| /* |
| * 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 "SkImagePriv.h" |
| #include "SkCanvas.h" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkSurface_Base::SkSurface_Base(int width, int height) : INHERITED(width, height) { |
| fCachedCanvas = NULL; |
| fCachedImage = NULL; |
| } |
| |
| SkSurface_Base::SkSurface_Base(const SkImageInfo& info) : INHERITED(info) { |
| fCachedCanvas = NULL; |
| fCachedImage = NULL; |
| } |
| |
| SkSurface_Base::~SkSurface_Base() { |
| // in case the canvas outsurvives us, we null the callback |
| if (fCachedCanvas) { |
| fCachedCanvas->setSurfaceBase(NULL); |
| } |
| |
| SkSafeUnref(fCachedImage); |
| SkSafeUnref(fCachedCanvas); |
| } |
| |
| void SkSurface_Base::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, |
| const SkPaint* paint) { |
| SkImage* image = this->newImageSnapshot(); |
| if (image) { |
| image->draw(canvas, x, y, paint); |
| image->unref(); |
| } |
| } |
| |
| void SkSurface_Base::aboutToDraw(ContentChangeMode mode) { |
| this->dirtyGenerationID(); |
| |
| if (NULL != fCachedCanvas) { |
| SkASSERT(fCachedCanvas->getSurfaceBase() == this || \ |
| NULL == fCachedCanvas->getSurfaceBase()); |
| fCachedCanvas->setSurfaceBase(NULL); |
| } |
| |
| if (NULL != fCachedImage) { |
| // the surface may need to fork its backend, if its sharing it with |
| // the cached image. Note: we only call if there is an outstanding owner |
| // on the image (besides us). |
| if (!fCachedImage->unique()) { |
| this->onCopyOnWrite(mode); |
| } |
| |
| // regardless of copy-on-write, we must drop our cached image now, so |
| // that the next request will get our new contents. |
| fCachedImage->unref(); |
| fCachedImage = NULL; |
| } |
| } |
| |
| uint32_t SkSurface_Base::newGenerationID() { |
| this->installIntoCanvasForDirtyNotification(); |
| |
| static int32_t gID; |
| return sk_atomic_inc(&gID) + 1; |
| } |
| |
| static SkSurface_Base* asSB(SkSurface* surface) { |
| return static_cast<SkSurface_Base*>(surface); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SkSurface::SkSurface(int width, int height) : fWidth(width), fHeight(height) { |
| SkASSERT(fWidth >= 0); |
| SkASSERT(fHeight >= 0); |
| fGenerationID = 0; |
| } |
| |
| SkSurface::SkSurface(const SkImageInfo& info) |
| : fWidth(info.fWidth) |
| , fHeight(info.fHeight) |
| { |
| SkASSERT(fWidth >= 0); |
| SkASSERT(fHeight >= 0); |
| fGenerationID = 0; |
| } |
| |
| uint32_t SkSurface::generationID() { |
| if (0 == fGenerationID) { |
| fGenerationID = asSB(this)->newGenerationID(); |
| } |
| return fGenerationID; |
| } |
| |
| void SkSurface::notifyContentWillChange(ContentChangeMode mode) { |
| asSB(this)->aboutToDraw(mode); |
| } |
| |
| SkCanvas* SkSurface::getCanvas() { |
| return asSB(this)->getCachedCanvas(); |
| } |
| |
| SkImage* SkSurface::newImageSnapshot() { |
| SkImage* image = asSB(this)->getCachedImage(); |
| SkSafeRef(image); // the caller will call unref() to balance this |
| return image; |
| } |
| |
| SkSurface* SkSurface::newSurface(const SkImageInfo& info) { |
| return asSB(this)->onNewSurface(info); |
| } |
| |
| void SkSurface::draw(SkCanvas* canvas, SkScalar x, SkScalar y, |
| const SkPaint* paint) { |
| return asSB(this)->onDraw(canvas, x, y, paint); |
| } |
| |
| const void* SkSurface::peekPixels(SkImageInfo* info, size_t* rowBytes) { |
| return this->getCanvas()->peekPixels(info, rowBytes); |
| } |
| |