Re: [ruby-gnome2-devel-en] Crashes when cairo is compiled with xlib-xcb xcb options

[Stefan S. <ma...@ss...>]

On Mon, 2016-01-04 at 21:38 +0900, Kouhei Sutou wrote:
> It seems that your cairo XCB surface is destroyed twice.

Have tried to debug it with gdb, but without real success.

Yesterday I tried to comment out parts of my code. My current feeling is
that

I have in pet-canvas.rb

@darea.signal_connect('configure-event') { darea_configure_callback }

darea_configure_callback() calls function paint(), where I have

cr0 = @darea.window.create_cairo_context

If I comment out that line, the bug is gone. But I need that to create a
similar surface for my background pattern!

I have no idea why that may generate the crash, why only with xcb, and
why not when I have moved some elements on my schematic sheet.

I will see if I can replace this call. For the draw event it is easy to
replace, I get the cairo context as a parameter for the called block. I
really should replace that. But for configure-event that is not that
easy. My intent was to create a similar surface for maximum performance,
and I think for that I need a cairo context. But a plain image surface
may work for testing.