[PATCH 3/5] win32u: Store EDID in monitors cache.

[Paul Gofman]

From: Paul Gofman

---
 dlls/win32u/sysparams.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index 8ca12d4f808..283d40e2e29 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -170,6 +170,7 @@ static const WCHAR monitorW[] = {'M','o','n','i','t','o','r',0};
 static const WCHAR yesW[] = {'Y','e','s',0};
 static const WCHAR noW[] = {'N','o',0};
 static const WCHAR mode_countW[] = {'M','o','d','e','C','o','u','n','t',0};
+static const WCHAR edidW[] = {'E','D','I','D',0};

static const char  guid_devclass_displayA[] = "{4D36E968-E325-11CE-BFC1-08002BE10318}";
 static const WCHAR guid_devclass_displayW[] =
@@ -230,6 +231,8 @@ struct monitor
     RECT rc_monitor;
     RECT rc_work;
     BOOL is_clone;
+    unsigned char *edid;
+    unsigned int edid_len;
 };

static struct list adapters = LIST_INIT(adapters);
@@ -717,7 +720,7 @@ static BOOL read_monitor_settings( struct adapter *adapter, UINT index, struct m
     char buffer[4096];
     KEY_VALUE_PARTIAL_INFORMATION *value = (void *)buffer;
     WCHAR *device_name, *value_str = (WCHAR *)value->Data, *ptr;
-    HKEY hkey;
+    HKEY hkey, subkey;
     DWORD size, len;

monitor->flags = adapter->id ? 0 : MONITORINFOF_PRIMARY;
@@ -824,6 +827,17 @@ static BOOL read_monitor_settings( struct adapter *adapter, UINT index, struct m
     monitor->dev.device_id[size++] = '\';
     lstrcpyW( monitor->dev.device_id + size, device_name );

+    /* EDID */
+    if ((subkey = reg_open_key( hkey, device_parametersW, sizeof(device_parametersW) )))
+    {
+        if (query_reg_value( subkey, edidW, value, sizeof(buffer) ) && (monitor->edid = malloc( value->DataLength )))
+        {
+            monitor->edid_len = value->DataLength;
+            memcpy( monitor->edid, value->Data, monitor->edid_len );
+        }
+        NtClose( subkey );
+    }
+
     NtClose( hkey );
     return TRUE;
 }
@@ -1367,7 +1381,6 @@ static void add_monitor( const struct gdi_monitor *monitor, void *param )
     if ((subkey = reg_create_key( hkey, device_parametersW, sizeof(device_parametersW), 0, NULL )))
     {
         static const WCHAR bad_edidW[] = {'B','A','D','_','E','D','I','D',0};
-        static const WCHAR edidW[] = {'E','D','I','D',0};

if (monitor->edid_len)
             set_reg_value( subkey, edidW, REG_BINARY, monitor->edid, monitor->edid_len );
@@ -1500,6 +1513,7 @@ static void clear_display_devices(void)
         monitor = LIST_ENTRY( list_head( &monitors ), struct monitor, entry );
         adapter_release( monitor->adapter );
         list_remove( &monitor->entry );
+        free( monitor->edid );
         free( monitor );
     }