Add drawRegion() API to SkCanvas

include/core/SkDevice.h

 /*
  * Copyright 2010 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 141 matching lines @@
     /** These are called inside the per-device-layer loop for each draw call.
      When these are called, we have already applied any saveLayer operations,
      and are handling any looping from the paint, and any effects from the
      DrawFilter.
      */
     virtual void drawPaint(const SkDraw&, const SkPaint& paint) = 0;
     virtual void drawPoints(const SkDraw&, SkCanvas::PointMode mode, size_t count,
                             const SkPoint[], const SkPaint& paint) = 0;
     virtual void drawRect(const SkDraw&, const SkRect& r,
                           const SkPaint& paint) = 0;
+    virtual void drawRegion(const SkDraw&, const SkRegion& r,
+                            const SkPaint& paint);
     virtual void drawOval(const SkDraw&, const SkRect& oval,
                           const SkPaint& paint) = 0;
     /** By the time this is called we know that abs(sweepAngle) is in the range [0, 360). */
     virtual void drawArc(const SkDraw&, const SkRect& oval, SkScalar startAngle,
                          SkScalar sweepAngle, bool useCenter, const SkPaint& paint);
     virtual void drawRRect(const SkDraw&, const SkRRect& rr,
                            const SkPaint& paint) = 0;
 
     // Default impl calls drawPath()
     virtual void drawDRRect(const SkDraw&, const SkRRect& outer,
@@ skipping 210 matching lines @@
     const SkSurfaceProps fSurfaceProps;
 
 #ifdef SK_SUPPORT_LEGACY_ACCESSBITMAP
     SkBitmap    fLegacyBitmap;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif