Hi All,
I'm looking for some suggestions in speeding up image display.
This bit of code is called when a table view selection changes.
It can take 2-4 seconds for the image to be displayed in a
related NSImageView.
- (void) showImageForIndex: (NSInteger) ix
{
NSImage *image = nil;
if (ix != -1) {
image = [[self imageAtIndex: ix] image];
...
}
[imageWell setImage: image];
}
imageWell is defined as
IBOutlet NSImageView *imageWell;
The images are typically 25 MB Canon 7D raw image files that have
been pre-alloc'ed and initWithContentsOfFile:
The NSImageView is about 600x400 pixels.
Instruments says the time is being spent by raw image processing.
It looks like the delay is in [imageWell setImage: image];
This is logged during the delay...
Aug 14 11:50:35 dumbcat.snafu.org WindowServer[121]: CGXDisableUpdate: UI
updates were forcibly disabled by application "test" for over 1.00 seconds.
Server has re-enabled them.
Aug 14 11:50:37 dumbcat.snafu.org WindowServer[121]:
reenable_update_for_connection: UI updates were finally reenabled by
application "test" after 2.31 seconds (server forcibly re-enabled them after
1.00 seconds)
The logs show that Apple's Aperture also has long delays preparing
7D raw images for viewing. Perhaps I am just asking too much from a
2007 model iMac.
Marc
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