Adding an option to render only the shadow in SkDropShadowImageFilter

gm/dropshadowimagefilter.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 "SkColorFilter.h"
 
@@ skipping 84 matching lines @@
 class DropShadowImageFilterGM : public skiagm::GM {
 public:
     DropShadowImageFilterGM () {}
 
 protected:
 
     virtual SkString onShortName() {
         return SkString("dropshadowimagefilter");
     }
 
-    virtual SkISize onISize() { return SkISize::Make(400, 700); }
+    virtual SkISize onISize() { return SkISize::Make(400, 656); }

[sugoi1, 2014/10/23 18:28:26]

Made the gm a bit smaller. We now have 8 filters, each 64x64, with a 16 pixel
margin, so we have 8 * (64 + 16) + 16 = 656 pixels.

 
     void draw_frame(SkCanvas* canvas, const SkRect& r) {
         SkPaint paint;
         paint.setStyle(SkPaint::kStroke_Style);
         paint.setColor(SK_ColorRED);
         canvas->drawRect(r, paint);
     }
 
     virtual uint32_t onGetFlags() const {
         // Because of the use of drawSprite, this test is excluded
@@ skipping 11 matching lines @@
         SkAutoTUnref<SkColorFilter> cf(
             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,
-            SkDropShadowImageFilter::Create(7.0f, 0.0f, 0.0f, 3.0f, SK_ColorBLUE),
-            SkDropShadowImageFilter::Create(0.0f, 7.0f, 3.0f, 0.0f, SK_ColorBLUE),
-            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE),
-            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, cfif),
-            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, NULL, &cropRect),
-            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, NULL, &bogusRect),
+            SkDropShadowImageFilter::Create(7.0f, 0.0f, 0.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
+            SkDropShadowImageFilter::Create(0.0f, 7.0f, 3.0f, 0.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
+            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode),
+            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode, cfif),
+            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode, NULL, &cropRect),
+            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode, NULL, &bogusRect),
+            SkDropShadowImageFilter::Create(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE,
+                SkDropShadowImageFilter::kDrawShadowOnly_ShadowMode),
         };
 
         SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
         SkScalar MARGIN = SkIntToScalar(16);
         SkScalar DX = r.width() + MARGIN;
         SkScalar DY = r.height() + MARGIN;
 
         canvas->translate(MARGIN, MARGIN);
         for (size_t j = 0; j < SK_ARRAY_COUNT(drawProc); ++j) {
             canvas->save();
@@ skipping 11 matching lines @@
     }
 
 private:
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new DropShadowImageFilterGM; }
 static skiagm::GMRegistry reg(MyFactory);