Image filters: change applyCropRect() to take a src rect.

src/effects/SkPaintImageFilter.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPaintImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 21 matching lines @@
     this->INHERITED::flatten(buffer);
     buffer.writePaint(fPaint);
 }
 
 bool SkPaintImageFilter::onFilterImage(Proxy* proxy,
                                             const SkBitmap& source,
                                             const Context& ctx,
                                             SkBitmap* result,
                                             SkIPoint* offset) const {
     SkIRect bounds;
-    if (!this->applyCropRect(ctx, source, SkIPoint::Make(0, 0), &bounds)) {
+    if (!this->applyCropRect(ctx, source.bounds(), &bounds)) {
         return false;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(),
                                                           bounds.height()));
     if (nullptr == device.get()) {
         return false;
     }
     SkCanvas canvas(device.get());
 
@@ skipping 19 matching lines @@
     // so we can't compute it. If a full crop rect is set, we should return true here.
     return false;
 }
 
 #ifndef SK_IGNORE_TO_STRING
 void SkPaintImageFilter::toString(SkString* str) const {
     str->appendf("SkPaintImageFilter: (");
     str->append(")");
 }
 #endif