[cairo-bugs] [Bug 10208] New: Cairo image rendering very slow on devices with depth 16 (and without hardware XrenderComposite)....

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=10208

           Summary: Cairo image rendering very slow on devices with depth 16
                    (and without hardware XrenderComposite)....
           Product: cairo
           Version: 1.4.0
          Platform: Other
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: xlib backend
        AssignedTo: cworth at cworth.org
        ReportedBy: romaxa at gmail.com
         QAContact: cairo-bugs at cairographics.org


Environment:
ARM, N800, Hard Float Point.
Xlib backend, 16 depth color.

Cairo have very big problems with image rendering on devices without Hardware
Composite and only with TrueColor support.

When I'm trying to render some images with alpha channel (32 bit), on 16 bit
surface, and scrolling them, cairo doing ImageComposite for each 1pix/scroll
step.

For each composite operation, cairo doing conversation from 32->16, don't do
results caching.


Probably this problem can be fixed by supporting 16 depth (see Bug 4945)...


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