1 |
greg |
2.1 |
#ifndef lint |
2 |
greg |
2.4 |
static const char RCSid[] = "$Id: cmatrix.c,v 2.3 2014/04/08 23:45:33 greg Exp $"; |
3 |
greg |
2.1 |
#endif |
4 |
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/* |
5 |
|
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* Color matrix routines. |
6 |
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* |
7 |
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* G. Ward |
8 |
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*/ |
9 |
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10 |
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#include <ctype.h> |
11 |
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#include "standard.h" |
12 |
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#include "cmatrix.h" |
13 |
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#include "platform.h" |
14 |
greg |
2.2 |
#include "resolu.h" |
15 |
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16 |
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const char *cm_fmt_id[] = { |
17 |
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"unknown", "ascii", "float", "double", |
18 |
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COLRFMT, CIEFMT |
19 |
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}; |
20 |
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21 |
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const int cm_elem_size[] = { |
22 |
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0, 0, 3*sizeof(float), 3*sizeof(double), 4, 4 |
23 |
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}; |
24 |
greg |
2.1 |
|
25 |
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/* Allocate a color coefficient matrix */ |
26 |
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CMATRIX * |
27 |
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cm_alloc(int nrows, int ncols) |
28 |
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{ |
29 |
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CMATRIX *cm; |
30 |
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|
31 |
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if ((nrows <= 0) | (ncols <= 0)) |
32 |
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error(USER, "attempt to create empty matrix"); |
33 |
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cm = (CMATRIX *)malloc(sizeof(CMATRIX) + |
34 |
greg |
2.4 |
sizeof(COLOR)*(nrows*ncols - 1)); |
35 |
greg |
2.1 |
if (cm == NULL) |
36 |
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error(SYSTEM, "out of memory in cm_alloc()"); |
37 |
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cm->nrows = nrows; |
38 |
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cm->ncols = ncols; |
39 |
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return(cm); |
40 |
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} |
41 |
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|
42 |
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/* Resize color coefficient matrix */ |
43 |
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CMATRIX * |
44 |
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cm_resize(CMATRIX *cm, int nrows) |
45 |
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{ |
46 |
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if (nrows == cm->nrows) |
47 |
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return(cm); |
48 |
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if (nrows <= 0) { |
49 |
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cm_free(cm); |
50 |
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return(NULL); |
51 |
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} |
52 |
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cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) + |
53 |
greg |
2.4 |
sizeof(COLOR)*(nrows*cm->ncols - 1)); |
54 |
greg |
2.1 |
if (cm == NULL) |
55 |
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error(SYSTEM, "out of memory in cm_resize()"); |
56 |
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cm->nrows = nrows; |
57 |
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return(cm); |
58 |
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} |
59 |
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60 |
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static int |
61 |
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getDT(char *s, void *p) |
62 |
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{ |
63 |
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char fmt[32]; |
64 |
greg |
2.2 |
int i; |
65 |
greg |
2.1 |
|
66 |
greg |
2.2 |
if (!formatval(fmt, s)) |
67 |
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return(0); |
68 |
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for (i = 1; i < DTend; i++) |
69 |
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if (!strcmp(fmt, cm_fmt_id[i])) |
70 |
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*((int *)p) = i; |
71 |
greg |
2.1 |
return(0); |
72 |
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} |
73 |
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74 |
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/* Load header to obtain data type */ |
75 |
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int |
76 |
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getDTfromHeader(FILE *fp) |
77 |
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{ |
78 |
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int dt = DTfromHeader; |
79 |
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|
80 |
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if (getheader(fp, getDT, &dt) < 0) |
81 |
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error(SYSTEM, "header read error"); |
82 |
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if (dt == DTfromHeader) |
83 |
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error(USER, "missing data format in header"); |
84 |
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return(dt); |
85 |
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} |
86 |
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|
87 |
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/* Allocate and load a matrix from the given file (or stdin if NULL) */ |
88 |
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CMATRIX * |
89 |
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cm_load(const char *fname, int nrows, int ncols, int dtype) |
90 |
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{ |
91 |
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FILE *fp = stdin; |
92 |
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CMATRIX *cm; |
93 |
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|
94 |
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if (ncols <= 0) |
95 |
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error(USER, "Non-positive number of columns"); |
96 |
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if (fname == NULL) |
97 |
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fname = "<stdin>"; |
98 |
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else if ((fp = fopen(fname, "r")) == NULL) { |
99 |
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sprintf(errmsg, "cannot open file '%s'", fname); |
100 |
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error(SYSTEM, errmsg); |
101 |
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} |
102 |
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#ifdef getc_unlocked |
103 |
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flockfile(fp); |
104 |
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#endif |
105 |
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if (dtype != DTascii) |
106 |
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SET_FILE_BINARY(fp); /* doesn't really work */ |
107 |
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if (dtype == DTfromHeader) |
108 |
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dtype = getDTfromHeader(fp); |
109 |
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switch (dtype) { |
110 |
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case DTascii: |
111 |
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case DTfloat: |
112 |
|
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case DTdouble: |
113 |
|
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break; |
114 |
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default: |
115 |
|
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error(USER, "unexpected data type in cm_load()"); |
116 |
|
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} |
117 |
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if (nrows <= 0) { /* don't know length? */ |
118 |
|
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int guessrows = 147; /* usually big enough */ |
119 |
|
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if ((dtype != DTascii) & (fp != stdin)) { |
120 |
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long startpos = ftell(fp); |
121 |
|
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if (fseek(fp, 0L, SEEK_END) == 0) { |
122 |
|
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long endpos = ftell(fp); |
123 |
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long elemsiz = 3*(dtype==DTfloat ? |
124 |
|
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sizeof(float) : sizeof(double)); |
125 |
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|
126 |
|
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if ((endpos - startpos) % (ncols*elemsiz)) { |
127 |
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sprintf(errmsg, |
128 |
|
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"improper length for binary file '%s'", |
129 |
|
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fname); |
130 |
|
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error(USER, errmsg); |
131 |
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} |
132 |
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guessrows = (endpos - startpos)/(ncols*elemsiz); |
133 |
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if (fseek(fp, startpos, SEEK_SET) < 0) { |
134 |
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sprintf(errmsg, |
135 |
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"fseek() error on file '%s'", |
136 |
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fname); |
137 |
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error(SYSTEM, errmsg); |
138 |
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|
} |
139 |
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nrows = guessrows; /* we're confident */ |
140 |
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} |
141 |
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} |
142 |
|
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cm = cm_alloc(guessrows, ncols); |
143 |
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} else |
144 |
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cm = cm_alloc(nrows, ncols); |
145 |
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if (cm == NULL) /* XXX never happens */ |
146 |
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return(NULL); |
147 |
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if (dtype == DTascii) { /* read text file */ |
148 |
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int maxrow = (nrows > 0 ? nrows : 32000); |
149 |
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int r, c; |
150 |
|
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for (r = 0; r < maxrow; r++) { |
151 |
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if (r >= cm->nrows) /* need more space? */ |
152 |
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cm = cm_resize(cm, 2*cm->nrows); |
153 |
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for (c = 0; c < ncols; c++) { |
154 |
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COLORV *cv = cm_lval(cm,r,c); |
155 |
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if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) |
156 |
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if ((nrows <= 0) & (r > 0) & !c) { |
157 |
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cm = cm_resize(cm, maxrow=r); |
158 |
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break; |
159 |
|
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} else |
160 |
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goto EOFerror; |
161 |
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} |
162 |
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} |
163 |
|
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while ((c = getc(fp)) != EOF) |
164 |
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if (!isspace(c)) { |
165 |
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sprintf(errmsg, |
166 |
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"unexpected data at end of ascii file %s", |
167 |
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fname); |
168 |
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error(WARNING, errmsg); |
169 |
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break; |
170 |
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} |
171 |
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} else { /* read binary file */ |
172 |
greg |
2.2 |
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
173 |
greg |
2.1 |
int nread = 0; |
174 |
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do { /* read all we can */ |
175 |
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nread += fread(cm->cmem + 3*nread, |
176 |
greg |
2.4 |
sizeof(COLOR), |
177 |
greg |
2.1 |
cm->nrows*cm->ncols - nread, |
178 |
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fp); |
179 |
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if (nrows <= 0) { /* unknown length */ |
180 |
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if (nread == cm->nrows*cm->ncols) |
181 |
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/* need more space? */ |
182 |
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cm = cm_resize(cm, 2*cm->nrows); |
183 |
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else if (nread && !(nread % cm->ncols)) |
184 |
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/* seem to be done */ |
185 |
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cm = cm_resize(cm, nread/cm->ncols); |
186 |
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else /* ended mid-row */ |
187 |
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goto EOFerror; |
188 |
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} else if (nread < cm->nrows*cm->ncols) |
189 |
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goto EOFerror; |
190 |
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} while (nread < cm->nrows*cm->ncols); |
191 |
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192 |
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} else if (dtype == DTdouble) { |
193 |
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double dc[3]; /* load from double */ |
194 |
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COLORV *cvp = cm->cmem; |
195 |
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int n = nrows*ncols; |
196 |
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197 |
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if (n <= 0) |
198 |
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goto not_handled; |
199 |
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while (n--) { |
200 |
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if (fread(dc, sizeof(double), 3, fp) != 3) |
201 |
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goto EOFerror; |
202 |
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copycolor(cvp, dc); |
203 |
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cvp += 3; |
204 |
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} |
205 |
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} else /* dtype == DTfloat */ { |
206 |
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float fc[3]; /* load from float */ |
207 |
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COLORV *cvp = cm->cmem; |
208 |
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int n = nrows*ncols; |
209 |
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|
210 |
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if (n <= 0) |
211 |
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goto not_handled; |
212 |
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while (n--) { |
213 |
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if (fread(fc, sizeof(float), 3, fp) != 3) |
214 |
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goto EOFerror; |
215 |
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copycolor(cvp, fc); |
216 |
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cvp += 3; |
217 |
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} |
218 |
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} |
219 |
|
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if (fgetc(fp) != EOF) { |
220 |
|
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sprintf(errmsg, |
221 |
|
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"unexpected data at end of binary file %s", |
222 |
|
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fname); |
223 |
|
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error(WARNING, errmsg); |
224 |
|
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} |
225 |
|
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} |
226 |
|
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if (fp != stdin) |
227 |
|
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fclose(fp); |
228 |
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#ifdef getc_unlocked |
229 |
|
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else |
230 |
|
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funlockfile(fp); |
231 |
|
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#endif |
232 |
|
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return(cm); |
233 |
|
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EOFerror: |
234 |
|
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sprintf(errmsg, "unexpected EOF reading %s", fname); |
235 |
|
|
error(USER, errmsg); |
236 |
|
|
not_handled: |
237 |
|
|
error(INTERNAL, "unhandled data size or length in cm_load()"); |
238 |
|
|
return(NULL); /* gratis return */ |
239 |
|
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} |
240 |
|
|
|
241 |
|
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/* Extract a column vector from a matrix */ |
242 |
|
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CMATRIX * |
243 |
|
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cm_column(const CMATRIX *cm, int c) |
244 |
|
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{ |
245 |
|
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CMATRIX *cvr; |
246 |
|
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int dr; |
247 |
|
|
|
248 |
|
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if ((c < 0) | (c >= cm->ncols)) |
249 |
|
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error(INTERNAL, "column requested outside matrix"); |
250 |
|
|
cvr = cm_alloc(cm->nrows, 1); |
251 |
|
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if (cvr == NULL) |
252 |
|
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return(NULL); |
253 |
|
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for (dr = 0; dr < cm->nrows; dr++) { |
254 |
|
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const COLORV *sp = cm_lval(cm,dr,c); |
255 |
|
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COLORV *dp = cv_lval(cvr,dr); |
256 |
|
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dp[0] = sp[0]; |
257 |
|
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dp[1] = sp[1]; |
258 |
|
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dp[2] = sp[2]; |
259 |
|
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} |
260 |
|
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return(cvr); |
261 |
|
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} |
262 |
|
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|
263 |
|
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/* Scale a matrix by a single value */ |
264 |
|
|
CMATRIX * |
265 |
|
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cm_scale(const CMATRIX *cm1, const COLOR sca) |
266 |
|
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{ |
267 |
|
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CMATRIX *cmr; |
268 |
|
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int dr, dc; |
269 |
|
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|
270 |
|
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cmr = cm_alloc(cm1->nrows, cm1->ncols); |
271 |
|
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if (cmr == NULL) |
272 |
|
|
return(NULL); |
273 |
|
|
for (dr = 0; dr < cmr->nrows; dr++) |
274 |
|
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for (dc = 0; dc < cmr->ncols; dc++) { |
275 |
|
|
const COLORV *sp = cm_lval(cm1,dr,dc); |
276 |
|
|
COLORV *dp = cm_lval(cmr,dr,dc); |
277 |
|
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dp[0] = sp[0] * sca[0]; |
278 |
|
|
dp[1] = sp[1] * sca[1]; |
279 |
|
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dp[2] = sp[2] * sca[2]; |
280 |
|
|
} |
281 |
|
|
return(cmr); |
282 |
|
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} |
283 |
|
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|
284 |
|
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/* Multiply two matrices (or a matrix and a vector) and allocate the result */ |
285 |
|
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CMATRIX * |
286 |
|
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cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2) |
287 |
|
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{ |
288 |
|
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char *rowcheck=NULL, *colcheck=NULL; |
289 |
|
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CMATRIX *cmr; |
290 |
|
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int dr, dc, i; |
291 |
|
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|
292 |
|
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if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows)) |
293 |
|
|
error(INTERNAL, "matrix dimension mismatch in cm_multiply()"); |
294 |
|
|
cmr = cm_alloc(cm1->nrows, cm2->ncols); |
295 |
|
|
if (cmr == NULL) |
296 |
|
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return(NULL); |
297 |
|
|
/* optimization: check for zero rows & cols */ |
298 |
|
|
if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) { |
299 |
|
|
static const COLOR czero; |
300 |
|
|
rowcheck = (char *)calloc(cmr->nrows, 1); |
301 |
|
|
for (dr = cm1->nrows*(rowcheck != NULL); dr--; ) |
302 |
|
|
for (dc = cm1->ncols; dc--; ) |
303 |
|
|
if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) { |
304 |
|
|
rowcheck[dr] = 1; |
305 |
|
|
break; |
306 |
|
|
} |
307 |
|
|
colcheck = (char *)calloc(cmr->ncols, 1); |
308 |
|
|
for (dc = cm2->ncols*(colcheck != NULL); dc--; ) |
309 |
|
|
for (dr = cm2->nrows; dr--; ) |
310 |
|
|
if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) { |
311 |
|
|
colcheck[dc] = 1; |
312 |
|
|
break; |
313 |
|
|
} |
314 |
|
|
} |
315 |
|
|
for (dr = 0; dr < cmr->nrows; dr++) |
316 |
|
|
for (dc = 0; dc < cmr->ncols; dc++) { |
317 |
|
|
COLORV *dp = cm_lval(cmr,dr,dc); |
318 |
greg |
2.4 |
double res[3]; |
319 |
greg |
2.1 |
dp[0] = dp[1] = dp[2] = 0; |
320 |
|
|
if (rowcheck != NULL && !rowcheck[dr]) |
321 |
|
|
continue; |
322 |
|
|
if (colcheck != NULL && !colcheck[dc]) |
323 |
|
|
continue; |
324 |
greg |
2.4 |
res[0] = res[1] = res[2] = 0; |
325 |
greg |
2.1 |
for (i = 0; i < cm1->ncols; i++) { |
326 |
|
|
const COLORV *cp1 = cm_lval(cm1,dr,i); |
327 |
|
|
const COLORV *cp2 = cm_lval(cm2,i,dc); |
328 |
greg |
2.4 |
res[0] += cp1[0] * cp2[0]; |
329 |
|
|
res[1] += cp1[1] * cp2[1]; |
330 |
|
|
res[2] += cp1[2] * cp2[2]; |
331 |
greg |
2.1 |
} |
332 |
greg |
2.4 |
copycolor(dp, res); |
333 |
greg |
2.1 |
} |
334 |
|
|
if (rowcheck != NULL) free(rowcheck); |
335 |
|
|
if (colcheck != NULL) free(colcheck); |
336 |
|
|
return(cmr); |
337 |
|
|
} |
338 |
|
|
|
339 |
greg |
2.2 |
/* write out matrix to file (precede by resolution string if picture) */ |
340 |
|
|
int |
341 |
|
|
cm_write(const CMATRIX *cm, int dtype, FILE *fp) |
342 |
greg |
2.1 |
{ |
343 |
greg |
2.3 |
static const char tabEOL[2] = {'\t','\n'}; |
344 |
|
|
const COLORV *mp = cm->cmem; |
345 |
|
|
int r, c; |
346 |
greg |
2.2 |
|
347 |
|
|
switch (dtype) { |
348 |
|
|
case DTascii: |
349 |
greg |
2.3 |
for (r = 0; r < cm->nrows; r++) |
350 |
greg |
2.2 |
for (c = 0; c < cm->ncols; c++, mp += 3) |
351 |
greg |
2.3 |
fprintf(fp, "%.6e %.6e %.6e%c", |
352 |
|
|
mp[0], mp[1], mp[2], |
353 |
|
|
tabEOL[c >= cm->ncols-1]); |
354 |
greg |
2.2 |
break; |
355 |
|
|
case DTfloat: |
356 |
|
|
case DTdouble: |
357 |
|
|
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
358 |
|
|
r = cm->ncols*cm->nrows; |
359 |
|
|
while (r > 0) { |
360 |
|
|
c = fwrite(mp, sizeof(COLOR), r, fp); |
361 |
|
|
if (c <= 0) |
362 |
|
|
return(0); |
363 |
|
|
mp += 3*c; |
364 |
|
|
r -= c; |
365 |
|
|
} |
366 |
|
|
} else if (dtype == DTdouble) { |
367 |
|
|
double dc[3]; |
368 |
|
|
r = cm->ncols*cm->nrows; |
369 |
|
|
while (r--) { |
370 |
|
|
copycolor(dc, mp); |
371 |
|
|
if (fwrite(dc, sizeof(double), 3, fp) != 3) |
372 |
|
|
return(0); |
373 |
|
|
mp += 3; |
374 |
|
|
} |
375 |
|
|
} else /* dtype == DTfloat */ { |
376 |
|
|
float fc[3]; |
377 |
|
|
r = cm->ncols*cm->nrows; |
378 |
|
|
while (r--) { |
379 |
|
|
copycolor(fc, mp); |
380 |
|
|
if (fwrite(fc, sizeof(float), 3, fp) != 3) |
381 |
|
|
return(0); |
382 |
|
|
mp += 3; |
383 |
|
|
} |
384 |
|
|
} |
385 |
|
|
break; |
386 |
|
|
case DTrgbe: |
387 |
|
|
case DTxyze: |
388 |
|
|
fprtresolu(cm->ncols, cm->nrows, fp); |
389 |
|
|
for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols) |
390 |
|
|
if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0) |
391 |
|
|
return(0); |
392 |
|
|
break; |
393 |
|
|
default: |
394 |
|
|
fputs("Unsupported data type in cm_write()!\n", stderr); |
395 |
|
|
return(0); |
396 |
greg |
2.1 |
} |
397 |
greg |
2.2 |
return(fflush(fp) == 0); |
398 |
greg |
2.1 |
} |