Refactor various gradient effect classes

src/effects/gradients/SkRadialGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkRadialGradient.h"
 #include "SkNx.h"
 
@@ skipping 224 matching lines @@
 }
 
 /////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 #include "SkGr.h"
 #include "glsl/GrGLSLCaps.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 
-class GrGLRadialGradient : public GrGLGradientEffect {
-public:
-
-    GrGLRadialGradient(const GrProcessor&) {}
-    virtual ~GrGLRadialGradient() { }
-
-    virtual void emitCode(EmitArgs&) override;
-
-    static void GenKey(const GrProcessor& processor, const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
-        b->add32(GenBaseGradientKey(processor));
-    }
-
-private:
-
-    typedef GrGLGradientEffect INHERITED;
-
-};
-
-/////////////////////////////////////////////////////////////////////
-
 class GrRadialGradient : public GrGradientEffect {
 public:
+    class GLSLRadialProcessor;
+
     static sk_sp<GrFragmentProcessor> Make(GrContext* ctx,
                                            const SkRadialGradient& shader,
                                            const SkMatrix& matrix,
                                            SkShader::TileMode tm) {
         return sk_sp<GrFragmentProcessor>(new GrRadialGradient(ctx, shader, matrix, tm));
     }
 
     virtual ~GrRadialGradient() { }
 
     const char* name() const override { return "Radial Gradient"; }
 
 private:
     GrRadialGradient(GrContext* ctx,
                      const SkRadialGradient& shader,
                      const SkMatrix& matrix,
                      SkShader::TileMode tm)
         : INHERITED(ctx, shader, matrix, tm) {
         this->initClassID<GrRadialGradient>();
     }
 
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
-        return new GrGLRadialGradient(*this);
-    }
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
 
     virtual void onGetGLSLProcessorKey(const GrGLSLCaps& caps,
-                                       GrProcessorKeyBuilder* b) const override {
-        GrGLRadialGradient::GenKey(*this, caps, b);
-    }
+                                       GrProcessorKeyBuilder* b) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrGradientEffect INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////
 
+class GrRadialGradient::GLSLRadialProcessor : public GrGradientEffect::GLSLProcessor {
+public:
+    GLSLRadialProcessor(const GrProcessor&) {}
+    virtual ~GLSLRadialProcessor() { }
+
+    virtual void emitCode(EmitArgs&) override;
+
+    static void GenKey(const GrProcessor& processor, const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
+        b->add32(GenBaseGradientKey(processor));
+    }
+
+private:
+    typedef GrGradientEffect::GLSLProcessor INHERITED;
+
+};
+
+/////////////////////////////////////////////////////////////////////
+
+GrGLSLFragmentProcessor* GrRadialGradient::onCreateGLSLInstance() const {
+    return new GrRadialGradient::GLSLRadialProcessor(*this);
+}
+
+void GrRadialGradient::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+                                             GrProcessorKeyBuilder* b) const {
+    GrRadialGradient::GLSLRadialProcessor::GenKey(*this, caps, b);
+}
+
+/////////////////////////////////////////////////////////////////////
+
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrRadialGradient);
 
 sk_sp<GrFragmentProcessor> GrRadialGradient::TestCreate(GrProcessorTestData* d) {
     SkPoint center = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()};
     SkScalar radius = d->fRandom->nextUScalar1();
 
     SkColor colors[kMaxRandomGradientColors];
     SkScalar stopsArray[kMaxRandomGradientColors];
     SkScalar* stops = stopsArray;
     SkShader::TileMode tm;
     int colorCount = RandomGradientParams(d->fRandom, colors, &stops, &tm);
     auto shader = SkGradientShader::MakeRadial(center, radius, colors, stops, colorCount, tm);
     SkMatrix viewMatrix = GrTest::TestMatrix(d->fRandom);
     sk_sp<GrFragmentProcessor> fp = shader->asFragmentProcessor(SkShader::AsFPArgs(
         d->fContext, &viewMatrix, NULL, kNone_SkFilterQuality, nullptr,
         SkSourceGammaTreatment::kRespect));
     GrAlwaysAssert(fp);
     return fp;
 }
 
 /////////////////////////////////////////////////////////////////////
 
-void GrGLRadialGradient::emitCode(EmitArgs& args) {
+void GrRadialGradient::GLSLRadialProcessor::emitCode(EmitArgs& args) {
     const GrRadialGradient& ge = args.fFp.cast<GrRadialGradient>();
     this->emitUniforms(args.fUniformHandler, ge);
     SkString t("length(");
     t.append(args.fFragBuilder->ensureFSCoords2D(args.fCoords, 0));
     t.append(")");
     this->emitColor(args.fFragBuilder,
                     args.fUniformHandler,
                     args.fGLSLCaps,
                     ge, t.c_str(),
                     args.fOutputColor,
@@ skipping 35 matching lines @@
     str->appendScalar(fCenter.fY);
     str->append(") radius: ");
     str->appendScalar(fRadius);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif