C++ (Cpp) xcb_create_colormap_checked示例

示例#1

static gboolean
_eventd_nd_xcb_get_colormap(EventdNdBackendContext *self)
{
    xcb_depth_t *root_depth = NULL;
    xcb_visualtype_t *root_visual = NULL;

    xcb_depth_iterator_t depth_iter;
    for ( depth_iter = xcb_screen_allowed_depths_iterator(self->screen) ; depth_iter.rem ; xcb_depth_next(&depth_iter) )
    {
        xcb_depth_t *d = depth_iter.data;

        xcb_visualtype_iterator_t visual_iter;
        for ( visual_iter = xcb_depth_visuals_iterator(d) ; visual_iter.rem ; xcb_visualtype_next(&visual_iter) )
        {
            xcb_visualtype_t *v = visual_iter.data;

            if ( ( d->depth == 32 ) && ( v->_class >= XCB_VISUAL_CLASS_TRUE_COLOR ) )
            {
                self->depth = d;
                self->visual = v;
            }
            if ( self->screen->root_visual == v->visual_id )
            {
                root_depth = d;
                root_visual = v;
            }
        }
    }

    if ( self->visual != NULL )
    {
        xcb_void_cookie_t c;
        xcb_generic_error_t *e;
        self->map = xcb_generate_id(self->xcb_connection);
        c = xcb_create_colormap_checked(self->xcb_connection, XCB_COLORMAP_ALLOC_NONE, self->map, self->screen->root, self->visual->visual_id);
        e = xcb_request_check(self->xcb_connection, c);
        if ( e == NULL )
            return TRUE;

        xcb_free_colormap(self->xcb_connection, self->map);
        free(e);
    }

    self->depth = root_depth;
    self->visual = root_visual;
    self->map = self->screen->default_colormap;
    return FALSE;
}

示例#2

文件： x11-helper.c 项目： gvsurenderreddy/rofi

void x11_create_visual_and_colormap ( void )
{
    xcb_depth_iterator_t depth_iter;
    for ( depth_iter = xcb_screen_allowed_depths_iterator ( xcb->screen ); depth_iter.rem; xcb_depth_next ( &depth_iter ) ) {
        xcb_depth_t               *d = depth_iter.data;

        xcb_visualtype_iterator_t visual_iter;
        for ( visual_iter = xcb_depth_visuals_iterator ( d ); visual_iter.rem; xcb_visualtype_next ( &visual_iter ) ) {
            xcb_visualtype_t *v = visual_iter.data;
            if ( ( d->depth == 32 ) && ( v->_class == XCB_VISUAL_CLASS_TRUE_COLOR ) ) {
                depth  = d;
                visual = v;
            }
            if ( xcb->screen->root_visual == v->visual_id ) {
                root_depth  = d;
                root_visual = v;
            }
        }
    }
    if ( visual != NULL ) {
        xcb_void_cookie_t   c;
        xcb_generic_error_t *e;
        map = xcb_generate_id ( xcb->connection );
        c   = xcb_create_colormap_checked ( xcb->connection, XCB_COLORMAP_ALLOC_NONE, map, xcb->screen->root, visual->visual_id );
        e   = xcb_request_check ( xcb->connection, c );
        if ( e ) {
            depth  = NULL;
            visual = NULL;
            free ( e );
        }
    }

    if ( visual == NULL ) {
        depth  = root_depth;
        visual = root_visual;
        map    = xcb->screen->default_colormap;
    }
}