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codec37.cpp
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codec37.cpp
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/* ScummVM - Scumm Interpreter
* Copyright (C) 2002-2003 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: /Users/sev/projects/sc/s/scummvm/scummex/codec37.cpp,v 1.1 2003/09/21 23:50:28 yoshizf Exp $
*
*/
#include "stdafx.h"
#include "bomp.h"
#include "codec37.h"
void Codec37Decoder::init(int width, int height) {
deinit();
_width = width;
_height = height;
_frameSize = _width * _height;
_deltaSize = _frameSize * 3 + 0x13600;
_deltaBuf = (byte *)calloc(_deltaSize, sizeof(byte));
if (_deltaBuf == 0)
printf("unable to allocate decoder buffer");
_deltaBufs[0] = _deltaBuf + 0x4D80;
_deltaBufs[1] = _deltaBuf + 0xE880 + _frameSize;
_offsetTable = new int16[255];
_curtable = 0;
if (_offsetTable == 0)
printf("unable to allocate decoder offset table");
_tableLastPitch = -1;
_tableLastIndex = -1;
}
Codec37Decoder::Codec37Decoder() {
_deltaSize = 0;
_deltaBuf = 0;
_deltaBufs[0] = 0;
_deltaBufs[1] = 0;
_curtable = 0;
_offsetTable = 0;
_tableLastPitch = -1;
_tableLastIndex = -1;
_prevSeqNb = 0;
}
void Codec37Decoder::deinit() {
if (_offsetTable) {
delete []_offsetTable;
_offsetTable = 0;
_tableLastPitch = -1;
_tableLastIndex = -1;
}
if (_deltaBuf) {
free(_deltaBuf);
_deltaSize = 0;
_deltaBuf = 0;
_deltaBufs[0] = 0;
_deltaBufs[1] = 0;
}
}
Codec37Decoder::~Codec37Decoder() {
deinit();
}
void Codec37Decoder::maketable(int pitch, int index) {
static const int8 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;
_tableLastPitch = pitch;
_tableLastIndex = index;
index *= 255;
assert(index + 254 < (int32)(sizeof(maketable_bytes) / 2));
for (int32 i = 0; i < 255; i++) {
int32 j = (i + index) << 1;
_offsetTable[i] = maketable_bytes[j + 1] * pitch + maketable_bytes[j];
}
}
#if defined(SCUMM_NEED_ALIGNMENT)
#define DECLARE_LITERAL_TEMP(v) \
byte v
#define READ_LITERAL_PIXEL(src, v) \
v = *src++
#define WRITE_4X1_LINE(dst, v) \
do { \
int j; \
for (j=0; j<4; j++) \
(dst)[j] = v; \
} while (0)
#define COPY_4X1_LINE(dst, src) \
do { \
int j; \
for (j=0; j<4; j++) \
(dst)[j] = (src)[j]; \
} while (0)
#else /* SCUMM_NEED_ALIGNMENT */
#define DECLARE_LITERAL_TEMP(v) \
uint32 v
#define READ_LITERAL_PIXEL(src, v) \
do { \
v = *src++; \
v += (v << 8) + (v << 16) + (v << 24); \
} while (0)
#define WRITE_4X1_LINE(dst, v) \
*(uint32 *)(dst) = v
#define COPY_4X1_LINE(dst, src) \
*(uint32 *)(dst) = *(const uint32 *)(src)
#endif /* SCUMM_NEED_ALIGNMENT */
/* Fill a 4x4 pixel block with a literal pixel value */
#define LITERAL_4X4(src, dst, pitch) \
do { \
int x; \
DECLARE_LITERAL_TEMP(t); \
READ_LITERAL_PIXEL(src, t); \
for (x=0; x<4; x++) { \
WRITE_4X1_LINE(dst + pitch * x, t); \
} \
dst += 4; \
} while (0)
/* Fill four 4x1 pixel blocks with literal pixel values */
#define LITERAL_4X1(src, dst, pitch) \
do { \
int x; \
DECLARE_LITERAL_TEMP(t); \
for (x=0; x<4; x++) { \
READ_LITERAL_PIXEL(src, t); \
WRITE_4X1_LINE(dst + pitch * x, t); \
} \
dst += 4; \
} while (0)
/* Fill sixteen 1x1 pixel blocks with literal pixel values */
#define LITERAL_1X1(src, dst, pitch) \
do { \
int x; \
for (x=0; x<4; x++) { \
COPY_4X1_LINE(dst + pitch * x, src); \
src += 4; \
} \
dst += 4; \
} while (0)
/* Copy a 4x4 pixel block from a different place in the framebuffer */
#define COPY_4X4(dst2, dst, pitch) \
do { \
int x; \
for (x=0; x<4; x++) { \
COPY_4X1_LINE(dst + pitch * x, dst2 + pitch * x); \
} \
dst += 4; \
} while (0)
void Codec37Decoder::proc3WithFDFE(byte *dst, const byte *src, int32 next_offs, int bw, int bh, int pitch, int16 *offset_table) {
do {
int32 i = bw;
do {
int32 code = *src++;
if (code == 0xFD) {
LITERAL_4X4(src, dst, pitch);
} else if (code == 0xFE) {
LITERAL_4X1(src, dst, pitch);
} else if (code == 0xFF) {
LITERAL_1X1(src, dst, pitch);
} else {
byte *dst2 = dst + _offsetTable[code] + next_offs;
COPY_4X4(dst2, dst, pitch);
}
} while (--i);
dst += pitch * 3;
} while (--bh);
}
void Codec37Decoder::proc3WithoutFDFE(byte *dst, const byte *src, int32 next_offs, int bw, int bh, int pitch, int16 *offset_table) {
do {
int32 i = bw;
do {
int32 code = *src++;
if (code == 0xFF) {
LITERAL_1X1(src, dst, pitch);
} else {
byte *dst2 = dst + _offsetTable[code] + next_offs;
COPY_4X4(dst2, dst, pitch);
}
} while (--i);
dst += pitch * 3;
} while (--bh);
}
void Codec37Decoder::proc4WithFDFE(byte *dst, const byte *src, int32 next_offs, int bw, int bh, int pitch, int16 *offset_table) {
do {
int32 i = bw;
do {
int32 code = *src++;
if (code == 0xFD) {
LITERAL_4X4(src, dst, pitch);
} else if (code == 0xFE) {
LITERAL_4X1(src, dst, pitch);
} else if (code == 0xFF) {
LITERAL_1X1(src, dst, pitch);
} else if (code == 0x00) {
int32 length = *src++ + 1;
for (int32 l = 0; l < length; l++) {
byte *dst2 = dst + next_offs;
COPY_4X4(dst2, dst, pitch);
i--;
if (i == 0) {
dst += pitch * 3;
bh--;
i = bw;
}
}
if (bh == 0) {
return;
}
i++;
} else {
byte *dst2 = dst + _offsetTable[code] + next_offs;
COPY_4X4(dst2, dst, pitch);
}
} while (--i);
dst += pitch * 3;
} while (--bh);
}
void Codec37Decoder::proc4WithoutFDFE(byte *dst, const byte *src, int32 next_offs, int bw, int bh, int pitch, int16 *offset_table) {
do {
int32 i = bw;
do {
int32 code = *src++;
if (code == 0xFF) {
LITERAL_1X1(src, dst, pitch);
} else if (code == 0x00) {
int32 length = *src++ + 1;
for (int32 l = 0; l < length; l++) {
byte *dst2 = dst + next_offs;
COPY_4X4(dst2, dst, pitch);
i--;
if (i == 0) {
dst += pitch * 3;
bh--;
i = bw;
}
}
if (bh == 0) {
return;
}
i++;
} else {
byte *dst2 = dst + _offsetTable[code] + next_offs;
COPY_4X4(dst2, dst, pitch);
}
} while (--i);
dst += pitch * 3;
} while (--bh);
}
void Codec37Decoder::decode(byte *dst, const byte *src) {
int32 bw = (_width + 3) >> 2, bh = (_height + 3) >> 2;
int32 pitch = bw << 2;
int16 seq_nb = READ_LE_UINT16(src + 2);
int32 decoded_size = READ_LE_UINT32(src + 4);
byte mask_flags = src[12];
maketable(pitch, src[1]);
int32 tmp;
switch(src[0]) {
case 0:
if ((_deltaBufs[_curtable] - _deltaBuf) > 0) {
memset(_deltaBuf, 0, _deltaBufs[_curtable] - _deltaBuf);
}
tmp = (_deltaBuf + _deltaSize) - _deltaBufs[_curtable] - decoded_size;
if (tmp > 0) {
memset(_deltaBufs[_curtable] + decoded_size, 0, tmp);
}
memcpy(_deltaBufs[_curtable], src + 16, decoded_size);
break;
case 1:
printf("codec37: missing opcode 1");
break;
case 2:
bompDecodeLine(_deltaBufs[_curtable], src + 16, decoded_size);
if ((_deltaBufs[_curtable] - _deltaBuf) > 0) {
memset(_deltaBuf, 0, _deltaBufs[_curtable] - _deltaBuf);
}
tmp = (_deltaBuf + _deltaSize) - _deltaBufs[_curtable] - decoded_size;
if (tmp > 0) {
memset(_deltaBufs[_curtable] + decoded_size, 0, tmp);
}
break;
case 3:
if ((seq_nb & 1) || !(mask_flags & 1)) {
_curtable ^= 1;
}
if ((mask_flags & 4) != 0) {
proc3WithFDFE(_deltaBufs[_curtable], src + 16,
_deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh,
pitch, _offsetTable);
} else {
proc3WithoutFDFE(_deltaBufs[_curtable], src + 16,
_deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh,
pitch, _offsetTable);
}
break;
case 4:
if ((seq_nb & 1) || !(mask_flags & 1)) {
_curtable ^= 1;
}
if ((mask_flags & 4) != 0) {
proc4WithFDFE(_deltaBufs[_curtable], src + 16,
_deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh,
pitch, _offsetTable);
} else {
proc4WithoutFDFE(_deltaBufs[_curtable], src + 16,
_deltaBufs[_curtable ^ 1] - _deltaBufs[_curtable], bw, bh,
pitch, _offsetTable);
}
break;
default:
break;
}
_prevSeqNb = seq_nb;
memcpy(dst, _deltaBufs[_curtable], _frameSize);
}