graphics/x11drv/clipping.c

   1 /*
   2  * X11DRV clipping functions
   3  *
   4  * Copyright 1998 Huw Davies
   5  */
   6
   7 #include "config.h"
   8
   9 #ifndef X_DISPLAY_MISSING
  10
  11 #include "ts_xlib.h"
  12
  13 #include <stdio.h>
  14 #include "dc.h"
  15 #include "x11drv.h"
  16 #include "region.h"
  17 #include "debug.h"
  18 #include "heap.h"
  19 #include "local.h"
  20
  21 DEFAULT_DEBUG_CHANNEL(x11drv)
  22
  23 /***********************************************************************
  24  *           X11DRV_SetDeviceClipping
  25  *           Copy RECT32s to a temporary buffer of XRectangles and call
  26  *           TSXSetClipRectangles().
  27  *
  28  *           Could write using GetRegionData but this would be slower.
  29  */
  30 void X11DRV_SetDeviceClipping( DC * dc )
  31 {
  32     XRectangle *pXrect;
  33     X11DRV_PDEVICE *physDev = (X11DRV_PDEVICE *)dc->physDev;
  34
  35     RGNOBJ *obj = (RGNOBJ *) GDI_GetObjPtr(dc->w.hGCClipRgn, REGION_MAGIC);
  36     if (!obj)
  37     {
  38         ERR(x11drv, "Rgn is 0. Please report this.\n");
  39         return;
  40     }
  41
  42     if (obj->rgn->numRects > 0)
  43     {
  44         XRectangle *pXr;
  45         RECT *pRect = obj->rgn->rects;
  46         RECT *pEndRect = obj->rgn->rects + obj->rgn->numRects;
  47
  48         pXrect = HeapAlloc( GetProcessHeap(), 0,
  49                             sizeof(*pXrect) * obj->rgn->numRects );
  50         if(!pXrect)
  51         {
  52             WARN(x11drv, "Can't alloc buffer\n");
  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
  76 #endif /* !defined(X_DISPLAY_MISSING) */
  77