Currently, I am doing something like this:
// typed in mail, not real code
NSImage *sourceImage, *cachedImage;
sourceImage = [NSImage initWithFileContents:myPath];
cachedImage = [[NSImage alloc] initWithSize:newSize];
[cachedImage lockFocus];
[sourceImage drawInRect:newRect fromRect:oldRect ...];
[cachedImage unlockfocus];
// cachedImage now contains one NSCachedImageRep
Problem is, when my custom NSView draws this image for the first time,
there's a small but noticeable lag. The second time (after I've
switched to another image, then back), it's instantaneous. I suspect
this has something to do with NSImage buffering to its offscreen
window, but I don't know how to force it do that without drawing on a
real window.
Any pointers would be appreciated, or suggestions on other ways to
solve approach this task...
-Dominic
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