[libGD] #79 [Comment added] arc's are drawn incorrectly (plus regression in 2.0.35RC2)

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FS#79 - arc's are drawn incorrectly (plus regression in 2.0.35RC2)
User who did this - Pierre Joye (Pierre)

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> The problem does not happen if gdAntiAliased is not used.

Ok, the antialias multiple blending ends with a horrible result in gdImageArc and without any antialiasing effect (still jaggy anyway).

The attached patch fixes the issue. I think it is a good way to solve the problem without loosing the actual fix in gdImageAALine for axis aligned lines.

The previous versions did not draw arcs pixels using only black. I think it is an acceptable change given that it never works well anyway.
Is it good enough in your case? 



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