More info,
This migh be ovious, but:
I have found out that if I don't modify any of the layers while
dragging a window about - then things stay very stable and look good.
Probably no great surprise. But as soon as I change the colour of a
line for example, flickering occurs like mad.
I first thought maybe I was being silly and changing the colour many
times per second, thus causing the flickering myself - but logging
suggests that isn't the case.
Ideas / suggestions welcome...
--
John
On 28/04/2008, at 3:28 PM, John Clayton wrote:
Hi
I've created a borderless NSWindow that is used to draw a grid (via
CALayer instances - each line is a CALayer instance). The window is
shown at the Screen Saver window level, thus overlapping
everything. In my tests there are 3 or 4 lines in either direction,
i.e. we're not talking about thousands of layers here.
When my grid window is being shown - and I move other applications
around underneath it, I see flickering of the grid image lines. To
me it looks like the shadow of a window (created via the window
manager of course) is overwriting my grid lines briefly, but they do
get re-drawn again.
To view this behaviour, check this link - I've created a movie to
show this. Of note is:
- the yellow line that appears is one of the layers
- it fades in/out
- it appears to be chopped in half, watch the differences between
the left hand portion of the line and the right hand, the redraw is
horizontally very uneven.
link:
http://gallery.mac.com/john_clayton/100132
Each line is one layer CALayer instance, with a border width of 1
and a filters property set to use a bloom.
Has anyone seen this kind of behaviour before? I'd appreciate any
tips that might lead to a solution I can share.
Thanks
--
John Clayton
http://www.coderage-software.com/
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