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palmovl.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2004 The ScummVM project
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/backends/PalmOS/Src/palmovl.cpp,v 1.1 2004/05/25 14:14:20 chrilith Exp $
 *
 */
#include "stdafx.h"
#include "palm.h"

void OSystem_PALMOS::showOverlay() {
      // hide the mouse
      undraw_mouse();
      // save background
      byte *src = _offScreenP;
      byte *dst = _tmpBackupP;
      int h = _screenHeight;

      UInt32 offset = 0;
      do {
            DmWrite(dst, offset, src, _screenWidth);
            offset += _screenWidth;
            src += _offScreenPitch;
      } while (--h);    

      _overlayVisible = true;
      clearOverlay();
}

void OSystem_PALMOS::hideOverlay() {
      // hide the mouse
      undraw_mouse();

      _overlayVisible = false;
      copyRectToScreen(_tmpBackupP, _screenWidth, 0, 0, _screenWidth, _screenHeight);
}

void OSystem_PALMOS::clearOverlay() {
      if (!_overlayVisible)
            return;

      // hide the mouse
      undraw_mouse();
      // restore background
      DmWrite(_tmpScreenP, 0, _tmpBackupP, _screenWidth * _screenHeight);
}

void OSystem_PALMOS::grabOverlay(byte *buf, int pitch) {
      if (!_overlayVisible)
            return;

      // hide the mouse
      undraw_mouse();

      byte *src = _tmpScreenP;
      int h = _screenHeight;

      do {
            memcpy(buf, src, _screenWidth);
            src += _screenWidth;
            buf += pitch;
      } while (--h);
}

void OSystem_PALMOS::copyRectToOverlay(const byte *buf, int pitch, int x, int y, int w, int h) {
      if (!_overlayVisible)
            return;

      if (!_tmpScreenP)
            return;

      // Clip the coordinates
      if (x < 0) {
            w += x;
            buf -= x;
            x = 0;
      }

      if (y < 0) {
            h += y; buf -= y * pitch;
            y = 0;
      }

      if (w > _screenWidth - x)
            w = _screenWidth - x;

      if (h > _screenHeight - y)
            h = _screenHeight - y;

      if (w <= 0 || h <= 0)
            return;

      /* FIXME: undraw mouse only if the draw rect intersects with the mouse rect */
      if (_mouseDrawn) {
/*          RectangleType mouse = {_mouseCurState.x, _mouseCurState.y, _mouseCurState.w, _mouseCurState.h};
            RectangleType copy      = {x, y, w, h};
            RectangleType result;
            
            RctGetIntersection(&mouse, &copy, &result);
            
            if (result.extent.x !=0 && result.extent.y !=0)*/
                  undraw_mouse();
      }

      byte *dst = _tmpScreenP;
      int offset = y * _screenWidth + x;
      do {
            DmWrite(dst, offset, buf, w);
            offset += _screenWidth;
            buf += pitch;
      } while (--h);
}

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