Enhance SkDropShadowImageFilter to support separate X & Y sigmas, and crop rect.

gm/dropshadowimagefilter.cpp

Index: gm/dropshadowimagefilter.cpp
diff --git a/gm/imagefilterscropped.cpp b/gm/dropshadowimagefilter.cpp
similarity index 73%
copy from gm/imagefilterscropped.cpp
copy to gm/dropshadowimagefilter.cpp
index 8f023f7208e209b22403c4642f4cc8b207a6340d..6cffd5bb4a006a3ff809946f69d8533f371503fc 100644
--- a/gm/imagefilterscropped.cpp
+++ b/gm/dropshadowimagefilter.cpp
@@ -1,21 +1,15 @@
 /*
- * Copyright 2011 Google Inc.
+ * 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 "SkCanvas.h"
 #include "SkColorFilter.h"
-#include "SkColorPriv.h"
-#include "SkShader.h"
 
-#include "SkBlurImageFilter.h"
 #include "SkColorFilterImageFilter.h"
-#include "SkMergeImageFilter.h"
-#include "SkOffsetImageFilter.h"
-#include "SkTestImageFilters.h"
+#include "SkDropShadowImageFilter.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -31,12 +25,12 @@ static void draw_paint(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
 
 static void draw_path(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
     SkPaint paint;
-    paint.setColor(SK_ColorMAGENTA);
+    paint.setColor(SK_ColorGREEN);
     paint.setImageFilter(imf);
     paint.setAntiAlias(true);
     canvas->save();
     canvas->clipRect(r);
-    canvas->drawCircle(r.centerX(), r.centerY(), r.width()*2/5, paint);
+    canvas->drawCircle(r.centerX(), r.centerY(), r.width()/3, paint);
     canvas->restore();
 }
 
@@ -99,17 +93,17 @@ static void draw_sprite(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-class ImageFiltersCroppedGM : public skiagm::GM {
+class DropShadowImageFilterGM : public skiagm::GM {
 public:
-    ImageFiltersCroppedGM () {}
+    DropShadowImageFilterGM () {}
 
 protected:
 
     virtual SkString onShortName() {
-        return SkString("imagefilterscropped");
+        return SkString("dropshadowimagefilter");
     }
 
-    virtual SkISize onISize() { return SkISize::Make(400, 640); }
+    virtual SkISize onISize() { return SkISize::Make(400, 700); }
 
     void draw_frame(SkCanvas* canvas, const SkRect& r) {
         SkPaint paint;
@@ -132,25 +126,21 @@ protected:
         };
 
         SkAutoTUnref<SkColorFilter> cf(
-            SkColorFilter::CreateModeFilter(SK_ColorBLUE, SkXfermode::kSrcIn_Mode));
-        SkImageFilter::CropRect cropRect(SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)), SkImageFilter::CropRect::kHasAll_CropEdge);
-        SkImageFilter::CropRect bogusRect(SkRect::Make(SkIRect::MakeXYWH(-100, -100, 10, 10)), SkImageFilter::CropRect::kHasAll_CropEdge);
-
-        SkAutoTUnref<SkImageFilter> offset(new SkOffsetImageFilter(
-            SkIntToScalar(-10), SkIntToScalar(-10)));
-
-        SkAutoTUnref<SkImageFilter> cfOffset(SkColorFilterImageFilter::Create(cf.get(), offset.get()));
+            SkColorFilter::CreateModeFilter(SK_ColorMAGENTA, SkXfermode::kSrcIn_Mode));
+        SkAutoTUnref<SkImageFilter> cfif(SkColorFilterImageFilter::Create(cf.get()));
+        SkImageFilter::CropRect cropRect(SkRect::Make(SkIRect::MakeXYWH(10, 10, 44, 44)),
+                                         SkImageFilter::CropRect::kHasAll_CropEdge);
+        SkImageFilter::CropRect bogusRect(SkRect::Make(SkIRect::MakeXYWH(-100, -100, 10, 10)),
+                                          SkImageFilter::CropRect::kHasAll_CropEdge);
 
         SkImageFilter* filters[] = {
             NULL,
-            SkColorFilterImageFilter::Create(cf.get(), NULL, &cropRect),
-            new SkBlurImageFilter(1.0f, 1.0f, NULL, &cropRect),
-            new SkBlurImageFilter(8.0f, 0.0f, NULL, &cropRect),
-            new SkBlurImageFilter(0.0f, 8.0f, NULL, &cropRect),
-            new SkBlurImageFilter(8.0f, 8.0f, NULL, &cropRect),
-            new SkMergeImageFilter(NULL, cfOffset.get(), SkXfermode::kSrcOver_Mode, &cropRect),
-            new SkBlurImageFilter(8.0f, 8.0f, NULL, &bogusRect),
-            SkColorFilterImageFilter::Create(cf.get(), NULL, &bogusRect),
+            new SkDropShadowImageFilter(7.0f, 0.0f, 0.0f, 3.0f, SK_ColorBLUE),
+            new SkDropShadowImageFilter(0.0f, 7.0f, 3.0f, 0.0f, SK_ColorBLUE),
+            new SkDropShadowImageFilter(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE),
+            new SkDropShadowImageFilter(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, cfif),
+            new SkDropShadowImageFilter(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, NULL, &cropRect),
+            new SkDropShadowImageFilter(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, NULL, &bogusRect),
         };
 
         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
@@ -180,5 +170,5 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-static skiagm::GM* MyFactory(void*) { return new ImageFiltersCroppedGM; }
+static skiagm::GM* MyFactory(void*) { return new DropShadowImageFilterGM; }
 static skiagm::GMRegistry reg(MyFactory);