introduce turn_monitor_off method of WDDM interface

Adding method 'turn_monitor_off' to WDDM interface.
It sends QXL_ESCAPE_MONITOR_CONFIG escape with zeroed
display size to qxl-wddm-dod driver.

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/vdagent/display_configuration.cpp b/vdagent/display_configuration.cpp
index bb2fb80..8a694aa 100644
--- a/vdagent/display_configuration.cpp
+++ b/vdagent/display_configuration.cpp
@@ -488,6 +488,23 @@ bool WDDMInterface::update_monitor_config(LPCTSTR device_name, DisplayMode* disp
 
 }
 
+bool WDDMInterface::turn_monitor_off(LPCTSTR device_name)
+{
+    vd_printf("for %S", device_name);
+    if (!_send_monitors_config) {
+        vd_printf("do nothing as _send_monitors_config is off");
+        return false;
+    }
+
+    WDDMMonitorConfigEscape wddm_escape(NULL);
+    if (escape(device_name, &wddm_escape, sizeof(wddm_escape))) {
+        return true;
+    }
+
+    vd_printf("%S failed", device_name);
+    return false;
+}
+
 LONG WDDMInterface::update_display_settings()
 {
     LONG error(0);
diff --git a/vdagent/display_configuration.h b/vdagent/display_configuration.h
index 7b5578e..bdf89dc 100644
--- a/vdagent/display_configuration.h
+++ b/vdagent/display_configuration.h
@@ -160,6 +160,7 @@ private:
 
     void close_adapter(D3D_HANDLE handle);
     bool escape(LPCTSTR device_name, void* data, UINT sizeData);
+    bool turn_monitor_off(LPCTSTR device_name);
 
     //GDI Function pointers
     PFND3DKMT_OPENADAPTERFROMHDC _pfnOpen_adapter_hdc;