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xvpic2.c
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xvpic2.c
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/*
* $Id: xvpic2.c,v 2.9.1.14 1995/04/24 15:34:15 ikeyan Exp $
* xvpic2.c - load and save routines for `PIC2' format pictures.
*
*
* Outline
* =======
* xvpic2.c supports the PIC2 format image file. It is used some
* Japanese personal computer users.
*
* The PIC2 format is designed by A.Yanagisawa. It is an excellent
* format except for its encode/decode speed. ;-)
*
* The features of the PIC2 format:
* - Powerful header information (included author, filename, title,
* saver, product number, created date and comment).
* - Reversible compression, and very high compression ratio (in many
* cases, a higher compression ratio than the JPEG compression;
* because of its compression method, PIC2 is especially good at
* pictures like cell animation).
* - Can handle full-color (24 bits) image.
* - Can include multi image blocks into one PIC2 file.
* - Have four different block format (P2SS, P2SF, P2BM and
* P2BI). P2SS format uses arithmetic compression for storing
* data. P2SF uses normal run-length compression. P2BM and P2BI is
* raw image format. Select any one according to the situation.
*
* Explanation of the PIC2 compression:
* - In the first place, try to record pixel color, uses color caches
* which keep some recent colors, and formed according to color's
* frequency. PIC2 has some color cache spaces that are switched by
* upper pixel value of current pixel. If cache is hit, record
* that.
* - Unfortunately, in the case of color cache didn't hit, record the
* difference from the value estimated with the value of upper and
* left pixel of current pixel (similar to PNG's AVG predictor).
* - And extract image's color chain if exist, and record that (it
* results in image's outline).
* - In all cases, arithmetic compression is used in the final stage
* before writing the file, which in theory produces the ideal
* compression ratio (P2SS).
*
* Features
* ========
* - Support 3,6,9,12,15,18,21,24bit PIC2 format (Load/Save).
* - Support all image block formats of PIC2 (Load/Save).
* - Support multi block PIC2 file (Load/Save).
*
*
* Bugs
* ====
* - Unsupport 8bit PIC2 image file.
*
* If you find other bugs (surely exist :-)), send me bug-report.
*
*
* Author
* ======
* IKEMOTO Masahiro <ikeyan@airlab.cs.ritsumei.ac.jp>
*/
#define PIC2_IGNORE_UNUSED_FUNCTIONS
#define NEEDSDIR
#include "xv.h"
#include <setjmp.h>
#ifdef HAVE_PIC2
typedef unsigned long pixel;
#define pic2_cextoshort(addr) ( \
(((short) (((byte *) addr)[0])) << 8) | \
( (short) (((byte *) addr)[1])) \
)
#define pic2_cextolong(addr) ( \
(((long) (((byte *) addr)[0])) << 24) | \
(((long) (((byte *) addr)[1])) << 16) | \
(((long) (((byte *) addr)[2])) << 8) | \
( (long) (((byte *) addr)[3])) \
)
#define pic2_shorttocex(addr, n) { \
((byte *) addr)[0] = (((unsigned short) (n) >> 8) & 0xff); \
((byte *) addr)[1] = ( (unsigned short) (n) & 0xff); \
}
#define pic2_longtocex(addr, n) { \
((byte *) addr)[0] = (((unsigned long) (n) >> 24) & 0xff); \
((byte *) addr)[1] = (((unsigned long) (n) >> 16) & 0xff); \
((byte *) addr)[2] = (((unsigned long) (n) >> 8) & 0xff); \
((byte *) addr)[3] = ( (unsigned long) (n) & 0xff); \
}
#define pic2_shift_bits(b, n) (((n) > 0) ? ((b) << (n)) : ((b) >> -(n)))
#define PIC2_READ_MODE 0
#define PIC2_WRITE_MODE 1
#define PIC2_ARITH_CACHE 32
#define PIC2_ARITH_CONTEXT 128
#define PIC2_FAST_CACHE 64
#define PIC2_HEADER_SIZE 124
#define PIC2_BLOCK_HEADER_SIZE 26
struct pic2_header {
char magic[4];
char name[18];
char subtitle[8];
char crlf0[2];
char title[30];
char crlf1[2];
char saver[30];
char crlf2[2];
char eof[1];
char reserve0[1];
short flag;
short no;
long time;
long size;
short depth;
short x_aspect;
short y_aspect;
short x_max;
short y_max;
long reserve1;
};
struct pic2_block {
char id[4];
long size;
short flag;
short x_wid;
short y_wid;
short x_offset;
short y_offset;
long opaque;
long reserve;
};
struct pic2_info {
jmp_buf jmp;
FILE *fp;
struct {
int rest;
byte cur;
int bits;
char zero;
}bs;
long fsize;
struct pic2_header *header;
struct pic2_block *block;
int n_pal;
int pal_bits;
byte pal[256][3];
char *comment;
char mode;
long next_pos;
long block_pos;
short x_max;
short y_max;
int ynow;
byte *buf;
pixel *vram_prev;
pixel *vram_now;
pixel *vram_next;
short *flag_now;
short *flag_next;
short *flag2_now;
short *flag2_next;
short *flag2_next2;
pixel (*cache)[PIC2_ARITH_CACHE];
unsigned short *cache_pos;
unsigned short *mulu_tab;
long aa;
long cc;
long dd;
char cache_hit_c;
int (*next_line) PARM((struct pic2_info *, pixel **));
char writing_grey;
char pagebname[64];
int pnum;
};
static void pic2_open_file PARM((struct pic2_info*,char*));
static void pic2_read_header PARM((struct pic2_info*));
static void pic2_read_block_header1 PARM((struct pic2_info*));
static void pic2_read_block_header2 PARM((struct pic2_info*));
static short pic2_arith_decode_bit PARM((struct pic2_info*,int));
static short pic2_arith_decode_nn PARM((struct pic2_info*,int));
static void pic2_arith_expand_chain PARM((struct pic2_info*,int,int,pixel));
static short pic2_arith_get_number PARM((struct pic2_info*,int,int));
static pixel pic2_arith_read_color PARM((struct pic2_info*,int));
static int pic2_arith_expand_line PARM((struct pic2_info*,pixel**));
static int pic2_arith_loader_init PARM((struct pic2_info*));
static int pic2_fast_read_length PARM((struct pic2_info*));
static void pic2_fast_expand_chain PARM((struct pic2_info*,int,pixel));
static pixel pic2_fast_read_color PARM((struct pic2_info*,pixel));
static int pic2_fast_expand_line PARM((struct pic2_info*,pixel**));
static int pic2_fast_loader_init PARM((struct pic2_info*));
static int pic2_beta_expand_line PARM((struct pic2_info*,pixel**));
static int pic2_beta_loader_init PARM((struct pic2_info*));
static void pic2_make_xvpic PARM((struct pic2_info*,byte**,
byte*,byte*,byte*));
static void pic2_make_pagefile PARM((struct pic2_info*,char*,int));
static void pic2_setup_pic2_info PARM((struct pic2_info*,
char*,char*,char*,char*,
int,int,int,int,int,int,char *));
static void pic2_append PARM((struct pic2_info*));
static void pic2_write_header1 PARM((struct pic2_info*));
static void pic2_write_header2 PARM((struct pic2_info*));
static void pic2_write_block_header PARM((struct pic2_info*));
static void pic2_arith_write_zero_bit PARM((struct pic2_info*));
static void pic2_arith_flush_bit_buf PARM((struct pic2_info*));
static void pic2_arith_carry_bit PARM((struct pic2_info*));
static void pic2_arith_encode_bit PARM((struct pic2_info*,int,int));
static void pic2_arith_encode_nbyte PARM((struct pic2_info*,int,int,int));
static void pic2_arith_encode_nn PARM((struct pic2_info*,int,int));
static void pic2_arith_press_chain PARM((struct pic2_info*,int));
static void pic2_arith_put_number PARM((struct pic2_info*,int,int,int));
static void pic2_arith_write_color PARM((struct pic2_info*,int));
static void pic2_arith_press_line2 PARM((struct pic2_info*));
static int pic2_arith_press_line PARM((struct pic2_info*,pixel**));
static int pic2_arith_saver_init PARM((struct pic2_info*,pixel**));
static void pic2_fast_write_length PARM((struct pic2_info*,int));
static void pic2_fast_press_chain PARM((struct pic2_info*,int));
static void pic2_fast_press_chain2 PARM((struct pic2_info*,int));
static void pic2_fast_flush_chain PARM((struct pic2_info*));
static void pic2_fast_write_color PARM((struct pic2_info*,int));
static void pic2_fast_press_line2 PARM((struct pic2_info*));
static int pic2_fast_press_line PARM((struct pic2_info*,pixel**));
static int pic2_fast_saver_init PARM((struct pic2_info*,pixel**));
static int pic2_beta_press_line PARM((struct pic2_info*,pixel**));
static int pic2_beta_saver_init PARM((struct pic2_info*,pixel**));
static void pic2_write_data PARM((struct pic2_info*,byte*,
int,int,int,int,int,
byte*,byte*,byte*,int,int));
static int pic2_next_line PARM((struct pic2_info*,pixel**));
static int pic2_next_block PARM((struct pic2_info*));
static int pic2_find_block PARM((struct pic2_info*));
static int pic2_load_block PARM((struct pic2_info*));
static int pic2_save_block PARM((struct pic2_info*,pixel**,
int,int,int,int,char*,pixel));
#ifndef PIC2_IGNORE_UNUSED_FUNCTIONS
static void pic2_read_palette PARM((struct pic2_info*,
byte*,byte*,byte*));
static void pic2_write_palette PARM((struct pic2_info*,int,int,
byte*,byte*,byte*));
#endif /* !PIC2_IGNORE_UNUSED_FUNCTIONS */
static byte pic2_convert_color_bits PARM((int,int,int));
static byte pic2_pad_color_bits PARM((int,int,int));
static byte pic2_reduce_color_bits PARM((int,int,int));
static pixel pic2_exchange_rg PARM((pixel,int));
static void pic2_handle_para PARM((struct pic2_info*,int));
static int pic2_alloc_buffer PARM((struct pic2_info*));
static void pic2_free_buffer PARM((struct pic2_info*));
static long pic2_seek_file PARM((struct pic2_info*,long,int));
static long pic2_tell_file PARM((struct pic2_info*));
static int pic2_read_file PARM((struct pic2_info*,void*,size_t));
static long pic2_read_long PARM((struct pic2_info*));
static short pic2_read_short PARM((struct pic2_info*));
static char pic2_read_char PARM((struct pic2_info*));
static int pic2_write_file PARM((struct pic2_info*,void*,size_t));
static int pic2_write_long PARM((struct pic2_info*,long));
static int pic2_write_short PARM((struct pic2_info*,int));
static int pic2_write_char PARM((struct pic2_info*,int));
static unsigned long pic2_read_bits PARM((struct pic2_info*,int));
static void pic2_write_bits PARM((struct pic2_info*,
unsigned long,int));
static void pic2_flush_bits PARM((struct pic2_info*));
static void pic2_memory_error PARM((char*,char*));
static void pic2_error PARM((struct pic2_info*,int));
static void pic2_file_error PARM((struct pic2_info*,int));
static void pic2_init_info PARM((struct pic2_info*));
static void pic2_cleanup_pic2_info PARM((struct pic2_info*,int));
static void pic2_cleanup_pinfo PARM((PICINFO*));
static void pic2_show_pic2_info PARM((struct pic2_info*));
static char *pic2_strncpy PARM((char*,char*,size_t));
static void *pic2_malloc PARM((size_t,char*));
static void *pic2_new PARM((size_t,char*));
static int WritePIC2 PARM((FILE*,byte*,int,int,int,
byte*,byte*,byte*,int,int,char*,
int,int,int,int,int,char*));
static char *pic2_id = "P2DT";
/* Error Messages */
static char *pic2_msgs[] = {
NULL,
#define PIC2_OPEN 1
"can't open file.",
#define PIC2_CORRUPT 2
"file corrupted.",
#define PIC2_FORMAT 3
"not PIC2 format.",
#define PIC2_DEPTH 4
"bit depths not divisible by 3 are unsupported.",
#define PIC2_TMPFILE 5
"unable to create temporary filename???",
#define PIC2_PAGE 6
"couldn't load the page.",
#define PIC2_APPEND 7
"cannot append.",
#define PIC2_WRITE 8
"write failed.",
};
struct _form_tab {
char *id;
int (*loader_init) PARM((struct pic2_info *));
int (*saver_init) PARM((struct pic2_info *, pixel **));
} form_tab[] = {
{ "P2SS", pic2_arith_loader_init, pic2_arith_saver_init},
{ "P2SF", pic2_fast_loader_init, pic2_fast_saver_init},
{ "P2BM", pic2_beta_loader_init, pic2_beta_saver_init},
{ "P2BI", pic2_beta_loader_init, pic2_beta_saver_init},
};
#define n_form_tab (sizeof(form_tab) / sizeof(struct _form_tab))
#define P2SS 0
#define P2SF 1
#define P2BM 2
#define P2BI 3
/* The main routine to load a PIC2 file. */
int LoadPIC2(fname, pinfo, quick)
char *fname;
PICINFO *pinfo;
int quick;
{
int e, i, block;
struct pic2_info pic2;
if (DEBUG)
fputs("LoadPIC2:\n", stderr);
pic2_init_info(&pic2);
if ((e = setjmp(pic2.jmp)) != 0){
/* When an error occurs, comes here. */
pic2_free_buffer(&pic2);
pic2_cleanup_pic2_info(&pic2, 0);
pic2_cleanup_pinfo(pinfo);
if (pic2split)
KillPageFiles(pic2.pagebname, pic2.pnum);
SetCursors(-1);
if (DEBUG)
fputs("\n", stderr);
return (0);
}
pic2_open_file(&pic2, fname);
pic2_read_header(&pic2);
if ((i = pic2_find_block(&pic2)) == 0)
pic2_file_error(&pic2, PIC2_CORRUPT);
block = 1;
while(i == 2) {
SetISTR(ISTR_WARNING, "unknown or invalid block #%d.", block);
i = pic2_next_block(&pic2);
block++;
}
if (pic2split && !quick) {
char firstpage[512];
struct stat st;
#ifndef USE_MKSTEMP
int tmpfd;
#endif
#ifndef VMS
sprintf(pic2.pagebname, "%s/xvpic2XXXXXX", tmpdir);
#else
sprintf(pic2.pagebname, "Sys$Scratch:xvpic2XXXXXX");
#endif
#ifdef USE_MKSTEMP
close(mkstemp(pic2.pagebname));
#else
mktemp(pic2.pagebname);
tmpfd = open(pic2.pagebname, O_WRONLY|O_CREAT|O_EXCL, S_IRWUSR);
if (tmpfd < 0) FatalError("LoadPIC2(): can't create temporary file");
close(tmpfd);
#endif
if (pic2.pagebname[0] == '\0')
pic2_error(&pic2, PIC2_TMPFILE);
strcat(pic2.pagebname, ".");
sprintf(firstpage, "%s%d", pic2.pagebname, 1);
if (stat(firstpage, &st)) {
for (pic2.pnum = 1; i >= 1; pic2.pnum++) {
pic2_load_block(&pic2);
pic2_make_pagefile(&pic2, pic2.pagebname, pic2.pnum);
while(block++, (i = pic2_next_block(&pic2)) == 2)
SetISTR(ISTR_WARNING,
"unknown or invalid block #%d.", block);
}
pinfo->numpages = --pic2.pnum;
if (!LoadPIC2(firstpage, pinfo, 1))
pic2_error(&pic2, PIC2_PAGE);
if (pic2.pnum == 1)
unlink(firstpage);
else
strcpy(pinfo->pagebname, pic2.pagebname);
} else
if (!LoadPIC2(fname, pinfo, 1))
pic2_error(&pic2, PIC2_PAGE);
} else {
char buf[128], format[64];
int j;
pinfo->w = pic2.x_max;
pinfo->h = pic2.y_max;
pinfo->normw = pinfo->w;
pinfo->normh = pinfo->h;
pinfo->type = PIC24;
for (j = 0; j < n_form_tab; j++) {
if (xvbcmp(pic2.block->id, form_tab[j].id, (size_t) 4) == 0)
break;
}
pinfo->frmType = F_PIC2;
pinfo->colType = F_FULLCOLOR;
pinfo->comment = pic2.comment;
if (pic2split) {
pic2_make_xvpic(&pic2, &pinfo->pic, pinfo->r, pinfo->g, pinfo->b);
strcpy(format, form_tab[j].id);
} else {
for (pic2.pnum = 1; i >= 1; pic2.pnum++) {
SetISTR(ISTR_INFO, "composing block #%d", block);
pic2_make_xvpic(&pic2, &pinfo->pic,
pinfo->r, pinfo->g, pinfo->b);
while(block++, (i = pic2_next_block(&pic2)) == 2)
SetISTR(ISTR_WARNING,
"unknown or invalid block #%d.", block);
}
if (--block > 1)
if (block != --pic2.pnum)
sprintf(format, "MultiBlock[%d/%d]", block, pic2.pnum);
else
sprintf(format, "MultiBlock[%d]", block);
else
strcpy(format, form_tab[j].id);
}
sprintf(buf, "PIC2(%s). %d colors (%ld bytes)", format,
(int) 1 << pic2.header->depth, pic2.fsize);
strcat(pinfo->fullInfo, buf);
sprintf(pinfo->shrtInfo, "%dx%d(aspect %4.2f) PIC2(%s).",
pinfo->w, pinfo->h,
(float) pic2.header->x_aspect / (float) pic2.header->y_aspect,
format);
if (!nopicadjust)
normaspect = (float) pic2.header->x_aspect
/ (float) pic2.header->y_aspect;
}
pic2_cleanup_pic2_info(&pic2, 0);
SetCursors(-1);
if (DEBUG)
fputs("\n", stderr);
return (1);
}
/*
* This function opens the file, and set its size.
*/
static void pic2_open_file(pi, fname)
struct pic2_info *pi;
char *fname;
{
if ((pi->fp = fopen(fname, "rb")) == NULL)
pic2_file_error(pi, PIC2_OPEN);
fseek(pi->fp, (size_t) 0, SEEK_END);
pi->fsize = ftell(pi->fp);
fseek(pi->fp, (size_t) 0, SEEK_SET);
}
/*
* These functions read the PIC2 header informations.
* pic2_read_header:
* reads the PIC2 header.
* pic2_read_block_header1:
* reads the id number of block header and the size of block.
* pic2_read_block_header2:
* reads the rest of block header.
*/
static void pic2_read_header(pi)
struct pic2_info *pi;
{
long s_comment;
pi->mode = PIC2_READ_MODE;
/* read header image */
pic2_read_file(pi, pi->header->magic, 4);
pic2_read_file(pi, pi->header->name, 18);
pic2_read_file(pi, pi->header->subtitle, 8);
pic2_read_file(pi, pi->header->crlf0, 2);
pic2_read_file(pi, pi->header->title, 30);
pic2_read_file(pi, pi->header->crlf1, 2);
pic2_read_file(pi, pi->header->saver, 30);
pic2_read_file(pi, pi->header->crlf2, 2);
pic2_read_file(pi, pi->header->eof, 1);
pic2_read_file(pi, pi->header->reserve0, 1);
pi->header->flag = pic2_read_short(pi);
pi->header->no = pic2_read_short(pi);
pi->header->time = pic2_read_long(pi);
pi->header->size = pic2_read_long(pi);
pi->header->depth = pic2_read_short(pi);
pi->header->x_aspect = pic2_read_short(pi);
pi->header->y_aspect = pic2_read_short(pi);
pi->header->x_max = pic2_read_short(pi);
pi->header->y_max = pic2_read_short(pi);
pi->header->reserve1 = pic2_read_long(pi);
/* check magic number */
if (strncmp(pi->header->magic, pic2_id, (size_t) 4) != 0)
pic2_error(pi, PIC2_FORMAT);
/* read palette data, if exists */
if (pi->header->flag & 1) {
pi->pal_bits = pic2_read_char(pi);
pi->n_pal = pic2_read_short(pi);
pic2_read_file(pi, pi->pal, (size_t) (pi->n_pal * 3));
}
/* read comments */
s_comment = pi->header->size - pic2_tell_file(pi);
pi->comment = pic2_new(s_comment + 1, "pic2_read_header");
pic2_read_file(pi, pi->comment, (size_t) s_comment);
pi->comment[s_comment] = '\0';
pi->x_max = pi->header->x_max;
pi->y_max = pi->header->y_max;
/* set initial block point */
pi->next_pos = pic2_tell_file(pi);
}
static void pic2_read_block_header1(pi)
struct pic2_info *pi;
{
pic2_read_file(pi, pi->block->id, 4);
pi->block->size = pic2_read_long(pi);
}
static void pic2_read_block_header2(pi)
struct pic2_info *pi;
{
pi->block->flag = pic2_read_short(pi);
pi->block->x_wid = pic2_read_short(pi);
pi->block->y_wid = pic2_read_short(pi);
pi->block->x_offset = pic2_read_short(pi);
pi->block->y_offset = pic2_read_short(pi);
pi->block->opaque = pic2_read_long(pi);
pi->block->reserve = pic2_read_long(pi);
}
/*
* These functions are arithmetic pic2 format extractor.
*/
static short pic2_arith_decode_bit(pi, c)
struct pic2_info *pi;
int c;
{
unsigned short pp;
pp = pi->mulu_tab[(pi->aa & 0x7f00) / 2 + c];
if (pi->dd >= (int) pp) {
pi->dd -= pp;
pi->aa -= pp;
while ((short) pi->aa >= 0) {
pi->dd *= 2;
if (pic2_read_bits(pi, 1))
pi->dd++;
pi->aa *= 2;
}
return (1);
} else {
pi->aa = pp;
while ((short) pi->aa >= 0) {
pi->dd *= 2;
if (pic2_read_bits(pi, 1))
pi->dd++;
pi->aa *= 2;
}
return (0);
}
}
static short pic2_arith_decode_nn(pi, c)
struct pic2_info *pi;
int c;
{
int n;
if (pic2_arith_decode_bit(pi, c)) {
/* n < 1 */
n = 0;
} else if (pic2_arith_decode_bit(pi, c + 1)) {
/* n < 1 + 2 */
n = 1;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
} else if (pic2_arith_decode_bit(pi, c + 2)) {
/* n < 1 + 2 + 4 */
n = 1 + 2;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
} else if (pic2_arith_decode_bit(pi, c + 3)) {
/* n < 1 + 2 + 4 + 8 */
n = 1 + 2 + 4;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
if (pic2_arith_decode_bit(pi, c + 10))
n += 4;
} else if (pic2_arith_decode_bit(pi, c + 4)) {
/* n < 1 + 2 + 4 + 8 + 16 */
n = 1 + 2 + 4 + 8;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
if (pic2_arith_decode_bit(pi, c + 10))
n += 4;
if (pic2_arith_decode_bit(pi, c + 11))
n += 8;
} else if (pic2_arith_decode_bit(pi, c + 5)) {
/* n < 1 + 2 + 4 + 8 + 16 + 32 */
n = 1 + 2 + 4 + 8 + 16;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
if (pic2_arith_decode_bit(pi, c + 10))
n += 4;
if (pic2_arith_decode_bit(pi, c + 11))
n += 8;
if (pic2_arith_decode_bit(pi, c + 12))
n += 16;
} else if (pic2_arith_decode_bit(pi, c + 6)) {
/* n < 1 + 2 + 4 + 8 + 16 + 32 + 64 */
n = 1 + 2 + 4 + 8 + 16 + 32;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
if (pic2_arith_decode_bit(pi, c + 10))
n += 4;
if (pic2_arith_decode_bit(pi, c + 11))
n += 8;
if (pic2_arith_decode_bit(pi, c + 12))
n += 16;
if (pic2_arith_decode_bit(pi, c + 13))
n += 32;
} else if (pic2_arith_decode_bit(pi, c + 7)) {
/* n < 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128 */
n = 1 + 2 + 4 + 8 + 16 + 32 + 64;
if (pic2_arith_decode_bit(pi, c + 8))
n += 1;
if (pic2_arith_decode_bit(pi, c + 9))
n += 2;
if (pic2_arith_decode_bit(pi, c + 10))
n += 4;
if (pic2_arith_decode_bit(pi, c + 11))
n += 8;
if (pic2_arith_decode_bit(pi, c + 12))
n += 16;
if (pic2_arith_decode_bit(pi, c + 13))
n += 32;
if (pic2_arith_decode_bit(pi, c + 14))
n += 64;
} else {
n = 1 + 2 + 4 + 8 + 16 + 32 + 64 + 128;
}
return (n);
}
static void pic2_arith_expand_chain(pi, x, y, cc)
struct pic2_info *pi;
int x, y;
pixel cc;
{
static const unsigned short c_tab[] = {
80 + 6 * 5, /* -5 */
80 + 6 * 4,
80 + 6 * 3,
80 + 6 * 2,
80 + 6 * 1,
80 + 6 * 0, /* 0 */
80 + 6 * 0, /* 1 */
};
unsigned short b;
b = c_tab[pi->flag_now[x] + 5];
if (!pic2_arith_decode_bit(pi, b++)) {
if (pic2_arith_decode_bit(pi, b++)) { /* down */
pi->vram_next[x ] = cc;
pi->flag_next[x ] = -1;
} else if (pic2_arith_decode_bit(pi, b++)) { /* left */
pi->vram_next[x - 1] = cc;
pi->flag_next[x - 1] = -2;
} else if (pic2_arith_decode_bit(pi, b++)) { /* right */
pi->vram_next[x + 1] = cc;
pi->flag_next[x + 1] = -3;
} else if (pic2_arith_decode_bit(pi, b++)) { /* left2 */
pi->vram_next[x - 2] = cc;
pi->flag_next[x - 2] = -4;
} else { /* right2 */
pi->vram_next[x + 2] = cc;
pi->flag_next[x + 2] = -5;
}
}
}
static short pic2_arith_get_number(pi, c, bef)
struct pic2_info *pi;
int c, bef;
{
unsigned short n;
byte maxcol;
maxcol = 0xff >> (8 - pi->header->depth / 3);
n = pic2_arith_decode_nn(pi, c);
if (bef > ((int) maxcol >> 1)) {
if (n > ((int) maxcol - bef) * 2)
n = maxcol - n;
else if (n & 1)
n = n / 2 + bef + 1;
else
n = bef - n / 2;
} else {
if ((int) n > (bef * 2))
n = n;
else if (n & 1)
n = n / 2 + bef + 1;
else
n = bef - n / 2;
}
return (n);
}
static pixel pic2_arith_read_color(pi, x)
struct pic2_info *pi;
int x;
{
pixel c1, c2, cc;
unsigned short i, j, k, m;
short r, g, b, r0, g0, b0;
short colbits;
pixel rmask, gmask, bmask;
byte maxcol;
colbits = pi->header->depth / 3;
rmask = (0xff >> (8 - colbits)) << (colbits * 2);
gmask = (0xff >> (8 - colbits)) << colbits;
bmask = (0xff >> (8 - colbits));
maxcol = (byte) bmask;
c1 = pi->vram_prev[x];
k = ((c1 >> ((colbits - 3) * 3)) & 0x1c0)
| ((c1 >> ((colbits - 3) * 2)) & 0x038)
| ((c1 >> (colbits - 3) ) & 0x007);
if (colbits == 5)
k = pic2_exchange_rg(k, 3);
if (pic2_arith_decode_bit(pi, pi->cache_hit_c)) { /* ouch */
pi->cache_hit_c = 16;
c2 = pi->vram_now[x - 1];
r = ((c1 & rmask) + (c2 & rmask)) >> (colbits * 2 + 1);
g = ((c1 & gmask) + (c2 & gmask)) >> (colbits + 1);
b = ((c1 & bmask) + (c2 & bmask)) >> ( 1);
g0 = pic2_arith_get_number(pi, 32, g);
r = r + g0 - g;
if (r > (short) maxcol)
r = maxcol;
else if (r < 0)
r = 0;
b = b + g0 - g;
if (b > (short) maxcol)
b = maxcol;
else if (b < 0)
b = 0;
r0 = pic2_arith_get_number(pi, 48, r);
b0 = pic2_arith_get_number(pi, 64, b);
pi->cache_pos[k] = j = (pi->cache_pos[k] - 1) & (PIC2_ARITH_CACHE - 1);
pi->cache[k][j] = cc = (r0 << (colbits * 2)) | (g0 << colbits) | b0;
} else {
pi->cache_hit_c = 15;
j = pic2_arith_decode_nn(pi, 17);
m = pi->cache_pos[k];
i = (m + j / 2) & (PIC2_ARITH_CACHE - 1);
j = (m + j) & (PIC2_ARITH_CACHE - 1);
cc = pi->cache[k][j];
pi->cache[k][j] = pi->cache[k][i];
pi->cache[k][i] = pi->cache[k][m];
pi->cache[k][m] = cc;
}
return (cc);
}
static int pic2_arith_expand_line(pi, line)
struct pic2_info *pi;
pixel **line;
{
int ymax;
int x, xw;
pixel cc;
pic2_handle_para(pi, 0);
xw = pi->block->x_wid;
ymax = pi->block->y_wid - 1;
if (pi->ynow > ymax)
return (-2); /* end */
/* set right end of previous line before left end of current line. */
if (pi->ynow == 0) {
cc = 0;
} else
cc = pi->vram_prev[xw - 1];
pi->vram_now[-1] = cc;
/* clear flag for change point */
xvbzero((char *) pi->flag_next, xw * sizeof(pi->flag_next[0]));
/* clear flag for position probability space */
xvbzero((char *) pi->flag2_next2, xw * sizeof(pi->flag2_next2[0]));
for (x = 0; x < xw; x++) {
if (pi->flag_now[x] < 0) {
cc = pi->vram_now[x];
if (pi->ynow < ymax)
pic2_arith_expand_chain(pi, x, pi->ynow, cc);
} else if (pic2_arith_decode_bit(pi, pi->flag2_now[x])) {
/* ajust probability space around of change point */
pi->flag2_now [x + 1]++;
pi->flag2_now [x + 2]++;
pi->flag2_next [x - 1]++;
pi->flag2_next [x ]++;
pi->flag2_next [x + 1]++;
pi->flag2_next2[x - 1]++;
pi->flag2_next2[x ]++;
pi->flag2_next2[x + 1]++;
pi->vram_now[x] = cc = pic2_arith_read_color(pi, x);
if (pi->ynow < ymax)
pic2_arith_expand_chain(pi, x, pi->ynow, cc);
} else
pi->vram_now[x] = cc;
}
if (line != NULL)
*line = pi->vram_now;
pi->ynow++;
pic2_handle_para(pi, 1);
return (pi->ynow - 1);
}
static int pic2_arith_loader_init(pi)
struct pic2_info *pi;
{
unsigned short p2b[256];
int i, xw;
pi->ynow = 0;
/* check the color depth */
if (pi->header->depth % 3)
pic2_error(pi, PIC2_DEPTH);
/* set function for extract next line */
pi->next_line = pic2_arith_expand_line;
/* clear cache and flags */
xw = pi->block->x_wid;
xvbzero((char *) pi->cache, 8 * 8 * 8 * sizeof(pi->cache[0]));
xvbzero((char *) pi->cache_pos, 8 * 8 * 8 * sizeof(pi->cache_pos[0]));
xvbzero((char *) pi->flag_now, xw * sizeof(pi->flag_now[0]));
xvbzero((char *) pi->flag2_now, 8 + xw * sizeof(pi->flag2_now[0]));
xvbzero((char *) pi->flag2_next, 8 + xw * sizeof(pi->flag2_next[0]));
/* go to picture data field */
pic2_seek_file(pi, pi->block_pos + PIC2_BLOCK_HEADER_SIZE, SEEK_SET);
/* clear bit field marker */
pi->bs.rest = 0;
pi->bs.cur = 0;
/* read probability table */
for (i = 0; i < PIC2_ARITH_CONTEXT; i++)
p2b[i] = pic2_read_short(pi);
/* make multiplication table */
for (i = 0; i < 16384; i++) {
pi->mulu_tab[i] = (long) (i / 128 + 128) * (int) p2b[i & 127] / 256;
if (pi->mulu_tab[i] == 0) pi->mulu_tab[i] = 1;
}
/* initialize some valuables */
pi->aa = 0xffff;
pi->dd = 0;
for (i = 0; i < 16; i++) {
pi->dd *= 2;
if (pic2_read_bits(pi, 1))
pi->dd |= 1;
}
pi->cache_hit_c = 16;
return (0);
}
/*
* These functions are fast pic2 compression extractor.
*/
static int pic2_fast_read_length(pi)
struct pic2_info *pi;
{
int a;
a = 0;
while (pic2_read_bits(pi, 1)) {
a++;
}
if (a == 0)
return (0);
return (pic2_read_bits(pi, a) + (1 << a) - 1);
}
static void pic2_fast_expand_chain(pi, x, cc)
struct pic2_info *pi;
int x;
pixel cc;
{
if (pic2_read_bits(pi, 1) != 0) {
if (pic2_read_bits(pi, 1) != 0) { /* down */
pi->vram_next[x] = cc;
pi->flag_next[x] = -1;
} else if (pic2_read_bits(pi, 1) != 0) {
if (pic2_read_bits(pi, 1) == 0) { /* left2down */
pi->vram_next[x - 2] = cc;
pi->flag_next[x - 2] = -1;
} else { /* left1down */
pi->vram_next[x - 1] = cc;
pi->flag_next[x - 1] = -1;
}
} else {
if (pic2_read_bits(pi, 1) == 0) { /* right2down */
pi->vram_next[x + 2] = cc;
pi->flag_next[x + 2] = -1;
} else { /* left1down */
pi->vram_next[x + 1] = cc;
pi->flag_next[x + 1] = -1;
}
}
}
}
static pixel pic2_fast_read_color(pi, bc)
struct pic2_info *pi;
pixel bc;
{
pixel cc;
unsigned short j, k, m;
short depth, colbits;
pixel (*cache)[PIC2_FAST_CACHE];
depth = pi->header->depth;
colbits = depth / 3;
cache = (pixel (*)[PIC2_FAST_CACHE]) pi->cache;
bc = pic2_exchange_rg(bc, colbits);
k = pic2_shift_bits(bc, 8 - depth);
if (pic2_read_bits(pi, 1) == 0) {
pi->cache_pos[k] = m = (pi->cache_pos[k] - 1) & (PIC2_FAST_CACHE - 1);
cc = pic2_read_bits(pi, depth);
cc = pic2_exchange_rg(cc, colbits);
cache[k][m] = cc;
} else {
j = pic2_read_bits(pi, 6); /* 6= log2(PIC2_FAST_CACHE) */
m = pi->cache_pos[k];
cc = cache[k][(m + j) & (PIC2_FAST_CACHE - 1)];
}
return (cc);