| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: normcodec.c,v 2.2 2019/07/26 17:04:12 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines to encode/decode 32-bit normals |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "copyright.h" |
| 9 |
|
| 10 |
#include "rtio.h" |
| 11 |
#include "rtmath.h" |
| 12 |
#include "normcodec.h" |
| 13 |
|
| 14 |
|
| 15 |
/* Set codec defaults */ |
| 16 |
void |
| 17 |
set_nc_defaults(NORMCODEC *ncp) |
| 18 |
{ |
| 19 |
memset(ncp, 0, sizeof(NORMCODEC)); |
| 20 |
ncp->finp = stdin; |
| 21 |
ncp->inpname = "<stdin>"; |
| 22 |
ncp->format = 'a'; |
| 23 |
ncp->swapped = 0; |
| 24 |
ncp->res.rt = PIXSTANDARD; |
| 25 |
if (!progname) progname = "norm_codec"; |
| 26 |
} |
| 27 |
|
| 28 |
|
| 29 |
/* process header line */ |
| 30 |
static int |
| 31 |
headline(char *s, void *p) |
| 32 |
{ |
| 33 |
NORMCODEC *ncp = (NORMCODEC *)p; |
| 34 |
int rv; |
| 35 |
|
| 36 |
if (formatval(ncp->inpfmt, s)) /* don't pass format */ |
| 37 |
return 0; |
| 38 |
|
| 39 |
if ((rv = isbigendian(s)) >= 0) { |
| 40 |
ncp->swapped = (nativebigendian() != rv); |
| 41 |
return 0; |
| 42 |
} |
| 43 |
if (ncp->hdrflags & HF_HEADOUT) |
| 44 |
fputs(s, stdout); /* copy to standard output */ |
| 45 |
return 1; |
| 46 |
} |
| 47 |
|
| 48 |
|
| 49 |
/* Load/copy header */ |
| 50 |
int |
| 51 |
process_nc_header(NORMCODEC *ncp, int ac, char *av[]) |
| 52 |
{ |
| 53 |
if (ncp->hdrflags & HF_HEADIN && |
| 54 |
getheader(ncp->finp, headline, ncp) < 0) { |
| 55 |
if (ncp->hdrflags & HF_STDERR) { |
| 56 |
fputs(ncp->inpname, stderr); |
| 57 |
fputs(": bad header\n", stderr); |
| 58 |
} |
| 59 |
return 0; |
| 60 |
} |
| 61 |
if (ncp->hdrflags & HF_HEADOUT) { /* finish header */ |
| 62 |
if (!(ncp->hdrflags & HF_HEADIN)) |
| 63 |
newheader("RADIANCE", stdout); |
| 64 |
if (ac > 0) |
| 65 |
printargs(ac, av, stdout); |
| 66 |
if (ncp->hdrflags & HF_ENCODE) { |
| 67 |
fputformat(NORMAL32FMT, stdout); |
| 68 |
} else |
| 69 |
switch (ncp->format) { |
| 70 |
case 'a': |
| 71 |
fputformat("ascii", stdout); |
| 72 |
break; |
| 73 |
case 'f': |
| 74 |
fputendian(stdout); |
| 75 |
fputformat("float", stdout); |
| 76 |
break; |
| 77 |
case 'd': |
| 78 |
fputendian(stdout); |
| 79 |
fputformat("double", stdout); |
| 80 |
break; |
| 81 |
} |
| 82 |
fputc('\n', stdout); |
| 83 |
} |
| 84 |
/* get/put resolution string */ |
| 85 |
if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) { |
| 86 |
if (ncp->hdrflags & HF_STDERR) { |
| 87 |
fputs(ncp->inpname, stderr); |
| 88 |
fputs(": bad resolution string\n", stderr); |
| 89 |
} |
| 90 |
return 0; |
| 91 |
} |
| 92 |
if (ncp->hdrflags & HF_RESOUT) |
| 93 |
fputsresolu(&ncp->res, stdout); |
| 94 |
|
| 95 |
ncp->dstart = ncp->curpos = ftell(ncp->finp); |
| 96 |
return 1; |
| 97 |
} |
| 98 |
|
| 99 |
|
| 100 |
/* Check that we have what we need to decode normals */ |
| 101 |
int |
| 102 |
check_decode_normals(NORMCODEC *ncp) |
| 103 |
{ |
| 104 |
if (ncp->hdrflags & HF_ENCODE) { |
| 105 |
if (ncp->hdrflags & HF_STDERR) { |
| 106 |
fputs(progname, stderr); |
| 107 |
fputs(": wrong header mode for decode\n", stderr); |
| 108 |
} |
| 109 |
return 0; |
| 110 |
} |
| 111 |
if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) { |
| 112 |
if (ncp->hdrflags & HF_STDERR) { |
| 113 |
fputs(ncp->inpname, stderr); |
| 114 |
fputs(": unexpected input format: ", stderr); |
| 115 |
fputs(ncp->inpfmt, stderr); |
| 116 |
fputc('\n', stderr); |
| 117 |
} |
| 118 |
return 0; |
| 119 |
} |
| 120 |
return 1; |
| 121 |
} |
| 122 |
|
| 123 |
|
| 124 |
/* Decode next normal from input */ |
| 125 |
int |
| 126 |
decode_normal_next(FVECT nrm, NORMCODEC *ncp) |
| 127 |
{ |
| 128 |
int32 c = getint(4, ncp->finp); |
| 129 |
|
| 130 |
if (c == EOF && feof(ncp->finp)) |
| 131 |
return -1; |
| 132 |
|
| 133 |
ncp->curpos += 4; |
| 134 |
|
| 135 |
decodedir(nrm, c); |
| 136 |
|
| 137 |
return (c != 0); |
| 138 |
} |
| 139 |
|
| 140 |
|
| 141 |
/* Seek to the indicated pixel position */ |
| 142 |
int |
| 143 |
seek_nc_pix(NORMCODEC *ncp, int x, int y) |
| 144 |
{ |
| 145 |
long seekpos; |
| 146 |
|
| 147 |
if ((ncp->res.xr <= 0) | (ncp->res.yr <= 0)) { |
| 148 |
if (ncp->hdrflags & HF_STDERR) { |
| 149 |
fputs(progname, stderr); |
| 150 |
fputs(": need map resolution to seek\n", stderr); |
| 151 |
} |
| 152 |
return -1; |
| 153 |
} |
| 154 |
if ((x < 0) | (y < 0) || |
| 155 |
(x >= scanlen(&ncp->res)) | (y >= numscans(&ncp->res))) { |
| 156 |
if (ncp->hdrflags & HF_STDERR) { |
| 157 |
fputs(ncp->inpname, stderr); |
| 158 |
fputs(": warning - pixel index off map\n", stderr); |
| 159 |
} |
| 160 |
return 0; |
| 161 |
} |
| 162 |
seekpos = ncp->dstart + 4*((long)y*scanlen(&ncp->res) + x); |
| 163 |
|
| 164 |
if (seekpos != ncp->curpos && |
| 165 |
fseek(ncp->finp, seekpos, SEEK_SET) == EOF) { |
| 166 |
if (ncp->hdrflags & HF_STDERR) { |
| 167 |
fputs(ncp->inpname, stderr); |
| 168 |
fputs(": seek error\n", stderr); |
| 169 |
} |
| 170 |
return -1; |
| 171 |
} |
| 172 |
ncp->curpos = seekpos; |
| 173 |
return 1; |
| 174 |
} |
| 175 |
|
| 176 |
|
| 177 |
/* Read and decode normal for the given pixel */ |
| 178 |
int |
| 179 |
decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y) |
| 180 |
{ |
| 181 |
int rval = seek_nc_pix(ncp, x, y); |
| 182 |
|
| 183 |
if (rval < 0) |
| 184 |
return -1; |
| 185 |
|
| 186 |
if (!rval) { |
| 187 |
nrm[0] = nrm[1] = nrm[2] = .0; |
| 188 |
return 0; |
| 189 |
} |
| 190 |
return decode_normal_next(nrm, ncp); |
| 191 |
} |
