x11: Partially convert to XCB.

This commit mostly converts the X11 handling to XCB. There are still
some uses of XLib to deal with the X11 session handling modules, however all
client-side code should now be free of XLib and thus this should fix Bug #799

Note that this removes the screen-based changes by Leszek Koltunski
in 65e80, however this will be restored in due course.

1 files changed, 34 insertions, 29 deletions

diff --git a/src/pulsecore/x11prop.c b/src/pulsecore/x11prop.c
index dc8ec294..cc5987a8 100644
--- a/src/pulsecore/x11prop.c
+++ b/src/pulsecore/x11prop.c
@@ -25,53 +25,58 @@
 
 #include <string.h>
 
-#include <X11/Xlib.h>
-#include <X11/Xatom.h>
-
 #include "x11prop.h"
 
-void pa_x11_set_prop(Display *d, const char *name, const char *data) {
-    Atom a = XInternAtom(d, name, False);
-    XChangeProperty(d, DefaultRootWindow(d), a, XA_STRING, 8, PropModeReplace, (const unsigned char*) data, (int) (strlen(data)+1));
+#include <xcb/xproto.h>
+#include <xcb/xcb_atom.h>
+
+#define PA_XCB_FORMAT 8
+
+void pa_x11_set_prop(xcb_connection_t *xcb, const char *name, const char *data) {
+    xcb_screen_t *screen;
+    xcb_atom_t a = xcb_atom_get(xcb, name);
+    screen = xcb_setup_roots_iterator(xcb_get_setup(xcb)).data;
+    xcb_change_property(xcb, XCB_PROP_MODE_REPLACE, screen->root, a, STRING, PA_XCB_FORMAT, (int) strlen(data), (const void*) data);
 }
 
-void pa_x11_del_prop(Display *d, const char *name) {
-    Atom a = XInternAtom(d, name, False);
-    XDeleteProperty(d, DefaultRootWindow(d), a);
+void pa_x11_del_prop(xcb_connection_t *xcb, const char *name) {
+    xcb_screen_t *screen;
+    xcb_atom_t a = xcb_atom_get(xcb, name);
+    screen = xcb_setup_roots_iterator(xcb_get_setup(xcb)).data;
+    xcb_delete_property(xcb, screen->root, a);
 }
 
-char* pa_x11_get_prop(Display *d, const char *name, char *p, size_t l) {
-    Atom actual_type;
-    int actual_format;
-    unsigned long nitems;
-    unsigned long nbytes_after;
-    unsigned char *prop = NULL;
+char* pa_x11_get_prop(xcb_connection_t *xcb, const char *name, char *p, size_t l) {
     char *ret = NULL;
-    int window_ret;
+    int len;
+    xcb_get_property_cookie_t req;
+    xcb_get_property_reply_t* prop = NULL;
+    xcb_screen_t *screen;
+    xcb_atom_t a = xcb_atom_get(xcb, name);
+    screen = xcb_setup_roots_iterator(xcb_get_setup(xcb)).data;
 
-    Atom a = XInternAtom(d, name, False);
+    req = xcb_get_property(xcb, 0, screen->root, a, STRING, 0, (uint32_t)(l-1));
+    prop = xcb_get_property_reply(xcb, req, NULL);
 
-    window_ret = XGetWindowProperty(d, DefaultRootWindow(d), a, 0, (long) ((l+2)/4), False, XA_STRING, &actual_type, &actual_format, &nitems, &nbytes_after, &prop);
+    if (!prop)
+        goto finish;
 
-    if (window_ret != Success || actual_type != XA_STRING) {
-        if (DefaultScreen(d) != 0) {
-            window_ret = XGetWindowProperty(d, RootWindow(d, 0), a, 0, (long) ((l+2)/4), False, XA_STRING, &actual_type, &actual_format, &nitems, &nbytes_after, &prop);
+    if (PA_XCB_FORMAT != prop->format)
+        goto finish;
 
-            if (window_ret != Success || actual_type != XA_STRING)
-                goto finish;
-        } else
-            goto finish;
-    }
+    len = xcb_get_property_value_length(prop);
+    if (len < 1 || len >= (int)l)
+        goto finish;
 
-    memcpy(p, prop, nitems);
-    p[nitems] = 0;
+    memcpy(p, xcb_get_property_value(prop), len);
+    p[len] = 0;
 
     ret = p;
 
 finish:
 
     if (prop)
-        XFree(prop);
+        free(prop);
 
     return ret;
 }