Fix padding bug in SkTileImageFilter.

gm/tileimagefilter.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 "sk_tool_utils.h"
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkImage.h"
 #include "SkImageSource.h"
 #include "SkTileImageFilter.h"
 #include "gm.h"
 
 #define WIDTH 400
-#define HEIGHT 100
+#define HEIGHT 200
 #define MARGIN 12
 
 namespace skiagm {
 
 class TileImageFilterGM : public GM {
 public:
     TileImageFilterGM() {
         this->setBGColor(0xFF000000);
     }
 
@@ skipping 72 matching lines @@
         paint.setImageFilter(cfif);
         canvas->save();
         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
         canvas->clipRect(dstRect);
         canvas->saveLayer(&dstRect, &paint);
         canvas->drawImage(fBitmap.get(), 0, 0);
         canvas->restore();
         canvas->drawRect(srcRect, red);
         canvas->drawRect(dstRect, blue);
         canvas->restore();
+
+        canvas->translate(0, SkIntToScalar(100));
+
+        srcRect = SkRect::MakeXYWH(0, 0, 50, 50);
+        dstRect = SkRect::MakeXYWH(0, 0, 100, 100);
+        SkImageFilter::CropRect cropRect(SkRect::MakeXYWH(5, 5, 40, 40));
+        sk_sp<SkColorFilter> greenCF = SkColorFilter::MakeModeFilter(SK_ColorGREEN,
+                                                                     SkXfermode::kSrc_Mode);
+        SkAutoTUnref<SkImageFilter> green(SkColorFilterImageFilter::Create(greenCF.get(), nullptr,
+                                                                           &cropRect));
+        tile.reset(SkTileImageFilter::Create(srcRect, dstRect, green));
+        paint.setColor(SK_ColorRED);
+        paint.setImageFilter(tile);
+        canvas->drawRect(dstRect, paint);
     }
 private:
     sk_sp<SkImage> fBitmap, fCheckerboard;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new TileImageFilterGM;)
 }