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wsamovie.cpp

/* ScummVM - Scumm Interpreter
 * 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/kyra/wsamovie.cpp $
 * $Id: wsamovie.cpp 22716 2006-05-28 12:19:45Z lordhoto $
 *
 */

#include "common/stdafx.h"
#include "common/endian.h"
#include "kyra/kyra.h"
#include "kyra/screen.h"
#include "kyra/wsamovie.h"


namespace Kyra {
WSAMovieV1::WSAMovieV1(KyraEngine *vm) : Movie(vm) {}
WSAMovieV1::~WSAMovieV1() { close(); }

void WSAMovieV1::open(const char *filename, int offscreenDecode, uint8 *palBuf) {
      debugC(9, kDebugLevelMovie, "WSAMovieV1::open('%s', %d, %p)", filename, offscreenDecode, (const void *)palBuf);
      close();

      uint32 flags = 0;
      uint32 fileSize;
      uint8 *p = _vm->resource()->fileData(filename, &fileSize);
      if (!p)
            return;
      
      const uint8 *wsaData = p;
      _numFrames = READ_LE_UINT16(wsaData); wsaData += 2;
      _width = READ_LE_UINT16(wsaData); wsaData += 2;
      _height = READ_LE_UINT16(wsaData); wsaData += 2;
      _deltaBufferSize = READ_LE_UINT16(wsaData); wsaData += 2;
      _offscreenBuffer = NULL;
      _flags = 0;
      if (_vm->features() & GF_TALKIE) {
            flags = READ_LE_UINT16(wsaData); wsaData += 2;
      }
      
      uint32 offsPal = 0;
      if (flags & 1) {
            offsPal = 0x300;
            _flags |= WF_HAS_PALETTE;
            if (palBuf) {
                  memcpy(palBuf, wsaData + (_numFrames + 2) * 4, 0x300);
            }
      }
      
      if (offscreenDecode) {
            _flags |= WF_OFFSCREEN_DECODE;
            const int offscreenBufferSize = _width * _height;
            _offscreenBuffer = new uint8[offscreenBufferSize];
            memset(_offscreenBuffer, 0, offscreenBufferSize);
      }

      if (_numFrames & 0x8000) {
            warning("Unhandled wsa flags 0x80");
            _flags |= 0x80;
            _numFrames &= 0x7FFF;
      }
      _currentFrame = _numFrames;

      _deltaBuffer = new uint8[_deltaBufferSize];
      memset(_deltaBuffer, 0, _deltaBufferSize);
      
      // read frame offsets
      _frameOffsTable = new uint32[_numFrames + 2];
      _frameOffsTable[0] = 0;
      uint32 frameDataOffs = READ_LE_UINT32(wsaData); wsaData += 4;
      bool firstFrame = true;
      if (frameDataOffs == 0) {
            firstFrame = false;
            frameDataOffs = READ_LE_UINT32(wsaData);
            _flags |= WF_NO_FIRST_FRAME;
      }
      for (int i = 1; i < _numFrames + 2; ++i) {
            _frameOffsTable[i] = READ_LE_UINT32(wsaData) - frameDataOffs;
            wsaData += 4;
      }
      
      // skip palette
      wsaData += offsPal;
      
      // read frame data
      const int frameDataSize = p + fileSize - wsaData;
      _frameData = new uint8[frameDataSize];
      memcpy(_frameData, wsaData, frameDataSize);
      
      // decode first frame
      if (firstFrame) {
            Screen::decodeFrame4(_frameData, _deltaBuffer, _deltaBufferSize);
      }
      
      delete [] p;
      _opened = true;
}

void WSAMovieV1::close() {
      debugC(9, kDebugLevelMovie, "WSAMovieV1::close()");
      if (_opened) {
            delete [] _deltaBuffer;
            delete [] _offscreenBuffer;
            delete [] _frameOffsTable;
            delete [] _frameData;
            _opened = false;
      }
}

void WSAMovieV1::displayFrame(int frameNum) {
      debugC(9, kDebugLevelMovie, "WSAMovieV1::displayFrame(%d)", frameNum);
      if (frameNum >= _numFrames || !_opened)
            return;

      uint8 *dst;
      if (_flags & WF_OFFSCREEN_DECODE) {
            dst = _offscreenBuffer;
      } else {
            dst = _vm->screen()->getPageRect(_drawPage, _x, _y, _width, _height);
      }
            
      if (_currentFrame == _numFrames) {
            if (!(_flags & WF_NO_FIRST_FRAME)) {
                  if (_flags & WF_OFFSCREEN_DECODE) {
                        Screen::decodeFrameDelta(dst, _deltaBuffer);
                  } else {
                        Screen::decodeFrameDeltaPage(dst, _deltaBuffer, _width, 1);
                  }
            }
            _currentFrame = 0;
      }

      // try to reduce the number of needed frame operations
      int diffCount = ABS(_currentFrame - frameNum);
      int frameStep = 1;
      int frameCount;
      if (_currentFrame < frameNum) {
            frameCount = _numFrames - frameNum + _currentFrame;
            if (diffCount > frameCount) {
                  frameStep = -1;
            } else {
                  frameCount = diffCount;
            }
      } else {
            frameCount = _numFrames - _currentFrame + frameNum;
            if (frameCount >= diffCount) {
                  frameStep = -1;
                  frameCount = diffCount;
            }
      }
      
      // process
      if (frameStep > 0) {
            uint16 cf = _currentFrame;
            while (frameCount--) {
                  cf += frameStep;
                  processFrame(cf, dst);
                  if (cf == _numFrames) {
                        cf = 0;
                  }
            }
      } else {
            uint16 cf = _currentFrame;
            while (frameCount--) {
                  if (cf == 0) {
                        cf = _numFrames;
                  }
                  processFrame(cf, dst);
                  cf += frameStep;
            }
      }
      
      // display
      _currentFrame = frameNum;
      if (_flags & WF_OFFSCREEN_DECODE) {
            _vm->screen()->copyBlockToPage(_drawPage, _x, _y, _width, _height, _offscreenBuffer);
      }
}

void WSAMovieV1::processFrame(int frameNum, uint8 *dst) {
      debugC(9, kDebugLevelMovie, "WSAMovieV1::processFrame(%d, %p)", frameNum, (const void *)dst);
      if (!_opened)
            return;
      assert(frameNum <= _numFrames);
      const uint8 *src = _frameData + _frameOffsTable[frameNum];
      Screen::decodeFrame4(src, _deltaBuffer, _deltaBufferSize);
      if (_flags & WF_OFFSCREEN_DECODE) {
            Screen::decodeFrameDelta(dst, _deltaBuffer);
      } else {
            Screen::decodeFrameDeltaPage(dst, _deltaBuffer, _width, 0);
      }
}

#pragma mark -

WSAMovieV3::WSAMovieV3(KyraEngine_v3 *vm) : WSAMovieV1(vm), _vm3(vm), _xAdd(0), _yAdd(0) {}

void WSAMovieV3::open(const char *filename, int unk1, uint8 *palBuf) {
      debugC(9, kDebugLevelMovie, "WSAMovieV3::open('%s', %d, %p)", filename, unk1, (const void *)palBuf);
      close();

      uint32 flags = 0;
      uint32 fileSize;
      uint8 *p = _vm->resource()->fileData(filename, &fileSize);
      if (!p) {
            warning("couldn't load wsa file: '%s'", filename);
            return;
      }
      
      const uint8 *wsaData = p;
      _numFrames = READ_LE_UINT16(wsaData); wsaData += 2;
      _xAdd = (int16)(READ_LE_UINT16(wsaData)); wsaData += 2;
      _yAdd = (int16)(READ_LE_UINT16(wsaData)); wsaData += 2;
      _width = READ_LE_UINT16(wsaData); wsaData += 2;
      _height = READ_LE_UINT16(wsaData); wsaData += 2;
      _deltaBufferSize = READ_LE_UINT16(wsaData); wsaData += 2;
      _offscreenBuffer = NULL;
      _flags = 0;
      flags = READ_LE_UINT16(wsaData); wsaData += 2;
      
      uint32 offsPal = 0;
      if (flags & 1) {
            offsPal = 0x300;
            _flags |= WF_HAS_PALETTE;
            if (palBuf) {
                  memcpy(palBuf, wsaData + 8 + ((_numFrames << 2) & 0xFFFF), 0x300);
            }
      }
      
      if (!(unk1 & 2)) {
            _flags |= WF_OFFSCREEN_DECODE;
            const int offscreenBufferSize = _width * _height;
            _offscreenBuffer = new uint8[offscreenBufferSize];
            memset(_offscreenBuffer, 0, offscreenBufferSize);
      }

      if (_numFrames & 0x8000) {
            warning("Unhandled wsa flags 0x80");
            _flags |= 0x80;
            _numFrames &= 0x7FFF;
      }
      _currentFrame = _numFrames;

      _deltaBuffer = new uint8[_deltaBufferSize];
      memset(_deltaBuffer, 0, _deltaBufferSize);
      
      // read frame offsets
      _frameOffsTable = new uint32[_numFrames + 2];
      _frameOffsTable[0] = 0;
      uint32 frameDataOffs = READ_LE_UINT32(wsaData); wsaData += 4;
      for (int i = 1; i < _numFrames + 2; ++i) {
            _frameOffsTable[i] = READ_LE_UINT32(wsaData) - frameDataOffs;
            wsaData += 4;
      }
      
      // skip palette
      wsaData += offsPal;
      
      // read frame data
      const int frameDataSize = p + fileSize - wsaData;
      _frameData = new uint8[frameDataSize];
      memcpy(_frameData, wsaData, frameDataSize);
      
      // decode first frame
      Screen::decodeFrame4(_frameData, _deltaBuffer, _deltaBufferSize);
      
      delete [] p;
      _opened = true;
}

} // end of namespace Kyra

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