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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.
#ifndef SkSurface_Base_DEFINED
#define SkSurface_Base_DEFINED
#include "include/core/SkCanvas.h"
#include "include/core/SkDeferredDisplayList.h"
#include "include/core/SkSurface.h"
#include "src/core/SkImagePriv.h"
#include "src/core/SkSurfacePriv.h"
class SkSurface_Base : public SkSurface {
SkSurface_Base(int width, int height, const SkSurfaceProps*);
SkSurface_Base(const SkImageInfo&, const SkSurfaceProps*);
virtual ~SkSurface_Base();
virtual GrContext* onGetContext();
virtual GrRecordingContext* onGetRecordingContext();
virtual GrBackendTexture onGetBackendTexture(BackendHandleAccess);
virtual GrBackendRenderTarget onGetBackendRenderTarget(BackendHandleAccess);
virtual bool onReplaceBackendTexture(const GrBackendTexture&,
* Allocate a canvas that will draw into this surface. We will cache this
* canvas, to return the same object to the caller multiple times. We
* take ownership, and will call unref() on the canvas when we go out of
* scope.
virtual SkCanvas* onNewCanvas() = 0;
virtual sk_sp<SkSurface> onNewSurface(const SkImageInfo&) = 0;
* Allocate an SkImage that represents the current contents of the surface.
* This needs to be able to outlive the surface itself (if need be), and
* must faithfully represent the current contents, even if the surface
* is changed after this called (e.g. it is drawn to via its canvas).
* If a subset is specified, the the impl must make a copy, rather than try to wait
* on copy-on-write.
virtual sk_sp<SkImage> onNewImageSnapshot(const SkIRect* subset = nullptr) { return nullptr; }
virtual void onWritePixels(const SkPixmap&, int x, int y) = 0;
* Default implementation does a rescale/read and then calls the callback.
virtual void onAsyncRescaleAndReadPixels(const SkImageInfo&,
const SkIRect& srcRect,
* Default implementation does a rescale/read/yuv conversion and then calls the callback.
virtual void onAsyncRescaleAndReadPixelsYUV420(SkYUVColorSpace,
sk_sp<SkColorSpace> dstColorSpace,
const SkIRect& srcRect,
const SkISize& dstSize,
* Default implementation:
* image = this->newImageSnapshot();
* if (image) {
* image->draw(canvas, ...);
* image->unref();
* }
virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*);
* Called as a performance hint when the Surface is allowed to make it's contents
* undefined.
virtual void onDiscard() {}
* If the surface is about to change, we call this so that our subclass
* can optionally fork their backend (copy-on-write) in case it was
* being shared with the cachedImage.
virtual void onCopyOnWrite(ContentChangeMode) = 0;
* Signal the surface to remind its backing store that it's mutable again.
* Called only when we _didn't_ copy-on-write; we assume the copies start mutable.
virtual void onRestoreBackingMutability() {}
* Issue any pending surface IO to the current backend 3D API and resolve any surface MSAA.
* Inserts the requested number of semaphores for the gpu to signal when work is complete on the
* gpu and inits the array of GrBackendSemaphores with the signaled semaphores.
virtual GrSemaphoresSubmitted onFlush(BackendSurfaceAccess access, const GrFlushInfo&,
const GrBackendSurfaceMutableState*) {
return GrSemaphoresSubmitted::kNo;
* Caused the current backend 3D API to wait on the passed in semaphores before executing new
* commands on the gpu. Any previously submitting commands will not be blocked by these
* semaphores.
virtual bool onWait(int numSemaphores, const GrBackendSemaphore* waitSemaphores) {
return false;
virtual bool onCharacterize(SkSurfaceCharacterization*) const { return false; }
virtual bool onIsCompatible(const SkSurfaceCharacterization&) const { return false; }
virtual bool onDraw(sk_sp<const SkDeferredDisplayList>) { return false; }
inline SkCanvas* getCachedCanvas();
inline sk_sp<SkImage> refCachedImage();
bool hasCachedImage() const { return fCachedImage != nullptr; }
// called by SkSurface to compute a new genID
uint32_t newGenerationID();
std::unique_ptr<SkCanvas> fCachedCanvas;
sk_sp<SkImage> fCachedImage;
void aboutToDraw(ContentChangeMode mode);
// Returns true if there is an outstanding image-snapshot, indicating that a call to aboutToDraw
// would trigger a copy-on-write.
bool outstandingImageSnapshot() const;
friend class SkCanvas;
friend class SkSurface;
typedef SkSurface INHERITED;
SkCanvas* SkSurface_Base::getCachedCanvas() {
if (nullptr == fCachedCanvas) {
fCachedCanvas = std::unique_ptr<SkCanvas>(this->onNewCanvas());
if (fCachedCanvas) {
return fCachedCanvas.get();
sk_sp<SkImage> SkSurface_Base::refCachedImage() {
if (fCachedImage) {
return fCachedImage;
fCachedImage = this->onNewImageSnapshot();
SkASSERT(!fCachedCanvas || fCachedCanvas->getSurfaceBase() == this);
return fCachedImage;