#18052: Excessive flickering with master haikuwebkit
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Reporter: madmax | Owner: pulkomandy
Type: bug | Status: new
Priority: normal | Milestone: Unscheduled
Component: Kits/Web Kit | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Platform: All |
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Comment (by pulkomandy):
Personally I prefer it faster but flickering so I left it that way. It's a
step in the right direction but to stop the flicker it would need support
for locking bitmaps to tell app_server to not use them while they are
being redrawn, I discussed this with waddlesplash and he thinks it's not
possible.
With the old code from before that commit:
- webkit draws into an offscreen bitmap
- This is sent to app_server through draw_bitmap when it's ready, and
copied to the backbuffer, possibly this happens several times without any
actual screen refresh
- Then the backbuffer is copied to the frontbuffer
Surely there has to be a more efficient way to do this…
The change replaces the DrawBitmap with a SetViewBitmap, which lets
app_server control when it copies data from the offscreen bitmap to the
backbuffer (it should do it just as needed before copying to the
frontbuffer). But now it can do so while the buffer is not drawn yet, and
this results in the flickering.
If several people find this annoying let's just revert the change and wait
for someone to have a better solution.
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Ticket URL: <https://dev.haiku-os.org/ticket/18052#comment:2>
Haiku <https://dev.haiku-os.org>
The Haiku operating system.
