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pcx.c
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#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <string.h>
#include <ctype.h>
#include "defs.h"
#include "externs.h"
#include "protos.h"
#define uEOF ((unsigned int)EOF)
/* globals */
char pcx_name[128]; /* pcx file name */
int pcx_w, pcx_h; /* pcx dimensions */
int pcx_nb_colors; /* number of colors in the pcx */
int pcx_nb_args; /* number of argument */
unsigned int pcx_arg[8]; /* pcx args array */
unsigned char *pcx_buf; /* pointer to the pcx buffer */
unsigned char pcx_pal[256][3]; /* palette */
unsigned char pcx_plane[128][4]; /* plane buffer */
unsigned int tile_offset; /* offset in the tile reference table */
struct t_tile tile[256]; /* tile info table */
struct t_tile *tile_tbl[256]; /* tile hash table */
struct t_symbol *tile_lablptr; /* tile symbol reference */
struct PCX_HEADER { /* pcx file header */
unsigned char manufacturer, version;
unsigned char encoding;
unsigned char bpp;
unsigned char xmin[2], ymin[2], xmax[2], ymax[2];
unsigned char xdpi[2], ydpi[2];
unsigned char colormap[16][3];
unsigned char reserved;
unsigned char np;
unsigned char bytes_per_line[2];
unsigned char palette_info[2];
unsigned char xscreen[2], yscreen[2];
unsigned char pad[54];
} pcx;
/* externs */
extern struct t_symbol *expr_lablptr; /* pointer to the lastest label */
extern int expr_lablcnt; /* number of label seen in an expression */
/* macros */
#define GET_SHORT(a) ((a[1] << 8) + a[0])
/* ----
* pcx_pack_8x8_tile()
* ----
*/
int
pcx_pack_8x8_tile(unsigned char *buffer, int x, int y)
{
unsigned char *ptr;
/* tile address */
ptr = pcx_buf + x + (y * pcx_w);
/* encode the tile */
return (machine->pack_8x8_tile(buffer, ptr, pcx_w, CHUNKY_TILE));
}
/* ----
* pcx_pack_16x16_tile()
* ----
*/
int
pcx_pack_16x16_tile(unsigned char *buffer, int x, int y)
{
unsigned char *ptr;
/* tile address */
ptr = pcx_buf + x + (y * pcx_w);
/* encode the tile */
return (machine->pack_16x16_tile(buffer, ptr, pcx_w, CHUNKY_TILE));
}
/* ----
* pcx_pack_16x16_sprite()
* ----
*/
int
pcx_pack_16x16_sprite(unsigned char *buffer, int x, int y)
{
unsigned char *ptr;
/* sprite address */
ptr = pcx_buf + x + (y * pcx_w);
/* encode the sprite */
return (machine->pack_16x16_sprite(buffer, ptr, pcx_w, CHUNKY_TILE));
}
/* ----
* pcx_set_tile()
* ----
*/
int
pcx_set_tile(struct t_symbol *ref, unsigned int offset)
{
int i;
int hash;
int size, start;
unsigned int crc;
unsigned char *data;
int nb;
/* do nothing in first passes */
if (pass != LAST_PASS)
return (1);
/* same tile set? */
if (ref == NULL)
return (1);
if ((ref == tile_lablptr) && (offset == tile_offset))
return (1);
/* check symbol */
if (ref->nb == 0) {
if ((ref->type == IFUNDEF) || (ref->type == UNDEF))
error("Tile table undefined!");
else
error("Incorrect tile table reference!");
/* no tile table */
tile_lablptr = NULL;
return (1);
}
if (ref->size == 0) {
error("Tile table has not been compiled yet!");
tile_lablptr = NULL;
return (1);
}
/* adjust offset */
start = (offset - ref->value);
if ((start < 0))
goto err;
if ((start % ref->size) != 0)
goto err;
if ((start / ref->size) >= ref->nb)
goto err;
/* reset tile hash table */
for (i = 0; i < 256; i++)
tile_tbl[i] = NULL;
/* get infos */
nb = ref->nb - (start / ref->size);
size = ref->size;
data = &rom[ref->bank - bank_base][ref->value & 0x1FFF] + start;
/* 256 tiles max */
if (nb > 256)
nb = 256;
/* parse tiles */
for (i = 0; i < nb; i++) {
/* calculate tile crc */
crc = crc_calc(data, size);
hash = (crc & 0xFF);
/* insert the tile in the tile table */
tile[i].next = tile_tbl[hash];
tile[i].index = i;
tile[i].data = data;
tile[i].crc = crc;
tile_tbl[hash] = &tile[i];
/* next */
data += size;
}
/* ok */
tile_lablptr = ref;
tile_offset = offset;
return (1);
/* error */
err:
tile_lablptr = NULL;
error("Incorrect tile table reference!");
return (1);
}
/* ----
* pcx_search_tile()
* ----
*/
int
pcx_search_tile(unsigned char *data, int size)
{
struct t_tile *tile;
unsigned int crc;
/* do nothing in first passes */
if (pass != LAST_PASS)
return (0);
/* quick check */
if (tile_lablptr == NULL)
return (-1);
if (tile_lablptr->size != size)
return (-1);
/* calculate tile crc */
crc = crc_calc(data, size);
tile = tile_tbl[crc & 0xFF];
/* search tile */
while (tile) {
if (tile->crc == crc) {
if (memcmp(tile->data, data, size) == 0)
return(tile->index);
}
tile = tile->next;
}
/* not found */
return (-1);
}
/* ----
* pcx_get_args()
* ----
* get arguments in pcx pseudo instructions (.incchr/spr/tile/pal/bat)
*/
int
pcx_get_args(int *ip)
{
char name[128];
char c;
/* get pcx file name */
if (!getstring(ip, name, 127))
return (0);
/* reset args counter */
pcx_nb_args = 0;
/* get args */
for (;;) {
/* skip spaces */
while (isspace(c = prlnbuf[(*ip)++]));
/* check syntax */
if ((c != ',') && (c != ';') && (c != 0)) {
error("Syntax error!");
return (0);
}
if (c != ',')
break;
/* get arg */
if (!evaluate(ip, 0))
return (0);
/* store arg */
pcx_arg[pcx_nb_args++] = value;
/* check number of args */
if (pcx_nb_args == 7)
break;
}
/* check number of args */
if (optype & (1 << pcx_nb_args)) {
error("Invalid number of arguments!");
return (0);
}
/* load and unpack the pcx */
if (!pcx_load(name))
return (0);
/* parse tiles */
if (opval == P_INCMAP) {
if (expr_lablcnt == 0)
error("No tile table reference!");
if (expr_lablcnt > 1) {
expr_lablcnt = 0;
error("Too many tile table references!");
}
if (!pcx_set_tile(expr_lablptr, value))
return (0);
}
/* ok */
return (1);
}
/* ----
* pcx_parse_args()
* ----
* parse arguments of pcx pseudo directive
*/
int
pcx_parse_args(int i, int nb, int *a, int *b, int *c, int *d, int size)
{
int x, y, w, h;
x = 0;
y = 0;
/* get coordinates */
if (nb == 0) { /* no arg */
w = (pcx_w / size);
h = (pcx_h / size);
}
else if (nb == 2) { /* 2 args */
w = pcx_arg[i];
h = pcx_arg[i+1];
}
else { /* 4 args */
x = pcx_arg[i];
y = pcx_arg[i+1];
w = pcx_arg[i+2];
h = pcx_arg[i+3];
}
/* check */
if (((x + w * size) > pcx_w) || ((y + h * size) > pcx_h)) {
error("Coordinates out of range!");
return (0);
}
/* write back the value */
*a = x;
*b = y;
*c = w;
*d = h;
/* ok */
return (1);
}
/* ----
* pcx_load()
* ----
* load a PCX file and unpack it
*/
int
pcx_load(char *name)
{
FILE *f;
/* check if the file is the same as the previously loaded one;
* if this is the case do not reload it
*/
if (strlen(name) && (strcasecmp(pcx_name, name) == 0))
return (1);
else {
/* no it's a new file - ok let's prepare loading */
if (pcx_buf)
free(pcx_buf);
pcx_buf = NULL;
pcx_name[0] = '\0';
}
/* open the file */
if ((f = open_file(name, "rb")) == NULL) {
error("Can not open file!");
return (0);
}
/* get the picture size */
fread(&pcx, 128, 1, f);
pcx_w = (GET_SHORT(pcx.xmax) - GET_SHORT(pcx.xmin) + 1);
pcx_h = (GET_SHORT(pcx.ymax) - GET_SHORT(pcx.ymin) + 1);
/* adjust picture width */
if (pcx_w & 0x01)
pcx_w++;
/* check size range */
if ((pcx_w > 1024) || (pcx_h > 768)) {
error("Picture size too big, max. 1024x768!");
return (0);
}
if ((pcx_w < 16) || (pcx_h < 16)) {
error("Picture size too small, min. 16x16!");
return (0);
}
/* malloc a buffer */
pcx_buf = malloc(pcx_w * pcx_h);
if (pcx_buf == NULL) {
error("Can not load file, not enough memory!");
return (0);
}
/* decode the picture */
if ((pcx.bpp == 8) && (pcx.np == 1))
decode_256(f, pcx_w, pcx_h);
else if ((pcx.bpp == 1) && (pcx.np <= 4))
decode_16(f, pcx_w, pcx_h);
else {
error("Unsupported or invalid PCX format!");
return (0);
}
fclose(f);
strcpy(pcx_name, name);
return (1);
}
/* ----
* decode_256()
* ----
* decode a 256 colors PCX file
*/
void
decode_256(FILE *f, unsigned int w, unsigned int h)
{
unsigned int i, c, x, y;
unsigned char *ptr;
ptr = pcx_buf;
x = 0;
y = 0;
/* decode */
switch (pcx.encoding) {
case 0:
/* raw */
fread(pcx_buf, w, h, f);
c = fgetc(f);
return;
case 1:
/* simple run-length encoding */
do {
c = fgetc(f);
if (c == uEOF)
break;
if ((c & 0xC0) != 0xC0)
i = 1;
else {
i = (c & 0x3F);
c = fgetc(f);
}
do {
x++;
*ptr++ = c;
if (x == w) {
x = 0;
y++;
}
} while (--i);
} while (y < h);
break;
default:
error("Unsupported PCX encoding scheme!");
return;
}
/* get the palette */
if (c != uEOF)
c = fgetc(f);
while ((c != 12) && (c != uEOF))
c = fgetc(f);
if (c == 12)
fread(pcx_pal, 768, 1, f);
/* number of colors */
pcx_nb_colors = 256;
}
/* ----
* decode_16()
* ----
* decode a 16 (or less) colors PCX file
*/
void
decode_16(FILE *f, unsigned int w, unsigned int h)
{
int k;
unsigned int i, j, n;
unsigned int x, y, p;
unsigned int c, pix;
unsigned char *ptr;
ptr = pcx_buf;
x = 0;
y = 0;
p = 0;
/* decode */
switch (pcx.encoding) {
case 0:
/* raw */
error("Unsupported PCX encoding scheme!");
break;
case 1:
/* simple run-length encoding */
do {
/* get a char */
c = fgetc(f);
if (c == uEOF)
break;
/* check if it's a repeat command */
if ((c & 0xC0) != 0xC0)
i = 1;
else {
i = (c & 0x3F);
c = fgetc(f);
}
/* unpack */
do {
pcx_plane[x >> 3][p] = c;
x += 8;
/* end of line */
if (x >= w) {
x = 0;
p++;
/* plane to chunky conversion */
if (p == pcx.np) {
p = 0;
n = (w + 7) >> 3;
y++;
/* loop */
for (j = 0; j < n; j++) {
for (k = 7; k >= 0; k--) {
/* get pixel index */
pix = 0;
switch (pcx.np) {
case 4:
pix |= ((pcx_plane[j][3] >> k) & 0x01) << 3;
case 3:
pix |= ((pcx_plane[j][2] >> k) & 0x01) << 2;
case 2:
pix |= ((pcx_plane[j][1] >> k) & 0x01) << 1;
case 1:
pix |= ((pcx_plane[j][0] >> k) & 0x01);
break;
}
/* store pixel */
if (x < w)
*ptr++ = pix;
x++;
}
}
x = 0;
}
}
}
while (--i);
}
while (y < h);
break;
default:
error("Unsupported PCX encoding scheme!");
return;
}
/* get the palette */
memset(pcx_pal, 0, 768);
memcpy(pcx_pal, pcx.colormap, (1 << pcx.np) * 3);
/* number of colors */
pcx_nb_colors = 16;
}