Pull Gpu shader out of SkTwoPointConicalGradient into own file

src/effects/gradients/SkTwoPointConicalGradient_gpu.h

+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkTwoPointConicalGradient_gpu_DEFINED
+#define SkTwoPointconicalGradient_gpu_DEFINED
+
+#if SK_SUPPORT_GPU
+
+#include "SkGradientShaderPriv.h"
+
+class GrEffectRef;
+class SkTwoPointConicalGradient;
+class GrGL2PtConicalGradientEffect;
+
+class Gr2PtConicalGradientEffect : public GrGradientEffect {
+public:
+
+    static GrEffectRef* Create(GrContext* ctx,
+                               const SkTwoPointConicalGradient& shader,
+                               const SkMatrix& matrix,
+                               SkShader::TileMode tm) {
+        AutoEffectUnref effect(SkNEW_ARGS(Gr2PtConicalGradientEffect, (ctx, shader, matrix, tm)));
+        return CreateEffectRef(effect);
+    }
+
+    virtual ~Gr2PtConicalGradientEffect() { }
+
+    static const char* Name() { return "Two-Point Conical Gradient"; }
+    virtual const GrBackendEffectFactory& getFactory() const SK_OVERRIDE; 
+
+    // The radial gradient parameters can collapse to a linear (instead of quadratic) equation.
+    bool isDegenerate() const { return SkScalarAbs(fDiffRadius) == SkScalarAbs(fCenterX1); }
+    SkScalar center() const { return fCenterX1; }
+    SkScalar diffRadius() const { return fDiffRadius; }
+    SkScalar radius() const { return fRadius0; }
+
+    typedef GrGL2PtConicalGradientEffect GLEffect;
+
+private:
+    virtual bool onIsEqual(const GrEffect& sBase) const SK_OVERRIDE {
+        const Gr2PtConicalGradientEffect& s = CastEffect<Gr2PtConicalGradientEffect>(sBase);
+        return (INHERITED::onIsEqual(sBase) &&
+                this->fCenterX1 == s.fCenterX1 &&
+                this->fRadius0 == s.fRadius0 &&
+                this->fDiffRadius == s.fDiffRadius);
+    }
+
+    Gr2PtConicalGradientEffect(GrContext* ctx,
+                       const SkTwoPointConicalGradient& shader,
+                       const SkMatrix& matrix,
+                       SkShader::TileMode tm);
+
+    GR_DECLARE_EFFECT_TEST;
+
+    // @{
+    // Cache of values - these can change arbitrarily, EXCEPT
+    // we shouldn't change between degenerate and non-degenerate?!
+
+    GrCoordTransform fBTransform;
+    SkScalar         fCenterX1;
+    SkScalar         fRadius0;
+    SkScalar         fDiffRadius;
+
+    // @}
+
+    typedef GrGradientEffect INHERITED;
+};
+#endif
+#endif