add SkImage::newSurface

src/image/SkImage_Raster.cpp

Index: src/image/SkImage_Raster.cpp
diff --git a/src/image/SkImage_Raster.cpp b/src/image/SkImage_Raster.cpp
index 18d6a8cabb2bd871292021c94375becdcda4221e..5c576389ae6d6f19c5842962ec120e14697838f2 100644
--- a/src/image/SkImage_Raster.cpp
+++ b/src/image/SkImage_Raster.cpp
@@ -11,6 +11,7 @@
 #include "SkCanvas.h"
 #include "SkData.h"
 #include "SkDecodingImageGenerator.h"
+#include "SkSurface.h"
 
 class SkImage_Raster : public SkImage_Base {
 public:
@@ -53,12 +54,12 @@ public:
     SkImage_Raster(const SkImageInfo&, SkData*, size_t rb);
     virtual ~SkImage_Raster();
 
-    virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) const SK_OVERRIDE;
-    virtual void onDrawRect(SkCanvas*, const SkRect*, const SkRect&,
-                                  const SkPaint*) const SK_OVERRIDE;
-    virtual bool onReadPixels(SkBitmap*, const SkIRect&) const SK_OVERRIDE;
-    virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
-    virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
+    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(SkBitmap*, const SkIRect&) const SK_OVERRIDE;
+    const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const SK_OVERRIDE;
+    bool getROPixels(SkBitmap*) const SK_OVERRIDE;
 
     // exposed for SkSurface_Raster via SkNewImageFromPixelRef
     SkImage_Raster(const SkImageInfo&, SkPixelRef*, size_t rowBytes);
@@ -136,6 +137,10 @@ void SkImage_Raster::onDrawRect(SkCanvas* canvas, const SkRect* src, const SkRec
     canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
 }
 
+SkSurface* SkImage_Raster::onNewSurface(const SkImageInfo& info, const SkSurfaceProps& props) const {
+    return SkSurface::NewRaster(info, &props);
+}
+
 bool SkImage_Raster::onReadPixels(SkBitmap* dst, const SkIRect& subset) const {
     if (dst->pixelRef()) {
         return this->INHERITED::onReadPixels(dst, subset);