graphics/x11drv/clipping.c

   1 /*
   2  * X11DRV clipping functions
   3  *
   4  * Copyright 1998 Huw Davies
   5  */
   6
   7 #include "config.h"
   8
   9 #include "ts_xlib.h"
  10
  11 #include <stdio.h>
  12
  13 #include "dc.h"
  14 #include "x11drv.h"
  15 #include "region.h"
  16 #include "debugtools.h"
  17 #include "heap.h"
  18 #include "local.h"
  19
  20 DEFAULT_DEBUG_CHANNEL(x11drv)
  21
  22 /***********************************************************************
  23  *           X11DRV_SetDeviceClipping
  24  *           Copy RECT32s to a temporary buffer of XRectangles and call
  25  *           TSXSetClipRectangles().
  26  *
  27  *           Could write using GetRegionData but this would be slower.
  28  */
  29 void X11DRV_SetDeviceClipping( DC * dc )
  30 {
  31     XRectangle *pXrect;
  32     X11DRV_PDEVICE *physDev = (X11DRV_PDEVICE *)dc->physDev;
  33
  34     RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
  35     if (!obj)
  36     {
  37         ERR("Rgn is 0. Please report this.\n");
  38         return;
  39     }
  40
  41     if (obj->rgn->numRects > 0)
  42     {
  43         XRectangle *pXr;
  44         RECT *pRect = obj->rgn->rects;
  45         RECT *pEndRect = obj->rgn->rects + obj->rgn->numRects;
  46
  47         pXrect = HeapAlloc( GetProcessHeap(), 0,
  48                             sizeof(*pXrect) * obj->rgn->numRects );
  49         if(!pXrect)
  50         {
  51             WARN("Can't alloc buffer\n");
  52             GDI_HEAP_UNLOCK( dc->w.hGCClipRgn );
  53             return;
  54         }
  55
  56         for(pXr = pXrect; pRect < pEndRect; pRect++, pXr++)
  57         {
  58             pXr->x = pRect->left;
  59             pXr->y = pRect->top;
  60             pXr->width = pRect->right - pRect->left;
  61             pXr->height = pRect->bottom - pRect->top;
  62         }
  63     }
  64     else
  65         pXrect = NULL;
  66
  67     TSXSetClipRectangles( display, physDev->gc, 0, 0,
  68                           pXrect, obj->rgn->numRects, YXBanded );
  69
  70     if(pXrect)
  71         HeapFree( GetProcessHeap(), 0, pXrect );
  72
  73     GDI_HEAP_UNLOCK( dc->w.hGCClipRgn );
  74 }
  75