SkPDF Implement colorfilters on bitmaps

gm/colorfilterimagefilter.cpp

 /*
  * Copyright 2012 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 "SkCanvas.h"
 #include "SkColorMatrixFilter.h"
@@ skipping 99 matching lines @@
             drawClippedRect(canvas, r, paint, 3);
             canvas->translate(FILTER_WIDTH + MARGIN, 0);
         }
         {
             SkAutoTUnref<SkImageFilter> blue(make_mode_blue());
             paint.setImageFilter(blue.get());
             drawClippedRect(canvas, r, paint, 5);
             canvas->translate(FILTER_WIDTH + MARGIN, 0);
         }
 }
+
+DEF_SIMPLE_GM(colorfilterimagefilter_layer, canvas, 32, 32) {
+    SkAutoCanvasRestore autoCanvasRestore(canvas, false);
+    SkColorMatrix cm;
+    cm.setSaturation(0.0f);
+    SkAutoTUnref<SkColorFilter> cf(SkColorMatrixFilter::Create(cm));
+    SkAutoTUnref<SkImageFilter> imf(SkColorFilterImageFilter::Create(cf));
+    SkPaint p;
+    p.setImageFilter(imf);
+    canvas->saveLayer(NULL, &p);
+    canvas->clear(SK_ColorRED);
+}