Use float rather than SkFixed for gradient TileProcs.

src/effects/gradients/SkTwoPointConicalGradient.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTwoPointConicalGradient_DEFINED
 #define SkTwoPointConicalGradient_DEFINED
 
+#include "math.h"
+
 #include "SkGradientShaderPriv.h"
 
 // TODO(dominikg): Worth making it truly immutable (i.e. set values in constructor)?
 // Should only be initialized once via init(). Immutable afterwards.
 struct TwoPtRadial {
-    enum {
-        // This value is outside the range SK_FixedMin to SK_FixedMax.
-        kDontDrawT  = 0x80000000
-    };
+    static const float kDontDrawT;
 
     float   fCenterX, fCenterY;
     float   fDCenterX, fDCenterY;
     float   fRadius;
     float   fDRadius;
     float   fA;
     float   fRadius2;
     float   fRDR;
     bool    fFlipped;
 
     void init(const SkPoint& center0, SkScalar rad0,
               const SkPoint& center1, SkScalar rad1,
               bool flipped);
 
-    static bool DontDrawT(SkFixed t) {
-        return kDontDrawT == (uint32_t)t;
+    static bool DontDrawT(float t) {
+        return isnan(t);
     }
 };
 
 
 class SkTwoPointConicalGradient : public SkGradientShaderBase {
     TwoPtRadial fRec;
 public:
     SkTwoPointConicalGradient(const SkPoint& start, SkScalar startRadius,
                               const SkPoint& end, SkScalar endRadius,
                               bool flippedGrad, const Descriptor&);
@@ skipping 40 matching lines @@
     SkPoint fCenter2;
     SkScalar fRadius1;
     SkScalar fRadius2;
     bool fFlippedGrad;
 
     friend class SkGradientShader;
     typedef SkGradientShaderBase INHERITED;
 };
 
 #endif