[Webkit-unassigned] [Bug 275806] New: [TexMap][Nicosia] Produce damage for layers repainted after animation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=275806

            Bug ID: 275806
           Summary: [TexMap][Nicosia] Produce damage for layers repainted
                    after animation
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: simon.fraser at apple.com

Transformed animated layers are painted with lower resolution while an
animation is ongoing, and re-painted after the animation has ended to
make sure they look their best at their resting position.

When using damage tracking with an output that uses device scaling != 1x
(e.g. with 2x scaling on a HiDPI screen) it is quite obvious that the
repaint at the resting position after the animation is *not* producing
damage rectangles because when damage is enabled the previous painted
contents (with less resolution) are left in place because the location
and properties of the layers have not changed. Likely we are missing
some check like “if there was a paint with different resolution then
damage the area” or similar.

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