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 #include "message.h"
  14
  15
  16 /***********************************************************************
  17  *           InvalidateRgn   (USER.126)
  18  */
  19 void InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
  20 {
  21     HRGN newRgn;
  22     WND * wndPtr = WIN_FindWndPtr( hwnd );
  23     if (!wndPtr) return;
  24
  25     if (!hrgn)
  26     {
  27         newRgn = CreateRectRgn(0, 0,
  28                    wndPtr->rectClient.right-wndPtr->rectClient.left,
  29                    wndPtr->rectClient.bottom-wndPtr->rectClient.top );
  30     }
  31     else
  32     {
  33         if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return;
  34         if (!wndPtr->hrgnUpdate) CombineRgn( newRgn, hrgn, 0, RGN_COPY );
  35         else CombineRgn( newRgn, wndPtr->hrgnUpdate, hrgn, RGN_OR );
  36     }
  37     if (wndPtr->hrgnUpdate) DeleteObject( wndPtr->hrgnUpdate );
  38     else MSG_IncPaintCount( wndPtr->hmemTaskQ );
  39     wndPtr->hrgnUpdate = newRgn;
  40     if (erase) wndPtr->flags |= WIN_ERASE_UPDATERGN;
  41
  42       /* Invalidate the children overlapping the region */
  43
  44     if (wndPtr->dwStyle & WS_CLIPCHILDREN) return;
  45     for (hwnd = wndPtr->hwndChild; (hwnd); hwnd = wndPtr->hwndNext)
  46     {
  47         if (!(wndPtr = WIN_FindWndPtr( hwnd ))) break;
  48         if (hrgn && !RectInRegion( hrgn, &wndPtr->rectWindow )) continue;
  49         InvalidateRgn( hwnd, hrgn, erase );
  50     }
  51 }
  52
  53
  54 /***********************************************************************
  55  *           InvalidateRect   (USER.125)
  56  */
  57 void InvalidateRect( HWND hwnd, LPRECT rect, BOOL erase )
  58 {
  59     HRGN hrgn = 0;
  60
  61     WND * wndPtr = WIN_FindWndPtr( hwnd );
  62     if (!wndPtr) return;
  63
  64 #ifdef DEBUG_WIN
  65     if (rect) printf( "InvalidateRect: %d %d,%d-%d,%d\n", hwnd,
  66                      rect->left, rect->top, rect->right, rect->bottom );
  67     else printf( "InvalidateRect: %d NULL\n", hwnd );
  68 #endif
  69     if (rect) hrgn = CreateRectRgnIndirect( rect );
  70     InvalidateRgn( hwnd, hrgn, erase );
  71     if (hrgn) DeleteObject( hrgn );
  72 }
  73
  74
  75 /***********************************************************************
  76  *           ValidateRgn   (USER.128)
  77  */
  78 void ValidateRgn( HWND hwnd, HRGN hrgn )
  79 {
  80     HRGN newRgn;
  81     WND * wndPtr = WIN_FindWndPtr( hwnd );
  82     if (!wndPtr) return;
  83
  84     if (!wndPtr->hrgnUpdate) return;
  85     if (!hrgn) newRgn = 0;
  86     else
  87     {
  88         if (!(newRgn = CreateRectRgn( 0, 0, 0, 0 ))) return;
  89         if (CombineRgn( newRgn, wndPtr->hrgnUpdate, hrgn, RGN_DIFF ) == NULLREGION)
  90         {
  91             DeleteObject( newRgn );
  92             newRgn = 0;
  93         }
  94     }
  95     DeleteObject( wndPtr->hrgnUpdate );
  96     wndPtr->hrgnUpdate = newRgn;
  97     if (!wndPtr->hrgnUpdate) wndPtr->flags &= ~WIN_ERASE_UPDATERGN;
  98 }
  99
 100
 101 /***********************************************************************
 102  *           ValidateRect   (USER.127)
 103  */
 104 void ValidateRect( HWND hwnd, LPRECT rect )
 105 {
 106     HRGN hrgn = 0;
 107
 108     WND * wndPtr = WIN_FindWndPtr( hwnd );
 109     if (!wndPtr) return;
 110
 111     if (rect) hrgn = CreateRectRgnIndirect( rect );
 112     ValidateRgn( hwnd, hrgn );
 113     if (hrgn) DeleteObject( hrgn );
 114 }
 115
 116
 117 /***********************************************************************
 118  *           GetUpdateRect   (USER.190)
 119  */
 120 BOOL GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
 121 {
 122     WND * wndPtr = WIN_FindWndPtr( hwnd );
 123     if (!wndPtr) return FALSE;
 124
 125     if (rect)
 126     {
 127         if (wndPtr->hrgnUpdate)
 128         {
 129             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 130             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR) return FALSE;
 131             GetRgnBox( hrgn, rect );
 132             DeleteObject( hrgn );
 133         }
 134         else SetRectEmpty( rect );
 135     }
 136     return (wndPtr->hrgnUpdate != 0);
 137 }
 138
 139
 140 /***********************************************************************
 141  *           GetUpdateRgn   (USER.237)
 142  */
 143 int GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
 144 {
 145     HRGN hrgnClip;
 146     int retval;
 147     WND * wndPtr = WIN_FindWndPtr( hwnd );
 148     if (!wndPtr) return ERROR;
 149
 150     if (!wndPtr->hrgnUpdate)
 151     {
 152         if (!(hrgnClip = CreateRectRgn( 0, 0, 0, 0 ))) return ERROR;
 153         retval = CombineRgn( hrgn, hrgnClip, 0, RGN_COPY );
 154     }
 155     else
 156     {
 157         hrgnClip = CreateRectRgn( 0, 0,
 158                            wndPtr->rectClient.right-wndPtr->rectClient.left,
 159                            wndPtr->rectClient.bottom-wndPtr->rectClient.top );
 160         if (!hrgnClip) return ERROR;
 161         retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, hrgnClip, RGN_AND );
 162         if (erase)
 163         {
 164             HDC hdc = GetDCEx( hwnd, wndPtr->hrgnUpdate,
 165                               DCX_INTERSECTRGN | DCX_USESTYLE );
 166             if (hdc)
 167             {
 168                 SendMessage( hwnd, WM_ERASEBKGND, hdc, 0 );
 169                 ReleaseDC( hwnd, hdc );
 170             }
 171         }
 172     }
 173     DeleteObject( hrgnClip );
 174     return retval;
 175 }