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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file
*/
#include "SkCanvas.h"
#include "SkSpecialImage.h"
#include "SkSpecialSurface.h"
#include "SkSurfacePriv.h"
///////////////////////////////////////////////////////////////////////////////
class SkSpecialSurface_Base : public SkSpecialSurface {
public:
SkSpecialSurface_Base(const SkIRect& subset, const SkSurfaceProps* props)
: INHERITED(subset, props)
, fCanvas(nullptr) {
}
virtual ~SkSpecialSurface_Base() { }
// reset is called after an SkSpecialImage has been snapped
void reset() { fCanvas.reset(); }
// This can return nullptr if reset has already been called or something when wrong in the ctor
SkCanvas* onGetCanvas() { return fCanvas; }
virtual sk_sp<SkSpecialImage> onMakeImageSnapshot() = 0;
protected:
SkAutoTUnref<SkCanvas> fCanvas; // initialized by derived classes in ctors
private:
typedef SkSpecialSurface INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkSpecialSurface_Base* as_SB(SkSpecialSurface* surface) {
return static_cast<SkSpecialSurface_Base*>(surface);
}
SkSpecialSurface::SkSpecialSurface(const SkIRect& subset,
const SkSurfaceProps* props)
: fProps(SkSurfacePropsCopyOrDefault(props).flags(), kUnknown_SkPixelGeometry)
, fSubset(subset) {
SkASSERT(fSubset.width() > 0);
SkASSERT(fSubset.height() > 0);
}
SkCanvas* SkSpecialSurface::getCanvas() {
return as_SB(this)->onGetCanvas();
}
sk_sp<SkSpecialImage> SkSpecialSurface::makeImageSnapshot() {
sk_sp<SkSpecialImage> image(as_SB(this)->onMakeImageSnapshot());
as_SB(this)->reset();
return image; // the caller gets the creation ref
}
///////////////////////////////////////////////////////////////////////////////
#include "SkMallocPixelRef.h"
class SkSpecialSurface_Raster : public SkSpecialSurface_Base {
public:
SkSpecialSurface_Raster(SkPixelRef* pr,
const SkIRect& subset,
const SkSurfaceProps* props)
: INHERITED(subset, props) {
const SkImageInfo& info = pr->info();
fBitmap.setInfo(info, info.minRowBytes());
fBitmap.setPixelRef(pr);
fCanvas.reset(new SkCanvas(fBitmap, this->props()));
fCanvas->clipRect(SkRect::Make(subset));
}
~SkSpecialSurface_Raster() override { }
sk_sp<SkSpecialImage> onMakeImageSnapshot() override {
return SkSpecialImage::MakeFromRaster(this->subset(), fBitmap, &this->props());
}
private:
SkBitmap fBitmap;
typedef SkSpecialSurface_Base INHERITED;
};
sk_sp<SkSpecialSurface> SkSpecialSurface::MakeFromBitmap(const SkIRect& subset, SkBitmap& bm,
const SkSurfaceProps* props) {
return sk_make_sp<SkSpecialSurface_Raster>(bm.pixelRef(), subset, props);
}
sk_sp<SkSpecialSurface> SkSpecialSurface::MakeRaster(const SkImageInfo& info,
const SkSurfaceProps* props) {
SkAutoTUnref<SkPixelRef> pr(SkMallocPixelRef::NewZeroed(info, 0, nullptr));
if (nullptr == pr.get()) {
return nullptr;
}
const SkIRect subset = SkIRect::MakeWH(pr->info().width(), pr->info().height());
return sk_make_sp<SkSpecialSurface_Raster>(pr, subset, props);
}
#if SK_SUPPORT_GPU
///////////////////////////////////////////////////////////////////////////////
#include "GrContext.h"
#include "SkGpuDevice.h"
class SkSpecialSurface_Gpu : public SkSpecialSurface_Base {
public:
SkSpecialSurface_Gpu(sk_sp<GrTexture> texture,
int width, int height,
const SkIRect& subset,
const SkSurfaceProps* props)
: INHERITED(subset, props)
, fTexture(std::move(texture)) {
SkASSERT(fTexture->asRenderTarget());
sk_sp<SkGpuDevice> device(SkGpuDevice::Create(fTexture->asRenderTarget(), width, height,
props,
SkGpuDevice::kUninit_InitContents));
if (!device) {
return;
}
fCanvas.reset(new SkCanvas(device.get()));
fCanvas->clipRect(SkRect::Make(subset));
}
~SkSpecialSurface_Gpu() override { }
sk_sp<SkSpecialImage> onMakeImageSnapshot() override {
// Note: we are intentionally zeroing out 'fTexture' here
return SkSpecialImage::MakeFromGpu(this->subset(),
kNeedNewImageUniqueID_SpecialImage,
std::move(fTexture),
&this->props());
}
private:
sk_sp<GrTexture> fTexture;
typedef SkSpecialSurface_Base INHERITED;
};
sk_sp<SkSpecialSurface> SkSpecialSurface::MakeRenderTarget(GrContext* context,
int width, int height,
GrPixelConfig config) {
if (!context) {
return nullptr;
}
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = width;
desc.fHeight = height;
desc.fConfig = config;
sk_sp<GrTexture> tex(context->textureProvider()->createApproxTexture(desc));
if (!tex) {
return nullptr;
}
const SkIRect subset = SkIRect::MakeWH(width, height);
return sk_make_sp<SkSpecialSurface_Gpu>(std::move(tex), width, height, subset, nullptr);
}
#endif
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