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os5_mouse.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2006 The ScummVM project
 * Copyright (C) 2002-2006 Chris Apers - PalmOS Backend
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/backends/platform/PalmOS/Src/os5_mouse.cpp $
 * $Id: os5_mouse.cpp 24417 2006-10-21 18:36:35Z chrilith $
 *
 */

#include "be_os5.h"

void OSystem_PalmOS5::setCursorPalette(const byte *colors, uint start, uint num) {
      for(uint i = 0; i < num; i++) {
            _mousePal[i + start] = gfxMakeDisplayRGB(colors[0], colors[1], colors[2]);
            colors += 4;
      }
      
      _cursorPaletteDisabled = false;
}

void OSystem_PalmOS5::disableCursorPalette(bool disable) {
      _cursorPaletteDisabled = disable;
}

void OSystem_PalmOS5::setMouseCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor, int cursorTargetScale) {
      if (w == 0 || h == 0)
            return;

      _mouseCurState.w = w;
      _mouseCurState.h = h;

      _mouseHotspotX = hotspotX;
      _mouseHotspotY = hotspotY;

      _mouseKeyColor = keycolor;

      // copy new cursor
      byte *dst = _mouseDataP;
      memset(dst, MAX_MOUSE_W * MAX_MOUSE_H, keycolor);
      while (h--) {
            memcpy(dst, buf, w);
            dst += MAX_MOUSE_W;
            buf += w;
      }
}

void OSystem_PalmOS5::draw_mouse() {
      if (_mouseDrawn || !_mouseVisible)
            return;

      byte *src = _mouseDataP;            // Image representing the mouse
      byte color;
      int width;

      _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;

      int draw_x = x;
      int draw_y = y;

      // clip the mouse rect
      if (x < 0) {
            w += x;
            src -= x;
            x = 0;
      }
      if (y < 0) {
            h += y;
            src -= y * MAX_MOUSE_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;

      // 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;

      // Backup the covered area draw the mouse cursor
      if (_overlayVisible) {
            int16 *bak = (int16 *)_mouseBackupP;                  // Surface used to backup the area obscured by the mouse
            int16 *dst = _overlayP + y * _screenWidth + x;
            int16 *pal = _cursorPaletteDisabled ? _nativePal : _mousePal;

            do {
                  width = w;
                  do {
                        *bak++ = *dst;
                        color = *src++;
                        if (color != _mouseKeyColor)  // transparent, don't draw
                              *dst = pal[color];
                        dst++;
                  } while (--width);

                  src += MAX_MOUSE_W - w;
                  bak += MAX_MOUSE_W - w;
                  dst += _screenWidth - w;
            } while (--h);

      } else {
            byte *bak = _mouseBackupP;                                  // Surface used to backup the area obscured by the mouse
            byte *dst =_offScreenP + y * _screenWidth + x;  // Surface we are drawing into

            do {
                  width = w;
                  do {
                        *bak++ = *dst;
                        color = *src++;
                        if (color != _mouseKeyColor)  // transparent, don't draw
                              *dst = color;
                        dst++;
                  } while (--width);

                  src += MAX_MOUSE_W - w;
                  bak += MAX_MOUSE_W - w;
                  dst += _screenWidth - w;
            } while (--h);
      }

      _mouseDrawn = true;
}

void OSystem_PalmOS5::undraw_mouse() {
      if (!_mouseDrawn)
            return;

      int h = _mouseOldState.h;
      // No need to do clipping here, since draw_mouse() did that already
      if (_overlayVisible) {
            int16 *bak = (int16 *)_mouseBackupP;
            int16 *dst = _overlayP + _mouseOldState.y * _screenWidth + _mouseOldState.x;

            do {
                  memcpy(dst, bak, _mouseOldState.w * 2);
                  bak += MAX_MOUSE_W;
                  dst += _screenWidth;
            } while (--h);

      } else {
            byte *dst, *bak = _mouseBackupP;
            dst = _offScreenP + _mouseOldState.y * _screenWidth + _mouseOldState.x;
            
            do {
                  memcpy(dst, bak, _mouseOldState.w);
                  bak += MAX_MOUSE_W;
                  dst += _screenWidth;
            } while (--h);
      }

      _mouseDrawn = false;
}

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