src/common/depthcodec.c

#ifndef lint
static const char RCSid[] = "$Id: depthcodec.c,v 2.9 2020/02/12 01:11:39 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 - 32768.999);
}
#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;
                }
                if (dcp->hdrflags & HF_ENCODE)
                        return 0;       /* will add this later */
        } 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;
        dcp->use_last = 0;
        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:	2.10
Committed:	Thu Mar 5 17:43:22 2020 UTC (5 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 2.9:	+2 -1 lines
Log Message:	Fixed bug in pathological case of two sequential calls to seek_dc_pix()
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.10	static const char RCSid[] = "$Id: depthcodec.c,v 2.9 2020/02/12 01:11:39 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	2.8	return (int)(32767.*d/dref - 32768.999);
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	2.9	if (dcp->hdrflags & HF_ENCODE)
101			return 0; /* will add this later */
102	greg	2.6	} else if (!strncmp(s, "SAMP360=", 8))
103			dcp->gotview--;
104			else if (isview(s)) /* get view params */
105	greg	2.1	dcp->gotview += (sscanview(&dcp->vw, s) > 0);
106			if (dcp->hdrflags & HF_HEADOUT)
107			fputs(s, stdout); /* copy to standard output */
108			return 1;
109			}
110
111
112			/* Load/copy header */
113			int
114			process_dc_header(DEPTHCODEC dcp, int ac, char av[])
115			{
116			if (dcp->hdrflags & HF_HEADIN &&
117			getheader(dcp->finp, headline, dcp) < 0) {
118	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
119			fputs(dcp->inpname, stderr);
120			fputs(": bad header\n", stderr);
121			}
122			return 0;
123	greg	2.1	}
124	greg	2.6	dcp->gotview *= (dcp->gotview > 0);
125	greg	2.1	if (dcp->hdrflags & HF_HEADOUT) { /* finish header */
126			if (!(dcp->hdrflags & HF_HEADIN))
127			newheader("RADIANCE", stdout);
128			if (ac > 0)
129			printargs(ac, av, stdout);
130			if (dcp->hdrflags & HF_ENCODE) {
131			fputs(DEPTHSTR, stdout);
132			fputs(dcp->depth_unit, stdout);
133			fputc('\n', stdout);
134			fputformat(DEPTH16FMT, stdout);
135			} else
136			switch (dcp->format) {
137			case 'a':
138			fputformat("ascii", stdout);
139			break;
140			case 'f':
141	greg	2.4	fputendian(stdout);
142	greg	2.1	fputformat("float", stdout);
143			break;
144			case 'd':
145	greg	2.4	fputendian(stdout);
146	greg	2.1	fputformat("double", stdout);
147			break;
148			}
149			fputc('\n', stdout);
150			}
151			/* get/put resolution string */
152			if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) {
153	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
154			fputs(dcp->inpname, stderr);
155			fputs(": bad resolution string\n", stderr);
156			}
157			return 0;
158	greg	2.1	}
159			if (dcp->hdrflags & HF_RESOUT)
160			fputsresolu(&dcp->res, stdout);
161
162			dcp->dstart = dcp->curpos = ftell(dcp->finp);
163			return 1;
164			}
165
166
167			/* Check that we have what we need to decode depths */
168			int
169			check_decode_depths(DEPTHCODEC *dcp)
170			{
171			if (dcp->hdrflags & HF_ENCODE) {
172	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
173			fputs(progname, stderr);
174			fputs(": wrong header mode for decode\n", stderr);
175			}
176	greg	2.1	return 0;
177			}
178			if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) {
179	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
180			fputs(dcp->inpname, stderr);
181			fputs(": unexpected input format: ", stderr);
182			fputs(dcp->inpfmt, stderr);
183			fputc('\n', stderr);
184			}
185	greg	2.1	return 0;
186			}
187			return 1;
188			}
189
190
191			/* Check that we have what we need to decode world positions */
192			int
193			check_decode_worldpos(DEPTHCODEC *dcp)
194			{
195			char *err;
196
197			if (!check_decode_depths(dcp))
198			return 0;
199			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
200	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
201			fputs(progname, stderr);
202			fputs(": missing map resolution\n", stderr);
203			}
204	greg	2.1	return 0;
205			}
206			if (!dcp->gotview) {
207	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
208			fputs(dcp->inpname, stderr);
209			fputs(": missing view\n", stderr);
210			}
211	greg	2.1	return 0;
212			}
213			if ((err = setview(&dcp->vw)) != NULL) {
214	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
215			fputs(dcp->inpname, stderr);
216			fputs(": input view error: ", stderr);
217			fputs(err, stderr);
218			fputc('\n', stderr);
219			}
220	greg	2.1	return 0;
221			}
222			return 1;
223			}
224
225
226			/* Decode next depth pixel */
227			double
228			decode_depth_next(DEPTHCODEC *dcp)
229			{
230	greg	2.5	int c;
231
232			if (dcp->use_last) {
233			dcp->use_last = 0;
234			return code2depth(dcp->last_dc, dcp->refdepth);
235			}
236			c = getint(2, dcp->finp);
237	greg	2.1
238			if (c == EOF && feof(dcp->finp))
239			return -1.;
240
241	greg	2.5	dcp->last_dc = c;
242	greg	2.1	dcp->curpos += 2;
243
244			return code2depth(c, dcp->refdepth);
245			}
246
247
248			/* Compute world position from depth */
249			int
250			compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d)
251			{
252			RREAL loc[2];
253			FVECT rdir;
254
255			pix2loc(loc, &dcp->res, x, y);
256
257			if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) {
258			VCOPY(wpos, dcp->vw.vp);
259			return 0;
260			}
261			VSUM(wpos, wpos, rdir, d);
262			return 1;
263			}
264
265
266			/* Decode the next world position */
267			int
268			decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp)
269			{
270			const long n = (dcp->curpos - dcp->dstart)>>1;
271			int x, y;
272			double d;
273
274			d = decode_depth_next(dcp);
275			if (d < -FTINY)
276			return -1;
277
278			x = scanlen(&dcp->res);
279			y = n / x;
280			x = n - (long)y*x;
281
282			return compute_worldpos(wpos, dcp, x, y, d);
283			}
284
285
286			/* Seek to the indicated pixel position */
287			int
288			seek_dc_pix(DEPTHCODEC *dcp, int x, int y)
289			{
290			long seekpos;
291
292			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
293	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
294			fputs(progname, stderr);
295			fputs(": need map resolution to seek\n", stderr);
296			}
297	greg	2.1	return -1;
298			}
299			if ((x < 0) \| (y < 0) \|\|
300			(x >= scanlen(&dcp->res)) \| (y >= numscans(&dcp->res))) {
301	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
302			fputs(dcp->inpname, stderr);
303			fputs(": warning - pixel index off map\n", stderr);
304			}
305	greg	2.1	return 0;
306			}
307			seekpos = dcp->dstart + 2((long)yscanlen(&dcp->res) + x);
308
309	greg	2.5	if (seekpos == dcp->curpos-2) {
310			dcp->use_last++; /* avoids seek/read */
311			return 1;
312			}
313	greg	2.1	if (seekpos != dcp->curpos &&
314			fseek(dcp->finp, seekpos, SEEK_SET) == EOF) {
315	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
316			fputs(dcp->inpname, stderr);
317			fputs(": seek error\n", stderr);
318			}
319	greg	2.1	return -1;
320			}
321			dcp->curpos = seekpos;
322	greg	2.10	dcp->use_last = 0;
323	greg	2.1	return 1;
324			}
325
326
327			/* Read and decode depth for the given pixel */
328			double
329			decode_depth_pix(DEPTHCODEC *dcp, int x, int y)
330			{
331			int rval = seek_dc_pix(dcp, x, y);
332
333			if (rval < 0)
334			return -1.;
335			if (!rval)
336			return .0;
337
338			return decode_depth_next(dcp);
339			}
340
341
342			/* Read and decode the world position at the given pixel */
343			int
344			get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y)
345			{
346			double d = decode_depth_pix(dcp, x, y);
347
348			if (d < -FTINY)
349			return -1;
350
351			return compute_worldpos(wpos, dcp, x, y, d);
352			}