Fix conics for gpu GrAAHairLinePathRender

src/gpu/GrAAHairLinePathRenderer.cpp

Index: src/gpu/GrAAHairLinePathRenderer.cpp
diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index b8c44c72d57cd53ff3e6a8c6ab61175cb71dc3c8..1dd227aa9ebd31346607e652c19196b16d0e5bd5 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -37,7 +37,7 @@
 // Each quadratic is rendered as a five sided polygon. This poly bounds
 // the quadratic's bounding triangle but has been expanded so that the
 // 1-pixel wide area around the curve is inside the poly.
-// If a,b,c are the original control points then the poly a0,b0,c0,c1,a1
+// If a,b,c are the original control points then the poly a0,a1,b0,c0,c1

[bsalomon, 2014/12/22 16:40:46]

really? a1 connects to b0? otherwise, lgtm

[egdaniel, 2014/12/22 16:52:17]

yeah we draw the two "skinny" triangles on the side and then the "large" center
one (a1, b0, c1). Basically a triangle fan with b0 as the base.

[bsalomon, 2014/12/22 17:04:46]

ok, i think the comment is describing the bounding polygon before it is turned
into a tri-whatever.

 // that is rendered would look like this:
 //              b0
 //              b
@@ -943,11 +943,12 @@ bool GrAAHairLinePathRenderer::onDrawPath(GrDrawTarget* target,
         }
 
         if (conicCnt > 0) {
-            GrDrawState::AutoRestoreEffects are(drawState);
             SkAutoTUnref<GrGeometryProcessor> hairConicProcessor(
                     GrConicEffect::Create(color, kHairlineAA_GrProcessorEdgeType, *target->caps(),
                                           newCoverage));
             SkASSERT(hairConicProcessor);
+            GrDrawState::AutoRestoreEffects are(drawState);
+            target->setIndexSourceToBuffer(fQuadsIndexBuffer);
 
             int conics = 0;
             while (conics < conicCnt) {