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Comparing CV/CV.xs (file contents):
Revision 1.36 by root, Thu Jun 22 20:50:05 2006 UTC vs.
Revision 1.51 by root, Sat Dec 23 04:11:49 2017 UTC

… …
9#include <magic.h> 9#include <magic.h>
10 10
11#include <jpeglib.h> 11#include <jpeglib.h>
12#include <glib.h> 12#include <glib.h>
13#include <gtk/gtk.h> 13#include <gtk/gtk.h>
14#include <gdk/gdkx.h>
14#include <gdk-pixbuf/gdk-pixbuf.h> 15#include <gdk-pixbuf/gdk-pixbuf.h>
15 16
16#include <gperl.h> 17#include <gperl.h>
17#include <gtk2perl.h> 18#include <gtk2perl.h>
18 19
20#include <assert.h>
21
22#if WEBP
23#include <webp/decode.h>
24#endif
25
26#include "perlmulticore.h"
27
19#define IW 80 /* MUST match Schnauzer.pm! */ 28#define IW 80 /* MUST match Schnauzer.pm! */
20#define IH 60 /* MUST match Schnauzer.pm! */ 29#define IH 60 /* MUST match Schnauzer.pm! */
21 30
22#define RAND (seed = (seed + 7141) * 54773 % 134456) 31#define RAND (seed = (seed + 7141) * 54773 % 134456)
23 32
24#define LINELENGTH 240 33#define LINELENGTH 240
25 34
26#define ELLIPSIS "\xe2\x80\xa6" 35#define ELLIPSIS "\xe2\x80\xa6"
36
37typedef char *octet_string;
38
39static magic_t magic_cookie[2]; /* !mime, mime */
27 40
28struct jpg_err_mgr 41struct jpg_err_mgr
29{ 42{
30 struct jpeg_error_mgr err; 43 struct jpeg_error_mgr err;
31 jmp_buf setjmp_buffer; 44 jmp_buf setjmp_buffer;
32}; 45};
33 46
34static void 47static void
35cv_error_exit (j_common_ptr cinfo) 48cv_error_exit (j_common_ptr cinfo)
36{ 49{
50 cinfo->err->output_message (cinfo);
37 longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99); 51 longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
38} 52}
39 53
40static void 54static void
41cv_error_output (j_common_ptr cinfo) 55cv_error_output (j_common_ptr cinfo)
42{ 56{
57 char msg[JMSG_LENGTH_MAX];
58
59 cinfo->err->format_message (cinfo, msg);
60
61 fprintf (stderr, "JPEG decoding error: %s\n", msg);
43 return; 62 return;
44} 63}
45 64
46static void 65static void
47rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b, 66rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
… …
118 return; 137 return;
119 138
120 f->v2 /= f->n; 139 f->v2 /= f->n;
121 f->v3 /= f->n; 140 f->v3 /= f->n;
122 141
123 // this is a peculiar weightung, but it works fine
124 f->v1 /= 255.; 142 f->v1 /= 255.;
125 f->v2 /= 128. * 128.; 143 f->v2 /= 255. * 255.; f->v2 = sqrtf (f->v2);
126 f->v3 /= 128. * 128. * 64.; 144 f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
127} 145}
128 146
129static guint32 a85_val; 147static guint32 a85_val;
130static guint a85_cnt; 148static guint a85_cnt;
131static guchar a85_buf[LINELENGTH], *a85_ptr; 149static guchar a85_buf[LINELENGTH], *a85_ptr;
… …
145 if (!--a85_cnt) 163 if (!--a85_cnt)
146 { 164 {
147 a85_cnt = 4; 165 a85_cnt = 4;
148 if (a85_val) 166 if (a85_val)
149 { 167 {
150 a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85; 168 a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
151 a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85; 169 a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
152 a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85; 170 a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
153 a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85; 171 a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
154 a85_ptr[0] = (a85_val ) + 33; 172 a85_ptr[0] = (a85_val ) + 33;
155 173
156 a85_ptr += 5; 174 a85_ptr += 5;
157 } 175 }
… …
203 221
204 OUTPUT: 222 OUTPUT:
205 RETVAL 223 RETVAL
206 224
207const char * 225const char *
208magic (const char *path) 226magic (SV *path_or_data)
227 ALIAS:
228 magic = 0
229 magic_mime = 1
230 magic_buffer = 2
231 magic_buffer_mime = 3
209 CODE: 232 CODE:
210{ 233{
211 static magic_t cookie; 234 STRLEN len;
235 char *data = SvPVbyte (path_or_data, len);
212 236
237 perlinterp_release ();
238
213 if (!cookie) 239 if (!magic_cookie[0])
240 {
241 magic_cookie[0] = magic_open (MAGIC_SYMLINK);
242 magic_cookie[1] = magic_open (MAGIC_SYMLINK | MAGIC_MIME);
214 { 243 }
215 cookie = magic_open (MAGIC_NONE);
216 244
217 if (cookie) 245 RETVAL = ix & 2
218 magic_load (cookie, 0); 246 ? magic_buffer (magic_cookie[ix], data, len)
219 else 247 : magic_file (magic_cookie[ix], data);
220 XSRETURN_UNDEF;
221 }
222 248
223 RETVAL = magic_file (cookie, path); 249 perlinterp_acquire ();
224} 250}
225 OUTPUT: 251 OUTPUT:
226 RETVAL 252 RETVAL
227 253
228const char *
229magic_mime (const char *path)
230 CODE:
231{
232 static magic_t cookie;
233
234 if (!cookie)
235 {
236 cookie = magic_open (MAGIC_MIME);
237
238 if (cookie)
239 magic_load (cookie, 0);
240 else
241 XSRETURN_UNDEF;
242 }
243
244 RETVAL = magic_file (cookie, path);
245}
246 OUTPUT:
247 RETVAL
248
249# missing in Gtk2 perl module 254# missing/broken in Gtk2 perl module
255
256void
257gdk_window_clear_hints (GdkWindow *window)
258 CODE:
259 gdk_window_set_geometry_hints (window, 0, 0);
250 260
251gboolean 261gboolean
252gdk_net_wm_supports (GdkAtom property) 262gdk_net_wm_supports (GdkAtom property)
253 CODE: 263 CODE:
254#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE) 264#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
… …
260 RETVAL 270 RETVAL
261 271
262GdkPixbuf_noinc * 272GdkPixbuf_noinc *
263dealpha_expose (GdkPixbuf *pb) 273dealpha_expose (GdkPixbuf *pb)
264 CODE: 274 CODE:
275 perlinterp_release ();
265{ 276{
266 int w = gdk_pixbuf_get_width (pb); 277 int w = gdk_pixbuf_get_width (pb);
267 int h = gdk_pixbuf_get_height (pb); 278 int h = gdk_pixbuf_get_height (pb);
268 int bpp = gdk_pixbuf_get_n_channels (pb); 279 int bpp = gdk_pixbuf_get_n_channels (pb);
269 int x, y, i; 280 int x, y, i;
… …
278 for (x = 0; x < w; x++) 289 for (x = 0; x < w; x++)
279 for (y = 0; y < h; y++) 290 for (y = 0; y < h; y++)
280 for (i = 0; i < 3; i++) 291 for (i = 0; i < 3; i++)
281 dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i]; 292 dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
282} 293}
294 perlinterp_acquire ();
283 OUTPUT: 295 OUTPUT:
284 RETVAL 296 RETVAL
285 297
286GdkPixbuf_noinc * 298GdkPixbuf_noinc *
287rotate (GdkPixbuf *pb, int angle) 299rotate (GdkPixbuf *pb, int angle)
288 CODE: 300 CODE:
301 perlinterp_release ();
302 if (angle < 0)
303 angle += 360;
289 RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE 304 RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
290 : angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE 305 : angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
291 : angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN 306 : angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
292 : angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE 307 : angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
293 : angle); 308 : angle);
309 perlinterp_acquire ();
294 OUTPUT: 310 OUTPUT:
295 RETVAL 311 RETVAL
296 312
297GdkPixbuf_noinc * 313GdkPixbuf_noinc *
298load_jpeg (SV *path, int thumbnail=0) 314decode_webp (SV *image_data, int thumbnail = 0, int iw = 0, int ih = 0)
315 CODE:
316{
317#if WEBP
318 guchar *data;
319 STRLEN data_size;
320 int alpha;
321 WebPDecoderConfig config;
322 int inw, inh;
323
324 data = SvPVbyte (image_data, data_size);
325
326 perlinterp_release ();
327
328 RETVAL = 0;
329
330 if (!WebPInitDecoderConfig (&config))
331 goto err;
332
333 config.options.use_threads = 1;
334
335 if (WebPGetFeatures (data, data_size, &config.input) != VP8_STATUS_OK)
336 goto err;
337
338 inw = config.input.width;
339 inh = config.input.height;
340
341 if (thumbnail)
342 {
343 if (inw * ih > inh * iw)
344 ih = (iw * inh + inw - 1) / inw;
345 else
346 iw = (ih * inw + inh - 1) / inh;
347
348 config.options.bypass_filtering = 1;
349 config.options.no_fancy_upsampling = 1;
350
351 config.options.use_scaling = 1;
352 config.options.scaled_width = iw;
353 config.options.scaled_height = ih;
354 }
355 else
356 {
357 iw = inw;
358 ih = inh;
359 }
360
361 alpha = config.input.has_alpha;
362
363 RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, !!alpha, 8, iw, ih);
364 if (!RETVAL)
365 goto err;
366
367 config.output.colorspace = alpha ? MODE_RGBA : MODE_RGB;
368 config.output.u.RGBA.rgba = gdk_pixbuf_get_pixels (RETVAL);
369 config.output.u.RGBA.stride = gdk_pixbuf_get_rowstride (RETVAL);
370 config.output.u.RGBA.size = gdk_pixbuf_get_byte_length (RETVAL);
371 config.output.is_external_memory = 1;
372
373 if (WebPDecode (data, data_size, &config) != VP8_STATUS_OK)
374 {
375 g_object_unref (RETVAL);
376 RETVAL = 0;
377 goto err;
378 }
379
380 err:
381 perlinterp_acquire ();
382#else
383 croak ("load_webp: webp not enabled at compile time");
384#endif
385}
386 OUTPUT:
387 RETVAL
388
389GdkPixbuf_noinc *
390load_jpeg (SV *path, int thumbnail = 0, int iw = 0, int ih = 0)
299 CODE: 391 CODE:
300{ 392{
301 struct jpeg_decompress_struct cinfo; 393 struct jpeg_decompress_struct cinfo;
302 struct jpg_err_mgr jerr; 394 struct jpg_err_mgr jerr;
303 guchar *data; 395 guchar *data;
… …
310 fp = fopen (SvPVbyte_nolen (path), "rb"); 402 fp = fopen (SvPVbyte_nolen (path), "rb");
311 403
312 if (!fp) 404 if (!fp)
313 XSRETURN_UNDEF; 405 XSRETURN_UNDEF;
314 406
407 perlinterp_release ();
408
315 cinfo.err = jpeg_std_error (&jerr.err); 409 cinfo.err = jpeg_std_error (&jerr.err);
316 410
317 jerr.err.error_exit = cv_error_exit; 411 jerr.err.error_exit = cv_error_exit;
318 jerr.err.output_message = cv_error_output; 412 jerr.err.output_message = cv_error_output;
319 413
… …
323 jpeg_destroy_decompress (&cinfo); 417 jpeg_destroy_decompress (&cinfo);
324 418
325 if (pb) 419 if (pb)
326 g_object_unref ((gpointer)pb); 420 g_object_unref ((gpointer)pb);
327 421
422 perlinterp_acquire ();
328 XSRETURN_UNDEF; 423 XSRETURN_UNDEF;
329 } 424 }
330 425
331 jpeg_create_decompress (&cinfo); 426 jpeg_create_decompress (&cinfo);
332 427
… …
348 { 443 {
349 cinfo.dct_method = JDCT_FASTEST; 444 cinfo.dct_method = JDCT_FASTEST;
350 cinfo.do_fancy_upsampling = FALSE; 445 cinfo.do_fancy_upsampling = FALSE;
351 446
352 while (cinfo.scale_denom < 8 447 while (cinfo.scale_denom < 8
353 && cinfo.output_width >= IW*4 448 && cinfo.output_width >= iw*4
354 && cinfo.output_height >= IH*4) 449 && cinfo.output_height >= ih*4)
355 { 450 {
356 cinfo.scale_denom <<= 1; 451 cinfo.scale_denom <<= 1;
357 jpeg_calc_output_dimensions (&cinfo); 452 jpeg_calc_output_dimensions (&cinfo);
358 } 453 }
359 } 454 }
360 455
456 if (cinfo.output_components != 3)
457 longjmp (jerr.setjmp_buffer, 3);
458
459 if (cinfo.jpeg_color_space == JCS_YCCK || cinfo.jpeg_color_space == JCS_CMYK)
460 {
461 cinfo.out_color_space = JCS_CMYK;
462 cinfo.output_components = 4;
463 }
464
361 pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height); 465 pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, cinfo.output_components == 4, 8, cinfo.output_width, cinfo.output_height);
362 if (!RETVAL) 466 if (!RETVAL)
363 longjmp (jerr.setjmp_buffer, 2); 467 longjmp (jerr.setjmp_buffer, 2);
364 468
365 data = gdk_pixbuf_get_pixels (RETVAL); 469 data = gdk_pixbuf_get_pixels (RETVAL);
366 rs = gdk_pixbuf_get_rowstride (RETVAL); 470 rs = gdk_pixbuf_get_rowstride (RETVAL);
367
368 if (cinfo.output_components != 3)
369 longjmp (jerr.setjmp_buffer, 3);
370 471
371 jpeg_start_decompress (&cinfo); 472 jpeg_start_decompress (&cinfo);
372 473
373 while (cinfo.output_scanline < cinfo.output_height) 474 while (cinfo.output_scanline < cinfo.output_height)
374 { 475 {
… …
381 rp [3] = (guchar *)rp [2] + rs; 482 rp [3] = (guchar *)rp [2] + rs;
382 483
383 jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4); 484 jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
384 } 485 }
385 486
487 if (cinfo.out_color_space == JCS_CMYK)
488 {
489 guchar *end = data + cinfo.output_height * rs;
490
491 while (data < end)
492 {
493 U32 c = data [0];
494 U32 m = data [1];
495 U32 y = data [2];
496 U32 k = data [3];
497
498 if (0)
499 if (cinfo.Adobe_transform == 2)
500 {
501 c ^= 0xff;
502 m ^= 0xff;
503 y ^= 0xff;
504 k ^= 0xff;
505 }
506
507 data [0] = (c * k + 0x80) / 0xff;
508 data [1] = (m * k + 0x80) / 0xff;
509 data [2] = (y * k + 0x80) / 0xff;
510 data [3] = 0xff;
511
512 data += 4;
513 }
514 }
515
386 jpeg_finish_decompress (&cinfo); 516 jpeg_finish_decompress (&cinfo);
387 fclose (fp); 517 fclose (fp);
388 jpeg_destroy_decompress (&cinfo); 518 jpeg_destroy_decompress (&cinfo);
519 perlinterp_acquire ();
389} 520}
390 OUTPUT: 521 OUTPUT:
391 RETVAL 522 RETVAL
392 523
393void 524void
394compare (GdkPixbuf *a, GdkPixbuf *b) 525compare (GdkPixbuf *a, GdkPixbuf *b)
395 PPCODE: 526 PPCODE:
527 perlinterp_release ();
396{ 528{
397 int w = gdk_pixbuf_get_width (a); 529 int w = gdk_pixbuf_get_width (a);
398 int h = gdk_pixbuf_get_height (a); 530 int h = gdk_pixbuf_get_height (a);
531
399 int sa = gdk_pixbuf_get_rowstride (a); 532 int sa = gdk_pixbuf_get_rowstride (a);
400 int sb = gdk_pixbuf_get_rowstride (b); 533 int sb = gdk_pixbuf_get_rowstride (b);
401 534
402 guchar *pa = gdk_pixbuf_get_pixels (a); 535 guchar *pa = gdk_pixbuf_get_pixels (a);
403 guchar *pb = gdk_pixbuf_get_pixels (b); 536 guchar *pb = gdk_pixbuf_get_pixels (b);
… …
427 d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d)); 560 d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d));
428 d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d)); 561 d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d));
429 } 562 }
430 } 563 }
431 564
565 perlinterp_acquire ();
566
432 EXTEND (SP, 2); 567 EXTEND (SP, 2);
433 PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.))))); 568 PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
434 PUSHs (sv_2mortal (newSVnv (peak / 255.))); 569 PUSHs (sv_2mortal (newSVnv (peak / 255.)));
435} 570}
436 571
437############################################################################# 572#############################################################################
438 573
439MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer 574MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
440 575
576# currently only works for filenames (octet strings)
577
441SV * 578SV *
442foldcase (SV *pathsv) 579foldcase (SV *pathsv)
443 PROTOTYPE: $ 580 PROTOTYPE: $
444 CODE: 581 CODE:
445{ 582{
446 STRLEN plen; 583 STRLEN plen;
447 U8 *path = (U8 *)SvPVutf8 (pathsv, plen); 584 U8 *path = (U8 *)SvPV (pathsv, plen);
448 U8 *pend = path + plen; 585 U8 *pend = path + plen;
449 U8 dst [plen * 6 * 3], *dstp = dst; 586 U8 dst [plen * 6 * 3], *dstp = dst;
450 587
451 while (path < pend) 588 while (path < pend)
452 { 589 {
453 U8 ch = *path; 590 U8 ch = *path;
454 591
455 if (ch >= 'a' && ch <= 'z') 592 if (ch >= 'a' && ch <= 'z')
456 *dstp++ = *path++; 593 *dstp++ = *path++;
594 else if (ch >= 'A' && ch <= 'Z')
595 *dstp++ = *path++ + ('a' - 'A');
457 else if (ch >= '0' && ch <= '9') 596 else if (ch >= '0' && ch <= '9')
458 { 597 {
459 STRLEN el, nl = 0; 598 STRLEN el, nl = 0;
460 while (*path >= '0' && *path <= '9' && path < pend) 599 while (*path >= '0' && *path <= '9' && path < pend)
461 path++, nl++; 600 path++, nl++;
… …
464 *dstp++ = '0'; 603 *dstp++ = '0';
465 604
466 memcpy (dstp, path - nl, nl); 605 memcpy (dstp, path - nl, nl);
467 dstp += nl; 606 dstp += nl;
468 } 607 }
608 else
609 *dstp++ = *path++;
610#if 0
469 else 611 else
470 { 612 {
471 STRLEN cl; 613 STRLEN cl;
472 to_utf8_fold (path, dstp, &cl); 614 to_utf8_fold (path, dstp, &cl);
473 dstp += cl; 615 dstp += cl;
474 path += is_utf8_char (path); 616 path += is_utf8_char (path);
475 } 617 }
618#endif
476 } 619 }
477 620
478 RETVAL = newSVpvn ((const char *)dst, dstp - dst); 621 RETVAL = newSVpvn ((const char *)dst, dstp - dst);
479} 622}
480 OUTPUT: 623 OUTPUT:
… …
649{ 792{
650 int i; 793 int i;
651 AV *av, *result; 794 AV *av, *result;
652 795
653 if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV) 796 if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV)
654 croak ("Not an array ref as first argument to make_histogram"); 797 croak ("Not an array ref as first argument to extract_features");
655 798
656 av = (AV *) SvRV (ar); 799 av = (AV *) SvRV (ar);
657 result = newAV (); 800 result = newAV ();
658 801
659 for (i = 0; i <= av_len (av); ++i) 802 for (i = 0; i <= av_len (av); ++i)
… …
712 feature_finish_pass_2 (&f_v); 855 feature_finish_pass_2 (&f_v);
713 } 856 }
714 857
715 hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.; 858 hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
716 hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ; 859 hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ;
717 hist [6] = f_v.v1 ; hist [7] = f_v.v2 ; hist [8] = f_v.v3 ; 860 hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;
718 861
719 av_push (result, histsv); 862 av_push (result, histsv);
720 } 863 }
721 864
722 RETVAL = newRV_noinc ((SV *)result); 865 RETVAL = newRV_noinc ((SV *)result);
723} 866}
724 OUTPUT: 867 OUTPUT:
725 RETVAL 868 RETVAL
726 869
727SV *
728make_histograms (SV *ar)
729 CODE:
730{
731 int i;
732 AV *av, *result;
733
734 if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV)
735 croak ("Not an array ref as first argument to make_histogram");
736
737 av = (AV *) SvRV (ar);
738 result = newAV ();
739
740 for (i = 0; i <= av_len (av); ++i)
741 {
742 const int HISTSIZE = 64;
743
744 int j;
745 SV *sv = *av_fetch (av, i, 1);
746 STRLEN len;
747 char *buf = SvPVbyte (sv, len);
748
749 int tmphist[HISTSIZE];
750 float *hist;
751
752 SV *histsv = newSV (HISTSIZE * sizeof (float) + 1);
753 SvPOK_on (histsv);
754 SvCUR_set (histsv, HISTSIZE * sizeof (float));
755 hist = (float *)SvPVX (histsv);
756
757 Zero (tmphist, sizeof (tmphist), char);
758
759 for (j = len; j--; )
760 {
761 unsigned int idx
762 = ((*buf & 0xc0) >> 2)
763 | ((*buf & 0x18) >> 1)
764 | (*buf & 0x03);
765
766 ++tmphist[idx];
767 ++buf;
768 }
769
770 for (j = 0; j < HISTSIZE; ++j)
771 hist[j] = (float)tmphist[j] / (len + 1e-30);
772
773 av_push (result, histsv);
774 }
775
776 RETVAL = newRV_noinc ((SV *)result);
777}
778 OUTPUT:
779 RETVAL
780
781

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