Adding an option to render only the shadow in SkDropShadowImageFilter

samplecode/SampleFilterFuzz.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 "SampleCode.h"
 #include "SkAlphaThresholdFilter.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
@@ skipping 104 matching lines @@
 }
 
 static SkXfermode::Mode make_xfermode() {
     return static_cast<SkXfermode::Mode>(R(SkXfermode::kLastMode+1));
 }
 
 static SkColor make_color() {
     return (R(2) == 1) ? 0xFFC0F0A0 : 0xFF000090;
 }
 
+static SkDropShadowImageFilter::ShadowMode make_shadow_mode() {
+    return (R(2) == 1) ? SkDropShadowImageFilter::kDrawShadowAndForeground_ShadowMode :
+                         SkDropShadowImageFilter::kDrawShadowOnly_ShadowMode;
+}
+
 static SkPoint3 make_point() {
     return SkPoint3(make_scalar(), make_scalar(), make_scalar(true));
 }
 
 static SkDisplacementMapEffect::ChannelSelectorType make_channel_selector_type() {
     return static_cast<SkDisplacementMapEffect::ChannelSelectorType>(R(4)+1);
 }
 
 static bool valid_for_raster_canvas(const SkImageInfo& info) {
     switch (info.colorType()) {
@@ skipping 198 matching lines @@
             SkPerlinNoiseShader::CreateFractalNoise(
                 make_scalar(true), make_scalar(true), R(10.0f), make_scalar()) :
             SkPerlinNoiseShader::CreateTurbulence(
                 make_scalar(true), make_scalar(true), R(10.0f), make_scalar()));
         SkImageFilter::CropRect cropR(SkRect::MakeWH(SkIntToScalar(kBitmapSize),
                                                      SkIntToScalar(kBitmapSize)));
         filter = SkRectShaderImageFilter::Create(shader, &cropR);
     }
         break;
     case DROP_SHADOW:
-        filter = SkDropShadowImageFilter::Create(make_scalar(), make_scalar(),
-                     make_scalar(true), make_scalar(true), make_color(), make_image_filter());
+        filter = SkDropShadowImageFilter::Create(make_scalar(), make_scalar(), make_scalar(true),
+                    make_scalar(true), make_color(), make_shadow_mode(), make_image_filter());
         break;
     case MORPHOLOGY:
         if (R(2) == 1) {
             filter = SkDilateImageFilter::Create(R(static_cast<float>(kBitmapSize)),
                 R(static_cast<float>(kBitmapSize)), make_image_filter());
         } else {
             filter = SkErodeImageFilter::Create(R(static_cast<float>(kBitmapSize)),
                 R(static_cast<float>(kBitmapSize)), make_image_filter());
         }
         break;
@@ skipping 120 matching lines @@
     }
 
 private:
     typedef SkView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new ImageFilterFuzzView; }
 static SkViewRegister reg(MyFactory);