Refactoring in SkImage implementations backed by a SkBitmap

src/image/SkImage_BitmapBase.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkImage_BitmapBase_DEFINED
+#define SkImage_BitmapBase_DEFINED
+
+#include "SkImage_Base.h"
+
+class SkBitmap;
+
+class SkImage_BitmapBase : public SkImage_Base {
+public:
+    SkImage_BitmapBase(int width, int height);
+    SkImage_BitmapBase(const SkBitmap&);
+    virtual ~SkImage_BitmapBase();
+
+    virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const SK_OVERRIDE;
+    virtual void onDrawRectToRect(SkCanvas*, const SkRect* src, const SkRect& dst,
+                                  const SkPaint*) const SK_OVERRIDE;
+
+    virtual SkShader* onNewShader(SkShader::TileMode,
+                                  SkShader::TileMode,
+                                  const SkMatrix* localMatrix) const SK_OVERRIDE;
+
+    virtual bool isOpaque() const SK_OVERRIDE;
+
+protected:
+    virtual const SkBitmap& getBitmap() const;
+
+private:
+    SkBitmap fBitmap;
+
+    typedef SkImage_Base INHERITED;
+};
+
+#endif  /* SkImage_BitmapBase_DEFINED */
+