On May 14, 2020, at 11:13 AM, Gabriel Zachmann via Cocoa-dev
<cocoa-dev@lists.apple.com> wrote:
>
> I thought i'm doing that with this code:
>
> -animateOneframe:
> // essentially, this gets called when the next image is to be displayed
> current_image_ = prefetched_image_; // these are CGImageRef's
> dispatch_async( prefetch_queue_, ^{
> [self loadNextImage]; // stores next image in
> prefetched_image_
> } );
> create a new CALayer,
> assign the current_image_ as content,
> create an animation for the layer,
> add the layer to the layer hierarchy
Since this stutter does not occur when cycling back through images that have
already been assigned to the layer, it’s possible that if the size of the
CGImageRef does not match the size of the CALayer, there may be some kind of
render occuring, especially if the image is being scaled to fit the layer. Do
images much larger than the CALayer stutter more?
Also, if you’re resizing, you’ll want to use CIImage’s CILanczosScaleTransform
filter. Simply scaling a using a transform will give you a much blurrier image.
Jim Crate
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