remove (redundant) twopointradial shader

src/pdf/SkPDFShader.cpp

Index: src/pdf/SkPDFShader.cpp
diff --git a/src/pdf/SkPDFShader.cpp b/src/pdf/SkPDFShader.cpp
index cf4188123a8fd28d9a243fb1b2ee9998160ae212..c2f0bc4677120e600f6982c1ed83749d6d7a35a1 100644
--- a/src/pdf/SkPDFShader.cpp
+++ b/src/pdf/SkPDFShader.cpp
@@ -290,58 +290,6 @@ static SkString radialCode(const SkShader::GradientInfo& info,
     return function;
 }
 
-/* The math here is all based on the description in Two_Point_Radial_Gradient,
-   with one simplification, the coordinate space has been scaled so that
-   Dr = 1.  This means we don't need to scale the entire equation by 1/Dr^2.
- */
-static SkString twoPointRadialCode(const SkShader::GradientInfo& info,
-                                   const SkMatrix& perspectiveRemover) {
-    SkScalar dx = info.fPoint[0].fX - info.fPoint[1].fX;
-    SkScalar dy = info.fPoint[0].fY - info.fPoint[1].fY;
-    SkScalar sr = info.fRadius[0];
-    SkScalar a = SkScalarMul(dx, dx) + SkScalarMul(dy, dy) - SK_Scalar1;
-    bool posRoot = info.fRadius[1] > info.fRadius[0];
-
-    // We start with a stack of (x y), copy it and then consume one copy in
-    // order to calculate b and the other to calculate c.
-    SkString function("{");
-
-    function.append(apply_perspective_to_coordinates(perspectiveRemover));
-
-    function.append("2 copy ");
-
-    // Calculate -b and b^2.
-    function.appendScalar(dy);
-    function.append(" mul exch ");
-    function.appendScalar(dx);
-    function.append(" mul add ");
-    function.appendScalar(sr);
-    function.append(" sub 2 mul neg dup dup mul\n");
-
-    // Calculate c
-    function.append("4 2 roll dup mul exch dup mul add ");
-    function.appendScalar(SkScalarMul(sr, sr));
-    function.append(" sub\n");
-
-    // Calculate the determinate
-    function.appendScalar(SkScalarMul(SkIntToScalar(4), a));
-    function.append(" mul sub abs sqrt\n");
-
-    // And then the final value of t.
-    if (posRoot) {
-        function.append("sub ");
-    } else {
-        function.append("add ");
-    }
-    function.appendScalar(SkScalarMul(SkIntToScalar(2), a));
-    function.append(" div\n");
-
-    tileModeCode(info.fTileMode, &function);
-    gradientFunctionCode(info, &function);
-    function.append("}");
-    return function;
-}
-
 /* Conical gradient shader, based on the Canvas spec for radial gradients
    See: http://www.w3.org/TR/2dcontext/#dom-context-2d-createradialgradient
  */
@@ -782,17 +730,6 @@ SkPDFFunctionShader* SkPDFFunctionShader::Create(
             transformPoints[1].fX += info->fRadius[0];
             codeFunction = &radialCode;
             break;
-        case SkShader::kRadial2_GradientType: {
-            // Bail out if the radii are the same.
-            if (info->fRadius[0] == info->fRadius[1]) {
-                return NULL;
-            }
-            transformPoints[1] = transformPoints[0];
-            SkScalar dr = info->fRadius[1] - info->fRadius[0];
-            transformPoints[1].fX += dr;
-            codeFunction = &twoPointRadialCode;
-            break;
-        }
         case SkShader::kConical_GradientType: {
             transformPoints[1] = transformPoints[0];
             transformPoints[1].fX += SK_Scalar1;
@@ -852,7 +789,7 @@ SkPDFFunctionShader* SkPDFFunctionShader::Create(
     // state.fInfo
     // in translating from x, y coordinates to the t parameter. So, we have
     // to transform the points and radii according to the calculated matrix.
-    if (state.fType == SkShader::kRadial2_GradientType) {
+    if (state.fType == SkShader::kConical_GradientType) {
         SkShader::GradientInfo twoPointRadialInfo = *info;
         SkMatrix inverseMapperMatrix;
         if (!mapperMatrix.invert(&inverseMapperMatrix)) {
@@ -1143,7 +1080,6 @@ bool SkPDFShader::State::operator==(const SkPDFShader::State& b) const {
                     return false;
                 }
                 break;
-            case SkShader::kRadial2_GradientType:
             case SkShader::kConical_GradientType:
                 if (fInfo.fPoint[1] != b.fInfo.fPoint[1] ||
                         fInfo.fRadius[0] != b.fInfo.fRadius[0] ||