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xcb: Find the correct xcb_screen_t for faking Screen

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When choosing the xcb_screen_t to use for the xlib-xcb backing surface,
it helps if it matches the screen used to generate similar surfaces and
snapshots - otherwise we end up pulling the image back from the XServer
every time we want to use the Picture.
This commit is contained in:
Chris Wilson 2010-05-08 18:20:11 +01:00
parent 448d357108
commit 9d863cd394
1 changed files with 21 additions and 2 deletions
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23
src/cairo-xlib-xcb-surface.c
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@ -342,6 +342,21 @@ cairo_xlib_surface_create_for_bitmap (Display *dpy,
}
#if CAIRO_HAS_XLIB_XRENDER_SURFACE
static xcb_screen_t *
_cairo_xcb_screen_from_root (xcb_connection_t *connection,
xcb_window_t id)
{
xcb_depth_iterator_t d;
xcb_screen_iterator_t s;
s = xcb_setup_roots_iterator (xcb_get_setup (connection));
for (; s.rem; xcb_screen_next (&s)) {
if (s.data->root == id)
return s.data;
}
return NULL;
}
cairo_surface_t *
cairo_xlib_surface_create_with_xrender_format (Display *dpy,
Drawable drawable,
@ -351,6 +366,8 @@ cairo_xlib_surface_create_with_xrender_format (Display *dpy,
int height)
{
xcb_render_pictforminfo_t xcb_format;
xcb_connection_t *connection;
xcb_screen_t *screen;
xcb_format.id = format->id;
xcb_format.type = format->type;
@ -365,9 +382,11 @@ cairo_xlib_surface_create_with_xrender_format (Display *dpy,
xcb_format.direct.alpha_mask = format->direct.alphaMask;
xcb_format.colormap = format->colormap;
connection = XGetXCBConnection (dpy);
screen = _cairo_xcb_screen_from_root (connection, (xcb_window_t) scr->root);
return _cairo_xlib_xcb_surface_create (dpy, scr, NULL, format,
cairo_xcb_surface_create_with_xrender_format (XGetXCBConnection (dpy),
(xcb_screen_t *) scr,
cairo_xcb_surface_create_with_xrender_format (connection, screen,
drawable,
&xcb_format,
width, height));