src/common/normcodec.c

#ifndef lint
static const char RCSid[] = "$Id: normcodec.c,v 2.1 2019/07/26 16:18:06 greg Exp $";
#endif
/*
 * Routines to encode/decode 32-bit normals
 */

#include "copyright.h"

#include "rtio.h"
#include "rtmath.h"
#include "normcodec.h"


/* Set codec defaults */
void
set_nc_defaults(NORMCODEC *ncp)
{
        memset(ncp, 0, sizeof(NORMCODEC));
        ncp->finp = stdin;
        ncp->inpname = "<stdin>";
        ncp->format = 'a';
        ncp->res.rt = PIXSTANDARD;
        if (!progname) progname = "norm_codec";
}


/* process header line */
static int
headline(char *s, void *p)
{
        NORMCODEC       *ncp = (NORMCODEC *)p;

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

        if (ncp->hdrflags & HF_HEADOUT)
                fputs(s, stdout);       /* copy to standard output */
        return 1;
}


/* Load/copy header */
int
process_nc_header(NORMCODEC *ncp, int ac, char *av[])
{
        if (ncp->hdrflags & HF_HEADIN &&
                        getheader(ncp->finp, headline, ncp) < 0) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": bad header\n", stderr);
                }
                return 0;
        }
        if (ncp->hdrflags & HF_HEADOUT) {       /* finish header */
                if (!(ncp->hdrflags & HF_HEADIN))
                        newheader("RADIANCE", stdout);
                if (ac > 0)
                        printargs(ac, av, stdout);
                if (ncp->hdrflags & HF_ENCODE) {
                        fputformat(NORMAL32FMT, stdout);
                } else
                        switch (ncp->format) {
                        case 'a':
                                fputformat("ascii", stdout);
                                break;
                        case 'f':
                                fputformat("float", stdout);
                                break;
                        case 'd':
                                fputformat("double", stdout);
                                break;
                        }
                fputc('\n', stdout);
        }
                                        /* get/put resolution string */
        if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": bad resolution string\n", stderr);
                }
                return 0;
        }
        if (ncp->hdrflags & HF_RESOUT)
                fputsresolu(&ncp->res, stdout);

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


/* Check that we have what we need to decode normals */
int
check_decode_normals(NORMCODEC *ncp)
{
        if (ncp->hdrflags & HF_ENCODE) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(progname, stderr);
                        fputs(": wrong header mode for decode\n", stderr);
                }
                return 0;
        }
        if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": unexpected input format: ", stderr);
                        fputs(ncp->inpfmt, stderr);
                        fputc('\n', stderr);
                }
                return 0;
        }
        return 1;
}


/* Decode next normal from input */
int
decode_normal_next(FVECT nrm, NORMCODEC *ncp)
{
        int32   c = getint(4, ncp->finp);

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

        ncp->curpos += 4;

        decodedir(nrm, c);

        return (c != 0);
}


/* Seek to the indicated pixel position */
int
seek_nc_pix(NORMCODEC *ncp, int x, int y)
{
        long    seekpos;

        if ((ncp->res.xr <= 0) | (ncp->res.yr <= 0)) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(progname, stderr);
                        fputs(": need map resolution to seek\n", stderr);
                }
                return -1;
        }
        if ((x < 0) | (y < 0) ||
                        (x >= scanlen(&ncp->res)) | (y >= numscans(&ncp->res))) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": warning - pixel index off map\n", stderr);
                }
                return 0;
        }
        seekpos = ncp->dstart + 4*((long)y*scanlen(&ncp->res) + x);

        if (seekpos != ncp->curpos &&
                        fseek(ncp->finp, seekpos, SEEK_SET) == EOF) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": seek error\n", stderr);
                }
                return -1;
        }
        ncp->curpos = seekpos;
        return 1;
}


/* Read and decode normal for the given pixel */
int
decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y)
{
        int     rval = seek_nc_pix(ncp, x, y);

        if (rval < 0)
                return -1;

        if (!rval) {
                nrm[0] = nrm[1] = nrm[2] = .0;
                return 0;
        }
        return decode_normal_next(nrm, ncp);
}
Revision:	2.2
Committed:	Fri Jul 26 17:04:12 2019 UTC (4 years, 9 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.1:	+33 -19 lines
Log Message:	Added control for stderr output
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.2	static const char RCSid[] = "$Id: normcodec.c,v 2.1 2019/07/26 16:18:06 greg Exp $";
3	greg	2.1	#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->res.rt = PIXSTANDARD;
24			if (!progname) progname = "norm_codec";
25			}
26
27
28			/* process header line */
29			static int
30			headline(char s, void p)
31			{
32			NORMCODEC ncp = (NORMCODEC )p;
33
34			if (formatval(ncp->inpfmt, s)) /* don't pass format */
35			return 0;
36
37			if (ncp->hdrflags & HF_HEADOUT)
38			fputs(s, stdout); /* copy to standard output */
39			return 1;
40			}
41
42
43			/* Load/copy header */
44			int
45			process_nc_header(NORMCODEC ncp, int ac, char av[])
46			{
47			if (ncp->hdrflags & HF_HEADIN &&
48			getheader(ncp->finp, headline, ncp) < 0) {
49	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
50			fputs(ncp->inpname, stderr);
51			fputs(": bad header\n", stderr);
52			}
53			return 0;
54	greg	2.1	}
55			if (ncp->hdrflags & HF_HEADOUT) { /* finish header */
56			if (!(ncp->hdrflags & HF_HEADIN))
57			newheader("RADIANCE", stdout);
58			if (ac > 0)
59			printargs(ac, av, stdout);
60			if (ncp->hdrflags & HF_ENCODE) {
61			fputformat(NORMAL32FMT, stdout);
62			} else
63			switch (ncp->format) {
64			case 'a':
65			fputformat("ascii", stdout);
66			break;
67			case 'f':
68			fputformat("float", stdout);
69			break;
70			case 'd':
71			fputformat("double", stdout);
72			break;
73			}
74			fputc('\n', stdout);
75			}
76			/* get/put resolution string */
77			if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) {
78	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
79			fputs(ncp->inpname, stderr);
80			fputs(": bad resolution string\n", stderr);
81			}
82			return 0;
83	greg	2.1	}
84			if (ncp->hdrflags & HF_RESOUT)
85			fputsresolu(&ncp->res, stdout);
86
87			ncp->dstart = ncp->curpos = ftell(ncp->finp);
88			return 1;
89			}
90
91
92			/* Check that we have what we need to decode normals */
93			int
94			check_decode_normals(NORMCODEC *ncp)
95			{
96			if (ncp->hdrflags & HF_ENCODE) {
97	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
98			fputs(progname, stderr);
99			fputs(": wrong header mode for decode\n", stderr);
100			}
101	greg	2.1	return 0;
102			}
103			if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) {
104	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
105			fputs(ncp->inpname, stderr);
106			fputs(": unexpected input format: ", stderr);
107			fputs(ncp->inpfmt, stderr);
108			fputc('\n', stderr);
109			}
110	greg	2.1	return 0;
111			}
112			return 1;
113			}
114
115
116			/* Decode next normal from input */
117			int
118			decode_normal_next(FVECT nrm, NORMCODEC *ncp)
119			{
120			int32 c = getint(4, ncp->finp);
121
122			if (c == EOF && feof(ncp->finp))
123			return -1;
124
125			ncp->curpos += 4;
126
127			decodedir(nrm, c);
128
129			return (c != 0);
130			}
131
132
133			/* Seek to the indicated pixel position */
134			int
135			seek_nc_pix(NORMCODEC *ncp, int x, int y)
136			{
137			long seekpos;
138
139			if ((ncp->res.xr <= 0) \| (ncp->res.yr <= 0)) {
140	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
141			fputs(progname, stderr);
142			fputs(": need map resolution to seek\n", stderr);
143			}
144	greg	2.1	return -1;
145			}
146			if ((x < 0) \| (y < 0) \|\|
147			(x >= scanlen(&ncp->res)) \| (y >= numscans(&ncp->res))) {
148	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
149			fputs(ncp->inpname, stderr);
150			fputs(": warning - pixel index off map\n", stderr);
151			}
152	greg	2.1	return 0;
153			}
154			seekpos = ncp->dstart + 4((long)yscanlen(&ncp->res) + x);
155
156			if (seekpos != ncp->curpos &&
157			fseek(ncp->finp, seekpos, SEEK_SET) == EOF) {
158	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
159			fputs(ncp->inpname, stderr);
160			fputs(": seek error\n", stderr);
161			}
162	greg	2.1	return -1;
163			}
164			ncp->curpos = seekpos;
165			return 1;
166			}
167
168
169			/* Read and decode normal for the given pixel */
170			int
171			decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y)
172			{
173			int rval = seek_nc_pix(ncp, x, y);
174
175			if (rval < 0)
176			return -1;
177
178			if (!rval) {
179			nrm[0] = nrm[1] = nrm[2] = .0;
180			return 0;
181			}
182			return decode_normal_next(nrm, ncp);
183			}