1 files changed, 703 insertions, 0 deletions
diff --git a/mate-panel/panel-multimonitor.c b/mate-panel/panel-multimonitor.c
new file mode 100644
index 00000000..c370838b
--- /dev/null
+++ b/mate-panel/panel-multimonitor.c
@@ -0,0 +1,703 @@
+/*
+ * panel-multimonitor.c: Multi-monitor and Xinerama support for the panel.
+ *
+ * Copyright (C) 2001 George Lebl <[email protected]>
+ * 2002 Sun Microsystems Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+ * USA
+ *
+ * Authors: George Lebl <[email protected]>,
+ * Mark McLoughlin <[email protected]>
+ */
+
+#include <config.h>
+
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xrandr.h>
+#include <gdk/gdkx.h>
+
+#include "panel-multiscreen.h"
+
+#include <string.h>
+
+static int screens = 0;
+static int *monitors = NULL;
+static GdkRectangle **geometries = NULL;
+static gboolean initialized = FALSE;
+static gboolean have_randr = FALSE;
+static guint reinit_id = 0;
+
+#ifdef HAVE_RANDR
+static gboolean
+_panel_multiscreen_output_should_be_first (Display *xdisplay,
+ RROutput output,
+ XRROutputInfo *info,
+ RROutput primary)
+{
+ if (primary)
+ return output == primary;
+
+ Atom connector_type_atom;
+ Atom actual_type;
+ int actual_format;
+ unsigned long nitems;
+ unsigned long bytes_after;
+ unsigned char *prop;
+ char *connector_type;
+ gboolean retval;
+
+ connector_type_atom = XInternAtom (xdisplay, "ConnectorType", False);
+
+ if (XRRGetOutputProperty (xdisplay, output, connector_type_atom,
+ 0, 100, False, False, None,
+ &actual_type, &actual_format,
+ &nitems, &bytes_after, &prop) == Success) {
+ if (actual_type == XA_ATOM && nitems == 1 && actual_format == 32) {
+ connector_type = XGetAtomName (xdisplay, prop[0]);
+ retval = g_strcmp0 (connector_type, "Panel") == 0;
+ XFree (connector_type);
+ return retval;
+ }
+ }
+
+ /* Fallback (see https://bugs.freedesktop.org/show_bug.cgi?id=26736)
+ * "LVDS" is the oh-so-intuitive name that X gives to laptop LCDs.
+ * It can actually be LVDS0, LVDS-0, Lvds, etc.
+ */
+ return (g_ascii_strncasecmp (info->name, "LVDS", strlen ("LVDS")) == 0);
+}
+#endif
+
+static gboolean
+panel_multiscreen_get_randr_monitors_for_screen (GdkScreen *screen,
+ int *monitors_ret,
+ GdkRectangle **geometries_ret)
+{
+#ifdef HAVE_RANDR
+ GdkDisplay *display;
+ GdkMonitor *monitor;
+ Display *xdisplay;
+ Window xroot;
+ XRRScreenResources *resources;
+ RROutput primary;
+ GArray *geometries;
+ int scale;
+ int i;
+
+ if (!have_randr)
+ return FALSE;
+
+ /* GTK+ 2.14.x uses the Xinerama API, instead of RANDR, to get the
+ * monitor geometries. It does this to avoid calling
+ * XRRGetScreenResources(), which is slow as it re-detects all the
+ * monitors --- note that XRRGetScreenResourcesCurrent() had not been
+ * introduced yet. Using Xinerama in GTK+ has the bad side effect that
+ * gdk_screen_get_monitor_plug_name() will return NULL, as Xinerama
+ * does not provide that information, unlike RANDR.
+ *
+ * Here we need to identify the output names, so that we can put the
+ * built-in LCD in a laptop *before* all other outputs. This is so
+ * that mate-panel will normally prefer to appear on the "native"
+ * display rather than on an external monitor.
+ *
+ * To get the output names and geometries, we will not use
+ * gdk_screen_get_n_monitors() and friends, but rather we will call
+ * XRR*() directly.
+ *
+ * See https://bugzilla.novell.com/show_bug.cgi?id=479684 for this
+ * particular bug, and and
+ * http://bugzilla.gnome.org/show_bug.cgi?id=562944 for a more
+ * long-term solution.
+ */
+
+ xdisplay = GDK_SCREEN_XDISPLAY (screen);
+ xroot = GDK_WINDOW_XID (gdk_screen_get_root_window (screen));
+
+ resources = XRRGetScreenResourcesCurrent (xdisplay, xroot);
+ if (resources->noutput == 0) {
+ /* This might happen if nothing tried to get randr
+ * resources from the server before, so we need an
+ * active probe. See comment #27 in
+ * https://bugzilla.gnome.org/show_bug.cgi?id=597101 */
+ XRRFreeScreenResources (resources);
+ resources = XRRGetScreenResources (xdisplay, xroot);
+ }
+
+ if (!resources)
+ return FALSE;
+
+ primary = XRRGetOutputPrimary (xdisplay, xroot);
+ display = gdk_screen_get_display (screen);
+ monitor = gdk_display_get_primary_monitor (display);
+
+ /* Use scale factor to bring geometries down to device pixels to support HiDPI displays */
+ scale = gdk_monitor_get_scale_factor (monitor);
+
+ geometries = g_array_sized_new (FALSE, FALSE,
+ sizeof (GdkRectangle),
+ resources->noutput);
+
+ for (i = 0; i < resources->noutput; i++) {
+ XRROutputInfo *output;
+
+ output = XRRGetOutputInfo (xdisplay, resources,
+ resources->outputs[i]);
+
+ if (output->connection != RR_Disconnected &&
+ output->crtc != 0) {
+ XRRCrtcInfo *crtc;
+ GdkRectangle rect;
+
+ crtc = XRRGetCrtcInfo (xdisplay, resources,
+ output->crtc);
+
+ rect.x = crtc->x / scale;
+ rect.y = crtc->y / scale;
+ rect.width = crtc->width / scale;
+ rect.height = crtc->height / scale;
+
+ XRRFreeCrtcInfo (crtc);
+
+ if (_panel_multiscreen_output_should_be_first (xdisplay,
+ resources->outputs[i],
+ output, primary))
+ g_array_prepend_vals (geometries, &rect, 1);
+ else
+ g_array_append_vals (geometries, &rect, 1);
+ }
+
+ XRRFreeOutputInfo (output);
+ }
+
+ XRRFreeScreenResources (resources);
+
+ if (geometries->len == 0) {
+ /* This can happen in at least one case:
+ * https://bugzilla.novell.com/show_bug.cgi?id=543876 where all
+ * monitors appear disconnected (possibly because the screen
+ * is behing a KVM switch) -- see comment #8.
+ * There might be other cases too, so we stay on the safe side.
+ */
+ g_array_free (geometries, TRUE);
+ return FALSE;
+ }
+
+ *monitors_ret = geometries->len;
+ *geometries_ret = (GdkRectangle *) g_array_free (geometries, FALSE);
+
+ return TRUE;
+#else
+ return FALSE;
+#endif
+}
+
+static void
+panel_multiscreen_get_gdk_monitors_for_screen (GdkScreen *screen,
+ int *monitors_ret,
+ GdkRectangle **geometries_ret)
+{
+ GdkDisplay *display;
+ int num_monitors;
+ GdkRectangle *geometries;
+ int i;
+
+ display = gdk_screen_get_display (screen);
+ num_monitors = gdk_display_get_n_monitors (display);
+ geometries = g_new (GdkRectangle, num_monitors);
+
+ for (i = 0; i < num_monitors; i++)
+ gdk_monitor_get_geometry (gdk_display_get_monitor (display, i), &(geometries[i]));
+
+ *monitors_ret = num_monitors;
+ *geometries_ret = geometries;
+}
+
+static void
+panel_multiscreen_get_raw_monitors_for_screen (GdkScreen *screen,
+ int *monitors_ret,
+ GdkRectangle **geometries_ret)
+{
+ gboolean res;
+
+ *monitors_ret = 0;
+ *geometries_ret = NULL;
+
+ res = panel_multiscreen_get_randr_monitors_for_screen (screen,
+ monitors_ret,
+ geometries_ret);
+ if (res && *monitors_ret > 0)
+ return;
+
+ panel_multiscreen_get_gdk_monitors_for_screen (screen,
+ monitors_ret,
+ geometries_ret);
+}
+
+static inline gboolean
+rectangle_overlaps (GdkRectangle *a,
+ GdkRectangle *b)
+{
+ return gdk_rectangle_intersect (a, b, NULL);
+}
+
+static long
+pixels_in_rectangle (GdkRectangle *r)
+{
+ return (long) (r->width * r->height);
+}
+
+static void
+panel_multiscreen_compress_overlapping_monitors (int *num_monitors_inout,
+ GdkRectangle **geometries_inout)
+{
+ int num_monitors;
+ GdkRectangle *geometries;
+ int i;
+
+ num_monitors = *num_monitors_inout;
+ geometries = *geometries_inout;
+
+ /* http://bugzilla.gnome.org/show_bug.cgi?id=530969
+ * https://bugzilla.novell.com/show_bug.cgi?id=310208
+ * and many other such bugs...
+ *
+ * RANDR sometimes gives us monitors that overlap (i.e. outputs whose
+ * bounding rectangles overlap). This is sometimes right and sometimes
+ * wrong:
+ *
+ * * Right - two 1024x768 outputs at the same offset (0, 0) that show
+ * the same thing. Think "laptop plus projector with the same
+ * resolution".
+ *
+ * * Wrong - one 1280x1024 output ("laptop internal LCD") and another
+ * 1024x768 output ("external monitor"), both at offset (0, 0).
+ * There is no way for the monitor with the small resolution to
+ * show the complete image from the laptop's LCD, unless one uses
+ * panning (but nobody wants panning, right!?).
+ *
+ * With overlapping monitors, we may end up placing the panel with
+ * respect to the "wrong" one. This is always wrong, as the panel
+ * appears "in the middle of the screen" of the monitor with the
+ * smaller resolution, instead of at the edge.
+ *
+ * Our strategy is to find the subsets of overlapping monitors, and
+ * "compress" each such set to being like if there were a single
+ * monitor with the biggest resolution of each of that set's monitors.
+ * Say we have four monitors
+ *
+ * A, B, C, D
+ *
+ * where B and D overlap. In that case, we'll generate a new list that
+ * looks like
+ *
+ * A, MAX(B, D), C
+ *
+ * with three monitors.
+ *
+ * NOTE FOR THE FUTURE: We could avoid most of this mess if we had a
+ * concept of a "primary monitor". Also, we could look at each
+ * output's name or properties to see if it is the built-in LCD in a
+ * laptop. However, with GTK+ 2.14.x we don't get output names, since
+ * it gets the list outputs from Xinerama, not RANDR (and Xinerama
+ * doesn't provide output names).
+ */
+
+ for (i = 0; i < num_monitors; i++) {
+ long max_pixels;
+ int j;
+
+ max_pixels = pixels_in_rectangle (&geometries[i]);
+
+ j = i + 1;
+
+ while (j < num_monitors) {
+ if (rectangle_overlaps (&geometries[i],
+ &geometries[j])) {
+ long pixels;
+
+ pixels = pixels_in_rectangle (&geometries[j]);
+ if (pixels > max_pixels) {
+ max_pixels = pixels;
+ /* keep the maximum */
+ geometries[i] = geometries[j];
+ }
+
+ /* Shift the remaining monitors to the left */
+ if (num_monitors - j - 1 > 0)
+ memmove (&geometries[j],
+ &geometries[j + 1],
+ sizeof (geometries[0]) * (num_monitors - j - 1));
+
+ num_monitors--;
+ g_assert (num_monitors > 0);
+ } else
+ j++;
+ }
+ }
+
+ *num_monitors_inout = num_monitors;
+ *geometries_inout = geometries;
+}
+
+static void
+panel_multiscreen_get_monitors_for_screen (GdkScreen *screen,
+ int *monitors_ret,
+ GdkRectangle **geometries_ret)
+{
+ panel_multiscreen_get_raw_monitors_for_screen (screen,
+ monitors_ret,
+ geometries_ret);
+ panel_multiscreen_compress_overlapping_monitors (monitors_ret,
+ geometries_ret);
+}
+
+static gboolean
+panel_multiscreen_reinit_idle (gpointer data)
+{
+ panel_multiscreen_reinit ();
+ reinit_id = 0;
+
+ return FALSE;
+}
+
+static void
+panel_multiscreen_queue_reinit (void)
+{
+ if (reinit_id)
+ return;
+
+ reinit_id = g_idle_add (panel_multiscreen_reinit_idle, NULL);
+}
+
+static void
+panel_multiscreen_init_randr (GdkDisplay *display)
+{
+#ifdef HAVE_RANDR
+ Display *xdisplay;
+ int event_base, error_base;
+#endif
+
+ have_randr = FALSE;
+
+#ifdef HAVE_RANDR
+ xdisplay = GDK_DISPLAY_XDISPLAY (display);
+
+ /* We don't remember the event/error bases, as we expect to get "screen
+ * changed" events from GdkScreen instead.
+ */
+
+ if (XRRQueryExtension (xdisplay, &event_base, &error_base)) {
+ int major, minor;
+
+ XRRQueryVersion (xdisplay, &major, &minor);
+ if ((major == 1 && minor >= 3) || major > 1)
+ have_randr = TRUE;
+ }
+#endif
+}
+
+void
+panel_multiscreen_init (void)
+{
+ GdkDisplay *display;
+
+ if (initialized)
+ return;
+
+ display = gdk_display_get_default ();
+ screens = 1;
+
+ panel_multiscreen_init_randr (display);
+
+ monitors = g_new0 (int, screens);
+ geometries = g_new0 (GdkRectangle *, screens);
+
+ GdkScreen *screen;
+
+ screen = gdk_display_get_default_screen (display);
+
+ /* We connect to both signals to be on the safe side, but in
+ * theory, it should be enough to only connect to
+ * monitors-changed. Since we'll likely get two signals, we do
+ * the real callback in the idle loop. */
+ g_signal_connect (screen, "size-changed",
+ G_CALLBACK (panel_multiscreen_queue_reinit), NULL);
+ g_signal_connect (screen, "monitors-changed",
+ G_CALLBACK (panel_multiscreen_queue_reinit), NULL);
+
+ panel_multiscreen_get_monitors_for_screen (screen,
+ &(monitors[0]),
+ &(geometries[0]));
+
+ initialized = TRUE;
+}
+
+void
+panel_multiscreen_reinit (void)
+{
+ GdkScreen *screen;
+ GList *toplevels, *l;
+
+ if (monitors)
+ g_free (monitors);
+
+ if (geometries) {
+ int j;
+
+ for (j = 0; j < screens; j++)
+ g_free (geometries[j]);
+ g_free (geometries);
+ }
+
+ screen = gdk_screen_get_default ();
+ g_signal_handlers_disconnect_by_func (screen, panel_multiscreen_queue_reinit, NULL);
+
+ initialized = FALSE;
+ panel_multiscreen_init ();
+
+ toplevels = gtk_window_list_toplevels ();
+
+ for (l = toplevels; l; l = l->next)
+ gtk_widget_queue_resize (l->data);
+
+ g_list_free (toplevels);
+}
+
+int
+panel_multiscreen_screens (void)
+{
+ return screens;
+}
+
+int
+panel_multiscreen_monitors (GdkScreen *screen)
+{
+ int n_screen;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ g_return_val_if_fail (n_screen >= 0 && n_screen < screens, 1);
+
+ return monitors [n_screen];
+}
+
+int
+panel_multiscreen_x (GdkScreen *screen,
+ int monitor)
+{
+ int n_screen;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ g_return_val_if_fail (n_screen >= 0 && n_screen < screens, 0);
+ g_return_val_if_fail (monitor >= 0 && monitor < monitors [n_screen], 0);
+
+ return geometries [n_screen][monitor].x;
+}
+
+int
+panel_multiscreen_y (GdkScreen *screen,
+ int monitor)
+{
+ int n_screen;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ g_return_val_if_fail (n_screen >= 0 && n_screen < screens, 0);
+ g_return_val_if_fail (monitor >= 0 && monitor < monitors [n_screen], 0);
+
+ return geometries [n_screen][monitor].y;
+}
+
+int
+panel_multiscreen_width (GdkScreen *screen,
+ int monitor)
+{
+ int n_screen;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ g_return_val_if_fail (n_screen >= 0 && n_screen < screens, 0);
+ g_return_val_if_fail (monitor >= 0 && monitor < monitors [n_screen], 0);
+
+ return geometries [n_screen][monitor].width;
+}
+
+int
+panel_multiscreen_height (GdkScreen *screen,
+ int monitor)
+{
+ int n_screen;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ g_return_val_if_fail (n_screen >= 0 && n_screen < screens, 0);
+ g_return_val_if_fail (monitor >= 0 && monitor < monitors [n_screen], 0);
+
+ return geometries [n_screen][monitor].height;
+}
+
+int
+panel_multiscreen_locate_widget_monitor (GtkWidget *widget)
+{
+ GtkWidget *toplevel;
+ int retval = -1;
+
+ toplevel = gtk_widget_get_toplevel (widget);
+ if (!toplevel)
+ return -1;
+
+ g_object_get (toplevel, "monitor", &retval, NULL);
+
+ return retval;
+}
+
+static int
+axis_distance (int p, int axis_start, int axis_size)
+{
+ if (p >= axis_start && p < axis_start + axis_size)
+ return 0;
+ else if (p < axis_start)
+ return (axis_start - p);
+ else
+ return (p - (axis_start + axis_size - 1));
+}
+
+/* The panel can't use gdk_screen_get_monitor_at_point() since it has its own
+ * view of which monitors are present. Look at get_monitors_for_screen() above
+ * to see why. */
+int
+panel_multiscreen_get_monitor_at_point (GdkScreen *screen,
+ int x,
+ int y)
+{
+ int n_screen;
+ int i;
+ int n_monitors;
+ GdkRectangle *geoms;
+ int min_dist_squared;
+ int closest_monitor;
+
+ /* not -1 as callers expect a real monitor */
+ g_return_val_if_fail (GDK_IS_SCREEN (screen), 0);
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ n_monitors = monitors[n_screen];
+ geoms = geometries[n_screen];
+
+ min_dist_squared = G_MAXINT32;
+ closest_monitor = 0;
+
+ for (i = 0; i < n_monitors; i++) {
+ int dist_x, dist_y;
+ int dist_squared;
+
+ dist_x = axis_distance (x, geoms[i].x, geoms[i].width);
+ dist_y = axis_distance (y, geoms[i].y, geoms[i].height);
+
+ if (dist_x == 0 && dist_y == 0)
+ return i;
+
+ dist_squared = dist_x * dist_x + dist_y * dist_y;
+
+ if (dist_squared < min_dist_squared) {
+ min_dist_squared = dist_squared;
+ closest_monitor = i;
+ }
+ }
+
+ return closest_monitor;
+}
+
+typedef struct {
+ int x0;
+ int y0;
+ int x1;
+ int y1;
+} MonitorBounds;
+
+static inline void
+get_monitor_bounds (int n_screen,
+ int n_monitor,
+ MonitorBounds *bounds)
+{
+ g_assert (n_screen >= 0 && n_screen < screens);
+ g_assert (n_monitor >= 0 || n_monitor < monitors [n_screen]);
+ g_assert (bounds != NULL);
+
+ bounds->x0 = geometries [n_screen][n_monitor].x;
+ bounds->y0 = geometries [n_screen][n_monitor].y;
+ bounds->x1 = bounds->x0 + geometries [n_screen][n_monitor].width;
+ bounds->y1 = bounds->y0 + geometries [n_screen][n_monitor].height;
+}
+
+/* determines whether a given monitor is along the visible
+ * edge of the logical screen.
+ */
+void
+panel_multiscreen_is_at_visible_extreme (GdkScreen *screen,
+ int n_monitor,
+ gboolean *leftmost,
+ gboolean *rightmost,
+ gboolean *topmost,
+ gboolean *bottommost)
+{
+ MonitorBounds monitor;
+ int n_screen, i;
+
+ n_screen = gdk_x11_screen_get_screen_number (screen);
+
+ *leftmost = TRUE;
+ *rightmost = TRUE;
+ *topmost = TRUE;
+ *bottommost = TRUE;
+
+ g_return_if_fail (n_screen >= 0 && n_screen < screens);
+ g_return_if_fail (n_monitor >= 0 && n_monitor < monitors [n_screen]);
+
+ get_monitor_bounds (n_screen, n_monitor, &monitor);
+
+ /* go through each monitor and try to find one either right,
+ * below, above, or left of the specified monitor
+ */
+
+ for (i = 0; i < monitors [n_screen]; i++) {
+ MonitorBounds iter;
+
+ if (i == n_monitor) continue;
+
+ get_monitor_bounds (n_screen, i, &iter);
+
+ if ((iter.y0 >= monitor.y0 && iter.y0 < monitor.y1) ||
+ (iter.y1 > monitor.y0 && iter.y1 <= monitor.y1)) {
+ if (iter.x0 < monitor.x0)
+ *leftmost = FALSE;
+ if (iter.x1 > monitor.x1)
+ *rightmost = FALSE;
+ }
+
+ if ((iter.x0 >= monitor.x0 && iter.x0 < monitor.x1) ||
+ (iter.x1 > monitor.x0 && iter.x1 <= monitor.x1)) {
+ if (iter.y0 < monitor.y0)
+ *topmost = FALSE;
+ if (iter.y1 > monitor.y1)
+ *bottommost = FALSE;
+ }
+ }
+}
+