id summary reporter owner description type status priority milestone component resolution keywords cc 286 question about 8bit pseudocolor support by xpra Ward Braspenning "Hello, I need 8 bit pseudocolor for some x apps who use it (don't have code of these apps to change it) to get blinking colors. But I don't get xpra working with depth = 8 bit. When I (on a Red Hat 7.2) test 'xpra start' ({{{v0.16.2-r11889}}}) as root with {{{DefaultDepth}}} and Depth 8 in {{{/root/.xpra/xorg.conf.d/Screen}}}, I get following error in file {{{':0.log'}}}: {{{ File ""window_bindings.pyx"", line 604, in xpra.x11.bindings.window_bindings.X11WindowBindings.ensure_XComposite_support (xpra/x11/bindings/window_bindings.c:5406): ... File ""window_bindings.pyx"", line 426, in xpra.x11.bindings.window_bindings.X11WindowBindings.ensure_extension_support (xpra/x11/bindings/window_bindings.c:2342) ValueError: X11 extension Composite not available ... }}} See attachments for the necessary files. I'm pretty sure it is a restriction in the x(dummy) server: From source code package xorg-x11-server-Xorg, v 1.17.2, file {{{composite/compext.c}}}, fu {{{CompositeExtensionInit}}}: {{{ ... //Composite on 8bpp pseudocolor root windows appears to fail, so //just disable it on anything pseudocolor for safety. for (vis = pScreen->visuals; vis->vid != pScreen->rootVisual; vis++); if ((vis->class | DynamicClass) == PseudoColor) return; ... }}} Xvnc, on the other hand, does support 8-bit pseudocolor. My questions are: - Is there a way to get 8 bit pseudocolor working with xpra that i overlook? - And do have the 'xpra'-developers an idea of what is necessary to get the 'composite' extension working with 8 bit pseudocolor. Or better to ask this on the Xorg team? I don't know enough of it, but if Xvnc gets 8 bit pseudolor working, the I think it should also be possible to implement this for X + Composite extension. Xvnc must also use something Composite like, no? Thanks in advance if you have the time and effort to look into these questions." enhancement closed trivial Global invalid