src/common/normcodec.c

#ifndef lint
static const char RCSid[] = "$Id: normcodec.c,v 2.4 2019/08/26 23:33:24 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 (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':
                                fputendian(stdout);
                                fputformat("float", stdout);
                                break;
                        case 'd':
                                fputendian(stdout);
                                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)
{
        static int32    lastc;
        static FVECT    lastv;
        int32           c = getint(4, ncp->finp);

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

        ncp->curpos += 4;

        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)
{
        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:	2.5
Committed:	Thu Nov 7 23:20:28 2019 UTC (4 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 2.4:	+4 -5 lines
Log Message:	Added ability for pinterp, pmblur2, and vwrays to read 16-bit encoded depth
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.5	static const char RCSid[] = "$Id: normcodec.c,v 2.4 2019/08/26 23:33:24 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	2.1	if (ncp->hdrflags & HF_HEADOUT)
43			fputs(s, stdout); /* copy to standard output */
44			return 1;
45			}
46
47
48			/* Load/copy header */
49			int
50			process_nc_header(NORMCODEC ncp, int ac, char av[])
51			{
52			if (ncp->hdrflags & HF_HEADIN &&
53			getheader(ncp->finp, headline, ncp) < 0) {
54	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
55			fputs(ncp->inpname, stderr);
56			fputs(": bad header\n", stderr);
57			}
58			return 0;
59	greg	2.1	}
60			if (ncp->hdrflags & HF_HEADOUT) { /* finish header */
61			if (!(ncp->hdrflags & HF_HEADIN))
62			newheader("RADIANCE", stdout);
63			if (ac > 0)
64			printargs(ac, av, stdout);
65			if (ncp->hdrflags & HF_ENCODE) {
66			fputformat(NORMAL32FMT, stdout);
67			} else
68			switch (ncp->format) {
69			case 'a':
70			fputformat("ascii", stdout);
71			break;
72			case 'f':
73	greg	2.3	fputendian(stdout);
74	greg	2.1	fputformat("float", stdout);
75			break;
76			case 'd':
77	greg	2.3	fputendian(stdout);
78	greg	2.1	fputformat("double", stdout);
79			break;
80			}
81			fputc('\n', stdout);
82			}
83			/* get/put resolution string */
84			if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) {
85	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
86			fputs(ncp->inpname, stderr);
87			fputs(": bad resolution string\n", stderr);
88			}
89			return 0;
90	greg	2.1	}
91			if (ncp->hdrflags & HF_RESOUT)
92			fputsresolu(&ncp->res, stdout);
93
94			ncp->dstart = ncp->curpos = ftell(ncp->finp);
95			return 1;
96			}
97
98
99			/* Check that we have what we need to decode normals */
100			int
101			check_decode_normals(NORMCODEC *ncp)
102			{
103			if (ncp->hdrflags & HF_ENCODE) {
104	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
105			fputs(progname, stderr);
106			fputs(": wrong header mode for decode\n", stderr);
107			}
108	greg	2.1	return 0;
109			}
110			if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) {
111	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
112			fputs(ncp->inpname, stderr);
113			fputs(": unexpected input format: ", stderr);
114			fputs(ncp->inpfmt, stderr);
115			fputc('\n', stderr);
116			}
117	greg	2.1	return 0;
118			}
119			return 1;
120			}
121
122
123			/* Decode next normal from input */
124			int
125			decode_normal_next(FVECT nrm, NORMCODEC *ncp)
126			{
127	greg	2.5	static int32 lastc;
128			static FVECT lastv;
129			int32 c = getint(4, ncp->finp);
130	greg	2.1
131			if (c == EOF && feof(ncp->finp))
132			return -1;
133
134			ncp->curpos += 4;
135
136	greg	2.4	if (c == lastc) { /* optimization */
137			VCOPY(nrm, lastv);
138			} else {
139			decodedir(nrm, c);
140			if (c) {
141			lastc = c;
142			VCOPY(lastv, nrm);
143			}
144			}
145	greg	2.1	return (c != 0);
146			}
147
148
149			/* Seek to the indicated pixel position */
150			int
151			seek_nc_pix(NORMCODEC *ncp, int x, int y)
152			{
153			long seekpos;
154
155			if ((ncp->res.xr <= 0) \| (ncp->res.yr <= 0)) {
156	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
157			fputs(progname, stderr);
158			fputs(": need map resolution to seek\n", stderr);
159			}
160	greg	2.1	return -1;
161			}
162			if ((x < 0) \| (y < 0) \|\|
163			(x >= scanlen(&ncp->res)) \| (y >= numscans(&ncp->res))) {
164	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
165			fputs(ncp->inpname, stderr);
166			fputs(": warning - pixel index off map\n", stderr);
167			}
168	greg	2.1	return 0;
169			}
170			seekpos = ncp->dstart + 4((long)yscanlen(&ncp->res) + x);
171
172			if (seekpos != ncp->curpos &&
173			fseek(ncp->finp, seekpos, SEEK_SET) == EOF) {
174	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
175			fputs(ncp->inpname, stderr);
176			fputs(": seek error\n", stderr);
177			}
178	greg	2.1	return -1;
179			}
180			ncp->curpos = seekpos;
181			return 1;
182			}
183
184
185			/* Read and decode normal for the given pixel */
186			int
187			decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y)
188			{
189			int rval = seek_nc_pix(ncp, x, y);
190
191			if (rval < 0)
192			return -1;
193
194			if (!rval) {
195			nrm[0] = nrm[1] = nrm[2] = .0;
196			return 0;
197			}
198			return decode_normal_next(nrm, ncp);
199			}