src/common/normcodec.c

#ifndef lint
static const char RCSid[] = "$Id: normcodec.c,v 2.7 2022/08/24 19:55:58 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;
        int             rv;

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

        if ((rv = isbigendian(s)) >= 0) {
                ncp->swapped = (nativebigendian() != rv);
                return 0;
        }
        if (!strncmp(s, "NCOMP=", 6)) {
                if (atoi(s+6) != 3) {
                        if (ncp->hdrflags & HF_STDERR) {
                                fputs(ncp->inpname, stderr);
                                fputs(": NCOMP must equal 3\n", stderr);
                        }
                        return -1;
                }
                return 0;
        }
        if (!strncmp(s, "NROWS=", 6)) {
                ncp->res.yr = atoi(s+6);
                return 0;
        }
        if (!strncmp(s, "NCOLS=", 6)) {
                ncp->res.xr = atoi(s+6);
                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;
        }
                                        /* get resolution string? */
        if (ncp->hdrflags & HF_RESIN &&
                        (ncp->res.xr <= 0) | (ncp->res.yr <= 0) &&
                        !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_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 {
                        fputs("NCOMP=3\n", stdout);
                        if ((ncp->hdrflags & (HF_RESIN|HF_RESOUT)) == HF_RESIN)
                                printf("NCOLS=%d\nNROWS=%d\n",
                                                scanlen(&ncp->res),
                                                numscans(&ncp->res));
                        switch (ncp->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);
        }
        if (ncp->hdrflags & HF_RESOUT)  /* put resolution string? */
                fputsresolu(&ncp->res, stdout);

        ncp->dstart = 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)
{
        static int32    lastc;
        static FVECT    lastv;
        int32           c = getint(4, ncp->finp);

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

        if (c == lastc) {                       /* optimization */
                VCOPY(nrm, lastv);
        } else {
                decodedir(nrm, c);
                if (c) {
                        lastc = c;
                        VCOPY(lastv, nrm);
                }
        }
        return (c != 0);
}


/* Seek to the indicated pixel position */
int
seek_nc_pix(NORMCODEC *ncp, int x, int y)
{
        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;
        }
        if (fseek(ncp->finp, ncp->dstart + 4*((long)y*scanlen(&ncp->res) + x),
                        SEEK_SET) == EOF) {
                if (ncp->hdrflags & HF_STDERR) {
                        fputs(ncp->inpname, stderr);
                        fputs(": seek error\n", stderr);
                }
                return -1;
        }
        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:	2.8
Committed:	Thu Sep 22 21:45:28 2022 UTC (20 months, 1 week ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.7:	+22 -2 lines
Log Message:	feat(rcode_depth,rcode_norm): Allow NROWS,NCOLS in header rather than res string
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.8	static const char RCSid[] = "$Id: normcodec.c,v 2.7 2022/08/24 19:55:58 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	greg	2.3	int rv;
34	greg	2.1
35			if (formatval(ncp->inpfmt, s)) /* don't pass format */
36			return 0;
37
38	greg	2.3	if ((rv = isbigendian(s)) >= 0) {
39			ncp->swapped = (nativebigendian() != rv);
40			return 0;
41			}
42	greg	2.8	if (!strncmp(s, "NCOMP=", 6)) {
43			if (atoi(s+6) != 3) {
44			if (ncp->hdrflags & HF_STDERR) {
45			fputs(ncp->inpname, stderr);
46			fputs(": NCOMP must equal 3\n", stderr);
47			}
48			return -1;
49			}
50			return 0;
51			}
52			if (!strncmp(s, "NROWS=", 6)) {
53			ncp->res.yr = atoi(s+6);
54			return 0;
55			}
56			if (!strncmp(s, "NCOLS=", 6)) {
57			ncp->res.xr = atoi(s+6);
58			return 0;
59			}
60	greg	2.1	if (ncp->hdrflags & HF_HEADOUT)
61			fputs(s, stdout); /* copy to standard output */
62			return 1;
63			}
64
65
66			/* Load/copy header */
67			int
68			process_nc_header(NORMCODEC ncp, int ac, char av[])
69			{
70			if (ncp->hdrflags & HF_HEADIN &&
71			getheader(ncp->finp, headline, ncp) < 0) {
72	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
73			fputs(ncp->inpname, stderr);
74			fputs(": bad header\n", stderr);
75			}
76			return 0;
77	greg	2.1	}
78	greg	2.6	/* get resolution string? */
79	greg	2.8	if (ncp->hdrflags & HF_RESIN &&
80			(ncp->res.xr <= 0) \| (ncp->res.yr <= 0) &&
81			!fgetsresolu(&ncp->res, ncp->finp)) {
82	greg	2.6	if (ncp->hdrflags & HF_STDERR) {
83			fputs(ncp->inpname, stderr);
84			fputs(": bad resolution string\n", stderr);
85			}
86			return 0;
87			}
88	greg	2.1	if (ncp->hdrflags & HF_HEADOUT) { /* finish header */
89			if (!(ncp->hdrflags & HF_HEADIN))
90			newheader("RADIANCE", stdout);
91			if (ac > 0)
92			printargs(ac, av, stdout);
93			if (ncp->hdrflags & HF_ENCODE) {
94			fputformat(NORMAL32FMT, stdout);
95	greg	2.6	} else {
96			fputs("NCOMP=3\n", stdout);
97			if ((ncp->hdrflags & (HF_RESIN\|HF_RESOUT)) == HF_RESIN)
98			printf("NCOLS=%d\nNROWS=%d\n",
99			scanlen(&ncp->res),
100			numscans(&ncp->res));
101	greg	2.1	switch (ncp->format) {
102			case 'a':
103			fputformat("ascii", stdout);
104			break;
105			case 'f':
106	greg	2.3	fputendian(stdout);
107	greg	2.1	fputformat("float", stdout);
108			break;
109			case 'd':
110	greg	2.3	fputendian(stdout);
111	greg	2.1	fputformat("double", stdout);
112			break;
113			}
114	greg	2.6	}
115	greg	2.1	fputc('\n', stdout);
116			}
117	greg	2.6	if (ncp->hdrflags & HF_RESOUT) /* put resolution string? */
118	greg	2.1	fputsresolu(&ncp->res, stdout);
119
120	greg	2.7	ncp->dstart = ftell(ncp->finp);
121	greg	2.1	return 1;
122			}
123
124
125			/* Check that we have what we need to decode normals */
126			int
127			check_decode_normals(NORMCODEC *ncp)
128			{
129			if (ncp->hdrflags & HF_ENCODE) {
130	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
131			fputs(progname, stderr);
132			fputs(": wrong header mode for decode\n", stderr);
133			}
134	greg	2.1	return 0;
135			}
136			if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) {
137	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
138			fputs(ncp->inpname, stderr);
139			fputs(": unexpected input format: ", stderr);
140			fputs(ncp->inpfmt, stderr);
141			fputc('\n', stderr);
142			}
143	greg	2.1	return 0;
144			}
145			return 1;
146			}
147
148
149			/* Decode next normal from input */
150			int
151			decode_normal_next(FVECT nrm, NORMCODEC *ncp)
152			{
153	greg	2.5	static int32 lastc;
154			static FVECT lastv;
155			int32 c = getint(4, ncp->finp);
156	greg	2.1
157			if (c == EOF && feof(ncp->finp))
158			return -1;
159
160	greg	2.4	if (c == lastc) { /* optimization */
161			VCOPY(nrm, lastv);
162			} else {
163			decodedir(nrm, c);
164			if (c) {
165			lastc = c;
166			VCOPY(lastv, nrm);
167			}
168			}
169	greg	2.1	return (c != 0);
170			}
171
172
173			/* Seek to the indicated pixel position */
174			int
175			seek_nc_pix(NORMCODEC *ncp, int x, int y)
176			{
177			if ((ncp->res.xr <= 0) \| (ncp->res.yr <= 0)) {
178	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
179			fputs(progname, stderr);
180			fputs(": need map resolution to seek\n", stderr);
181			}
182	greg	2.1	return -1;
183			}
184			if ((x < 0) \| (y < 0) \|\|
185			(x >= scanlen(&ncp->res)) \| (y >= numscans(&ncp->res))) {
186	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
187			fputs(ncp->inpname, stderr);
188			fputs(": warning - pixel index off map\n", stderr);
189			}
190	greg	2.1	return 0;
191			}
192	greg	2.7	if (fseek(ncp->finp, ncp->dstart + 4((long)yscanlen(&ncp->res) + x),
193			SEEK_SET) == EOF) {
194	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
195			fputs(ncp->inpname, stderr);
196			fputs(": seek error\n", stderr);
197			}
198	greg	2.1	return -1;
199			}
200			return 1;
201			}
202
203
204			/* Read and decode normal for the given pixel */
205			int
206			decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y)
207			{
208			int rval = seek_nc_pix(ncp, x, y);
209
210			if (rval < 0)
211			return -1;
212
213			if (!rval) {
214			nrm[0] = nrm[1] = nrm[2] = .0;
215			return 0;
216			}
217			return decode_normal_next(nrm, ncp);
218			}