Adding a PictureResolution option to SkPictureImageFilter

gm/pictureimagefilter.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 "SkPictureImageFilter.h"
@@ skipping 18 matching lines @@
         SkPaint paint;
         paint.setAntiAlias(true);
         sk_tool_utils::set_portable_typeface(&paint);
         paint.setColor(0xFFFFFFFF);
         paint.setTextSize(SkIntToScalar(96));
         const char* str = "e";
         canvas->drawText(str, strlen(str), SkIntToScalar(20), SkIntToScalar(70), paint);
         fPicture.reset(recorder.endRecording());
     }
 
-    virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(500, 150); }
+    virtual SkISize onISize() SK_OVERRIDE { return SkISize::Make(400, 300); }
 
     virtual void onOnceBeforeDraw() SK_OVERRIDE {
         this->makePicture();
     }
 
     static void fillRectFiltered(SkCanvas* canvas, const SkRect& clipRect, SkImageFilter* filter) {
         SkPaint paint;
         paint.setImageFilter(filter);
         canvas->save();
         canvas->clipRect(clipRect);
         canvas->drawPaint(paint);
         canvas->restore();
     }
 
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         canvas->clear(0x00000000);
         {
             SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
             SkRect emptyRect = SkRect::MakeXYWH(20, 20, 0, 0);
             SkRect bounds = SkRect::MakeXYWH(0, 0, 100, 100);
-            SkAutoTUnref<SkImageFilter> pictureSource(SkPictureImageFilter::Create(fPicture));
-            SkAutoTUnref<SkImageFilter> pictureSourceSrcRect(SkPictureImageFilter::Create(fPicture, srcRect));
-            SkAutoTUnref<SkImageFilter> pictureSourceEmptyRect(SkPictureImageFilter::Create(fPicture, emptyRect));
+            SkAutoTUnref<SkPictureImageFilter> pictureSource(
+                SkPictureImageFilter::Create(fPicture));
+            SkAutoTUnref<SkPictureImageFilter> pictureSourceSrcRect(
+                SkPictureImageFilter::Create(fPicture, srcRect));
+            SkAutoTUnref<SkPictureImageFilter> pictureSourceEmptyRect(
+                SkPictureImageFilter::Create(fPicture, emptyRect));
+            SkAutoTUnref<SkPictureImageFilter> pictureSourceResampled(
+                SkPictureImageFilter::Create(fPicture, 0, 
+                    SkPictureImageFilter::kLocalSpace_PictureResolution,
+                    SkPaint::kNone_FilterLevel));
 
+            canvas->save();
             // Draw the picture unscaled.
             fillRectFiltered(canvas, bounds, pictureSource);
             canvas->translate(SkIntToScalar(100), 0);
 
             // Draw an unscaled subset of the source picture.
             fillRectFiltered(canvas, bounds, pictureSourceSrcRect);
             canvas->translate(SkIntToScalar(100), 0);
 
             // Draw the picture to an empty rect (should draw nothing).
             fillRectFiltered(canvas, bounds, pictureSourceEmptyRect);
             canvas->translate(SkIntToScalar(100), 0);
+
+            canvas->restore();
+
+            // Draw the picture scaled
+            canvas->translate(0, SkIntToScalar(100));
+            canvas->scale(200 / srcRect.width(), 200 / srcRect.height());
+            canvas->translate(-srcRect.fLeft, -srcRect.fTop);
+            fillRectFiltered(canvas, srcRect, pictureSource);
+
+            // Draw the picture scaled, but rasterized at original resolution
+            canvas->translate(srcRect.width(), 0);
+            fillRectFiltered(canvas, srcRect, pictureSourceResampled);
         }
     }
 
     // SkPictureImageFilter doesn't support serialization yet.
     virtual uint32_t onGetFlags() const SK_OVERRIDE {
         return kSkipPicture_Flag            |
                kSkipPipe_Flag               |
                kSkipPipeCrossProcess_Flag   |
                kSkipTiled_Flag              |
                kSkipScaledReplay_Flag;
     }
 
 private:
     SkAutoTUnref<SkPicture> fPicture;
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new PictureImageFilterGM; )