Canvas refactoring phase 4b:

Add BeginPlatformPaint/EndPlatformPaint calls to gfx::Canvas. BeginPlatformPaint() returns a gfx::NativeDrawingContext.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2840029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@51297 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 18 insertions, 0 deletions

diff --git a/gfx/canvas.h b/gfx/canvas.h
index 90495cd..430a88f 100644
--- a/gfx/canvas.h
+++ b/gfx/canvas.h
@@ -184,6 +184,14 @@ class Canvas {
   virtual void TileImageInt(const SkBitmap& bitmap, int src_x, int src_y,
                             int dest_x, int dest_y, int w, int h) = 0;
 
+  // Returns a native drawing context for platform specific drawing routines to
+  // use. Must be balanced by a call to EndPlatformPaint().
+  virtual gfx::NativeDrawingContext BeginPlatformPaint() = 0;
+
+  // Signifies the end of platform drawing using the native drawing context
+  // returned by BeginPlatformPaint().
+  virtual void EndPlatformPaint() = 0;
+
   // TODO(beng): remove this once we don't need to use any skia-specific methods
   //             through this interface.
   // A quick and dirty way to obtain the underlying SkCanvas.
diff --git a/gfx/canvas_skia.cc b/gfx/canvas_skia.cc
index 28a3596..fbf26c9 100644
--- a/gfx/canvas_skia.cc
+++ b/gfx/canvas_skia.cc
@@ -298,6 +298,14 @@ void CanvasSkia::TileImageInt(const SkBitmap& bitmap, int src_x, int src_y,
   restore();
 }
 
+gfx::NativeDrawingContext CanvasSkia::BeginPlatformPaint() {
+  return beginPlatformPaint();
+}
+
+void CanvasSkia::EndPlatformPaint() {
+  endPlatformPaint();
+}
+
 CanvasSkia* CanvasSkia::AsCanvasSkia() {
   return this;
 }
diff --git a/gfx/canvas_skia.h b/gfx/canvas_skia.h
index 1648cbe..e3633a5 100644
--- a/gfx/canvas_skia.h
+++ b/gfx/canvas_skia.h
@@ -122,6 +122,8 @@ class CanvasSkia : public skia::PlatformCanvas,
   virtual void TileImageInt(const SkBitmap& bitmap, int x, int y, int w, int h);
   virtual void TileImageInt(const SkBitmap& bitmap, int src_x, int src_y,
                             int dest_x, int dest_y, int w, int h);
+  virtual gfx::NativeDrawingContext BeginPlatformPaint();
+  virtual void EndPlatformPaint();
   virtual CanvasSkia* AsCanvasSkia();
   virtual const CanvasSkia* AsCanvasSkia() const;