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 vis_rgn, HRGN clip_rgn )
  31 {
  32     /* We could set a dirty flag here to speed up PSDRV_SetClip */
  33     return;
  34 }
  35
  36 /***********************************************************************
  37  *           PSDRV_SetClip
  38  *
  39  * The idea here is that every graphics operation should bracket
  40  * output in PSDRV_SetClip/ResetClip calls.  The clip path outside
  41  * these calls will be empty; the reason for this is that it is
  42  * impossible in PostScript to cleanly make the clip path larger than
  43  * the current one.  Also Photoshop assumes that despite having set a
  44  * small clip area in the printer dc that it can still write raw
  45  * PostScript to the driver and expect this code not to be clipped.
  46  */
  47 void PSDRV_SetClip( PSDRV_PDEVICE *physDev )
  48 {
  49     CHAR szArrayName[] = "clippath";
  50     DWORD size;
  51     RGNDATA *rgndata = NULL;
  52     HRGN hrgn = CreateRectRgn(0,0,0,0);
  53     BOOL empty;
  54
  55     TRACE("hdc=%p\n", physDev->hdc);
  56
  57     empty = !GetClipRgn(physDev->hdc, hrgn);
  58
  59     if(!empty) {
  60         size = GetRegionData(hrgn, 0, NULL);
  61         if(!size) {
  62             ERR("Invalid region\n");
  63             goto end;
  64         }
  65
  66         rgndata = HeapAlloc( GetProcessHeap(), 0, size );
  67         if(!rgndata) {
  68             ERR("Can't allocate buffer\n");
  69             goto end;
  70         }
  71
  72         GetRegionData(hrgn, size, rgndata);
  73
  74         PSDRV_WriteGSave(physDev);
  75
  76         /* check for NULL region */
  77         if (rgndata->rdh.nCount == 0)
  78         {
  79             /* set an empty clip path. */
  80             PSDRV_WriteRectClip(physDev, 0, 0, 0, 0);
  81         }
  82         /* optimize when it is a simple region */
  83         else if (rgndata->rdh.nCount == 1)
  84         {
  85             RECT *pRect = (RECT *)rgndata->Buffer;
  86
  87             PSDRV_WriteRectClip(physDev, pRect->left, pRect->top,
  88                                 pRect->right - pRect->left,
  89                                 pRect->bottom - pRect->top);
  90         }
  91         else
  92         {
  93             INT i;
  94             RECT *pRect = (RECT *)rgndata->Buffer;
  95
  96             PSDRV_WriteArrayDef(physDev, szArrayName, rgndata->rdh.nCount * 4);
  97
  98             for (i = 0; i < rgndata->rdh.nCount; i++, pRect++)
  99             {
 100                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4,
 101                                     pRect->left);
 102                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 1,
 103                                     pRect->top);
 104                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 2,
 105                                     pRect->right - pRect->left);
 106                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 3,
 107                                     pRect->bottom - pRect->top);
 108             }
 109             PSDRV_WriteRectClip2(physDev, szArrayName);
 110         }
 111     }
 112 end:
 113     if(rgndata) HeapFree( GetProcessHeap(), 0, rgndata );
 114     DeleteObject(hrgn);
 115 }
 116
 117
 118 /***********************************************************************
 119  *           PSDRV_ResetClip
 120  */
 121 void PSDRV_ResetClip( PSDRV_PDEVICE *physDev )
 122 {
 123     HRGN hrgn = CreateRectRgn(0,0,0,0);
 124     BOOL empty;
 125
 126      empty = !GetClipRgn(physDev->hdc, hrgn);
 127      if(!empty)
 128          PSDRV_WriteGRestore(physDev);
 129     DeleteObject(hrgn);
 130 }