[win-vd_agent PATCH] Check that client is capable of handling monitors_config from Windows guests.

[Sandy Stutsman <sstutsma@xxxxxxxxxx>]

If the client hasn't been updated to handle non multi-hat monitors_config,
vd_agent will won't issue the MONITORS_CONFIG driver escape.

This addresses: rhbz#1248196
---
 vdagent/desktop_layout.cpp | 4 ++++
 vdagent/desktop_layout.h   | 5 +++--
 vdagent/vdagent.cpp        | 4 ++++
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/vdagent/desktop_layout.cpp b/vdagent/desktop_layout.cpp
index 7a34f7f..db9047f 100644
--- a/vdagent/desktop_layout.cpp
+++ b/vdagent/desktop_layout.cpp
@@ -35,6 +35,7 @@ void DisplayMode::set_res(DWORD width, DWORD height, DWORD depth)
 DesktopLayout::DesktopLayout()
     : _total_width (0)
     , _total_height (0)
+    , _configurable(0)
 {
     MUTEX_INIT(_mutex);
     get_displays();
@@ -365,6 +366,9 @@ bool DesktopLayout::update_monitor_config(LPCTSTR dev_name, DisplayMode* mode)
     if (!mode || !mode->get_attached())
         return false;
 
+    //Don't configure monitors unless the client supports it
+    if(!_configurable) return FALSE;
+
     HDC hdc = CreateDC(dev_name, NULL, NULL, NULL);
 
     memset(&monitor_config, 0, sizeof(monitor_config));
diff --git a/vdagent/desktop_layout.h b/vdagent/desktop_layout.h
index 0e310e3..a2d32d4 100644
--- a/vdagent/desktop_layout.h
+++ b/vdagent/desktop_layout.h
@@ -73,22 +73,23 @@ public:
     size_t get_display_count() { return _displays.size();}
     DWORD get_total_width() { return _total_width;}
     DWORD get_total_height() { return _total_height;}
-
+    void set_configurable(bool flag) { _configurable = flag; }
 private:
     void clean_displays();
     void normalize_displays_pos();
     DisplayMode * get_primary_display();
+    bool update_monitor_config(LPCTSTR dev_name, DisplayMode* mode);
     static bool consistent_displays();
     static bool is_attached(LPCTSTR dev_name);
     static bool get_qxl_device_id(WCHAR* device_key, DWORD* device_id);
     static bool init_dev_mode(LPCTSTR dev_name, DEVMODE* dev_mode, DisplayMode* mode,
                               LONG normal_x, LONG normal_y, bool set_pos);
-    static bool update_monitor_config(LPCTSTR dev_name, DisplayMode* mode);
 private:
     mutex_t _mutex;
     Displays _displays;
     DWORD _total_width;
     DWORD _total_height;
+    bool _configurable;
 };
 
 #endif
diff --git a/vdagent/vdagent.cpp b/vdagent/vdagent.cpp
index efce981..d8c6bd2 100644
--- a/vdagent/vdagent.cpp
+++ b/vdagent/vdagent.cpp
@@ -835,6 +835,10 @@ bool VDAgent::handle_announce_capabilities(VDAgentAnnounceCapabilities* announce
         _client_caps_size = caps_size;
     }
     memcpy(_client_caps, announce_capabilities->caps, sizeof(_client_caps[0]) * caps_size);
+
+    _desktop_layout->set_configurable(VD_AGENT_HAS_CAPABILITY(_client_caps,
+                                     _client_caps_size,
+                                     VD_AGENT_CAP_MONITORS_CONFIG_POSITION));
     if (announce_capabilities->request) {
         return send_announce_capabilities(false);
     }
-- 
1.9.5.msysgit.0
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