Not quite. AppKit throttle view refresh to 60fps but it certainly won't throttle code that changes the gfx more often than that, i.e. something like this
for(;;) view.layer.contents = (id) getNextFrame(); will hog the CPU. So I need some external timing mechanism to set layer.contents not more often than necessary. I need to see if CADisplayLink can do that... On 16.10.2020 at 00:48 Graham Cox wrote: > Appkit already throttles view refreshes to 60fps. There’s nothing you need to > do. > —Graham >> On 16 Oct 2020, at 6:13 am, Andreas Falkenhahn via Cocoa-dev >> <cocoa-dev@lists.apple.com> wrote: >> I'm drawing inside an NSView by simply setting its layer's contents to a >> CGImage which is updated for every frame, e.g. something like this: >> dp = CGDataProviderCreateWithData(NULL, frameBuf, frameBufSize, NULL); >> im = CGImageCreate(frameWidth, frameHeight, 8, 32, frameStride, >> theColorSpace, (CGBitmapInfo) kCGImageAlphaNoneSkipFirst, dp, NULL, FALSE, >> kCGRenderingIntentDefault); >> view.layer.contents = (id) im; >> CGImageRelease(im); >> CGDataProviderRelease(dp); >> This works fine except that there is no throttle so this will draw as fast >> as the CPU allows, which of course is a waste of CPU cycles because the >> monitor only refreshes a certain amount of times per second. >> So is there a convenient way to throttle drawing to the monitor's refresh >> rate or does this have to be done the hard way by querying the monitor's >> refresh rate and then setting up a timer which draws in exactly those >> refresh intervals or how should this be done? >> Note that I'd like to avoid using OpenGL or Metal or whatever is the >> standard nowadays but I'm mainly interested in an AppKit solution... >> -- >> Best regards, >> Andreas Falkenhahn mailto:andr...@falkenhahn.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/graham.cox%40bigpond.com >> This email sent to graham....@bigpond.com -- Best regards, Andreas Falkenhahn mailto:andr...@falkenhahn.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