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TO_PCX.C
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C/C++ Source or Header
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1993-04-18
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7KB
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263 lines
/*
Copyright (c) 1991 - 1993 Heinz W. Werntges. All rights reserved.
Distributed by Free Software Foundation, Inc.
This file is part of HP2xx.
HP2xx is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer
to the GNU General Public License, Version 2 or later, for full details.
Everyone is granted permission to copy, modify and redistribute
HP2xx, but only under the conditions described in the GNU General Public
License. A copy of this license is supposed to have been
given to you along with HP2xx so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
/** to_pcx.c: PCX converter part of project "hp2xx"
**
** 91/01/19 V 1.00 HWW Originating: Format accepted by MS-Paintbrush,
** but not by emTeX drivers
** Use MS-Paintbrush "load/save" for conversion
** 91/02/15 V 1.01 HWW VAX_C support added (not tested yet!)
** 91/02/18 V 1.02 HWW PCX format: no zero run length allowed
** 91/02/20 V 1.03 HWW Some VAX_C changes, debugged
** 91/06/09 V 1.04 HWW New options added
** 91/06/16 V 1.05 HWW Writing of PCX header now machine-independent
** 91/10/15 V 1.06 HWW ANSI_C
** 91/10/25 V 1.07 HWW VAX: fopen() augmentations used, open() removed
** 92/05/17 V 1.07b HWW Output to stdout if outfile == '-'
** 92/05/19 V 1.07c HWW Abort if color mode
** 92/06/08 V 1.08a HWW First color version
**
** NOTE: According to my tests, setting of the
** color lookup table is ignored by other programs,
** so this code is *preliminary* when color is used.
** Correct colors appeared only if the color setting corresponded to
** PC conventions...
**/
#include <stdio.h>
#include <stdlib.h>
#include "bresnham.h"
#include "hp2xx.h"
typedef enum {PCX_INIT, PCX_NORMAL, PCX_EXIT}
PCXmode;
void RLEcode_to_file (int c, int repeat, FILE *fd)
{
if ((repeat==1) && ((c & 0xC0) != 0xC0))
{
if (putc (c, fd) == EOF)
{
perror("RLEcode_to_file (1)");
exit (ERROR);
}
}
else
{
if (putc (repeat | 0xC0, fd) == EOF)
{
perror("RLEcode_to_file (2)");
exit (ERROR);
}
if (putc (c, fd) == EOF)
{
perror("RLEcode_to_file (3)");
exit (ERROR);
}
}
}
void byte_to_PCX (Byte b, PCXmode mode, FILE *fd)
{
static last_b, rept;
switch (mode)
{
case PCX_NORMAL:
if (b == last_b)
{
if (++rept == 63)
{
RLEcode_to_file (last_b, rept, fd);
rept = 0;
}
}
else
{
if (rept)
RLEcode_to_file (last_b, rept, fd);
rept = 1;
last_b = b;
}
break;
case PCX_INIT:
rept = 0;
last_b = -2; /* Init to impossible value */
break;
case PCX_EXIT:
if (rept)
{
RLEcode_to_file (last_b, rept, fd);
rept = 0;
}
break;
}
}
typedef struct {
char creator, version, encoding, bits;
short xmin, ymin, xmax, ymax, hres, vres;
char palette[16][3], vmode, planes;
short byteperline, paletteinfo;
char dummy[58];
} PCXheader;
void start_PCX (PAR *p, PicBuf *picbuf, FILE *fd)
{
PCXheader h;
int i, j;
h.creator = 0x0A; /* ZSoft label */
h.version = '\003'; /* V 2.8/3.0, no palette info */
h.encoding = 1; /* RLE */
h.bits = 1; /* Bits per pixel */
h.xmin = 0; /* Range of bitmap */
h.ymin = 0;
h.xmax = picbuf->nc - 1;
h.ymax = picbuf->nr - 1;
h.hres = p->dpi_x; /* Resolution */
h.vres = p->dpi_y;
for (i=0; i<8; i++)
for (j=0; j<3; j++)
{
h.palette[i ][j] = p->Clut[i][j];
h.palette[i+8][j] = p->Clut[i][j];
}
h.vmode = 0; /* Reserved */
h.planes = picbuf->depth;/* Number of color planes */
h.byteperline = picbuf->nb; /* Number of bytes per line */
h.paletteinfo = 1; /* 1 = color & b/w, 2 = gray scale */
for (i=0; i<58; ) /* Filler for a max. of 128 bytes */
{
h.dummy[i++] = 'H';
h.dummy[i++] = 'W';
}
/**
** For complete machine independence, a bytewise writing of this header
** is mandatory. Else, fill bytes or HIGH/LOW-endian machines must be
** considered. A simple "fwrite(h,128,1,fd)" may not suffice!
**/
if (fputc (h.creator, fd) == EOF) goto ERROR_EXIT;
if (fputc (h.version, fd) == EOF) goto ERROR_EXIT;
if (fputc (h.encoding,fd) == EOF) goto ERROR_EXIT;
if (fputc (h.bits, fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.xmin & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.xmin >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.ymin & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.ymin >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.xmax & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.xmax >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.ymax & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.ymax >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.hres & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.hres >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.vres & 0xff), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.vres >> 8), fd) == EOF) goto ERROR_EXIT;
if (fwrite((VOID *) h.palette,48,1,fd) != 1) goto ERROR_EXIT;
if (fputc (h.vmode, fd) == EOF) goto ERROR_EXIT;
if (fputc (h.planes, fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.byteperline & 0xff),fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.byteperline >> 8), fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.paletteinfo & 0xff),fd) == EOF) goto ERROR_EXIT;
if (fputc ((h.paletteinfo >> 8), fd) == EOF) goto ERROR_EXIT;
if (fwrite((VOID *) h.dummy,58,1,fd) != 1) goto ERROR_EXIT;
return;
ERROR_EXIT:
perror ("start_PCX");
free_PicBuf (picbuf, p->swapfile);
exit (ERROR);
}
void PicBuf_to_PCX (PicBuf *picbuf, PAR *p)
{
FILE *fd;
RowBuf *row;
int row_c, np, x;
Byte *pb;
if (!p->quiet)
fprintf(stderr, "\nWriting PCX output\n");
if (*p->outfile != '-')
{
#ifdef VAX
if ((fd = fopen(p->outfile, WRITE_BIN, "rfm=var","mrs=512")) == NULL)
{
#else
if ((fd = fopen(p->outfile, WRITE_BIN)) == NULL)
{
#endif
perror ("hp2xx -- opening output file");
free_PicBuf (picbuf, p->swapfile);
exit (ERROR);
}
}
else fd = stdout;
start_PCX (p, picbuf, fd);
/* Backward since highest index is lowest line on screen! */
for (row_c = picbuf->nr - 1; row_c >= 0; row_c--)
{
if ((!p->quiet) && (row_c % 10 == 0))
/* For the impatients among us ... */
putc('.',stderr);
row = get_RowBuf (picbuf, row_c);
byte_to_PCX (0, PCX_INIT, fd);
pb = row->buf;
for (np=0; np < picbuf->depth; np++)
for (x=0; x < picbuf->nb; x++)
byte_to_PCX (~*pb++, PCX_NORMAL, fd);
byte_to_PCX (0, PCX_EXIT, fd); /* Flush */
}
if (p->is_color && !p->quiet)
fprintf(stderr,"WARNING: PCX colors may (yet) be arbitrary!\n");
if (!p->quiet)
fputc ('\n', stderr);
if (fd != stdout)
fclose (fd);
}