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xvpcd.c
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xvpcd.c
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/*
* xvpcd.c - load routine for 'PhotoCD' format pictures
*
* LoadPCD(fname, pinfo, size) - loads a PhotoCD file
*
* This routine will popup a choice of which of the 5 available resolutions
* the user wants to choose, then load it as a 24 bit image.
*
* Copyright 1993 David Clunie, Melbourne, Australia.
*
* The outline of this is shamelessly derived from xvpbm.c to read the
* file, and xvtiffwr.c to handle the popup window and X stuff (X never
* has been my forte !), and the PhotoCD format information (though not
* the code) was found in Hadmut Danisch's (danisch@ira.uka.de) hpcdtoppm
* program in which he has reverse engineered the format by studying
* hex dumps of PhotoCDs ! After all who can afford the Kodak developer's
* kit, which none of us have seen yet ? Am I even allowed to mention these
* words (Kodak, PhotoCD) ? I presume they are registered trade marks.
*
* PS. I have no idea how Halmut worked out the YCC <-> RGB conversion
* factors, but I have calculated them from his tables and the results
* look good enough to me.
*
* Added size parameter to allow the schnautzer to create thumnails
* without requesting the size every time.
*/
#include "xv.h"
#ifdef HAVE_PCD
#include <memory.h>
#ifndef alloca
# include <alloca.h> /* "not in POSIX or SUSv3" according to Linux man page */
#endif /* ...but required for Sun C compiler (alloca = macro) */
#define TRACE 0
#if TRACE
# define trace(x) fprintf x
#else
# define trace(x)
#endif
/* Comments on error-handling:
A truncated file is not considered a Major Error. The file is loaded,
and the rest of the pic is filled with 0's.
Not being able to malloc is a Fatal Error. The program is aborted. */
#ifdef __STDC__
static void magnify(int, int, int, int, int, byte *);
static int pcdError(const char *, const char *);
static int gethuffdata(byte *, byte *, byte *, int, int);
#else
static void magnify();
static int pcdError();
static int gethuffdata();
#endif
#define wcurfactor 16 /* Call WaitCursor() every n rows */
static int size; /* Set by window routines */
static int leaveitup;/* Cleared by docmd() when OK or CANCEL pressed */
static int goforit; /* Set to 1 if OK or 0 if CANCEL */
static FILE *fp;
static CBUTT lutCB;
/*
* This "beyond 100%" table is taken from ImageMagick (gamma 2.2).
* Why there are 351 entries and not 346 as per Kodak documentation
* is a mystery.
*/
static double rscale = 1.00,
gscale = 1.00,
bscale = 1.00;
static byte Y[351] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
30, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 45, 46, 47, 48, 49, 50, 51,
52, 53, 54, 56, 57, 58, 59, 60, 61, 62,
63, 64, 66, 67, 68, 69, 70, 71, 72, 73,
74, 76, 77, 78, 79, 80, 81, 82, 83, 84,
86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
107, 108, 110, 111, 112, 113, 114, 115, 116, 117,
118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
129, 130, 131, 132, 133, 134, 135, 136, 137, 138,
139, 140, 141, 142, 143, 144, 145, 146, 147, 148,
149, 150, 151, 152, 153, 154, 155, 156, 157, 158,
159, 160, 161, 162, 163, 164, 165, 166, 167, 168,
169, 170, 171, 172, 173, 174, 175, 176, 176, 177,
178, 179, 180, 181, 182, 183, 184, 185, 186, 187,
188, 189, 190, 191, 192, 193, 193, 194, 195, 196,
197, 198, 199, 200, 201, 201, 202, 203, 204, 205,
206, 207, 207, 208, 209, 210, 211, 211, 212, 213,
214, 215, 215, 216, 217, 218, 218, 219, 220, 221,
221, 222, 223, 224, 224, 225, 226, 226, 227, 228,
228, 229, 230, 230, 231, 232, 232, 233, 234, 234,
235, 236, 236, 237, 237, 238, 238, 239, 240, 240,
241, 241, 242, 242, 243, 243, 244, 244, 245, 245,
245, 246, 246, 247, 247, 247, 248, 248, 248, 249,
249, 249, 249, 250, 250, 250, 250, 251, 251, 251,
251, 251, 252, 252, 252, 252, 252, 253, 253, 253,
253, 253, 253, 253, 253, 253, 253, 253, 253, 253,
254, 254, 254, 254, 254, 254, 254, 254, 254, 254,
254, 254, 254, 254, 254, 254, 254, 254, 254, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255
};
/*******************************************/
/* The size should be -1 for the popup to ask otherwise fast is assumed */
/* returns '1' on success */
/*******************************************/
int
LoadPCD(char *fname, PICINFO *pinfo, int theSize)
{
long offset;
int mag;
int rotate;
byte header[3*0x800];
byte *pic24, *luma, *chroma1, *chroma2, *ptr, *lptr, *c1ptr, *c2ptr;
int w, h, npixels, bufsize;
int row, col;
int huffplanes;
const char *bname;
bname = BaseName(fname);
pinfo->pic = NULL;
pinfo->comment = NULL;
/*
* open the file
*/
if((fp=fopen(fname,"r")) == NULL)
return pcdError(bname, "can't open file");
/*
* inspect the header
*/
if(fread(&header[0], 1, sizeof(header), fp) != sizeof(header))
return pcdError(bname, "could not load PCD header");
if(strncmp((char *)&header[0x800], "PCD_", 4) != 0)
return pcdError(bname, "not a PCD file");
rotate = header[0x0E02] & 0x03;
/* base/16
- plain data starts at sector 1+2+1=4
(numbered from 0, ie. the 5th sector)
- luma 192*128 = 24576 bytes (12 sectors)
+ chroma1 96*64 = 6144 bytes (3 sectors)
+ chroma2 96*64 = 6144 bytes (3 sectors)
= total 18 sectors
- NB. "Plain" data is interleaved - 2 luma rows 192 wide,
then 1 of each of the chroma rows 96 wide !
base/4
- plain data starts at sector 1+2+1+18+1=23
- luma 384*256 = 98304 bytes (48 sectors)
+ chroma1 192*128 = 24576 bytes (12 sectors)
+ chroma2 192*128 = 24576 bytes (12 sectors)
= total 72 sectors
- NB. "Plain" data is interleaved - 2 luma rows 384 wide,
then 1 of each of the chroma rows 192 wide !
base
- plain data starts at sector 1+2+1+18+1+72+1=96
- luma 768*512 = 393216 bytes (192 sectors)
+ chroma1 384*256 = 98304 bytes (48 sectors)
+ chroma2 384*256 = 98304 bytes (48 sectors)
= total 288 sectors
- NB. "Plain" data is interleaved - 2 luma rows 768 wide,
then 1 of each of the chroma rows 384 wide !
4base
- plain data for base is read
- luma data interpolated *2
- chroma data interpolated *4
- cd_offset is 1+2+1+18+1+72+1+288=384
- at cd_offset+4 (388) is huffman table
- at cd_offset+5 (389) is 4base luma plane
(the sector at cd_offset+3 seems to contain 256 words each of
which is an offset presumably to the sector containing certain
rows ? rows/4 given 1024 possible rows. The rest of this sector
is filled with zeroes)
16base
- plain data for base is read
- luma data interpolated *2
- chroma data interpolated *4
- cd_offset is 1+2+1+18+1+72+1+288=384
- at cd_offset+4 (388) is huffman table for 4 base
- at cd_offset+5 (389) is 4base luma plane
- luma plane interpolated *2
- cd_offset is set to current position (should be start of sector)
- at cd_offset+12 is huffman table for 16 base
- at cd_offset+14 is 16 base luma & 2 chroma planes which are read
(note that the luma plane comes first, with a sync pattern
announcing each row from 0 to 2047, then the two chroma planes
are interleaved by row, the row # being even from 0 to 2046, with
each row containing 1536 values, the chroma1 row coming first,
finally followed by a sync pattern with a row of 2048 announcing
the end (its plane seems to be set to 3, ie. chroma2)
- chroma planes interpolated *2
(the sector at cd_offset+10 & 11 seem to contain 1024 pairs of words
the first for luma and the second for chroma, each of
which is an offset presumably to the sector containing certain
rows ? rows/2 given 2048 possible rows)
Not yet implemented:
In order to do overskip for base and 4base, one has to reach the chroma
data for 16 base:
- for 4base, after reading the 4base luma plane (and presumably
skipping the chroma planes) one sets cd_offset to the start of
the "current" sector
- for base, one has to skip the 4base data first:
- cd_offset is set to 384
- at (cd_offset+3 sectors)[510] is a 16 bit word high byte 1st
containing an offset to the beginning of the 16base stuff
though there is then a loop until >30 0xff's start a sector !
- being now positioned after the end of the 4base stuff,
- at (cd_offset+10 sectors)[2] is a 16 bit word high byte 1st
containing an offset to the chroma planes.
- at cd_offset+12 is the set of huffman tables
- for base, the 16base chroma planes are then halved
*/
PCDSetParamOptions(bname);
if (theSize == -1)
{
PCDDialog(1); /* Open PCD Dialog box */
SetCursors(-1); /* Somebody has already set it to wait :( */
leaveitup=1;
goforit=0;
size = 1;
/* block until the popup window gets closed */
while (leaveitup) {
int i;
XEvent event;
XNextEvent(theDisp, &event);
HandleEvent(&event, &i);
}
/* At this point goforit and size will have been set */
if (!goforit) {
/* nothing allocated so nothing needs freeing */
return 0;
}
WaitCursor();
}
else
{
size = theSize;
goforit = 1;
}
if(lutCB.val)
rscale = gscale = bscale = 255.0/346.0;
else
rscale = gscale = bscale = 1.0;
switch (size) {
case 0:
pinfo->w = 192;
pinfo->h = 128;
offset=4*0x800;
mag=1;
huffplanes=0;
sprintf(pinfo->fullInfo, "PhotoCD, base/16 resolution");
break;
case 1:
pinfo->w = 384;
pinfo->h = 256;
offset=23*0x800;
mag=1;
huffplanes=0;
sprintf(pinfo->fullInfo, "PhotoCD, base/4 resolution");
break;
case 2:
default:
pinfo->w = 768;
pinfo->h = 512;
offset=96*0x800;
mag=1;
huffplanes=0;
sprintf(pinfo->fullInfo, "PhotoCD, base resolution");
break;
case 3:
pinfo->w = 1536;
pinfo->h = 1024;
offset=96*0x800;
mag=2;
huffplanes=1;
sprintf(pinfo->fullInfo, "PhotoCD, 4base resolution");
break;
case 4:
pinfo->w=3072;
pinfo->h=2048;
offset=96*0x800;
mag=4;
huffplanes=2;
sprintf(pinfo->fullInfo, "PhotoCD, 16base resolution");
break;
}
/*
* rotate?
*/
w = pinfo->w;
h = pinfo->h;
switch(rotate) {
case 0:
break;
case 1:
case 3:
pinfo->w = h;
pinfo->h = w;
break;
default:
fprintf(stderr, "unknown image rotate %d; assuming none\n",
rotate);
rotate = 0;
}
/*
* allocate 24-bit image
*/
npixels = pinfo->w * pinfo->h;
bufsize = 3 * npixels;
if (pinfo->w <= 0 || pinfo->h <= 0 || npixels/pinfo->w != pinfo->h ||
bufsize/3 != npixels)
FatalError("image dimensions out of range");
pinfo->pic = (byte *)malloc((size_t) bufsize);
if(!pinfo->pic)
FatalError("couldn't malloc '24-bit RGB plane'");
pinfo->type = PIC24;
sprintf(pinfo->shrtInfo, "%dx%d PhotoCD.", pinfo->w, pinfo->h);
pinfo->colType = F_FULLCOLOR;
pinfo->frmType = -1;
if(fseek(fp, offset, SEEK_SET) == -1) {
free(pinfo->pic);
return pcdError(bname,"Can't find start of data.");
}
pic24 = pinfo->pic;
luma=(byte *)calloc(npixels,1);
if(!luma) {
free(pinfo->pic);
FatalError("couldn't malloc 'luma plane'");
}
chroma1=(byte *)calloc(npixels/4,1);
if(!chroma1) {
free(pinfo->pic);
free(luma);
FatalError("couldn't malloc 'chroma1 plane'");
}
chroma2=(byte *)calloc(npixels/4,1);
if(!chroma2) {
free(pinfo->pic);
free(luma);
free(chroma1);
FatalError("couldn't malloc 'chroma2 plane'");
}
/* Read 2 luma rows length w, then one of each chroma rows w/2 */
/* If a mag factor is active, the small image is read into the */
/* top right hand corner of the larger allocated image */
trace((stderr, "base image: start @ 0x%08lx (sector %ld.%ld)\n",
ftell(fp), ftell(fp)/0x800, ftell(fp) % 0x800));
for(row=0,lptr=luma,c1ptr=chroma1,c2ptr=chroma2; row <h/mag;
row+=2,lptr+=w*2,c1ptr+=w/2,c2ptr+=w/2) {
if(fread(lptr, 1, w/mag, fp) != w/mag) {
pcdError(bname, "Luma plane too short.");
break;
}
if(fread(lptr+w, 1, w/mag, fp) != w/mag) {
pcdError(bname, "Luma plane too short.");
break;
}
if(fread(c1ptr, 1, w/2/mag, fp) != w/2/mag) {
pcdError(bname, "Chroma1 plane too short.");
break;
}
if(fread(c2ptr, 1, w/2/mag, fp) != w/2/mag) {
pcdError(bname, "Chroma2 plane too short.");
break;
}
if(row%wcurfactor == 0)
WaitCursor();
}
trace((stderr, "base image: done @ 0x%08lx (sector %ld.%ld)\n",
ftell(fp), ftell(fp)/0x800, ftell(fp) % 0x800));
if(huffplanes) {
if(fseek(fp, 388*0x800, SEEK_SET) == -1)
return pcdError(bname,
"Can't find start of huffman tables.");
magnify(2, h/mag, w/mag, h, w, luma);
magnify(2, h/2/mag, w/2/mag, h/2, w/2, chroma1);
magnify(2, h/2/mag, w/2/mag, h/2, w/2, chroma2);
/*
* doesn't really touch the chroma planes which aren't
* present in 4base
*/
gethuffdata(luma, chroma1, chroma2, w, h/mag*2);
/*
* if only doing 4base should probably fetch 16bases
* chroma planes here
*/
if(huffplanes == 2) {
/*
* This depends on gethuffdata() having grabbed
* things in 0x800 sectors AND still being
* positioned in the "last" sector of the data
* (cf. Hadmut's code which is positioned at start
* of the next sector)
*/
long offset = ftell(fp)/0x800+12;
if(fseek(fp, offset*0x800, SEEK_SET) == 0) {
magnify(2,h/2,w/2,h,w,luma);
magnify(2,h/4,w/4,h/2,w/2,chroma1);
magnify(2,h/4,w/4,h/2,w/2,chroma2);
gethuffdata(luma,chroma1,chroma2,w,h);
} else
fprintf(stderr, "can't seek to 2nd huffman tables\n");
}
}
fclose(fp);
/*
* YCC -> R'G'B' and image rotate
*/
ptr=pic24;
lptr=luma; c1ptr=chroma1; c2ptr=chroma2;
for(row = 0; row < h; ++row) {
byte *rowc1ptr = c1ptr,
*rowc2ptr = c2ptr;
int k = 0;
switch(rotate) {
case 1:
ptr = &pic24[row*3 + (w - 1)*h*3];
k = -3*(h + 1);
break;
case 3:
ptr = &pic24[(h - 1 - row)*3];
k = 3*(h - 1);
break;
default:
ptr = &pic24[row*w*3];
k = 0;
break;
}
for(col = 0; col < w; ++col) {
double L = 1.3584*(double) *lptr++,
C1 = 2.2179*(double) (*c1ptr - 156),
C2 = 1.8215*(double) (*c2ptr - 137);
int r = rscale*(L + C2),
g = gscale*(L - 0.194*C1 - 0.509*C2),
b = bscale*(L + C1);
if(lutCB.val) {
if(r < 0) r = 0; else if(r >= 255) r = 255;
if(g < 0) g = 0; else if(g >= 255) g = 255;
if(b < 0) b = 0; else if(b >= 255) b = 255;
} else {
if(r < 0) r = 0; else if(r >= 351) r = 350;
if(g < 0) g = 0; else if(g >= 351) g = 350;
if(b < 0) b = 0; else if(b >= 351) b = 350;
r = Y[r]; g = Y[g]; b = Y[b];
}
*ptr++ = r;
*ptr++ = g;
*ptr++ = b;
ptr += k;
if(col & 1) {
++c1ptr;
++c2ptr;
}
}
if((row & 1) == 0) {
c1ptr = rowc1ptr;
c2ptr = rowc2ptr;
}
if(row%wcurfactor == 0)
WaitCursor();
}
free(luma); free(chroma1); free(chroma2);
return 1;
}
/*
* derived from Hadmut Danisch's interpolate()
*/
static void
magnify(int mag, /* power of 2 by which to magnify in place */
int h, int w, /* the "start" unmag'd dimensions of the array */
int mh, int mw, /* the real (maximum) dimensions of the array */
byte *p) /* pointer to the data */
{
int x,y,yi;
byte *optr,*nptr,*uptr; /* MUST be unsigned, else averaging fails */
while (mag > 1) {
/* create every 2nd new row from 0 */
/* even pixels being equal to the old, odd ones averaged with successor */
/* special case being the last column which is just set equal to the */
/* second last) ... */
for(y=0;y<h;y++) {
yi=h-1-y;
optr=p+ yi*mw + (w-1); /* last pixel of an old row */
nptr=p+2*yi*mw + (2*w - 2); /* last pixel of a new row */
nptr[0]=nptr[1]=optr[0]; /* special cases */
for(x=1;x<w;x++) {
optr--; nptr-=2; /* next lower pixel(s) */
nptr[0]=optr[0]; /* even pixels duped */
nptr[1]=(((int)optr[0])+
((int)optr[1])+1)>>1; /* odd averaged */
}
}
/* Fill in odd rows, as average of prior & succeeding rows, with */
/* even pixels average of one column, odd pixels average of two */
for(y=0;y<h-1;y++) { /* all but the last old row */
optr=p + 2*y*mw; /* start of the new "even" rows */
nptr=optr+mw; /* start of the next empty row */
uptr=nptr+mw; /* start of the next again (even) */
for(x=0;x<w-1;x++) { /* for all cols except the last */
nptr[0]=(((int)optr[0])+
((int)uptr[0])+1)>>1; /* even pixels */
nptr[1]=(((int)optr[0])+
((int)optr[2])+
((int)uptr[0])+
((int)uptr[2])+2)>>2; /* odd pixels */
nptr+=2; optr+=2; uptr+=2;
}
*(nptr++)=(((int)*(optr++))+
((int)*(uptr++))+1)>>1; /* 2nd last pixel */
*(nptr++)=(((int)*(optr++))+
((int)*(uptr++))+1)>>1; /* last pixel */
}
xvbcopy((char *)(p + (2*h-2)*mw), /* 2nd last row */
(char *)(p + (2*h-1)*mw), /* the last row */
2*w); /* length of a new row */
h*=2; w*=2;
mag>>=1; /* Obviously mag must be a power of 2 ! */
}
}
/*******************************************/
static int
pcdError(const char *fname, const char *st)
{
SetISTR(ISTR_WARNING,"%s: %s", fname, st);
return 0;
}
/**** Stuff for PCDDialog box ****/
#define TWIDE 380
#define THIGH 160
#define T_NBUTTS 2
#define T_BOK 0
#define T_BCANC 1
#define BUTTH 24
static void drawTD PARM((int, int, int, int));
static void clickTD PARM((int, int));
static void doCmd PARM((int));
static void PCDSetParams PARM((void));
/* local variables */
static BUTT tbut[T_NBUTTS];
static RBUTT *resnRB;
/***************************************************/
void CreatePCDW()
{
int y;
pcdW = CreateWindow("xv pcd", "XVpcd", NULL,
TWIDE, THIGH, infofg, infobg, 0);
if (!pcdW) FatalError("can't create pcd window!");
XSelectInput(theDisp, pcdW, ExposureMask | ButtonPressMask | KeyPressMask);
BTCreate(&tbut[T_BOK], pcdW, TWIDE-140-1, THIGH-10-BUTTH-1, 60, BUTTH,
"Ok", infofg, infobg, hicol, locol);
BTCreate(&tbut[T_BCANC], pcdW, TWIDE-70-1, THIGH-10-BUTTH-1, 60, BUTTH,
"Cancel", infofg, infobg, hicol, locol);
y = 55;
resnRB = RBCreate(NULL, pcdW, 36, y, "192*128 Base/16",
infofg, infobg,hicol,locol);
RBCreate(resnRB, pcdW, 36, y+18, "384*256 Base/4",
infofg, infobg,hicol,locol);
RBCreate(resnRB, pcdW, 36, y+36, "768*512 Base",
infofg, infobg, hicol, locol);
RBCreate(resnRB, pcdW, TWIDE/2, y, "1536*1024 4Base",
infofg, infobg, hicol, locol);
RBCreate(resnRB, pcdW, TWIDE/2, y+18, "3072*2048 16Base",
infofg, infobg, hicol, locol);
CBCreate(&lutCB, pcdW, TWIDE/2, y+36, "Linear LUT",
infofg, infobg, hicol, locol);
RBSelect(resnRB, 2);
XMapSubwindows(theDisp, pcdW);
}
/***************************************************/
void PCDDialog(vis)
int vis;
{
if (vis) {
CenterMapWindow(pcdW, tbut[T_BOK].x + tbut[T_BOK].w/2,
tbut[T_BOK].y + tbut[T_BOK].h/2, TWIDE, THIGH);
}
else XUnmapWindow(theDisp, pcdW);
pcdUp = vis;
}
/***************************************************/
int PCDCheckEvent(xev)
XEvent *xev;
{
/* check event to see if it's for one of our subwindows. If it is,
deal accordingly, and return '1'. Otherwise, return '0' */
int rv;
rv = 1;
if (!pcdUp) return 0;
if (xev->type == Expose) {
int x,y,w,h;
XExposeEvent *e = (XExposeEvent *) xev;
x = e->x; y = e->y; w = e->width; h = e->height;
if (e->window == pcdW) drawTD(x, y, w, h);
else rv = 0;
}
else if (xev->type == ButtonPress) {
XButtonEvent *e = (XButtonEvent *) xev;
int x,y;
x = e->x; y = e->y;
if (e->button == Button1) {
if (e->window == pcdW) clickTD(x,y);
else rv = 0;
} /* button1 */
else rv = 0;
} /* button press */
else if (xev->type == KeyPress) {
XKeyEvent *e = (XKeyEvent *) xev;
char buf[128]; KeySym ks; XComposeStatus status;
int stlen;
stlen = XLookupString(e,buf,128,&ks,&status);
buf[stlen] = '\0';
RemapKeyCheck(ks, buf, &stlen);
if (e->window == pcdW) {
if (stlen) {
if (buf[0] == '\r' || buf[0] == '\n') { /* enter */
FakeButtonPress(&tbut[T_BOK]);
}
else if (buf[0] == '\033') { /* ESC */
FakeButtonPress(&tbut[T_BCANC]);
}
}
}
else rv = 0;
}
else rv = 0;
if (rv==0 && (xev->type == ButtonPress || xev->type == KeyPress)) {
XBell(theDisp, 50);
rv = 1; /* eat it */
}
return rv;
}
/***************************************************/
void
PCDSetParamOptions(const char *fname)
{
int cur;
cur = RBWhich(resnRB);
RBSetActive(resnRB,0,1);
RBSetActive(resnRB,1,1);
RBSetActive(resnRB,2,1);
RBSetActive(resnRB,3,1);
RBSetActive(resnRB,4,1);
CBSetActive(&lutCB,1);
}
/***************************************************/
static void
drawTD(int x, int y, int w, int h)
{
const char *title = "Load PhotoCD file...";
int i;
XRectangle xr;
xr.x = x; xr.y = y; xr.width = w; xr.height = h;
XSetClipRectangles(theDisp, theGC, 0,0, &xr, 1, Unsorted);
XSetForeground(theDisp, theGC, infofg);
XSetBackground(theDisp, theGC, infobg);
for (i=0; i<T_NBUTTS; i++) BTRedraw(&tbut[i]);
ULineString(pcdW, resnRB->x-16, resnRB->y-10-DESCENT, "Resolution");
RBRedraw(resnRB, -1);
CBRedraw(&lutCB);
XDrawString(theDisp, pcdW, theGC, 20, 19, title, strlen(title));
XSetClipMask(theDisp, theGC, None);
}
/***************************************************/
static void clickTD(x,y)
int x,y;
{
int i;
BUTT *bp;
/* check BUTTs */
/* check the RBUTTS first, since they don't DO anything */
if ( (i=RBClick(resnRB, x,y)) >= 0) {
(void) RBTrack(resnRB, i);
return;
}
if(CBClick(&lutCB, x, y)) {
(void) CBTrack(&lutCB);
return;
}
for (i=0; i<T_NBUTTS; i++) {
bp = &tbut[i];
if (PTINRECT(x, y, bp->x, bp->y, bp->w, bp->h)) break;
}
if (i<T_NBUTTS) { /* found one */
if (BTTrack(bp)) doCmd(i);
}
}
/***************************************************/
static void doCmd(cmd)
int cmd;
{
leaveitup=0;
goforit=0;
switch (cmd) {
case T_BOK: PCDSetParams();
goforit=1;
case T_BCANC: PCDDialog(0);
break;
default: break;
}
}
/*******************************************/
static void PCDSetParams()
{
switch (RBWhich(resnRB)) {
case 0: size = 0; break;
case 1: size = 1; break;
case 2: size = 2; break;
case 3: size = 3; break;
case 4: size = 4; break;
case 5: size = 0; break;
default: size = 0; break;
}
}
/*
* Read the Huffman tables which consist of an unsigned byte # of entries
* (less 1) followed by up to 256 entries, each of which is a series of 4
* unsigned bytes - length, highseq, lowseq, and key.
*
* Store the huffman table into tree type structure:
*
* int int[n of entries*2]
*
* Each entry consists of two words (the 1st for zero and the 2nd for one).
*
* If the word is negative, then subtract it from the current pointer to
* get the next entry (ie. it is the negative offset from the current
* position*2 in order to skip entries not words) with which to
* make a decision.
*
* If the word is not negative, then the low 8 bits contain the value (which
* is supposed to be a signed char) and the rest of the word is zero.
*/
static void
dumphufftab(int n, const byte *h, int m, const int *t)
{
int j;
for(j = 0; j < n || j < m; ++j) {
if(j < m)
fprintf(stderr, "%04x %04x ::", 0xffff & t[2*j + 0],
0xffff & t[2*j + 1]);
else
fprintf(stderr, "%s %s ::", " ", " ");
if(j < n) {
int k;
unsigned l = (h[4*j + 1] << 8) | h[4*j + 2];
fprintf(stderr, " %02x %2d ", h[4*j + 3], h[4*j + 0]);
for(k = 0; k <= h[4*j + 0]; ++k, l *= 2)
fprintf(stderr, "%c", '0'+((l & 0x8000) != 0));
}
fprintf(stderr, "\n");
}
}
static int *
gethufftable(void)
{
int *hufftab, *h, i, j, N, num, bufsize, huffptr, hufftop;
byte *huf;
/*
* absorb the entirety of the table in one chunk (for better
* dumps in case of error)
*/
trace((stderr, "hufftab 0x%08lx ", ftell(fp)));
num = 1 + fgetc(fp); /* 256 max */
huf = (byte *)alloca(4*num*sizeof(byte));
if((i = fread(huf, 1, 4*num, fp)) != 4*num) {
fprintf(stderr, "unexpected EOF: got %d bytes, wanted %d\n",
i, 4*num);
return NULL;
}
/*
* guess an initial size and prepare the initial entry
*/
trace((stderr, "length %u\n", num));
N = 2*num; /* 512 max */
bufsize = N * sizeof(int);
/* this case can't happen, but added for symmetry with loop below
if (N/2 != num || bufsize/N != sizeof(int)) {
SetISTR(ISTR_WARNING, "Huffman table size out of range");
return NULL;
}
*/
if((hufftab = (int *)malloc(bufsize)) == NULL)
FatalError("couldn't malloc initial Huffman table");
hufftab[0] = hufftab[1] = 0;
/*
* we check the table for reasonableness; there is a lack of detailed
* documentation on this format. in particular, for the base16,
* the position of the huffman tables is uncertain to within one
* "sector", and we have to detect his before trying to read
* bogusness.
*/
hufftop = 0;
for(i = 0; i < num; ++i) {
unsigned length = huf[4*i + 0],
codeword = (huf[4*i + 1] << 8) | huf[4*i + 2];
/*
* some sanity checks
*/
if(length >= 16) {
fprintf(stderr,
"gethufftable: improbable length @ %d/%d\n",
i, num);
dumphufftab(num, huf, hufftop/2, hufftab);
free(hufftab);
return NULL;
}
/*
* walk the whole set of codes
*/
huffptr = 0;
for(j = 0; j < 16; ++j, codeword *= 2) {
/*
* choose the child node
*/
if(codeword & 0x8000)
++huffptr;
/*
* store value at end-of-code
*/
if(j == length) {
/*
* more sanity
*/
if((codeword *= 2) & 0xffff) {
fprintf(stderr,
"gethufftable: "
":probable invalid code @ %d\n",
i);
dumphufftab(num, huf,
hufftop/2, hufftab);
free(hufftab);
return NULL;
}
hufftab[huffptr] = 1 + (int) huf[4*i + 3];
break;
}
/*
* otherwise, follow the tree to date
*/
if(hufftab[huffptr] < 0) {
huffptr -= hufftab[huffptr];
continue;
} else if(hufftab[huffptr] > 0) {
fprintf(stderr, "duplicate code %d %d/%d\n",
huffptr, i, num);
dumphufftab(num, huf, hufftop/2, hufftab);
free(hufftab);
return NULL;
}
/*
* and if necessary, make the tree bigger
*/
if((hufftop += 2) >= N) {