Plumbing to propagate save & restore from SkCanvas down to GrContext & lower

http://codereview.appspot.com/6203067/



git-svn-id: http://skia.googlecode.com/svn/trunk@4034 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 14 insertions, 0 deletions

diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index db9c542ada..1e4e0a3166 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -351,6 +351,20 @@ private:
     friend class SkDeviceFilteredPaint;
     friend class DeviceImageFilterProxy;
 
+    /**
+     * postSave is called by SkCanvas to inform the device that it has
+     * just completed a save operation. This allows derived
+     * classes to initialize their state-dependent caches.
+     */
+    virtual void postSave() {};
+
+    /**
+     * preRestore is called by SkCanvas right before it executes a restore
+     * operation. As the partner of postSave, it allows
+     * derived classes to clear their state-dependent caches.
+     */
+    virtual void preRestore() {};
+
     // just called by SkCanvas when built as a layer
     void setOrigin(int x, int y) { fOrigin.set(x, y); }
     // just called by SkCanvas for saveLayer