massive amounts of offscreen windows
massive amounts of offscreen windows
- Subject: massive amounts of offscreen windows
- From: Ev <email@hidden>
- Date: Thu, 21 Aug 2003 22:31:49 -0500
Hey everybody
I seem to be having a memory leak or issue with offscreen windows - my
app does a lot of drawing, but it does it all actively. There's no need
for me to be caching things. When my visuals scroll, I redraw them
instead of drawing the whole thing and letting a scroll bar do it's
'natural' thing - the graphics would be too large if I did that -
there's not much possibility of it drawing the same display again. I
make the drawing code super small and efficient - and it seems OK for
awhile...
But as a result, it seems that the more I use the app, it becomes
slower and slower, with disk access becoming more and more common. My
suspicions were confirmed when I looked at [[NSApp windows] count]
before I closed my app - I had 150 offscreen windows!! I would assume
sometimes there were even more...
My images are set up like this:
waveformImage = [[NSImage allocWithZone:[self zone]]
initWithSize:WaveformSize];
[waveformImage addRepresentation:[[[NSCustomImageRep alloc]
initWithDrawSelector:@selector(drawWaveform:) delegate:self]
autorelease]];
[waveformImage setCacheMode:NSImageCacheNever];
Not much surprise there, but it seems as though it *is* caching - or is
it? How can there be so many offscreen windows when they're supposed to
be freed everytime I call [waveformImage recache]? Is it saving every
small scrolling image I draw as an offscreen window, and never getting
rid of it?
Anybody have any insight?
-ev
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