[cairo-bugs] [Bug 31603] New: Performance regression when drawing a CAIRO_FORMAT_RGB24 onto a xlib surface with 16bit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=31603

           Summary: Performance regression when drawing a
                    CAIRO_FORMAT_RGB24 onto a xlib surface with 16bit
           Product: cairo
           Version: 1.10.1
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: xlib backend
        AssignedTo: cworth at cworth.org
        ReportedBy: holger+fdo at moiji-mobile.com
         QAContact: cairo-bugs at cairographics.org


Cairo 1.10 started to go through a very slow path when it is asked to paint a
CAIRO_FORMAT_RGB24 surface onto the xlib surface provided by GDK/GTK. When the
device is having a target depth of 16bit per pixel cairo will go through the
slow _draw_image_surface routine.

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