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     X11DRV_PDEVICE *physDev = (X11DRV_PDEVICE *)dc->physDev;
  25
  26     RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
  27     if (!obj)
  28     {
  29         ERR(x11drv, "Rgn is 0. Please report this.\n");
  30         return;
  31     }
  32
  33     if (obj->rgn->numRects > 0)
  34     {
  35         XRectangle *pXr;
  36         RECT32 *pRect = obj->rgn->rects;
  37         RECT32 *pEndRect = obj->rgn->rects + obj->rgn->numRects;
  38
  39         pXrect = HeapAlloc( GetProcessHeap(), 0,
  40                             sizeof(*pXrect) * obj->rgn->numRects );
  41         if(!pXrect)
  42         {
  43             WARN(x11drv, "Can't alloc buffer\n");
  44             return;
  45         }
  46
  47         for(pXr = pXrect; pRect < pEndRect; pRect++, pXr++)
  48         {
  49             pXr->x = pRect->left;
  50             pXr->y = pRect->top;
  51             pXr->width = pRect->right - pRect->left;
  52             pXr->height = pRect->bottom - pRect->top;
  53         }
  54     }
  55     else
  56         pXrect = NULL;
  57
  58     TSXSetClipRectangles( display, physDev->gc, 0, 0,
  59                           pXrect, obj->rgn->numRects, YXBanded );
  60
  61     if(pXrect)
  62         HeapFree( GetProcessHeap(), 0, pXrect );
  63
  64     GDI_HEAP_UNLOCK( dc->w.hGCClipRgn );
  65 }