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

src/effects/SkDropShadowImageFilter.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 "SkDropShadowImageFilter.h"
 
 #include "SkBitmap.h"
@@ skipping 44 matching lines @@
 
 bool SkDropShadowImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& source,
                                             const Context& ctx,
                                             SkBitmap* result, SkIPoint* offset) const
 {
     SkBitmap src = source;
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     if (!this->filterInput(0, proxy, source, ctx, &src, &srcOffset))
         return false;
 
+    SkIRect srcBounds = src.bounds();
+    srcBounds.offset(srcOffset);
     SkIRect bounds;
-    if (!this->applyCropRect(ctx, src, srcOffset, &bounds)) {
+    if (!this->applyCropRect(ctx, srcBounds, &bounds)) {
         return false;
     }
 
     SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(bounds.width(), bounds.height()));
     if (nullptr == device.get()) {
         return false;
     }
     SkCanvas canvas(device.get());
 
     SkVector sigma = SkVector::Make(fSigmaX, fSigmaY);
@@ skipping 74 matching lines @@
         "kDrawShadowAndForeground", "kDrawShadowOnly"
     };
 
     static_assert(kShadowModeCount == SK_ARRAY_COUNT(gModeStrings), "enum_mismatch");
 
     str->appendf(" mode: %s", gModeStrings[fShadowMode]);
 
     str->append(")");
 }
 #endif