Added skia::MakeOpaque helper function needed to rid WebKit of PlatformCanvas/Device dependency.

Review URL: http://codereview.chromium.org/6835025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81428 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 8 insertions, 0 deletions

diff --git a/skia/ext/platform_canvas.cc b/skia/ext/platform_canvas.cc
index dfb40f7..5fff062 100644
--- a/skia/ext/platform_canvas.cc
+++ b/skia/ext/platform_canvas.cc
@@ -51,6 +51,11 @@ SkCanvas* CreateBitmapCanvas(int width, int height, bool is_opaque) {
   return new PlatformCanvas(width, height, is_opaque);
 }
 
+void MakeOpaque(const SkIRect& region, SkCanvas* canvas) {
+  GetTopPlatformDevice(canvas)->makeOpaque(region.fLeft, region.fTop,
+      region.width(), region.height());
+}
+
 bool SupportsPlatformPaint(const SkCanvas* canvas) {
   // TODO(alokp): Rename PlatformDevice::IsNativeFontRenderingAllowed after
   // removing these calls from WebKit.
diff --git a/skia/ext/platform_canvas.h b/skia/ext/platform_canvas.h
index 24f613a..b8f28a9 100644
--- a/skia/ext/platform_canvas.h
+++ b/skia/ext/platform_canvas.h
@@ -119,6 +119,9 @@ class SK_API PlatformCanvas : public SkCanvas {
 // transparency: this will enable some optimizations.
 SK_API SkCanvas* CreateBitmapCanvas(int width, int height, bool is_opaque);
 
+// Sets the opacity of each pixel in the specified region to be opaque.
+SK_API void MakeOpaque(const SkIRect& region, SkCanvas* canvas);
+
 // Returns true if native platform routines can be used to draw on the
 // given canvas. If this function returns false, BeginPlatformPaint will
 // return NULL PlatformSurface.