| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
#include <string.h> |
| 6 |
#include <setjmp.h> |
| 7 |
|
| 8 |
#include <jpeglib.h> |
| 9 |
#include <gdk-pixbuf/gdk-pixbuf.h> |
| 10 |
|
| 11 |
#include <gperl.h> |
| 12 |
#include <gtk2perl.h> |
| 13 |
|
| 14 |
#define IW 80 /* MUST match Schnauer.pm! */ |
| 15 |
#define IH 60 /* MUST match Schnauer.pm! */ |
| 16 |
|
| 17 |
#define RAND (seed = (seed + 7141) * 54773 % 134456) |
| 18 |
|
| 19 |
#define LINELENGTH 240 |
| 20 |
|
| 21 |
#define ELLIPSIS "\xe2\x80\xa6" |
| 22 |
|
| 23 |
struct jpg_err_mgr |
| 24 |
{ |
| 25 |
struct jpeg_error_mgr err; |
| 26 |
jmp_buf setjmp_buffer; |
| 27 |
}; |
| 28 |
|
| 29 |
static void |
| 30 |
cv_error_exit (j_common_ptr cinfo) |
| 31 |
{ |
| 32 |
longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99); |
| 33 |
} |
| 34 |
|
| 35 |
static void |
| 36 |
cv_error_output (j_common_ptr cinfo) |
| 37 |
{ |
| 38 |
return; |
| 39 |
} |
| 40 |
|
| 41 |
static void |
| 42 |
rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b, |
| 43 |
unsigned int *h, unsigned int *s, unsigned int *v) |
| 44 |
{ |
| 45 |
unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b; |
| 46 |
unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b; |
| 47 |
unsigned int delta = mx - mn; |
| 48 |
|
| 49 |
*v = mx; |
| 50 |
|
| 51 |
*s = mx ? delta * 255 / mx : 0; |
| 52 |
|
| 53 |
if (delta == 0) |
| 54 |
*h = 0; |
| 55 |
else |
| 56 |
{ |
| 57 |
if (r == mx) |
| 58 |
*h = ((int)g - (int)b) * 255 / (int)(delta * 3); |
| 59 |
else if (g == mx) |
| 60 |
*h = ((int)b - (int)r) * 255 / (int)(delta * 3) + 52; |
| 61 |
else if (b == mx) |
| 62 |
*h = ((int)r - (int)g) * 255 / (int)(delta * 3) + 103; |
| 63 |
|
| 64 |
*h &= 255; |
| 65 |
} |
| 66 |
} |
| 67 |
|
| 68 |
static guint32 a85_val; |
| 69 |
static guint a85_cnt; |
| 70 |
static guchar a85_buf[LINELENGTH], *a85_ptr; |
| 71 |
|
| 72 |
static void |
| 73 |
a85_init (void) |
| 74 |
{ |
| 75 |
a85_cnt = 4; |
| 76 |
a85_ptr = a85_buf; |
| 77 |
} |
| 78 |
|
| 79 |
static void |
| 80 |
a85_push (PerlIO *fp, guchar c) |
| 81 |
{ |
| 82 |
a85_val = a85_val << 8 | c; |
| 83 |
|
| 84 |
if (!--a85_cnt) |
| 85 |
{ |
| 86 |
a85_cnt = 4; |
| 87 |
if (a85_val) |
| 88 |
{ |
| 89 |
a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85; |
| 90 |
a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85; |
| 91 |
a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85; |
| 92 |
a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85; |
| 93 |
a85_ptr[0] = (a85_val ) + 33; |
| 94 |
|
| 95 |
a85_ptr += 5; |
| 96 |
} |
| 97 |
else |
| 98 |
*a85_ptr++ = 'z'; |
| 99 |
|
| 100 |
if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7) |
| 101 |
{ |
| 102 |
*a85_ptr++ = '\n'; |
| 103 |
PerlIO_write (fp, a85_buf, a85_ptr - a85_buf); |
| 104 |
a85_ptr = a85_buf; |
| 105 |
} |
| 106 |
} |
| 107 |
|
| 108 |
} |
| 109 |
|
| 110 |
static void |
| 111 |
a85_finish (PerlIO *fp) |
| 112 |
{ |
| 113 |
while (a85_cnt != 4) |
| 114 |
a85_push (fp, 0); |
| 115 |
|
| 116 |
*a85_ptr++ = '~'; // probably buggy end-marker |
| 117 |
*a85_ptr++ = '>'; // probably buggy end-marker |
| 118 |
*a85_ptr++ = '\n'; |
| 119 |
|
| 120 |
PerlIO_write (fp, a85_buf, a85_ptr - a85_buf); |
| 121 |
} |
| 122 |
|
| 123 |
///////////////////////////////////////////////////////////////////////////// |
| 124 |
|
| 125 |
MODULE = Gtk2::CV PACKAGE = Gtk2::CV |
| 126 |
|
| 127 |
PROTOTYPES: ENABLE |
| 128 |
|
| 129 |
GdkPixbuf_noinc * |
| 130 |
transpose (GdkPixbuf *pb) |
| 131 |
CODE: |
| 132 |
{ |
| 133 |
int w = gdk_pixbuf_get_width (pb); |
| 134 |
int h = gdk_pixbuf_get_height (pb); |
| 135 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 136 |
int x, y, i; |
| 137 |
guchar *src = gdk_pixbuf_get_pixels (pb), *dst; |
| 138 |
int sstr = gdk_pixbuf_get_rowstride (pb), dstr; |
| 139 |
|
| 140 |
RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, h, w); |
| 141 |
|
| 142 |
dst = gdk_pixbuf_get_pixels (RETVAL); |
| 143 |
dstr = gdk_pixbuf_get_rowstride (RETVAL); |
| 144 |
|
| 145 |
for (y = 0; y < h; y++) |
| 146 |
for (x = 0; x < w; x++) |
| 147 |
for (i = 0; i < bpp; i++) |
| 148 |
dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i]; |
| 149 |
} |
| 150 |
OUTPUT: |
| 151 |
RETVAL |
| 152 |
|
| 153 |
GdkPixbuf_noinc * |
| 154 |
flop (GdkPixbuf *pb) |
| 155 |
CODE: |
| 156 |
{ |
| 157 |
int w = gdk_pixbuf_get_width (pb); |
| 158 |
int h = gdk_pixbuf_get_height (pb); |
| 159 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 160 |
int x, y, i; |
| 161 |
guchar *src = gdk_pixbuf_get_pixels (pb), *dst; |
| 162 |
int sstr = gdk_pixbuf_get_rowstride (pb), dstr; |
| 163 |
|
| 164 |
RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, w, h); |
| 165 |
|
| 166 |
dst = gdk_pixbuf_get_pixels (RETVAL); |
| 167 |
dstr = gdk_pixbuf_get_rowstride (RETVAL); |
| 168 |
|
| 169 |
for (y = 0; y < h; y++) |
| 170 |
for (x = 0; x < w; x++) |
| 171 |
for (i = 0; i < bpp; i++) |
| 172 |
dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i]; |
| 173 |
} |
| 174 |
OUTPUT: |
| 175 |
RETVAL |
| 176 |
|
| 177 |
GdkPixbuf_noinc * |
| 178 |
load_jpeg (char *path, int thumbnail=0) |
| 179 |
CODE: |
| 180 |
{ |
| 181 |
struct jpeg_decompress_struct cinfo; |
| 182 |
struct jpg_err_mgr jerr; |
| 183 |
guchar *data; |
| 184 |
int rs; |
| 185 |
FILE *fp; |
| 186 |
volatile GdkPixbuf *pb = 0; |
| 187 |
RETVAL = 0; |
| 188 |
|
| 189 |
if (!(fp = fopen (path, "rb"))) |
| 190 |
XSRETURN_UNDEF; |
| 191 |
|
| 192 |
cinfo.err = jpeg_std_error (&jerr.err); |
| 193 |
|
| 194 |
jerr.err.error_exit = cv_error_exit; |
| 195 |
jerr.err.output_message = cv_error_output; |
| 196 |
|
| 197 |
if ((rs = setjmp (jerr.setjmp_buffer))) |
| 198 |
{ |
| 199 |
fclose (fp); |
| 200 |
jpeg_destroy_decompress (&cinfo); |
| 201 |
|
| 202 |
if (pb) |
| 203 |
g_object_unref ((gpointer)pb); |
| 204 |
|
| 205 |
XSRETURN_UNDEF; |
| 206 |
} |
| 207 |
|
| 208 |
jpeg_create_decompress (&cinfo); |
| 209 |
|
| 210 |
jpeg_stdio_src (&cinfo, fp); |
| 211 |
jpeg_read_header (&cinfo, TRUE); |
| 212 |
|
| 213 |
cinfo.dct_method = JDCT_DEFAULT; |
| 214 |
cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */ |
| 215 |
cinfo.do_block_smoothing = FALSE; |
| 216 |
cinfo.out_color_space = JCS_RGB; |
| 217 |
cinfo.quantize_colors = FALSE; |
| 218 |
|
| 219 |
cinfo.scale_num = 1; |
| 220 |
cinfo.scale_denom = 1; |
| 221 |
|
| 222 |
jpeg_calc_output_dimensions (&cinfo); |
| 223 |
|
| 224 |
if (thumbnail) |
| 225 |
{ |
| 226 |
cinfo.dct_method = JDCT_FASTEST; |
| 227 |
cinfo.do_fancy_upsampling = FALSE; |
| 228 |
|
| 229 |
while (cinfo.scale_denom < 8 |
| 230 |
&& (cinfo.output_width >> 1) >= IW |
| 231 |
&& (cinfo.output_height >> 1) >= IH) |
| 232 |
{ |
| 233 |
cinfo.scale_denom <<= 1; |
| 234 |
jpeg_calc_output_dimensions (&cinfo); |
| 235 |
} |
| 236 |
} |
| 237 |
|
| 238 |
pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height); |
| 239 |
if (!RETVAL) |
| 240 |
longjmp (jerr.setjmp_buffer, 2); |
| 241 |
|
| 242 |
data = gdk_pixbuf_get_pixels (RETVAL); |
| 243 |
rs = gdk_pixbuf_get_rowstride (RETVAL); |
| 244 |
|
| 245 |
if (cinfo.output_components != 3) |
| 246 |
longjmp (jerr.setjmp_buffer, 3); |
| 247 |
|
| 248 |
jpeg_start_decompress (&cinfo); |
| 249 |
|
| 250 |
while (cinfo.output_scanline < cinfo.output_height) |
| 251 |
{ |
| 252 |
int remaining = cinfo.output_height - cinfo.output_scanline; |
| 253 |
JSAMPROW rp[4]; |
| 254 |
|
| 255 |
rp [0] = data + cinfo.output_scanline * rs; |
| 256 |
rp [1] = (guchar *)rp [0] + rs; |
| 257 |
rp [2] = (guchar *)rp [1] + rs; |
| 258 |
rp [3] = (guchar *)rp [2] + rs; |
| 259 |
|
| 260 |
jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4); |
| 261 |
} |
| 262 |
|
| 263 |
jpeg_finish_decompress (&cinfo); |
| 264 |
fclose (fp); |
| 265 |
jpeg_destroy_decompress (&cinfo); |
| 266 |
} |
| 267 |
OUTPUT: |
| 268 |
RETVAL |
| 269 |
|
| 270 |
############################################################################# |
| 271 |
|
| 272 |
MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer |
| 273 |
|
| 274 |
SV * |
| 275 |
foldcase (SV *pathsv) |
| 276 |
PROTOTYPE: $ |
| 277 |
CODE: |
| 278 |
{ |
| 279 |
STRLEN plen; |
| 280 |
U8 *path = SvPVutf8 (pathsv, plen); |
| 281 |
U8 *pend = path + plen; |
| 282 |
U8 dst [plen * 6 * 3], *dstp = dst; |
| 283 |
|
| 284 |
while (path < pend) |
| 285 |
{ |
| 286 |
U8 ch = *path; |
| 287 |
|
| 288 |
if (ch >= 'a' && ch <= 'z') |
| 289 |
*dstp++ = *path++; |
| 290 |
else if (ch >= '0' && ch <= '9') |
| 291 |
{ |
| 292 |
STRLEN el, nl = 0; |
| 293 |
while (*path >= '0' && *path <= '9' && path < pend) |
| 294 |
path++, nl++; |
| 295 |
|
| 296 |
for (el = nl; el < 6; el++) |
| 297 |
*dstp++ = '0'; |
| 298 |
|
| 299 |
memcpy (dstp, path - nl, nl); |
| 300 |
dstp += nl; |
| 301 |
} |
| 302 |
else |
| 303 |
{ |
| 304 |
STRLEN cl; |
| 305 |
to_utf8_fold (path, dstp, &cl); |
| 306 |
dstp += cl; |
| 307 |
path += is_utf8_char (path); |
| 308 |
} |
| 309 |
} |
| 310 |
|
| 311 |
RETVAL = newSVpvn (dst, dstp - dst); |
| 312 |
} |
| 313 |
OUTPUT: |
| 314 |
RETVAL |
| 315 |
|
| 316 |
GdkPixbuf_noinc * |
| 317 |
p7_to_pb (int w, int h, guchar *src) |
| 318 |
CODE: |
| 319 |
{ |
| 320 |
int x, y; |
| 321 |
guchar *dst, *d; |
| 322 |
int dstr; |
| 323 |
|
| 324 |
RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h); |
| 325 |
dst = gdk_pixbuf_get_pixels (RETVAL); |
| 326 |
dstr = gdk_pixbuf_get_rowstride (RETVAL); |
| 327 |
|
| 328 |
for (y = 0; y < h; y++) |
| 329 |
for (d = dst + y * dstr, x = 0; x < w; x++) |
| 330 |
{ |
| 331 |
*d++ = (((*src >> 5) & 7) * 255 + 4) / 7; |
| 332 |
*d++ = (((*src >> 2) & 7) * 255 + 4) / 7; |
| 333 |
*d++ = (((*src >> 0) & 3) * 255 + 2) / 3; |
| 334 |
|
| 335 |
src++; |
| 336 |
} |
| 337 |
} |
| 338 |
OUTPUT: |
| 339 |
RETVAL |
| 340 |
|
| 341 |
SV * |
| 342 |
pb_to_p7 (GdkPixbuf *pb) |
| 343 |
CODE: |
| 344 |
{ |
| 345 |
int w = gdk_pixbuf_get_width (pb); |
| 346 |
int h = gdk_pixbuf_get_height (pb); |
| 347 |
int x, y; |
| 348 |
guchar *dst; |
| 349 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 350 |
guchar *src = gdk_pixbuf_get_pixels (pb); |
| 351 |
int sstr = gdk_pixbuf_get_rowstride (pb); |
| 352 |
int Er[IW], Eg[IW], Eb[IW]; |
| 353 |
int seed = 77; |
| 354 |
|
| 355 |
RETVAL = newSV (w * h); |
| 356 |
SvPOK_only (RETVAL); |
| 357 |
SvCUR_set (RETVAL, w * h); |
| 358 |
|
| 359 |
dst = SvPVX (RETVAL); |
| 360 |
|
| 361 |
memset (Er, 0, sizeof (int) * IW); |
| 362 |
memset (Eg, 0, sizeof (int) * IW); |
| 363 |
memset (Eb, 0, sizeof (int) * IW); |
| 364 |
|
| 365 |
/* some primitive error distribution + random dithering */ |
| 366 |
|
| 367 |
for (y = 0; y < h; y++) |
| 368 |
{ |
| 369 |
int er = 0, eg = 0, eb = 0; |
| 370 |
|
| 371 |
for (x = 0; x < w; x++) |
| 372 |
{ |
| 373 |
int r, g, b; |
| 374 |
guchar *p = src + x * bpp + y * sstr; |
| 375 |
|
| 376 |
r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255; |
| 377 |
g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255; |
| 378 |
b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255; |
| 379 |
|
| 380 |
r = r > 7 ? 7 : r < 0 ? 0 : r; |
| 381 |
g = g > 7 ? 7 : g < 0 ? 0 : g; |
| 382 |
b = b > 3 ? 3 : b < 0 ? 0 : b; |
| 383 |
|
| 384 |
er += p[0] - (r * 255 + 4) / 7; |
| 385 |
eg += p[1] - (g * 255 + 4) / 7; |
| 386 |
eb += p[2] - (b * 255 + 2) / 3; |
| 387 |
|
| 388 |
Er[x] = er >> 1; er -= (er + 1) >> 1; |
| 389 |
Eg[x] = eg >> 1; eg -= (eg + 1) >> 1; |
| 390 |
Eb[x] = eb >> 1; eb -= (eb + 1) >> 1; |
| 391 |
|
| 392 |
*dst++ = r << 5 | g << 2 | b; |
| 393 |
} |
| 394 |
} |
| 395 |
} |
| 396 |
OUTPUT: |
| 397 |
RETVAL |
| 398 |
|
| 399 |
############################################################################# |
| 400 |
|
| 401 |
MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript |
| 402 |
|
| 403 |
void |
| 404 |
dump_ascii85 (PerlIO *fp, GdkPixbuf *pb) |
| 405 |
CODE: |
| 406 |
{ |
| 407 |
int w = gdk_pixbuf_get_width (pb); |
| 408 |
int h = gdk_pixbuf_get_height (pb); |
| 409 |
int x, y, i; |
| 410 |
guchar *dst; |
| 411 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 412 |
guchar *src = gdk_pixbuf_get_pixels (pb); |
| 413 |
int sstr = gdk_pixbuf_get_rowstride (pb); |
| 414 |
|
| 415 |
a85_init (); |
| 416 |
|
| 417 |
for (y = 0; y < h; y++) |
| 418 |
for (x = 0; x < w; x++) |
| 419 |
for (i = 0; i < (bpp < 3 ? 1 : 3); i++) |
| 420 |
a85_push (fp, src [x * bpp + y * sstr + i]); |
| 421 |
|
| 422 |
a85_finish (fp); |
| 423 |
} |
| 424 |
|
| 425 |
void |
| 426 |
dump_binary (PerlIO *fp, GdkPixbuf *pb) |
| 427 |
CODE: |
| 428 |
{ |
| 429 |
int w = gdk_pixbuf_get_width (pb); |
| 430 |
int h = gdk_pixbuf_get_height (pb); |
| 431 |
int x, y, i; |
| 432 |
guchar *dst; |
| 433 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 434 |
guchar *src = gdk_pixbuf_get_pixels (pb); |
| 435 |
int sstr = gdk_pixbuf_get_rowstride (pb); |
| 436 |
|
| 437 |
for (y = 0; y < h; y++) |
| 438 |
for (x = 0; x < w; x++) |
| 439 |
for (i = 0; i < (bpp < 3 ? 1 : 3); i++) |
| 440 |
PerlIO_putc (fp, src [x * bpp + y * sstr + i]); |
| 441 |
} |
| 442 |
|
| 443 |
############################################################################# |
| 444 |
|
| 445 |
MODULE = Gtk2::CV PACKAGE = Gtk2::CV |
| 446 |
|
| 447 |
SV * |
| 448 |
pb_to_hv84 (GdkPixbuf *pb) |
| 449 |
CODE: |
| 450 |
{ |
| 451 |
int w = gdk_pixbuf_get_width (pb); |
| 452 |
int h = gdk_pixbuf_get_height (pb); |
| 453 |
int x, y; |
| 454 |
guchar *dst; |
| 455 |
int bpp = gdk_pixbuf_get_n_channels (pb); |
| 456 |
guchar *src = gdk_pixbuf_get_pixels (pb); |
| 457 |
int sstr = gdk_pixbuf_get_rowstride (pb); |
| 458 |
|
| 459 |
RETVAL = newSV (6 * 8 * 12 / 8); |
| 460 |
SvPOK_only (RETVAL); |
| 461 |
SvCUR_set (RETVAL, 6 * 8 * 12 / 8); |
| 462 |
|
| 463 |
dst = SvPVX (RETVAL); |
| 464 |
|
| 465 |
/* some primitive error distribution + random dithering */ |
| 466 |
|
| 467 |
for (y = 0; y < h; y++) |
| 468 |
{ |
| 469 |
guchar *p = src + y * sstr; |
| 470 |
|
| 471 |
for (x = 0; x < w; x += 2) |
| 472 |
{ |
| 473 |
unsigned int r, g, b, h, s, v, H, V1, V2; |
| 474 |
|
| 475 |
if (bpp == 3) |
| 476 |
r = *p++, g = *p++, b = *p++; |
| 477 |
else if (bpp == 1) |
| 478 |
r = g = b = *p++; |
| 479 |
else |
| 480 |
abort (); |
| 481 |
|
| 482 |
rgb_to_hsv (r, g, b, &h, &s, &v); |
| 483 |
|
| 484 |
H = (h * 15 / 255) << 4; |
| 485 |
V1 = v; |
| 486 |
|
| 487 |
if (bpp == 3) |
| 488 |
r = *p++, g = *p++, b = *p++; |
| 489 |
else if (bpp == 1) |
| 490 |
r = g = b = *p++; |
| 491 |
else |
| 492 |
abort (); |
| 493 |
|
| 494 |
rgb_to_hsv (r, g, b, &h, &s, &v); |
| 495 |
|
| 496 |
H |= h * 15 / 255; |
| 497 |
V2 = v; |
| 498 |
|
| 499 |
*dst++ = H; |
| 500 |
*dst++ = V1; |
| 501 |
*dst++ = V2; |
| 502 |
} |
| 503 |
} |
| 504 |
} |
| 505 |
OUTPUT: |
| 506 |
RETVAL |
| 507 |
|
| 508 |
SV * |
| 509 |
hv84_to_av (unsigned char *hv84) |
| 510 |
CODE: |
| 511 |
{ |
| 512 |
int i = 72 / 3; |
| 513 |
AV *av = newAV (); |
| 514 |
|
| 515 |
RETVAL = (SV *)newRV_noinc ((SV *)av); |
| 516 |
while (i--) |
| 517 |
{ |
| 518 |
int h = *hv84++; |
| 519 |
int v1 = *hv84++; |
| 520 |
int v2 = *hv84++; |
| 521 |
|
| 522 |
av_push (av, newSViv (v1)); |
| 523 |
av_push (av, newSViv ((h >> 4) * 255 / 15)); |
| 524 |
av_push (av, newSViv (v2)); |
| 525 |
av_push (av, newSViv ((h & 15) * 255 / 15)); |
| 526 |
} |
| 527 |
} |
| 528 |
OUTPUT: |
| 529 |
RETVAL |
| 530 |
|
| 531 |
############################################################################# |
| 532 |
|
| 533 |
MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster |
| 534 |
|
| 535 |
SV * |
| 536 |
make_histograms (SV *ar) |
| 537 |
CODE: |
| 538 |
{ |
| 539 |
int i; |
| 540 |
AV *av, *result; |
| 541 |
|
| 542 |
if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV) |
| 543 |
croak ("Not an array ref as first argument to make_histogram"); |
| 544 |
|
| 545 |
av = (AV *) SvRV (ar); |
| 546 |
result = newAV (); |
| 547 |
|
| 548 |
for (i = 0; i <= av_len (av); ++i) |
| 549 |
{ |
| 550 |
const int HISTSIZE = 64; |
| 551 |
|
| 552 |
int j; |
| 553 |
SV *sv = *av_fetch (av, i, 1); |
| 554 |
STRLEN len; |
| 555 |
char *buf = SvPVbyte (sv, len); |
| 556 |
|
| 557 |
int tmphist[HISTSIZE]; |
| 558 |
float *hist; |
| 559 |
|
| 560 |
SV *histsv = newSV (HISTSIZE * sizeof (float) + 1); |
| 561 |
SvPOK_on (histsv); |
| 562 |
SvCUR_set (histsv, HISTSIZE * sizeof (float)); |
| 563 |
hist = (float *)SvPVX (histsv); |
| 564 |
|
| 565 |
Zero (tmphist, sizeof (tmphist), char); |
| 566 |
|
| 567 |
for (j = len; j--; ) |
| 568 |
{ |
| 569 |
unsigned int idx |
| 570 |
= ((*buf & 0xc0) >> 2) |
| 571 |
| ((*buf & 0x18) >> 1) |
| 572 |
| (*buf & 0x03); |
| 573 |
|
| 574 |
++tmphist[idx]; |
| 575 |
++buf; |
| 576 |
} |
| 577 |
|
| 578 |
for (j = 0; j < HISTSIZE; ++j) |
| 579 |
hist[j] = (float)tmphist[j] / (len + 1e-30); |
| 580 |
|
| 581 |
av_push (result, histsv); |
| 582 |
} |
| 583 |
|
| 584 |
RETVAL = newRV_noinc ((SV *)result); |
| 585 |
} |
| 586 |
OUTPUT: |
| 587 |
RETVAL |
| 588 |
|
| 589 |
|
