image drawing glitch
image drawing glitch
- Subject: image drawing glitch
- From: Jesse Grosjean <email@hidden>
- Date: Sun, 7 Nov 2004 20:19:56 -0500
On this page I've posted a small image that best explains the problem
that I'm seeing:
http://www.hogbaysoftware.com/badgediconbug.gif
The left icon has a small white glitch in the bottom left corner. The
right icon is drawn as I want and expect. I'm trying to figure out what
is causng the glitch. It seems to show up randomly. Maybe 1 out of 10
times I'll get the glitch version, the rest of the time I get the
normal version.
I'm creating these icons by loading an image file. And then drawing 25%
black over the icon. My code looks like this:
NSImage *fileIcon = [NSImage imageNamed:@"file"];
NSImage *darkenedFileIcon = nil;
NSSize size = [baseImage size];
NSRect imageRect = {NSZeroPoint, size};
darkenedFileIcon = [[fileIcon copy] autorelease];
[darkenedFileIcon lockFocus];
[[[NSColor blackColor] colorWithAlphaComponent:0.25] set];
NSRectFillUsingOperation(imageRect, NSCompositeSourceAtop);
[darkenedFileIcon unlockFocus];
return darkenedFileIcon;
Behind the scenes I'm also caching these icons in a dictionary so I
only need to create a darkened version of each icon once. The catching
code looks like this. I'm not showing all the code, but I'm pretty sure
that retains counts are proper, I'm not experiencing any crashes in any
of these cases.
NSValue *lookupKey = [NSValue valueWithPointer:originalImage];
[darkenedImageCache setObject:lookupKey forKey:darkenedImage];
Has anyone seen this sort of problem before, or know what might be
causing it? Do you have suggestions on where I should look to fix the
problem?
Thanks,
Jesse
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