1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: cmatrix.c,v 2.1 2014/01/20 21:29:04 greg Exp $"; |
3 |
#endif |
4 |
/* |
5 |
* Color matrix routines. |
6 |
* |
7 |
* G. Ward |
8 |
*/ |
9 |
|
10 |
#include <ctype.h> |
11 |
#include "standard.h" |
12 |
#include "cmatrix.h" |
13 |
#include "platform.h" |
14 |
#include "resolu.h" |
15 |
|
16 |
const char *cm_fmt_id[] = { |
17 |
"unknown", "ascii", "float", "double", |
18 |
COLRFMT, CIEFMT |
19 |
}; |
20 |
|
21 |
const int cm_elem_size[] = { |
22 |
0, 0, 3*sizeof(float), 3*sizeof(double), 4, 4 |
23 |
}; |
24 |
|
25 |
/* Allocate a color coefficient matrix */ |
26 |
CMATRIX * |
27 |
cm_alloc(int nrows, int ncols) |
28 |
{ |
29 |
CMATRIX *cm; |
30 |
|
31 |
if ((nrows <= 0) | (ncols <= 0)) |
32 |
error(USER, "attempt to create empty matrix"); |
33 |
cm = (CMATRIX *)malloc(sizeof(CMATRIX) + |
34 |
3*sizeof(COLORV)*(nrows*ncols - 1)); |
35 |
if (cm == NULL) |
36 |
error(SYSTEM, "out of memory in cm_alloc()"); |
37 |
cm->nrows = nrows; |
38 |
cm->ncols = ncols; |
39 |
return(cm); |
40 |
} |
41 |
|
42 |
/* Resize color coefficient matrix */ |
43 |
CMATRIX * |
44 |
cm_resize(CMATRIX *cm, int nrows) |
45 |
{ |
46 |
if (nrows == cm->nrows) |
47 |
return(cm); |
48 |
if (nrows <= 0) { |
49 |
cm_free(cm); |
50 |
return(NULL); |
51 |
} |
52 |
cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) + |
53 |
3*sizeof(COLORV)*(nrows*cm->ncols - 1)); |
54 |
if (cm == NULL) |
55 |
error(SYSTEM, "out of memory in cm_resize()"); |
56 |
cm->nrows = nrows; |
57 |
return(cm); |
58 |
} |
59 |
|
60 |
static int |
61 |
getDT(char *s, void *p) |
62 |
{ |
63 |
char fmt[32]; |
64 |
int i; |
65 |
|
66 |
if (!formatval(fmt, s)) |
67 |
return(0); |
68 |
for (i = 1; i < DTend; i++) |
69 |
if (!strcmp(fmt, cm_fmt_id[i])) |
70 |
*((int *)p) = i; |
71 |
return(0); |
72 |
} |
73 |
|
74 |
/* Load header to obtain data type */ |
75 |
int |
76 |
getDTfromHeader(FILE *fp) |
77 |
{ |
78 |
int dt = DTfromHeader; |
79 |
|
80 |
if (getheader(fp, getDT, &dt) < 0) |
81 |
error(SYSTEM, "header read error"); |
82 |
if (dt == DTfromHeader) |
83 |
error(USER, "missing data format in header"); |
84 |
return(dt); |
85 |
} |
86 |
|
87 |
/* Allocate and load a matrix from the given file (or stdin if NULL) */ |
88 |
CMATRIX * |
89 |
cm_load(const char *fname, int nrows, int ncols, int dtype) |
90 |
{ |
91 |
FILE *fp = stdin; |
92 |
CMATRIX *cm; |
93 |
|
94 |
if (ncols <= 0) |
95 |
error(USER, "Non-positive number of columns"); |
96 |
if (fname == NULL) |
97 |
fname = "<stdin>"; |
98 |
else if ((fp = fopen(fname, "r")) == NULL) { |
99 |
sprintf(errmsg, "cannot open file '%s'", fname); |
100 |
error(SYSTEM, errmsg); |
101 |
} |
102 |
#ifdef getc_unlocked |
103 |
flockfile(fp); |
104 |
#endif |
105 |
if (dtype != DTascii) |
106 |
SET_FILE_BINARY(fp); /* doesn't really work */ |
107 |
if (dtype == DTfromHeader) |
108 |
dtype = getDTfromHeader(fp); |
109 |
switch (dtype) { |
110 |
case DTascii: |
111 |
case DTfloat: |
112 |
case DTdouble: |
113 |
break; |
114 |
default: |
115 |
error(USER, "unexpected data type in cm_load()"); |
116 |
} |
117 |
if (nrows <= 0) { /* don't know length? */ |
118 |
int guessrows = 147; /* usually big enough */ |
119 |
if ((dtype != DTascii) & (fp != stdin)) { |
120 |
long startpos = ftell(fp); |
121 |
if (fseek(fp, 0L, SEEK_END) == 0) { |
122 |
long endpos = ftell(fp); |
123 |
long elemsiz = 3*(dtype==DTfloat ? |
124 |
sizeof(float) : sizeof(double)); |
125 |
|
126 |
if ((endpos - startpos) % (ncols*elemsiz)) { |
127 |
sprintf(errmsg, |
128 |
"improper length for binary file '%s'", |
129 |
fname); |
130 |
error(USER, errmsg); |
131 |
} |
132 |
guessrows = (endpos - startpos)/(ncols*elemsiz); |
133 |
if (fseek(fp, startpos, SEEK_SET) < 0) { |
134 |
sprintf(errmsg, |
135 |
"fseek() error on file '%s'", |
136 |
fname); |
137 |
error(SYSTEM, errmsg); |
138 |
} |
139 |
nrows = guessrows; /* we're confident */ |
140 |
} |
141 |
} |
142 |
cm = cm_alloc(guessrows, ncols); |
143 |
} else |
144 |
cm = cm_alloc(nrows, ncols); |
145 |
if (cm == NULL) /* XXX never happens */ |
146 |
return(NULL); |
147 |
if (dtype == DTascii) { /* read text file */ |
148 |
int maxrow = (nrows > 0 ? nrows : 32000); |
149 |
int r, c; |
150 |
for (r = 0; r < maxrow; r++) { |
151 |
if (r >= cm->nrows) /* need more space? */ |
152 |
cm = cm_resize(cm, 2*cm->nrows); |
153 |
for (c = 0; c < ncols; c++) { |
154 |
COLORV *cv = cm_lval(cm,r,c); |
155 |
if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) |
156 |
if ((nrows <= 0) & (r > 0) & !c) { |
157 |
cm = cm_resize(cm, maxrow=r); |
158 |
break; |
159 |
} else |
160 |
goto EOFerror; |
161 |
} |
162 |
} |
163 |
while ((c = getc(fp)) != EOF) |
164 |
if (!isspace(c)) { |
165 |
sprintf(errmsg, |
166 |
"unexpected data at end of ascii file %s", |
167 |
fname); |
168 |
error(WARNING, errmsg); |
169 |
break; |
170 |
} |
171 |
} else { /* read binary file */ |
172 |
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
173 |
int nread = 0; |
174 |
do { /* read all we can */ |
175 |
nread += fread(cm->cmem + 3*nread, |
176 |
3*sizeof(COLORV), |
177 |
cm->nrows*cm->ncols - nread, |
178 |
fp); |
179 |
if (nrows <= 0) { /* unknown length */ |
180 |
if (nread == cm->nrows*cm->ncols) |
181 |
/* need more space? */ |
182 |
cm = cm_resize(cm, 2*cm->nrows); |
183 |
else if (nread && !(nread % cm->ncols)) |
184 |
/* seem to be done */ |
185 |
cm = cm_resize(cm, nread/cm->ncols); |
186 |
else /* ended mid-row */ |
187 |
goto EOFerror; |
188 |
} else if (nread < cm->nrows*cm->ncols) |
189 |
goto EOFerror; |
190 |
} while (nread < cm->nrows*cm->ncols); |
191 |
|
192 |
} else if (dtype == DTdouble) { |
193 |
double dc[3]; /* load from double */ |
194 |
COLORV *cvp = cm->cmem; |
195 |
int n = nrows*ncols; |
196 |
|
197 |
if (n <= 0) |
198 |
goto not_handled; |
199 |
while (n--) { |
200 |
if (fread(dc, sizeof(double), 3, fp) != 3) |
201 |
goto EOFerror; |
202 |
copycolor(cvp, dc); |
203 |
cvp += 3; |
204 |
} |
205 |
} else /* dtype == DTfloat */ { |
206 |
float fc[3]; /* load from float */ |
207 |
COLORV *cvp = cm->cmem; |
208 |
int n = nrows*ncols; |
209 |
|
210 |
if (n <= 0) |
211 |
goto not_handled; |
212 |
while (n--) { |
213 |
if (fread(fc, sizeof(float), 3, fp) != 3) |
214 |
goto EOFerror; |
215 |
copycolor(cvp, fc); |
216 |
cvp += 3; |
217 |
} |
218 |
} |
219 |
if (fgetc(fp) != EOF) { |
220 |
sprintf(errmsg, |
221 |
"unexpected data at end of binary file %s", |
222 |
fname); |
223 |
error(WARNING, errmsg); |
224 |
} |
225 |
} |
226 |
if (fp != stdin) |
227 |
fclose(fp); |
228 |
#ifdef getc_unlocked |
229 |
else |
230 |
funlockfile(fp); |
231 |
#endif |
232 |
return(cm); |
233 |
EOFerror: |
234 |
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 |
} |
240 |
|
241 |
/* Extract a column vector from a matrix */ |
242 |
CMATRIX * |
243 |
cm_column(const CMATRIX *cm, int c) |
244 |
{ |
245 |
CMATRIX *cvr; |
246 |
int dr; |
247 |
|
248 |
if ((c < 0) | (c >= cm->ncols)) |
249 |
error(INTERNAL, "column requested outside matrix"); |
250 |
cvr = cm_alloc(cm->nrows, 1); |
251 |
if (cvr == NULL) |
252 |
return(NULL); |
253 |
for (dr = 0; dr < cm->nrows; dr++) { |
254 |
const COLORV *sp = cm_lval(cm,dr,c); |
255 |
COLORV *dp = cv_lval(cvr,dr); |
256 |
dp[0] = sp[0]; |
257 |
dp[1] = sp[1]; |
258 |
dp[2] = sp[2]; |
259 |
} |
260 |
return(cvr); |
261 |
} |
262 |
|
263 |
/* Scale a matrix by a single value */ |
264 |
CMATRIX * |
265 |
cm_scale(const CMATRIX *cm1, const COLOR sca) |
266 |
{ |
267 |
CMATRIX *cmr; |
268 |
int dr, dc; |
269 |
|
270 |
cmr = cm_alloc(cm1->nrows, cm1->ncols); |
271 |
if (cmr == NULL) |
272 |
return(NULL); |
273 |
for (dr = 0; dr < cmr->nrows; dr++) |
274 |
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 |
dp[0] = sp[0] * sca[0]; |
278 |
dp[1] = sp[1] * sca[1]; |
279 |
dp[2] = sp[2] * sca[2]; |
280 |
} |
281 |
return(cmr); |
282 |
} |
283 |
|
284 |
/* Multiply two matrices (or a matrix and a vector) and allocate the result */ |
285 |
CMATRIX * |
286 |
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2) |
287 |
{ |
288 |
char *rowcheck=NULL, *colcheck=NULL; |
289 |
CMATRIX *cmr; |
290 |
int dr, dc, i; |
291 |
|
292 |
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 |
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 |
dp[0] = dp[1] = dp[2] = 0; |
319 |
if (rowcheck != NULL && !rowcheck[dr]) |
320 |
continue; |
321 |
if (colcheck != NULL && !colcheck[dc]) |
322 |
continue; |
323 |
for (i = 0; i < cm1->ncols; i++) { |
324 |
const COLORV *cp1 = cm_lval(cm1,dr,i); |
325 |
const COLORV *cp2 = cm_lval(cm2,i,dc); |
326 |
dp[0] += cp1[0] * cp2[0]; |
327 |
dp[1] += cp1[1] * cp2[1]; |
328 |
dp[2] += cp1[2] * cp2[2]; |
329 |
} |
330 |
} |
331 |
if (rowcheck != NULL) free(rowcheck); |
332 |
if (colcheck != NULL) free(colcheck); |
333 |
return(cmr); |
334 |
} |
335 |
|
336 |
/* write out matrix to file (precede by resolution string if picture) */ |
337 |
int |
338 |
cm_write(const CMATRIX *cm, int dtype, FILE *fp) |
339 |
{ |
340 |
const COLORV *mp = cm->cmem; |
341 |
int r, c; |
342 |
|
343 |
switch (dtype) { |
344 |
case DTascii: |
345 |
for (r = 0; r < cm->nrows; r++) { |
346 |
for (c = 0; c < cm->ncols; c++, mp += 3) |
347 |
fprintf(fp, "\t%.6e %.6e %.6e", |
348 |
mp[0], mp[1], mp[2]); |
349 |
fputc('\n', fp); |
350 |
} |
351 |
break; |
352 |
case DTfloat: |
353 |
case DTdouble: |
354 |
if (sizeof(COLOR) == cm_elem_size[dtype]) { |
355 |
r = cm->ncols*cm->nrows; |
356 |
while (r > 0) { |
357 |
c = fwrite(mp, sizeof(COLOR), r, fp); |
358 |
if (c <= 0) |
359 |
return(0); |
360 |
mp += 3*c; |
361 |
r -= c; |
362 |
} |
363 |
} else if (dtype == DTdouble) { |
364 |
double dc[3]; |
365 |
r = cm->ncols*cm->nrows; |
366 |
while (r--) { |
367 |
copycolor(dc, mp); |
368 |
if (fwrite(dc, sizeof(double), 3, fp) != 3) |
369 |
return(0); |
370 |
mp += 3; |
371 |
} |
372 |
} else /* dtype == DTfloat */ { |
373 |
float fc[3]; |
374 |
r = cm->ncols*cm->nrows; |
375 |
while (r--) { |
376 |
copycolor(fc, mp); |
377 |
if (fwrite(fc, sizeof(float), 3, fp) != 3) |
378 |
return(0); |
379 |
mp += 3; |
380 |
} |
381 |
} |
382 |
break; |
383 |
case DTrgbe: |
384 |
case DTxyze: |
385 |
fprtresolu(cm->ncols, cm->nrows, fp); |
386 |
for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols) |
387 |
if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0) |
388 |
return(0); |
389 |
break; |
390 |
default: |
391 |
fputs("Unsupported data type in cm_write()!\n", stderr); |
392 |
return(0); |
393 |
} |
394 |
return(fflush(fp) == 0); |
395 |
} |