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exa: only draw valid trapezoids 

Fixes freedesktop.org bug https://bugs.freedesktop.org/show_bug.cgi?id=67484

If t->bottom is close to MIN_INT, removing top can wraparound, so do the check properly.
A similar fix should also be applied to pixman.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Maarten Lankhorst 2013-10-02 15:47:54 +02:00 committed by Hans de Goede
parent 2d6230e773
commit c6511d0142
2 changed files with 3 additions and 2 deletions
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3
exa/exa_render.c
View File

@ -1141,7 +1141,8 @@ exaTrapezoids(CARD8 op, PicturePtr pSrc, PicturePtr pDst,
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;

2
render/picture.h
View File

@ -211,7 +211,7 @@ typedef pixman_fixed_t xFixed;
/* 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: