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animseq.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2005-2006 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/lure/animseq.cpp $
 * $Id: animseq.cpp 21500 2006-03-29 15:59:37Z fingolfin $
 *
 */

#include "lure/animseq.h"
#include "lure/palette.h"
#include "lure/decode.h"
#include "lure/events.h"
#include "common/endian.h"

namespace Lure {

// delay
// Delays for a given number of milliseconds. If it returns true, it indicates that
// Escape has been pressed, and the introduction should be aborted.

AnimAbortType AnimationSequence::delay(uint32 milliseconds) {
      uint32 delayCtr = _system.getMillis() + milliseconds;
      Events &events = Events::getReference();

      while (_system.getMillis() < delayCtr) {
            while (events.pollEvent()) {
                  if (events.type() == OSystem::EVENT_KEYDOWN) {
                        if (events.event().kbd.keycode == 27) return ABORT_END_INTRO;
                        else return ABORT_NEXT_SCENE;
                  } else if (events.type() == OSystem::EVENT_LBUTTONDOWN)
                        return ABORT_NEXT_SCENE;
                  else if (events.type() == OSystem::EVENT_QUIT) 
                        return ABORT_END_INTRO;
            }

            uint32 delayAmount = delayCtr - _system.getMillis();
            if (delayAmount > 10) delayAmount = 10;
            _system.delayMillis(delayAmount);
      }
      return ABORT_NONE;
}

// decodeFrame
// Decodes a single frame of the animation sequence

void AnimationSequence::decodeFrame(byte *&pPixels, byte *&pLines) {
      byte *screen = _screen.screen_raw();   
      uint16 screenPos = 0;
      uint16 len;

      while (screenPos < SCREEN_SIZE) {
            // Get line length
            len = (uint16) *pLines++;
            if (len == 0) {
                  len = READ_LE_UINT16(pLines);
                  pLines += 2;
            }
      
            // Move the splice over
            memcpy(screen, pPixels, len);
            screen += len;
            screenPos += len;
            pPixels += len;

            // Get the offset inc amount
            len = (uint16) *pLines++;
            if (len == 0) {
                  len = READ_LE_UINT16(pLines);
                  pLines += 2;
            }

            screen += len;
            screenPos += len;
      }

      // Make the decoded frame visible
      _screen.update();
}

AnimationSequence::AnimationSequence(Screen &screen, OSystem &system, uint16 screenId, Palette &palette, 
                               bool fadeIn): _screen(screen), _system(system), _screenId(screenId), _palette(palette) {
      PictureDecoder decoder;
      Disk &d = Disk::getReference();
      MemoryBlock *data = d.getEntry(_screenId);
      _decodedData = decoder.decode(data, MAX_ANIM_DECODER_BUFFER_SIZE);
      delete data;

      _lineRefs = d.getEntry(_screenId + 1);

      // Show the screen that preceeds the start of the animation data
      _screen.setPaletteEmpty();
      _screen.screen().data().copyFrom(_decodedData, 0, 0, FULL_SCREEN_HEIGHT * FULL_SCREEN_WIDTH);
      _screen.update();

      // Set the palette
      if (fadeIn) _screen.paletteFadeIn(&_palette);
      else _screen.setPalette(&_palette);

      // Set up frame poitners
      _pPixels = _decodedData->data() + SCREEN_SIZE;
      _pLines = _lineRefs->data();
      _pPixelsEnd = _decodedData->data() + _decodedData->size() - 1;
      _pLinesEnd = _lineRefs->data() + _lineRefs->size() - 1;
}

AnimationSequence::~AnimationSequence() {
      delete _lineRefs;
      delete _decodedData;
}

// show
// Main method for displaying the animation

AnimAbortType AnimationSequence::show() {
      AnimAbortType result;

      // Loop through displaying the animations
      while ((_pPixels < _pPixelsEnd) && (_pLines < _pLinesEnd)) {
            decodeFrame(_pPixels, _pLines);

            result = delay(130);
            if (result != ABORT_NONE) return result;
      }

      return ABORT_NONE;
}

bool AnimationSequence::step() {
      if ((_pPixels >= _pPixelsEnd) || (_pLines >= _pLinesEnd)) return false;
      decodeFrame(_pPixels, _pLines);
      _screen.setPalette(&_palette);
      return true;
}

} // end of namespace Lure

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