Re: Set contents of CALayer to animated GIF?
Re: Set contents of CALayer to animated GIF?
- Subject: Re: Set contents of CALayer to animated GIF?
- From: David Duncan <email@hidden>
- Date: Tue, 10 Jun 2014 10:37:34 -0700
On Jun 10, 2014, at 8:05 AM, Charles Carver <email@hidden> wrote:
> Is it possible to set the contents of a CALayer to an animated GIF and have it display that animation?
No.
> I know that I can set the contents to an image like so:
>
> CALayer* subLayer = [CALayer layer];
> NSImage *image = [[NSImage alloc] initWithData:data];
> subLayer.contents = image;
>
> And the image will show, but if it's animated, the animation will not display. Is the only solution to get the individual frames for the GIF, get the frame rate, then change the content of the sublayer according to the frame rate?
Using strictly CALayers, pretty much.
> Or is there a much simpler method that I'm overlooking?
>
> Another idea I had was to have a blank NSImageView, then display it/fill it with the GIF data if the active sublayer included an animated GIF. This kind of worked, except only if the top-most NSView wasn’t using core animation. If it was using core animation, the GIF would only play if the window was >= the size of the GIF. If it was smaller, the GIF would simply stop playing (I even reproduced this in its own test project, same behavior). But then turning off core animation on the top view and having it enabled on the lower ones caused a series of unideal behavior (lag, glitches, flickering), as I don’t think a view hierarchy is supposed to be setup like that.
>
> Also, my reason for using core animation in the first place is because I'm loading a fair number of images at once and then individually showing one at a time. I started with just using an NSImageView, but the performance was awful compared to core animation.
>
> Anyways, any other ideas?
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David Duncan
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