[PATCH 1/1] win32u: virtual desktop for explorer.exe support different resolutions

[Fan WenJie]

From: Fan WenJie

fix: https://bugs.winehq.org/show_bug.cgi?id=56993
Signed-off-by: Fan WenJie 
---
 dlls/win32u/sysparams.c | 35 ++++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

diff --git a/dlls/win32u/sysparams.c b/dlls/win32u/sysparams.c
index edf1a705168..95e860ed502 100644
--- a/dlls/win32u/sysparams.c
+++ b/dlls/win32u/sysparams.c
@@ -84,6 +84,8 @@ static const char guid_devinterface_display_adapterA[] = "{5B45201D-F2F2-4F3B-85
 static const char guid_display_device_arrivalA[] = "{1CA05180-A699-450A-9A0C-DE4FBE3DDD89}";
 static const char guid_devinterface_monitorA[] = "{E6F07B5F-EE97-4A90-B076-33F57BF4EAA7}";

+static struct source *find_primary_source(void);
+
 #define NEXT_DEVMODEW(mode) ((DEVMODEW *)((char *)((mode) + 1) + (mode)->dmDriverExtra))

struct gpu
@@ -152,6 +154,7 @@ BOOL enable_thunk_lock = FALSE;
 #define VIRTUAL_HMONITOR ((HMONITOR)(UINT_PTR)(0x10000 + 1))
 static struct monitor virtual_monitor =
 {
+    .path = "DISPLAY\DEFAULT_MONITOR\FFFF&FFFF",
     .handle = VIRTUAL_HMONITOR,
     .rc_monitor.right = 1024,
     .rc_monitor.bottom = 768,
@@ -1388,9 +1391,11 @@ static BOOL write_monitor_to_registry( struct monitor *monitor, const BYTE *edid
     WCHAR bufferW[1024];
     HKEY hkey, subkey;
     unsigned int len;
+    struct source* source = monitor->source;

if (!(hkey = reg_create_ascii_key( enum_key, monitor->path, 0, NULL ))) return FALSE;

+    if (!source) source = find_primary_source();
     set_reg_ascii_value( hkey, "DeviceDesc", "Generic Non-PnP Monitor" );

set_reg_ascii_value( hkey, "Class", "Monitor" );
@@ -1437,7 +1442,7 @@ static BOOL write_monitor_to_registry( struct monitor *monitor, const BYTE *edid
     if ((subkey = reg_create_ascii_key( hkey, devpropkey_monitor_gpu_luidA, 0, NULL )))
     {
         set_reg_value( subkey, NULL, 0xffff0000 | DEVPROP_TYPE_INT64,
-                       &monitor->source->gpu->luid, sizeof(monitor->source->gpu->luid) );
+                       &source->gpu->luid, sizeof(source->gpu->luid) );
         NtClose( subkey );
     }

@@ -1558,8 +1563,7 @@ static void clear_display_devices(void)

if (list_head( &monitors ) == &virtual_monitor.entry)
     {
-        list_init( &monitors );
-        return;
+        list_remove(&virtual_monitor.entry);
     }

while (!list_empty( &monitors ))
@@ -1720,6 +1724,12 @@ static BOOL update_display_cache_from_registry(void)
     enum_device_keys( "PCI", guid_devclass_displayW, sizeof(guid_devclass_displayW), enum_gpus );
     enum_device_keys( "DISPLAY", guid_devclass_monitorW, sizeof(guid_devclass_monitorW), enum_monitors );

+    if (is_virtual_desktop())
+    {
+        if (list_head( &monitors ) != &virtual_monitor.entry)
+            list_add_head( &monitors, &virtual_monitor.entry );
+    }
+
     LIST_FOR_EACH_ENTRY( gpu, &gpus, struct gpu, entry )
     {
         if (!read_gpu_from_registry( gpu ))
@@ -1988,10 +1998,9 @@ static BOOL add_virtual_source( struct device_manager_ctx *ctx )
 static UINT update_display_devices( struct device_manager_ctx *ctx )
 {
     UINT status;
-
+    
     if (!(status = user_driver->pUpdateDisplayDevices( &device_manager, ctx )))
     {
-        if (ctx->source_count && is_virtual_desktop()) return add_virtual_source( ctx );
         return status;
     }

@@ -3257,7 +3266,13 @@ static void display_mode_changed( BOOL broadcast )
         ERR( "Failed to update display cache after mode change.\n" );
         return;
     }
-    if (!get_primary_source_mode( &current_mode ))
+    if (is_virtual_desktop())
+    {
+        current_mode.dmPelsWidth = virtual_monitor.rc_monitor.right - virtual_monitor.rc_monitor.left;
+        current_mode.dmPelsHeight = virtual_monitor.rc_monitor.bottom - virtual_monitor.rc_monitor.top;
+        current_mode.dmBitsPerPel = 32;
+    }
+    else if (!get_primary_source_mode( &current_mode ))
     {
         ERR( "Failed to get primary source current display settings.\n" );
         return;
@@ -3318,7 +3333,13 @@ static LONG apply_display_settings( struct source *target, const DEVMODEW *devmo
     }

/* use the default implementation in virtual desktop mode */
-    if (is_virtual_desktop()) ret = E_NOTIMPL;
+    if (is_virtual_desktop()) 
+    {
+        RECT rect = { 0, 0, displays->dmPelsWidth, displays->dmPelsHeight };
+        virtual_monitor.rc_monitor = virtual_monitor.rc_work = rect;
+        write_monitor_to_registry(&virtual_monitor, NULL, 0);
+        ret = DISP_CHANGE_SUCCESSFUL;
+    }
     else ret = user_driver->pChangeDisplaySettings( displays, primary_name, hwnd, flags, lparam );

if (ret == E_NOTIMPL)