Add implicit hairline conic rendering to GPU

include/core/SkGeometry.h

Index: include/core/SkGeometry.h
diff --git a/include/core/SkGeometry.h b/include/core/SkGeometry.h
index 38cdf6e9b358386fe467ce0383650a65b829decf..b23989ffb5293e34a1148eeaa57466ffac8758af 100644
--- a/include/core/SkGeometry.h
+++ b/include/core/SkGeometry.h
@@ -72,6 +72,12 @@ int SkFindQuadExtrema(SkScalar a, SkScalar b, SkScalar c, SkScalar tValues[1]);
 int SkChopQuadAtYExtrema(const SkPoint src[3], SkPoint dst[5]);
 int SkChopQuadAtXExtrema(const SkPoint src[3], SkPoint dst[5]);
 
+/** Given 3 points on a quadratic bezier, if the point of maximum
+    curvature exists on the segment, returns the t value for this
+    point along the curve. Otherwise it will return a value of 0.
+*/
+float SkGetTQuadAtMaxCurvature(const SkPoint src[3]);

[bsalomon, 2013/07/10 15:14:36]

It read don't right.

SkGetQuadTAtMaxCurvature?
SkGetQuadMaxCurvatureT?

[reed1, 2013/07/10 16:00:37]

SkFindQuadMaxCurvature

+
 /** Given 3 points on a quadratic bezier, divide it into 2 quadratics
     if the point of maximum curvature exists on the quad segment.
     Depending on what is returned, dst[] is treated as follows