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)
{
  longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
}

static void
cv_error_output (j_common_ptr cinfo)
{
  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)
        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);
              }
          }

        pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 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);

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

        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);
          }

        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:	1.46
Committed:	Sat Jul 4 05:31:17 2015 UTC (8 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.45:	+15 -0 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			longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
44			}
45
46			static void
47			cv_error_output (j_common_ptr cinfo)
48			{
49			return;
50			}
51
52			static void
53			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
54			unsigned int h, unsigned int s, unsigned int *v)
55			{
56			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
57			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
58			unsigned int delta = mx - mn;
59
60			*v = mx;
61
62			s = mx ? delta 255 / mx : 0;
63
64			if (delta == 0)
65			*h = 0;
66			else
67			{
68			if (r == mx)
69			h = ((int)g - (int)b) 255 / (int)(delta * 3);
70			else if (g == mx)
71			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
72			else if (b == mx)
73			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
74
75			*h &= 255;
76			}
77			}
78
79	root	1.36	struct feature {
80			float v1, v2, v3; // mean, square, cube
81			int n;
82			};
83
84			static void
85			feature_init (struct feature *f)
86			{
87			f->v1 = 0.;
88			f->v2 = 0.;
89			f->v3 = 0.;
90			f->n = 0;
91			}
92
93			// didn't find an algorithm to neatly do mean, variance and skew in one pass.
94			// elmex ist schuld.
95			static void
96			feature_update_pass_1 (struct feature *f, unsigned int v)
97			{
98			f->v1 += v;
99			f->n += 1;
100			}
101
102			static void
103			feature_finish_pass_1 (struct feature *f)
104			{
105			if (f->n < 1)
106			return;
107
108			f->v1 /= f->n;
109			}
110
111			static void
112			feature_update_pass_2 (struct feature *f, unsigned int v)
113			{
114			float d = v - f->v1;
115
116			f->v2 += d * d;
117			f->v3 += d * d * d;
118			}
119
120			static void
121			feature_finish_pass_2 (struct feature *f)
122			{
123			if (f->n < 1)
124			return;
125
126			f->v2 /= f->n;
127			f->v3 /= f->n;
128
129			f->v1 /= 255.;
130	root	1.37	f->v2 /= 255. * 255.; f->v2 = sqrtf (f->v2);
131			f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
132	root	1.36	}
133
134	root	1.4	static guint32 a85_val;
135			static guint a85_cnt;
136	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
137	root	1.4
138			static void
139			a85_init (void)
140			{
141			a85_cnt = 4;
142			a85_ptr = a85_buf;
143			}
144
145			static void
146			a85_push (PerlIO *fp, guchar c)
147			{
148			a85_val = a85_val << 8 \| c;
149
150			if (!--a85_cnt)
151			{
152			a85_cnt = 4;
153			if (a85_val)
154			{
155			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
156			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
157			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
158			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
159			a85_ptr[0] = (a85_val ) + 33;
160
161			a85_ptr += 5;
162			}
163			else
164			*a85_ptr++ = 'z';
165
166			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
167			{
168			*a85_ptr++ = '\n';
169			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
170			a85_ptr = a85_buf;
171			}
172			}
173
174			}
175
176	root	1.8	static void
177	root	1.4	a85_finish (PerlIO *fp)
178			{
179			while (a85_cnt != 4)
180			a85_push (fp, 0);
181
182			*a85_ptr++ = '~'; // probably buggy end-marker
183			*a85_ptr++ = '>'; // probably buggy end-marker
184			*a85_ptr++ = '\n';
185
186			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
187			}
188
189	root	1.6	/////////////////////////////////////////////////////////////////////////////
190
191	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
192	root	1.1
193			PROTOTYPES: ENABLE
194	root	1.2
195	root	1.29	# missing function in perl. really :)
196			int
197			common_prefix_length (a, b)
198			unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
199			unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
200			CODE:
201			RETVAL = 0;
202
203			while (a == b && *a)
204			{
205			RETVAL += (*a & 0xc0) != 0x80;
206			a++, b++;
207			}
208
209			OUTPUT:
210			RETVAL
211
212	root	1.31	const char *
213	root	1.42	magic (octet_string path)
214	root	1.31	CODE:
215			{
216			static magic_t cookie;
217
218			if (!cookie)
219			{
220	root	1.45	cookie = magic_open (MAGIC_SYMLINK);
221	root	1.32
222			if (cookie)
223			magic_load (cookie, 0);
224			else
225			XSRETURN_UNDEF;
226			}
227
228			RETVAL = magic_file (cookie, path);
229			}
230			OUTPUT:
231			RETVAL
232
233			const char *
234	root	1.42	magic_mime (octet_string path)
235	root	1.32	CODE:
236			{
237			static magic_t cookie;
238
239			if (!cookie)
240			{
241	root	1.45	cookie = magic_open (MAGIC_MIME \| MAGIC_SYMLINK);
242	root	1.31
243			if (cookie)
244			magic_load (cookie, 0);
245			else
246			XSRETURN_UNDEF;
247			}
248
249	root	1.46	perlinterp_release ();
250	root	1.31	RETVAL = magic_file (cookie, path);
251	root	1.46	perlinterp_acquire ();
252	root	1.31	}
253			OUTPUT:
254			RETVAL
255
256	root	1.40	# missing/broken in Gtk2 perl module
257
258			void
259			gdk_window_clear_hints (GdkWindow *window)
260			CODE:
261			gdk_window_set_geometry_hints (window, 0, 0);
262	root	1.22
263			gboolean
264			gdk_net_wm_supports (GdkAtom property)
265			CODE:
266			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
267			RETVAL = gdk_net_wm_supports (property);
268			#else
269			RETVAL = 0;
270			#endif
271			OUTPUT:
272			RETVAL
273
274	root	1.3	GdkPixbuf_noinc *
275	root	1.26	dealpha_expose (GdkPixbuf *pb)
276			CODE:
277	root	1.46	perlinterp_release ();
278	root	1.26	{
279			int w = gdk_pixbuf_get_width (pb);
280			int h = gdk_pixbuf_get_height (pb);
281			int bpp = gdk_pixbuf_get_n_channels (pb);
282			int x, y, i;
283			guchar src = gdk_pixbuf_get_pixels (pb), dst;
284			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
285
286			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
287
288			dst = gdk_pixbuf_get_pixels (RETVAL);
289			dstr = gdk_pixbuf_get_rowstride (RETVAL);
290
291			for (x = 0; x < w; x++)
292			for (y = 0; y < h; y++)
293			for (i = 0; i < 3; i++)
294			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
295			}
296	root	1.46	perlinterp_acquire ();
297	root	1.26	OUTPUT:
298			RETVAL
299
300			GdkPixbuf_noinc *
301	root	1.28	rotate (GdkPixbuf *pb, int angle)
302	root	1.2	CODE:
303	root	1.46	perlinterp_release ();
304	root	1.44	if (angle < 0)
305			angle += 360;
306	root	1.28	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
307			: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
308			: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
309			: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
310			: angle);
311	root	1.46	perlinterp_acquire ();
312	root	1.2	OUTPUT:
313			RETVAL
314
315	root	1.17	GdkPixbuf_noinc *
316	root	1.23	load_jpeg (SV *path, int thumbnail=0)
317	root	1.17	CODE:
318			{
319			struct jpeg_decompress_struct cinfo;
320			struct jpg_err_mgr jerr;
321			guchar *data;
322			int rs;
323			FILE *fp;
324			volatile GdkPixbuf *pb = 0;
325	root	1.23
326	root	1.17	RETVAL = 0;
327
328	root	1.30	fp = fopen (SvPVbyte_nolen (path), "rb");
329	root	1.23
330			if (!fp)
331	root	1.17	XSRETURN_UNDEF;
332
333	root	1.46	perlinterp_release ();
334
335	root	1.17	cinfo.err = jpeg_std_error (&jerr.err);
336
337			jerr.err.error_exit = cv_error_exit;
338			jerr.err.output_message = cv_error_output;
339
340			if ((rs = setjmp (jerr.setjmp_buffer)))
341			{
342			fclose (fp);
343			jpeg_destroy_decompress (&cinfo);
344
345			if (pb)
346			g_object_unref ((gpointer)pb);
347
348	root	1.46	perlinterp_acquire ();
349	root	1.17	XSRETURN_UNDEF;
350			}
351
352			jpeg_create_decompress (&cinfo);
353
354			jpeg_stdio_src (&cinfo, fp);
355			jpeg_read_header (&cinfo, TRUE);
356
357			cinfo.dct_method = JDCT_DEFAULT;
358			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
359			cinfo.do_block_smoothing = FALSE;
360			cinfo.out_color_space = JCS_RGB;
361			cinfo.quantize_colors = FALSE;
362
363			cinfo.scale_num = 1;
364			cinfo.scale_denom = 1;
365
366			jpeg_calc_output_dimensions (&cinfo);
367
368			if (thumbnail)
369			{
370			cinfo.dct_method = JDCT_FASTEST;
371			cinfo.do_fancy_upsampling = FALSE;
372
373			while (cinfo.scale_denom < 8
374	root	1.21	&& cinfo.output_width >= IW*4
375			&& cinfo.output_height >= IH*4)
376	root	1.17	{
377			cinfo.scale_denom <<= 1;
378			jpeg_calc_output_dimensions (&cinfo);
379			}
380			}
381
382			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
383			if (!RETVAL)
384			longjmp (jerr.setjmp_buffer, 2);
385
386			data = gdk_pixbuf_get_pixels (RETVAL);
387			rs = gdk_pixbuf_get_rowstride (RETVAL);
388
389			if (cinfo.output_components != 3)
390			longjmp (jerr.setjmp_buffer, 3);
391
392			jpeg_start_decompress (&cinfo);
393
394			while (cinfo.output_scanline < cinfo.output_height)
395			{
396			int remaining = cinfo.output_height - cinfo.output_scanline;
397			JSAMPROW rp[4];
398
399			rp [0] = data + cinfo.output_scanline * rs;
400			rp [1] = (guchar *)rp [0] + rs;
401			rp [2] = (guchar *)rp [1] + rs;
402			rp [3] = (guchar *)rp [2] + rs;
403
404			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
405			}
406
407			jpeg_finish_decompress (&cinfo);
408			fclose (fp);
409			jpeg_destroy_decompress (&cinfo);
410	root	1.46	perlinterp_acquire ();
411	root	1.17	}
412			OUTPUT:
413			RETVAL
414
415	root	1.33	void
416			compare (GdkPixbuf a, GdkPixbuf b)
417			PPCODE:
418	root	1.46	perlinterp_release ();
419	root	1.33	{
420			int w = gdk_pixbuf_get_width (a);
421			int h = gdk_pixbuf_get_height (a);
422	root	1.43
423	root	1.33	int sa = gdk_pixbuf_get_rowstride (a);
424			int sb = gdk_pixbuf_get_rowstride (b);
425
426			guchar *pa = gdk_pixbuf_get_pixels (a);
427			guchar *pb = gdk_pixbuf_get_pixels (b);
428
429			int x, y;
430
431			assert (w == gdk_pixbuf_get_width (b));
432			assert (h == gdk_pixbuf_get_height (b));
433
434			assert (gdk_pixbuf_get_n_channels (a) == 3);
435			assert (gdk_pixbuf_get_n_channels (b) == 3);
436
437			double diff = 0.;
438			int peak = 0;
439
440	root	1.35	if (w && h)
441	root	1.34	for (y = 0; y < h; y++)
442			{
443			guchar pa_ = pa + y sa;
444			guchar pb_ = pb + y sb;
445	root	1.33
446	root	1.34	for (x = 0; x < w; x++)
447			{
448			int d;
449
450			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
451			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
452			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
453			}
454			}
455	root	1.33
456	root	1.46	perlinterp_acquire ();
457
458	root	1.33	EXTEND (SP, 2);
459			PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
460			PUSHs (sv_2mortal (newSVnv (peak / 255.)));
461			}
462
463	root	1.6	#############################################################################
464
465	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
466
467	root	1.41	# currently only works for filenames (octet strings)
468
469	root	1.18	SV *
470			foldcase (SV *pathsv)
471			PROTOTYPE: $
472			CODE:
473			{
474			STRLEN plen;
475	root	1.41	U8 path = (U8 )SvPV (pathsv, plen);
476	root	1.18	U8 *pend = path + plen;
477			U8 dst [plen * 6 * 3], *dstp = dst;
478
479			while (path < pend)
480			{
481	root	1.19	U8 ch = *path;
482
483			if (ch >= 'a' && ch <= 'z')
484			dstp++ = path++;
485	root	1.41	else if (ch >= 'A' && ch <= 'Z')
486			dstp++ = path++ + ('a' - 'A');
487	root	1.19	else if (ch >= '0' && ch <= '9')
488	root	1.18	{
489			STRLEN el, nl = 0;
490	root	1.19	while (path >= '0' && path <= '9' && path < pend)
491	root	1.18	path++, nl++;
492
493			for (el = nl; el < 6; el++)
494			*dstp++ = '0';
495
496			memcpy (dstp, path - nl, nl);
497			dstp += nl;
498			}
499			else
500	root	1.41	dstp++ = path++;
501			#if 0
502			else
503	root	1.18	{
504			STRLEN cl;
505			to_utf8_fold (path, dstp, &cl);
506			dstp += cl;
507			path += is_utf8_char (path);
508			}
509	root	1.41	#endif
510	root	1.18	}
511
512	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
513	root	1.18	}
514			OUTPUT:
515			RETVAL
516
517	root	1.3	GdkPixbuf_noinc *
518	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
519	root	1.21	PROTOTYPE: @
520	root	1.2	CODE:
521			{
522			int x, y;
523			guchar dst, d;
524			int dstr;
525	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
526	root	1.2
527			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
528			dst = gdk_pixbuf_get_pixels (RETVAL);
529			dstr = gdk_pixbuf_get_rowstride (RETVAL);
530
531			for (y = 0; y < h; y++)
532			for (d = dst + y * dstr, x = 0; x < w; x++)
533			{
534	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
535			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
536			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
537	root	1.2
538			src++;
539			}
540	root	1.3	}
541			OUTPUT:
542			RETVAL
543
544	root	1.6	#############################################################################
545	root	1.4
546			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
547
548			void
549	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
550	root	1.4	CODE:
551			{
552			int w = gdk_pixbuf_get_width (pb);
553			int h = gdk_pixbuf_get_height (pb);
554			int x, y, i;
555			guchar *dst;
556	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
557	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
558			int sstr = gdk_pixbuf_get_rowstride (pb);
559
560			a85_init ();
561
562			for (y = 0; y < h; y++)
563			for (x = 0; x < w; x++)
564	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
565	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
566
567			a85_finish (fp);
568	root	1.7	}
569
570			void
571			dump_binary (PerlIO fp, GdkPixbuf pb)
572			CODE:
573			{
574			int w = gdk_pixbuf_get_width (pb);
575			int h = gdk_pixbuf_get_height (pb);
576			int x, y, i;
577			guchar *dst;
578			int bpp = gdk_pixbuf_get_n_channels (pb);
579			guchar *src = gdk_pixbuf_get_pixels (pb);
580			int sstr = gdk_pixbuf_get_rowstride (pb);
581
582			for (y = 0; y < h; y++)
583			for (x = 0; x < w; x++)
584			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
585			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
586	root	1.4	}
587	root	1.8
588			#############################################################################
589
590			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
591
592			SV *
593			pb_to_hv84 (GdkPixbuf *pb)
594			CODE:
595			{
596			int w = gdk_pixbuf_get_width (pb);
597			int h = gdk_pixbuf_get_height (pb);
598			int x, y;
599			guchar *dst;
600			int bpp = gdk_pixbuf_get_n_channels (pb);
601			guchar *src = gdk_pixbuf_get_pixels (pb);
602			int sstr = gdk_pixbuf_get_rowstride (pb);
603
604			RETVAL = newSV (6 * 8 * 12 / 8);
605			SvPOK_only (RETVAL);
606			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
607
608	root	1.25	dst = (guchar *)SvPVX (RETVAL);
609	root	1.8
610			/* some primitive error distribution + random dithering */
611
612			for (y = 0; y < h; y++)
613			{
614			guchar p = src + y sstr;
615
616			for (x = 0; x < w; x += 2)
617			{
618			unsigned int r, g, b, h, s, v, H, V1, V2;
619
620			if (bpp == 3)
621			r = p++, g = p++, b = *p++;
622			else if (bpp == 1)
623			r = g = b = *p++;
624			else
625			abort ();
626
627			rgb_to_hsv (r, g, b, &h, &s, &v);
628
629			H = (h * 15 / 255) << 4;
630			V1 = v;
631
632			if (bpp == 3)
633			r = p++, g = p++, b = *p++;
634			else if (bpp == 1)
635			r = g = b = *p++;
636			else
637			abort ();
638
639			rgb_to_hsv (r, g, b, &h, &s, &v);
640
641			H \|= h * 15 / 255;
642			V2 = v;
643
644			*dst++ = H;
645			*dst++ = V1;
646			*dst++ = V2;
647			}
648			}
649			}
650			OUTPUT:
651			RETVAL
652	root	1.4
653	root	1.9	SV *
654			hv84_to_av (unsigned char *hv84)
655			CODE:
656			{
657			int i = 72 / 3;
658			AV *av = newAV ();
659
660			RETVAL = (SV )newRV_noinc ((SV )av);
661			while (i--)
662			{
663			int h = *hv84++;
664			int v1 = *hv84++;
665			int v2 = *hv84++;
666
667			av_push (av, newSViv (v1));
668			av_push (av, newSViv ((h >> 4) * 255 / 15));
669			av_push (av, newSViv (v2));
670			av_push (av, newSViv ((h & 15) * 255 / 15));
671			}
672			}
673			OUTPUT:
674			RETVAL
675	root	1.2
676	root	1.20	#############################################################################
677
678			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
679
680			SV *
681	root	1.36	extract_features (SV *ar)
682			CODE:
683			{
684			int i;
685			AV av, result;
686
687			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
688	root	1.39	croak ("Not an array ref as first argument to extract_features");
689	root	1.36
690			av = (AV *) SvRV (ar);
691			result = newAV ();
692
693			for (i = 0; i <= av_len (av); ++i)
694			{
695			SV sv = av_fetch (av, i, 1);
696			SV histsv = newSV (9 sizeof (float) + 1);
697
698			SvPOK_on (histsv);
699			SvCUR_set (histsv, 9 * sizeof (float));
700			float hist = (float )SvPVX (histsv);
701
702			struct feature f_h, f_s, f_v;
703			feature_init (&f_h);
704			feature_init (&f_s);
705			feature_init (&f_v);
706
707			{
708			STRLEN len;
709			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
710			while (len >= 3)
711			{
712			unsigned int r, g, b, h, s, v;
713			r = buf++; g = buf++; b = *buf++;
714			rgb_to_hsv (r, g, b, &h, &s, &v);
715
716			feature_update_pass_1 (&f_h, h);
717			feature_update_pass_1 (&f_s, s);
718			feature_update_pass_1 (&f_v, v);
719
720			len -= 3;
721			}
722
723			feature_finish_pass_1 (&f_h);
724			feature_finish_pass_1 (&f_s);
725			feature_finish_pass_1 (&f_v);
726			}
727
728			{
729			STRLEN len;
730			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
731			while (len >= 3)
732			{
733			unsigned int r, g, b, h, s, v;
734			r = buf++; g = buf++; b = *buf++;
735			rgb_to_hsv (r, g, b, &h, &s, &v);
736
737			feature_update_pass_2 (&f_h, h);
738			feature_update_pass_2 (&f_s, s);
739			feature_update_pass_2 (&f_v, v);
740
741			len -= 3;
742			}
743
744			feature_finish_pass_2 (&f_h);
745			feature_finish_pass_2 (&f_s);
746			feature_finish_pass_2 (&f_v);
747			}
748
749			hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
750			hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ;
751	root	1.38	hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;
752	root	1.36
753			av_push (result, histsv);
754			}
755
756			RETVAL = newRV_noinc ((SV *)result);
757			}
758			OUTPUT:
759			RETVAL
760