dlls/x11drv/clipping.c

   1 /*
   2  * X11DRV clipping functions
   3  *
   4  * Copyright 1998 Huw Davies
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24
  25 #include "x11drv.h"
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(x11drv);
  29
  30 /***********************************************************************
  31  *           X11DRV_GetRegionData
  32  *
  33  * Calls GetRegionData on the given region and converts the rectangle
  34  * array to XRectangle format. The returned buffer must be freed by
  35  * caller using HeapFree(GetProcessHeap(),...).
  36  * If hdc_lptodp is not 0, the rectangles are converted through LPtoDP.
  37  */
  38 RGNDATA *X11DRV_GetRegionData( HRGN hrgn, HDC hdc_lptodp )
  39 {
  40     RGNDATA *data;
  41     DWORD size;
  42     unsigned int i;
  43     RECT *rect, tmp;
  44     XRectangle *xrect;
  45
  46     if (!(size = GetRegionData( hrgn, 0, NULL ))) return NULL;
  47     if (sizeof(XRectangle) > sizeof(RECT))
  48     {
  49         /* add extra size for XRectangle array */
  50         int count = (size - sizeof(RGNDATAHEADER)) / sizeof(RECT);
  51         size += count * (sizeof(XRectangle) - sizeof(RECT));
  52     }
  53     if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return NULL;
  54     if (!GetRegionData( hrgn, size, data ))
  55     {
  56         HeapFree( GetProcessHeap(), 0, data );
  57         return NULL;
  58     }
  59
  60     rect = (RECT *)data->Buffer;
  61     xrect = (XRectangle *)data->Buffer;
  62     if (hdc_lptodp)  /* map to device coordinates */
  63     {
  64         LPtoDP( hdc_lptodp, (POINT *)rect, data->rdh.nCount * 2 );
  65         for (i = 0; i < data->rdh.nCount; i++)
  66         {
  67             if (rect[i].right < rect[i].left)
  68             {
  69                 INT tmp = rect[i].right;
  70                 rect[i].right = rect[i].left;
  71                 rect[i].left = tmp;
  72             }
  73             if (rect[i].bottom < rect[i].top)
  74             {
  75                 INT tmp = rect[i].bottom;
  76                 rect[i].bottom = rect[i].top;
  77                 rect[i].top = tmp;
  78             }
  79         }
  80     }
  81
  82     if (sizeof(XRectangle) > sizeof(RECT))
  83     {
  84         int j;
  85         /* need to start from the end */
  86         for (j = data->rdh.nCount-1; j >= 0; j--)
  87         {
  88             tmp = rect[j];
  89             xrect[j].x      = tmp.left;
  90             xrect[j].y      = tmp.top;
  91             xrect[j].width  = tmp.right - tmp.left;
  92             xrect[j].height = tmp.bottom - tmp.top;
  93         }
  94     }
  95     else
  96     {
  97         for (i = 0; i < data->rdh.nCount; i++)
  98         {
  99             tmp = rect[i];
 100             xrect[i].x      = tmp.left;
 101             xrect[i].y      = tmp.top;
 102             xrect[i].width  = tmp.right - tmp.left;
 103             xrect[i].height = tmp.bottom - tmp.top;
 104         }
 105     }
 106     return data;
 107 }
 108
 109
 110 /***********************************************************************
 111  *           X11DRV_SetDeviceClipping
 112  */
 113 void X11DRV_SetDeviceClipping( X11DRV_PDEVICE *physDev, HRGN vis_rgn, HRGN clip_rgn )
 114 {
 115     RGNDATA *data;
 116
 117     CombineRgn( physDev->region, vis_rgn, clip_rgn, clip_rgn ? RGN_AND : RGN_COPY );
 118     if (!(data = X11DRV_GetRegionData( physDev->region, 0 ))) return;
 119
 120     wine_tsx11_lock();
 121     XSetClipRectangles( gdi_display, physDev->gc, physDev->org.x, physDev->org.y,
 122                         (XRectangle *)data->Buffer, data->rdh.nCount, YXBanded );
 123     wine_tsx11_unlock();
 124     HeapFree( GetProcessHeap(), 0, data );
 125 }