Image filters: Make a recursive, forward-mapping bounds traversal.

src/effects/SkComposeImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmap.h"
 #include "SkComposeImageFilter.h"
 #include "SkReadBuffer.h"
@@ skipping 30 matching lines @@
     if (!this->filterInput(0, proxy, tmp, outerContext, result, &outerOffset)) {
         return false;
     }
 
     *offset = innerOffset + outerOffset;
     return true;
 }
 
 bool SkComposeImageFilter::onFilterBounds(const SkIRect& src,
                                           const SkMatrix& ctm,
-                                          SkIRect* dst) const {
+                                          SkIRect* dst,
+                                          MapDirection direction) const {
     SkImageFilter* outer = getInput(0);
     SkImageFilter* inner = getInput(1);
 
     SkIRect tmp;
-    return inner->filterBounds(src, ctm, &tmp) && outer->filterBounds(tmp, ctm, dst);
+    return inner->filterBounds(src, ctm, &tmp, direction) &&
+           outer->filterBounds(tmp, ctm, dst, direction);
 }
 
 SkFlattenable* SkComposeImageFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2);
     return SkComposeImageFilter::Create(common.getInput(0), common.getInput(1));
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkComposeImageFilter::toString(SkString* str) const {
     SkImageFilter* outer = getInput(0);
     SkImageFilter* inner = getInput(1);
 
     str->appendf("SkComposeImageFilter: (");
 
     str->appendf("outer: ");
     outer->toString(str);
 
     str->appendf("inner: ");
     inner->toString(str);
 
     str->appendf(")");
 }
 #endif