[Webkit-unassigned] [Bug 197002] Defer rendering in pinch to zoom

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197002

Alexander Mikhaylenko <alexm at gnome.org> changed:

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--- Comment #15 from Alexander Mikhaylenko <alexm at gnome.org> ---
Created attachment 430823

  --> https://bugs.webkit.org/attachment.cgi?id=430823&action=review

Patch

Patch.

Some questions:

1. The non-AC mode zooming is still slow, I wonder if we should switch to AC mode with ondemand when trying to zoom?

2. We always pass the same flags to flushPendingLayerChanges() with the same condition.
   Maybe it should be a boolean/enum parameter similarly to the `enum class UpdateRenderingType { Normal, TransientZoom }` in `TiledCoreAnimationDrawingArea`?

3. We currently don't handle AC mode changes during the gesture, and honestly I don't particularly want to go into that rabbit hole. IIUC if we go with 1., it doesn't matter?

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