CV/CV.xs

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <string.h>
#include <setjmp.h>
#include <math.h>

#include <magic.h>

#include <jpeglib.h>
#include <glib.h>
#include <gtk/gtk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

#include <gperl.h>
#include <gtk2perl.h>

#include <assert.h>

#include "perlmulticore.h"

#define IW 80 /* MUST match Schnauzer.pm! */
#define IH 60 /* MUST match Schnauzer.pm! */

#define RAND (seed = (seed + 7141) * 54773 % 134456)

#define LINELENGTH 240

#define ELLIPSIS "\xe2\x80\xa6"

typedef char *octet_string;

struct jpg_err_mgr
{
  struct jpeg_error_mgr err;
  jmp_buf setjmp_buffer;
};

static void
cv_error_exit (j_common_ptr cinfo)
{
  cinfo->err->output_message (cinfo);
  longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
}

static void
cv_error_output (j_common_ptr cinfo)
{
  char msg[JMSG_LENGTH_MAX];

  cinfo->err->format_message (cinfo, msg);

  fprintf (stderr, "JPEG decoding error: %s\n", msg);
  return;
}

static void
rgb_to_hsv (unsigned int  r, unsigned int  g, unsigned int  b,
            unsigned int *h, unsigned int *s, unsigned int *v)
{
  unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
  unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
  unsigned int delta = mx - mn;

  *v = mx;

  *s = mx ? delta * 255 / mx : 0;

  if (delta == 0)
    *h = 0;
  else
    {
      if (r == mx)
        *h = ((int)g - (int)b) * 255 / (int)(delta * 3);
      else if (g == mx)
        *h = ((int)b - (int)r) * 255 / (int)(delta * 3) + 52;
      else if (b == mx)
        *h = ((int)r - (int)g) * 255 / (int)(delta * 3) + 103;

      *h &= 255;
    }
}

struct feature {
  float v1, v2, v3; // mean, square, cube
  int n;
};

static void
feature_init (struct feature *f)
{
  f->v1 = 0.;
  f->v2 = 0.;
  f->v3 = 0.;
  f->n  = 0;
}

// didn't find an algorithm to neatly do mean, variance and skew in one pass.
// elmex ist schuld.
static void
feature_update_pass_1 (struct feature *f, unsigned int v)
{
  f->v1 += v;
  f->n  += 1;
}

static void
feature_finish_pass_1 (struct feature *f)
{
  if (f->n < 1)
    return;

  f->v1 /= f->n;
}

static void
feature_update_pass_2 (struct feature *f, unsigned int v)
{
  float d = v - f->v1;

  f->v2 += d * d;
  f->v3 += d * d * d;
}

static void
feature_finish_pass_2 (struct feature *f)
{
  if (f->n < 1)
    return;

  f->v2 /= f->n;
  f->v3 /= f->n;

  f->v1 /= 255.;
  f->v2 /= 255. * 255.;        f->v2 = sqrtf (f->v2);
  f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
}

static guint32 a85_val;
static guint a85_cnt;
static guchar a85_buf[LINELENGTH], *a85_ptr;

static void
a85_init (void)
{
  a85_cnt = 4;
  a85_ptr = a85_buf;
}

static void
a85_push (PerlIO *fp, guchar c)
{
  a85_val = a85_val << 8 | c;

  if (!--a85_cnt)
    {
      a85_cnt = 4;
      if (a85_val)
        {
          a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85; 
          a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85; 
          a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85; 
          a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
          a85_ptr[0] = (a85_val     ) + 33;

          a85_ptr += 5;
        }
      else
        *a85_ptr++ = 'z';

      if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
        {
          *a85_ptr++ = '\n';
          PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
          a85_ptr = a85_buf;
        }
    }
    
}

static void
a85_finish (PerlIO *fp)
{
  while (a85_cnt != 4)
    a85_push (fp, 0);

  *a85_ptr++ = '~'; // probably buggy end-marker
  *a85_ptr++ = '>'; // probably buggy end-marker
  *a85_ptr++ = '\n';

  PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
}

/////////////////////////////////////////////////////////////////////////////

MODULE = Gtk2::CV PACKAGE = Gtk2::CV

PROTOTYPES: ENABLE

# missing function in perl. really :)
int
common_prefix_length (a, b)
        unsigned char *a = (unsigned char *)SvPVutf8_nolen ($arg);
        unsigned char *b = (unsigned char *)SvPVutf8_nolen ($arg);
        CODE:
        RETVAL = 0;

        while (*a == *b && *a)
          {
            RETVAL += (*a & 0xc0) != 0x80;
            a++, b++;
          }

        OUTPUT:
        RETVAL

const char *
magic (octet_string path)
        CODE:
{
        static magic_t cookie;

        if (!cookie)
          {
            cookie = magic_open (MAGIC_SYMLINK);

            if (cookie)
              magic_load (cookie, 0);
            else
              XSRETURN_UNDEF;
          }

        RETVAL = magic_file (cookie, path);
}
        OUTPUT:
        RETVAL

const char *
magic_mime (octet_string path)
        CODE:
{
        static magic_t cookie;

        if (!cookie)
          {
            cookie = magic_open (MAGIC_MIME | MAGIC_SYMLINK);

            if (cookie)
              magic_load (cookie, 0);
            else
              XSRETURN_UNDEF;
          }

        perlinterp_release ();
        RETVAL = magic_file (cookie, path);
        perlinterp_acquire ();
}
        OUTPUT:
        RETVAL

# missing/broken in Gtk2 perl module

void
gdk_window_clear_hints (GdkWindow *window)
        CODE:
        gdk_window_set_geometry_hints (window, 0, 0);

gboolean
gdk_net_wm_supports (GdkAtom property)
        CODE:
#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
        RETVAL = gdk_net_wm_supports (property);
#else
        RETVAL = 0;
#endif
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
dealpha_expose (GdkPixbuf *pb)
        CODE:
        perlinterp_release ();
{
        int w = gdk_pixbuf_get_width (pb);
        int h = gdk_pixbuf_get_height (pb);
        int bpp = gdk_pixbuf_get_n_channels (pb);
        int x, y, i;
        guchar *src = gdk_pixbuf_get_pixels (pb), *dst;
        int sstr = gdk_pixbuf_get_rowstride (pb), dstr;

        RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);

        dst = gdk_pixbuf_get_pixels (RETVAL);
        dstr = gdk_pixbuf_get_rowstride (RETVAL);

        for (x = 0; x < w; x++)
          for (y = 0; y < h; y++)
            for (i = 0; i < 3; i++)
              dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
}
        perlinterp_acquire ();
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
rotate (GdkPixbuf *pb, int angle)
        CODE:
        perlinterp_release ();
        if (angle < 0)
          angle += 360;
        RETVAL = gdk_pixbuf_rotate_simple (pb, angle ==   0 ? GDK_PIXBUF_ROTATE_NONE
                                             : angle ==  90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
                                             : angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
                                             : angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
                                             : angle);
        perlinterp_acquire ();
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
load_jpeg (SV *path, int thumbnail = 0, int iw = 0, int ih = 0)
        CODE:
{
        struct jpeg_decompress_struct cinfo;
        struct jpg_err_mgr jerr;
        guchar *data;
        int rs;
        FILE *fp;
        volatile GdkPixbuf *pb = 0;

        RETVAL = 0;

        fp = fopen (SvPVbyte_nolen (path), "rb");

        if (!fp)
          XSRETURN_UNDEF;

        perlinterp_release ();

        cinfo.err = jpeg_std_error (&jerr.err);

        jerr.err.error_exit     = cv_error_exit;
        jerr.err.output_message = cv_error_output;

        if ((rs = setjmp (jerr.setjmp_buffer)))
          {
            fclose (fp);
            jpeg_destroy_decompress (&cinfo);

            if (pb)
              g_object_unref ((gpointer)pb);

            perlinterp_acquire ();
            XSRETURN_UNDEF;
          }

        jpeg_create_decompress (&cinfo);

        jpeg_stdio_src (&cinfo, fp);
        jpeg_read_header (&cinfo, TRUE);

        cinfo.dct_method          = JDCT_DEFAULT;
        cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
        cinfo.do_block_smoothing  = FALSE;
        cinfo.out_color_space     = JCS_RGB;
        cinfo.quantize_colors     = FALSE;

        cinfo.scale_num   = 1;
        cinfo.scale_denom = 1;

        jpeg_calc_output_dimensions (&cinfo);

        if (thumbnail)
          {
            cinfo.dct_method          = JDCT_FASTEST;
            cinfo.do_fancy_upsampling = FALSE;

            while (cinfo.scale_denom < 8
                   && cinfo.output_width  >= iw*4
                   && cinfo.output_height >= ih*4)
              {
                cinfo.scale_denom <<= 1;
                jpeg_calc_output_dimensions (&cinfo);
              }
          }

        if (cinfo.output_components != 3)
          longjmp (jerr.setjmp_buffer, 3);

        if (cinfo.jpeg_color_space == JCS_YCCK || cinfo.jpeg_color_space == JCS_CMYK)
          {
            cinfo.out_color_space = JCS_CMYK;
            cinfo.output_components = 4;
          }

        pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, cinfo.output_components == 4, 8,  cinfo.output_width, cinfo.output_height);
        if (!RETVAL)
          longjmp (jerr.setjmp_buffer, 2);

        data = gdk_pixbuf_get_pixels (RETVAL);
        rs = gdk_pixbuf_get_rowstride (RETVAL);

        jpeg_start_decompress (&cinfo);

        while (cinfo.output_scanline < cinfo.output_height)
          {
            int remaining = cinfo.output_height - cinfo.output_scanline;
            JSAMPROW rp[4];

            rp [0] = data + cinfo.output_scanline * rs;
            rp [1] = (guchar *)rp [0] + rs;
            rp [2] = (guchar *)rp [1] + rs;
            rp [3] = (guchar *)rp [2] + rs;

            jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
          }

        if (cinfo.out_color_space == JCS_CMYK)
          {
            guchar *end = data + cinfo.output_height * rs;

            while (data < end)
              {
                U32 c = data [0];
                U32 m = data [1];
                U32 y = data [2];
                U32 k = data [3];

                data [0] = c * k / 255;
                data [1] = m * k / 255;
                data [2] = y * k / 255;
                data [3] = 255;

                data += 4;
              }
          }

        jpeg_finish_decompress (&cinfo);
        fclose (fp);
        jpeg_destroy_decompress (&cinfo);
        perlinterp_acquire ();
}
        OUTPUT:
        RETVAL

void
compare (GdkPixbuf *a, GdkPixbuf *b)
        PPCODE:
        perlinterp_release ();
{
        int w  = gdk_pixbuf_get_width  (a);
        int h  = gdk_pixbuf_get_height (a);

        int sa = gdk_pixbuf_get_rowstride (a);
        int sb = gdk_pixbuf_get_rowstride (b);

        guchar *pa = gdk_pixbuf_get_pixels (a);
        guchar *pb = gdk_pixbuf_get_pixels (b);

        int x, y;

        assert (w == gdk_pixbuf_get_width  (b));
        assert (h == gdk_pixbuf_get_height (b));

        assert (gdk_pixbuf_get_n_channels (a) == 3);
        assert (gdk_pixbuf_get_n_channels (b) == 3);

        double diff = 0.;
        int peak = 0;

        if (w && h)
          for (y = 0; y < h; y++)
            {
              guchar *pa_ = pa + y * sa;
              guchar *pb_ = pb + y * sb;

              for (x = 0; x < w; x++)
                {
                  int d;

                  d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d));
                  d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d));
                  d = ((int)*pa_++) - ((int)*pb_++); diff += d*d; peak = MAX (peak, abs (d));
                }
            }

        perlinterp_acquire ();

        EXTEND (SP, 2);
        PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
        PUSHs (sv_2mortal (newSVnv (peak / 255.)));
}

#############################################################################

MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer

# currently only works for filenames (octet strings)

SV *
foldcase (SV *pathsv)
        PROTOTYPE: $
        CODE:
{
        STRLEN plen;
        U8 *path = (U8 *)SvPV (pathsv, plen);
        U8 *pend = path + plen;
        U8 dst [plen * 6 * 3], *dstp = dst;

        while (path < pend)
          {
            U8 ch = *path;

            if (ch >= 'a' && ch <= 'z')
              *dstp++ = *path++;
            else if (ch >= 'A' && ch <= 'Z')
              *dstp++ = *path++ + ('a' - 'A');
            else if (ch >= '0' && ch <= '9')
              {
                STRLEN el, nl = 0;
                while (*path >= '0' && *path <= '9' && path < pend)
                  path++, nl++;

                for (el = nl; el < 6; el++)
                  *dstp++ = '0';

                memcpy (dstp, path - nl, nl);
                dstp += nl;
              }
            else
              *dstp++ = *path++;
#if 0
            else
              {
                STRLEN cl;
                to_utf8_fold (path, dstp, &cl);
                dstp += cl;
                path += is_utf8_char (path);
              }
#endif
          }

        RETVAL = newSVpvn ((const char *)dst, dstp - dst);
}
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
p7_to_pb (int w, int h, SV *src_sv)
        PROTOTYPE: @
        CODE:
{
        int x, y;
        guchar *dst, *d;
        int dstr;
        guchar *src = (guchar *)SvPVbyte_nolen (src_sv);

        RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8,  w, h);
        dst = gdk_pixbuf_get_pixels (RETVAL);
        dstr = gdk_pixbuf_get_rowstride (RETVAL);

        for (y = 0; y < h; y++)
          for (d = dst + y * dstr, x = 0; x < w; x++)
            {
              *d++ = (((*src >> 5) & 7) * 255 + 4) / 7;
              *d++ = (((*src >> 2) & 7) * 255 + 4) / 7;
              *d++ = (((*src >> 0) & 3) * 255 + 2) / 3;

              src++;
            }
}
        OUTPUT:
        RETVAL

#############################################################################

MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript

void
dump_ascii85 (PerlIO *fp, GdkPixbuf *pb)
        CODE:
{
        int w = gdk_pixbuf_get_width  (pb);
        int h = gdk_pixbuf_get_height (pb);
        int x, y, i;
        guchar *dst;
        int bpp = gdk_pixbuf_get_n_channels (pb);
        guchar *src = gdk_pixbuf_get_pixels (pb);
        int sstr = gdk_pixbuf_get_rowstride (pb);

        a85_init ();

        for (y = 0; y < h; y++)
          for (x = 0; x < w; x++)
            for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
              a85_push (fp, src [x * bpp + y * sstr + i]);

        a85_finish (fp);
}

void
dump_binary (PerlIO *fp, GdkPixbuf *pb)
        CODE:
{
        int w = gdk_pixbuf_get_width  (pb);
        int h = gdk_pixbuf_get_height (pb);
        int x, y, i;
        guchar *dst;
        int bpp = gdk_pixbuf_get_n_channels (pb);
        guchar *src = gdk_pixbuf_get_pixels (pb);
        int sstr = gdk_pixbuf_get_rowstride (pb);

        for (y = 0; y < h; y++)
          for (x = 0; x < w; x++)
            for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
              PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
}

#############################################################################

MODULE = Gtk2::CV PACKAGE = Gtk2::CV

SV *
pb_to_hv84 (GdkPixbuf *pb)
        CODE:
{
        int w = gdk_pixbuf_get_width  (pb);
        int h = gdk_pixbuf_get_height (pb);
        int x, y;
        guchar *dst;
        int bpp = gdk_pixbuf_get_n_channels (pb);
        guchar *src = gdk_pixbuf_get_pixels (pb);
        int sstr = gdk_pixbuf_get_rowstride (pb);

        RETVAL = newSV (6 * 8 * 12 / 8);
        SvPOK_only (RETVAL);
        SvCUR_set (RETVAL, 6 * 8 * 12 / 8);

        dst = (guchar *)SvPVX (RETVAL);

        /* some primitive error distribution + random dithering */

        for (y = 0; y < h; y++)
          {
            guchar *p = src + y * sstr;

            for (x = 0; x < w; x += 2)
              {
                unsigned int r, g, b, h, s, v, H, V1, V2;

                if (bpp == 3)
                  r = *p++, g = *p++, b = *p++;
                else if (bpp == 1)
                  r = g = b = *p++;
                else
                  abort ();

                rgb_to_hsv (r, g, b, &h, &s, &v);

                H = (h * 15 / 255) << 4;
                V1 = v;

                if (bpp == 3)
                  r = *p++, g = *p++, b = *p++;
                else if (bpp == 1)
                  r = g = b = *p++;
                else
                  abort ();

                rgb_to_hsv (r, g, b, &h, &s, &v);

                H |= h * 15 / 255;
                V2 = v;

                *dst++ = H;
                *dst++ = V1;
                *dst++ = V2;
              }
          }
}
        OUTPUT:
        RETVAL

SV *
hv84_to_av (unsigned char *hv84)
        CODE:
{
        int i = 72 / 3;
        AV *av = newAV ();

        RETVAL = (SV *)newRV_noinc ((SV *)av);
        while (i--)
          {
            int h  = *hv84++;
            int v1 = *hv84++;
            int v2 = *hv84++;

            av_push (av, newSViv (v1));
            av_push (av, newSViv ((h >> 4) * 255 / 15));
            av_push (av, newSViv (v2));
            av_push (av, newSViv ((h & 15) * 255 / 15));
          }
}
        OUTPUT:
        RETVAL

#############################################################################

MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster

SV *
extract_features (SV *ar)
        CODE:
{
        int i;
        AV *av, *result;

        if (!SvROK (ar) || SvTYPE (SvRV (ar)) != SVt_PVAV)
          croak ("Not an array ref as first argument to extract_features");

        av = (AV *) SvRV (ar);
        result = newAV ();

        for (i = 0; i <= av_len (av); ++i)
          {
            SV *sv = *av_fetch (av, i, 1);
            SV *histsv = newSV (9 * sizeof (float) + 1);

            SvPOK_on (histsv);
            SvCUR_set (histsv, 9 * sizeof (float));
            float *hist = (float *)SvPVX (histsv);

            struct feature f_h, f_s, f_v;
            feature_init (&f_h);
            feature_init (&f_s);
            feature_init (&f_v);

            {
              STRLEN len;
              unsigned char *buf = (unsigned char *)SvPVbyte (sv, len);
              while (len >= 3)
                {
                  unsigned int r, g, b, h, s, v;
                  r = *buf++; g = *buf++; b = *buf++;
                  rgb_to_hsv (r, g, b, &h, &s, &v);

                  feature_update_pass_1 (&f_h, h);
                  feature_update_pass_1 (&f_s, s);
                  feature_update_pass_1 (&f_v, v);

                  len -= 3;
                }

              feature_finish_pass_1 (&f_h);
              feature_finish_pass_1 (&f_s);
              feature_finish_pass_1 (&f_v);
            }

            {
              STRLEN len;
              unsigned char *buf = (unsigned char *)SvPVbyte (sv, len);
              while (len >= 3)
                {
                  unsigned int r, g, b, h, s, v;
                  r = *buf++; g = *buf++; b = *buf++;
                  rgb_to_hsv (r, g, b, &h, &s, &v);

                  feature_update_pass_2 (&f_h, h);
                  feature_update_pass_2 (&f_s, s);
                  feature_update_pass_2 (&f_v, v);

                  len -= 3;
                }

              feature_finish_pass_2 (&f_h);
              feature_finish_pass_2 (&f_s);
              feature_finish_pass_2 (&f_v);
            }

            hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
            hist [3] = f_s.v1     ; hist [4] = f_s.v2     ; hist [5] = f_s.v3     ;
            hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;

            av_push (result, histsv);
          }

        RETVAL = newRV_noinc ((SV *)result);
}
        OUTPUT:
        RETVAL

Revision:	1.48
Committed:	Wed May 24 05:00:57 2017 UTC (6 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.47:	+36 -4 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5	root	1.18	#include <string.h>
6	root	1.17	#include <setjmp.h>
7	root	1.33	#include <math.h>
8	root	1.17
9	root	1.31	#include <magic.h>
10
11	root	1.17	#include <jpeglib.h>
12	root	1.23	#include <glib.h>
13			#include <gtk/gtk.h>
14	root	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
15
16			#include <gperl.h>
17			#include <gtk2perl.h>
18
19	root	1.43	#include <assert.h>
20
21	root	1.46	#include "perlmulticore.h"
22
23	root	1.33	#define IW 80 /* MUST match Schnauzer.pm! */
24			#define IH 60 /* MUST match Schnauzer.pm! */
25	root	1.5
26			#define RAND (seed = (seed + 7141) * 54773 % 134456)
27
28	root	1.7	#define LINELENGTH 240
29
30	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
31
32	root	1.42	typedef char *octet_string;
33
34	root	1.17	struct jpg_err_mgr
35			{
36			struct jpeg_error_mgr err;
37			jmp_buf setjmp_buffer;
38			};
39
40			static void
41			cv_error_exit (j_common_ptr cinfo)
42			{
43	root	1.48	cinfo->err->output_message (cinfo);
44	root	1.17	longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
45			}
46
47			static void
48			cv_error_output (j_common_ptr cinfo)
49			{
50	root	1.48	char msg[JMSG_LENGTH_MAX];
51
52			cinfo->err->format_message (cinfo, msg);
53
54			fprintf (stderr, "JPEG decoding error: %s\n", msg);
55	root	1.17	return;
56			}
57
58			static void
59			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
60			unsigned int h, unsigned int s, unsigned int *v)
61			{
62			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
63			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
64			unsigned int delta = mx - mn;
65
66			*v = mx;
67
68			s = mx ? delta 255 / mx : 0;
69
70			if (delta == 0)
71			*h = 0;
72			else
73			{
74			if (r == mx)
75			h = ((int)g - (int)b) 255 / (int)(delta * 3);
76			else if (g == mx)
77			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
78			else if (b == mx)
79			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
80
81			*h &= 255;
82			}
83			}
84
85	root	1.36	struct feature {
86			float v1, v2, v3; // mean, square, cube
87			int n;
88			};
89
90			static void
91			feature_init (struct feature *f)
92			{
93			f->v1 = 0.;
94			f->v2 = 0.;
95			f->v3 = 0.;
96			f->n = 0;
97			}
98
99			// didn't find an algorithm to neatly do mean, variance and skew in one pass.
100			// elmex ist schuld.
101			static void
102			feature_update_pass_1 (struct feature *f, unsigned int v)
103			{
104			f->v1 += v;
105			f->n += 1;
106			}
107
108			static void
109			feature_finish_pass_1 (struct feature *f)
110			{
111			if (f->n < 1)
112			return;
113
114			f->v1 /= f->n;
115			}
116
117			static void
118			feature_update_pass_2 (struct feature *f, unsigned int v)
119			{
120			float d = v - f->v1;
121
122			f->v2 += d * d;
123			f->v3 += d * d * d;
124			}
125
126			static void
127			feature_finish_pass_2 (struct feature *f)
128			{
129			if (f->n < 1)
130			return;
131
132			f->v2 /= f->n;
133			f->v3 /= f->n;
134
135			f->v1 /= 255.;
136	root	1.37	f->v2 /= 255. * 255.; f->v2 = sqrtf (f->v2);
137			f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
138	root	1.36	}
139
140	root	1.4	static guint32 a85_val;
141			static guint a85_cnt;
142	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
143	root	1.4
144			static void
145			a85_init (void)
146			{
147			a85_cnt = 4;
148			a85_ptr = a85_buf;
149			}
150
151			static void
152			a85_push (PerlIO *fp, guchar c)
153			{
154			a85_val = a85_val << 8 \| c;
155
156			if (!--a85_cnt)
157			{
158			a85_cnt = 4;
159			if (a85_val)
160			{
161			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
162			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
163			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
164			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
165			a85_ptr[0] = (a85_val ) + 33;
166
167			a85_ptr += 5;
168			}
169			else
170			*a85_ptr++ = 'z';
171
172			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
173			{
174			*a85_ptr++ = '\n';
175			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
176			a85_ptr = a85_buf;
177			}
178			}
179
180			}
181
182	root	1.8	static void
183	root	1.4	a85_finish (PerlIO *fp)
184			{
185			while (a85_cnt != 4)
186			a85_push (fp, 0);
187
188			*a85_ptr++ = '~'; // probably buggy end-marker
189			*a85_ptr++ = '>'; // probably buggy end-marker
190			*a85_ptr++ = '\n';
191
192			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
193			}
194
195	root	1.6	/////////////////////////////////////////////////////////////////////////////
196
197	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
198	root	1.1
199			PROTOTYPES: ENABLE
200	root	1.2
201	root	1.29	# missing function in perl. really :)
202			int
203			common_prefix_length (a, b)
204			unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
205			unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
206			CODE:
207			RETVAL = 0;
208
209			while (a == b && *a)
210			{
211			RETVAL += (*a & 0xc0) != 0x80;
212			a++, b++;
213			}
214
215			OUTPUT:
216			RETVAL
217
218	root	1.31	const char *
219	root	1.42	magic (octet_string path)
220	root	1.31	CODE:
221			{
222			static magic_t cookie;
223
224			if (!cookie)
225			{
226	root	1.45	cookie = magic_open (MAGIC_SYMLINK);
227	root	1.32
228			if (cookie)
229			magic_load (cookie, 0);
230			else
231			XSRETURN_UNDEF;
232			}
233
234			RETVAL = magic_file (cookie, path);
235			}
236			OUTPUT:
237			RETVAL
238
239			const char *
240	root	1.42	magic_mime (octet_string path)
241	root	1.32	CODE:
242			{
243			static magic_t cookie;
244
245			if (!cookie)
246			{
247	root	1.45	cookie = magic_open (MAGIC_MIME \| MAGIC_SYMLINK);
248	root	1.31
249			if (cookie)
250			magic_load (cookie, 0);
251			else
252			XSRETURN_UNDEF;
253			}
254
255	root	1.46	perlinterp_release ();
256	root	1.31	RETVAL = magic_file (cookie, path);
257	root	1.46	perlinterp_acquire ();
258	root	1.31	}
259			OUTPUT:
260			RETVAL
261
262	root	1.40	# missing/broken in Gtk2 perl module
263
264			void
265			gdk_window_clear_hints (GdkWindow *window)
266			CODE:
267			gdk_window_set_geometry_hints (window, 0, 0);
268	root	1.22
269			gboolean
270			gdk_net_wm_supports (GdkAtom property)
271			CODE:
272			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
273			RETVAL = gdk_net_wm_supports (property);
274			#else
275			RETVAL = 0;
276			#endif
277			OUTPUT:
278			RETVAL
279
280	root	1.3	GdkPixbuf_noinc *
281	root	1.26	dealpha_expose (GdkPixbuf *pb)
282			CODE:
283	root	1.46	perlinterp_release ();
284	root	1.26	{
285			int w = gdk_pixbuf_get_width (pb);
286			int h = gdk_pixbuf_get_height (pb);
287			int bpp = gdk_pixbuf_get_n_channels (pb);
288			int x, y, i;
289			guchar src = gdk_pixbuf_get_pixels (pb), dst;
290			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
291
292			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
293
294			dst = gdk_pixbuf_get_pixels (RETVAL);
295			dstr = gdk_pixbuf_get_rowstride (RETVAL);
296
297			for (x = 0; x < w; x++)
298			for (y = 0; y < h; y++)
299			for (i = 0; i < 3; i++)
300			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
301			}
302	root	1.46	perlinterp_acquire ();
303	root	1.26	OUTPUT:
304			RETVAL
305
306			GdkPixbuf_noinc *
307	root	1.28	rotate (GdkPixbuf *pb, int angle)
308	root	1.2	CODE:
309	root	1.46	perlinterp_release ();
310	root	1.44	if (angle < 0)
311			angle += 360;
312	root	1.28	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
313			: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
314			: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
315			: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
316			: angle);
317	root	1.46	perlinterp_acquire ();
318	root	1.2	OUTPUT:
319			RETVAL
320
321	root	1.17	GdkPixbuf_noinc *
322	root	1.47	load_jpeg (SV *path, int thumbnail = 0, int iw = 0, int ih = 0)
323	root	1.17	CODE:
324			{
325			struct jpeg_decompress_struct cinfo;
326			struct jpg_err_mgr jerr;
327			guchar *data;
328			int rs;
329			FILE *fp;
330			volatile GdkPixbuf *pb = 0;
331	root	1.23
332	root	1.17	RETVAL = 0;
333
334	root	1.30	fp = fopen (SvPVbyte_nolen (path), "rb");
335	root	1.23
336			if (!fp)
337	root	1.17	XSRETURN_UNDEF;
338
339	root	1.46	perlinterp_release ();
340
341	root	1.17	cinfo.err = jpeg_std_error (&jerr.err);
342
343			jerr.err.error_exit = cv_error_exit;
344			jerr.err.output_message = cv_error_output;
345
346			if ((rs = setjmp (jerr.setjmp_buffer)))
347			{
348			fclose (fp);
349			jpeg_destroy_decompress (&cinfo);
350
351			if (pb)
352			g_object_unref ((gpointer)pb);
353
354	root	1.46	perlinterp_acquire ();
355	root	1.17	XSRETURN_UNDEF;
356			}
357
358			jpeg_create_decompress (&cinfo);
359
360			jpeg_stdio_src (&cinfo, fp);
361			jpeg_read_header (&cinfo, TRUE);
362
363			cinfo.dct_method = JDCT_DEFAULT;
364			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
365			cinfo.do_block_smoothing = FALSE;
366			cinfo.out_color_space = JCS_RGB;
367			cinfo.quantize_colors = FALSE;
368
369			cinfo.scale_num = 1;
370			cinfo.scale_denom = 1;
371
372			jpeg_calc_output_dimensions (&cinfo);
373
374			if (thumbnail)
375			{
376			cinfo.dct_method = JDCT_FASTEST;
377			cinfo.do_fancy_upsampling = FALSE;
378
379			while (cinfo.scale_denom < 8
380	root	1.47	&& cinfo.output_width >= iw*4
381			&& cinfo.output_height >= ih*4)
382	root	1.17	{
383			cinfo.scale_denom <<= 1;
384			jpeg_calc_output_dimensions (&cinfo);
385			}
386			}
387
388	root	1.48	if (cinfo.output_components != 3)
389			longjmp (jerr.setjmp_buffer, 3);
390
391			if (cinfo.jpeg_color_space == JCS_YCCK \|\| cinfo.jpeg_color_space == JCS_CMYK)
392			{
393			cinfo.out_color_space = JCS_CMYK;
394			cinfo.output_components = 4;
395			}
396
397			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, cinfo.output_components == 4, 8, cinfo.output_width, cinfo.output_height);
398	root	1.17	if (!RETVAL)
399			longjmp (jerr.setjmp_buffer, 2);
400
401			data = gdk_pixbuf_get_pixels (RETVAL);
402			rs = gdk_pixbuf_get_rowstride (RETVAL);
403
404			jpeg_start_decompress (&cinfo);
405
406			while (cinfo.output_scanline < cinfo.output_height)
407			{
408			int remaining = cinfo.output_height - cinfo.output_scanline;
409			JSAMPROW rp[4];
410
411			rp [0] = data + cinfo.output_scanline * rs;
412			rp [1] = (guchar *)rp [0] + rs;
413			rp [2] = (guchar *)rp [1] + rs;
414			rp [3] = (guchar *)rp [2] + rs;
415
416			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
417			}
418
419	root	1.48	if (cinfo.out_color_space == JCS_CMYK)
420			{
421			guchar end = data + cinfo.output_height rs;
422
423			while (data < end)
424			{
425			U32 c = data [0];
426			U32 m = data [1];
427			U32 y = data [2];
428			U32 k = data [3];
429
430			data [0] = c * k / 255;
431			data [1] = m * k / 255;
432			data [2] = y * k / 255;
433			data [3] = 255;
434
435			data += 4;
436			}
437			}
438
439	root	1.17	jpeg_finish_decompress (&cinfo);
440			fclose (fp);
441			jpeg_destroy_decompress (&cinfo);
442	root	1.46	perlinterp_acquire ();
443	root	1.17	}
444			OUTPUT:
445			RETVAL
446
447	root	1.33	void
448			compare (GdkPixbuf a, GdkPixbuf b)
449			PPCODE:
450	root	1.46	perlinterp_release ();
451	root	1.33	{
452			int w = gdk_pixbuf_get_width (a);
453			int h = gdk_pixbuf_get_height (a);
454	root	1.43
455	root	1.33	int sa = gdk_pixbuf_get_rowstride (a);
456			int sb = gdk_pixbuf_get_rowstride (b);
457
458			guchar *pa = gdk_pixbuf_get_pixels (a);
459			guchar *pb = gdk_pixbuf_get_pixels (b);
460
461			int x, y;
462
463			assert (w == gdk_pixbuf_get_width (b));
464			assert (h == gdk_pixbuf_get_height (b));
465
466			assert (gdk_pixbuf_get_n_channels (a) == 3);
467			assert (gdk_pixbuf_get_n_channels (b) == 3);
468
469			double diff = 0.;
470			int peak = 0;
471
472	root	1.35	if (w && h)
473	root	1.34	for (y = 0; y < h; y++)
474			{
475			guchar pa_ = pa + y sa;
476			guchar pb_ = pb + y sb;
477	root	1.33
478	root	1.34	for (x = 0; x < w; x++)
479			{
480			int d;
481
482			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
483			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
484			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
485			}
486			}
487	root	1.33
488	root	1.46	perlinterp_acquire ();
489
490	root	1.33	EXTEND (SP, 2);
491			PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
492			PUSHs (sv_2mortal (newSVnv (peak / 255.)));
493			}
494
495	root	1.6	#############################################################################
496
497	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
498
499	root	1.41	# currently only works for filenames (octet strings)
500
501	root	1.18	SV *
502			foldcase (SV *pathsv)
503			PROTOTYPE: $
504			CODE:
505			{
506			STRLEN plen;
507	root	1.41	U8 path = (U8 )SvPV (pathsv, plen);
508	root	1.18	U8 *pend = path + plen;
509			U8 dst [plen * 6 * 3], *dstp = dst;
510
511			while (path < pend)
512			{
513	root	1.19	U8 ch = *path;
514
515			if (ch >= 'a' && ch <= 'z')
516			dstp++ = path++;
517	root	1.41	else if (ch >= 'A' && ch <= 'Z')
518			dstp++ = path++ + ('a' - 'A');
519	root	1.19	else if (ch >= '0' && ch <= '9')
520	root	1.18	{
521			STRLEN el, nl = 0;
522	root	1.19	while (path >= '0' && path <= '9' && path < pend)
523	root	1.18	path++, nl++;
524
525			for (el = nl; el < 6; el++)
526			*dstp++ = '0';
527
528			memcpy (dstp, path - nl, nl);
529			dstp += nl;
530			}
531			else
532	root	1.41	dstp++ = path++;
533			#if 0
534			else
535	root	1.18	{
536			STRLEN cl;
537			to_utf8_fold (path, dstp, &cl);
538			dstp += cl;
539			path += is_utf8_char (path);
540			}
541	root	1.41	#endif
542	root	1.18	}
543
544	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
545	root	1.18	}
546			OUTPUT:
547			RETVAL
548
549	root	1.3	GdkPixbuf_noinc *
550	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
551	root	1.21	PROTOTYPE: @
552	root	1.2	CODE:
553			{
554			int x, y;
555			guchar dst, d;
556			int dstr;
557	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
558	root	1.2
559			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
560			dst = gdk_pixbuf_get_pixels (RETVAL);
561			dstr = gdk_pixbuf_get_rowstride (RETVAL);
562
563			for (y = 0; y < h; y++)
564			for (d = dst + y * dstr, x = 0; x < w; x++)
565			{
566	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
567			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
568			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
569	root	1.2
570			src++;
571			}
572	root	1.3	}
573			OUTPUT:
574			RETVAL
575
576	root	1.6	#############################################################################
577	root	1.4
578			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
579
580			void
581	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
582	root	1.4	CODE:
583			{
584			int w = gdk_pixbuf_get_width (pb);
585			int h = gdk_pixbuf_get_height (pb);
586			int x, y, i;
587			guchar *dst;
588	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
589	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
590			int sstr = gdk_pixbuf_get_rowstride (pb);
591
592			a85_init ();
593
594			for (y = 0; y < h; y++)
595			for (x = 0; x < w; x++)
596	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
597	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
598
599			a85_finish (fp);
600	root	1.7	}
601
602			void
603			dump_binary (PerlIO fp, GdkPixbuf pb)
604			CODE:
605			{
606			int w = gdk_pixbuf_get_width (pb);
607			int h = gdk_pixbuf_get_height (pb);
608			int x, y, i;
609			guchar *dst;
610			int bpp = gdk_pixbuf_get_n_channels (pb);
611			guchar *src = gdk_pixbuf_get_pixels (pb);
612			int sstr = gdk_pixbuf_get_rowstride (pb);
613
614			for (y = 0; y < h; y++)
615			for (x = 0; x < w; x++)
616			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
617			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
618	root	1.4	}
619	root	1.8
620			#############################################################################
621
622			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
623
624			SV *
625			pb_to_hv84 (GdkPixbuf *pb)
626			CODE:
627			{
628			int w = gdk_pixbuf_get_width (pb);
629			int h = gdk_pixbuf_get_height (pb);
630			int x, y;
631			guchar *dst;
632			int bpp = gdk_pixbuf_get_n_channels (pb);
633			guchar *src = gdk_pixbuf_get_pixels (pb);
634			int sstr = gdk_pixbuf_get_rowstride (pb);
635
636			RETVAL = newSV (6 * 8 * 12 / 8);
637			SvPOK_only (RETVAL);
638			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
639
640	root	1.25	dst = (guchar *)SvPVX (RETVAL);
641	root	1.8
642			/* some primitive error distribution + random dithering */
643
644			for (y = 0; y < h; y++)
645			{
646			guchar p = src + y sstr;
647
648			for (x = 0; x < w; x += 2)
649			{
650			unsigned int r, g, b, h, s, v, H, V1, V2;
651
652			if (bpp == 3)
653			r = p++, g = p++, b = *p++;
654			else if (bpp == 1)
655			r = g = b = *p++;
656			else
657			abort ();
658
659			rgb_to_hsv (r, g, b, &h, &s, &v);
660
661			H = (h * 15 / 255) << 4;
662			V1 = v;
663
664			if (bpp == 3)
665			r = p++, g = p++, b = *p++;
666			else if (bpp == 1)
667			r = g = b = *p++;
668			else
669			abort ();
670
671			rgb_to_hsv (r, g, b, &h, &s, &v);
672
673			H \|= h * 15 / 255;
674			V2 = v;
675
676			*dst++ = H;
677			*dst++ = V1;
678			*dst++ = V2;
679			}
680			}
681			}
682			OUTPUT:
683			RETVAL
684	root	1.4
685	root	1.9	SV *
686			hv84_to_av (unsigned char *hv84)
687			CODE:
688			{
689			int i = 72 / 3;
690			AV *av = newAV ();
691
692			RETVAL = (SV )newRV_noinc ((SV )av);
693			while (i--)
694			{
695			int h = *hv84++;
696			int v1 = *hv84++;
697			int v2 = *hv84++;
698
699			av_push (av, newSViv (v1));
700			av_push (av, newSViv ((h >> 4) * 255 / 15));
701			av_push (av, newSViv (v2));
702			av_push (av, newSViv ((h & 15) * 255 / 15));
703			}
704			}
705			OUTPUT:
706			RETVAL
707	root	1.2
708	root	1.20	#############################################################################
709
710			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
711
712			SV *
713	root	1.36	extract_features (SV *ar)
714			CODE:
715			{
716			int i;
717			AV av, result;
718
719			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
720	root	1.39	croak ("Not an array ref as first argument to extract_features");
721	root	1.36
722			av = (AV *) SvRV (ar);
723			result = newAV ();
724
725			for (i = 0; i <= av_len (av); ++i)
726			{
727			SV sv = av_fetch (av, i, 1);
728			SV histsv = newSV (9 sizeof (float) + 1);
729
730			SvPOK_on (histsv);
731			SvCUR_set (histsv, 9 * sizeof (float));
732			float hist = (float )SvPVX (histsv);
733
734			struct feature f_h, f_s, f_v;
735			feature_init (&f_h);
736			feature_init (&f_s);
737			feature_init (&f_v);
738
739			{
740			STRLEN len;
741			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
742			while (len >= 3)
743			{
744			unsigned int r, g, b, h, s, v;
745			r = buf++; g = buf++; b = *buf++;
746			rgb_to_hsv (r, g, b, &h, &s, &v);
747
748			feature_update_pass_1 (&f_h, h);
749			feature_update_pass_1 (&f_s, s);
750			feature_update_pass_1 (&f_v, v);
751
752			len -= 3;
753			}
754
755			feature_finish_pass_1 (&f_h);
756			feature_finish_pass_1 (&f_s);
757			feature_finish_pass_1 (&f_v);
758			}
759
760			{
761			STRLEN len;
762			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
763			while (len >= 3)
764			{
765			unsigned int r, g, b, h, s, v;
766			r = buf++; g = buf++; b = *buf++;
767			rgb_to_hsv (r, g, b, &h, &s, &v);
768
769			feature_update_pass_2 (&f_h, h);
770			feature_update_pass_2 (&f_s, s);
771			feature_update_pass_2 (&f_v, v);
772
773			len -= 3;
774			}
775
776			feature_finish_pass_2 (&f_h);
777			feature_finish_pass_2 (&f_s);
778			feature_finish_pass_2 (&f_v);
779			}
780
781			hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
782			hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ;
783	root	1.38	hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;
784	root	1.36
785			av_push (result, histsv);
786			}
787
788			RETVAL = newRV_noinc ((SV *)result);
789			}
790			OUTPUT:
791			RETVAL
792