Implement SkBaseDevice snapshot support

src/utils/SkDeferredCanvas.cpp

 
 /*
  * 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 "SkDeferredCanvas.h"
 
@@ skipping 241 matching lines @@
     bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE {
         return false;
     }
     virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
                              const SkImageFilter::Context&, SkBitmap*, SkIPoint*) SK_OVERRIDE {
         return false;
     }
 
 private:
     void flush() SK_OVERRIDE;
-    void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {}
+    void replaceBitmapBackend(const SkBitmap&) SK_OVERRIDE {}
 
     void beginRecording();
     void init();
     void aboutToDraw();
     void prepareForImmediatePixelWrite();
 
     DeferredPipeController fPipeController;
     SkGPipeWriter  fPipeWriter;
     SkCanvas* fImmediateCanvas;
     SkCanvas* fRecordingCanvas;
@@ skipping 73 matching lines @@
 bool SkDeferredDevice::hasPendingCommands() {
     return fPipeController.hasPendingCommands();
 }
 
 void SkDeferredDevice::aboutToDraw()
 {
     if (fNotificationClient) {
         fNotificationClient->prepareForDraw();
     }
     if (fCanDiscardCanvasContents) {
-        if (fSurface) {
-            fSurface->notifyContentWillChange(SkSurface::kDiscard_ContentChangeMode);
-        }
+        fImmediateCanvas->discard();
         fCanDiscardCanvasContents = false;
     }
 }
 
 void SkDeferredDevice::flushPendingCommands(PlaybackMode playbackMode) {
     if (!fPipeController.hasPendingCommands()) {
         return;
     }
     if (playbackMode == kNormal_PlaybackMode) {
         aboutToDraw();
@@ skipping 68 matching lines @@
     return immediateDevice()->accessRenderTarget();
 }
 
 void SkDeferredDevice::prepareForImmediatePixelWrite() {
     // The purpose of the following code is to make sure commands are flushed, that
     // aboutToDraw() is called and that notifyContentWillChange is called, without
     // calling anything redundantly.
     if (fPipeController.hasPendingCommands()) {
         this->flushPendingCommands(kNormal_PlaybackMode);
     } else {
-        bool mustNotifyDirectly = !fCanDiscardCanvasContents;
         this->aboutToDraw();
-        if (mustNotifyDirectly) {
-            fSurface->notifyContentWillChange(SkSurface::kRetain_ContentChangeMode);
-        }
     }
 
     fImmediateCanvas->flush();
 }
 
 bool SkDeferredDevice::onWritePixels(const SkImageInfo& info, const void* pixels, size_t rowBytes,
                                    int x, int y) {
     SkASSERT(x >= 0 && y >= 0);
     SkASSERT(x + info.width() <= width());
     SkASSERT(y + info.height() <= height());
@@ skipping 517 matching lines @@
 SkDrawFilter* SkDeferredCanvas::setDrawFilter(SkDrawFilter* filter) {
     this->drawingCanvas()->setDrawFilter(filter);
     this->INHERITED::setDrawFilter(filter);
     this->recordedDrawCommand();
     return filter;
 }
 
 SkCanvas* SkDeferredCanvas::canvasForDrawIter() {
     return this->drawingCanvas();
 }