[PATCH xserver] glamor: Fix dashed line rendering.

[Eric Anholt]

We were binding the screen pixmap as the dash and sampling its alpha,
which is usually just 1.0 (no dashing at all).

Please cherry-pick this to active stable branches.

Signed-off-by: Eric Anholt <eric at anholt.net>
---
 glamor/glamor_dash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/glamor/glamor_dash.c b/glamor/glamor_dash.c
index 3c19dba323c7..f3cf749a6785 100644
--- a/glamor/glamor_dash.c
+++ b/glamor/glamor_dash.c
@@ -146,7 +146,7 @@ glamor_dash_setup(DrawablePtr drawable, GCPtr gc)
         goto bail;
 
     dash_pixmap = glamor_get_dash_pixmap(gc);
-    dash_priv = glamor_get_pixmap_private(pixmap);
+    dash_priv = glamor_get_pixmap_private(dash_pixmap);
 
     if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(dash_priv))
         goto bail;
-- 
2.11.0