diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/image/SkImage_Base.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/src/image/SkImage_Base.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/*
+ * 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 SkImage_Base_DEFINED
+#define SkImage_Base_DEFINED
+
+#include "SkImage.h"
+
+class SkImage_Base : public SkImage {
+public:
+    SkImage_Base(int width, int height) : INHERITED(width, height) {}
+
+    virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) = 0;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect* src,
+                                  const SkRect& dst, const SkPaint*) = 0;
+
+    // Default impl calls onDraw
+    virtual bool onReadPixels(SkBitmap*, const SkIRect& subset) const;
+
+    virtual const void* onPeekPixels(SkImageInfo*, size_t* /*rowBytes*/) const {
+        return NULL;
+    }
+
+    virtual GrTexture* onGetTexture() { return NULL; }
+
+    // return a read-only copy of the pixels. We promise to not modify them,
+    // but only inspect them (or encode them).
+    virtual bool getROPixels(SkBitmap*) const { return false; }
+
+private:
+    typedef SkImage INHERITED;
+};
+
+#endif