dlls/wineps.drv/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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_SetClip
  29  *
  30  * The idea here is that every graphics operation should bracket
  31  * output in PSDRV_SetClip/ResetClip calls.  The clip path outside
  32  * these calls will be empty; the reason for this is that it is
  33  * impossible in PostScript to cleanly make the clip path larger than
  34  * the current one.  Also Photoshop assumes that despite having set a
  35  * small clip area in the printer dc that it can still write raw
  36  * PostScript to the driver and expect this code not to be clipped.
  37  */
  38 void PSDRV_SetClip( PSDRV_PDEVICE *physDev )
  39 {
  40     CHAR szArrayName[] = "clippath";
  41     DWORD size;
  42     RGNDATA *rgndata = NULL;
  43     HRGN hrgn = CreateRectRgn(0,0,0,0);
  44     BOOL empty;
  45
  46     TRACE("hdc=%p\n", physDev->hdc);
  47
  48     if(physDev->pathdepth) {
  49         TRACE("inside a path, so not clipping\n");
  50         goto end;
  51     }
  52
  53     empty = !GetClipRgn(physDev->hdc, hrgn);
  54
  55     if(!empty) {
  56         size = GetRegionData(hrgn, 0, NULL);
  57         if(!size) {
  58             ERR("Invalid region\n");
  59             goto end;
  60         }
  61
  62         rgndata = HeapAlloc( GetProcessHeap(), 0, size );
  63         if(!rgndata) {
  64             ERR("Can't allocate buffer\n");
  65             goto end;
  66         }
  67
  68         GetRegionData(hrgn, size, rgndata);
  69
  70         PSDRV_WriteGSave(physDev);
  71
  72         /* check for NULL region */
  73         if (rgndata->rdh.nCount == 0)
  74         {
  75             /* set an empty clip path. */
  76             PSDRV_WriteRectClip(physDev, 0, 0, 0, 0);
  77         }
  78         /* optimize when it is a simple region */
  79         else if (rgndata->rdh.nCount == 1)
  80         {
  81             RECT *pRect = (RECT *)rgndata->Buffer;
  82
  83             PSDRV_WriteRectClip(physDev, pRect->left, pRect->top,
  84                                 pRect->right - pRect->left,
  85                                 pRect->bottom - pRect->top);
  86         }
  87         else
  88         {
  89             UINT i;
  90             RECT *pRect = (RECT *)rgndata->Buffer;
  91
  92             PSDRV_WriteArrayDef(physDev, szArrayName, rgndata->rdh.nCount * 4);
  93
  94             for (i = 0; i < rgndata->rdh.nCount; i++, pRect++)
  95             {
  96                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4,
  97                                     pRect->left);
  98                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 1,
  99                                     pRect->top);
 100                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 2,
 101                                     pRect->right - pRect->left);
 102                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 3,
 103                                     pRect->bottom - pRect->top);
 104             }
 105             PSDRV_WriteRectClip2(physDev, szArrayName);
 106         }
 107     }
 108 end:
 109     HeapFree( GetProcessHeap(), 0, rgndata );
 110     DeleteObject(hrgn);
 111 }
 112
 113
 114 /***********************************************************************
 115  *           PSDRV_ResetClip
 116  */
 117 void PSDRV_ResetClip( PSDRV_PDEVICE *physDev )
 118 {
 119     HRGN hrgn = CreateRectRgn(0,0,0,0);
 120     BOOL empty;
 121
 122     empty = !GetClipRgn(physDev->hdc, hrgn);
 123     if(!empty && !physDev->pathdepth)
 124         PSDRV_WriteGRestore(physDev);
 125     DeleteObject(hrgn);
 126 }