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palmmos.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/palmmos.cpp,v 1.2 2004/09/12 13:07:15 chrilith Exp $
 *
 */
#include "stdafx.h"
#include "palm.h"


bool OSystem_PALMOS::showMouse(bool visible) {
      if (_mouseVisible == visible)
            return visible;
      
      bool last = _mouseVisible;
      _mouseVisible = visible;

      if (visible)
            draw_mouse();
      else
            undraw_mouse();

      return last;
}

void OSystem_PALMOS::warpMouse(int x, int y) {
      set_mouse_pos(x, y);
}

void OSystem_PALMOS::set_mouse_pos(int x, int y) {
      if (x != _mouseCurState.x || y != _mouseCurState.y) {
            _mouseCurState.x = x;
            _mouseCurState.y = y;
            undraw_mouse();
      }
}

void OSystem_PALMOS::setMouseCursor(const byte *buf, uint w, uint h, int hotspot_x, int hotspot_y, byte keycolor) {
      _mouseCurState.w = w;
      _mouseCurState.h = h;

      _mouseHotspotX = hotspot_x;
      _mouseHotspotY = hotspot_y;

      _mouseKeyColor = keycolor;

      if (_mouseDataP)
            free(_mouseDataP);

      _mouseDataP = (byte *)malloc(w * h);
      memcpy(_mouseDataP, buf, w * h);

      undraw_mouse();
}

void OSystem_PALMOS::draw_mouse() {
      if (_mouseDrawn || !_mouseVisible)
            return;

      _mouseCurState.y = _mouseCurState.y >= _screenHeight ? _screenHeight - 1 : _mouseCurState.y;

      int x = _mouseCurState.x - _mouseHotspotX;
      int y = _mouseCurState.y - _mouseHotspotY;
      int w = _mouseCurState.w;
      int h = _mouseCurState.h;
      byte color;
      byte *src = _mouseDataP;            // Image representing the mouse
      byte *bak = _mouseBackupP;          // Surface used to backup the area obscured by the mouse
      byte *dst;                                // Surface we are drawing into
      int width;

      // clip the mouse rect, and addjust the src pointer accordingly
      if (x < 0) {
            w += x;
            src -= x;
            x = 0;
      }
      if (y < 0) {
            h += y;
            src -= y * _mouseCurState.w;
            y = 0;
      }
      if (w > _screenWidth - x)
            w = _screenWidth - x;
      if (h > _screenHeight - y)
            h = _screenHeight - y;

      // Quick check to see if anything has to be drawn at all
      if (w <= 0 || h <= 0)
            return;

      // Store the bounding box so that undraw mouse can restore the area the
      // mouse currently covers to its original content.
      _mouseOldState.x = x;
      _mouseOldState.y = y;
      _mouseOldState.w = w;
      _mouseOldState.h = h;

      // Draw the mouse cursor; backup the covered area in "bak"
      if (!_overlayVisible) {
            dst = _offScreenP + y * _offScreenPitch + x;

            while (h > 0) {
                  width = w;
                  while (width > 0) {
                        *bak++ = *dst;
                        color = *src++;
                        if (color != _mouseKeyColor)  // transparent, don't draw
                              *dst = color;
                        dst++;
                        width--;
                  }
                  src += _mouseCurState.w - w;
                  bak += MAX_MOUSE_W - w;
                  dst += _offScreenPitch - w;
                  h--;
            }
      } else {
            int offset = y * _screenWidth + x;
            dst = _tmpScreenP;
            
            while (h > 0) {
                  width = w;
                  while (width > 0) {
                        *bak++ = *(dst + offset);
                        color = *src++;
                        if (color != _mouseKeyColor)  // transparent, don't draw
                              DmWrite(dst, offset, &color, 1);
                        offset++;
                        width--;
                  }
                  src += _mouseCurState.w - w;
                  bak += MAX_MOUSE_W - w;
                  offset += _screenWidth - w;
                  h--;
            }
      }

      // Finally, set the flag to indicate the mouse has been drawn
      _mouseDrawn = true;
}

void OSystem_PALMOS::undraw_mouse() {
      if (!_mouseDrawn)
            return;

      _mouseDrawn = false;

      byte *dst, *bak = _mouseBackupP;
      const int old_mouse_x = _mouseOldState.x;
      const int old_mouse_y = _mouseOldState.y;
      const int old_mouse_w = _mouseOldState.w;
      int old_mouse_h = _mouseOldState.h;

      // No need to do clipping here, since draw_mouse() did that already
      if (!_overlayVisible) {
            dst = _offScreenP + old_mouse_y * _offScreenPitch + old_mouse_x;
            do {
                  memcpy(dst, bak, old_mouse_w);
                  bak += MAX_MOUSE_W;
                  dst += _offScreenPitch;
            } while (--old_mouse_h);

      } else {
            int offset = old_mouse_y * _screenWidth + old_mouse_x;
            do {
                  DmWrite(_tmpScreenP, offset, bak, old_mouse_w);
                  bak += MAX_MOUSE_W;
                  offset += _screenWidth;
            } while (--old_mouse_h);
      }
}


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