Use an escape mechanism similar to the x11drv one to set the DC

dlls/ttydrv/dc.c

@@ -183,3 +183,43 @@ DWORD TTYDRV_SetDCOrg( TTYDRV_PDEVICE *physDev, INT x, INT y )
     physDev->org.y = y;
     return ret;
 }
+
+
+/**********************************************************************
+ *           ExtEscape  (X11DRV.@)
+ */
+INT TTYDRV_ExtEscape( TTYDRV_PDEVICE *physDev, INT escape, INT in_count, LPCVOID in_data,
+                      INT out_count, LPVOID out_data )
+{
+    switch(escape)
+    {
+    case QUERYESCSUPPORT:
+        if (in_data)
+        {
+            switch (*(const INT *)in_data)
+            {
+            case TTYDRV_ESCAPE:
+                return TRUE;
+            }
+        }
+        break;
+
+    case TTYDRV_ESCAPE:
+        if (in_data && in_count >= sizeof(enum ttydrv_escape_codes))
+        {
+            switch(*(const enum ttydrv_escape_codes *)in_data)
+            {
+            case TTYDRV_SET_DRAWABLE:
+                if (in_count >= sizeof(struct ttydrv_escape_set_drawable))
+                {
+                    const struct ttydrv_escape_set_drawable *data = (const struct ttydrv_escape_set_drawable *)in_data;
+                    physDev->org = data->org;
+                    return TRUE;
+                }
+                break;
+            }
+        }
+        break;
+    }
+    return 0;
+}

dlls/ttydrv/ttydrv.h

@@ -100,6 +100,18 @@ INT TTYDRV_DC_SetDIBitsToDevice(TTYDRV_PDEVICE *physDev, INT xDest, INT yDest, D
 
 extern BOOL TTYDRV_PALETTE_Initialize(void);
 
+#define TTYDRV_ESCAPE 6999
+enum ttydrv_escape_codes
+{
+    TTYDRV_SET_DRAWABLE      /* set current drawable for a DC */
+};
+
+struct ttydrv_escape_set_drawable
+{
+    enum ttydrv_escape_codes code;         /* escape code (TTYDRV_SET_DRAWABLE) */
+    POINT                    org;          /* origin of DC relative to drawable */
+};
+
 /**************************************************************************
  * TTY USER driver
  */

dlls/ttydrv/ttydrv.spec

@@ -6,6 +6,7 @@
 @ cdecl CreateDC(long ptr wstr wstr wstr ptr) TTYDRV_DC_CreateDC
 @ cdecl DeleteDC(ptr) TTYDRV_DC_DeleteDC
 @ cdecl Ellipse(ptr long long long long) TTYDRV_DC_Ellipse
+@ cdecl ExtEscape(ptr long long ptr long ptr) TTYDRV_ExtEscape
 @ cdecl ExtFloodFill(ptr long long long long) TTYDRV_DC_ExtFloodFill
 @ cdecl ExtTextOut(ptr long long long ptr ptr long ptr long) TTYDRV_DC_ExtTextOut
 @ cdecl GetBitmapBits(long ptr long) TTYDRV_GetBitmapBits

dlls/ttydrv/wnd.c

@@ -414,22 +414,23 @@ BOOL TTYDRV_GetDC( HWND hwnd, HDC hdc, HRGN hrgn, DWORD flags )
 {
     WND *wndPtr = WIN_FindWndPtr(hwnd);
     HRGN hrgnVisible = 0;
-    POINT org;
+    struct ttydrv_escape_set_drawable escape;
 
     if (!wndPtr) return FALSE;
 
     if(flags & DCX_WINDOW)
     {
-        org.x = wndPtr->rectWindow.left;
-        org.y = wndPtr->rectWindow.top;
+        escape.org.x = wndPtr->rectWindow.left;
+        escape.org.y = wndPtr->rectWindow.top;
     }
     else
     {
-        org.x = wndPtr->rectClient.left;
-        org.y = wndPtr->rectClient.top;
+        escape.org.x = wndPtr->rectClient.left;
+        escape.org.y = wndPtr->rectClient.top;
     }
 
-    SetDCOrg16( HDC_16(hdc), org.x, org.y );
+    escape.code = TTYDRV_SET_DRAWABLE;
+    ExtEscape( hdc, TTYDRV_ESCAPE, sizeof(escape), (LPSTR)&escape, 0, NULL );
 
     if (SetHookFlags16( HDC_16(hdc), DCHF_VALIDATEVISRGN ) ||  /* DC was dirty */
         ( flags & (DCX_EXCLUDERGN | DCX_INTERSECTRGN) ))
@@ -463,7 +464,7 @@ BOOL TTYDRV_GetDC( HWND hwnd, HDC hdc, HRGN hrgn, DWORD flags )
         else
         {
             hrgnVisible = DCE_GetVisRgn( hwnd, flags, 0, 0 );
-            OffsetRgn( hrgnVisible, org.x, org.y );
+            OffsetRgn( hrgnVisible, escape.org.x, escape.org.y );
         }
 
         /* apply additional region operation (if any) */