From 94876d81ce4b7e8ae1080a02b943a5557bce72c7 Mon Sep 17 00:00:00 2001
From: Jacek Caban <jacek@codeweavers.com>
Date: Wed, 7 Jul 2021 15:02:26 +0200
Subject: [PATCH] gdi32: Introduce NtGdiExtCreateRegion.

Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/gdi32/objects.c | 16 ++++++++++++++++
 dlls/gdi32/region.c  | 18 ++++++------------
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/dlls/gdi32/objects.c b/dlls/gdi32/objects.c
index 16c03f56508..54a5fcef585 100644
--- a/dlls/gdi32/objects.c
+++ b/dlls/gdi32/objects.c
@@ -235,3 +235,19 @@ HBITMAP WINAPI CreateDiscardableBitmap( HDC hdc, INT width, INT height )
 {
     return CreateCompatibleBitmap( hdc, width, height );
 }
+
+/***********************************************************************
+ *           ExtCreateRegion   (GDI32.@)
+ *
+ * Creates a region as specified by the transformation data and region data.
+ */
+HRGN WINAPI ExtCreateRegion( const XFORM *xform, DWORD count, const RGNDATA *data )
+{
+    if (!data)
+    {
+        SetLastError( ERROR_INVALID_PARAMETER );
+        return 0;
+    }
+
+    return NtGdiExtCreateRegion( xform, count, data );
+}
diff --git a/dlls/gdi32/region.c b/dlls/gdi32/region.c
index 2e90e82180e..dadb9b80ac9 100644
--- a/dlls/gdi32/region.c
+++ b/dlls/gdi32/region.c
@@ -920,7 +920,7 @@ static void translate( POINT *pt, UINT count, const XFORM *xform )
 
 
 /***********************************************************************
- *           ExtCreateRegion   (GDI32.@)
+ *           NtGdiExtCreateRegion   (win32u.@)
  *
  * Creates a region as specified by the transformation data and region data.
  *
@@ -936,26 +936,20 @@ static void translate( POINT *pt, UINT count, const XFORM *xform )
  * NOTES
  *   See GetRegionData().
  */
-HRGN WINAPI ExtCreateRegion( const XFORM* lpXform, DWORD dwCount, const RGNDATA* rgndata)
+HRGN WINAPI NtGdiExtCreateRegion( const XFORM *xform, DWORD count, const RGNDATA *rgndata )
 {
     HRGN hrgn = 0;
     WINEREGION *obj;
     const RECT *pCurRect, *pEndRect;
 
-    if (!rgndata)
-    {
-        SetLastError( ERROR_INVALID_PARAMETER );
-        return 0;
-    }
-
-    if (rgndata->rdh.dwSize < sizeof(RGNDATAHEADER))
+    if (!rgndata || rgndata->rdh.dwSize < sizeof(RGNDATAHEADER))
         return 0;
 
     /* XP doesn't care about the type */
     if( rgndata->rdh.iType != RDH_RECTANGLES )
         WARN("(Unsupported region data type: %u)\n", rgndata->rdh.iType);
 
-    if (lpXform)
+    if (xform)
     {
         const RECT *pCurRect, *pEndRect;
 
@@ -977,7 +971,7 @@ HRGN WINAPI ExtCreateRegion( const XFORM* lpXform, DWORD dwCount, const RGNDATA*
             pt[3].x = pCurRect->left;
             pt[3].y = pCurRect->bottom;
 
-            translate( pt, 4, lpXform );
+            translate( pt, 4, xform );
             poly_hrgn = CreatePolyPolygonRgn( pt, &count, 1, WINDING );
             CombineRgn( hrgn, hrgn, poly_hrgn, RGN_OR );
             DeleteObject( poly_hrgn );
@@ -1000,7 +994,7 @@ HRGN WINAPI ExtCreateRegion( const XFORM* lpXform, DWORD dwCount, const RGNDATA*
 done:
     if (!hrgn) free_region( obj );
 
-    TRACE("%p %d %p returning %p\n", lpXform, dwCount, rgndata, hrgn );
+    TRACE("%p %d %p returning %p\n", xform, count, rgndata, hrgn );
     return hrgn;
 }