I guess I should have asked "Is QuickLook implemented upon CGImageSource/CGImage or lower-level libraries under the hood?" I mean, the question is not I CGImageSource vs. CGImage, but rather CGImageSource/CGImage vs. lower-level libraries like libjpeg etc.
I tried to measure the performance of QuickLook vs CGImageSource but it's hard to make a clean experiment. I keep getting different figures each time. At superficial glance, it seems that they show nearly equal performance. But it would be really curious what libraries QuickLook uses under the hood. Thanks! On Fri, Sep 7, 2012 at 2:09 PM, Mike Abdullah <cocoa...@mikeabdullah.net> wrote: > Your question in the subject makes little sense. CGImageSource is a means to > create CGImages. Quick Look likely uses both therefore. > > Ultimately, you need to test different image loading routes to see which > suits your needs. > > CGImageSourceCreateImageAtIndex > Generates full-size images as fast as it can > > QLThumbnailImageCreate > Generates thumbnails > Might have the thumbnail already cached for speed > Is going to spend a little time in cross-process communication > Logs warnings if used on the main thread in my experience > Can handle any file type, not just images > > CGImageSourceCreateThumbnailAtIndex > Generates thumbnails > Very fast > > On 7 Sep 2012, at 10:21, Oleg Krupnov <oleg.krup...@gmail.com> wrote: > > And what is the fastest method for image loading, > QLThumbnailImageCreate or CGImageSourceCreateImageAtIndex? > > Thanks! > _______________________________________________ > > 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/cocoadev%40mikeabdullah.net > > This email sent to cocoa...@mikeabdullah.net > > _______________________________________________ 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
