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_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     if(physDev->pathdepth) {
  58         TRACE("inside a path, so not clipping\n");
  59         goto end;
  60     }
  61
  62     empty = !GetClipRgn(physDev->hdc, hrgn);
  63
  64     if(!empty) {
  65         size = GetRegionData(hrgn, 0, NULL);
  66         if(!size) {
  67             ERR("Invalid region\n");
  68             goto end;
  69         }
  70
  71         rgndata = HeapAlloc( GetProcessHeap(), 0, size );
  72         if(!rgndata) {
  73             ERR("Can't allocate buffer\n");
  74             goto end;
  75         }
  76
  77         GetRegionData(hrgn, size, rgndata);
  78
  79         PSDRV_WriteGSave(physDev);
  80
  81         /* check for NULL region */
  82         if (rgndata->rdh.nCount == 0)
  83         {
  84             /* set an empty clip path. */
  85             PSDRV_WriteRectClip(physDev, 0, 0, 0, 0);
  86         }
  87         /* optimize when it is a simple region */
  88         else if (rgndata->rdh.nCount == 1)
  89         {
  90             RECT *pRect = (RECT *)rgndata->Buffer;
  91
  92             PSDRV_WriteRectClip(physDev, pRect->left, pRect->top,
  93                                 pRect->right - pRect->left,
  94                                 pRect->bottom - pRect->top);
  95         }
  96         else
  97         {
  98             UINT i;
  99             RECT *pRect = (RECT *)rgndata->Buffer;
 100
 101             PSDRV_WriteArrayDef(physDev, szArrayName, rgndata->rdh.nCount * 4);
 102
 103             for (i = 0; i < rgndata->rdh.nCount; i++, pRect++)
 104             {
 105                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4,
 106                                     pRect->left);
 107                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 1,
 108                                     pRect->top);
 109                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 2,
 110                                     pRect->right - pRect->left);
 111                 PSDRV_WriteArrayPut(physDev, szArrayName, i * 4 + 3,
 112                                     pRect->bottom - pRect->top);
 113             }
 114             PSDRV_WriteRectClip2(physDev, szArrayName);
 115         }
 116     }
 117 end:
 118     HeapFree( GetProcessHeap(), 0, rgndata );
 119     DeleteObject(hrgn);
 120 }
 121
 122
 123 /***********************************************************************
 124  *           PSDRV_ResetClip
 125  */
 126 void PSDRV_ResetClip( PSDRV_PDEVICE *physDev )
 127 {
 128     HRGN hrgn = CreateRectRgn(0,0,0,0);
 129     BOOL empty;
 130
 131     empty = !GetClipRgn(physDev->hdc, hrgn);
 132     if(!empty && !physDev->pathdepth)
 133         PSDRV_WriteGRestore(physDev);
 134     DeleteObject(hrgn);
 135 }