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