[okular] [Bug 492529] okular is very slow opening some PDFs

[William Bader]

https://bugs.kde.org/show_bug.cgi?id=492529

William Bader <williambader at hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
     Ever confirmed|0                           |1
         Resolution|NOT A BUG                   |---

--- Comment #11 from William Bader <williambader at hotmail.com> ---
While looking at another issue in poppler, I found the bug that caused the
slowness.

When a Splash is created without antialiasing, there is no aaBuf, so
Splash::shadedFill() fails and Gfx falls back to filling the axial, radial or
function shading as many small paths. This PDF contains 43 axial (type 2) and
144 radial (type 3) shadings. Those are exactly the ones that hit the fallback
path. With vector antialiasing off on master, the Splash has no aaBuf, so
Splash::shadedFill() fails. Gfx then paints each of the 187 shadings as many
small filled paths, and that takes the time. With antialiasing on, the shading
goes through shadedFill() and is nearly instant. That's why turning
antialiasing on in Okular made it about 50 times faster instead of a few times
slower.

See the merge request at
https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/2411

-- 
You are receiving this mail because:
You are the assignee for the bug.