commit 4fe9b1b7406f8e29102287c4594ef8cf733513a7
author bsalomon@google.com <bsalomon@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Oct 22 17:40:14 2012 +0000
committer bsalomon@google.com <bsalomon@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81> Mon Oct 22 17:40:14 2012 +0000
tree a211726c331170159a73ccf344b521597c22ff26
parent c2e8cef4792b478547973d312b26fff4aab7c729

Automatically handle converting gl_FragCoord to Skia's y-down device coords.

NOTE: THIS WILL LIKELY REQUIRE GM REBASELINING.

R=robertphillips@google.com,senorblanco@chromium.org
Review URL: https://codereview.appspot.com/6744061

git-svn-id: http://skia.googlecode.com/svn/trunk@6030 2bbb7eff-a529-9590-31e7-b0007b416f81

src/gpu/GrAAHairLinePathRenderer.cpp

diff --git a/src/gpu/GrAAHairLinePathRenderer.cpp b/src/gpu/GrAAHairLinePathRenderer.cpp
index 06d8e71..411b0e3 100644
--- a/src/gpu/GrAAHairLinePathRenderer.cpp
+++ b/src/gpu/GrAAHairLinePathRenderer.cpp
@@ -458,16 +458,7 @@
     if (orthVec.setLength(SK_Scalar1)) {
         orthVec.setOrthog(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));
+        SkScalar lineC = -(a.dot(orthVec));
         for (int i = 0; i < kVertsPerLineSeg; ++i) {
             (*vert)[i].fPos = (i < 2) ? a : b;
             if (0 == i || 3 == i) {
@@ -475,8 +466,8 @@
             } else {
                 (*vert)[i].fPos += orthVec;
             }
-            (*vert)[i].fLine.fA = normal.fX;
-            (*vert)[i].fLine.fB = normal.fY;
+            (*vert)[i].fLine.fA = orthVec.fX;
+            (*vert)[i].fLine.fB = orthVec.fY;
             (*vert)[i].fLine.fC = lineC;
         }
         if (NULL != toSrc) {