Added skia::SupportsPlatformPaint for webkit to query whether it can use native API to draw on a particular canvas.

Review URL: http://codereview.chromium.org/6820037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@81107 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 13 insertions, 0 deletions

diff --git a/skia/ext/platform_canvas.cc b/skia/ext/platform_canvas.cc
index 36f0e94..1ba6313 100644
--- a/skia/ext/platform_canvas.cc
+++ b/skia/ext/platform_canvas.cc
@@ -45,6 +45,14 @@ SkCanvas* CreateBitmapCanvas(int width, int height, bool is_opaque) {
   return new PlatformCanvas(width, height, is_opaque);
 }
 
+bool SupportsPlatformPaint(const SkCanvas* canvas) {
+  // All of our devices should be our special PlatformDevice.
+  PlatformDevice* device = static_cast<PlatformDevice*>(canvas->getDevice());
+  // TODO(alokp): Rename PlatformDevice::IsNativeFontRenderingAllowed after
+  // removing these calls from WebKit.
+  return device->IsNativeFontRenderingAllowed();
+}
+
 PlatformDevice::PlatformSurface BeginPlatformPaint(SkCanvas* canvas) {
   // All of our devices should be our special PlatformDevice.
   PlatformDevice* device = static_cast<PlatformDevice*>(canvas->getDevice());
diff --git a/skia/ext/platform_canvas.h b/skia/ext/platform_canvas.h
index c4d9222..24f613a 100644
--- a/skia/ext/platform_canvas.h
+++ b/skia/ext/platform_canvas.h
@@ -119,6 +119,11 @@ class SK_API PlatformCanvas : public SkCanvas {
 // transparency: this will enable some optimizations.
 SK_API SkCanvas* CreateBitmapCanvas(int width, int height, bool is_opaque);
 
+// 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.
+SK_API bool SupportsPlatformPaint(const SkCanvas* canvas);
+
 // These calls should surround calls to platform drawing routines, the
 // surface returned here can be used with the native platform routines.
 //