new edgelist builder that chops segments into clip-sized coordinates, to avoid overflows

The change is conditional at the moment inside SkScan_Path.cpp, USE_NEW_BUILDER.

This chopping is meant to only pass in reasonable floats to the edgelist, so that we never
overflow when converting to fixed-point. It also has the side-effect of speeding up edges
to the left/right of the clip, since those become vertical lines, which are faster to
walk over than the original curve segment.

Future optimizations: throw away segments to the right of the clip, and tweak the edgelist
walker to not require an explicit matching right-edge for the current run.

1 files changed, 7 insertions, 1 deletions

diff --git a/include/views/SkView.h b/include/views/SkView.h
index 1bdd0b6..f3b729f 100644
--- a/include/views/SkView.h
+++ b/include/views/SkView.h
@@ -314,7 +314,13 @@ protected:
 
     /** Override this if you might handle the click
     */
-    virtual Click*  onFindClickHandler(SkScalar x, SkScalar y);
+    virtual Click* onFindClickHandler(SkScalar x, SkScalar y);
+    /** Override this to decide if your children are targets for a click.
+        The default returns true, in which case your children views will be
+        candidates for onFindClickHandler. Returning false wil skip the children
+        and just call your onFindClickHandler.
+     */
+    virtual bool onSendClickToChildren(SkScalar x, SkScalar y);
     /** Override this to track clicks, returning true as long as you want to track
         the pen/mouse.
     */