[cairo] cairo-with-xlib-xrender rendering is not proper

prudhvi raj prudhviraj.v at gmail.com
Tue Feb 2 00:07:46 PST 2010

Can any one please provides some inputs regarding the issue mentioned in
above post.
Its really critical for us and any suggestions will be highly appreciated.

On Sat, Jan 30, 2010 at 2:33 PM, prudhvi raj <prudhviraj.v at gmail.com> wrote:

> Hello,
> I am trying to port gtk-x11 on to an ARM platform and check the rendering
> performance of gtk on tinyx. For that i compiled cairo-x11 with xlib-xrender
> enabled. But when i run any application that uses cairo the fonts are not
> rendered properly and some black boxes are overlapping the some characters
> of the string and some extra lines are coming behind some characters (as
> shown in the attached screenshot of gtkperf application that uses cairo with
> xlib-xreneder option enabled). But if i compile cairo by disabling
> xlib-xreneder the display is good and fonts are displayed properly, but the
> time taken for rendering is increasing two times. I think as xrender takes
> advantage of acceleration available in tinyx/x11 it is speeding up the
> rendering. But i didnt make any changes in either xrender code or cairo
> code.
>     Can anyone identify the reason for this improper display if we enable
> xlib-xrender option in cairo. Is it a bug in cairo/xrender implementation or
> we are missing some thing else in the configuration?? The configuration
> settings we are using is mentioned below.
> we are using cairo-1.8.0, gtk+-2.12.3, pango-1.22.1, fontconfig-2.6.0,
> freetype-2.3.7, pixman-0.12.0 and tinyx server xorg-server-1.5.1 (R7.4
> release) and arm-v7 toolchain used for cross compilation.
> cairo configuration settings:
> ./configure --enable-xlib --enable-xlib-xrender --disable-pdf --disable-ps
> --disable-svg --enable-png=yes --with-x --disable-some-floating-point
> *please find the attached screen-shots which could explain the above
> mentioned rendering problem.*
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