[cairo-bugs] [Bug 48395] New: Slow bitmap font rendering with cairo-1.12.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=48395

             Bug #: 48395
           Summary: Slow bitmap font rendering with cairo-1.12.0
    Classification: Unclassified
           Product: cairo
           Version: 1.12.0
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: cworth at cworth.org
        ReportedBy: freetheebee at gmail.com
         QAContact: cairo-bugs at cairographics.org


Bitmap font rendering in gtk applications is slow with Cairo 1.12.0-1 and 2.
For example gvim and Dina (font) leads to slow build-up of the screen compared
to qvim (qt) or gvim with a ttf font. The same problem also occurs for
xfce-terminal, but not in urxvt. In htop it shows that xorg goes to high cpu
load when making changes on the screen. With cairo-xcb 1.10.2 from AUR (arch
user repositories) this problem does not occur. 

Steps to reproduce:
Opening gvim with a bitmap font like Dina, shows a slow buildup of the screen.
Also making changes like toggling NERDtree or adding or removing menu toolbars
are slow. It is also visible when switching to a desktop with gvim open. The
problem is more obvious when the app window is larger.

Perhaps the general section is not the right place, but I did not know which
backend this might be related to.

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