Fix filter primitive bounds computations.

src/effects/SkOffsetImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOffsetImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 52 matching lines @@
     }
     return true;
 }
 
 void SkOffsetImageFilter::computeFastBounds(const SkRect& src, SkRect* dst) const {
     if (getInput(0)) {
         getInput(0)->computeFastBounds(src, dst);
     } else {
         *dst = src;
     }
-    SkRect copy = *dst;
     dst->offset(fOffset.fX, fOffset.fY);
-    dst->join(copy);
 }
 
-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);
+    if (kReverse_MapDirection == direction) {
+        vec.negate();
+    }
 
-    SkIRect bounds = src;
-    bounds.offset(-SkScalarCeilToInt(vec.fX), -SkScalarCeilToInt(vec.fY));
-    bounds.join(src);
-    if (getInput(0)) {
-        return getInput(0)->filterBounds(bounds, ctm, dst);
-    }
-    *dst = bounds;
-    return true;
+    *dst = src;
+    dst->offset(SkScalarCeilToInt(vec.fX), SkScalarCeilToInt(vec.fY));
 }
 
 SkFlattenable* SkOffsetImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkPoint offset;
     buffer.readPoint(&offset);
     return Create(offset.x(), offset.y(), common.getInput(0), &common.cropRect());
 }
 
 void SkOffsetImageFilter::flatten(SkWriteBuffer& buffer) const {
@@ skipping 11 matching lines @@
 void SkOffsetImageFilter::toString(SkString* str) const {
     str->appendf("SkOffsetImageFilter: (");
     str->appendf("offset: (%f, %f) ", fOffset.fX, fOffset.fY);
     str->append("input: (");
     if (this->getInput(0)) {
         this->getInput(0)->toString(str);
     }
     str->append("))");
 }
 #endif