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|
/* ScummVM - Scumm Interpreter
* Copyright (C) 2001/2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include <stdafx.h>
#include "codec37.h"
#include "chunck.h"
#include "blitter.h"
#include <assert.h>
#include <string.h> // for memset
bool Codec37Decoder::initSize(const Point & p, const Rect & r) {
if(r.width() != getRect().width() && r.height() != getRect().height()) {
if(
(r.width() != 320 || r.height() != 200) &&
(r.width() != 384 || r.height() != 242) &&
(r.width() != 640 || r.height() != 480)
)
return false;
Decoder::initSize(p, r);
clean();
int frame_size = getRect().width() * getRect().height();
_deltaSize = frame_size * 2 + DELTA_ADD * 4;
_deltaBuf = new unsigned char[_deltaSize];
if(_deltaBuf == 0) error("unable to allocate decoder buffer");
_deltaBufs[0] = _deltaBuf + DELTA_ADD;
_deltaBufs[1] = _deltaBuf + frame_size + DELTA_ADD * 3;
_offsetTable = new short[255];
if(_offsetTable == 0) error("unable to allocate decoder offset table");
_tableLastPitch = -1;
_tableLastIndex = -1;
return true;
}
return false;
}
Codec37Decoder::Codec37Decoder() {
_deltaSize = 0;
_deltaBuf = 0;
_deltaBufs[0] = 0;
_deltaBufs[1] = 0;
_curtable = 0;
_offsetTable = 0;
_tableLastPitch = -1;
_tableLastIndex = -1;
_prevSeqNb = 32768; // Some invalid number
}
void Codec37Decoder::clean() {
if(_offsetTable) {
delete []_offsetTable;
_offsetTable = 0;
_tableLastPitch = -1;
_tableLastIndex = -1;
}
if(_deltaBuf) {
delete []_deltaBuf;
_deltaSize = 0;
_deltaBuf = 0;
_deltaBufs[0] = 0;
_deltaBufs[1] = 0;
}
}
Codec37Decoder::~Codec37Decoder() {
clean();
}
void Codec37Decoder::maketable(int pitch, int index) {
static const char maketable_bytes[] = {
0, 0, 1, 0, 2, 0, 3, 0, 5, 0, 8, 0, 13, 0, 21, 0,
-1, 0, -2, 0, -3, 0, -5, 0, -8, 0, -13, 0, -17, 0, -21, 0,
0, 1, 1, 1, 2, 1, 3, 1, 5, 1, 8, 1, 13, 1, 21, 1,
-1, 1, -2, 1, -3, 1, -5, 1, -8, 1, -13, 1, -17, 1, -21, 1,
0, 2, 1, 2, 2, 2, 3, 2, 5, 2, 8, 2, 13, 2, 21, 2,
-1, 2, -2, 2, -3, 2, -5, 2, -8, 2, -13, 2, -17, 2, -21, 2,
0, 3, 1, 3, 2, 3, 3, 3, 5, 3, 8, 3, 13, 3, 21, 3,
-1, 3, -2, 3, -3, 3, -5, 3, -8, 3, -13, 3, -17, 3, -21, 3,
0, 5, 1, 5, 2, 5, 3, 5, 5, 5, 8, 5, 13, 5, 21, 5,
-1, 5, -2, 5, -3, 5, -5, 5, -8, 5, -13, 5, -17, 5, -21, 5,
0, 8, 1, 8, 2, 8, 3, 8, 5, 8, 8, 8, 13, 8, 21, 8,
-1, 8, -2, 8, -3, 8, -5, 8, -8, 8, -13, 8, -17, 8, -21, 8,
0, 13, 1, 13, 2, 13, 3, 13, 5, 13, 8, 13, 13, 13, 21, 13,
-1, 13, -2, 13, -3, 13, -5, 13, -8, 13, -13, 13, -17, 13, -21, 13,
0, 21, 1, 21, 2, 21, 3, 21, 5, 21, 8, 21, 13, 21, 21, 21,
-1, 21, -2, 21, -3, 21, -5, 21, -8, 21, -13, 21, -17, 21, -21, 21,
0, -1, 1, -1, 2, -1, 3, -1, 5, -1, 8, -1, 13, -1, 21, -1,
-1, -1, -2, -1, -3, -1, -5, -1, -8, -1, -13, -1, -17, -1, -21, -1,
0, -2, 1, -2, 2, -2, 3, -2, 5, -2, 8, -2, 13, -2, 21, -2,
-1, -2, -2, -2, -3, -2, -5, -2, -8, -2, -13, -2, -17, -2, -21, -2,
0, -3, 1, -3, 2, -3, 3, -3, 5, -3, 8, -3, 13, -3, 21, -3,
-1, -3, -2, -3, -3, -3, -5, -3, -8, -3, -13, -3, -17, -3, -21, -3,
0, -5, 1, -5, 2, -5, 3, -5, 5, -5, 8, -5, 13, -5, 21, -5,
-1, -5, -2, -5, -3, -5, -5, -5, -8, -5, -13, -5, -17, -5, -21, -5,
0, -8, 1, -8, 2, -8, 3, -8, 5, -8, 8, -8, 13, -8, 21, -8,
-1, -8, -2, -8, -3, -8, -5, -8, -8, -8, -13, -8, -17, -8, -21, -8,
0, -13, 1, -13, 2, -13, 3, -13, 5, -13, 8, -13, 13, -13, 21, -13,
-1, -13, -2, -13, -3, -13, -5, -13, -8, -13, -13, -13, -17, -13, -21, -13,
0, -17, 1, -17, 2, -17, 3, -17, 5, -17, 8, -17, 13, -17, 21, -17,
-1, -17, -2, -17, -3, -17, -5, -17, -8, -17, -13, -17, -17, -17, -21, -17,
0, -21, 1, -21, 2, -21, 3, -21, 5, -21, 8, -21, 13, -21, 21, -21,
-1, -21, -2, -21, -3, -21, -5, -21, -8, -21, -13, -21, -17, -21, 0, 0,
-8, -29, 8, -29, -18, -25, 17, -25, 0, -23, -6, -22, 6, -22, -13, -19,
12, -19, 0, -18, 25, -18, -25, -17, -5, -17, 5, -17, -10, -15, 10, -15,
0, -14, -4, -13, 4, -13, 19, -13, -19, -12, -8, -11, -2, -11, 0, -11,
2, -11, 8, -11, -15, -10, -4, -10, 4, -10, 15, -10, -6, -9, -1, -9,
1, -9, 6, -9, -29, -8, -11, -8, -8, -8, -3, -8, 3, -8, 8, -8,
11, -8, 29, -8, -5, -7, -2, -7, 0, -7, 2, -7, 5, -7, -22, -6,
-9, -6, -6, -6, -3, -6, -1, -6, 1, -6, 3, -6, 6, -6, 9, -6,
22, -6, -17, -5, -7, -5, -4, -5, -2, -5, 0, -5, 2, -5, 4, -5,
7, -5, 17, -5, -13, -4, -10, -4, -5, -4, -3, -4, -1, -4, 0, -4,
1, -4, 3, -4, 5, -4, 10, -4, 13, -4, -8, -3, -6, -3, -4, -3,
-3, -3, -2, -3, -1, -3, 0, -3, 1, -3, 2, -3, 4, -3, 6, -3,
8, -3, -11, -2, -7, -2, -5, -2, -3, -2, -2, -2, -1, -2, 0, -2,
1, -2, 2, -2, 3, -2, 5, -2, 7, -2, 11, -2, -9, -1, -6, -1,
-4, -1, -3, -1, -2, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1,
4, -1, 6, -1, 9, -1, -31, 0, -23, 0, -18, 0, -14, 0, -11, 0,
-7, 0, -5, 0, -4, 0, -3, 0, -2, 0, -1, 0, 0, -31, 1, 0,
2, 0, 3, 0, 4, 0, 5, 0, 7, 0, 11, 0, 14, 0, 18, 0,
23, 0, 31, 0, -9, 1, -6, 1, -4, 1, -3, 1, -2, 1, -1, 1,
0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 6, 1, 9, 1, -11, 2,
-7, 2, -5, 2, -3, 2, -2, 2, -1, 2, 0, 2, 1, 2, 2, 2,
3, 2, 5, 2, 7, 2, 11, 2, -8, 3, -6, 3, -4, 3, -2, 3,
-1, 3, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 6, 3, 8, 3,
-13, 4, -10, 4, -5, 4, -3, 4, -1, 4, 0, 4, 1, 4, 3, 4,
5, 4, 10, 4, 13, 4, -17, 5, -7, 5, -4, 5, -2, 5, 0, 5,
2, 5, 4, 5, 7, 5, 17, 5, -22, 6, -9, 6, -6, 6, -3, 6,
-1, 6, 1, 6, 3, 6, 6, 6, 9, 6, 22, 6, -5, 7, -2, 7,
0, 7, 2, 7, 5, 7, -29, 8, -11, 8, -8, 8, -3, 8, 3, 8,
8, 8, 11, 8, 29, 8, -6, 9, -1, 9, 1, 9, 6, 9, -15, 10,
-4, 10, 4, 10, 15, 10, -8, 11, -2, 11, 0, 11, 2, 11, 8, 11,
19, 12, -19, 13, -4, 13, 4, 13, 0, 14, -10, 15, 10, 15, -5, 17,
5, 17, 25, 17, -25, 18, 0, 18, -12, 19, 13, 19, -6, 22, 6, 22,
0, 23, -17, 25, 18, 25, -8, 29, 8, 29, 0, 31, 0, 0, -6, -22,
6, -22, -13, -19, 12, -19, 0, -18, -5, -17, 5, -17, -10, -15, 10, -15,
0, -14, -4, -13, 4, -13, 19, -13, -19, -12, -8, -11, -2, -11, 0, -11,
2, -11, 8, -11, -15, -10, -4, -10, 4, -10, 15, -10, -6, -9, -1, -9,
1, -9, 6, -9, -11, -8, -8, -8, -3, -8, 0, -8, 3, -8, 8, -8,
11, -8, -5, -7, -2, -7, 0, -7, 2, -7, 5, -7, -22, -6, -9, -6,
-6, -6, -3, -6, -1, -6, 1, -6, 3, -6, 6, -6, 9, -6, 22, -6,
-17, -5, -7, -5, -4, -5, -2, -5, -1, -5, 0, -5, 1, -5, 2, -5,
4, -5, 7, -5, 17, -5, -13, -4, -10, -4, -5, -4, -3, -4, -2, -4,
-1, -4, 0, -4, 1, -4, 2, -4, 3, -4, 5, -4, 10, -4, 13, -4,
-8, -3, -6, -3, -4, -3, -3, -3, -2, -3, -1, -3, 0, -3, 1, -3,
2, -3, 3, -3, 4, -3, 6, -3, 8, -3, -11, -2, -7, -2, -5, -2,
-4, -2, -3, -2, -2, -2, -1, -2, 0, -2, 1, -2, 2, -2, 3, -2,
4, -2, 5, -2, 7, -2, 11, -2, -9, -1, -6, -1, -5, -1, -4, -1,
-3, -1, -2, -1, -1, -1, 0, -1, 1, -1, 2, -1, 3, -1, 4, -1,
5, -1, 6, -1, 9, -1, -23, 0, -18, 0, -14, 0, -11, 0, -7, 0,
-5, 0, -4, 0, -3, 0, -2, 0, -1, 0, 0, -23, 1, 0, 2, 0,
3, 0, 4, 0, 5, 0, 7, 0, 11, 0, 14, 0, 18, 0, 23, 0,
-9, 1, -6, 1, -5, 1, -4, 1, -3, 1, -2, 1, -1, 1, 0, 1,
1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 9, 1, -11, 2,
-7, 2, -5, 2, -4, 2, -3, 2, -2, 2, -1, 2, 0, 2, 1, 2,
2, 2, 3, 2, 4, 2, 5, 2, 7, 2, 11, 2, -8, 3, -6, 3,
-4, 3, -3, 3, -2, 3, -1, 3, 0, 3, 1, 3, 2, 3, 3, 3,
4, 3, 6, 3, 8, 3, -13, 4, -10, 4, -5, 4, -3, 4, -2, 4,
-1, 4, 0, 4, 1, 4, 2, 4, 3, 4, 5, 4, 10, 4, 13, 4,
-17, 5, -7, 5, -4, 5, -2, 5, -1, 5, 0, 5, 1, 5, 2, 5,
4, 5, 7, 5, 17, 5, -22, 6, -9, 6, -6, 6, -3, 6, -1, 6,
1, 6, 3, 6, 6, 6, 9, 6, 22, 6, -5, 7, -2, 7, 0, 7,
2, 7, 5, 7, -11, 8, -8, 8, -3, 8, 0, 8, 3, 8, 8, 8,
11, 8, -6, 9, -1, 9, 1, 9, 6, 9, -15, 10, -4, 10, 4, 10,
15, 10, -8, 11, -2, 11, 0, 11, 2, 11, 8, 11, 19, 12, -19, 13,
-4, 13, 4, 13, 0, 14, -10, 15, 10, 15, -5, 17, 5, 17, 0, 18,
-12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
};
if (_tableLastPitch == pitch && _tableLastIndex == index)
return;
#ifdef DEBUG_CODEC37
debug(7, "codec37::maketable(%d, %d) called", pitch, index);
#endif
_tableLastPitch = pitch;
_tableLastIndex = index;
index *= 255;
assert(index + 254 < (int)(sizeof(maketable_bytes) / 2));
for (int i = 0; i < 255; i++) {
int j = (i + index) << 1; // * 2
_offsetTable[i] = maketable_bytes[j + 1] * pitch + maketable_bytes[j];
}
}
void Codec37Decoder::proc1(Blitter & dst, Chunck & src, int next_offs, int bw, int bh, int size) {
unsigned char * decoded = new unsigned char[size];
int w = 0;
while(!src.eof()) {
int code = src.getByte();
int length = (code >> 1) + 1;
if (code & 1) {
unsigned char val = src.getByte();
while(length--)
decoded[w++] = val;
} else {
while(length--) {
decoded[w++] = src.getByte();
}
}
}
assert(w == size);
w = 0;
// Now we have our stream ready...
for(int i = 0; i < size; i++) {
if(decoded[i] == 0xFF) {
dst.putBlock(decoded + i + 1);
i += 16;
} else {
dst.blockCopy(_offsetTable[decoded[i]] + next_offs);
}
if(++w == bw) {
w = 0;
dst.advance(0, 3);
}
}
delete []decoded;
}
void Codec37Decoder::proc2(Blitter & dst, Chunck & src, int size) { // This is codec1 like...
#ifdef DEBUG_CODEC37_PROC2
int decoded_size = 0;
int coded_size = 0;
#endif
do {
int code = src.getByte();
int length = (code >> 1) + 1;
size -= length;
#ifdef DEBUG_CODEC37_PROC2
decoded_size += length;
coded_size += 1 + ((code & 1) ? 1 : length);
debug(7, "proc2() : code == %d : length == %d : decoded_size == %d : coded_size == %d : seek - header == %d : size == %d",
code, length, decoded_size, coded_size, src.tell() - 31, size + decoded_size);
#endif
if (code & 1)
dst.put(src.getChar(), length);
else
// while(length--) dst.put(src.get_char());
dst.blit(src, length);
} while (size);
}
void Codec37Decoder::proc3WithFDFE(Blitter & dst, Chunck & src, int next_offs, int bw, int bh) {
do {
int i = bw;
do {
int code = src.getByte();
if (code == 0xFD) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(1));
#else
dst.putBlock(expand(src.getByte()));
#endif
} else if (code == 0xFE) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(2));
#else
dst.putBlock(expand(src.getByte()), expand(src.getByte()), expand(src.getByte()), expand(src.getByte()));
#endif
} else if (code == 0xFF) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(3));
#else
dst.putBlock(src);
#endif
} else {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(4));
#else
dst.blockCopy(_offsetTable[code] + next_offs); // copy from an offset !
#endif
}
} while (--i);
dst.advance(0, 3); // advance 3 lines
} while (--bh);
}
void Codec37Decoder::proc3WithoutFDFE(Blitter & dst, Chunck & src, int next_offs, int bw, int bh) {
do {
int i = bw;
do {
int code = src.getByte();
if (code == 0xFF) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(5));
#else
dst.putBlock(src);
#endif
} else {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(6));
#else
dst.blockCopy(_offsetTable[code] + next_offs); // copy from an offset !
#endif
}
} while (--i);
dst.advance(0, 3); // advance 3 lines
} while (--bh);
}
void Codec37Decoder::proc4(Blitter & dst, Chunck & src, int next_offs, int bw, int bh) {
#ifdef DEBUG_CODEC37_PROC4
int b_nb = 0;
#endif
do {
int i = bw;
do {
int code = src.getByte();
if (code == 0xFD) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(7));
#else
dst.putBlock(expand(src.getByte()));
#endif
} else if (code == 0xFE) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(8));
#else
dst.putBlock(expand(src.getByte()), expand(src.getByte()), expand(src.getByte()), expand(src.getByte()));
#endif
} else if (code == 0xFF) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(9));
#else
dst.putBlock(src);
#endif
} else if (code == 0x00) {
int length = src.getByte() + 1;
for (int l = 0; l < length; l++) {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(10));
#else
dst.blockCopy(next_offs);
#endif
i--;
if (i == 0) {
dst.advance(0, 3); // advance 3 lines
bh--;
i = bw;
}
}
if(bh == 0) return;
i++;
} else {
#ifdef USE_COLOR_CODE_FOR_BLOCK
dst.putBlock(expand(11));
#else
dst.blockCopy(_offsetTable[code] + next_offs); // copy from an offset !
#endif
}
} while (--i);
dst.advance(0, 3); // advance 3 lines
} while (--bh);
}
bool Codec37Decoder::decode(Blitter & dst, Chunck & src) {
int width = getRect().width();
int height = getRect().height();
int bw = (width + 3) >> 2, bh = (height + 3) >> 2;
int pitch = bw << 2;
#ifdef DEBUG_CODEC37
debug(7, "codec37::decode() : width == %d : height == %d : pitch == %d : _prevSeqNb == %d",
width, height, pitch, _prevSeqNb);
#endif
int code = src.getByte(); // 0 -> 1 (1)
int index = src.getByte(); // 1 -> 2 (1)
unsigned short seq_nb = src.getWord(); // 2 -> 4 (2)
unsigned int decoded_size = src.getDword(); // 4 -> 8 (4)
#ifdef DEBUG_CODEC37
unsigned int coded_size = src.getDword(); // 8 -> 12 (4)
#else
src.seek(4);
#endif
unsigned int mask_flag = src.getDword(); // 12 -> 16 (4)
#ifdef DEBUG_CODEC37
debug(7, "codec37::decode() : code == %d : index == %d : seq_nb == %d : decoded_size == %d : coded_size == %d : mask_flag == %d",
code, index, seq_nb, decoded_size, coded_size, mask_flag);
#endif
maketable(pitch, index);
if(code == 3 || code == 4 || code == 1) {
assert(seq_nb && _prevSeqNb + 1 == seq_nb);
if (seq_nb & 1 || !(mask_flag & 1)) _curtable ^= 1;
}
Blitter blit((char *)_deltaBufs[_curtable], Point(width, height), Rect(0, 0, width, height));
switch(code) {
case 0:
memset(_deltaBuf, 0, _deltaBufs[_curtable] - _deltaBuf);
memset(_deltaBufs[_curtable] + decoded_size, 0, _deltaBuf + _deltaSize - _deltaBufs[_curtable] - decoded_size);
blit.blit(src, decoded_size);
break;
case 1:
proc1(blit, src, _deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh, decoded_size);
break;
case 2:
memset(_deltaBuf, 0, _deltaBufs[_curtable] - _deltaBuf);
memset(_deltaBufs[_curtable] + decoded_size, 0, _deltaBuf + _deltaSize - _deltaBufs[_curtable] - decoded_size);
proc2(blit, src, decoded_size);
break;
case 3:
if(mask_flag & 1)
proc3WithFDFE(blit, src, _deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh);
else
proc3WithoutFDFE(blit, src, _deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh);
break;
case 4:
proc4(blit, src, _deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh);
break;
default:
#ifdef DEBUG_CODEC37
error("codec37::decode() received an invalid code : %d", code);
#endif
break;
}
dst.blit((char*)_deltaBufs[_curtable], width * height);
_prevSeqNb = seq_nb;
return true;
}
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