Fix clang static analyzer errors in Gr

Review URL: http://codereview.appspot.com/5433055/


git-svn-id: http://skia.googlecode.com/svn/trunk@2743 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/GrGpuGL.cpp

@@ -1763,8 +1763,13 @@ void GrGpuGL::flushStencil() {
             GrAssert(stencilBits ||
                      (GrStencilSettings::gDisabled ==
                       fCurrDrawState.fStencilSettings));
-            GrGLuint clipStencilMask = 1 << (stencilBits - 1);
-            GrGLuint userStencilMask = clipStencilMask - 1;
+
+            GrGLuint clipStencilMask = 0;
+            GrGLuint userStencilMask = ~0;
+            if (stencilBits > 0) {
+                clipStencilMask =  1 << (stencilBits - 1);
+                userStencilMask = clipStencilMask - 1;
+            }
 
             unsigned int frontRef  = settings->fFrontFuncRef;
             unsigned int frontMask = settings->fFrontFuncMask;

src/gpu/GrGpuGLShaders.cpp

@@ -546,7 +546,7 @@ void GrGpuGLShaders::flushRadial2(int s) {
         // down).
         float values[6] = {
             GrScalarToFloat(a),
-            1 / (2.f * values[0]),
+            1 / (2.f * GrScalarToFloat(a)),
             GrScalarToFloat(centerX1),
             GrScalarToFloat(radius0),
             GrScalarToFloat(GrMul(radius0, radius0)),