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This patch comes from:
http://lists.x.org/archives/xorg-devel/2013-October/037996.html
Upstream-Status: Backport
Signed-off-by: Baogen shang <baogen.shang@windriver.com>
diff -Naur xorg-server-1.14.0-orig/exa/exa_render.c xorg-server-1.14.0/exa/exa_render.c
--- xorg-server-1.14.0-orig/exa/exa_render.c 2014-02-27 14:32:38.000000000 +0800
+++ xorg-server-1.14.0/exa/exa_render.c 2014-02-27 15:46:59.000000000 +0800
@@ -1141,7 +1141,8 @@
exaPrepareAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
for (; ntrap; ntrap--, traps++)
- (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1);
+ if (xTrapezoidValid(traps))
+ (*ps->RasterizeTrapezoid) (pPicture, traps, -bounds.x1, -bounds.y1);
exaFinishAccess(pPicture->pDrawable, EXA_PREPARE_DEST);
xRel = bounds.x1 + xSrc - xDst;
diff -Naur xorg-server-1.14.0-orig/render/picture.h xorg-server-1.14.0/render/picture.h
--- xorg-server-1.14.0-orig/render/picture.h 2014-02-27 14:32:26.000000000 +0800
+++ xorg-server-1.14.0/render/picture.h 2014-02-27 15:48:13.000000000 +0800
@@ -211,7 +211,7 @@
/* whether 't' is a well defined not obviously empty trapezoid */
#define xTrapezoidValid(t) ((t)->left.p1.y != (t)->left.p2.y && \
(t)->right.p1.y != (t)->right.p2.y && \
- (int) ((t)->bottom - (t)->top) > 0)
+ ((t)->bottom > (t)->top))
/*
* Standard NTSC luminance conversions:
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