dlls/wineps/clipping.c

   1 /*
   2  *      PostScript clipping functions
   3  *
   4  *      Copyright 1999  Luc Tourangau
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "psdrv.h"
  22 #include "wine/debug.h"
  23 #include "winbase.h"
  24
  25 WINE_DEFAULT_DEBUG_CHANNEL(psdrv);
  26
  27 /***********************************************************************
  28  *           PSDRV_SetDeviceClipping
  29  */
  30 VOID PSDRV_SetDeviceClipping( PSDRV_PDEVICE *physDev, HRGN hrgn )
  31 {
  32     CHAR szArrayName[] = "clippath";
  33     DWORD size;
  34     RGNDATA *rgndata;
  35
  36     TRACE("hdc=%04x\n", physDev->hdc);
  37
  38     size = GetRegionData(hrgn, 0, NULL);
  39     if(!size) {
  40         ERR("Invalid region\n");
  41         return;
  42     }
  43
  44     rgndata = HeapAlloc( GetProcessHeap(), 0, size );
  45     if(!rgndata) {
  46         ERR("Can't allocate buffer\n");
  47         return;
  48     }
  49
  50     GetRegionData(hrgn, size, rgndata);
  51
  52     PSDRV_WriteInitClip(physDev);
  53
  54     /* check for NULL region */
  55     if (rgndata->rdh.nCount == 0)
  56     {
  57         /* set an empty clip path. */
  58         PSDRV_WriteRectClip(physDev, 0, 0, 0, 0);
  59     }
  60     /* optimize when it is a simple region */
  61     else if (rgndata->rdh.nCount == 1)
  62     {
  63         RECT *pRect = (RECT *)rgndata->Buffer;
  64
  65         PSDRV_WriteRectClip(physDev, pRect->left, pRect->top,
  66                             pRect->right - pRect->left,
  67                             pRect->bottom - pRect->top);
  68     }
  69     else
  70     {
  71         INT i;
  72         RECT *pRect = (RECT *)rgndata->Buffer;
  73
  74         PSDRV_WriteArrayDef(physDev, szArrayName, rgndata->rdh.nCount * 4);
  75
  76         for (i = 0; i < rgndata->rdh.nCount; i++, pRect++)
  77         {
  78             PSDRV_WriteArrayPut(physDev, szArrayName, i * 4,
  79                                 pRect->left);
  80             PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 1,
  81                                 pRect->top);
  82             PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 2,
  83                                 pRect->right - pRect->left);
  84             PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 3,
  85                                 pRect->bottom - pRect->top);
  86         }
  87
  88         PSDRV_WriteRectClip2(physDev, szArrayName);
  89     }
  90
  91     HeapFree( GetProcessHeap(), 0, rgndata );
  92     return;
  93 }