Apply an xserver patch from cworth: Avoid buffer ovverrun when a
trapezoid's right edge is on a pixel boundary.
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@ -108,7 +108,12 @@ rasterizeEdges (FbBits *buf,
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AddAlpha (N_X_FRAC(N_BITS));
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StepAlpha;
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}
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AddAlpha (rxs);
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/* Do not add in a 0 alpha here. This check is necessary
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* to avoid a buffer overrun when rx is exactly on a pixel
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* boundary.
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*/
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if (rxs != 0)
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AddAlpha (rxs);
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}
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}
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#endif
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