Added API for Bevel NormalSource.

src/core/SkNormalFlatSource.cpp

+/*
+ * 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 "SkNormalFlatSource.h"
+
+#include "SkNormalSource.h"
+#include "SkPoint3.h"
+#include "SkReadBuffer.h"
+#include "SkWriteBuffer.h"
+
+#if SK_SUPPORT_GPU
+#include "GrInvariantOutput.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+
+class NormalFlatFP : public GrFragmentProcessor {
+public:
+    NormalFlatFP() {
+        this->initClassID<NormalFlatFP>();
+    }
+
+    class GLSLNormalFlatFP : public GrGLSLFragmentProcessor {
+    public:
+        GLSLNormalFlatFP() {}
+
+        void emitCode(EmitArgs& args) override {
+            GrGLSLFragmentBuilder* fragBuilder = args.fFragBuilder;
+
+            fragBuilder->codeAppendf("%s = vec4(0, 0, 1, 0);", args.fOutputColor);
+        }
+
+        static void GenKey(const GrProcessor& proc, const GrGLSLCaps&,
+                           GrProcessorKeyBuilder* b) {
+            b->add32(0x0);
+        }
+
+    protected:
+        void onSetData(const GrGLSLProgramDataManager& pdman, const GrProcessor& proc) override {}
+    };
+
+    void onGetGLSLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const override {
+        GLSLNormalFlatFP::GenKey(*this, caps, b);
+    }
+
+    const char* name() const override { return "NormalFlatFP"; }
+
+    void onComputeInvariantOutput(GrInvariantOutput* inout) const override {
+        inout->setToUnknown(GrInvariantOutput::ReadInput::kWillNot_ReadInput);
+    }
+
+private:
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override { return new GLSLNormalFlatFP; }
+
+    bool onIsEqual(const GrFragmentProcessor& proc) const override {
+        return true;
+    }
+};
+
+sk_sp<GrFragmentProcessor> SkNormalFlatSourceImpl::asFragmentProcessor(
+        const SkShader::AsFPArgs&) const {
+
+    return sk_make_sp<NormalFlatFP>();
+}
+
+#endif // SK_SUPPORT_GPU
+
+////////////////////////////////////////////////////////////////////////////
+
+SkNormalFlatSourceImpl::Provider::Provider() {}
+
+SkNormalFlatSourceImpl::Provider::~Provider() {}
+
+SkNormalSource::Provider* SkNormalFlatSourceImpl::asProvider(const SkShader::ContextRec &rec,
+                                                           void *storage) const {
+    return new (storage) Provider();
+}
+
+size_t SkNormalFlatSourceImpl::providerSize(const SkShader::ContextRec&) const {
+    return sizeof(Provider);
+}
+
+void SkNormalFlatSourceImpl::Provider::fillScanLine(int x, int y, SkPoint3 output[],
+                                                  int count) const {
+    for (int i = 0; i < count; i++) {
+        output[i] = {0.0f, 0.0f, 1.0f};
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+sk_sp<SkFlattenable> SkNormalFlatSourceImpl::CreateProc(SkReadBuffer& buf) {
+    return sk_make_sp<SkNormalFlatSourceImpl>();
+}
+
+void SkNormalFlatSourceImpl::flatten(SkWriteBuffer& buf) const {
+    this->INHERITED::flatten(buf);
+}
+
+////////////////////////////////////////////////////////////////////////////
+
+sk_sp<SkNormalSource> SkNormalSource::MakeFlat() {
+    return sk_make_sp<SkNormalFlatSourceImpl>();
+}