[Webkit-unassigned] [Bug 264966] [GTK] Slow CSS animations and dropped frames when animating `transition-property: transform, filter; ` on `filter: opacity` with more than 2 large images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=264966

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

           What    |Removed                     |Added
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                 CC|                            |cgarcia at igalia.com

--- Comment #7 from Carlos Garcia Campos <cgarcia at igalia.com> ---
The problem is the interpolation quality, we render the images with the default interpolation quality, that uses CAIRO_FILTER_GOOD, giving high quality results but it's very slow when downscaling high resolution images. There's code in WebKit to use low interpolation quality when there's a resize animation or the view is being resized, but doesn't handle this case of CSS transition filter animation. When using the opacity property, the image is rendered once using default interpolation quality and then the effect is done by the GPU, that's why it works better.

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