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Use an ARGB visual if one is available (FS#829) 

With this commit, awesome prefers ARGB visuals over the screen's default visual.
This means that all our (visible) windows now can get an alpha channel that a
compositing manager can use for producing transparent windows.

The reason why this is done is to fix a bug. We are reparenting clients into
other windows. If one of these client window uses an ARGB visual, its
transparency would have no effect.

Signed-off-by: Uli Schlachter <psychon@znc.in>
This commit is contained in:
Uli Schlachter 2010-09-30 14:31:37 +02:00
parent 8ea94154a6
commit 643ec85117
1 changed files with 43 additions and 3 deletions
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46
awesome.c
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@ -157,7 +157,7 @@ scan(void)
}
static xcb_visualtype_t *
screen_default_visual(xcb_screen_t *s)
a_default_visual(xcb_screen_t *s)
{
xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(s);
@ -171,6 +171,36 @@ screen_default_visual(xcb_screen_t *s)
return NULL;
}
static xcb_visualtype_t *
a_argb_visual(xcb_screen_t *s)
{
xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(s);
if(depth_iter.data)
for(; depth_iter.rem; xcb_depth_next (&depth_iter))
if(depth_iter.data->depth == 32)
for(xcb_visualtype_iterator_t visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
visual_iter.rem; xcb_visualtype_next (&visual_iter))
return visual_iter.data;
return NULL;
}
static uint8_t
a_visual_depth(xcb_screen_t *s, xcb_visualid_t vis)
{
xcb_depth_iterator_t depth_iter = xcb_screen_allowed_depths_iterator(s);
if(depth_iter.data)
for(; depth_iter.rem; xcb_depth_next (&depth_iter))
for(xcb_visualtype_iterator_t visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
visual_iter.rem; xcb_visualtype_next (&visual_iter))
if(vis == visual_iter.data->visual_id)
return depth_iter.data->depth;
fatal("Could not find a visual's depth");
}
static void
a_refresh_cb(EV_P_ ev_prepare *w, int revents)
{
@ -374,9 +404,19 @@ main(int argc, char **argv)
fatal("cannot open display");
globalconf.screen = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen);
globalconf.visual = screen_default_visual(globalconf.screen);
globalconf.default_depth = globalconf.screen->root_depth;
globalconf.visual = a_argb_visual(globalconf.screen);
if(!globalconf.visual)
globalconf.visual = a_default_visual(globalconf.screen);
globalconf.default_depth = a_visual_depth(globalconf.screen, globalconf.visual->visual_id);
globalconf.default_cmap = globalconf.screen->default_colormap;
if(globalconf.default_depth != globalconf.screen->root_depth)
{
// We need our own color map if we aren't using the default depth
globalconf.default_cmap = xcb_generate_id(globalconf.connection);
xcb_create_colormap(globalconf.connection, XCB_COLORMAP_ALLOC_NONE,
globalconf.default_cmap, globalconf.screen->root,
globalconf.visual->visual_id);
}
/* Prefetch all the extensions we might need */
xcb_prefetch_extension_data(globalconf.connection, &xcb_big_requests_id);