graphics/x11drv/clipping.c

   1 /*
   2  * X11DRV clipping functions
   3  *
   4  * Copyright 1998 Huw Davies
   5  */
   6
   7 #include <stdio.h>
   8 #include "dc.h"
   9 #include "x11drv.h"
  10 #include "region.h"
  11 #include "stddebug.h"
  12 #include "debug.h"
  13 #include "heap.h"
  14
  15 /***********************************************************************
  16  *           X11DRV_SetDeviceClipping
  17  *           Copy RECT32s to a temporary buffer of XRectangles and call
  18  *           TSXSetClipRectangles().
  19  *
  20  *           Could write using GetRegionData but this would be slower.
  21  */
  22 void X11DRV_SetDeviceClipping( DC * dc )
  23 {
  24     XRectangle *pXrect;
  25     RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
  26     if (!obj)
  27     {
  28         fprintf( stderr, "X11DRV_SetDeviceClipping: Rgn is 0. Please report this.\n");
  29         exit(1);
  30     }
  31
  32     if (obj->rgn->numRects > 0)
  33     {
  34         XRectangle *pXr;
  35         RECT32 *pRect = obj->rgn->rects;
  36         RECT32 *pEndRect = obj->rgn->rects + obj->rgn->numRects;
  37
  38         pXrect = HeapAlloc( GetProcessHeap(), 0,
  39                             sizeof(*pXrect) * obj->rgn->numRects );
  40         if(!pXrect)
  41         {
  42             fprintf(stderr, "X11DRV_SetDeviceClipping() can't alloc buffer\n");
  43             return;
  44         }
  45
  46         for(pXr = pXrect; pRect < pEndRect; pRect++, pXr++)
  47         {
  48             pXr->x = pRect->left;
  49             pXr->y = pRect->top;
  50             pXr->width = pRect->right - pRect->left;
  51             pXr->height = pRect->bottom - pRect->top;
  52         }
  53     }
  54     else
  55         pXrect = NULL;
  56
  57     TSXSetClipRectangles( display, dc->u.x.gc, dc->w.DCOrgX, dc->w.DCOrgY,
  58                 pXrect, obj->rgn->numRects, YXBanded );
  59
  60     if(pXrect)
  61         HeapFree( GetProcessHeap(), 0, pXrect );
  62
  63     GDI_HEAP_UNLOCK( dc->w.hGCClipRgn );
  64 }