ref: a1c3c34c70431447a89fbe08c3475dbfaee7b672
dir: /sys/src/cmd/jpg/ico.c/
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <draw.h>
#include <memdraw.h>
#include <event.h>
#include <cursor.h>
#include "imagefile.h"
typedef struct Icon Icon;
struct Icon
{
Icon *next;
ushort w; /* icon width */
ushort h; /* icon height */
ushort ncolor; /* number of colors */
ushort nplane; /* number of bit planes */
ushort bits; /* bits per pixel */
ulong len; /* length of data */
ulong offset; /* file offset to data */
Memimage *img;
Memimage *mask;
Rectangle r; /* relative */
Rectangle sr; /* abs */
};
typedef struct Header Header;
struct Header
{
uint n;
Icon *first;
Icon *last;
};
int debug;
int cflag;
Mouse mouse;
Header h;
Image *background;
ushort
gets(uchar *p)
{
return p[0] | (p[1]<<8);
}
ulong
getl(uchar *p)
{
return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
}
int
Bgetheader(Biobuf *b, Header *h)
{
uchar buf[40];
Icon *icon;
int i;
memset(h, 0, sizeof(*h));
if(Bread(b, buf, 6) != 6)
goto eof;
if(gets(&buf[0]) != 0)
goto header;
if(gets(&buf[2]) != 1)
goto header;
h->n = gets(&buf[4]);
for(i = 0; i < h->n; i++){
icon = mallocz(sizeof(*icon), 1);
if(icon == nil)
sysfatal("malloc: %r");
if(Bread(b, buf, 16) != 16)
goto eof;
icon->w = buf[0] == 0 ? 256 : buf[0];
icon->h = buf[1] == 0 ? 256 : buf[1];
icon->ncolor = buf[2] == 0 ? 256 : buf[2];
icon->nplane = gets(&buf[4]);
icon->bits = gets(&buf[6]);
icon->len = getl(&buf[8]);
icon->offset = getl(&buf[12]);
if(i == 0)
h->first = icon;
else
h->last->next = icon;
h->last = icon;
}
return 0;
eof:
werrstr("unexpected EOF");
return -1;
header:
werrstr("unknown header format");
return -1;
}
uchar*
transcmap(Icon *icon, int ncolor, uchar *map)
{
uchar *m, *p;
int i;
p = m = mallocz(sizeof(int)*(1<<icon->bits), 1);
if(m == nil)
sysfatal("malloc: %r");
for(i = 0; i < ncolor; i++){
*p++ = rgb2cmap(map[2], map[1], map[0]);
map += 4;
}
return m;
}
Memimage*
xor2img(Icon *icon, long chan, uchar *xor, uchar *map)
{
uchar *data;
Memimage *img;
int inxlen;
uchar *from, *to;
int s, byte, mask;
int x, y;
inxlen = 4*((icon->bits*icon->w+31)/32);
img = allocmemimage(Rect(0,0,icon->w,icon->h), chan);
if(img == nil)
return nil;
if(chan != CMAP8){
from = xor + icon->h*inxlen;
for(y = 0; y < icon->h; y++){
from -= inxlen;
loadmemimage(img, Rect(0,y,icon->w,y+1), from, inxlen);
}
return img;
}
to = data = malloc(icon->w*icon->h);
if(data == nil){
freememimage(img);
return nil;
}
/* rotate around the y axis, go to 8 bits, and convert color */
mask = (1<<icon->bits)-1;
for(y = 0; y < icon->h; y++){
s = -1;
byte = 0;
from = xor + (icon->h - 1 - y)*inxlen;
for(x = 0; x < icon->w; x++){
if(s < 0){
byte = *from++;
s = 8-icon->bits;
}
*to++ = map[(byte>>s) & mask];
s -= icon->bits;
}
}
/* stick in an image */
loadmemimage(img, Rect(0,0,icon->w,icon->h), data, icon->h*icon->w);
free(data);
return img;
}
Memimage*
and2img(Icon *icon, uchar *and)
{
uchar *data;
Memimage *img;
int inxlen;
int outxlen;
uchar *from, *to;
int x, y;
inxlen = 4*((icon->w+31)/32);
to = data = malloc(inxlen*icon->h);
if(data == nil)
return nil;
/* rotate around the y axis and invert bits */
outxlen = (icon->w+7)/8;
for(y = 0; y < icon->h; y++){
from = and + (icon->h - 1 - y)*inxlen;
for(x = 0; x < outxlen; x++)
*to++ = ~(*from++);
}
/* stick in an image */
if(img = allocmemimage(Rect(0,0,icon->w,icon->h), GREY1))
loadmemimage(img, Rect(0,0,icon->w,icon->h), data, icon->h*outxlen);
free(data);
return img;
}
int
Bgeticon(Biobuf *b, Icon *icon)
{
uchar *end;
uchar *xor;
uchar *and;
uchar *cm;
uchar *buf;
uchar *map2map;
Memimage *img;
uchar magic[4];
int ncolor;
long chan;
Bseek(b, icon->offset, 0);
if(Bread(b, magic, 4) != 4){
werrstr("unexpected EOF");
return -1;
}
if(magic[0] == 137 && memcmp(magic+1, "PNG", 3) == 0){
Rawimage **png;
Bseek(b, -4, 1);
png = Breadpng(b, CRGB);
if(png == nil || png[0] == nil)
return -1;
switch(png[0]->chandesc){
case CY:
chan = GREY8;
break;
case CYA16:
chan = CHAN2(CGrey, 8, CAlpha, 8);
break;
case CRGB24:
chan = RGB24;
break;
case CRGBA32:
chan = RGBA32;
break;
default:
werrstr("bad icon png channel descriptor");
return -1;
}
icon->mask = nil;
icon->img = allocmemimage(png[0]->r, chan);
loadmemimage(icon->img, icon->img->r, png[0]->chans[0], png[0]->chanlen);
return 0;
}
if(getl(magic) != 40){
werrstr("bad icon bmp header");
return -1;
}
if(icon->len < 40){
werrstr("bad icon bmp header length");
return -1;
}
buf = malloc(icon->len);
if(buf == nil)
return -1;
memmove(buf, magic, 4);
if(Bread(b, buf+4, icon->len-4) != icon->len-4){
werrstr("unexpected EOF");
return -1;
}
/* this header's info takes precedence over previous one */
ncolor = 0;
icon->w = getl(buf+4);
icon->h = getl(buf+8)>>1;
icon->nplane = gets(buf+12);
icon->bits = gets(buf+14);
if(icon->w == 0)
icon->w = 256;
if(icon->h == 0)
icon->h = 256;
/* limit what we handle */
switch(icon->bits){
case 1:
case 2:
case 4:
case 8:
ncolor = icon->ncolor;
if(ncolor > (1<<icon->bits))
ncolor = 1<<icon->bits;
chan = CMAP8;
break;
case 15:
case 16:
chan = RGB16;
break;
case 24:
chan = RGB24;
break;
case 32:
chan = ARGB32;
break;
default:
werrstr("don't support %d bit pixels", icon->bits);
return -1;
}
if(icon->nplane != 1){
werrstr("don't support %d planes", icon->nplane);
return -1;
}
xor = cm = buf + 40;
if(chan == CMAP8)
xor += 4*ncolor;
end = xor + icon->h*4*((icon->bits*icon->w+31)/32);
if(end < buf || end > buf+icon->len){
werrstr("bad icon length %zux != %lux", end - buf, icon->len);
return -1;
}
/* translate the color map to a plan 9 one */
map2map = nil;
if(chan == CMAP8)
map2map = transcmap(icon, ncolor, cm);
/* convert the images */
icon->img = xor2img(icon, chan, xor, map2map);
if(icon->img == nil){
werrstr("xor2img: %r");
return -1;
}
icon->mask = nil;
/* check for and mask */
and = end;
end += icon->h*4*((icon->w+31)/32);
if(end <= buf+icon->len)
icon->mask = and2img(icon, and);
/* so that we save an image with a white background */
if(img = allocmemimage(icon->img->r, icon->img->chan)){
memfillcolor(img, DWhite);
memimagedraw(img, icon->img->r, icon->img, ZP, icon->mask, ZP, SoverD);
freememimage(icon->img);
icon->img = img;
}
free(buf);
free(map2map);
return 0;
}
void
usage(void)
{
fprint(2, "usage: %s [ -c ] [ file ]\n", argv0);
exits("usage");
}
enum
{
Mimage,
Mmask,
Mexit,
Up= 1,
Down= 0,
};
char *menu3str[] = {
[Mimage] "write image",
[Mmask] "write mask",
[Mexit] "exit",
0,
};
Menu menu3 = {
menu3str
};
Cursor sight = {
{-7, -7},
{0x1F, 0xF8, 0x3F, 0xFC, 0x7F, 0xFE, 0xFB, 0xDF,
0xF3, 0xCF, 0xE3, 0xC7, 0xFF, 0xFF, 0xFF, 0xFF,
0xFF, 0xFF, 0xFF, 0xFF, 0xE3, 0xC7, 0xF3, 0xCF,
0x7B, 0xDF, 0x7F, 0xFE, 0x3F, 0xFC, 0x1F, 0xF8,},
{0x00, 0x00, 0x0F, 0xF0, 0x31, 0x8C, 0x21, 0x84,
0x41, 0x82, 0x41, 0x82, 0x41, 0x82, 0x7F, 0xFE,
0x7F, 0xFE, 0x41, 0x82, 0x41, 0x82, 0x41, 0x82,
0x21, 0x84, 0x31, 0x8C, 0x0F, 0xF0, 0x00, 0x00,}
};
void
buttons(int ud)
{
while((mouse.buttons==0) != ud)
mouse = emouse();
}
void
mesg(char *fmt, ...)
{
va_list arg;
char buf[1024];
static char obuf[1024];
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
string(screen, screen->r.min, background, ZP, font, obuf);
string(screen, screen->r.min, display->white, ZP, font, buf);
strcpy(obuf, buf);
}
void
doimage(Icon *icon)
{
int rv;
char file[256];
int fd;
rv = -1;
snprint(file, sizeof(file), "%dx%d.img", icon->w, icon->h);
fd = create(file, OWRITE, 0664);
if(fd >= 0){
rv = writememimage(fd, icon->img);
close(fd);
}
if(rv < 0)
mesg("error writing %s: %r", file);
else
mesg("created %s", file);
}
void
domask(Icon *icon)
{
int rv;
char file[64];
int fd;
if(icon->mask == nil)
return;
rv = -1;
snprint(file, sizeof(file), "%dx%d.mask", icon->w, icon->h);
fd = create(file, OWRITE, 0664);
if(fd >= 0){
rv = writememimage(fd, icon->mask);
close(fd);
}
if(rv < 0)
mesg("error writing %s: %r", file);
else
mesg("created %s", file);
}
void
apply(void (*f)(Icon*))
{
Icon *icon;
esetcursor(&sight);
buttons(Down);
if(mouse.buttons == 4)
for(icon = h.first; icon; icon = icon->next)
if(ptinrect(mouse.xy, icon->sr)){
buttons(Up);
f(icon);
break;
}
buttons(Up);
esetcursor(0);
}
void
menu(void)
{
int sel;
sel = emenuhit(3, &mouse, &menu3);
switch(sel){
case Mimage:
apply(doimage);
break;
case Mmask:
apply(domask);
break;
case Mexit:
exits(0);
break;
}
}
void
mousemoved(void)
{
Icon *icon;
for(icon = h.first; icon; icon = icon->next)
if(ptinrect(mouse.xy, icon->sr)){
mesg("%dx%d", icon->w, icon->h);
return;
}
mesg("");
}
enum
{
BORDER= 1,
};
Image*
screenimage(Memimage *m)
{
Rectangle r;
Image *i;
if(i = allocimage(display, m->r, m->chan, 0, DNofill)){
r = m->r;
while(r.min.y < m->r.max.y){
r.max.y = r.min.y+1;
loadimage(i, r, byteaddr(m, r.min), bytesperline(r, m->depth));
r.min.y++;
}
}
return i;
}
void
eresized(int new)
{
Icon *icon;
Image *i;
Rectangle r;
if(new && getwindow(display, Refnone) < 0)
sysfatal("can't reattach to window");
draw(screen, screen->clipr, background, nil, ZP);
r.max.x = screen->r.min.x;
r.min.y = screen->r.min.y + font->height + 2*BORDER;
for(icon = h.first; icon != nil; icon = icon->next){
if(icon->img == nil)
continue;
r.min.x = r.max.x + BORDER;
r.max.x = r.min.x + Dx(icon->img->r);
r.max.y = r.min.y + Dy(icon->img->r);
if(i = screenimage(icon->img)){
draw(screen, r, i, nil, ZP);
freeimage(i);
}
border(screen, r, -BORDER, display->black, ZP);
icon->sr = r;
}
flushimage(display, 1);
}
void
main(int argc, char **argv)
{
Biobuf in;
Icon *icon;
int num, fd;
Rectangle r;
Event e;
ARGBEGIN{
case 'd':
debug = 1;
break;
case 'c':
cflag = 1;
break;
default:
usage();
}ARGEND;
fd = -1;
switch(argc){
case 0:
fd = 0;
break;
case 1:
fd = open(argv[0], OREAD);
if(fd < 0)
sysfatal("opening: %r");
break;
default:
usage();
break;
}
memimageinit();
Binit(&in, fd, OREAD);
if(Bgetheader(&in, &h) < 0)
sysfatal("reading header: %r");
num = 0;
r.min = Pt(4, 4);
for(icon = h.first; icon != nil; icon = icon->next){
if(Bgeticon(&in, icon) < 0){
fprint(2, "%s: read fail: %r\n", argv0);
continue;
}
if(debug)
fprint(2, "w %ud h %ud ncolor %ud bits %ud len %lud offset %lud\n",
icon->w, icon->h, icon->ncolor, icon->bits, icon->len, icon->offset);
r.max = addpt(r.min, Pt(icon->w, icon->h));
icon->r = r;
if(cflag){
writememimage(1, icon->img);
exits(0);
}
r.min.x += r.max.x;
num++;
}
if(num == 0 || cflag)
sysfatal("no images");
initdraw(nil, nil, "ico");
background = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0x808080FF);
eresized(0);
einit(Emouse|Ekeyboard);
for(;;)
switch(event(&e)){
case Ekeyboard:
break;
case Emouse:
mouse = e.mouse;
if(mouse.buttons & 4)
menu();
else
mousemoved();
break;
}
/* not reached */
}