Change offsets returned to include 4 separate values

Instead of assuming a symmetrical border (which is inaccurate), this
updated function will now return an offset value for each of the 4 sides
of a given window.

WinGetPosEx.ahk

@@ -2,6 +2,10 @@
 ;
 ; Function: WinGetPosEx
 ;
+; Original author: jballi (https://autohotkey.com/boards/viewtopic.php?t=3392)
+;
+; Update author: RiseUp
+;
 ; Description:
 ;
 ;   Gets the position, size, and offset of a window. See the *Remarks* section
@@ -16,24 +20,25 @@
 ;       upper-left corner of the screen (X and Y), and the Width and Height of
 ;       the window.
 ;
-;   Offset_X, Offset_Y - Output variables. [Optional] Offset, in pixels, of the
-;       actual position of the window versus the position of the window as
-;       reported by GetWindowRect.  If moving the window to specific
-;       coordinates, add these offset values to the appropriate coordinate
-;       (X and/or Y) to reflect the true size of the window.
+;   Offset_Left, Offset_Top, Offset_Right, Offset_Bottom - Output variables. 
+;		[Optional] Offset, in pixels, of the actual position of the window
+;		versus the position of the window as reported by GetWindowRect.  If
+;		moving the window to specific coordinates, add these offset values to
+;		the appropriate coordinate (X and/or Y) to reflect the true size of the
+;		window.
 ;
 ; Returns:
 ;
 ;   If successful, the address of a RECTPlus structure is returned.  The first
 ;   16 bytes contains a RECT structure that contains the dimensions of the
 ;   bounding rectangle of the specified window.  The dimensions are given in
 ;   screen coordinates that are relative to the upper-left corner of the screen.
-;   The next 8 bytes contain the X and Y offsets (4-byte integer for X and
-;   4-byte integer for Y).
+;   The next 16 bytes contain the offsets (4-byte integer for each of left,
+;	top, right, and bottom offsets).
 ;
 ;   Also if successful (and if defined), the output variables (X, Y, Width,
-;   Height, Offset_X, and Offset_Y) are updated.  See the *Parameters* section
-;   for more more information.
+;   Height, Offset_Left, Offset_Top, Offset_Right, and Offset_Bottom) are
+;	updated.  See the *Parameters* section for more more information.
 ;
 ;   If not successful, FALSE is returned.
 ;
@@ -69,12 +74,19 @@
 ;   it.  When DWM is a possibility (i.e. Vista+), a developer-friendly messsage
 ;   will be dumped to the debugger when these errors occur.
 ;
+; * 20171126: (RiseUp) Changed function to return 4 offset values instead of 2.
+;	Windows 10 has different offsets for the top versus the bottom of a window,
+;	so this function no longer assumes a symmetrical offset border around a
+;	given window.
+;
 ; Credit:
 ;
 ;   Idea and some code from *KaFu* (AutoIt forum)
 ;
 ;-------------------------------------------------------------------------------
-WinGetPosEx(hWindow,ByRef X="",ByRef Y="",ByRef Width="",ByRef Height="",ByRef Offset_X="",ByRef Offset_Y="")
+WinGetPosEx(hWindow,ByRef X="",ByRef Y="",ByRef Width="",ByRef Height=""
+			,ByRef Offset_Left="",ByRef Offset_Top=""
+			,ByRef Offset_Right="",ByRef Offset_Bottom="")
     {
     Static Dummy5693
           ,RECTPlus
@@ -87,7 +99,7 @@ WinGetPosEx(hWindow,ByRef X="",ByRef Y="",ByRef Width="",ByRef Height="",ByRef O
     ;-- Get the window's dimensions
     ;   Note: Only the first 16 bytes of the RECTPlus structure are used by the
     ;   DwmGetWindowAttribute and GetWindowRect functions.
-    VarSetCapacity(RECTPlus,24,0)
+    VarSetCapacity(RECTPlus,32,0)
     DWMRC:=DllCall("dwmapi\DwmGetWindowAttribute"
         ,PtrType,hWindow                                ;-- hwnd
         ,"UInt",DWMWA_EXTENDED_FRAME_BOUNDS             ;-- dwAttribute
@@ -116,14 +128,16 @@ WinGetPosEx(hWindow,ByRef X="",ByRef Y="",ByRef Width="",ByRef Height="",ByRef O
         }
 
     ;-- Populate the output variables
-    X:=Left :=NumGet(RECTPlus,0,"Int")
-    Y:=Top  :=NumGet(RECTPlus,4,"Int")
-    Right   :=NumGet(RECTPlus,8,"Int")
-    Bottom  :=NumGet(RECTPlus,12,"Int")
-    Width   :=Right-Left
-    Height  :=Bottom-Top
-    OffSet_X:=0
-    OffSet_Y:=0
+    X:=Left       := NumGet(RECTPlus,0,"Int")
+    Y:=Top        := NumGet(RECTPlus,4,"Int")
+    Right         := NumGet(RECTPlus,8,"Int")
+    Bottom        := NumGet(RECTPlus,12,"Int")
+    Width         := Right-Left
+    Height        := Bottom-Top
+    Offset_Left   := 0
+    Offset_Top    := 0
+    Offset_Right  := 0
+    Offset_Bottom := 0
 
     ;-- If DWM is not used (older than Vista or DWM not enabled), we're done
     if (DWMRC<>S_OK)
@@ -132,13 +146,16 @@ WinGetPosEx(hWindow,ByRef X="",ByRef Y="",ByRef Width="",ByRef Height="",ByRef O
     ;-- Collect dimensions via GetWindowRect
     VarSetCapacity(RECT,16,0)
     DllCall("GetWindowRect",PtrType,hWindow,PtrType,&RECT)
-    GWR_Width :=NumGet(RECT,8,"Int")-NumGet(RECT,0,"Int")
-        ;-- Right minus Left
-    GWR_Height:=NumGet(RECT,12,"Int")-NumGet(RECT,4,"Int")
-        ;-- Bottom minus Top
-
-    ;-- Calculate offsets and update output variables
-    NumPut(Offset_X:=(Width-GWR_Width)//2,RECTPlus,16,"Int")
-    NumPut(Offset_Y:=(Height-GWR_Height)//2,RECTPlus,20,"Int")
+	GWR_Left   := NumGet(RECT,0,"Int")
+	GWR_Top    := NumGet(RECT,4,"Int")
+	GWR_Right  := NumGet(RECT,8,"Int")
+	GWR_Bottom := NumGet(RECT,12,"Int")
+
+	;-- Calculate offsets and update output variables
+	NumPut(Offset_Left   := Left       - GWR_Left,RECTPlus,16,"Int")
+	NumPut(Offset_Top    := Top        - GWR_Top ,RECTPlus,20,"Int")
+	NumPut(Offset_Right  := GWR_Right  - Right   ,RECTPlus,24,"Int")
+	NumPut(Offset_Bottom := GWR_Bottom - Bottom  ,RECTPlus,28,"Int")
+
     Return &RECTPlus
     }