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video_v2.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/video_v2.cpp $
 * $Id: video_v2.cpp 22917 2006-06-04 17:24:03Z drmccoy $
 *
 */

#include "common/stdafx.h"
#include "common/endian.h"

#include "gob/gob.h"
#include "gob/global.h"
#include "gob/video.h"
#include "gob/draw.h"

namespace Gob {

Video_v2::Video_v2(GobEngine *vm) : Video_v1(vm) {
}

//XXX: Use this function to update the screen for now.
//     This should be moved to a better location later on.
void Video_v2::waitRetrace(int16) {
      if (_vm->_draw->_frontSurface) {
            g_system->copyRectToScreen(_vm->_draw->_frontSurface->vidPtr, 320, 0, 0, 320, 200);
            g_system->updateScreen();
      }
}

void Video_v2::drawLetter(int16 item, int16 x, int16 y, FontDesc *fontDesc, int16 color1,
          int16 color2, int16 transp, SurfaceDesc *dest) {
      int16 videoMode;

      videoMode = dest->vidMode;

      // Is that needed at all? And what does it do anyway?
      char *dataPtr;
      int16 itemSize;
      int16 si; 
      int16 di;
      int16 dx;
      char *var_A;
      int16 var_10;
      if (fontDesc->endItem == 0) {
            itemSize = fontDesc->itemSize + 3;
            dataPtr = fontDesc->dataPtr;
            var_10 = dataPtr[-2] - 1;
            si = 0;
            do {
                  di = ((si + var_10) / 2) * itemSize;
                  var_A = fontDesc->dataPtr + di;
                  dx = (READ_LE_UINT16(var_A) & 0x7FFF);
                  if (item > dx)
                        var_10 = di - 1;
                  else
                        si = di + 1;
            } while ((dx != item) && (si <= var_10));
            if (dx != item)
                  return;
            fontDesc->dataPtr = var_A + 3;
            item = 0;
      }

      dest->vidMode &= 0x7F;
      _videoDriver->drawLetter((unsigned char) item, x, y, fontDesc, color1, color2, transp, dest);
      dest->vidMode = videoMode;
}

Video::SurfaceDesc *Video_v2::initSurfDesc(int16 vidMode, int16 width, int16 height, int16 flags) {
      int8 flagsAnd2;
      byte *vidMem = 0;
      int32 sprSize;
      int16 someFlags = 1;
      SurfaceDesc *descPtr;

      if (flags != PRIMARY_SURFACE)
            _vm->_global->_sprAllocated++;

      if (flags & RETURN_PRIMARY)
            return _vm->_draw->_frontSurface;

      if (vidMode != 0x13)
            error("Video::initSurfDesc: Only VGA 0x13 mode is supported!");

      if ((flags & PRIMARY_SURFACE) == 0)
            vidMode += 0x80;

      if (flags & 2)
            flagsAnd2 = 1;
      else
            flagsAnd2 = 0;

      width = (width + 7) & 0xFFF8;

      if (flags & PRIMARY_SURFACE) {
            _vm->_global->_primaryWidth = width;
            _vm->_global->_mouseMaxCol = width;
            _vm->_global->_primaryHeight = height;
            _vm->_global->_mouseMaxRow = height;
            sprSize = 0;
      } else {
            vidMem = 0;
            sprSize = Video::getRectSize(width, height, flagsAnd2, vidMode);
            someFlags = 4;
            if (flagsAnd2)
                  someFlags += 0x80;
      }
      if (flags & PRIMARY_SURFACE) {
            descPtr = _vm->_draw->_frontSurface;
            assert(descPtr);
            if (descPtr->vidPtr != 0)
                  delete[] descPtr->vidPtr;
            vidMem = new byte[320 * 200];
            memset(vidMem, 0, 64000);
      } else {
            if (flags & DISABLE_SPR_ALLOC) {
                  descPtr = new SurfaceDesc;
                  // this case causes vidPtr to be set to invalid memory
                  assert(false);
            } else {
                  descPtr = new SurfaceDesc;
                  descPtr->vidPtr = new byte[sprSize];
                  memset(descPtr->vidPtr, 0, sprSize);
                  vidMem = descPtr->vidPtr;
            }
      }
      if (descPtr == 0)
            return 0;

      descPtr->width = width;
      descPtr->height = height;
      descPtr->flag = someFlags;
      descPtr->vidMode = vidMode;
      descPtr->vidPtr = vidMem;

      descPtr->reserved1 = 0;
      descPtr->reserved2 = 0;
      return descPtr;
}

char Video_v2::spriteUncompressor(byte *sprBuf, int16 srcWidth, int16 srcHeight,
          int16 x, int16 y, int16 transp, SurfaceDesc *destDesc) {
      SurfaceDesc sourceDesc;
      byte *memBuffer;
      byte *srcPtr;
      byte *destPtr;
      byte *linePtr;
      byte temp;
      uint32 sourceLeft;
      int16 curWidth;
      int16 curHeight;
      int16 offset;
      int16 counter2;
      uint16 cmdVar;
      int16 bufPos;
      int16 strLen;

      if (!destDesc)
            return 1;

      if ((destDesc->vidMode & 0x7f) != 0x13)
            error("Video::spriteUncompressor: Video mode 0x%x is not supported!",
                destDesc->vidMode & 0x7f);

      if (sprBuf[0] != 1)
            return 0;

      if (sprBuf[1] != 2)
            return 0;

      if (sprBuf[2] == 2) {
            sourceDesc.width = srcWidth;
            sourceDesc.height = srcHeight;
            sourceDesc.vidMode = 0x93;
            sourceDesc.vidPtr = sprBuf + 3;
            Video::drawSprite(&sourceDesc, destDesc, 0, 0, srcWidth - 1,
                srcHeight - 1, x, y, transp);
            return 1;
      } else if (sprBuf[2] == 1) {
            memBuffer = new byte[4370];
            if (memBuffer == 0)
                  return 0;

            srcPtr = sprBuf + 3;
            sourceLeft = READ_LE_UINT32(srcPtr);

            // TODO: Needed until wide/scrolling surfaces are supported...
            if ((x + srcWidth) >= destDesc->width)
                  x = 0;
            if ((y + srcHeight) >= destDesc->height)
                  y = 0;

            destPtr = destDesc->vidPtr + destDesc->width * y + x;

            curWidth = 0;
            curHeight = 0;

            linePtr = destPtr;
            srcPtr += 4;

            int16 var_2E = 0;
            int16 var_2F;
            if ((READ_LE_UINT16(srcPtr + 2) == 0x5678) && (READ_LE_UINT16(srcPtr) != 0x1234)) {
                  srcPtr += 4;
                  bufPos = 273;
                  var_2F = 18;
            } else {
                  var_2F = 100;
                  bufPos = 4078;
            }
            if (transp == 0)
                  var_2E = 300;
            else
                  var_2E = 0;

            memset(memBuffer, 32, bufPos);

            cmdVar = 0;
            while (1) {
                  cmdVar >>= 1;
                  if ((cmdVar & 0x100) == 0) {
                        cmdVar = *srcPtr | 0xff00;
                        srcPtr++;
                  }
                  if ((cmdVar & 1) != 0) {
                        temp = *srcPtr++;
                        if (temp != var_2E)
                              *destPtr = temp;
                        destPtr++;
                        curWidth++;
                        if (curWidth >= srcWidth) {
                              curWidth = 0;
                              linePtr += destDesc->width;
                              destPtr = linePtr;
                              curHeight++;
                              if (curHeight >= srcHeight)
                                    break;
                        }
                        sourceLeft--;
                        memBuffer[bufPos] = temp;
                        bufPos++;
                        bufPos %= 4096;
                        if (sourceLeft == 0)
                              break;
                  } else {
                        offset = *srcPtr++;
                        offset |= (*srcPtr & 0xf0) << 4;
                        strLen = (*srcPtr & 0x0f) + 3;
                        *srcPtr++;
                        if (strLen == var_2F)
                              strLen = *srcPtr++ + 18;

                        for (counter2 = 0; counter2 < strLen;
                            counter2++) {
                              temp = memBuffer[(offset + counter2) % 4096];
                              if (temp != var_2E)
                                    *destPtr = temp;
                              destPtr++;

                              curWidth++;
                              if (curWidth >= srcWidth) {
                                    curWidth = 0;
                                    linePtr += destDesc->width;
                                    destPtr = linePtr;
                                    curHeight++;
                                    if (curHeight >= srcHeight) {
                                          delete[] memBuffer;
                                          return 1;
                                    }
                              }
                              memBuffer[bufPos] = temp;
                              bufPos++;
                              bufPos %= 4096;
                        }
                        // loc_1D4E4

                        if (strLen < (int32) sourceLeft)
                              sourceLeft--;
                        else {
                              delete[] memBuffer;
                              return 1;
                        }
                  }
            }
      } else
            return 0;

      delete[] memBuffer;
      return 1;
}

} // End of namespace Gob

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