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palanim.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/gob/palanim.cpp $
 * $Id: palanim.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#include "gob/gob.h"
#include "gob/palanim.h"
#include "gob/global.h"
#include "gob/util.h"
#include "gob/video.h"

namespace Gob {

PalAnim::PalAnim(GobEngine *vm) : _vm(vm) {
      _fadeValue = 1;
      for (int i = 0; i < 256; i++) {
            _toFadeRed[i] = 0;
            _toFadeGreen[i] = 0;
            _toFadeBlue[i] = 0;
      }

      _palArray[0] = _vm->_global->_redPalette;
      _palArray[1] = _vm->_global->_greenPalette;
      _palArray[2] = _vm->_global->_bluePalette;
      _fadeArray[0] = _toFadeRed;
      _fadeArray[1] = _toFadeGreen;
      _fadeArray[2] = _toFadeBlue;
}

char PalAnim::fadeColor(int16 from, int16 to) {
      if ((from - _fadeValue) > to)
            return from - _fadeValue;
      else if ((from + _fadeValue) < to)
            return from + _fadeValue;
      else return to;
}

bool PalAnim::fadeStepColor(int color) {
      bool stop = true;
      char colors[3];

      for (int i = 0; i < 16; i++) {
            colors[0] = _palArray[0][i];
            colors[1] = _palArray[1][i];
            colors[2] = _palArray[2][i];
            colors[color] = fadeColor(_palArray[color][i], _fadeArray[color][i]);

            _vm->_video->setPalElem(i, colors[0], colors[1], colors[2],
                        -1, _vm->_global->_videoMode);

            if (_palArray[color][i] != _fadeArray[color][i])
                  stop = false;
      }

      return stop;
}

bool PalAnim::fadeStep(int16 oper) {
      bool stop = true;
      byte newRed;
      byte newGreen;
      byte newBlue;

      if (_vm->_global->_colorCount != 256)
            error("PalAnim::fadeStep(): Only 256 color mode is supported!");

      if (oper == 0) {
            if (_vm->_global->_setAllPalette) {
                  if (_vm->_global->_inVM != 0)
                        error("PalAnim::fadeStep(): _vm->_global->_inVM != 0 not supported.");

                  for (int i = 0; i < 256; i++) {
                        newRed = fadeColor(_vm->_global->_redPalette[i], _toFadeRed[i]);
                        newGreen = fadeColor(_vm->_global->_greenPalette[i], _toFadeGreen[i]);
                        newBlue = fadeColor(_vm->_global->_bluePalette[i], _toFadeBlue[i]);

                        if ((_vm->_global->_redPalette[i] != newRed) ||
                            (_vm->_global->_greenPalette[i] != newGreen) ||
                            (_vm->_global->_bluePalette[i] != newBlue)) {

                              _vm->_video->setPalElem(i, newRed, newGreen, newBlue, 0, 0x13);

                              _vm->_global->_redPalette[i] = newRed;
                              _vm->_global->_greenPalette[i] = newGreen;
                              _vm->_global->_bluePalette[i] = newBlue;
                              stop = false;
                        }
                  }
            } else {
                  for (int i = 0; i < 16; i++) {

                        _vm->_video->setPalElem(i,
                                    fadeColor(_vm->_global->_redPalette[i], _toFadeRed[i]),
                                    fadeColor(_vm->_global->_greenPalette[i], _toFadeGreen[i]),
                                    fadeColor(_vm->_global->_bluePalette[i], _toFadeBlue[i]),
                                    -1, _vm->_global->_videoMode);

                        if ((_vm->_global->_redPalette[i] != _toFadeRed[i]) ||
                            (_vm->_global->_greenPalette[i] != _toFadeGreen[i]) ||
                            (_vm->_global->_bluePalette[i] != _toFadeBlue[i]))
                              stop = false;
                  }
            }
      } else if ((oper > 0) && (oper < 4))
            stop = fadeStepColor(oper - 1);

      return stop;
}

void PalAnim::fade(Video::PalDesc *palDesc, int16 fadeV, int16 allColors) {
      bool stop;
      int16 i;

      if (_vm->_quitRequested)
            return;

      _fadeValue = (fadeV < 0) ? -fadeV : 2;

      if (_vm->_global->_colorCount < 256) {
            if (palDesc)
                  _vm->_video->setFullPalette(palDesc);
            return;
      }

      if (!_vm->_global->_setAllPalette) {
            if (!palDesc) {
                  for (i = 0; i < 16; i++) {
                        _toFadeRed[i] = 0;
                        _toFadeGreen[i] = 0;
                        _toFadeBlue[i] = 0;
                  }
            } else {
                  for (i = 0; i < 16; i++) {
                        _toFadeRed[i] = palDesc->vgaPal[i].red;
                        _toFadeGreen[i] = palDesc->vgaPal[i].green;
                        _toFadeBlue[i] = palDesc->vgaPal[i].blue;
                  }
            }
      } else {
            if (_vm->_global->_inVM != 0)
                  error("PalAnim::fade(): _vm->_global->_inVM != 0 is not supported");

            if (!palDesc) {
                  for (i = 0; i < 256; i++) {
                        _toFadeRed[i] = 0;
                        _toFadeGreen[i] = 0;
                        _toFadeBlue[i] = 0;
                  }
            } else {
                  for (i = 0; i < 256; i++) {
                        _toFadeRed[i] = palDesc->vgaPal[i].red;
                        _toFadeGreen[i] = palDesc->vgaPal[i].green;
                        _toFadeBlue[i] = palDesc->vgaPal[i].blue;
                  }
            }
      }

      if (allColors == 0) {
            do {
                  stop = fadeStep(0);
                  _vm->_video->waitRetrace();

                  if (fadeV > 0)
                        _vm->_util->delay(fadeV);
            } while (!stop);

            if (palDesc)
                  _vm->_video->setFullPalette(palDesc);
            else
                  _vm->_util->clearPalette();
      }

      if (allColors == 1) {
            do {
                  _vm->_video->waitRetrace();
                  stop = fadeStep(1);
            } while (!stop);

            do {
                  _vm->_video->waitRetrace();
                  stop = fadeStep(2);
            } while (!stop);

            do {
                  _vm->_video->waitRetrace();
                  stop = fadeStep(3);
            } while (!stop);

            if (palDesc)
                  _vm->_video->setFullPalette(palDesc);
            else
                  _vm->_util->clearPalette();
      }
}

} // End of namespace Gob

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