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>

#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_NONE);

            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);

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

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

GdkPixbuf_noinc *
rotate (GdkPixbuf *pb, int angle)
        CODE:
        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);
        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;

        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);

            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);
}
        OUTPUT:
        RETVAL

void
compare (GdkPixbuf *a, GdkPixbuf *b)
        PPCODE:
{
        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));
                }
            }

        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:	1.44
Committed:	Sun Dec 30 16:23:23 2012 UTC (11 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.43:	+2 -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	1.33	#define IW 80 /* MUST match Schnauzer.pm! */
22			#define IH 60 /* MUST match Schnauzer.pm! */
23	root	1.5
24			#define RAND (seed = (seed + 7141) * 54773 % 134456)
25
26	root	1.7	#define LINELENGTH 240
27
28	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
29
30	root	1.42	typedef char *octet_string;
31
32	root	1.17	struct jpg_err_mgr
33			{
34			struct jpeg_error_mgr err;
35			jmp_buf setjmp_buffer;
36			};
37
38			static void
39			cv_error_exit (j_common_ptr cinfo)
40			{
41			longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
42			}
43
44			static void
45			cv_error_output (j_common_ptr cinfo)
46			{
47			return;
48			}
49
50			static void
51			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
52			unsigned int h, unsigned int s, unsigned int *v)
53			{
54			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
55			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
56			unsigned int delta = mx - mn;
57
58			*v = mx;
59
60			s = mx ? delta 255 / mx : 0;
61
62			if (delta == 0)
63			*h = 0;
64			else
65			{
66			if (r == mx)
67			h = ((int)g - (int)b) 255 / (int)(delta * 3);
68			else if (g == mx)
69			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
70			else if (b == mx)
71			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
72
73			*h &= 255;
74			}
75			}
76
77	root	1.36	struct feature {
78			float v1, v2, v3; // mean, square, cube
79			int n;
80			};
81
82			static void
83			feature_init (struct feature *f)
84			{
85			f->v1 = 0.;
86			f->v2 = 0.;
87			f->v3 = 0.;
88			f->n = 0;
89			}
90
91			// didn't find an algorithm to neatly do mean, variance and skew in one pass.
92			// elmex ist schuld.
93			static void
94			feature_update_pass_1 (struct feature *f, unsigned int v)
95			{
96			f->v1 += v;
97			f->n += 1;
98			}
99
100			static void
101			feature_finish_pass_1 (struct feature *f)
102			{
103			if (f->n < 1)
104			return;
105
106			f->v1 /= f->n;
107			}
108
109			static void
110			feature_update_pass_2 (struct feature *f, unsigned int v)
111			{
112			float d = v - f->v1;
113
114			f->v2 += d * d;
115			f->v3 += d * d * d;
116			}
117
118			static void
119			feature_finish_pass_2 (struct feature *f)
120			{
121			if (f->n < 1)
122			return;
123
124			f->v2 /= f->n;
125			f->v3 /= f->n;
126
127			f->v1 /= 255.;
128	root	1.37	f->v2 /= 255. * 255.; f->v2 = sqrtf (f->v2);
129			f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
130	root	1.36	}
131
132	root	1.4	static guint32 a85_val;
133			static guint a85_cnt;
134	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
135	root	1.4
136			static void
137			a85_init (void)
138			{
139			a85_cnt = 4;
140			a85_ptr = a85_buf;
141			}
142
143			static void
144			a85_push (PerlIO *fp, guchar c)
145			{
146			a85_val = a85_val << 8 \| c;
147
148			if (!--a85_cnt)
149			{
150			a85_cnt = 4;
151			if (a85_val)
152			{
153			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
154			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
155			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
156			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
157			a85_ptr[0] = (a85_val ) + 33;
158
159			a85_ptr += 5;
160			}
161			else
162			*a85_ptr++ = 'z';
163
164			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
165			{
166			*a85_ptr++ = '\n';
167			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
168			a85_ptr = a85_buf;
169			}
170			}
171
172			}
173
174	root	1.8	static void
175	root	1.4	a85_finish (PerlIO *fp)
176			{
177			while (a85_cnt != 4)
178			a85_push (fp, 0);
179
180			*a85_ptr++ = '~'; // probably buggy end-marker
181			*a85_ptr++ = '>'; // probably buggy end-marker
182			*a85_ptr++ = '\n';
183
184			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
185			}
186
187	root	1.6	/////////////////////////////////////////////////////////////////////////////
188
189	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
190	root	1.1
191			PROTOTYPES: ENABLE
192	root	1.2
193	root	1.29	# missing function in perl. really :)
194			int
195			common_prefix_length (a, b)
196			unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
197			unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
198			CODE:
199			RETVAL = 0;
200
201			while (a == b && *a)
202			{
203			RETVAL += (*a & 0xc0) != 0x80;
204			a++, b++;
205			}
206
207			OUTPUT:
208			RETVAL
209
210	root	1.31	const char *
211	root	1.42	magic (octet_string path)
212	root	1.31	CODE:
213			{
214			static magic_t cookie;
215
216			if (!cookie)
217			{
218	root	1.32	cookie = magic_open (MAGIC_NONE);
219
220			if (cookie)
221			magic_load (cookie, 0);
222			else
223			XSRETURN_UNDEF;
224			}
225
226			RETVAL = magic_file (cookie, path);
227			}
228			OUTPUT:
229			RETVAL
230
231			const char *
232	root	1.42	magic_mime (octet_string path)
233	root	1.32	CODE:
234			{
235			static magic_t cookie;
236
237			if (!cookie)
238			{
239	root	1.31	cookie = magic_open (MAGIC_MIME);
240
241			if (cookie)
242			magic_load (cookie, 0);
243			else
244			XSRETURN_UNDEF;
245			}
246
247			RETVAL = magic_file (cookie, path);
248			}
249			OUTPUT:
250			RETVAL
251
252	root	1.40	# missing/broken in Gtk2 perl module
253
254			void
255			gdk_window_clear_hints (GdkWindow *window)
256			CODE:
257			gdk_window_set_geometry_hints (window, 0, 0);
258	root	1.22
259			gboolean
260			gdk_net_wm_supports (GdkAtom property)
261			CODE:
262			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
263			RETVAL = gdk_net_wm_supports (property);
264			#else
265			RETVAL = 0;
266			#endif
267			OUTPUT:
268			RETVAL
269
270	root	1.3	GdkPixbuf_noinc *
271	root	1.26	dealpha_expose (GdkPixbuf *pb)
272			CODE:
273			{
274			int w = gdk_pixbuf_get_width (pb);
275			int h = gdk_pixbuf_get_height (pb);
276			int bpp = gdk_pixbuf_get_n_channels (pb);
277			int x, y, i;
278			guchar src = gdk_pixbuf_get_pixels (pb), dst;
279			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
280
281			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
282
283			dst = gdk_pixbuf_get_pixels (RETVAL);
284			dstr = gdk_pixbuf_get_rowstride (RETVAL);
285
286			for (x = 0; x < w; x++)
287			for (y = 0; y < h; y++)
288			for (i = 0; i < 3; i++)
289			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
290			}
291			OUTPUT:
292			RETVAL
293
294			GdkPixbuf_noinc *
295	root	1.28	rotate (GdkPixbuf *pb, int angle)
296	root	1.2	CODE:
297	root	1.44	if (angle < 0)
298			angle += 360;
299	root	1.28	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
300			: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
301			: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
302			: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
303			: angle);
304	root	1.2	OUTPUT:
305			RETVAL
306
307	root	1.17	GdkPixbuf_noinc *
308	root	1.23	load_jpeg (SV *path, int thumbnail=0)
309	root	1.17	CODE:
310			{
311			struct jpeg_decompress_struct cinfo;
312			struct jpg_err_mgr jerr;
313			guchar *data;
314			int rs;
315			FILE *fp;
316			volatile GdkPixbuf *pb = 0;
317	root	1.23
318	root	1.17	RETVAL = 0;
319
320	root	1.30	fp = fopen (SvPVbyte_nolen (path), "rb");
321	root	1.23
322			if (!fp)
323	root	1.17	XSRETURN_UNDEF;
324
325			cinfo.err = jpeg_std_error (&jerr.err);
326
327			jerr.err.error_exit = cv_error_exit;
328			jerr.err.output_message = cv_error_output;
329
330			if ((rs = setjmp (jerr.setjmp_buffer)))
331			{
332			fclose (fp);
333			jpeg_destroy_decompress (&cinfo);
334
335			if (pb)
336			g_object_unref ((gpointer)pb);
337
338			XSRETURN_UNDEF;
339			}
340
341			jpeg_create_decompress (&cinfo);
342
343			jpeg_stdio_src (&cinfo, fp);
344			jpeg_read_header (&cinfo, TRUE);
345
346			cinfo.dct_method = JDCT_DEFAULT;
347			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
348			cinfo.do_block_smoothing = FALSE;
349			cinfo.out_color_space = JCS_RGB;
350			cinfo.quantize_colors = FALSE;
351
352			cinfo.scale_num = 1;
353			cinfo.scale_denom = 1;
354
355			jpeg_calc_output_dimensions (&cinfo);
356
357			if (thumbnail)
358			{
359			cinfo.dct_method = JDCT_FASTEST;
360			cinfo.do_fancy_upsampling = FALSE;
361
362			while (cinfo.scale_denom < 8
363	root	1.21	&& cinfo.output_width >= IW*4
364			&& cinfo.output_height >= IH*4)
365	root	1.17	{
366			cinfo.scale_denom <<= 1;
367			jpeg_calc_output_dimensions (&cinfo);
368			}
369			}
370
371			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
372			if (!RETVAL)
373			longjmp (jerr.setjmp_buffer, 2);
374
375			data = gdk_pixbuf_get_pixels (RETVAL);
376			rs = gdk_pixbuf_get_rowstride (RETVAL);
377
378			if (cinfo.output_components != 3)
379			longjmp (jerr.setjmp_buffer, 3);
380
381			jpeg_start_decompress (&cinfo);
382
383			while (cinfo.output_scanline < cinfo.output_height)
384			{
385			int remaining = cinfo.output_height - cinfo.output_scanline;
386			JSAMPROW rp[4];
387
388			rp [0] = data + cinfo.output_scanline * rs;
389			rp [1] = (guchar *)rp [0] + rs;
390			rp [2] = (guchar *)rp [1] + rs;
391			rp [3] = (guchar *)rp [2] + rs;
392
393			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
394			}
395
396			jpeg_finish_decompress (&cinfo);
397			fclose (fp);
398			jpeg_destroy_decompress (&cinfo);
399			}
400			OUTPUT:
401			RETVAL
402
403	root	1.33	void
404			compare (GdkPixbuf a, GdkPixbuf b)
405			PPCODE:
406			{
407			int w = gdk_pixbuf_get_width (a);
408			int h = gdk_pixbuf_get_height (a);
409	root	1.43
410	root	1.33	int sa = gdk_pixbuf_get_rowstride (a);
411			int sb = gdk_pixbuf_get_rowstride (b);
412
413			guchar *pa = gdk_pixbuf_get_pixels (a);
414			guchar *pb = gdk_pixbuf_get_pixels (b);
415
416			int x, y;
417
418			assert (w == gdk_pixbuf_get_width (b));
419			assert (h == gdk_pixbuf_get_height (b));
420
421			assert (gdk_pixbuf_get_n_channels (a) == 3);
422			assert (gdk_pixbuf_get_n_channels (b) == 3);
423
424			double diff = 0.;
425			int peak = 0;
426
427	root	1.35	if (w && h)
428	root	1.34	for (y = 0; y < h; y++)
429			{
430			guchar pa_ = pa + y sa;
431			guchar pb_ = pb + y sb;
432	root	1.33
433	root	1.34	for (x = 0; x < w; x++)
434			{
435			int d;
436
437			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
438			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
439			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
440			}
441			}
442	root	1.33
443			EXTEND (SP, 2);
444			PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
445			PUSHs (sv_2mortal (newSVnv (peak / 255.)));
446			}
447
448	root	1.6	#############################################################################
449
450	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
451
452	root	1.41	# currently only works for filenames (octet strings)
453
454	root	1.18	SV *
455			foldcase (SV *pathsv)
456			PROTOTYPE: $
457			CODE:
458			{
459			STRLEN plen;
460	root	1.41	U8 path = (U8 )SvPV (pathsv, plen);
461	root	1.18	U8 *pend = path + plen;
462			U8 dst [plen * 6 * 3], *dstp = dst;
463
464			while (path < pend)
465			{
466	root	1.19	U8 ch = *path;
467
468			if (ch >= 'a' && ch <= 'z')
469			dstp++ = path++;
470	root	1.41	else if (ch >= 'A' && ch <= 'Z')
471			dstp++ = path++ + ('a' - 'A');
472	root	1.19	else if (ch >= '0' && ch <= '9')
473	root	1.18	{
474			STRLEN el, nl = 0;
475	root	1.19	while (path >= '0' && path <= '9' && path < pend)
476	root	1.18	path++, nl++;
477
478			for (el = nl; el < 6; el++)
479			*dstp++ = '0';
480
481			memcpy (dstp, path - nl, nl);
482			dstp += nl;
483			}
484			else
485	root	1.41	dstp++ = path++;
486			#if 0
487			else
488	root	1.18	{
489			STRLEN cl;
490			to_utf8_fold (path, dstp, &cl);
491			dstp += cl;
492			path += is_utf8_char (path);
493			}
494	root	1.41	#endif
495	root	1.18	}
496
497	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
498	root	1.18	}
499			OUTPUT:
500			RETVAL
501
502	root	1.3	GdkPixbuf_noinc *
503	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
504	root	1.21	PROTOTYPE: @
505	root	1.2	CODE:
506			{
507			int x, y;
508			guchar dst, d;
509			int dstr;
510	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
511	root	1.2
512			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
513			dst = gdk_pixbuf_get_pixels (RETVAL);
514			dstr = gdk_pixbuf_get_rowstride (RETVAL);
515
516			for (y = 0; y < h; y++)
517			for (d = dst + y * dstr, x = 0; x < w; x++)
518			{
519	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
520			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
521			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
522	root	1.2
523			src++;
524			}
525	root	1.3	}
526			OUTPUT:
527			RETVAL
528
529	root	1.6	#############################################################################
530	root	1.4
531			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
532
533			void
534	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
535	root	1.4	CODE:
536			{
537			int w = gdk_pixbuf_get_width (pb);
538			int h = gdk_pixbuf_get_height (pb);
539			int x, y, i;
540			guchar *dst;
541	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
542	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
543			int sstr = gdk_pixbuf_get_rowstride (pb);
544
545			a85_init ();
546
547			for (y = 0; y < h; y++)
548			for (x = 0; x < w; x++)
549	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
550	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
551
552			a85_finish (fp);
553	root	1.7	}
554
555			void
556			dump_binary (PerlIO fp, GdkPixbuf pb)
557			CODE:
558			{
559			int w = gdk_pixbuf_get_width (pb);
560			int h = gdk_pixbuf_get_height (pb);
561			int x, y, i;
562			guchar *dst;
563			int bpp = gdk_pixbuf_get_n_channels (pb);
564			guchar *src = gdk_pixbuf_get_pixels (pb);
565			int sstr = gdk_pixbuf_get_rowstride (pb);
566
567			for (y = 0; y < h; y++)
568			for (x = 0; x < w; x++)
569			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
570			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
571	root	1.4	}
572	root	1.8
573			#############################################################################
574
575			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
576
577			SV *
578			pb_to_hv84 (GdkPixbuf *pb)
579			CODE:
580			{
581			int w = gdk_pixbuf_get_width (pb);
582			int h = gdk_pixbuf_get_height (pb);
583			int x, y;
584			guchar *dst;
585			int bpp = gdk_pixbuf_get_n_channels (pb);
586			guchar *src = gdk_pixbuf_get_pixels (pb);
587			int sstr = gdk_pixbuf_get_rowstride (pb);
588
589			RETVAL = newSV (6 * 8 * 12 / 8);
590			SvPOK_only (RETVAL);
591			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
592
593	root	1.25	dst = (guchar *)SvPVX (RETVAL);
594	root	1.8
595			/* some primitive error distribution + random dithering */
596
597			for (y = 0; y < h; y++)
598			{
599			guchar p = src + y sstr;
600
601			for (x = 0; x < w; x += 2)
602			{
603			unsigned int r, g, b, h, s, v, H, V1, V2;
604
605			if (bpp == 3)
606			r = p++, g = p++, b = *p++;
607			else if (bpp == 1)
608			r = g = b = *p++;
609			else
610			abort ();
611
612			rgb_to_hsv (r, g, b, &h, &s, &v);
613
614			H = (h * 15 / 255) << 4;
615			V1 = v;
616
617			if (bpp == 3)
618			r = p++, g = p++, b = *p++;
619			else if (bpp == 1)
620			r = g = b = *p++;
621			else
622			abort ();
623
624			rgb_to_hsv (r, g, b, &h, &s, &v);
625
626			H \|= h * 15 / 255;
627			V2 = v;
628
629			*dst++ = H;
630			*dst++ = V1;
631			*dst++ = V2;
632			}
633			}
634			}
635			OUTPUT:
636			RETVAL
637	root	1.4
638	root	1.9	SV *
639			hv84_to_av (unsigned char *hv84)
640			CODE:
641			{
642			int i = 72 / 3;
643			AV *av = newAV ();
644
645			RETVAL = (SV )newRV_noinc ((SV )av);
646			while (i--)
647			{
648			int h = *hv84++;
649			int v1 = *hv84++;
650			int v2 = *hv84++;
651
652			av_push (av, newSViv (v1));
653			av_push (av, newSViv ((h >> 4) * 255 / 15));
654			av_push (av, newSViv (v2));
655			av_push (av, newSViv ((h & 15) * 255 / 15));
656			}
657			}
658			OUTPUT:
659			RETVAL
660	root	1.2
661	root	1.20	#############################################################################
662
663			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
664
665			SV *
666	root	1.36	extract_features (SV *ar)
667			CODE:
668			{
669			int i;
670			AV av, result;
671
672			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
673	root	1.39	croak ("Not an array ref as first argument to extract_features");
674	root	1.36
675			av = (AV *) SvRV (ar);
676			result = newAV ();
677
678			for (i = 0; i <= av_len (av); ++i)
679			{
680			SV sv = av_fetch (av, i, 1);
681			SV histsv = newSV (9 sizeof (float) + 1);
682
683			SvPOK_on (histsv);
684			SvCUR_set (histsv, 9 * sizeof (float));
685			float hist = (float )SvPVX (histsv);
686
687			struct feature f_h, f_s, f_v;
688			feature_init (&f_h);
689			feature_init (&f_s);
690			feature_init (&f_v);
691
692			{
693			STRLEN len;
694			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
695			while (len >= 3)
696			{
697			unsigned int r, g, b, h, s, v;
698			r = buf++; g = buf++; b = *buf++;
699			rgb_to_hsv (r, g, b, &h, &s, &v);
700
701			feature_update_pass_1 (&f_h, h);
702			feature_update_pass_1 (&f_s, s);
703			feature_update_pass_1 (&f_v, v);
704
705			len -= 3;
706			}
707
708			feature_finish_pass_1 (&f_h);
709			feature_finish_pass_1 (&f_s);
710			feature_finish_pass_1 (&f_v);
711			}
712
713			{
714			STRLEN len;
715			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
716			while (len >= 3)
717			{
718			unsigned int r, g, b, h, s, v;
719			r = buf++; g = buf++; b = *buf++;
720			rgb_to_hsv (r, g, b, &h, &s, &v);
721
722			feature_update_pass_2 (&f_h, h);
723			feature_update_pass_2 (&f_s, s);
724			feature_update_pass_2 (&f_v, v);
725
726			len -= 3;
727			}
728
729			feature_finish_pass_2 (&f_h);
730			feature_finish_pass_2 (&f_s);
731			feature_finish_pass_2 (&f_v);
732			}
733
734			hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
735			hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ;
736	root	1.38	hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;
737	root	1.36
738			av_push (result, histsv);
739			}
740
741			RETVAL = newRV_noinc ((SV *)result);
742			}
743			OUTPUT:
744			RETVAL
745