Make filters use SkImage instead of SkBitmap

tests/PDFPrimitivesTest.cpp

 /*
  * Copyright 2010 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 "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 299 matching lines @@
 
     test_issue1083();
 }
 
 namespace {
 
 class DummyImageFilter : public SkImageFilter {
 public:
     DummyImageFilter(bool visited = false) : SkImageFilter(0, NULL), fVisited(visited) {}
     ~DummyImageFilter() SK_OVERRIDE {}
-    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
-                               SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
+    virtual bool onFilterImage(Proxy*, const SkImage* src, const Context&,
+                               SkAutoTUnref<const SkImage>& result,
+                               SkIPoint* offset) const SK_OVERRIDE {
         fVisited = true;
         offset->fX = offset->fY = 0;
-        *result = src;
+        result.reset(SkRef(src));
         return true;
     }
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(DummyImageFilter)
     bool visited() const { return fVisited; }
 
 private:
     mutable bool fVisited;
 };
 
@@ skipping 24 matching lines @@
     // Filter just created; should be unvisited.
     REPORTER_ASSERT(reporter, !filter->visited());
     SkPaint paint;
     paint.setImageFilter(filter.get());
     canvas->drawRect(SkRect::MakeWH(100, 100), paint);
     doc->close();
 
     // Filter was used in rendering; should be visited.
     REPORTER_ASSERT(reporter, filter->visited());
 }