Refactor various gradient effect classes

src/effects/gradients/SkSweepGradient.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 "SkSweepGradient.h"
 
 static SkMatrix translate(SkScalar dx, SkScalar dy) {
@@ skipping 107 matching lines @@
 
 /////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 #include "SkGr.h"
 #include "gl/GrGLContext.h"
 #include "glsl/GrGLSLCaps.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 
-class GrGLSweepGradient : public GrGLGradientEffect {
-public:
-
-    GrGLSweepGradient(const GrProcessor&) {}
-    virtual ~GrGLSweepGradient() { }
-
-    virtual void emitCode(EmitArgs&) override;
-
-    static void GenKey(const GrProcessor& processor, const GrGLSLCaps&, GrProcessorKeyBuilder* b) {
-        b->add32(GenBaseGradientKey(processor));
-    }
-
-private:
-
-    typedef GrGLGradientEffect INHERITED;
-
-};
-
-/////////////////////////////////////////////////////////////////////
-
 class GrSweepGradient : public GrGradientEffect {
 public:
+    class GLSLSweepProcessor;
+
     static sk_sp<GrFragmentProcessor> Make(GrContext* ctx, const SkSweepGradient& shader,
                                            const SkMatrix& m) {
         return sk_sp<GrFragmentProcessor>(new GrSweepGradient(ctx, shader, m));
     }
     virtual ~GrSweepGradient() { }
 
     const char* name() const override { return "Sweep Gradient"; }
 
 private:
     GrSweepGradient(GrContext* ctx,
                     const SkSweepGradient& shader,
                     const SkMatrix& matrix)
     : INHERITED(ctx, shader, matrix, SkShader::kClamp_TileMode) {
         this->initClassID<GrSweepGradient>();
     }
 
-    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override {
-        return new GrGLSweepGradient(*this);
-    }
+    GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
 
     virtual void onGetGLSLProcessorKey(const GrGLSLCaps& caps,
-                                       GrProcessorKeyBuilder* b) const override {
-        GrGLSweepGradient::GenKey(*this, caps, b);
-    }
+                                       GrProcessorKeyBuilder* b) const override;
 
     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
 
     typedef GrGradientEffect INHERITED;
 };
 
 /////////////////////////////////////////////////////////////////////
 
+class GrSweepGradient::GLSLSweepProcessor : public GrGradientEffect::GLSLProcessor {
+public:
+    GLSLSweepProcessor(const GrProcessor&) {}
+    virtual ~GLSLSweepProcessor() { }
+
+    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* GrSweepGradient::onCreateGLSLInstance() const {
+    return new GrSweepGradient::GLSLSweepProcessor(*this);
+}
+
+void GrSweepGradient::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
+                                            GrProcessorKeyBuilder* b) const {
+    GrSweepGradient::GLSLSweepProcessor::GenKey(*this, caps, b);
+}
+
+
+/////////////////////////////////////////////////////////////////////
+
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrSweepGradient);
 
 sk_sp<GrFragmentProcessor> GrSweepGradient::TestCreate(GrProcessorTestData* d) {
     SkPoint center = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()};
 
     SkColor colors[kMaxRandomGradientColors];
     SkScalar stopsArray[kMaxRandomGradientColors];
     SkScalar* stops = stopsArray;
     SkShader::TileMode tmIgnored;
     int colorCount = RandomGradientParams(d->fRandom, colors, &stops, &tmIgnored);
     sk_sp<SkShader> shader(SkGradientShader::MakeSweep(center.fX, center.fY,  colors, stops,
                                                        colorCount));
     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 GrGLSweepGradient::emitCode(EmitArgs& args) {
+void GrSweepGradient::GLSLSweepProcessor::emitCode(EmitArgs& args) {
     const GrSweepGradient& ge = args.fFp.cast<GrSweepGradient>();
     this->emitUniforms(args.fUniformHandler, ge);
     SkString coords2D = args.fFragBuilder->ensureFSCoords2D(args.fCoords, 0);
     SkString t;
     // 0.1591549430918 is 1/(2*pi), used since atan returns values [-pi, pi]
     // On Intel GPU there is an issue where it reads the second arguement to atan "- %s.x" as an int
     // thus must us -1.0 * %s.x to work correctly
     if (args.fGLSLCaps->mustForceNegatedAtanParamToFloat()){
         t.printf("atan(- %s.y, -1.0 * %s.x) * 0.1591549430918 + 0.5",
                  coords2D.c_str(), coords2D.c_str());
@@ skipping 41 matching lines @@
     str->appendScalar(fCenter.fX);
     str->append(", ");
     str->appendScalar(fCenter.fY);
     str->append(") ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif