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palanim.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004 Ivan Dubrov
 * Copyright (C) 2004-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/gob/palanim.cpp $
 * $Id: palanim.cpp 20520 2006-02-11 10:11:37Z fingolfin $
 *
 */
#include "gob/gob.h"
#include "gob/video.h"
#include "gob/util.h"
#include "gob/global.h"
#include "gob/palanim.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;
      }
}

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

char PalAnim::fadeStep(int16 oper) {
      byte newRed;
      byte newGreen;
      byte newBlue;
      char stop;
      int16 i;

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

      if (oper == 0) {
            stop = 1;
            if (_vm->_global->_setAllPalette) {
                  if (_vm->_global->_inVM != 0)
                        error("fade: _vm->_global->_inVM != 0 not supported.");

                  for (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 = 0;
                        }
                  }
            } else {
                  for (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 = 0;
                  }
            }
            return stop;
      } else if (oper == 1) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  _vm->_video->setPalElem(i,
                      fadeColor(_vm->_global->_redPalette[i], _toFadeRed[i]),
                      _vm->_global->_greenPalette[i], _vm->_global->_bluePalette[i], -1, _vm->_global->_videoMode);

                  if (_vm->_global->_redPalette[i] != _toFadeRed[i])
                        stop = 0;
            }
            return stop;
      } else if (oper == 2) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  _vm->_video->setPalElem(i,
                      _vm->_global->_redPalette[i],
                      fadeColor(_vm->_global->_greenPalette[i], _toFadeGreen[i]),
                      _vm->_global->_bluePalette[i], -1, _vm->_global->_videoMode);

                  if (_vm->_global->_greenPalette[i] != _toFadeGreen[i])
                        stop = 0;
            }
            return stop;
      } else if (oper == 3) {
            stop = 1;
            for (i = 0; i < 16; i++) {
                  _vm->_video->setPalElem(i,
                      _vm->_global->_redPalette[i],
                      _vm->_global->_greenPalette[i],
                      fadeColor(_vm->_global->_bluePalette[i], _toFadeBlue[i]),
                      -1, _vm->_global->_videoMode);

                  if (_vm->_global->_bluePalette[i] != _toFadeBlue[i])
                        stop = 0;
            }
            return stop;
      }
      return 1;
}

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

      if (fadeV < 0)
            _fadeValue = -fadeV;
      else
            _fadeValue = 2;

      if (_vm->_global->_colorCount < 256) {
            if (palDesc != 0)
                  _vm->_video->setFullPalette(palDesc);
            return;
      }

      if (_vm->_global->_setAllPalette == 0) {
            if (palDesc == 0) {
                  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("fade: _vm->_global->_inVM != 0 is not supported");

            if (palDesc == 0) {
                  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 {
                  _vm->_video->waitRetrace(_vm->_global->_videoMode);

                  stop = fadeStep(0);

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

            if (palDesc != 0)
                  _vm->_video->setFullPalette(palDesc);
            else
                  _vm->_util->clearPalette();
      }

      if (allColors == 1) {
            do {
                  _vm->_video->waitRetrace(_vm->_global->_videoMode);
                  stop = fadeStep(1);
            } while (stop == 0);

            do {
                  _vm->_video->waitRetrace(_vm->_global->_videoMode);
                  stop = fadeStep(2);
            } while (stop == 0);

            do {
                  _vm->_video->waitRetrace(_vm->_global->_videoMode);
                  stop = fadeStep(3);
            } while (stop == 0);

            if (palDesc != 0)
                  _vm->_video->setFullPalette(palDesc);
            else
                  _vm->_util->clearPalette();
      }
}

}                       // End of namespace Gob

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