Image filters: fix crop rect application in SkXfermodeImageFilter.

gm/xfermodeimagefilter.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 "gm.h"
 #include "sk_tool_utils.h"
 #include "SkArithmeticMode.h"
@@ skipping 165 matching lines @@
             y += fBitmap.height() + MARGIN;
         }
         // Test small fg, large bg with Screen (uses shader blend)
         paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, nullptr));
         DrawClippedPaint(canvas, clipRect, paint, x, y);
         x += fBitmap.width() + MARGIN;
         if (x + fBitmap.width() > WIDTH) {
             x = 0;
             y += fBitmap.height() + MARGIN;
         }
+        // Test small fg, large bg with SrcIn with a crop that forces it to full size.
+        // This tests that SkXfermodeImageFilter correctly applies the compositing mode to
+        // the region outside the foreground.
+        mode = SkXfermode::Make(SkXfermode::kSrcIn_Mode);
+        SkImageFilter::CropRect cropRectFull(SkRect::MakeXYWH(0, 0, 80, 80));
+        paint.setImageFilter(SkXfermodeImageFilter::Make(mode, background, cropped, &cropRectFull));
+        DrawClippedPaint(canvas, clipRect, paint, x, y);
+        x += fBitmap.width() + MARGIN;
+        if (x + fBitmap.width() > WIDTH) {
+            x = 0;
+            y += fBitmap.height() + MARGIN;
+        }
     }
 
 private:
     static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint,
                            int x, int y) {
         canvas->save();
         canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
         canvas->clipRect(SkRect::MakeWH(
             SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height())));
         canvas->drawBitmap(bitmap, 0, 0, &paint);
@@ skipping 13 matching lines @@
     sk_sp<SkImage>  fCheckerboard;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new XfermodeImageFilterGM; );
 
 }