That seems a great suggestion.

Looking for function XRenderSetPictureFilter, I have found that note :
"When you use a filter you'll probably want to use PictOpOver as the render op, regardless of whether the source picture has an alpha channel or not, since the edges may end up having alpha values after the filter has been applied."
at https://www.talisman.org/~erlkonig/misc/x11-composite-tutorial/

Do you think we should change that call too
XRenderComposite(fl_display, (has_alpha ? PictOpOver : PictOpSrc), src, None, dst, srcx, srcy, 0, 0,
XP, YP, WP, HP);
if we use FilterBilinear ?

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