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/* 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.
*
* $URL$
* $Id$
*
*/
#include "common/archive.h"
#include "sci/gfx/seq_decoder.h"
#include "sci/gfx/gfx_resource.h"
#include "sci/gfx/gfx_tools.h"
namespace Sci {
SeqDecoder::~SeqDecoder() {
closeFile();
}
bool SeqDecoder::loadFile(Common::String fileName) {
closeFile();
_fileStream = SearchMan.createReadStreamForMember(fileName);
if (!_fileStream)
return false;
_frameCount = _fileStream->readUint16LE();
int paletteSize = _fileStream->readUint32LE();
byte *paletteData = new byte[paletteSize];
_fileStream->read(paletteData, paletteSize);
_palette = gfxr_read_pal11(-1, paletteData, paletteSize);
delete[] paletteData;
_currentFrame = 0;
return true;
}
void SeqDecoder::closeFile() {
if (!_fileStream)
return;
delete _fileStream;
_fileStream = 0;
delete _palette;
_palette = 0;
}
#define WRITE_TO_BUFFER(n) \
if (writeRow * width + writeCol + (n) > width * height) { \
warning("SEQ player: writing out of bounds, aborting"); \
return false; \
} \
if (litPos + (n) > litSize) { \
warning("SEQ player: reading out of bounds, aborting"); \
} \
memcpy(dest + writeRow * width + writeCol, litData + litPos, n);
bool SeqDecoder::decodeFrame(byte *rleData, int rleSize, byte *litData, int litSize, byte *dest, int width, int height, int colorKey) {
int writeRow = 0;
int writeCol = 0;
int litPos = 0;
int rlePos = 0;
memset(dest, colorKey, width * height);
while (rlePos < rleSize) {
int op = rleData[rlePos++];
if ((op & 0xc0) == 0xc0) {
op &= 0x3f;
if (op == 0) {
// Go to next line in target buffer
writeRow++;
writeCol = 0;
} else {
// Skip bytes on current line
writeCol += op;
}
} else if (op & 0x80) {
op &= 0x3f;
if (op == 0) {
// Copy remainder of current line
int rem = width - writeCol;
WRITE_TO_BUFFER(rem);
writeRow++;
writeCol = 0;
litPos += rem;
} else {
// Copy bytes
WRITE_TO_BUFFER(op);
writeCol += op;
litPos += op;
}
} else {
uint16 count = ((op & 7) << 8) | rleData[rlePos++];
switch (op >> 3) {
case 2:
// Skip bytes
writeCol += count;
break;
case 3:
// Copy bytes
WRITE_TO_BUFFER(count);
writeCol += count;
litPos += count;
break;
case 6: {
// Copy rows
if (count == 0)
count = height - writeRow;
for (int i = 0; i < count; i++) {
WRITE_TO_BUFFER(width);
litPos += width;
writeRow++;
}
break;
}
case 7:
// Skip rows
if (count == 0)
count = height - writeRow;
writeRow += count;
break;
default:
warning("Unsupported operation %i encountered", op >> 3);
return false;
}
}
}
return true;
}
gfx_pixmap_t *SeqDecoder::getFrame(bool &hasNext) {
int frameWidth = _fileStream->readUint16LE();
int frameHeight = _fileStream->readUint16LE();
int frameLeft = _fileStream->readUint16LE();
int frameTop = _fileStream->readUint16LE();
int colorKey = _fileStream->readByte();
int type = _fileStream->readByte();
_fileStream->seek(2, SEEK_CUR);
uint16 bytes = _fileStream->readUint16LE();
_fileStream->seek(2, SEEK_CUR);
uint16 rle_bytes = _fileStream->readUint16LE();
_fileStream->seek(6, SEEK_CUR);
uint32 offset = _fileStream->readUint32LE();
_fileStream->seek(offset);
gfx_pixmap_t *pixmap = gfx_new_pixmap(frameWidth, frameHeight, 0, 0, 0);
assert(pixmap);
gfx_pixmap_alloc_index_data(pixmap);
if (type == 0)
_fileStream->read(pixmap->index_data, bytes);
else {
byte *buf = new byte[bytes];
_fileStream->read(buf, bytes);
decodeFrame(buf, rle_bytes, buf + rle_bytes, bytes - rle_bytes, pixmap->index_data, frameWidth, frameHeight, colorKey);
}
pixmap->xoffset = frameLeft;
pixmap->yoffset = frameTop;
pixmap->color_key = colorKey;
pixmap->palette = _palette->getref();
hasNext = ++_currentFrame < _frameCount;
return pixmap;
}
} // End of namespace Sci
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