src/common/depthcodec.c

#ifndef lint
static const char RCSid[] = "$Id: depthcodec.c,v 2.3 2019/07/26 18:52:32 greg Exp $";
#endif
/*
 * Routines to encode/decoded 16-bit depths
 */

#include "copyright.h"

#include <stdlib.h>
#include <string.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 < 0)
                return dref*(32767.5 + c)*(1./32767.);
        
        return dref*32768./(32766.5 - c);
}
#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->swapped = 0;
        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 (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;
        }
        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 = getint(2, dcp->finp);

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

        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 &&
                        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:	2.4
Committed:	Wed Aug 14 21:00:14 2019 UTC (4 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.3:	+10 -1 lines
Log Message:	Added byte order to gendaymtx, rsplit, dctimestep, rcode_depth, and rcode_normal
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.4	static const char RCSid[] = "$Id: depthcodec.c,v 2.3 2019/07/26 18:52:32 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 <string.h>
12			#include <math.h>
13			#include <ctype.h>
14			#include "rtio.h"
15			#include "fvect.h"
16			#include "depthcodec.h"
17
18
19	greg	2.3	#ifndef depth2code
20	greg	2.1	/* Encode depth as 16-bit signed integer */
21			int
22			depth2code(double d, double dref)
23			{
24			if (d <= .0)
25			return -32768;
26
27			if (d > dref)
28	greg	2.3	return (int)(32768.001 - 32768.*dref/d) - 1;
29	greg	2.1
30	greg	2.3	return (int)(32767.*d/dref - 32768.);
31	greg	2.1	}
32			#endif
33
34
35	greg	2.3	#ifndef code2depth
36	greg	2.1	/* Decode depth from 16-bit signed integer */
37			double
38			code2depth(int c, double dref)
39			{
40			if (c <= -32768)
41			return .0;
42
43			if (c >= 32767)
44			return FHUGE;
45
46			if (c < 0)
47			return dref(32767.5 + c)(1./32767.);
48
49			return dref*32768./(32766.5 - c);
50			}
51	greg	2.3	#endif
52	greg	2.1
53
54			/* Set codec defaults */
55			void
56			set_dc_defaults(DEPTHCODEC *dcp)
57			{
58			memset(dcp, 0, sizeof(DEPTHCODEC));
59			dcp->finp = stdin;
60			dcp->inpname = "<stdin>";
61			dcp->format = 'a';
62	greg	2.4	dcp->swapped = 0;
63	greg	2.1	dcp->refdepth = 1.;
64			dcp->depth_unit[0] = '1';
65			dcp->vw = stdview;
66			dcp->res.rt = PIXSTANDARD;
67			if (!progname) progname = "depth_codec";
68			}
69
70
71			/* process header line */
72			static int
73			headline(char s, void p)
74			{
75			DEPTHCODEC dcp = (DEPTHCODEC )p;
76	greg	2.4	int rv;
77	greg	2.1
78			if (formatval(dcp->inpfmt, s)) /* don't pass format */
79			return 0;
80	greg	2.4
81			if ((rv = isbigendian(s)) >= 0) {
82			dcp->swapped = (nativebigendian() != rv);
83			return 0;
84			}
85	greg	2.1	/* check for reference depth */
86			if (!strncmp(s, DEPTHSTR, LDEPTHSTR)) {
87			char *cp;
88			strlcpy(dcp->depth_unit, s+LDEPTHSTR, sizeof(dcp->depth_unit));
89			cp = dcp->depth_unit;
90			while (*cp) cp++;
91			while (cp > dcp->depth_unit && isspace(cp[-1])) cp--;
92			*cp = '\0';
93			dcp->refdepth = atof(dcp->depth_unit);
94			if (dcp->refdepth <= .0) {
95	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
96			fputs(dcp->inpname, stderr);
97			fputs(": bad reference depth in input header\n",
98			stderr);
99			}
100	greg	2.1	return -1;
101			}
102			} else if (isview(s)) /* get view params */
103			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			if (dcp->hdrflags & HF_HEADOUT) { /* finish header */
123			if (!(dcp->hdrflags & HF_HEADIN))
124			newheader("RADIANCE", stdout);
125			if (ac > 0)
126			printargs(ac, av, stdout);
127			if (dcp->hdrflags & HF_ENCODE) {
128			fputs(DEPTHSTR, stdout);
129			fputs(dcp->depth_unit, stdout);
130			fputc('\n', stdout);
131			fputformat(DEPTH16FMT, stdout);
132			} else
133			switch (dcp->format) {
134			case 'a':
135			fputformat("ascii", stdout);
136			break;
137			case 'f':
138	greg	2.4	fputendian(stdout);
139	greg	2.1	fputformat("float", stdout);
140			break;
141			case 'd':
142	greg	2.4	fputendian(stdout);
143	greg	2.1	fputformat("double", stdout);
144			break;
145			}
146			fputc('\n', stdout);
147			}
148			/* get/put resolution string */
149			if (dcp->hdrflags & HF_RESIN && !fgetsresolu(&dcp->res, dcp->finp)) {
150	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
151			fputs(dcp->inpname, stderr);
152			fputs(": bad resolution string\n", stderr);
153			}
154			return 0;
155	greg	2.1	}
156			if (dcp->hdrflags & HF_RESOUT)
157			fputsresolu(&dcp->res, stdout);
158
159			dcp->dstart = dcp->curpos = ftell(dcp->finp);
160			return 1;
161			}
162
163
164			/* Check that we have what we need to decode depths */
165			int
166			check_decode_depths(DEPTHCODEC *dcp)
167			{
168			if (dcp->hdrflags & HF_ENCODE) {
169	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
170			fputs(progname, stderr);
171			fputs(": wrong header mode for decode\n", stderr);
172			}
173	greg	2.1	return 0;
174			}
175			if (dcp->inpfmt[0] && strcmp(dcp->inpfmt, DEPTH16FMT)) {
176	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
177			fputs(dcp->inpname, stderr);
178			fputs(": unexpected input format: ", stderr);
179			fputs(dcp->inpfmt, stderr);
180			fputc('\n', stderr);
181			}
182	greg	2.1	return 0;
183			}
184			return 1;
185			}
186
187
188			/* Check that we have what we need to decode world positions */
189			int
190			check_decode_worldpos(DEPTHCODEC *dcp)
191			{
192			char *err;
193
194			if (!check_decode_depths(dcp))
195			return 0;
196			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
197	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
198			fputs(progname, stderr);
199			fputs(": missing map resolution\n", stderr);
200			}
201	greg	2.1	return 0;
202			}
203			if (!dcp->gotview) {
204	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
205			fputs(dcp->inpname, stderr);
206			fputs(": missing view\n", stderr);
207			}
208	greg	2.1	return 0;
209			}
210			if ((err = setview(&dcp->vw)) != NULL) {
211	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
212			fputs(dcp->inpname, stderr);
213			fputs(": input view error: ", stderr);
214			fputs(err, stderr);
215			fputc('\n', stderr);
216			}
217	greg	2.1	return 0;
218			}
219			return 1;
220			}
221
222
223			/* Decode next depth pixel */
224			double
225			decode_depth_next(DEPTHCODEC *dcp)
226			{
227			int c = getint(2, dcp->finp);
228
229			if (c == EOF && feof(dcp->finp))
230			return -1.;
231
232			dcp->curpos += 2;
233
234			return code2depth(c, dcp->refdepth);
235			}
236
237
238			/* Compute world position from depth */
239			int
240			compute_worldpos(FVECT wpos, DEPTHCODEC *dcp, int x, int y, double d)
241			{
242			RREAL loc[2];
243			FVECT rdir;
244
245			pix2loc(loc, &dcp->res, x, y);
246
247			if (viewray(wpos, rdir, &dcp->vw, loc[0], loc[1]) < -FTINY) {
248			VCOPY(wpos, dcp->vw.vp);
249			return 0;
250			}
251			VSUM(wpos, wpos, rdir, d);
252			return 1;
253			}
254
255
256			/* Decode the next world position */
257			int
258			decode_worldpos_next(FVECT wpos, DEPTHCODEC *dcp)
259			{
260			const long n = (dcp->curpos - dcp->dstart)>>1;
261			int x, y;
262			double d;
263
264			d = decode_depth_next(dcp);
265			if (d < -FTINY)
266			return -1;
267
268			x = scanlen(&dcp->res);
269			y = n / x;
270			x = n - (long)y*x;
271
272			return compute_worldpos(wpos, dcp, x, y, d);
273			}
274
275
276			/* Seek to the indicated pixel position */
277			int
278			seek_dc_pix(DEPTHCODEC *dcp, int x, int y)
279			{
280			long seekpos;
281
282			if ((dcp->res.xr <= 0) \| (dcp->res.yr <= 0)) {
283	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
284			fputs(progname, stderr);
285			fputs(": need map resolution to seek\n", stderr);
286			}
287	greg	2.1	return -1;
288			}
289			if ((x < 0) \| (y < 0) \|\|
290			(x >= scanlen(&dcp->res)) \| (y >= numscans(&dcp->res))) {
291	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
292			fputs(dcp->inpname, stderr);
293			fputs(": warning - pixel index off map\n", stderr);
294			}
295	greg	2.1	return 0;
296			}
297			seekpos = dcp->dstart + 2((long)yscanlen(&dcp->res) + x);
298
299			if (seekpos != dcp->curpos &&
300			fseek(dcp->finp, seekpos, SEEK_SET) == EOF) {
301	greg	2.2	if (dcp->hdrflags & HF_STDERR) {
302			fputs(dcp->inpname, stderr);
303			fputs(": seek error\n", stderr);
304			}
305	greg	2.1	return -1;
306			}
307			dcp->curpos = seekpos;
308			return 1;
309			}
310
311
312			/* Read and decode depth for the given pixel */
313			double
314			decode_depth_pix(DEPTHCODEC *dcp, int x, int y)
315			{
316			int rval = seek_dc_pix(dcp, x, y);
317
318			if (rval < 0)
319			return -1.;
320			if (!rval)
321			return .0;
322
323			return decode_depth_next(dcp);
324			}
325
326
327			/* Read and decode the world position at the given pixel */
328			int
329			get_worldpos_pix(FVECT wpos, DEPTHCODEC *dcp, int x, int y)
330			{
331			double d = decode_depth_pix(dcp, x, y);
332
333			if (d < -FTINY)
334			return -1;
335
336			return compute_worldpos(wpos, dcp, x, y, d);
337			}