Actually, I bet you called lockFocus on the NSImage in between.
lockFocus is a mutation - you're replacing the original contents of the image with new drawing. lockFocus will _replace_ your original higher quality art with new drawing. See the same talk for more detail. On Mon, Nov 11, 2013 at 1:19 PM, Ken Ferry <kenfe...@gmail.com> wrote: > Hi Mathew, > If you can repro that in a test app, please file it. > The cache is used or tossed at _draw_ time, and it's based on whether the > number of pixels in the area to be covered matches the number of pixels in > the cache. > The -size of the NSImage has only an indirect effect on anything, in that > something might choose to draw the NSImage into a larger area based on that > size. The -size is really just metadata regarding how much space the image > might "prefer" to be drawn into. > FYI - generally, an NSImage should be thought of as immutable after it's > been (say) added to an NSImageView. It's not thread safe to change the size > of an NSImage while something else is using it on another thread, and you > have no idea if something else is using it on another thread once you've > vended it out to your app at large. The alternative is to copy the image > and change the size of the copy. This is cheap - the pixels are not copied, > just the shell NSImage structure. > For more info, please see a talk I gave, < > https://deimos.apple.com/WebObjects/Core.woa/BrowsePrivately/adc.apple.com.2233538716.02233538722.2238039498?i=1820509221 >>. > -ken > On Fri, Nov 8, 2013 at 8:48 AM, Graham Cox <graham....@bigpond.com> wrote: >> Hi Mathew, >> >> I think you need to set it to NSImageCacheNever. This turns off all of the >> internal caching mechanism, so your rep, if it’s the only rep in the image, >> will always be the one to draw. It’ll only be as pixellated as your >> implementation allows, which should be not at all, right? >> >> —Graham >> >> >> On 8 Nov 2013, at 4:46 pm, Mathew Eis <mat...@eisbox.net> wrote: >> >> > Hi Graham, >> > >> > Thanks for the reply… That’s more or less the crux of the issue; I can’t >> figure out how to make the rep "resolution independent”. >> > >> > If I draw it once at, say, 100x100, then I draw it again at 200x200, the >> second will be pixellated because the NSImage is using a cached (bitmap?) >> copy of it… If I drew it the first time at 200x200, the cached version >> has the correct resolution - but it isn’t truly resolution independent >> because it still seems to be caching a bitmap somewhere. >> > >> > Regards, >> > >> > -Mathew Eis >> >> >> _______________________________________________ >> >> 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: >> https://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com >> >> This email sent to kenfe...@gmail.com >> _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
