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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/endian.h"
#include "common/stream.h"
#include "common/system.h"
#include "common/textconsole.h"
#include "graphics/surface.h"
#include "sci/video/seq_decoder.h"
namespace Sci {
enum seqPalTypes {
kSeqPalVariable = 0,
kSeqPalConstant = 1
};
enum seqFrameTypes {
kSeqFrameFull = 0,
kSeqFrameDiff = 1
};
SeqDecoder::SeqDecoder() {
_fileStream = 0;
_surface = 0;
_dirtyPalette = false;
}
SeqDecoder::~SeqDecoder() {
close();
}
bool SeqDecoder::loadStream(Common::SeekableReadStream *stream) {
close();
_fileStream = stream;
_surface = new Graphics::Surface();
_surface->create(SEQ_SCREEN_WIDTH, SEQ_SCREEN_HEIGHT, Graphics::PixelFormat::createFormatCLUT8());
_frameCount = _fileStream->readUint16LE();
// Set palette
int paletteChunkSize = _fileStream->readUint32LE();
readPaletteChunk(paletteChunkSize);
return true;
}
void SeqDecoder::readPaletteChunk(uint16 chunkSize) {
byte *paletteData = new byte[chunkSize];
_fileStream->read(paletteData, chunkSize);
// SCI1.1 palette
byte palFormat = paletteData[32];
uint16 palColorStart = READ_LE_UINT16(paletteData + 25);
uint16 palColorCount = READ_LE_UINT16(paletteData + 29);
int palOffset = 37;
memset(_palette, 0, 256 * 3);
for (uint16 colorNo = palColorStart; colorNo < palColorStart + palColorCount; colorNo++) {
if (palFormat == kSeqPalVariable)
palOffset++;
_palette[colorNo * 3 + 0] = paletteData[palOffset++];
_palette[colorNo * 3 + 1] = paletteData[palOffset++];
_palette[colorNo * 3 + 2] = paletteData[palOffset++];
}
_dirtyPalette = true;
delete[] paletteData;
}
void SeqDecoder::close() {
if (!_fileStream)
return;
_frameDelay = 0;
delete _fileStream;
_fileStream = 0;
_surface->free();
delete _surface;
_surface = 0;
reset();
}
const Graphics::Surface *SeqDecoder::decodeNextFrame() {
int16 frameWidth = _fileStream->readUint16LE();
int16 frameHeight = _fileStream->readUint16LE();
int16 frameLeft = _fileStream->readUint16LE();
int16 frameTop = _fileStream->readUint16LE();
byte colorKey = _fileStream->readByte();
byte frameType = _fileStream->readByte();
_fileStream->skip(2);
uint16 frameSize = _fileStream->readUint16LE();
_fileStream->skip(2);
uint16 rleSize = _fileStream->readUint16LE();
_fileStream->skip(6);
uint32 offset = _fileStream->readUint32LE();
_fileStream->seek(offset);
if (frameType == kSeqFrameFull) {
byte *dst = (byte *)_surface->pixels + frameTop * SEQ_SCREEN_WIDTH + frameLeft;
byte *linebuf = new byte[frameWidth];
do {
_fileStream->read(linebuf, frameWidth);
memcpy(dst, linebuf, frameWidth);
dst += SEQ_SCREEN_WIDTH;
} while (--frameHeight);
delete[] linebuf;
} else {
byte *buf = new byte[frameSize];
_fileStream->read(buf, frameSize);
decodeFrame(buf, rleSize, buf + rleSize, frameSize - rleSize, (byte *)_surface->pixels + SEQ_SCREEN_WIDTH * frameTop, frameLeft, frameWidth, frameHeight, colorKey);
delete[] buf;
}
if (_curFrame == -1)
_startTime = g_system->getMillis();
_curFrame++;
return _surface;
}
#define WRITE_TO_BUFFER(n) \
if (writeRow * SEQ_SCREEN_WIDTH + writeCol + (n) > SEQ_SCREEN_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 * SEQ_SCREEN_WIDTH + writeCol, litData + litPos, n);
bool SeqDecoder::decodeFrame(byte *rleData, int rleSize, byte *litData, int litSize, byte *dest, int left, int width, int height, int colorKey) {
int writeRow = 0;
int writeCol = left;
int litPos = 0;
int rlePos = 0;
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 = left;
} 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 - left);
WRITE_TO_BUFFER(rem);
writeRow++;
writeCol = left;
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;
}
} // End of namespace Sci
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