check matrix does not have rotation or perspective transformation

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 607d3c3cc7144788da553418b599084842bb7582..e6d51f281dc7d401c3c21ba56bcd79db53b6e671 100755
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -650,6 +650,9 @@ static bool apply_aa_to_rect(GrDrawTarget* target,
 #endif
 
     combinedMatrix.mapRect(devBoundRect, rect);
+    if (!combinedMatrix.rectStaysRect())

[bsalomon, 2014/12/02 21:36:56]

style nit: we always use { }.

Otherwise, lgtm

+        return true;
+
     if (strokeWidth < 0) {
         return !is_irect(*devBoundRect);
     }