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Apply an xserver patch from cworth: Avoid buffer ovverrun when a 

trapezoid's right edge is on a pixel boundary.
This commit is contained in:
Eric Anholt 2005-08-30 03:05:21 +00:00
parent e321f9e7ff
commit 7777d325a3
1 changed files with 6 additions and 1 deletions
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5
fb/fbedgeimp.h
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@ -108,6 +108,11 @@ rasterizeEdges (FbBits *buf,
AddAlpha (N_X_FRAC(N_BITS)); AddAlpha (N_X_FRAC(N_BITS));
StepAlpha; StepAlpha;
} }
/* Do not add in a 0 alpha here. This check is necessary
* to avoid a buffer overrun when rx is exactly on a pixel
* boundary.
*/
if (rxs != 0)
AddAlpha (rxs); AddAlpha (rxs);
} }
} }