graphics/psdrv/clipping.c

   1 /*
   2  *      PostScript clipping functions
   3  *
   4  *      Copyright 1999  Luc Tourangau
   5  *
   6  */
   7
   8 #include "gdi.h"
   9 #include "psdrv.h"
  10 #include "debugtools.h"
  11 #include "winbase.h"
  12
  13 DEFAULT_DEBUG_CHANNEL(psdrv)
  14
  15 /***********************************************************************
  16  *           PSDRV_SetDeviceClipping
  17  */
  18 VOID PSDRV_SetDeviceClipping( DC *dc )
  19 {
  20     CHAR szArrayName[] = "clippath";
  21     DWORD size;
  22     RGNDATA *rgndata;
  23
  24     TRACE("hdc=%04x\n", dc->hSelf);
  25
  26     if (dc->w.hGCClipRgn == 0) {
  27         ERR("Rgn is 0. Please report this.\n");
  28         return;
  29     }
  30
  31     size = GetRegionData(dc->w.hGCClipRgn, 0, NULL);
  32     if(!size) {
  33         ERR("Invalid region\n");
  34         return;
  35     }
  36
  37     rgndata = HeapAlloc( GetProcessHeap(), 0, size );
  38     if(!rgndata) {
  39         ERR("Can't allocate buffer\n");
  40         return;
  41     }
  42
  43     GetRegionData(dc->w.hGCClipRgn, size, rgndata);
  44
  45     PSDRV_WriteInitClip(dc);
  46
  47     /* check for NULL region */
  48     if (rgndata->rdh.nCount == 0)
  49     {
  50         /* set an empty clip path. */
  51         PSDRV_WriteRectClip(dc, 0, 0, 0, 0);
  52     }
  53     /* optimize when it is a simple region */
  54     else if (rgndata->rdh.nCount == 1)
  55     {
  56         RECT *pRect = (RECT *)rgndata->Buffer;
  57
  58         PSDRV_WriteRectClip(dc, pRect->left, pRect->top,
  59                             pRect->right - pRect->left,
  60                             pRect->bottom - pRect->top);
  61     }
  62     else
  63     {
  64         INT i;
  65         RECT *pRect = (RECT *)rgndata->Buffer;
  66
  67         PSDRV_WriteArrayDef(dc, szArrayName, rgndata->rdh.nCount * 4);
  68
  69         for (i = 0; i < rgndata->rdh.nCount; i++, pRect++)
  70         {
  71             PSDRV_WriteArrayPut(dc, szArrayName, i * 4,
  72                                 pRect->left);
  73             PSDRV_WriteArrayPut(dc, szArrayName, i * 4 + 1,
  74                                 pRect->top);
  75             PSDRV_WriteArrayPut(dc, szArrayName, i * 4 + 2,
  76                                 pRect->right - pRect->left);
  77             PSDRV_WriteArrayPut(dc, szArrayName, i * 4 + 3,
  78                                 pRect->bottom - pRect->top);
  79         }
  80
  81         PSDRV_WriteRectClip2(dc, szArrayName);
  82     }
  83
  84     HeapFree( GetProcessHeap(), 0, rgndata );
  85     return;
  86 }