Re: Concurrent loading of images ?
Re: Concurrent loading of images ?
- Subject: Re: Concurrent loading of images ?
- From: Rob Petrovec via Cocoa-dev <email@hidden>
- Date: Fri, 8 May 2020 13:12:41 -0600
> On May 8, 2020, at 12:19 PM, Jens Alfke via Cocoa-dev
> <email@hidden> wrote:
>
>
>
>> On May 8, 2020, at 9:53 AM, Gabriel Zachmann via Cocoa-dev
>> <email@hidden> wrote:
>>
>> So, I was thinking, maybe it helps to load the next image concurrently,
>> while the current one is still being displayed.
>
> Sure. Just be aware that if you're using NSImage, simply loading an NSImage
> does not rasterize it; the class tries to be 'lazy' about doing work. So your
> background task should explicitly render it, e.g. into an NSBitmapImageRep.
>
>> I also read about the GCD's dispatch queues, but it seems to me that this
>> would not be the suitable approach since I always only have one task running
>> concurrently to the main thread.
>
> Why not? Dispatch queues are always available. (The main thread is simply a
> special queue.) You can run the background task by creating a single dispatch
> queue and then using dispatch_async to call a block that does the work. The
> end of the block would call dispatch_async back to the main queue and pass
> the image as a parameter.
I second the use of GCD. Its also considerably simpler than NSThread,
NSOperationQueue/NSOperation et al. This is the kind of operation that GCD was
invented for.
—Rob
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