src/common/normcodec.c

#ifndef lint
static const char RCSid[] = "$Id: normcodec.c,v 2.6 2022/03/03 16:09:31 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;
        }
                                        /* get 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_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:	2.7
Committed:	Wed Aug 24 19:55:58 2022 UTC (2 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.6:	+4 -11 lines
Log Message:	perf: Eliminated unnecessary curpos optimization to simplify code
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.7	static const char RCSid[] = "$Id: normcodec.c,v 2.6 2022/03/03 16:09:31 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	greg	2.6	/* get resolution string? */
61			if (ncp->hdrflags & HF_RESIN && !fgetsresolu(&ncp->res, ncp->finp)) {
62			if (ncp->hdrflags & HF_STDERR) {
63			fputs(ncp->inpname, stderr);
64			fputs(": bad resolution string\n", stderr);
65			}
66			return 0;
67			}
68	greg	2.1	if (ncp->hdrflags & HF_HEADOUT) { /* finish header */
69			if (!(ncp->hdrflags & HF_HEADIN))
70			newheader("RADIANCE", stdout);
71			if (ac > 0)
72			printargs(ac, av, stdout);
73			if (ncp->hdrflags & HF_ENCODE) {
74			fputformat(NORMAL32FMT, stdout);
75	greg	2.6	} else {
76			fputs("NCOMP=3\n", stdout);
77			if ((ncp->hdrflags & (HF_RESIN\|HF_RESOUT)) == HF_RESIN)
78			printf("NCOLS=%d\nNROWS=%d\n",
79			scanlen(&ncp->res),
80			numscans(&ncp->res));
81	greg	2.1	switch (ncp->format) {
82			case 'a':
83			fputformat("ascii", stdout);
84			break;
85			case 'f':
86	greg	2.3	fputendian(stdout);
87	greg	2.1	fputformat("float", stdout);
88			break;
89			case 'd':
90	greg	2.3	fputendian(stdout);
91	greg	2.1	fputformat("double", stdout);
92			break;
93			}
94	greg	2.6	}
95	greg	2.1	fputc('\n', stdout);
96			}
97	greg	2.6	if (ncp->hdrflags & HF_RESOUT) /* put resolution string? */
98	greg	2.1	fputsresolu(&ncp->res, stdout);
99
100	greg	2.7	ncp->dstart = ftell(ncp->finp);
101	greg	2.1	return 1;
102			}
103
104
105			/* Check that we have what we need to decode normals */
106			int
107			check_decode_normals(NORMCODEC *ncp)
108			{
109			if (ncp->hdrflags & HF_ENCODE) {
110	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
111			fputs(progname, stderr);
112			fputs(": wrong header mode for decode\n", stderr);
113			}
114	greg	2.1	return 0;
115			}
116			if (ncp->inpfmt[0] && strcmp(ncp->inpfmt, NORMAL32FMT)) {
117	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
118			fputs(ncp->inpname, stderr);
119			fputs(": unexpected input format: ", stderr);
120			fputs(ncp->inpfmt, stderr);
121			fputc('\n', stderr);
122			}
123	greg	2.1	return 0;
124			}
125			return 1;
126			}
127
128
129			/* Decode next normal from input */
130			int
131			decode_normal_next(FVECT nrm, NORMCODEC *ncp)
132			{
133	greg	2.5	static int32 lastc;
134			static FVECT lastv;
135			int32 c = getint(4, ncp->finp);
136	greg	2.1
137			if (c == EOF && feof(ncp->finp))
138			return -1;
139
140	greg	2.4	if (c == lastc) { /* optimization */
141			VCOPY(nrm, lastv);
142			} else {
143			decodedir(nrm, c);
144			if (c) {
145			lastc = c;
146			VCOPY(lastv, nrm);
147			}
148			}
149	greg	2.1	return (c != 0);
150			}
151
152
153			/* Seek to the indicated pixel position */
154			int
155			seek_nc_pix(NORMCODEC *ncp, int x, int y)
156			{
157			if ((ncp->res.xr <= 0) \| (ncp->res.yr <= 0)) {
158	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
159			fputs(progname, stderr);
160			fputs(": need map resolution to seek\n", stderr);
161			}
162	greg	2.1	return -1;
163			}
164			if ((x < 0) \| (y < 0) \|\|
165			(x >= scanlen(&ncp->res)) \| (y >= numscans(&ncp->res))) {
166	greg	2.2	if (ncp->hdrflags & HF_STDERR) {
167			fputs(ncp->inpname, stderr);
168			fputs(": warning - pixel index off map\n", stderr);
169			}
170	greg	2.1	return 0;
171			}
172	greg	2.7	if (fseek(ncp->finp, ncp->dstart + 4((long)yscanlen(&ncp->res) + x),
173			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			return 1;
181			}
182
183
184			/* Read and decode normal for the given pixel */
185			int
186			decode_normal_pix(FVECT nrm, NORMCODEC *ncp, int x, int y)
187			{
188			int rval = seek_nc_pix(ncp, x, y);
189
190			if (rval < 0)
191			return -1;
192
193			if (!rval) {
194			nrm[0] = nrm[1] = nrm[2] = .0;
195			return 0;
196			}
197			return decode_normal_next(nrm, ncp);
198			}