[texworks] zoom devours memory

Arno Trautmann Arno.Trautmann at gmx.de
Mon Sep 19 16:02:19 CEST 2011

Stefan Löffler wrote:
> Hi,
> On 2011-09-19 14:53, Arno Trautmann wrote:
>> I have some trouble with the built-in pdf viewer: When I zoom, it
>> works, great. But the largest and second-to-largest zoom steps take a
>> very long time to proceed (~ 30s on a document that has just “\TeX” in
>> it). Also, the memory consumption during this time (rendering time?)
>> goes up dramatically, up to 50% of my 1GB RAM. But when it's finished,
>> memory drops, the machine goes on working and scrolling etc. is very
>> fast again, also the zoom lense doesn't make any problems.
>> So – is this known? Is it a bug or just the way the renderer works?
>> Can it be improved?
> Yes, it is a known problem
> (http://code.google.com/p/texworks/issues/detail?id=86). It is just the
> way the poppler library (which does the page rendering) works - 30s are
> quite normal for high magnifications. The actual content indeed seems
> irrelevant. It might be that (part of) the problem lies in the internal
> handling of images by Qt, as even copying a large image from one
> variable to another takes noticeably long (maybe a second or two).

aaaww ☹

> The principle problem that it takes a long time can't be solved by us.
> But Charlie and I are currently working on an overhaul of the pdf
> previewer, which among other things should increase the response time of
> the application (by rendering in the background and displaying a scaled
> image until that is finished).

yeah ☺
Sounds good, thank you for your answer (and everything else, of course)


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