Implement Xinerama support (not used yet)

1 files changed, 86 insertions, 0 deletions

diff --git a/xinerama.c b/xinerama.c
new file mode 100644
index 0000000..91be487
--- /dev/null
+++ b/xinerama.c
@@ -0,0 +1,86 @@
+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * © 2010-2012 Michael Stapelberg
+ *
+ * See LICENSE for licensing information
+ *
+ */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <xcb/xcb.h>
+#include <xcb/xinerama.h>
+
+#include "xcb.h"
+#include "xinerama.h"
+
+/* Number of Xinerama screens which are currently present. */
+int xr_screens = 0;
+
+/* The resolutions of the currently present Xinerama screens. */
+Rect *xr_resolutions;
+
+static bool xinerama_active;
+
+void xinerama_init() {
+    if (!xcb_get_extension_data(conn, &xcb_xinerama_id)->present) {
+        printf("Xinerama extension not found, disabling.\n");
+        return;
+    }
+
+    xcb_xinerama_is_active_cookie_t cookie;
+    xcb_xinerama_is_active_reply_t *reply;
+
+    cookie = xcb_xinerama_is_active(conn);
+    reply = xcb_xinerama_is_active_reply(conn, cookie, NULL);
+    if (!reply)
+        return;
+
+    if (!reply->state) {
+        free(reply);
+        return;
+    }
+
+    xinerama_active = true;
+}
+
+void xinerama_query_screens() {
+    if (!xinerama_active)
+        return;
+
+    xcb_xinerama_query_screens_cookie_t cookie;
+    xcb_xinerama_query_screens_reply_t *reply;
+    xcb_xinerama_screen_info_t *screen_info;
+
+    cookie = xcb_xinerama_query_screens_unchecked(conn);
+    reply = xcb_xinerama_query_screens_reply(conn, cookie, NULL);
+    if (!reply) {
+        fprintf(stderr, "Couldn't get Xinerama screens\n");
+        return;
+    }
+    screen_info = xcb_xinerama_query_screens_screen_info(reply);
+    int screens = xcb_xinerama_query_screens_screen_info_length(reply);
+
+    Rect *resolutions = malloc(screens * sizeof(Rect));
+    /* No memory? Just keep on using the old information. */
+    if (!resolutions) {
+        free(reply);
+        return;
+    }
+    xr_resolutions = resolutions;
+    xr_screens = screens;
+
+    for (int screen = 0; screen < xr_screens; screen++) {
+        xr_resolutions[screen].x = screen_info[screen].x_org;
+        xr_resolutions[screen].y = screen_info[screen].y_org;
+        xr_resolutions[screen].width = screen_info[screen].width;
+        xr_resolutions[screen].height = screen_info[screen].height;
+        printf("found Xinerama screen: %d x %d at %d x %d\n",
+                        screen_info[screen].width, screen_info[screen].height,
+                        screen_info[screen].x_org, screen_info[screen].y_org);
+    }
+
+    free(reply);
+}