[Webkit-unassigned] [Bug 126124] [GTK] Entering text into forms on github.com creates a trapezoid artifact

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126124

Carlos Garcia Campos <cgarcia at igalia.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|MOVED                       |---

--- Comment #19 from Carlos Garcia Campos <cgarcia at igalia.com> ---
I'm not so sure this is a cairo bug, even though it could be fixed in cairo. I think it's actually a limitation, since the case is handled in the code. See:

https://gitlab.freedesktop.org/cairo/cairo/blob/master/src/cairo-clip-polygon.c#L49

_cairo_clip_get_polygon() calls can_convert_to_polygon() and returns early with CAIRO_INT_STATUS_UNSUPPORTED if it fails. can_convert_to_polygon() simply checks that all paths in the chain have the same antialiasing. So, mixing antialiasing modes in the same clip is not actually supported by cairo. In the case of rectangle clips we are already ignoring the current antialiasing to not do any antialiasing. We could do the opposite for clips receiving a path, we want to enforce antialiasing in that case since the path might contain curves. Doing that we ensure all calls to clip with a path use the same antialiasing, which is the case of the github bug.

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