https://bugs.kde.org/show_bug.cgi?id=423360
--- Comment #8 from maximumsomething <maximumsometh...@gmail.com> --- I did some investigating and the problem seems to be that TileManager::setPixmap is being called with a partially rendered (mostly white) pixmap covering the whole screen. Seemingly, whenever a new tile scrolls into view, the entire visible area is re-rendered. While this is happening, Poppler sends several updates with only parts of the PDF processed. The first of these updates is mostly white, and because it covers the whole screen, including tiles that were previously fully rendered, we see flashing. It's easiest to see this happen with a complex PDF that will serve a lot of partial updates. Possible solutions: - Restrict the updated area to only the part of the screen that was not rendered previously. (Possibly the job of DocumentPrivate::sendGeneratorPixmapRequest or Document::requestPixmaps.) - Disable partial renderings. - Never overwrite with a partial render tiles that were previously fully rendered. The first option seems to be the best, but I suspect that there's a reason it was originally written this way. -- You are receiving this mail because: You are watching all bug changes.
