Add a means of extracting active operations from SkPicture

src/core/SkPicturePlayback.h

Index: src/core/SkPicturePlayback.h
===================================================================
--- src/core/SkPicturePlayback.h	(revision 13766)
+++ src/core/SkPicturePlayback.h	(working copy)
@@ -85,6 +85,8 @@
 
     virtual ~SkPicturePlayback();
 
+    const SkTDArray<void*>* getActiveOps(const SkIRect& queryRect);

[bsalomon, 2014/03/13 17:59:34]

The signature seems a little dangerous to me.

[robertphillips, 2014/03/14 17:59:34]

Done. I think I have addressed your concerns here. PTAL.

+
     void draw(SkCanvas& canvas, SkDrawPictureCallback*);
 
     void serialize(SkWStream*, SkPicture::EncodeBitmap) const;
@@ -109,7 +111,7 @@
     virtual void postDraw(int opIndex);
 #endif
 
-    void preLoadBitmaps(const SkTDArray<void*>& results);
+    void preLoadBitmaps(const SkTDArray<void*>* results);
 
 private:
     class TextContainer {
@@ -237,6 +239,11 @@
     SkBBoxHierarchy* fBoundingHierarchy;
     SkPictureStateTree* fStateTree;
 
+    // The query rect for which the cached active ops are valid
+    SkIRect           fCacheQueryRect;
+    // The operations which are active within 'fCachedQueryRect'
+    SkTDArray<void*>* fCachedActiveOps;
+
     SkTypefacePlayback fTFPlayback;
     SkFactoryPlayback* fFactoryPlayback;
 #ifdef SK_BUILD_FOR_ANDROID