Add check for perspective matrix in quickRejectY

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
===================================================================
--- include/core/SkCanvas.h	(revision 13449)
+++ include/core/SkCanvas.h	(working copy)
@@ -488,6 +488,13 @@
     */
     bool quickRejectY(SkScalar top, SkScalar bottom) const {
         SkASSERT(top <= bottom);
+
+        if (this->getTotalMatrix().hasPerspective()) {
+            // To correctly handle perspective we would need to forward
+            // project a rect (as in quickReject). 

[reed1, 2014/02/14 17:45:18]

// TODO -- consider implementing some half-plane test between the two Y planes
and the device-bounds

[robertphillips, 2014/02/14 18:32:40]

Done.

+            return false;
+        }
+
         const SkRect& clipR = this->getLocalClipBounds();
         // In the case where the clip is empty and we are provided with a
         // negative top and positive bottom parameter then this test will return