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gimp/plug-ins/faxg3/faxg3.c

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/* This is a plugin for the GIMP.
*
* Copyright (C) 1997 Jochen Friedrich
* Parts Copyright (C) 1995 Gert Doering
* Parts Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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.
*/
#include "config.h"
#include <glib.h> /* For G_OS_WIN32 */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#include <string.h>
#include <fcntl.h>
#ifdef G_OS_WIN32
#include <io.h>
#endif
#ifndef _O_BINARY
#define _O_BINARY 0
#endif
#include <libgimp/gimp.h>
#include "g3.h"
#include "libgimp/stdplugins-intl.h"
#define VERSION "0.6"
/* Declare local functions.
*/
static void query (void);
static void run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals);
static gint32 load_image (const gchar *filename);
static gint32 emitgimp (gint hcol,
gint row,
const gchar *bitmap,
gint bperrow,
const gchar *filename);
GimpPlugInInfo PLUG_IN_INFO =
{
NULL, /* init_proc */
NULL, /* quit_proc */
query, /* query_proc */
run, /* run_proc */
};
MAIN ()
void query (void)
{
static GimpParamDef load_args[] =
{
{ GIMP_PDB_INT32, "run_mode", "Interactive, non-interactive" },
{ GIMP_PDB_STRING, "filename", "The name of the file to load" },
{ GIMP_PDB_STRING, "raw_filename", "The name of the file to load" },
};
static GimpParamDef load_return_vals[] =
{
{ GIMP_PDB_IMAGE, "image", "Output image" },
};
gimp_install_procedure ("file_faxg3_load",
"loads g3 fax files",
"This plug-in loads Fax G3 Image files.",
"Jochen Friedrich",
"Jochen Friedrich, Gert Doering, Spencer Kimball & Peter Mattis",
VERSION,
"<Load>/Fax G3",
NULL,
GIMP_PLUGIN,
G_N_ELEMENTS (load_args),
G_N_ELEMENTS (load_return_vals),
load_args, load_return_vals);
gimp_register_magic_load_handler ("file_faxg3_load",
"g3",
"",
"0,short,0x0001,0,short,0x0014");
}
static void
run (const gchar *name,
gint nparams,
const GimpParam *param,
gint *nreturn_vals,
GimpParam **return_vals)
{
static GimpParam values[2];
GimpRunMode run_mode;
gint32 image_ID;
run_mode = param[0].data.d_int32;
*nreturn_vals = 1;
*return_vals = values;
values[0].type = GIMP_PDB_STATUS;
values[0].data.d_status = GIMP_PDB_CALLING_ERROR;
if (strcmp (name, "file_faxg3_load") == 0)
{
INIT_I18N();
*nreturn_vals = 2;
image_ID = load_image (param[1].data.d_string);
values[1].type = GIMP_PDB_IMAGE;
values[1].data.d_image = image_ID;
if (image_ID != -1)
{
values[0].data.d_status = GIMP_PDB_SUCCESS;
}
else
{
values[0].data.d_status = GIMP_PDB_EXECUTION_ERROR;
}
}
}
#ifdef DEBUG
void putbin (unsigned long d )
{
unsigned long i = 0x80000000;
while ( i!=0 )
{
putc( ( d & i ) ? '1' : '0', stderr );
i >>= 1;
}
putc( '\n', stderr );
}
#endif
static int byte_tab[ 256 ];
/* static int o_stretch; */ /* -stretch: double each line */
/* static int o_stretch_force=-1; */ /* -1: guess from filename */
/* static int o_lj; */ /* -l: LJ output */
/* static int o_turn; */ /* -t: turn 90 degrees right */
struct g3_tree * black, * white;
#define CHUNK 2048;
static char rbuf[2048]; /* read buffer */
static int rp; /* read pointer */
static int rs; /* read buffer size */
#define MAX_ROWS 4300
#define MAX_COLS 1728 /* !! FIXME - command line parameter */
static gint32
load_image (const gchar *filename)
{
int data;
int hibit;
struct g3_tree * p;
int nr_pels;
int fd;
int color;
int i, rr, rsize;
int cons_eol;
gint32 image_id;
gint bperrow = MAX_COLS/8; /* bytes per bit row */
gchar *bitmap; /* MAX_ROWS by (bperrow) bytes */
gchar *bp; /* bitmap pointer */
gchar *name;
gint row;
gint max_rows; /* max. rows allocated */
gint col, hcol; /* column, highest column ever used */
name = g_strdup_printf (_("Opening '%s'..."),
gimp_filename_to_utf8 (filename));
gimp_progress_init (name);
g_free (name);
/* initialize lookup trees */
build_tree( &white, t_white );
build_tree( &white, m_white );
build_tree( &black, t_black );
build_tree( &black, m_black );
init_byte_tab( 0, byte_tab );
fd = open (filename, O_RDONLY | _O_BINARY);
if (fd < 0)
{
g_message (_("Could not open '%s' for reading: %s"),
gimp_filename_to_utf8 (filename), g_strerror (errno));
return -1;
}
hibit = 0;
data = 0;
cons_eol = 0; /* consecutive EOLs read - zero yet */
color = 0; /* start with white */
rr = 0;
rsize = lseek(fd, 0L, SEEK_END);
lseek(fd, 0L, 0);
rs = read( fd, rbuf, sizeof(rbuf) );
if ( rs < 0 ) { perror( "read" ); close( rs ); exit(8); }
rr += rs;
gimp_progress_update ((float)rr/rsize/2.0);
/* skip GhostScript header */
rp = ( rs >= 64 && strcmp( rbuf+1, "PC Research, Inc" ) == 0 ) ? 64 : 0;
/* initialize bitmap */
row = col = hcol = 0;
bitmap = g_new0 (gchar, ( max_rows = MAX_ROWS ) * MAX_COLS / 8 );
bp = &bitmap[ row * MAX_COLS/8 ];
while ( rs > 0 && cons_eol < 4 ) /* i.e., while (!EOF) */
{
#ifdef DEBUG
fprintf( stderr, "hibit=%2d, data=", hibit );
putbin( data );
#endif
while ( hibit < 20 )
{
data |= ( byte_tab[ (int) (unsigned char) rbuf[ rp++] ] << hibit );
hibit += 8;
if ( rp >= rs )
{
rs = read( fd, rbuf, sizeof( rbuf ) );
if ( rs < 0 ) { perror( "read2"); break; }
rr += rs;
gimp_progress_update ((float)rr/rsize/2.0);
rp = 0;
if ( rs == 0 ) { goto do_write; }
}
#ifdef DEBUG
fprintf( stderr, "hibit=%2d, data=", hibit );
putbin( data );
#endif
}
if ( color == 0 ) /* white */
p = white->nextb[ data & BITM ];
else /* black */
p = black->nextb[ data & BITM ];
while ( p != NULL && ! ( p->nr_bits ) )
{
data >>= FBITS;
hibit -= FBITS;
p = p->nextb[ data & BITM ];
}
if ( p == NULL ) /* invalid code */
{
fprintf( stderr, "invalid code, row=%d, col=%d, file offset=%lx, skip to eol\n",
row, col, (unsigned long) lseek( fd, 0, 1 ) - rs + rp );
while ( ( data & 0x03f ) != 0 )
{
data >>= 1; hibit--;
if ( hibit < 20 )
{
data |= ( byte_tab[ (int) (unsigned char) rbuf[ rp++] ] << hibit );
hibit += 8;
if ( rp >= rs ) /* buffer underrun */
{ rs = read( fd, rbuf, sizeof( rbuf ) );
if ( rs < 0 ) { perror( "read4"); break; }
rr += rs;
gimp_progress_update ((float)rr/rsize/2.0);
rp = 0;
if ( rs == 0 ) goto do_write;
}
}
}
nr_pels = -1; /* handle as if eol */
}
else /* p != NULL <-> valid code */
{
data >>= p->nr_bits;
hibit -= p->nr_bits;
nr_pels = ( (struct g3_leaf *) p ) ->nr_pels;
#ifdef DEBUG
fprintf( stderr, "PELs: %d (%c)\n", nr_pels, '0'+color );
#endif
}
/* handle EOL (including fill bits) */
if ( nr_pels == -1 )
{
#ifdef DEBUG
fprintf( stderr, "hibit=%2d, data=", hibit );
putbin( data );
#endif
/* skip filler 0bits -> seek for "1"-bit */
while ( ( data & 0x01 ) != 1 )
{
if ( ( data & 0xf ) == 0 ) /* nibble optimization */
{
hibit-= 4; data >>= 4;
}
else
{
hibit--; data >>= 1;
}
/* fill higher bits */
if ( hibit < 20 )
{
data |= ( byte_tab[ (int) (unsigned char) rbuf[ rp++] ] << hibit );
hibit += 8;
if ( rp >= rs ) /* buffer underrun */
{ rs = read( fd, rbuf, sizeof( rbuf ) );
if ( rs < 0 ) { perror( "read3"); break; }
rr += rs;
gimp_progress_update ((float)rr/rsize/2.0);
rp = 0;
if ( rs == 0 ) goto do_write;
}
}
#ifdef DEBUG
fprintf( stderr, "hibit=%2d, data=", hibit );
putbin( data );
#endif
} /* end skip 0bits */
hibit--; data >>=1;
color=0;
if ( col == 0 )
cons_eol++; /* consecutive EOLs */
else
{
if ( col > hcol && col <= MAX_COLS ) hcol = col;
row++;
/* bitmap memory full? make it larger! */
if ( row >= max_rows )
{
char * p = (char *) realloc( bitmap,
( max_rows += 500 ) * MAX_COLS/8 );
if ( p == NULL )
{
perror( "realloc() failed, page truncated" );
rs = 0;
}
else
{
bitmap = p;
memset( &bitmap[ row * MAX_COLS/8 ], 0,
( max_rows - row ) * MAX_COLS/8 );
}
}
col=0; bp = &bitmap[ row * MAX_COLS/8 ];
cons_eol = 0;
}
}
else /* not eol */
{
if ( col+nr_pels > MAX_COLS ) nr_pels = MAX_COLS - col;
if ( color == 0 ) /* white */
col += nr_pels;
else /* black */
{
register int bit = ( 0x80 >> ( col & 07 ) );
register char *w = & bp[ col>>3 ];
for ( i=nr_pels; i > 0; i-- )
{
*w |= bit;
bit >>=1; if ( bit == 0 ) { bit = 0x80; w++; }
col++;
}
}
if ( nr_pels < 64 ) color = !color; /* terminating code */
}
} /* end main loop */
do_write: /* write pbm (or whatever) file */
if( fd != 0 ) close(fd); /* close input file */
#ifdef DEBUG
fprintf( stderr, "consecutive EOLs: %d, max columns: %d\n", cons_eol, hcol );
#endif
image_id = emitgimp (hcol, row, bitmap, bperrow, filename);
g_free (bitmap);
return image_id;
}
/* hcol is the number of columns, row the number of rows
* bperrow is the number of bytes actually used by hcol, which may
* be greater than (hcol+7)/8 [in case of an unscaled g3 image less
* than 1728 pixels wide]
*/
static gint32
emitgimp (gint hcol,
gint row,
const gchar *bitmap,
gint bperrow,
const gchar *filename)
{
GimpPixelRgn pixel_rgn;
GimpDrawable *drawable;
gint32 image_ID;
gint32 layer_ID;
guchar *buf;
guchar tmp;
gint x,y,xx,yy,tile_height;
/* initialize */
tmp = 0;
#ifdef DEBUG
fprintf( stderr, "emit gimp: %d x %d\n", hcol, row);
#endif
image_ID = gimp_image_new (hcol, row, GIMP_GRAY);
gimp_image_set_filename (image_ID, filename);
layer_ID = gimp_layer_new (image_ID, _("Background"),
hcol,
row,
GIMP_GRAY_IMAGE, 100, GIMP_NORMAL_MODE);
gimp_image_add_layer (image_ID, layer_ID, 0);
drawable = gimp_drawable_get (layer_ID);
gimp_pixel_rgn_init (&pixel_rgn, drawable,
0, 0, drawable->width, drawable->height, TRUE, FALSE);
tile_height = gimp_tile_height ();
#ifdef DEBUG
fprintf( stderr, "tile height: %d\n", tile_height);
#endif
buf = g_new (guchar, hcol*tile_height);
xx=0;
yy=0;
for (y=0; y<row; y++) {
for (x=0; x<hcol; x++) {
if ((x&7)==0) tmp = bitmap[y*bperrow+(x>>3)];
buf[xx++]=tmp&(128>>(x&7))?0:255;
}
if ((y-yy) == tile_height-1) {
#ifdef DEBUG
fprintf( stderr, "update tile height: %d\n", tile_height);
#endif
gimp_pixel_rgn_set_rect (&pixel_rgn, buf, 0, yy, hcol, tile_height);
gimp_progress_update (0.5+(float)y/row/2.0);
xx=0;
yy += tile_height;
}
}
if (row-yy) {
#ifdef DEBUG
fprintf( stderr, "update rest: %d\n", row-yy);
#endif
gimp_pixel_rgn_set_rect (&pixel_rgn, buf, 0, yy, hcol, row-yy);
}
gimp_progress_update (1.0);
g_free (buf);
gimp_drawable_flush (drawable);
return image_ID;
}
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