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xvpic.c
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xvpic.c
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/*
* xvpic.c - load routine for `PIC' format pictures.
*
* The `PIC' format is used by many Japanese personal computer users.
*/
#include "xv.h"
#include <setjmp.h>
#ifdef HAVE_PIC
typedef unsigned short data16;
typedef unsigned int data32;
struct pic_info {
jmp_buf jmp;
FILE *fp;
struct {
int rest;
byte cur;
}bs;
long fsize;
int type, mode;
int width, height;
float aspect;
int cbits;
int cmapped;
byte *cmap;
int cached;
struct cache_t {
int newest;
struct cachenode_t {
data32 dat;
int newer, older;
} *node;
} cache;
int g_bits, r_bits, b_bits, i_bits;
int inv_gr;
int tiled256;
int numcols;
int writing_grey;
data32 *data;
};
static void pic_open_file PARM((struct pic_info*,char*));
static void pic_check_id PARM((struct pic_info*));
static void pic_read_comment PARM((struct pic_info*, char**));
static void pic_read_header PARM((struct pic_info*));
static void pic_expand_data PARM((struct pic_info*));
static int pic_expanding_read_len PARM((struct pic_info*));
static data32 pic_expanding_read_color PARM((struct pic_info*));
static void pic_expanding_read_chain
PARM((struct pic_info*, int, int, data32));
static void pic_make_xvpic
PARM((struct pic_info*, byte**, byte*, byte*, byte*));
static void pic_write_id PARM((struct pic_info*));
static void pic_write_comment PARM((struct pic_info*, char*));
static void pic_write_header PARM((struct pic_info*));
static void pic_write_palette
PARM((struct pic_info*, byte*, byte*, byte*));
static void pic_make_sparse_data PARM((struct pic_info*, byte*));
static void pic_write_data PARM((struct pic_info*));
static void pic_write_length PARM((struct pic_info*, data32));
static void pic_write_color PARM((struct pic_info*, data32));
static void pic_write_chain
PARM((struct pic_info*, int, int, data32));
static data32 pic_read_rgb PARM((struct pic_info*));
static data32 pic_read_color_code PARM((struct pic_info*));
static void pic_write_rgb PARM((struct pic_info*, data32));
static void pic_write_color_code PARM((struct pic_info*, data32));
static void pic_cache_init PARM((struct pic_info*));
static data32 pic_cache_get_value PARM((struct pic_info*, int));
static void pic_cache_add_value PARM((struct pic_info*, data32));
static int pic_cache_lookup PARM((struct pic_info*, data32));
static data32 pic_read_bits PARM((struct pic_info*, int));
static void pic_write_bits PARM((struct pic_info*, data32, int));
static byte pic_pad_bit PARM((int, data32));
static void pic_init_info PARM((struct pic_info*));
static void pic_cleanup_pic_info PARM((struct pic_info*, int));
static void pic_cleanup_pinfo PARM((PICINFO*));
static void pic_memory_error PARM((char*, char*));
static void pic_error PARM((struct pic_info*, int));
static void pic_file_error PARM((struct pic_info*, int));
static void pic_file_warning PARM((struct pic_info*, int));
static void pic_show_pic_info PARM((struct pic_info*));
static void *pic_malloc PARM((size_t, char*));
static void *pic_realloc PARM((void*, size_t, char*));
static char *pic_id = "PIC";
/* Error Messages */
static char *pic_msgs[] = {
NULL,
#define PIC_OPEN 1
"can't open file.",
#define PIC_CORRUPT 2
"file corrupted.",
#define PIC_FORMAT 3
"not PIC format.",
#define PIC_SUPPORT 4
"unsupported type.",
#define PIC_COMMENT 5
"can't read comment.",
#define PIC_TYPE 6
"bad machine type.",
#define PIC_MODE 7
"bad machine-dependent mode.",
#define PIC_NUM_COLORS 8
"bad number of colors.",
#define PIC_SIZE 9
"bad size.",
#define PIC_ASPECT 10
"bad aspect.",
#define PIC_WRITE 11
"write failed.",
};
#define H4(b) (((b) >> 4) & 0x0f)
#define L4(b) ( (b) & 0x0f)
/* The main routine to load a PIC file. */
int LoadPIC(fname, pinfo)
char *fname;
PICINFO *pinfo;
{
int e;
struct pic_info pic;
char buf[128];
if(DEBUG) fputs("LoadPIC:\n", stderr);
pic_init_info(&pic);
pinfo->comment = NULL;
if((e = setjmp(pic.jmp)) != 0){
/* When an error occurs, comes here. */
pic_cleanup_pic_info(&pic, 0);
pic_cleanup_pinfo(pinfo);
if(DEBUG) fputs("\n", stderr);
return 0;
}
pic_open_file(&pic, fname);
pic_check_id(&pic);
pic_read_comment(&pic, &pinfo->comment);
pic_read_header(&pic);
pic_expand_data(&pic);
pic_make_xvpic(&pic, &pinfo->pic, pinfo->r, pinfo->g, pinfo->b);
pinfo->w = pic.width;
if(pic.tiled256)
pinfo->h = pic.height * 2;
else
pinfo->h = pic.height;
pinfo->normw = pinfo->w;
pinfo->normh = pinfo->h;
pinfo->type = pic.cmapped ? PIC8 : PIC24;
pinfo->frmType = F_PIC;
pinfo->colType = F_FULLCOLOR;
strcpy(pinfo->fullInfo, "PIC");
switch(pic.type){
case 0x0:
strcat(pinfo->fullInfo, ", X68k");
break;
case 0x1:
strcat(pinfo->fullInfo, ", PC-88VA");
if(pic.mode & 1)
strcat(pinfo->fullInfo, ", HR");
if(pic.mode & 2)
strcat(pinfo->fullInfo, ", tiled 256");
break;
case 0x2:
strcat(pinfo->fullInfo, ", FM-TOWNS");
if(pic.mode == 0x5){
strcat(pinfo->fullInfo, ", low-resolution");
}else{
strcat(pinfo->fullInfo, ", high-resolution");
}
break;
case 0x3:
strcat(pinfo->fullInfo, ", Macintosh");
break;
case 0xf:
;
}
sprintf(buf, " (%ld bytes)", pic.fsize);
strcat(pinfo->fullInfo, buf);
sprintf(pinfo->shrtInfo, "%dx%d(aspect %4.2f) PIC.",
pinfo->w, pinfo->h, pic.aspect);
if (!nopicadjust)
normaspect = pic.aspect;
pic_cleanup_pic_info(&pic, 0);
if(DEBUG) fputs("\n", stderr);
return 1;
}
static void pic_open_file(pi, fname)
struct pic_info *pi;
char *fname;
{
if((pi->fp = fopen(fname, "rb")) == NULL)
pic_file_error(pi, PIC_OPEN);
fseek(pi->fp, (size_t) 0, SEEK_END);
pi->fsize = ftell(pi->fp);
fseek(pi->fp, (size_t) 0, SEEK_SET);
}
static void pic_check_id(pi)
struct pic_info *pi;
{
char buf[3];
if(fread(buf, (size_t) 3, (size_t) 1, pi->fp) != 1)
pic_file_error(pi, PIC_CORRUPT);
if(strncmp(buf, pic_id, (size_t) 3) != 0)
pic_error(pi, PIC_FORMAT);
}
static void pic_read_comment(pi, comm)
struct pic_info *pi;
char **comm;
{
/* The comment field is like:
* comment-string ^Z dummy \0 \0
*/
int max = -1, i = 0;
int c;
while(1){
if((c = fgetc(pi->fp)) == EOF)
pic_file_error(pi, PIC_CORRUPT);
if(c == '\032') /* 0x1a, '^Z' */
break;
if(max < i){
max += 32;
*comm = pic_realloc(*comm, (size_t) max + 1, "pic_read_comment#1");
}
(*comm)[i++] = c;
}
if(max < i){
max++;
*comm = pic_realloc(*comm, (size_t) max + 1, "pic_read_comment#2");
}
(*comm)[i] = '\0';
while((c = fgetc(pi->fp)) != '\0'){ /* skip the dummy area */
if(c == EOF)
pic_file_error(pi, PIC_CORRUPT);
}
if(fgetc(pi->fp) != '\0') /* check the reserved byte */
pic_error(pi, PIC_SUPPORT);
}
static void pic_read_header(pi)
struct pic_info *pi;
{
pi->mode = pic_read_bits(pi, 4);
pi->type = pic_read_bits(pi, 4);
pi->cbits = pic_read_bits(pi, 16);
pi->width = pic_read_bits(pi, 16);
pi->height = pic_read_bits(pi, 16);
/* machine-dependent setup. */
switch(pi->type){
case 0x0: /* X68K */
if(pi->mode != 0)
pic_error(pi, PIC_MODE);
switch(pi->cbits){
case 4:
pi->aspect = 1.0;
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->i_bits = 1;
pi->cmapped = 1;
break;
case 8:
pi->aspect = 4.0 / 3.0;
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->i_bits = 1;
pi->cmapped = 1;
break;
case 15:
pi->aspect = 4.0 / 3.0;
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->cached = 1;
break;
case 16:
pi->aspect = 4.0 / 3.0;
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->i_bits = 1;
pi->cached = 1;
break;
default:
pic_error(pi, PIC_NUM_COLORS);
}
break;
case 0x1: /* PC-88VA */
if(pi->height > 1000)
pic_error(pi, PIC_SIZE);
switch(pi->width * 1000 + pi->height){
case 640400:
case 640204:
case 640200:
case 320408:
case 320400:
case 320200:
break;
default:
pic_error(pi, PIC_SIZE);
}
pi->aspect = 400.0 / pi->height;
pi->aspect *= pi->width / 640.0;
if(pi->mode & 0x1) /* HR mode */
pi->aspect *= 2.0;
if(pi->mode & 0x2){ /* tiled 256 format */
if(pi->cbits != 16)
pic_error(pi, PIC_NUM_COLORS);
pi->tiled256 = 1;
}
switch(pi->cbits){
case 8:
pi->g_bits = pi->r_bits = 3;
pi->b_bits = 2;
break;
case 12:
pi->g_bits = pi->r_bits = pi->b_bits = 4;
pi->cached = 1;
break;
case 16:
pi->g_bits = 6;
pi->r_bits = pi->b_bits = 5;
pi->cached = 1;
break;
default:
pic_error(pi, PIC_NUM_COLORS);
}
break;
case 0x2: /* FM-TOWNS */
if(pi->cbits != 15)
pic_error(pi, PIC_NUM_COLORS);
switch(pi->mode){
case 0x5:
case 0xc:
break;
default:
pic_error(pi, PIC_MODE);
}
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->cached = 1;
break;
case 0x3: /* MAC */
if(pi->cbits != 15)
pic_error(pi, PIC_NUM_COLORS);
pi->r_bits = pi->g_bits = pi->b_bits = 5;
pi->inv_gr = 1;
break;
case 0xf: /* misc */
{
byte ah, al;
switch(pi->mode){
case 0x0:
break;
case 0x1:
pi->aspect = 4.0 / 3.0;
break;
case 0xf:
break;
default:
pic_error(pi, PIC_MODE);
}
pic_read_bits(pi, 16); /* x */
pic_read_bits(pi, 16); /* y */
ah = pic_read_bits(pi, 8);
al = pic_read_bits(pi, 8);
if(ah > 0 && al > 0)
pi->aspect = (float) al / (int) ah;
else if(pi->mode == 0xf)
pic_error(pi, PIC_ASPECT);
switch(pi->cbits){
case 4:
case 8:
pi->g_bits = pi->r_bits = pi->b_bits = pic_read_bits(pi, 8);
pi->cmapped = 1;
break;
case 12:
pi->g_bits = pi->r_bits = pi->b_bits = 4;
pi->cached = 1;
break;
case 15:
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->cached = 1;
break;
case 16:
pi->g_bits = pi->r_bits = pi->b_bits = 5;
pi->i_bits = 1;
pi->cached = 1;
break;
case 24:
pi->g_bits = pi->r_bits = pi->b_bits = 8;
pi->cached = 1;
break;
case 32:
pic_error(pi, PIC_SUPPORT);
break;
default:
pic_error(pi, PIC_NUM_COLORS);
}
}
break;
default:
pic_error(pi, PIC_TYPE);
}
pi->numcols = 1 << pi->cbits;
/* read palette data */
if(pi->cmapped){
int i;
pi->cmap = pic_malloc((size_t) 3 * pi->numcols, "pic_read_header#1");
for(i = 0; i < pi->numcols; i++){
data32 c = pic_read_rgb(pi);
pi->cmap[i * 3 ] = c >> 16 & 0xff;
pi->cmap[i * 3 + 1] = c >> 8 & 0xff;
pi->cmap[i * 3 + 2] = c & 0xff;
}
}
/* setup color code cache */
if(pi->cached)
pic_cache_init(pi);
pi->data = pic_malloc(sizeof(data32) * pi->width * pi->height, // GRR POSSIBLE OVERFLOW / FIXME
"pic_read_header#2");
{
int i;
for(i = 0; i < pi->width * pi->height; i++)
pi->data[i] = 0xffffffff;
}
if(DEBUG)
pic_show_pic_info(pi);
}
/* The main routine to expand a PIC file. */
static void pic_expand_data(pi)
struct pic_info *pi;
{
int cnt;
data32 c;
pi->data[0] = c = 0;
for(cnt = -1; cnt < pi->width * pi->height; ){
int len = pic_expanding_read_len(pi);
cnt += len;
if(cnt < pi->width * pi->height){
int x = cnt % pi->width;
int y = cnt / pi->width;
data32 c = pic_expanding_read_color(pi);
pic_expanding_read_chain(pi, x, y, c);
}
}
}
static int pic_expanding_read_len(pi)
struct pic_info *pi;
{
int len;
byte bits;
for(len = 2, bits = 1; pic_read_bits(pi, 1) == 1; bits++)
len <<= 1;
return len - 1 + pic_read_bits(pi, bits);
}
static data32 pic_expanding_read_color(pi)
struct pic_info *pi;
{
if(pi->cached){
byte b = pic_read_bits(pi, 1);
if(b){
return pic_cache_get_value(pi, (int) pic_read_bits(pi, 7));
}else{
data32 c = pic_read_color_code(pi);
pic_cache_add_value(pi, c);
return c;
}
}
return pic_read_color_code(pi);
}
static void pic_expanding_read_chain(pi, x, y, c)
struct pic_info *pi;
int x, y;
data32 c;
{
pi->data[y * pi->width + x] = c;
if(pic_read_bits(pi, 1) == 1){
int fin = 0;
while(!fin){
switch(pic_read_bits(pi, 2)){
case 1: /* left */
pi->data[(++y) * pi->width + (--x)] = c;
break;
case 2: /* middle */
pi->data[(++y) * pi->width + x ] = c;
break;
case 3: /* right */
pi->data[(++y) * pi->width + (++x)] = c;
break;
case 0: /* far or nothing */
if(pic_read_bits(pi, 1) == 0)
fin = 1;
else{
if(pic_read_bits(pi, 1) == 0)
pi->data[(++y) * pi->width + (x -= 2)] = c;
else
pi->data[(++y) * pi->width + (x += 2)] = c;
}
}
}
}
}
/*
* Make a picture from the expanded data.
*/
static void pic_make_xvpic(pi, xp, rp, gp, bp)
struct pic_info *pi;
byte **xp, *rp, *gp, *bp;
{
if(pi->cmapped){
if(pi->tiled256)
*xp = pic_malloc((size_t) pi->width * pi->height * 2, // GRR POSSIBLE OVERFLOW / FIXME
"pic_make_xvpic#1");
else
*xp = pic_malloc((size_t) pi->width * pi->height, // GRR POSSIBLE OVERFLOW / FIXME
"pic_make_xvpic#2");
}else
*xp = pic_malloc((size_t) pi->width * pi->height * 3, // GRR POSSIBLE OVERFLOW / FIXME
"pic_make_xvpic#3");
if(pi->cmapped){
int i;
for(i = 0; i < pi->numcols; i++){
rp[i] = pi->cmap[i * 3 ];
gp[i] = pi->cmap[i * 3 + 1];
bp[i] = pi->cmap[i * 3 + 2];
}
if(pi->tiled256){
int pic_idx = 0, dat_idx;
data16 col = 0;
for(dat_idx = 0; dat_idx < pi->width * pi->height; dat_idx++){
if(pi->data[dat_idx] != 0xffffffff)
col = pi->data[dat_idx];
(*xp)[pic_idx++] = col & 0xff;
(*xp)[pic_idx++] = col >> 8 & 0xff;
dat_idx++;
}
}else{
int pic_idx = 0, dat_idx;
byte col = 0;
for(dat_idx = 0; dat_idx < pi->width * pi->height; dat_idx++){
if(pi->data[dat_idx] != 0xffffffff)
col = pi->data[dat_idx];
(*xp)[pic_idx++] = col;
}
}
}else{
int pic_idx = 0, dat_idx;
byte r = 0, g = 0, b = 0;
for(dat_idx = 0; dat_idx < pi->width * pi->height; dat_idx++){
if(pi->data[dat_idx] != 0xffffffff){
data32 col = pi->data[dat_idx];
r = col >> 16 & 0xff;
g = col >> 8 & 0xff;
b = col & 0xff;
}
(*xp)[pic_idx++] = r;
(*xp)[pic_idx++] = g;
(*xp)[pic_idx++] = b;
}
}
}
/* The main routine to write PIC file. */
int WritePIC(fp, pic0, ptype, w, h, rmap, gmap, bmap, numcols, colorstyle,
comment)
FILE *fp;
byte *pic0;
int ptype, w, h;
byte *rmap, *gmap, *bmap;
int numcols, colorstyle;
char *comment;
{
struct pic_info pic;
int e;
if(DEBUG) fputs("WritePIC:\n", stderr);
pic_init_info(&pic);
pic.fp = fp;
pic.width = w;
pic.height = h;
pic.writing_grey = (colorstyle == F_GREYSCALE);
if(ptype != PIC24){ /* PIC8 */
pic.cmapped = 1;
pic.cached = 0;
pic.cbits = 8;
pic.g_bits =
pic.r_bits =
pic.b_bits = 8;
pic.i_bits = 0;
pic.numcols = numcols;
}else{ /* PIC24 */
pic.cmapped = 0;
pic.cached = 1;
pic.cbits = 24;
pic.g_bits =
pic.r_bits =
pic.b_bits = 8;
pic.i_bits = 0;
pic.numcols = 1 << 24;
pic_cache_init(&pic);
}
if((e = setjmp(pic.jmp)) != 0){
/* When an error occurs while writing, comes here. */
pic_cleanup_pic_info(&pic, 1);
if(DEBUG) fputs("\n", stderr);
return -1;
}
pic_write_id(&pic);
pic_write_comment(&pic, comment);
pic_write_header(&pic);
if(pic.cmapped)
pic_write_palette(&pic, rmap, gmap, bmap);
pic_make_sparse_data(&pic, pic0);
pic_write_data(&pic);
pic_write_bits(&pic, 0, 8);
pic_cleanup_pic_info(&pic, 1);
if(DEBUG) fputs("\n", stderr);
return 0;
}
static void pic_write_id(pi)
struct pic_info *pi;
{
if(fwrite("PIC", (size_t) 3, (size_t) 1, pi->fp) != 1)
pic_file_error(pi, PIC_WRITE);
}
static void pic_write_comment(pi, comm)
struct pic_info *pi;
char *comm;
{
if(comm){
while(*comm){
int c = *comm;
if(c == '\032')
c = ' ';
if(fputc(*comm, pi->fp) == EOF)
pic_file_error(pi, PIC_WRITE);
comm++;
}
}
/* write ^Z, 0, and reserved. */
if(fwrite("\032\0\0", (size_t)3, (size_t) 1, pi->fp) != 1)
pic_file_error(pi, PIC_WRITE);
}
static void pic_write_header(pi)
struct pic_info *pi;
{
if(DEBUG) pic_show_pic_info(pi);
pic_write_bits(pi, (data32) 0, 4); /* mode: 1:1 */
pic_write_bits(pi, (data32) 0xf, 4); /* type: misc */
pic_write_bits(pi, (data32) pi->cbits, 16); /* bits */
pic_write_bits(pi, (data32) pi->width, 16); /* width */
pic_write_bits(pi, (data32) pi->height, 16); /* height */
pic_write_bits(pi, (data32) 0xffff, 16); /* x: unused */
pic_write_bits(pi, (data32) 0xffff, 16); /* y: unused */
pic_write_bits(pi, (data32) 0x0101, 16); /* real aspect */
}
static void pic_write_palette(pi, r, g, b)
struct pic_info *pi;
byte *r, *g, *b;
{
int i;
data32 rgb = 0;
pic_write_bits(pi, (data32) pi->g_bits, 8);
for(i = 0; i < pi->numcols; i++){
rgb = (data32) *r++ << 16 | (data32) *g++ << 8 | (data32) *b++;
pic_write_rgb(pi, rgb);
}
for( ; i < 256; i++)
pic_write_rgb(pi, rgb);
}
static void pic_make_sparse_data(pi, dat)
struct pic_info *pi;
byte *dat;
{
int i;
data32 c;
pi->data = pic_malloc(sizeof(data32) * pi->width * pi->height, // GRR POSSIBLE OVERFLOW / FIXME
"pic_make_sparse_data");
if(pi->cmapped){
c = 0;
for(i = 0; i < pi->width * pi->height; i++){
if(c != dat[i])
c = pi->data[i] = dat[i];
else
pi->data[i] = 0xffffffff;
}
}else{
int j = 0;
c = 0;
for(i = 0; i < pi->width * pi->height; i++){
data32 r, g, b, t;
r = dat[j++];
g = dat[j++];
b = dat[j++];
t = r << 16 | g << 8 | b;
if(c != t)
c = pi->data[i] = t;
else
pi->data[i] = 0xffffffff;
}
}
}
static void pic_write_data(pi)
struct pic_info *pi;
{
int i;
int max = pi->width * pi->height;
data32 c = 0;
i = -1;
while(i < max){
int j;
for(j = i + 1; j < max; j++){
if(pi->data[j] != 0xffffffff)
break;
}
pic_write_length(pi, (data32) j - i);
i = j;
if(i < max){
pic_write_color(pi, c = pi->data[i]);
pic_write_chain(pi, i % pi->width, i / pi->width, c);
}
}
}
static void pic_write_length(pi, len)
struct pic_info *pi;
data32 len;
{
int bits = 0; /* leading 1's */
int max = 2;
while(len > max){
max = (max + 1) * 2;
bits++;
}
pic_write_bits(pi, 0xffffffff, bits);
pic_write_bits(pi, 0, 1);
pic_write_bits(pi, len - max / 2, bits + 1);
}
static void pic_write_color(pi, c)
struct pic_info *pi;
data32 c;
{
if(pi->cached){
int idx = pic_cache_lookup(pi, c);
if(idx < 0){ /* not found */
pic_write_bits(pi, 0, 1);
pic_write_color_code(pi, c);
pic_cache_add_value(pi, c);
}else{ /* found */
pic_write_bits(pi, (data32) 0xffffffff, 1);
pic_write_bits(pi, (data32) idx, 7);
}
}else
pic_write_color_code(pi, c);
}
static void pic_write_chain(pi, x, y, c)
struct pic_info *pi;
int x, y;
data32 c;
{
int ctr = (y + 1) * pi->width + x;
if(y < pi->height - 1 &&
( pi->data[ctr ] == c ||
(x > 0 && pi->data[ctr - 1] == c) ||
(x < pi->width - 1 && pi->data[ctr + 1] == c) ||
(x > 1 && pi->data[ctr - 2] == c) ||
(x < pi->width - 2 && pi->data[ctr + 2] == c))){
pic_write_bits(pi, 1, 1);
while(++y < pi->height){
if(pi->data[ctr] == c){ /* center */
pic_write_bits(pi, 2, 2);
pi->data[ctr] = 0xffffffff;
ctr += pi->width;
}else if(x > 0 && pi->data[ctr - 1] == c){ /* left */
pic_write_bits(pi, 1, 2);
pi->data[ctr - 1] = 0xffffffff;
ctr += pi->width - 1;
}else if(x < pi->width - 1 && pi->data[ctr + 1] == c){/* right */
pic_write_bits(pi, 3, 2);
pi->data[ctr + 1] = 0xffffffff;
ctr += pi->width + 1;
}else if(x > 1 && pi->data[ctr - 2] == c){ /* 2-left */
pic_write_bits(pi, 2, 4);
pi->data[ctr - 2] = 0xffffffff;
ctr += pi->width - 2;
}else if(x < pi->width - 2 && pi->data[ctr + 2] == c){/* 2-right */
pic_write_bits(pi, 3, 4);
pi->data[ctr + 2] = 0xffffffff;
ctr += pi->width + 2;
}else /* nothing */
break;
}
pic_write_bits(pi, 0, 3);
}else
pic_write_bits(pi, 0, 1);
}
/*
* These 4 functions read or write a color.
*
* pic_read_rgb:
* reads an RGB. Each bit length is [rgb]_bits, but
* it is expanded to 8bits when returned.
*
* pic_read_color_code:
* reads a color code, whose length is cbits.
* It is the index to the colormap or RGB itself.
*
* pic_write_rgb:
* writes an RGB value.
*
* pic_write_color_code:
* writes a color code.
*/
static data32 pic_read_rgb(pi)
struct pic_info *pi;
{
int rb = pi->r_bits, gb = pi->g_bits, bb = pi->b_bits;
byte r, g, b;
if(pi->inv_gr){
r = pic_read_bits(pi, rb);
g = pic_read_bits(pi, gb);
}else{
g = pic_read_bits(pi, gb);
r = pic_read_bits(pi, rb);
}
b = pic_read_bits(pi, bb);
if(pi->i_bits){
byte i;
i = pic_read_bits(pi, pi->i_bits);
r = r << pi->i_bits | i;
g = g << pi->i_bits | i;
b = b << pi->i_bits | i;
rb += pi->i_bits;
gb += pi->i_bits;
bb += pi->i_bits;
}
r = pic_pad_bit(rb, r);
g = pic_pad_bit(gb, g);
b = pic_pad_bit(bb, b);
return (data32) r << 16 | (data32) g << 8 | (data32) b;
}
static data32 pic_read_color_code(pi)
struct pic_info *pi;
{
if(pi->cmapped)
return pic_read_bits(pi, pi->cbits);
return pic_read_rgb(pi);
}
static void pic_write_rgb(pi, rgb)
struct pic_info *pi;
data32 rgb;
{
byte r = rgb >> 16;
byte g = rgb >> 8;
byte b = rgb;
if(pi->writing_grey)
r = g = b = MONO(r, g, b);
pic_write_bits(pi, g, pi->g_bits);
pic_write_bits(pi, r, pi->r_bits);
pic_write_bits(pi, b, pi->b_bits);
}
static void pic_write_color_code(pi, code)
struct pic_info *pi;
data32 code;
{
if(pi->cmapped){
pic_write_bits(pi, code, pi->cbits);
}else{
pic_write_rgb(pi, code);
}
}
/*
* These pic_cache_* functions are an implementation of the color cache.
*
* pic_cache_init:
* initializes the cache.
*
* pic_cache_get_value:
* gets a color indexed by the argument `idx'.
* It updates the `most recently used' time.
*
* pic_cache_add_value:
* adds a color to the top of the cache list.
*/
static void pic_cache_init(pi)
struct pic_info *pi;
{
int i;
pi->cache.node = pic_malloc(sizeof(struct cachenode_t) * 128,
"pic_cache_init");
for(i = 0; i < 128; i++){
pi->cache.node[i].newer = i + 1;
pi->cache.node[i].older = i - 1;
pi->cache.node[i].dat = 0;
}
pi->cache.node[ 0].older = 127;
pi->cache.node[127].newer = 0;
pi->cache.newest = 0;
}
static data32 pic_cache_get_value(pi, idx)
struct pic_info *pi;
int idx;
{
struct cachenode_t *p = pi->cache.node;
int n = pi->cache.newest;
if(n != idx){
p[p[idx].newer].older = p[idx].older;
p[p[idx].older].newer = p[idx].newer;
p[p[n].newer].older = idx;
p[idx].newer = p[n].newer;
p[n].newer = idx;
p[idx].older = n;
pi->cache.newest = idx;
}
return pi->cache.node[idx].dat;
}
static void pic_cache_add_value(pi, dat)
struct pic_info *pi;
data32 dat;
{