Bug 36102 – [Qt] Scaling control API for tiled backing store

• Status: RESOLVED
• Resolution: FIXED
• Component: New Bugs

[Antti Koivisto]

There should be way to control scaling level of the backing store from the Qt API. There should also be way to disable backing store updates temporarily (during zooming for example).

[Antti Koivisto]

Created attachment 51031 [details]
patch

[Antti Koivisto]

Created attachment 51035 [details]
QtLauncher patch 

Add animated smooth zooming to Qt launcher when in tiled mode.

[Kenneth Rohde Christiansen]

Comment on attachment 51031 [details]
patch

Please change the QGraphicsWebView::tiledBackingStoreFrozen() to isTiledBac...Frozen for consistency with Qt API, like isBlocked etc.

Also, those methods would need documentation. Apart from the it looks good to me.

[Antonio Gomes]

add dep to qt 4.7 master bug, as it introduces new API

[Antti Koivisto]

Created attachment 51043 [details]
updated patch

- document the property
- change getter to isTiledBackingStoreFrozen

[Antonio Gomes]

(In reply to comment #4)
> add dep to qt 4.7 master bug, as it introduces new API

hum not sure if it is bug 31552 or bug 35784 :). Simon?

removing for now.

[WebKit Commit Bot]

Comment on attachment 51035 [details]
QtLauncher patch 

Clearing flags on attachment: 51035

Committed r56179: <http://trac.webkit.org/changeset/56179>

[Simon Hausmann]

Comment on attachment 51043 [details]
updated patch

Landing manually, to fix the broken build.

[Simon Hausmann]

Committed r56184: <http://trac.webkit.org/changeset/56184>

[Simon Hausmann]

I observe the following effect with these patches:

When zooming in one step, the animation starts and the scrollbars disappear. Once the animation finished, the scrollbars remain invisible. In addition the CPU is stuck at 100% and the ui is unresponsive. Zooming out one step brings everything back to normal, including scrollbars and CPU usage.

[Antti Koivisto]

(In reply to comment #10)
> I observe the following effect with these patches:
> 
> When zooming in one step, the animation starts and the scrollbars disappear.
> Once the animation finished, the scrollbars remain invisible. In addition the
> CPU is stuck at 100% and the ui is unresponsive. Zooming out one step brings
> everything back to normal, including scrollbars and CPU usage.

Scrollbars will get scaled along with rest of the content so they will move out of the view on zoom. Scaling really requires graphics item based scrolling (and WebView in resizesToContents mode).

100% CPU use is obviously not expected result. Any special setup needed to see it?

[Antti Koivisto]

Repaint loop is bug 36366