[Webkit-unassigned] [Bug 193239] [GTK][WPE] Graphic issue with invalidations on composited layers with subpixel positions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193239

--- Comment #11 from Loïc Yhuel <loic.yhuel at softathome.com> ---
(In reply to Zan Dobersek from comment #10)
> Is this bug related in some way to bug #192554?

These are two issues we see with subpixel positions and AC layers.
Perhaps there is a common solution which would round-up the coordinates earlier, but we don't see it.

Sometimes the repaint rect is too small : changing the background color of a div would invalidate a rectangle smaller than the one used to draw the background, leaving one pixel line of the previous color (this is this bug).

Sometimes the positions seem incorrect, leaving a blank line between two consecutive blocks.
This is for example a scrolling list, where two consecutive items may be spaced by a pixel line or not during the transition, showing artifacts (a line of the background behind the items) and/or wobbling (the relative positions of two items varies by 1 pixel).

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