reactos/dll/win32/gdi32/misc/misc.c

   1 /*
   2  *  ReactOS GDI lib
   3  *  Copyright (C) 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * PROJECT:         ReactOS gdi32.dll
  22  * FILE:            lib/gdi32/misc/misc.c
  23  * PURPOSE:         Miscellaneous functions
  24  * PROGRAMMER:      Thomas Weidenmueller <w3seek@reactos.com>
  25  * UPDATE HISTORY:
  26  *      2004/09/04  Created
  27  */
  28
  29 #include "precomp.h"
  30
  31 PGDI_TABLE_ENTRY GdiHandleTable = NULL;
  32 HANDLE CurrentProcessId = NULL;
  33 DWORD GDI_BatchLimit = 1;
  34
  35 /*
  36  * @implemented
  37  */
  38 PVOID
  39 STDCALL
  40 GdiQueryTable(VOID)
  41 {
  42   return (PVOID)GdiHandleTable;
  43 }
  44
  45 BOOL GdiIsHandleValid(HGDIOBJ hGdiObj)
  46 {
  47   PGDI_TABLE_ENTRY Entry = GdiHandleTable + GDI_HANDLE_GET_INDEX(hGdiObj);
  48   if(Entry->KernelData != NULL && (Entry->Type & GDI_HANDLE_TYPE_MASK) == (LONG)GDI_HANDLE_GET_TYPE(hGdiObj))
  49   {
  50     HANDLE pid = (HANDLE)((ULONG_PTR)Entry->ProcessId & ~0x1);
  51     if(pid == NULL || pid == CurrentProcessId)
  52     {
  53       return TRUE;
  54     }
  55   }
  56   return FALSE;
  57 }
  58
  59 BOOL GdiGetHandleUserData(HGDIOBJ hGdiObj, PVOID *UserData)
  60 {
  61   PGDI_TABLE_ENTRY Entry = GdiHandleTable + GDI_HANDLE_GET_INDEX(hGdiObj);
  62   if(Entry->KernelData != NULL && (Entry->Type & GDI_HANDLE_TYPE_MASK) == (LONG)GDI_HANDLE_GET_TYPE(hGdiObj))
  63   {
  64     HANDLE pid = (HANDLE)((ULONG_PTR)Entry->ProcessId & ~0x1);
  65     if(pid == NULL || pid == CurrentProcessId)
  66     {
  67       *UserData = Entry->UserData;
  68       return TRUE;
  69     }
  70   }
  71   return FALSE;
  72 }
  73
  74 PLDC GdiGetLDC(HDC hDC)
  75 {
  76     PDC_ATTR Dc_Attr;
  77     if (!GdiGetHandleUserData((HGDIOBJ) hDC, (PVOID) &Dc_Attr))
  78       return NULL;
  79     return Dc_Attr->pvLDC;
  80 }
  81
  82 /*
  83  * @implemented
  84  */
  85 DWORD
  86 STDCALL
  87 GdiSetBatchLimit(DWORD  Limit)
  88 {
  89   DWORD OldLimit = GDI_BatchLimit;
  90     if ((!Limit) || (Limit > GDI_BATCH_LIMIT)) return Limit;
  91     GdiFlush();
  92     GDI_BatchLimit = Limit;
  93     return OldLimit;
  94 }
  95
  96
  97 /*
  98  * @implemented
  99  */
 100 DWORD
 101 STDCALL
 102 GdiGetBatchLimit()
 103 {
 104     return GDI_BatchLimit;
 105 }