[PATCH 3/4] spice: get monitors physical dimension

[marcandre . lureau]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

Note that for consistency, we use the same logic as MonitorsConfig to
figure out the associated monitor. However, I can't find traces of the
discussion/patches about the "new spice-server" behaviour: it still uses
the multiple-configurations path in git master.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 include/ui/console.h |  4 ++++
 ui/spice-display.c   | 52 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/include/ui/console.h b/include/ui/console.h
index f35b4fc082..c334b92e70 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -133,6 +133,9 @@ typedef struct DisplaySurface {
 } DisplaySurface;
 
 typedef struct QemuUIInfo {
+    /* physical dimension */
+    uint16_t width_mm;
+    uint16_t height_mm;
     /* geometry */
     int       xoff;
     int       yoff;
@@ -278,6 +281,7 @@ void update_displaychangelistener(DisplayChangeListener 
*dcl,
 void unregister_displaychangelistener(DisplayChangeListener *dcl);
 
 bool dpy_ui_info_supported(QemuConsole *con);
+const QemuUIInfo *dpy_get_ui_info(const QemuConsole *con);
 int dpy_set_ui_info(QemuConsole *con, QemuUIInfo *info);
 
 void dpy_gfx_update(QemuConsole *con, int x, int y, int w, int h);
diff --git a/ui/spice-display.c b/ui/spice-display.c
index 625d9232b9..93d4e1c0a4 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -657,6 +657,53 @@ static void interface_set_client_capabilities(QXLInstance 
*sin,
     /* nothing to do */
 }
 
+#if SPICE_INTERFACE_QXL_MAJOR >= 3 && SPICE_INTERFACE_QXL_MINOR >= 4
+static int interface_client_monitors_mm(QXLInstance *sin, VDAgentMonitorsMM 
*mm)
+{
+    SimpleSpiceDisplay *ssd = container_of(sin, SimpleSpiceDisplay, qxl);
+    QemuUIInfo info;
+    int head;
+
+    if (!dpy_ui_info_supported(ssd->dcl.con)) {
+        return 0; /* == not supported by guest */
+    }
+
+    if (!mm) {
+        return 1;
+    }
+
+    info = *dpy_get_ui_info(ssd->dcl.con);
+    /* Note: this code doesn't handle Spice multi-head support, where multiple
+     * monitor configuration for a single QXL device means multiple head. */
+    if (mm->num_of_monitors == 1) {
+        /*
+         * New spice-server version which filters the list of monitors
+         * to only include those that belong to our display channel.
+         *
+         * single-head configuration (where filtering doesn't matter)
+         * takes this code path too.
+         */
+        info.width_mm  = mm->monitors[0].width;
+        info.height_mm = mm->monitors[0].height;
+    } else {
+        /*
+         * Old spice-server which gives us all monitors, so we have to
+         * figure ourself which entry we need.  Array index is the
+         * channel_id, which is the qemu console index, see
+         * qemu_spice_add_display_interface().
+         */
+        head = qemu_console_get_index(ssd->dcl.con);
+        if (mm->num_of_monitors > head) {
+            info.width_mm  = mm->monitors[head].width;
+            info.height_mm = mm->monitors[head].height;
+        }
+    }
+
+    dpy_set_ui_info(ssd->dcl.con, &info);
+    return 1;
+}
+#endif
+
 static int interface_client_monitors_config(QXLInstance *sin,
                                             VDAgentMonitorsConfig *mc)
 {
@@ -674,6 +721,8 @@ static int interface_client_monitors_config(QXLInstance 
*sin,
 
     info = *dpy_get_ui_info(ssd->dcl.con);
 
+    /* Note: this code doesn't handle Spice multi-head support, where multiple
+     * monitor configuration for a single QXL device means multiple head. */
     if (mc->num_of_monitors == 1) {
         /*
          * New spice-server version which filters the list of monitors
@@ -728,6 +777,9 @@ static const QXLInterface dpy_interface = {
     .update_area_complete    = interface_update_area_complete,
     .set_client_capabilities = interface_set_client_capabilities,
     .client_monitors_config  = interface_client_monitors_config,
+#if SPICE_INTERFACE_QXL_MAJOR >= 3 && SPICE_INTERFACE_QXL_MINOR >= 4
+    .client_monitors_mm      = interface_client_monitors_mm,
+#endif
 };
 
 static void display_update(DisplayChangeListener *dcl,
-- 
2.26.2