initial preroll api

src/image/SkImage_Raster.cpp

 /*
  * 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 "SkImage_Base.h"
 #include "SkImagePriv.h"
 #include "SkBitmap.h"
@@ skipping 40 matching lines @@
 
     SkImage_Raster(const SkImageInfo&, SkData*, size_t rb, const SkSurfaceProps*);
     virtual ~SkImage_Raster();
 
     void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) const SK_OVERRIDE;
     void onDrawRect(SkCanvas*, const SkRect*, const SkRect&, const SkPaint*) const SK_OVERRIDE;
     SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) const SK_OVERRIDE;
     bool onReadPixels(const SkImageInfo&, void*, size_t, int srcX, int srcY) const SK_OVERRIDE;
     const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
     bool getROPixels(SkBitmap*) const SK_OVERRIDE;
+    void onPreroll() const SK_OVERRIDE;
 
     // exposed for SkSurface_Raster via SkNewImageFromPixelRef
     SkImage_Raster(const SkImageInfo&, SkPixelRef*, size_t rowBytes, const SkSurfaceProps*);
 
     SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
 
     virtual SkShader* onNewShader(SkShader::TileMode,
                                   SkShader::TileMode,
                                   const SkMatrix* localMatrix) const SK_OVERRIDE;
 
@@ skipping 76 matching lines @@
     *infoPtr = info;
     *rowBytesPtr = fBitmap.rowBytes();
     return fBitmap.getPixels();
 }
 
 bool SkImage_Raster::getROPixels(SkBitmap* dst) const {
     *dst = fBitmap;
     return true;
 }
 
+void SkImage_Raster::onPreroll() const {
+    SkBitmap bm(fBitmap);
+    bm.lockPixels();
+    bm.unlockPixels();
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 SkImage* SkImage::NewRasterCopy(const SkImageInfo& info, const void* pixels, size_t rowBytes) {
     if (!SkImage_Raster::ValidArgs(info, rowBytes) || !pixels) {
         return NULL;
     }
 
     // Here we actually make a copy of the caller's pixel data
     SkAutoDataUnref data(SkData::NewWithCopy(pixels, info.height() * rowBytes));
     return SkNEW_ARGS(SkImage_Raster, (info, data, rowBytes, NULL));
@@ skipping 34 matching lines @@
     return SkNEW_ARGS(SkImage_Raster, (info, pr, rowBytes, props));
 }
 
 const SkPixelRef* SkBitmapImageGetPixelRef(const SkImage* image) {
     return ((const SkImage_Raster*)image)->getPixelRef();
 }
 
 bool SkImage_Raster::isOpaque() const {
     return fBitmap.isOpaque();
 }
+