1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.8 |
static const char RCSid[] = "$Id: depthcodec.c,v 2.7 2020/01/25 02:36:25 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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/* |
5 |
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* Routines to encode/decoded 16-bit depths |
6 |
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*/ |
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#include "copyright.h" |
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#include <stdlib.h> |
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#include <math.h> |
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#include <ctype.h> |
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#include "rtio.h" |
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#include "fvect.h" |
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#include "depthcodec.h" |
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18 |
greg |
2.3 |
#ifndef depth2code |
19 |
greg |
2.1 |
/* Encode depth as 16-bit signed integer */ |
20 |
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int |
21 |
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depth2code(double d, double dref) |
22 |
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{ |
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if (d <= .0) |
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return -32768; |
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26 |
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if (d > dref) |
27 |
greg |
2.3 |
return (int)(32768.001 - 32768.*dref/d) - 1; |
28 |
greg |
2.1 |
|
29 |
greg |
2.8 |
return (int)(32767.*d/dref - 32768.999); |
30 |
greg |
2.1 |
} |
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#endif |
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34 |
greg |
2.3 |
#ifndef code2depth |
35 |
greg |
2.1 |
/* Decode depth from 16-bit signed integer */ |
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double |
37 |
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code2depth(int c, double dref) |
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{ |
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if (c <= -32768) |
40 |
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return .0; |
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42 |
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if (c >= 32767) |
43 |
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return FHUGE; |
44 |
greg |
2.5 |
|
45 |
greg |
2.7 |
if (c >= -1) |
46 |
greg |
2.5 |
return dref*32768./(32766.5 - c); |
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48 |
greg |
2.7 |
return dref*(32768.5 + c)*(1./32767.); |
49 |
greg |
2.1 |
} |
50 |
greg |
2.3 |
#endif |
51 |
greg |
2.1 |
|
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/* Set codec defaults */ |
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void |
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set_dc_defaults(DEPTHCODEC *dcp) |
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{ |
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memset(dcp, 0, sizeof(DEPTHCODEC)); |
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dcp->finp = stdin; |
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dcp->inpname = "<stdin>"; |
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dcp->format = 'a'; |
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dcp->refdepth = 1.; |
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dcp->depth_unit[0] = '1'; |
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dcp->vw = stdview; |
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dcp->res.rt = PIXSTANDARD; |
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if (!progname) progname = "depth_codec"; |
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} |
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/* process header line */ |
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static int |
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headline(char *s, void *p) |
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{ |
73 |
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DEPTHCODEC *dcp = (DEPTHCODEC *)p; |
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greg |
2.4 |
int rv; |
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greg |
2.1 |
|
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if (formatval(dcp->inpfmt, s)) /* don't pass format */ |
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return 0; |
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greg |
2.4 |
|
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if ((rv = isbigendian(s)) >= 0) { |
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dcp->swapped = (nativebigendian() != rv); |
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return 0; |
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} |
83 |
greg |
2.1 |
/* check for reference depth */ |
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if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) { |
85 |
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char *cp; |
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strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit)); |
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cp = dcp->depth_unit; |
88 |
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while (*cp) cp++; |
89 |
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while (cp > dcp->depth_unit && isspace(cp[-1])) cp--; |
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*cp = '\0'; |
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dcp->refdepth = atof(dcp->depth_unit); |
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if (dcp->refdepth <= .0) { |
93 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
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fputs(dcp->inpname, stderr); |
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fputs(": bad reference depth in input header\n", |
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stderr); |
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} |
98 |
greg |
2.1 |
return -1; |
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} |
100 |
greg |
2.6 |
} else if (!strncmp(s, "SAMP360=", 8)) |
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dcp->gotview--; |
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else if (isview(s)) /* get view params */ |
103 |
greg |
2.1 |
dcp->gotview += (sscanview(&dcp->vw, s) > 0); |
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if (dcp->hdrflags & HF_HEADOUT) |
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fputs(s, stdout); /* copy to standard output */ |
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return 1; |
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} |
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/* Load/copy header */ |
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int |
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process_dc_header(DEPTHCODEC *dcp, int ac, char *av[]) |
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{ |
114 |
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if (dcp->hdrflags & HF_HEADIN && |
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getheader(dcp->finp, headline, dcp) < 0) { |
116 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
117 |
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fputs(dcp->inpname, stderr); |
118 |
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fputs(": bad header\n", stderr); |
119 |
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} |
120 |
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return 0; |
121 |
greg |
2.1 |
} |
122 |
greg |
2.6 |
dcp->gotview *= (dcp->gotview > 0); |
123 |
greg |
2.1 |
if (dcp->hdrflags & HF_HEADOUT) { /* finish header */ |
124 |
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if (!(dcp->hdrflags & HF_HEADIN)) |
125 |
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newheader("RADIANCE", stdout); |
126 |
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if (ac > 0) |
127 |
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printargs(ac, av, stdout); |
128 |
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if (dcp->hdrflags & HF_ENCODE) { |
129 |
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fputs(DEPTHSTR, stdout); |
130 |
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fputs(dcp->depth_unit, stdout); |
131 |
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fputc('\n', stdout); |
132 |
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fputformat(DEPTH16FMT, stdout); |
133 |
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} else |
134 |
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switch (dcp->format) { |
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case 'a': |
136 |
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fputformat("ascii", stdout); |
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break; |
138 |
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case 'f': |
139 |
greg |
2.4 |
fputendian(stdout); |
140 |
greg |
2.1 |
fputformat("float", stdout); |
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break; |
142 |
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case 'd': |
143 |
greg |
2.4 |
fputendian(stdout); |
144 |
greg |
2.1 |
fputformat("double", stdout); |
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break; |
146 |
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} |
147 |
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fputc('\n', stdout); |
148 |
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} |
149 |
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/* get/put resolution string */ |
150 |
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if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) { |
151 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
152 |
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fputs(dcp->inpname, stderr); |
153 |
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fputs(": bad resolution string\n", stderr); |
154 |
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} |
155 |
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return 0; |
156 |
greg |
2.1 |
} |
157 |
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if (dcp->hdrflags & HF_RESOUT) |
158 |
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fputsresolu(&dcp->res, stdout); |
159 |
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160 |
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dcp->dstart = dcp->curpos = ftell(dcp->finp); |
161 |
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return 1; |
162 |
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} |
163 |
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164 |
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165 |
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/* Check that we have what we need to decode depths */ |
166 |
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int |
167 |
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check_decode_depths(DEPTHCODEC *dcp) |
168 |
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{ |
169 |
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if (dcp->hdrflags & HF_ENCODE) { |
170 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
171 |
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fputs(progname, stderr); |
172 |
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fputs(": wrong header mode for decode\n", stderr); |
173 |
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} |
174 |
greg |
2.1 |
return 0; |
175 |
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} |
176 |
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if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) { |
177 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
178 |
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fputs(dcp->inpname, stderr); |
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fputs(": unexpected input format: ", stderr); |
180 |
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fputs(dcp->inpfmt, stderr); |
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fputc('\n', stderr); |
182 |
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} |
183 |
greg |
2.1 |
return 0; |
184 |
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} |
185 |
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return 1; |
186 |
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} |
187 |
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188 |
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189 |
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/* Check that we have what we need to decode world positions */ |
190 |
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int |
191 |
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check_decode_worldpos(DEPTHCODEC *dcp) |
192 |
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{ |
193 |
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char *err; |
194 |
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195 |
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if (!check_decode_depths(dcp)) |
196 |
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return 0; |
197 |
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if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
198 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
199 |
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fputs(progname, stderr); |
200 |
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fputs(": missing map resolution\n", stderr); |
201 |
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} |
202 |
greg |
2.1 |
return 0; |
203 |
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} |
204 |
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if (!dcp->gotview) { |
205 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
206 |
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fputs(dcp->inpname, stderr); |
207 |
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fputs(": missing view\n", stderr); |
208 |
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} |
209 |
greg |
2.1 |
return 0; |
210 |
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} |
211 |
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if ((err = setview(&dcp->vw)) != NULL) { |
212 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
213 |
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fputs(dcp->inpname, stderr); |
214 |
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fputs(": input view error: ", stderr); |
215 |
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fputs(err, stderr); |
216 |
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fputc('\n', stderr); |
217 |
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} |
218 |
greg |
2.1 |
return 0; |
219 |
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} |
220 |
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return 1; |
221 |
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} |
222 |
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223 |
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224 |
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/* Decode next depth pixel */ |
225 |
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double |
226 |
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decode_depth_next(DEPTHCODEC *dcp) |
227 |
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{ |
228 |
greg |
2.5 |
int c; |
229 |
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230 |
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if (dcp->use_last) { |
231 |
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dcp->use_last = 0; |
232 |
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return code2depth(dcp->last_dc, dcp->refdepth); |
233 |
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} |
234 |
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c = getint(2, dcp->finp); |
235 |
greg |
2.1 |
|
236 |
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if (c == EOF && feof(dcp->finp)) |
237 |
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return -1.; |
238 |
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239 |
greg |
2.5 |
dcp->last_dc = c; |
240 |
greg |
2.1 |
dcp->curpos += 2; |
241 |
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242 |
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return code2depth(c, dcp->refdepth); |
243 |
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} |
244 |
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245 |
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246 |
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/* Compute world position from depth */ |
247 |
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int |
248 |
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compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d) |
249 |
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{ |
250 |
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RREAL loc[2]; |
251 |
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FVECT rdir; |
252 |
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253 |
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pix2loc(loc, &dcp->res, x, y); |
254 |
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255 |
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if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) { |
256 |
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VCOPY(wpos, dcp->vw.vp); |
257 |
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return 0; |
258 |
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} |
259 |
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VSUM(wpos, wpos, rdir, d); |
260 |
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return 1; |
261 |
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} |
262 |
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263 |
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264 |
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/* Decode the next world position */ |
265 |
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int |
266 |
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decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp) |
267 |
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{ |
268 |
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const long n = (dcp->curpos - dcp->dstart)>>1; |
269 |
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int x, y; |
270 |
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double d; |
271 |
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272 |
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d = decode_depth_next(dcp); |
273 |
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if (d < -FTINY) |
274 |
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return -1; |
275 |
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276 |
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x = scanlen(&dcp->res); |
277 |
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y = n / x; |
278 |
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x = n - (long)y*x; |
279 |
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280 |
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return compute_worldpos(wpos, dcp, x, y, d); |
281 |
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} |
282 |
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283 |
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284 |
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/* Seek to the indicated pixel position */ |
285 |
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int |
286 |
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seek_dc_pix(DEPTHCODEC *dcp, int x, int y) |
287 |
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{ |
288 |
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long seekpos; |
289 |
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290 |
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if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) { |
291 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
292 |
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fputs(progname, stderr); |
293 |
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fputs(": need map resolution to seek\n", stderr); |
294 |
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} |
295 |
greg |
2.1 |
return -1; |
296 |
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} |
297 |
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if ((x < 0) | (y < 0) || |
298 |
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(x >= scanlen(&dcp->res)) | (y >= numscans(&dcp->res))) { |
299 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
300 |
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fputs(dcp->inpname, stderr); |
301 |
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fputs(": warning - pixel index off map\n", stderr); |
302 |
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} |
303 |
greg |
2.1 |
return 0; |
304 |
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} |
305 |
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seekpos = dcp->dstart + 2*((long)y*scanlen(&dcp->res) + x); |
306 |
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307 |
greg |
2.5 |
if (seekpos == dcp->curpos-2) { |
308 |
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dcp->use_last++; /* avoids seek/read */ |
309 |
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return 1; |
310 |
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} |
311 |
greg |
2.1 |
if (seekpos != dcp->curpos && |
312 |
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fseek(dcp->finp, seekpos, SEEK_SET) == EOF) { |
313 |
greg |
2.2 |
if (dcp->hdrflags & HF_STDERR) { |
314 |
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fputs(dcp->inpname, stderr); |
315 |
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fputs(": seek error\n", stderr); |
316 |
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} |
317 |
greg |
2.1 |
return -1; |
318 |
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} |
319 |
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dcp->curpos = seekpos; |
320 |
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return 1; |
321 |
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} |
322 |
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323 |
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|
324 |
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/* Read and decode depth for the given pixel */ |
325 |
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double |
326 |
|
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decode_depth_pix(DEPTHCODEC *dcp, int x, int y) |
327 |
|
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{ |
328 |
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int rval = seek_dc_pix(dcp, x, y); |
329 |
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330 |
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if (rval < 0) |
331 |
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return -1.; |
332 |
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if (!rval) |
333 |
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return .0; |
334 |
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|
335 |
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return decode_depth_next(dcp); |
336 |
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} |
337 |
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|
338 |
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|
339 |
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/* Read and decode the world position at the given pixel */ |
340 |
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int |
341 |
|
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get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y) |
342 |
|
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{ |
343 |
|
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double d = decode_depth_pix(dcp, x, y); |
344 |
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345 |
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if (d < -FTINY) |
346 |
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return -1; |
347 |
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|
348 |
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return compute_worldpos(wpos, dcp, x, y, d); |
349 |
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} |