3 files changed, 124 insertions, 0 deletions
diff --git a/src/effects/SkGaussianEdgeShader.cpp b/src/effects/SkGaussianEdgeShader.cpp
new file mode 100644
index 0000000000..c710b949d3
--- /dev/null
+++ b/src/effects/SkGaussianEdgeShader.cpp
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkGaussianEdgeShader.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
+
+class SkArenaAlloc;
+
+ /** \class SkGaussianEdgeShaderImpl
+ This subclass of shader applies a Gaussian to shadow edge
+
+ If the primitive supports an implicit distance to the edge, the radius of the blur is specified
+ by r & g values of the color in 14.2 fixed point. For spot shadows, we increase the stroke width
+ to set the shadow against the shape. This pad is specified by b, also in 6.2 fixed point.
+
+ When not using implicit distance, then b in the input color represents the input to the
+ blur function.
+ */
+class SkGaussianEdgeShaderImpl : public SkShaderBase {
+public:
+    SkGaussianEdgeShaderImpl() {}
+
+    bool isOpaque() const override;
+
+#if SK_SUPPORT_GPU
+    sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override;
+#endif
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkGaussianEdgeShaderImpl)
+
+protected:
+    void flatten(SkWriteBuffer&) const override;
+    Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* storage) const override {
+        return nullptr;
+    }
+private:
+    friend class SkGaussianEdgeShader;
+
+    typedef SkShaderBase INHERITED;
+};
+
+////////////////////////////////////////////////////////////////////////////
+
+#if SK_SUPPORT_GPU
+
+#include "effects/GrBlurredEdgeFragmentProcessor.h"
+
+////////////////////////////////////////////////////////////////////////////
+
+sk_sp<GrFragmentProcessor> SkGaussianEdgeShaderImpl::asFragmentProcessor(const AsFPArgs&) const {
+    return GrBlurredEdgeFP::Make(GrBlurredEdgeFP::kGaussian_Mode);
+}
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////
+
+bool SkGaussianEdgeShaderImpl::isOpaque() const {
+    return false;
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+#ifndef SK_IGNORE_TO_STRING
+void SkGaussianEdgeShaderImpl::toString(SkString* str) const {
+    str->appendf("GaussianEdgeShader: ()");
+}
+#endif
+
+sk_sp<SkFlattenable> SkGaussianEdgeShaderImpl::CreateProc(SkReadBuffer& buf) {
+    return sk_make_sp<SkGaussianEdgeShaderImpl>();
+}
+
+void SkGaussianEdgeShaderImpl::flatten(SkWriteBuffer& buf) const {
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+sk_sp<SkShader> SkGaussianEdgeShader::Make() {
+    return sk_make_sp<SkGaussianEdgeShaderImpl>();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkGaussianEdgeShader)
+SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkGaussianEdgeShaderImpl)
+SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END
+
+///////////////////////////////////////////////////////////////////////////////
diff --git a/src/effects/SkGaussianEdgeShader.h b/src/effects/SkGaussianEdgeShader.h
new file mode 100644
index 0000000000..f0554dd0a7
--- /dev/null
+++ b/src/effects/SkGaussianEdgeShader.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkGaussianEdgeShader_DEFINED
+#define SkGaussianEdgeShader_DEFINED
+
+#include "SkShaderBase.h"
+
+class SK_API SkGaussianEdgeShader {
+public:
+    /** Returns a shader that applies a Gaussian blur depending on distance to the edge
+    * Currently this is only useable with Circle and RRect shapes on the GPU backend.
+    * Raster will draw nothing.
+    */
+    static sk_sp<SkShader> Make();
+
+    SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
+
+private:
+    SkGaussianEdgeShader(); // can't be instantiated
+};
+
+#endif
diff --git a/src/ports/SkGlobalInitialization_default.cpp b/src/ports/SkGlobalInitialization_default.cpp
index de9b61ae9c..8052417ca8 100644
--- a/src/ports/SkGlobalInitialization_default.cpp
+++ b/src/ports/SkGlobalInitialization_default.cpp
@@ -22,6 +22,7 @@
 #include "SkDisplacementMapEffect.h"
 #include "SkDropShadowImageFilter.h"
 #include "../../src/effects/SkEmbossMaskFilter.h"
+#include "../../src/effects/SkGaussianEdgeShader.h"
 #include "SkGradientShader.h"
 #include "SkHighContrastFilter.h"
 #include "SkImageSource.h"
@@ -91,6 +92,7 @@ void SkFlattenable::PrivateInitializer::InitEffects() {
     SkGradientShader::InitializeFlattenables();
     SkLightingShader::InitializeFlattenables();
     SkNormalSource::InitializeFlattenables();
+    SkGaussianEdgeShader::InitializeFlattenables();
 
     // PathEffect
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArcToPathEffect)