Re: Linux-x86-64 and cairo crash

[Philippe Roussel]

Hi

Le lundi 12 septembre 2011 à 13:17 -0600, Eric Wasylishen a écrit :

[snip]

> Based on what Fred said, it looks like the design of
> XGCairoXImageSurface is flawed and won't work on 16-bit displays. (But
> did it work for you in the past?) 
> 
> One thing you could try is switch to XGCairoSurface. In
> CairoContext.m, just adjust the comments so you have:
> #    define _CAIRO_SURFACE_CLASSNAME XGCairoSurface
> 
> This will create a cairo xlib surface for the window buffer, instead
> of a cairo image surface. Interestingly enough it seems to work for me
> - I don't think it worked a few months ago.
> 
> as an aside, I would like to switch to XGCairoSurface by default at
> some point, rather than fixing XGCairoXImageSurface. It would have a
> number of benefits, like:
> - enables subpixel antialising for fonts
> - removes the need for using shared memory for the window buffer for
> good performance (from what I understand, cairo will automatically use
> shm to transfer bitmaps to the x server when needed).
> - it may allow hardware acceleration for some operations?

Thanks a lot for the tip Eric, after switching to XGCairoSurface GNUstep
applications are a lot faster (well, drawing is a lot faster) when used
on an a display exported through ssh ! So fast they are usable, like gtk
applications always have been for me.

Thanks again,
Philippe