virtual ~SkSurface_Picture();
virtual SkCanvas* onNewCanvas() SK_OVERRIDE;
virtual SkSurface* onNewSurface(const SkImage::Info&) SK_OVERRIDE;
virtual SkImage* onNewImageShapshot() SK_OVERRIDE;
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y,
const SkPaint*) SK_OVERRIDE;
virtual void onCopyOnWrite(SkImage*, SkCanvas*) SK_OVERRIDE;
private:
SkPicture* fPicture;
SkPicture* fRecordingPicture;
typedef SkSurface_Base INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
SkSurface_Picture::SkSurface_Picture(int width, int height) : INHERITED(width, height) {
fPicture = NULL;
}
SkSurface_Picture::~SkSurface_Picture() {
SkSafeUnref(fPicture);
}
SkCanvas* SkSurface_Picture::onNewCanvas() {
if (!fPicture) {
fPicture = SkNEW(SkPicture);
}
SkCanvas* canvas = fPicture->beginRecording(this->width(), this->height());
canvas->ref(); // our caller will call unref()
return canvas;
}
SkSurface* SkSurface_Picture::onNewSurface(const SkImage::Info& info) {
return SkSurface::NewPicture(info.fWidth, info.fHeight);
}
SkImage* SkSurface_Picture::onNewImageShapshot() {
if (fPicture) {
return SkNewImageFromPicture(fPicture);
} else {
SkImage::Info info;
info.fWidth = info.fHeight = 0;
info.fColorType = SkImage::kPMColor_ColorType;
info.fAlphaType = SkImage::kOpaque_AlphaType;
return SkImage::NewRasterCopy(info, NULL, 0);
}
}
void SkSurface_Picture::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y,
const SkPaint* paint) {
if (!fPicture) {
return;
}
SkImagePrivDrawPicture(canvas, fPicture, x, y, paint);
}
void SkSurface_Picture::onCopyOnWrite(SkImage* cachedImage, SkCanvas*) {
// We always spawn a copy of the recording picture when we
// are asked for a snapshot, so we never need to do anything here.
}
///////////////////////////////////////////////////////////////////////////////
SkSurface* SkSurface::NewPicture(int width, int height) {
if ((width | height) < 0) {
return NULL;
}
return SkNEW_ARGS(SkSurface_Picture, (width, height));
}
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