Fix filter primitive bounds computations.

src/effects/SkOffsetImageFilter.cpp

Index: src/effects/SkOffsetImageFilter.cpp
diff --git a/src/effects/SkOffsetImageFilter.cpp b/src/effects/SkOffsetImageFilter.cpp
index 9da026b2793b8998a321cacb20cb9cf6d1e4591b..c4fc5ebe304eea1eb02da771489527221376515f 100644
--- a/src/effects/SkOffsetImageFilter.cpp
+++ b/src/effects/SkOffsetImageFilter.cpp
@@ -70,24 +70,28 @@ void SkOffsetImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) cons
     } else {
         *dst = src;
     }
+#ifdef SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS
     SkRect copy = *dst;
+#endif
     dst->offset(fOffset.fX, fOffset.fY);
+#ifdef SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS
     dst->join(copy);
+#endif
 }
 
-bool SkOffsetImageFilter::onFilterBounds(const SkIRect& src, const SkMatrix& ctm,
-                                         SkIRect* dst) const {
+void SkOffsetImageFilter::onFilterNodeBounds(const SkIRect& src, const SkMatrix& ctm,
+                                             SkIRect* dst, MapDirection direction) const {
     SkVector vec;
     ctm.mapVectors(&vec, &fOffset, 1);
-
-    SkIRect bounds = src;
-    bounds.offset(-SkScalarCeilToInt(vec.fX), -SkScalarCeilToInt(vec.fY));
-    bounds.join(src);
-    if (getInput(0)) {
-        return getInput(0)->filterBounds(bounds, ctm, dst);
+    if (kReverse_MapDirection == direction) {
+        vec.negate();
     }
-    *dst = bounds;
-    return true;
+
+    *dst = src;
+    dst->offset(SkScalarCeilToInt(vec.fX), SkScalarCeilToInt(vec.fY));
+#ifdef SK_SUPPORT_SRC_BOUNDS_BLOAT_FOR_IMAGEFILTERS
+    dst->join(src);
+#endif
 }
 
 SkFlattenable* SkOffsetImageFilter::CreateProc(SkReadBuffer& buffer) {