Fix clipping of SkMatrixImageFilter input

Bug: skia:7931
Change-Id: I3e424dcd5c0b04542976f4f59a5836e7c3079d06
Reviewed-on: https://skia-review.googlesource.com/127020
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/core/SkMatrixImageFilter.cpp b/src/core/SkMatrixImageFilter.cpp
index a27ca980f1..212b787d18 100644
--- a/src/core/SkMatrixImageFilter.cpp
+++ b/src/core/SkMatrixImageFilter.cpp
@@ -131,7 +131,15 @@ SkIRect SkMatrixImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatr
     matrix.postConcat(ctm);
     SkRect floatBounds;
     matrix.mapRect(&floatBounds, SkRect::Make(src));
-    return floatBounds.roundOut();
+    SkIRect result = floatBounds.roundOut();
+
+    if (kReverse_MapDirection == direction && kNone_SkFilterQuality != fFilterQuality) {
+        // When filtering we might need some pixels in the source that might be otherwise
+        // clipped off.
+        result.outset(1, 1);
+    }
+
+    return result;
 }
 
 void SkMatrixImageFilter::toString(SkString* str) const {