src/common/depthcodec.c

#ifndef lint
static const char RCSid[] = "$Id: depthcodec.c,v 2.6 2020/01/10 01:02:14 greg Exp $";
#endif
/*
 * Routines to encode/decoded 16-bit depths
 */

#include "copyright.h"

#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include "rtio.h"
#include "fvect.h"
#include "depthcodec.h"


#ifndef depth2code
/* Encode depth as 16-bit signed integer */
int
depth2code(double d, double dref)
{
        if (d <= .0)
                return -32768;

        if (d > dref)
                return (int)(32768.001 - 32768.*dref/d) - 1;

        return (int)(32767.*d/dref - 32768.);
}
#endif


#ifndef code2depth
/* Decode depth from 16-bit signed integer */
double
code2depth(int c, double dref)
{
        if (c <= -32768)
                return .0;

        if (c >= 32767)
                return FHUGE;

        if (c >= -1)
                return dref*32768./(32766.5 - c);

        return dref*(32768.5 + c)*(1./32767.);
}
#endif


/* Set codec defaults */
void
set_dc_defaults(DEPTHCODEC *dcp)
{
        memset(dcp, 0, sizeof(DEPTHCODEC));
        dcp->finp = stdin;
        dcp->inpname = "<stdin>";
        dcp->format = 'a';
        dcp->refdepth = 1.;
        dcp->depth_unit[0] = '1';
        dcp->vw = stdview;
        dcp->res.rt = PIXSTANDARD;
        if (!progname) progname = "depth_codec";
}


/* process header line */
static int
headline(char *s, void *p)
{
        DEPTHCODEC      *dcp = (DEPTHCODEC *)p;
        int             rv;

        if (formatval(dcp->inpfmt, s))  /* don't pass format */
                return 0;

        if ((rv = isbigendian(s)) >= 0) {
                dcp->swapped = (nativebigendian() != rv);
                return 0;
        }
                                        /* check for reference depth */
        if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) {
                char    *cp;
                strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit));
                cp = dcp->depth_unit;
                while (*cp) cp++;
                while (cp > dcp->depth_unit && isspace(cp[-1])) cp--;
                *cp = '\0';
                dcp->refdepth = atof(dcp->depth_unit);
                if (dcp->refdepth <= .0) {
                        if (dcp->hdrflags & HF_STDERR) {
                                fputs(dcp->inpname, stderr);
                                fputs(": bad reference depth in input header\n",
                                                stderr);
                        }
                        return -1;
                }
        } else if (!strncmp(s, "SAMP360=", 8))
                dcp->gotview--;
        else if (isview(s))             /* get view params */
                dcp->gotview += (sscanview(&dcp->vw, s) > 0);
        if (dcp->hdrflags & HF_HEADOUT)
                fputs(s, stdout);       /* copy to standard output */
        return 1;
}


/* Load/copy header */
int
process_dc_header(DEPTHCODEC *dcp, int ac, char *av[])
{
        if (dcp->hdrflags & HF_HEADIN &&
                        getheader(dcp->finp, headline, dcp) < 0) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": bad header\n", stderr);
                }
                return 0;
        }
        dcp->gotview *= (dcp->gotview > 0);
        if (dcp->hdrflags & HF_HEADOUT) {       /* finish header */
                if (!(dcp->hdrflags & HF_HEADIN))
                        newheader("RADIANCE", stdout);
                if (ac > 0)
                        printargs(ac, av, stdout);
                if (dcp->hdrflags & HF_ENCODE) {
                        fputs(DEPTHSTR, stdout);
                        fputs(dcp->depth_unit, stdout);
                        fputc('\n', stdout);
                        fputformat(DEPTH16FMT, stdout);
                } else
                        switch (dcp->format) {
                        case 'a':
                                fputformat("ascii", stdout);
                                break;
                        case 'f':
                                fputendian(stdout);
                                fputformat("float", stdout);
                                break;
                        case 'd':
                                fputendian(stdout);
                                fputformat("double", stdout);
                                break;
                        }
                fputc('\n', stdout);
        }
                                        /* get/put resolution string */
        if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": bad resolution string\n", stderr);
                }
                return 0;
        }
        if (dcp->hdrflags & HF_RESOUT)
                fputsresolu(&dcp->res, stdout);

        dcp->dstart = dcp->curpos = ftell(dcp->finp);
        return 1;
}


/* Check that we have what we need to decode depths */
int
check_decode_depths(DEPTHCODEC *dcp)
{
        if (dcp->hdrflags & HF_ENCODE) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(progname, stderr);
                        fputs(": wrong header mode for decode\n", stderr);
                }
                return 0;
        }
        if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": unexpected input format: ", stderr);
                        fputs(dcp->inpfmt, stderr);
                        fputc('\n', stderr);
                }
                return 0;
        }
        return 1;
}


/* Check that we have what we need to decode world positions */
int
check_decode_worldpos(DEPTHCODEC *dcp)
{
        char    *err;

        if (!check_decode_depths(dcp))
                return 0;
        if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(progname, stderr);
                        fputs(": missing map resolution\n", stderr);
                }
                return 0;
        }
        if (!dcp->gotview) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": missing view\n", stderr);
                }
                return 0;
        }
        if ((err = setview(&dcp->vw)) != NULL) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": input view error: ", stderr);
                        fputs(err, stderr);
                        fputc('\n', stderr);
                }
                return 0;
        }
        return 1;       
}


/* Decode next depth pixel */
double
decode_depth_next(DEPTHCODEC *dcp)
{
        int     c;

        if (dcp->use_last) {
                dcp->use_last = 0;
                return code2depth(dcp->last_dc, dcp->refdepth);
        }
        c = getint(2, dcp->finp);

        if (c == EOF && feof(dcp->finp))
                return -1.;

        dcp->last_dc = c;
        dcp->curpos += 2;

        return code2depth(c, dcp->refdepth);
}


/* Compute world position from depth */
int
compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d)
{
        RREAL   loc[2];
        FVECT   rdir;

        pix2loc(loc, &dcp->res, x, y);

        if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) {
                VCOPY(wpos, dcp->vw.vp);
                return 0;
        }
        VSUM(wpos, wpos, rdir, d);
        return 1;
}


/* Decode the next world position */
int
decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp)
{
        const long      n = (dcp->curpos - dcp->dstart)>>1;
        int             x, y;
        double          d;

        d = decode_depth_next(dcp);
        if (d < -FTINY)
                return -1;

        x = scanlen(&dcp->res);
        y = n / x;
        x = n - (long)y*x;

        return compute_worldpos(wpos, dcp, x, y, d);
}


/* Seek to the indicated pixel position */
int
seek_dc_pix(DEPTHCODEC *dcp, int x, int y)
{
        long    seekpos;

        if ((dcp->res.xr <= 0) | (dcp->res.yr <= 0)) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(progname, stderr);
                        fputs(": need map resolution to seek\n", stderr);
                }
                return -1;
        }
        if ((x < 0) | (y < 0) ||
                        (x >= scanlen(&dcp->res)) | (y >= numscans(&dcp->res))) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": warning - pixel index off map\n", stderr);
                }
                return 0;
        }
        seekpos = dcp->dstart + 2*((long)y*scanlen(&dcp->res) + x);

        if (seekpos == dcp->curpos-2) {
                dcp->use_last++;        /* avoids seek/read */
                return 1;
        }
        if (seekpos != dcp->curpos &&
                        fseek(dcp->finp, seekpos, SEEK_SET) == EOF) {
                if (dcp->hdrflags & HF_STDERR) {
                        fputs(dcp->inpname, stderr);
                        fputs(": seek error\n", stderr);
                }
                return -1;
        }
        dcp->curpos = seekpos;
        return 1;
}


/* Read and decode depth for the given pixel */
double
decode_depth_pix(DEPTHCODEC *dcp, int x, int y)
{
        int     rval = seek_dc_pix(dcp, x, y);

        if (rval < 0)
                return -1.;
        if (!rval)
                return .0;

        return decode_depth_next(dcp);
}


/* Read and decode the world position at the given pixel */
int
get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y)
{
        double  d = decode_depth_pix(dcp, x, y);

        if (d < -FTINY)
                return -1;
        
        return compute_worldpos(wpos, dcp, x, y, d);
}
Revision:	2.7
Committed:	Sat Jan 25 02:36:25 2020 UTC (5 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+3 -3 lines
Log Message:	Correction to depth code near reference
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.7	static const char RCSid[] = "$Id: depthcodec.c,v 2.6 2020/01/10 01:02:14 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Routines to encode/decoded 16-bit depths
6			*/
7
8			#include "copyright.h"
9
10			#include <stdlib.h>
11			#include <math.h>
12			#include <ctype.h>
13			#include "rtio.h"
14			#include "fvect.h"
15			#include "depthcodec.h"
16
17
18	greg	2.3	#ifndef depth2code
19	greg	2.1	/* Encode depth as 16-bit signed integer */
20			int
21			depth2code(double d, double dref)
22			{
23			if (d <= .0)
24			return -32768;
25
26			if (d > dref)
27	greg	2.3	return (int)(32768.001 - 32768.*dref/d) - 1;
28	greg	2.1
29	greg	2.3	return (int)(32767.*d/dref - 32768.);
30	greg	2.1	}
31			#endif
32
33
34	greg	2.3	#ifndef code2depth
35	greg	2.1	/* Decode depth from 16-bit signed integer */
36			double
37			code2depth(int c, double dref)
38			{
39			if (c <= -32768)
40			return .0;
41
42			if (c >= 32767)
43			return FHUGE;
44	greg	2.5
45	greg	2.7	if (c >= -1)
46	greg	2.5	return dref*32768./(32766.5 - c);
47
48	greg	2.7	return dref(32768.5 + c)(1./32767.);
49	greg	2.1	}
50	greg	2.3	#endif
51	greg	2.1
52
53			/* Set codec defaults */
54			void
55			set_dc_defaults(DEPTHCODEC *dcp)
56			{
57			memset(dcp, 0, sizeof(DEPTHCODEC));
58			dcp->finp = stdin;
59			dcp->inpname = "<stdin>";
60			dcp->format = 'a';
61			dcp->refdepth = 1.;
62			dcp->depth_unit[0] = '1';
63			dcp->vw = stdview;
64			dcp->res.rt = PIXSTANDARD;
65			if (!progname) progname = "depth_codec";
66			}
67
68
69			/* process header line */
70			static int
71			headline(char s, void p)
72			{
73			DEPTHCODEC dcp = (DEPTHCODEC )p;
74	greg	2.4	int rv;
75	greg	2.1
76			if (formatval(dcp->inpfmt, s)) /* don't pass format */
77			return 0;
78	greg	2.4
79			if ((rv = isbigendian(s)) >= 0) {
80			dcp->swapped = (nativebigendian() != rv);
81			return 0;
82			}
83	greg	2.1	/* check for reference depth */
84			if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) {
85			char *cp;
86			strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit));
87			cp = dcp->depth_unit;
88			while (*cp) cp++;
89			while (cp > dcp->depth_unit && isspace(cp[-1])) cp--;
90			*cp = '\0';
91			dcp->refdepth = atof(dcp->depth_unit);
92			if (dcp->refdepth <= .0) {
93	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
94			fputs(dcp->inpname, stderr);
95			fputs(": bad reference depth in input header\n",
96			stderr);
97			}
98	greg	2.1	return -1;
99			}
100	greg	2.6	} else if (!strncmp(s, "SAMP360=", 8))
101			dcp->gotview--;
102			else if (isview(s)) /* get view params */
103	greg	2.1	dcp->gotview += (sscanview(&dcp->vw, s) > 0);
104			if (dcp->hdrflags & HF_HEADOUT)
105			fputs(s, stdout); /* copy to standard output */
106			return 1;
107			}
108
109
110			/* Load/copy header */
111			int
112			process_dc_header(DEPTHCODEC dcp, int ac, char av[])
113			{
114			if (dcp->hdrflags & HF_HEADIN &&
115			getheader(dcp->finp, headline, dcp) < 0) {
116	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
117			fputs(dcp->inpname, stderr);
118			fputs(": bad header\n", stderr);
119			}
120			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			if (!(dcp->hdrflags & HF_HEADIN))
125			newheader("RADIANCE", stdout);
126			if (ac > 0)
127			printargs(ac, av, stdout);
128			if (dcp->hdrflags & HF_ENCODE) {
129			fputs(DEPTHSTR, stdout);
130			fputs(dcp->depth_unit, stdout);
131			fputc('\n', stdout);
132			fputformat(DEPTH16FMT, stdout);
133			} else
134			switch (dcp->format) {
135			case 'a':
136			fputformat("ascii", stdout);
137			break;
138			case 'f':
139	greg	2.4	fputendian(stdout);
140	greg	2.1	fputformat("float", stdout);
141			break;
142			case 'd':
143	greg	2.4	fputendian(stdout);
144	greg	2.1	fputformat("double", stdout);
145			break;
146			}
147			fputc('\n', stdout);
148			}
149			/* get/put resolution string */
150			if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) {
151	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
152			fputs(dcp->inpname, stderr);
153			fputs(": bad resolution string\n", stderr);
154			}
155			return 0;
156	greg	2.1	}
157			if (dcp->hdrflags & HF_RESOUT)
158			fputsresolu(&dcp->res, stdout);
159
160			dcp->dstart = dcp->curpos = ftell(dcp->finp);
161			return 1;
162			}
163
164
165			/* Check that we have what we need to decode depths */
166			int
167			check_decode_depths(DEPTHCODEC *dcp)
168			{
169			if (dcp->hdrflags & HF_ENCODE) {
170	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
171			fputs(progname, stderr);
172			fputs(": wrong header mode for decode\n", stderr);
173			}
174	greg	2.1	return 0;
175			}
176			if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) {
177	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
178			fputs(dcp->inpname, stderr);
179			fputs(": unexpected input format: ", stderr);
180			fputs(dcp->inpfmt, stderr);
181			fputc('\n', stderr);
182			}
183	greg	2.1	return 0;
184			}
185			return 1;
186			}
187
188
189			/* Check that we have what we need to decode world positions */
190			int
191			check_decode_worldpos(DEPTHCODEC *dcp)
192			{
193			char *err;
194
195			if (!check_decode_depths(dcp))
196			return 0;
197			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
198	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
199			fputs(progname, stderr);
200			fputs(": missing map resolution\n", stderr);
201			}
202	greg	2.1	return 0;
203			}
204			if (!dcp->gotview) {
205	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
206			fputs(dcp->inpname, stderr);
207			fputs(": missing view\n", stderr);
208			}
209	greg	2.1	return 0;
210			}
211			if ((err = setview(&dcp->vw)) != NULL) {
212	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
213			fputs(dcp->inpname, stderr);
214			fputs(": input view error: ", stderr);
215			fputs(err, stderr);
216			fputc('\n', stderr);
217			}
218	greg	2.1	return 0;
219			}
220			return 1;
221			}
222
223
224			/* Decode next depth pixel */
225			double
226			decode_depth_next(DEPTHCODEC *dcp)
227			{
228	greg	2.5	int c;
229
230			if (dcp->use_last) {
231			dcp->use_last = 0;
232			return code2depth(dcp->last_dc, dcp->refdepth);
233			}
234			c = getint(2, dcp->finp);
235	greg	2.1
236			if (c == EOF && feof(dcp->finp))
237			return -1.;
238
239	greg	2.5	dcp->last_dc = c;
240	greg	2.1	dcp->curpos += 2;
241
242			return code2depth(c, dcp->refdepth);
243			}
244
245
246			/* Compute world position from depth */
247			int
248			compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d)
249			{
250			RREAL loc[2];
251			FVECT rdir;
252
253			pix2loc(loc, &dcp->res, x, y);
254
255			if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) {
256			VCOPY(wpos, dcp->vw.vp);
257			return 0;
258			}
259			VSUM(wpos, wpos, rdir, d);
260			return 1;
261			}
262
263
264			/* Decode the next world position */
265			int
266			decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp)
267			{
268			const long n = (dcp->curpos - dcp->dstart)>>1;
269			int x, y;
270			double d;
271
272			d = decode_depth_next(dcp);
273			if (d < -FTINY)
274			return -1;
275
276			x = scanlen(&dcp->res);
277			y = n / x;
278			x = n - (long)y*x;
279
280			return compute_worldpos(wpos, dcp, x, y, d);
281			}
282
283
284			/* Seek to the indicated pixel position */
285			int
286			seek_dc_pix(DEPTHCODEC *dcp, int x, int y)
287			{
288			long seekpos;
289
290			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
291	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
292			fputs(progname, stderr);
293			fputs(": need map resolution to seek\n", stderr);
294			}
295	greg	2.1	return -1;
296			}
297			if ((x < 0) \| (y < 0) \|\|
298			(x >= scanlen(&dcp->res)) \| (y >= numscans(&dcp->res))) {
299	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
300			fputs(dcp->inpname, stderr);
301			fputs(": warning - pixel index off map\n", stderr);
302			}
303	greg	2.1	return 0;
304			}
305			seekpos = dcp->dstart + 2((long)yscanlen(&dcp->res) + x);
306
307	greg	2.5	if (seekpos == dcp->curpos-2) {
308			dcp->use_last++; /* avoids seek/read */
309			return 1;
310			}
311	greg	2.1	if (seekpos != dcp->curpos &&
312			fseek(dcp->finp, seekpos, SEEK_SET) == EOF) {
313	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
314			fputs(dcp->inpname, stderr);
315			fputs(": seek error\n", stderr);
316			}
317	greg	2.1	return -1;
318			}
319			dcp->curpos = seekpos;
320			return 1;
321			}
322
323
324			/* Read and decode depth for the given pixel */
325			double
326			decode_depth_pix(DEPTHCODEC *dcp, int x, int y)
327			{
328			int rval = seek_dc_pix(dcp, x, y);
329
330			if (rval < 0)
331			return -1.;
332			if (!rval)
333			return .0;
334
335			return decode_depth_next(dcp);
336			}
337
338
339			/* Read and decode the world position at the given pixel */
340			int
341			get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y)
342			{
343			double d = decode_depth_pix(dcp, x, y);
344
345			if (d < -FTINY)
346			return -1;
347
348			return compute_worldpos(wpos, dcp, x, y, d);
349			}