Hi Markus, On 8 Jan 2010, at 10:50, Markus Spoettl wrote:
Are you absolutely sure that you're not updating more than the 20 times mentioned in your initial message?
The audio back end posts a notification every 50ms to the GUI that the display needs refreshing. The GUI checks a few things first to ensure it isn't redrawing a view if it doesn't really need to.
Something doesn't add up - that load should be handled easily. You may be calling it more often that you think. Also, how many views are you updating each time the timer expires? I can imagine that if you do that on a lot of views 20 times a second the system could go down like that.
16 audio meter views need to be refreshed. A custom NSView is used as the content view for the window. That view contains a number of NSBox views - each of which contain a meter.
Also, do you really have to update the entire view each time? What speeds up drawing a lot is specifying a dirty rect as small as possible and restricting the actual drawing to the area inside the rect whenever possible. May not be relevant in your case as the bottleneck seems to be somewhere else.
I paint a CGLayer as a background/frame and then paint another layer on top of that clipped to the required level that the meter is to display. That all happens very quickly but I'll try specifying a smaller drawing rect on the off chance that something changes.
Thanks, Stephen _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
