Am 20.01.2013 10:46, schrieb Adam Reichold:
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Hello,
I was just testing this, trying to understand the exact implications
for usage of Poppler's qt4 frontend. From looking at it, I can have as
many threads in Page::renderToImage as I like as long as I don't
change the render hints while doing so. (Leaving overprint aside for
the moment.)
This seems to work fine, but when I search the document parallel to
that (even using different page objects and only one thread in
Page::search), I am getting all sorts of error messages (but no
crashes) about the file being malformed. From Thomas' comment on the
bug report, I would infer this is a known limitation? Or should this work?
Yes, Adam, this is a known limitation at the moment. I know, that the
bug report with over 140 comments is bad to read, but somewhere in the
middle we decided to make in a first step only the page rendering thread
safe. As I left yesterday as a last comment to that bug, one of the next
steps will be to make the qt library completely thread safe. This is
hopefully just a small task, because most of tat I had done that
already, so we'll have it probably in the very next future.
So my current working assumption is: there can any number of rendering
threads, but all rendering has stop before something else is to be called.
Don't spend too much work waiting on all rendering threads finished.
I.e. in Page::search we hopefully just need to use the thread safe
version of PDFDoc::displayPage in Page::prepareTextSearch, i.e.
parentDoc->doc->displayPage( &td, index + 1, 72, 72, rotation, false,
true, false, null, null, null, null, true);
instead of
parentDoc->doc->displayPage( &td, index + 1, 72, 72, rotation, false,
true, false );
Cheers,
Thomas
Best regards, Adam.
Am 19.01.2013 17:53, schrieb Albert Astals Cid:
El Dissabte, 19 de gener de 2013, a les 08:44:34, Albert Astals Cid
va escriure:
New commits: commit 8eb489c355d734a72e140ce7e32470d048362499
Author: Thomas Freitag <[email protected]> Date: Sat Jan
19 17:43:08 2013 +0100
Make rendering thread-safe
Bug #50992
This is quite a big of a change, we did lots of testing to make
sure it did not break things, but more testing is more than
welcome.
Cheers, Albert _______________________________________________
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http://lists.freedesktop.org/mailman/listinfo/poppler
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