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AW: Re: Free images based on allocated memory

From: Andreas Politz
Subject: AW: Re: Free images based on allocated memory
Date: Thu, 31 Jan 2019 18:33:28 +0100

Yes, I know about image eviction delay.  Also, I'm not really sure if what I was proposing is a good idea.

One goal in my package is it to display PDF pages quickly. 
There are 2 factors delaying this:  The actual rendering in the back-end (via poppler) and the loading of the image by Emacs.  

In order to limit this timespan, pages are speculative pre-rendered and pre-loaded. E.g. if page n is currently displayed, the user probably wants to view page n+1 next. This is implemented by filling  a LRU cache while Emacs is idle.

Note how this conflicts with a least-recently-displayed eviction strategy.

Of course this can be solved in Lisp, just not very elegantly.  I spare you the details.

Another extension point, which would help managing the image-cache in my case, would be the ability to flush images based on their data.  Note, this is currenly only supported for file based images.

Thanks for taking the time,

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