windows/clipping.c

   1 /*
   2  * Window clipping functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 static char Copyright[] = "Copyright  Alexandre Julliard, 1993";
   8
   9 #include <stdio.h>
  10
  11 #include "windows.h"
  12 #include "win.h"
  13
  14
  15 /***********************************************************************
  16  *           InvalidateRgn   (USER.126)
  17  */
  18 void InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
  19 {
  20     HRGN newRgn;
  21     WND * wndPtr = WIN_FindWndPtr( hwnd );
  22     if (!wndPtr) return;
  23
  24     if (!hrgn)
  25     {
  26         newRgn = CreateRectRgn(0, 0,
  27                    wndPtr->rectClient.right-wndPtr->rectClient.left,
  28                    wndPtr->rectClient.bottom-wndPtr->rectClient.top );
  29     }
  30     else
  31     {
  32         if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return;
  33         if (!wndPtr->hrgnUpdate) CombineRgn( newRgn, hrgn, 0, RGN_COPY );
  34         else CombineRgn( newRgn, wndPtr->hrgnUpdate, hrgn, RGN_OR );
  35     }
  36     if (wndPtr->hrgnUpdate) DeleteObject( wndPtr->hrgnUpdate );
  37     wndPtr->hrgnUpdate = newRgn;
  38     if (erase) wndPtr->flags |= WIN_ERASE_UPDATERGN;
  39 }
  40
  41
  42 /***********************************************************************
  43  *           InvalidateRect   (USER.125)
  44  */
  45 void InvalidateRect( HWND hwnd, LPRECT rect, BOOL erase )
  46 {
  47     HRGN hrgn = 0;
  48
  49     WND * wndPtr = WIN_FindWndPtr( hwnd );
  50     if (!wndPtr) return;
  51
  52 #ifdef DEBUG_WIN
  53     if (rect) printf( "InvalidateRect: %d %d,%d-%d,%d\n", hwnd,
  54                      rect->left, rect->top, rect->right, rect->bottom );
  55     else printf( "InvalidateRect: %d NULL\n", hwnd );
  56 #endif
  57     if (rect) hrgn = CreateRectRgnIndirect( rect );
  58     InvalidateRgn( hwnd, hrgn, erase );
  59     if (hrgn) DeleteObject( hrgn );
  60 }
  61
  62
  63 /***********************************************************************
  64  *           ValidateRgn   (USER.128)
  65  */
  66 void ValidateRgn( HWND hwnd, HRGN hrgn )
  67 {
  68     HRGN newRgn;
  69     WND * wndPtr = WIN_FindWndPtr( hwnd );
  70     if (!wndPtr) return;
  71
  72     if (!wndPtr->hrgnUpdate) return;
  73     if (!hrgn) newRgn = 0;
  74     else
  75     {
  76         if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return;
  77         if (CombineRgn( newRgn, wndPtr->hrgnUpdate, hrgn, RGN_DIFF ) == NULLREGION)
  78         {
  79             DeleteObject( newRgn );
  80             newRgn = 0;
  81         }
  82     }
  83     DeleteObject( wndPtr->hrgnUpdate );
  84     wndPtr->hrgnUpdate = newRgn;
  85     if (!wndPtr->hrgnUpdate) wndPtr->flags &= ~WIN_ERASE_UPDATERGN;
  86 }
  87
  88
  89 /***********************************************************************
  90  *           ValidateRect   (USER.127)
  91  */
  92 void ValidateRect( HWND hwnd, LPRECT rect )
  93 {
  94     HRGN hrgn = 0;
  95
  96     WND * wndPtr = WIN_FindWndPtr( hwnd );
  97     if (!wndPtr) return;
  98
  99     if (rect) hrgn = CreateRectRgnIndirect( rect );
 100     ValidateRgn( hwnd, hrgn );
 101     if (hrgn) DeleteObject( hrgn );
 102 }
 103
 104
 105 /***********************************************************************
 106  *           GetUpdateRect   (USER.190)
 107  */
 108 BOOL GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
 109 {
 110     BOOL retval;
 111     WND * wndPtr = WIN_FindWndPtr( hwnd );
 112     if (!wndPtr) return FALSE;
 113
 114     retval = (wndPtr->hrgnUpdate != 0);
 115
 116     if (rect)
 117     {
 118         if (wndPtr->hrgnUpdate) GetRgnBox( wndPtr->hrgnUpdate, rect );
 119         else SetRectEmpty( rect );
 120         if (erase && wndPtr->hrgnUpdate)
 121         {
 122             HDC hdc = GetDC( hwnd );
 123             if (hdc)
 124             {
 125                 SendMessage( hwnd, WM_ERASEBKGND, hdc, 0 );
 126                 ReleaseDC( hwnd, hdc );
 127             }
 128         }
 129     }
 130     GlobalUnlock( hwnd );
 131     return retval;
 132 }
 133
 134
 135 /***********************************************************************
 136  *           GetUpdateRgn   (USER.237)
 137  */
 138 int GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
 139 {
 140     int retval;
 141     WND * wndPtr = WIN_FindWndPtr( hwnd );
 142     if (!wndPtr) return ERROR;
 143
 144     if (erase && wndPtr->hrgnUpdate)
 145     {
 146         HDC hdc = GetDC( hwnd );
 147         if (hdc)
 148         {
 149             SendMessage( hwnd, WM_ERASEBKGND, hdc, 0 );
 150             ReleaseDC( hwnd, hdc );
 151         }
 152     }
 153     retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
 154     GlobalUnlock( hwnd );
 155     return retval;
 156 }