commit d3353646c31ccb90cc43727ef0fa7869b4e4fe07
author bsalomon@google.com <bsalomon@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Oct 22 20:36:53 2012 +0000
committer bsalomon@google.com <bsalomon@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Oct 22 20:36:53 2012 +0000
tree 9c9494b27b1c68d2d9fdcb749519d773405df0c9
parent 077348cfd0b4c424393ce83cb9ceded8afe60216

Revert r6330 thru 6333 while we figure out what to do about Intel bots (possible driver bug).

git-svn-id: http://skia.googlecode.com/svn/trunk@6037 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/GrAAHairLinePathRenderer.cpp

diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 411b0e3..06d8e71 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -458,7 +458,16 @@
     if (orthVec.setLength(SK_Scalar1)) {
         orthVec.setOrthog(orthVec);
 
-        SkScalar lineC = -(a.dot(orthVec));
+        // the values we pass down to the frag shader
+        // have to be in y-points-up space;
+        SkVector normal;
+        normal.fX = orthVec.fX;
+        normal.fY = -orthVec.fY;
+        SkPoint aYDown;
+        aYDown.fX = a.fX;
+        aYDown.fY = rtHeight - a.fY;
+
+        SkScalar lineC = -(aYDown.dot(normal));
         for (int i = 0; i < kVertsPerLineSeg; ++i) {
             (*vert)[i].fPos = (i < 2) ? a : b;
             if (0 == i || 3 == i) {
@@ -466,8 +475,8 @@
             } else {
                 (*vert)[i].fPos += orthVec;
             }
-            (*vert)[i].fLine.fA = orthVec.fX;
-            (*vert)[i].fLine.fB = orthVec.fY;
+            (*vert)[i].fLine.fA = normal.fX;
+            (*vert)[i].fLine.fB = normal.fY;
             (*vert)[i].fLine.fC = lineC;
         }
         if (NULL != toSrc) {