dlls/winex11.drv/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdio.h>
  24
  25 #include "x11drv.h"
  26
  27 /***********************************************************************
  28  *           X11DRV_GetRegionData
  29  *
  30  * Calls GetRegionData on the given region and converts the rectangle
  31  * array to XRectangle format. The returned buffer must be freed by
  32  * caller using HeapFree(GetProcessHeap(),...).
  33  * If hdc_lptodp is not 0, the rectangles are converted through LPtoDP.
  34  */
  35 RGNDATA *X11DRV_GetRegionData( HRGN hrgn, HDC hdc_lptodp )
  36 {
  37     RGNDATA *data;
  38     DWORD size;
  39     unsigned int i;
  40     RECT *rect, tmp;
  41     XRectangle *xrect;
  42
  43     if (!(size = GetRegionData( hrgn, 0, NULL ))) return NULL;
  44     if (sizeof(XRectangle) > sizeof(RECT))
  45     {
  46         /* add extra size for XRectangle array */
  47         int count = (size - sizeof(RGNDATAHEADER)) / sizeof(RECT);
  48         size += count * (sizeof(XRectangle) - sizeof(RECT));
  49     }
  50     if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return NULL;
  51     if (!GetRegionData( hrgn, size, data ))
  52     {
  53         HeapFree( GetProcessHeap(), 0, data );
  54         return NULL;
  55     }
  56
  57     rect = (RECT *)data->Buffer;
  58     xrect = (XRectangle *)data->Buffer;
  59     if (hdc_lptodp)  /* map to device coordinates */
  60     {
  61         LPtoDP( hdc_lptodp, (POINT *)rect, data->rdh.nCount * 2 );
  62         for (i = 0; i < data->rdh.nCount; i++)
  63         {
  64             if (rect[i].right < rect[i].left)
  65             {
  66                 INT tmp = rect[i].right;
  67                 rect[i].right = rect[i].left;
  68                 rect[i].left = tmp;
  69             }
  70             if (rect[i].bottom < rect[i].top)
  71             {
  72                 INT tmp = rect[i].bottom;
  73                 rect[i].bottom = rect[i].top;
  74                 rect[i].top = tmp;
  75             }
  76         }
  77     }
  78
  79     if (sizeof(XRectangle) > sizeof(RECT))
  80     {
  81         int j;
  82         /* need to start from the end */
  83         for (j = data->rdh.nCount-1; j >= 0; j--)
  84         {
  85             tmp = rect[j];
  86             xrect[j].x      = tmp.left;
  87             xrect[j].y      = tmp.top;
  88             xrect[j].width  = tmp.right - tmp.left;
  89             xrect[j].height = tmp.bottom - tmp.top;
  90         }
  91     }
  92     else
  93     {
  94         for (i = 0; i < data->rdh.nCount; i++)
  95         {
  96             tmp = rect[i];
  97             xrect[i].x      = tmp.left;
  98             xrect[i].y      = tmp.top;
  99             xrect[i].width  = tmp.right - tmp.left;
 100             xrect[i].height = tmp.bottom - tmp.top;
 101         }
 102     }
 103     return data;
 104 }
 105
 106
 107 /***********************************************************************
 108  *           X11DRV_SetDeviceClipping
 109  */
 110 void X11DRV_SetDeviceClipping( X11DRV_PDEVICE *physDev, HRGN vis_rgn, HRGN clip_rgn )
 111 {
 112     RGNDATA *data;
 113
 114     CombineRgn( physDev->region, vis_rgn, clip_rgn, clip_rgn ? RGN_AND : RGN_COPY );
 115     if (!(data = X11DRV_GetRegionData( physDev->region, 0 ))) return;
 116
 117     wine_tsx11_lock();
 118     XSetClipRectangles( gdi_display, physDev->gc, physDev->dc_rect.left, physDev->dc_rect.top,
 119                         (XRectangle *)data->Buffer, data->rdh.nCount, YXBanded );
 120     wine_tsx11_unlock();
 121     HeapFree( GetProcessHeap(), 0, data );
 122 }