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/gdkx.h>
#include <gdk-pixbuf/gdk-pixbuf.h>

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

#include <assert.h>

#if WEBP
#include <webp/decode.h>
#endif

#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;

static magic_t magic_cookie[2]; /* !mime, mime */

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 (SV *path_or_data)
        ALIAS:
        magic             = 0
        magic_mime        = 1
        magic_buffer      = 2
        magic_buffer_mime = 3
        CODE:
{
        STRLEN len;
        char *data = SvPVbyte (path_or_data, len);

        perlinterp_release ();

        if (!magic_cookie[0])
          {
            magic_cookie[0] = magic_open (MAGIC_SYMLINK);
            magic_cookie[1] = magic_open (MAGIC_SYMLINK | MAGIC_MIME);
          }

        RETVAL = ix & 2
          ? magic_buffer (magic_cookie[ix], data, len)
          : magic_file   (magic_cookie[ix], data);

        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 *
decode_webp (SV *image_data, int thumbnail = 0, int iw = 0, int ih = 0)
        CODE:
{
#if WEBP
        guchar *data;
        STRLEN data_size;
        int alpha;
        WebPDecoderConfig config;
        int inw, inh;

        data = SvPVbyte (image_data, data_size);

        perlinterp_release ();

        RETVAL = 0;

        if (!WebPInitDecoderConfig (&config))
          goto err;

        config.options.use_threads = 1;

        if (WebPGetFeatures (data, data_size, &config.input) != VP8_STATUS_OK)
          goto err;

        inw = config.input.width;
        inh = config.input.height;

        if (thumbnail)
          {
            if (inw * ih > inh * iw)
              ih = (iw * inh + inw - 1) / inw;
            else
              iw = (ih * inw + inh - 1) / inh;

            config.options.bypass_filtering    = 1;
            config.options.no_fancy_upsampling = 1;

            config.options.use_scaling   = 1;
            config.options.scaled_width  = iw;
            config.options.scaled_height = ih;
          }
        else
          {
            iw = inw;
            ih = inh;
          }

        alpha = config.input.has_alpha;

        RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, !!alpha, 8, iw, ih);
        if (!RETVAL)
          goto err;

        config.output.colorspace = alpha ? MODE_RGBA : MODE_RGB;
        config.output.u.RGBA.rgba   = gdk_pixbuf_get_pixels      (RETVAL);
        config.output.u.RGBA.stride = gdk_pixbuf_get_rowstride   (RETVAL);
        config.output.u.RGBA.size   = gdk_pixbuf_get_byte_length (RETVAL);
        config.output.is_external_memory = 1;

        if (WebPDecode (data, data_size, &config) != VP8_STATUS_OK)
          {
            g_object_unref (RETVAL);
            RETVAL = 0;
            goto err;
          }

        err:
        perlinterp_acquire ();
#else
        croak ("load_webp: webp not enabled at compile time");
#endif
}
        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];

                if (0)
                if (cinfo.Adobe_transform == 2)
                  {
                    c ^= 0xff;
                    m ^= 0xff;
                    y ^= 0xff;
                    k ^= 0xff;
                  }

                data [0] = (c * k + 0x80) / 0xff;
                data [1] = (m * k + 0x80) / 0xff;
                data [2] = (y * k + 0x80) / 0xff;
                data [3] = 0xff;

                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:	1.51
Committed:	Sat Dec 23 04:11:49 2017 UTC (6 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.50:	+36 -38 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	1.50	#include <gdk/gdkx.h>
15	root	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
16
17			#include <gperl.h>
18			#include <gtk2perl.h>
19
20	root	1.43	#include <assert.h>
21
22	root	1.50	#if WEBP
23			#include <webp/decode.h>
24			#endif
25
26	root	1.46	#include "perlmulticore.h"
27
28	root	1.33	#define IW 80 /* MUST match Schnauzer.pm! */
29			#define IH 60 /* MUST match Schnauzer.pm! */
30	root	1.5
31			#define RAND (seed = (seed + 7141) * 54773 % 134456)
32
33	root	1.7	#define LINELENGTH 240
34
35	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
36
37	root	1.42	typedef char *octet_string;
38
39	root	1.51	static magic_t magic_cookie[2]; /* !mime, mime */
40
41	root	1.17	struct jpg_err_mgr
42			{
43			struct jpeg_error_mgr err;
44			jmp_buf setjmp_buffer;
45			};
46
47			static void
48			cv_error_exit (j_common_ptr cinfo)
49			{
50	root	1.48	cinfo->err->output_message (cinfo);
51	root	1.17	longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
52			}
53
54			static void
55			cv_error_output (j_common_ptr cinfo)
56			{
57	root	1.48	char msg[JMSG_LENGTH_MAX];
58
59			cinfo->err->format_message (cinfo, msg);
60
61			fprintf (stderr, "JPEG decoding error: %s\n", msg);
62	root	1.17	return;
63			}
64
65			static void
66			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
67			unsigned int h, unsigned int s, unsigned int *v)
68			{
69			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
70			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
71			unsigned int delta = mx - mn;
72
73			*v = mx;
74
75			s = mx ? delta 255 / mx : 0;
76
77			if (delta == 0)
78			*h = 0;
79			else
80			{
81			if (r == mx)
82			h = ((int)g - (int)b) 255 / (int)(delta * 3);
83			else if (g == mx)
84			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
85			else if (b == mx)
86			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
87
88			*h &= 255;
89			}
90			}
91
92	root	1.36	struct feature {
93			float v1, v2, v3; // mean, square, cube
94			int n;
95			};
96
97			static void
98			feature_init (struct feature *f)
99			{
100			f->v1 = 0.;
101			f->v2 = 0.;
102			f->v3 = 0.;
103			f->n = 0;
104			}
105
106			// didn't find an algorithm to neatly do mean, variance and skew in one pass.
107			// elmex ist schuld.
108			static void
109			feature_update_pass_1 (struct feature *f, unsigned int v)
110			{
111			f->v1 += v;
112			f->n += 1;
113			}
114
115			static void
116			feature_finish_pass_1 (struct feature *f)
117			{
118			if (f->n < 1)
119			return;
120
121			f->v1 /= f->n;
122			}
123
124			static void
125			feature_update_pass_2 (struct feature *f, unsigned int v)
126			{
127			float d = v - f->v1;
128
129			f->v2 += d * d;
130			f->v3 += d * d * d;
131			}
132
133			static void
134			feature_finish_pass_2 (struct feature *f)
135			{
136			if (f->n < 1)
137			return;
138
139			f->v2 /= f->n;
140			f->v3 /= f->n;
141
142			f->v1 /= 255.;
143	root	1.37	f->v2 /= 255. * 255.; f->v2 = sqrtf (f->v2);
144			f->v3 /= 255. * 255. * 255.; f->v3 = powf (fabsf (f->v3), 1./3.);
145	root	1.36	}
146
147	root	1.4	static guint32 a85_val;
148			static guint a85_cnt;
149	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
150	root	1.4
151			static void
152			a85_init (void)
153			{
154			a85_cnt = 4;
155			a85_ptr = a85_buf;
156			}
157
158			static void
159			a85_push (PerlIO *fp, guchar c)
160			{
161			a85_val = a85_val << 8 \| c;
162
163			if (!--a85_cnt)
164			{
165			a85_cnt = 4;
166			if (a85_val)
167			{
168	root	1.49	a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
169			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
170			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
171	root	1.4	a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
172			a85_ptr[0] = (a85_val ) + 33;
173
174			a85_ptr += 5;
175			}
176			else
177			*a85_ptr++ = 'z';
178
179			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
180			{
181			*a85_ptr++ = '\n';
182			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
183			a85_ptr = a85_buf;
184			}
185			}
186
187			}
188
189	root	1.8	static void
190	root	1.4	a85_finish (PerlIO *fp)
191			{
192			while (a85_cnt != 4)
193			a85_push (fp, 0);
194
195			*a85_ptr++ = '~'; // probably buggy end-marker
196			*a85_ptr++ = '>'; // probably buggy end-marker
197			*a85_ptr++ = '\n';
198
199			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
200			}
201
202	root	1.6	/////////////////////////////////////////////////////////////////////////////
203
204	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
205	root	1.1
206			PROTOTYPES: ENABLE
207	root	1.2
208	root	1.29	# missing function in perl. really :)
209			int
210			common_prefix_length (a, b)
211			unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
212			unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
213			CODE:
214			RETVAL = 0;
215
216			while (a == b && *a)
217			{
218			RETVAL += (*a & 0xc0) != 0x80;
219			a++, b++;
220			}
221
222			OUTPUT:
223			RETVAL
224
225	root	1.31	const char *
226	root	1.51	magic (SV *path_or_data)
227			ALIAS:
228			magic = 0
229			magic_mime = 1
230			magic_buffer = 2
231			magic_buffer_mime = 3
232	root	1.31	CODE:
233			{
234	root	1.51	STRLEN len;
235			char *data = SvPVbyte (path_or_data, len);
236	root	1.31
237	root	1.51	perlinterp_release ();
238	root	1.32
239	root	1.51	if (!magic_cookie[0])
240			{
241			magic_cookie[0] = magic_open (MAGIC_SYMLINK);
242			magic_cookie[1] = magic_open (MAGIC_SYMLINK \| MAGIC_MIME);
243	root	1.32	}
244
245	root	1.51	RETVAL = ix & 2
246			? magic_buffer (magic_cookie[ix], data, len)
247			: magic_file (magic_cookie[ix], data);
248	root	1.32
249	root	1.46	perlinterp_acquire ();
250	root	1.31	}
251			OUTPUT:
252			RETVAL
253
254	root	1.40	# missing/broken in Gtk2 perl module
255
256			void
257			gdk_window_clear_hints (GdkWindow *window)
258			CODE:
259			gdk_window_set_geometry_hints (window, 0, 0);
260	root	1.22
261			gboolean
262			gdk_net_wm_supports (GdkAtom property)
263			CODE:
264			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
265			RETVAL = gdk_net_wm_supports (property);
266			#else
267			RETVAL = 0;
268			#endif
269			OUTPUT:
270			RETVAL
271
272	root	1.3	GdkPixbuf_noinc *
273	root	1.26	dealpha_expose (GdkPixbuf *pb)
274			CODE:
275	root	1.46	perlinterp_release ();
276	root	1.26	{
277			int w = gdk_pixbuf_get_width (pb);
278			int h = gdk_pixbuf_get_height (pb);
279			int bpp = gdk_pixbuf_get_n_channels (pb);
280			int x, y, i;
281			guchar src = gdk_pixbuf_get_pixels (pb), dst;
282			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
283
284			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
285
286			dst = gdk_pixbuf_get_pixels (RETVAL);
287			dstr = gdk_pixbuf_get_rowstride (RETVAL);
288
289			for (x = 0; x < w; x++)
290			for (y = 0; y < h; y++)
291			for (i = 0; i < 3; i++)
292			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
293			}
294	root	1.46	perlinterp_acquire ();
295	root	1.26	OUTPUT:
296			RETVAL
297
298			GdkPixbuf_noinc *
299	root	1.28	rotate (GdkPixbuf *pb, int angle)
300	root	1.2	CODE:
301	root	1.46	perlinterp_release ();
302	root	1.44	if (angle < 0)
303			angle += 360;
304	root	1.28	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
305			: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
306			: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
307			: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
308			: angle);
309	root	1.46	perlinterp_acquire ();
310	root	1.2	OUTPUT:
311			RETVAL
312
313	root	1.17	GdkPixbuf_noinc *
314	root	1.51	decode_webp (SV *image_data, int thumbnail = 0, int iw = 0, int ih = 0)
315	root	1.50	CODE:
316			{
317			#if WEBP
318	root	1.51	guchar *data;
319	root	1.50	STRLEN data_size;
320			int alpha;
321			WebPDecoderConfig config;
322	root	1.51	int inw, inh;
323
324			data = SvPVbyte (image_data, data_size);
325	root	1.50
326			perlinterp_release ();
327
328			RETVAL = 0;
329
330			if (!WebPInitDecoderConfig (&config))
331			goto err;
332
333			config.options.use_threads = 1;
334
335	root	1.51	if (WebPGetFeatures (data, data_size, &config.input) != VP8_STATUS_OK)
336			goto err;
337
338			inw = config.input.width;
339			inh = config.input.height;
340
341	root	1.50	if (thumbnail)
342			{
343	root	1.51	if (inw * ih > inh * iw)
344			ih = (iw * inh + inw - 1) / inw;
345			else
346			iw = (ih * inw + inh - 1) / inh;
347
348	root	1.50	config.options.bypass_filtering = 1;
349			config.options.no_fancy_upsampling = 1;
350
351			config.options.use_scaling = 1;
352			config.options.scaled_width = iw;
353			config.options.scaled_height = ih;
354			}
355			else
356			{
357	root	1.51	iw = inw;
358			ih = inh;
359	root	1.50	}
360
361			alpha = config.input.has_alpha;
362
363			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, !!alpha, 8, iw, ih);
364			if (!RETVAL)
365			goto err;
366
367			config.output.colorspace = alpha ? MODE_RGBA : MODE_RGB;
368			config.output.u.RGBA.rgba = gdk_pixbuf_get_pixels (RETVAL);
369			config.output.u.RGBA.stride = gdk_pixbuf_get_rowstride (RETVAL);
370			config.output.u.RGBA.size = gdk_pixbuf_get_byte_length (RETVAL);
371			config.output.is_external_memory = 1;
372
373			if (WebPDecode (data, data_size, &config) != VP8_STATUS_OK)
374			{
375			g_object_unref (RETVAL);
376			RETVAL = 0;
377			goto err;
378			}
379
380			err:
381			perlinterp_acquire ();
382			#else
383			croak ("load_webp: webp not enabled at compile time");
384			#endif
385			}
386			OUTPUT:
387			RETVAL
388
389			GdkPixbuf_noinc *
390	root	1.47	load_jpeg (SV *path, int thumbnail = 0, int iw = 0, int ih = 0)
391	root	1.17	CODE:
392			{
393			struct jpeg_decompress_struct cinfo;
394			struct jpg_err_mgr jerr;
395			guchar *data;
396			int rs;
397			FILE *fp;
398			volatile GdkPixbuf *pb = 0;
399	root	1.23
400	root	1.17	RETVAL = 0;
401
402	root	1.30	fp = fopen (SvPVbyte_nolen (path), "rb");
403	root	1.23
404			if (!fp)
405	root	1.17	XSRETURN_UNDEF;
406
407	root	1.46	perlinterp_release ();
408
409	root	1.17	cinfo.err = jpeg_std_error (&jerr.err);
410
411			jerr.err.error_exit = cv_error_exit;
412			jerr.err.output_message = cv_error_output;
413
414			if ((rs = setjmp (jerr.setjmp_buffer)))
415			{
416			fclose (fp);
417			jpeg_destroy_decompress (&cinfo);
418
419			if (pb)
420			g_object_unref ((gpointer)pb);
421
422	root	1.46	perlinterp_acquire ();
423	root	1.17	XSRETURN_UNDEF;
424			}
425
426			jpeg_create_decompress (&cinfo);
427
428			jpeg_stdio_src (&cinfo, fp);
429			jpeg_read_header (&cinfo, TRUE);
430
431			cinfo.dct_method = JDCT_DEFAULT;
432			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
433			cinfo.do_block_smoothing = FALSE;
434			cinfo.out_color_space = JCS_RGB;
435			cinfo.quantize_colors = FALSE;
436
437			cinfo.scale_num = 1;
438			cinfo.scale_denom = 1;
439
440			jpeg_calc_output_dimensions (&cinfo);
441
442			if (thumbnail)
443			{
444			cinfo.dct_method = JDCT_FASTEST;
445			cinfo.do_fancy_upsampling = FALSE;
446
447			while (cinfo.scale_denom < 8
448	root	1.47	&& cinfo.output_width >= iw*4
449			&& cinfo.output_height >= ih*4)
450	root	1.17	{
451			cinfo.scale_denom <<= 1;
452			jpeg_calc_output_dimensions (&cinfo);
453			}
454			}
455
456	root	1.48	if (cinfo.output_components != 3)
457			longjmp (jerr.setjmp_buffer, 3);
458
459			if (cinfo.jpeg_color_space == JCS_YCCK \|\| cinfo.jpeg_color_space == JCS_CMYK)
460			{
461			cinfo.out_color_space = JCS_CMYK;
462			cinfo.output_components = 4;
463			}
464
465			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, cinfo.output_components == 4, 8, cinfo.output_width, cinfo.output_height);
466	root	1.17	if (!RETVAL)
467			longjmp (jerr.setjmp_buffer, 2);
468
469			data = gdk_pixbuf_get_pixels (RETVAL);
470			rs = gdk_pixbuf_get_rowstride (RETVAL);
471
472			jpeg_start_decompress (&cinfo);
473
474			while (cinfo.output_scanline < cinfo.output_height)
475			{
476			int remaining = cinfo.output_height - cinfo.output_scanline;
477			JSAMPROW rp[4];
478
479			rp [0] = data + cinfo.output_scanline * rs;
480			rp [1] = (guchar *)rp [0] + rs;
481			rp [2] = (guchar *)rp [1] + rs;
482			rp [3] = (guchar *)rp [2] + rs;
483
484			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
485			}
486
487	root	1.48	if (cinfo.out_color_space == JCS_CMYK)
488			{
489			guchar end = data + cinfo.output_height rs;
490
491			while (data < end)
492			{
493			U32 c = data [0];
494			U32 m = data [1];
495			U32 y = data [2];
496			U32 k = data [3];
497
498	root	1.49	if (0)
499			if (cinfo.Adobe_transform == 2)
500			{
501			c ^= 0xff;
502			m ^= 0xff;
503			y ^= 0xff;
504			k ^= 0xff;
505			}
506
507			data [0] = (c * k + 0x80) / 0xff;
508			data [1] = (m * k + 0x80) / 0xff;
509			data [2] = (y * k + 0x80) / 0xff;
510			data [3] = 0xff;
511	root	1.48
512			data += 4;
513			}
514			}
515
516	root	1.17	jpeg_finish_decompress (&cinfo);
517			fclose (fp);
518			jpeg_destroy_decompress (&cinfo);
519	root	1.46	perlinterp_acquire ();
520	root	1.17	}
521			OUTPUT:
522			RETVAL
523
524	root	1.33	void
525			compare (GdkPixbuf a, GdkPixbuf b)
526			PPCODE:
527	root	1.46	perlinterp_release ();
528	root	1.33	{
529			int w = gdk_pixbuf_get_width (a);
530			int h = gdk_pixbuf_get_height (a);
531	root	1.43
532	root	1.33	int sa = gdk_pixbuf_get_rowstride (a);
533			int sb = gdk_pixbuf_get_rowstride (b);
534
535			guchar *pa = gdk_pixbuf_get_pixels (a);
536			guchar *pb = gdk_pixbuf_get_pixels (b);
537
538			int x, y;
539
540			assert (w == gdk_pixbuf_get_width (b));
541			assert (h == gdk_pixbuf_get_height (b));
542
543			assert (gdk_pixbuf_get_n_channels (a) == 3);
544			assert (gdk_pixbuf_get_n_channels (b) == 3);
545
546			double diff = 0.;
547			int peak = 0;
548
549	root	1.35	if (w && h)
550	root	1.34	for (y = 0; y < h; y++)
551			{
552			guchar pa_ = pa + y sa;
553			guchar pb_ = pb + y sb;
554	root	1.33
555	root	1.34	for (x = 0; x < w; x++)
556			{
557			int d;
558
559			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
560			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
561			d = ((int)pa_++) - ((int)pb_++); diff += d*d; peak = MAX (peak, abs (d));
562			}
563			}
564	root	1.33
565	root	1.46	perlinterp_acquire ();
566
567	root	1.33	EXTEND (SP, 2);
568			PUSHs (sv_2mortal (newSVnv (sqrt (diff / (w * h * 3. * 255. * 255.)))));
569			PUSHs (sv_2mortal (newSVnv (peak / 255.)));
570			}
571
572	root	1.6	#############################################################################
573
574	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
575
576	root	1.41	# currently only works for filenames (octet strings)
577
578	root	1.18	SV *
579			foldcase (SV *pathsv)
580			PROTOTYPE: $
581			CODE:
582			{
583			STRLEN plen;
584	root	1.41	U8 path = (U8 )SvPV (pathsv, plen);
585	root	1.18	U8 *pend = path + plen;
586			U8 dst [plen * 6 * 3], *dstp = dst;
587
588			while (path < pend)
589			{
590	root	1.19	U8 ch = *path;
591
592			if (ch >= 'a' && ch <= 'z')
593			dstp++ = path++;
594	root	1.41	else if (ch >= 'A' && ch <= 'Z')
595			dstp++ = path++ + ('a' - 'A');
596	root	1.19	else if (ch >= '0' && ch <= '9')
597	root	1.18	{
598			STRLEN el, nl = 0;
599	root	1.19	while (path >= '0' && path <= '9' && path < pend)
600	root	1.18	path++, nl++;
601
602			for (el = nl; el < 6; el++)
603			*dstp++ = '0';
604
605			memcpy (dstp, path - nl, nl);
606			dstp += nl;
607			}
608			else
609	root	1.41	dstp++ = path++;
610			#if 0
611			else
612	root	1.18	{
613			STRLEN cl;
614			to_utf8_fold (path, dstp, &cl);
615			dstp += cl;
616			path += is_utf8_char (path);
617			}
618	root	1.41	#endif
619	root	1.18	}
620
621	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
622	root	1.18	}
623			OUTPUT:
624			RETVAL
625
626	root	1.3	GdkPixbuf_noinc *
627	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
628	root	1.21	PROTOTYPE: @
629	root	1.2	CODE:
630			{
631			int x, y;
632			guchar dst, d;
633			int dstr;
634	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
635	root	1.2
636			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
637			dst = gdk_pixbuf_get_pixels (RETVAL);
638			dstr = gdk_pixbuf_get_rowstride (RETVAL);
639
640			for (y = 0; y < h; y++)
641			for (d = dst + y * dstr, x = 0; x < w; x++)
642			{
643	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
644			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
645			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
646	root	1.2
647			src++;
648			}
649	root	1.3	}
650			OUTPUT:
651			RETVAL
652
653	root	1.6	#############################################################################
654	root	1.4
655			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
656
657			void
658	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
659	root	1.4	CODE:
660			{
661			int w = gdk_pixbuf_get_width (pb);
662			int h = gdk_pixbuf_get_height (pb);
663			int x, y, i;
664			guchar *dst;
665	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
666	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
667			int sstr = gdk_pixbuf_get_rowstride (pb);
668
669			a85_init ();
670
671			for (y = 0; y < h; y++)
672			for (x = 0; x < w; x++)
673	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
674	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
675
676			a85_finish (fp);
677	root	1.7	}
678
679			void
680			dump_binary (PerlIO fp, GdkPixbuf pb)
681			CODE:
682			{
683			int w = gdk_pixbuf_get_width (pb);
684			int h = gdk_pixbuf_get_height (pb);
685			int x, y, i;
686			guchar *dst;
687			int bpp = gdk_pixbuf_get_n_channels (pb);
688			guchar *src = gdk_pixbuf_get_pixels (pb);
689			int sstr = gdk_pixbuf_get_rowstride (pb);
690
691			for (y = 0; y < h; y++)
692			for (x = 0; x < w; x++)
693			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
694			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
695	root	1.4	}
696	root	1.8
697			#############################################################################
698
699			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
700
701			SV *
702			pb_to_hv84 (GdkPixbuf *pb)
703			CODE:
704			{
705			int w = gdk_pixbuf_get_width (pb);
706			int h = gdk_pixbuf_get_height (pb);
707			int x, y;
708			guchar *dst;
709			int bpp = gdk_pixbuf_get_n_channels (pb);
710			guchar *src = gdk_pixbuf_get_pixels (pb);
711			int sstr = gdk_pixbuf_get_rowstride (pb);
712
713			RETVAL = newSV (6 * 8 * 12 / 8);
714			SvPOK_only (RETVAL);
715			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
716
717	root	1.25	dst = (guchar *)SvPVX (RETVAL);
718	root	1.8
719			/* some primitive error distribution + random dithering */
720
721			for (y = 0; y < h; y++)
722			{
723			guchar p = src + y sstr;
724
725			for (x = 0; x < w; x += 2)
726			{
727			unsigned int r, g, b, h, s, v, H, V1, V2;
728
729			if (bpp == 3)
730			r = p++, g = p++, b = *p++;
731			else if (bpp == 1)
732			r = g = b = *p++;
733			else
734			abort ();
735
736			rgb_to_hsv (r, g, b, &h, &s, &v);
737
738			H = (h * 15 / 255) << 4;
739			V1 = v;
740
741			if (bpp == 3)
742			r = p++, g = p++, b = *p++;
743			else if (bpp == 1)
744			r = g = b = *p++;
745			else
746			abort ();
747
748			rgb_to_hsv (r, g, b, &h, &s, &v);
749
750			H \|= h * 15 / 255;
751			V2 = v;
752
753			*dst++ = H;
754			*dst++ = V1;
755			*dst++ = V2;
756			}
757			}
758			}
759			OUTPUT:
760			RETVAL
761	root	1.4
762	root	1.9	SV *
763			hv84_to_av (unsigned char *hv84)
764			CODE:
765			{
766			int i = 72 / 3;
767			AV *av = newAV ();
768
769			RETVAL = (SV )newRV_noinc ((SV )av);
770			while (i--)
771			{
772			int h = *hv84++;
773			int v1 = *hv84++;
774			int v2 = *hv84++;
775
776			av_push (av, newSViv (v1));
777			av_push (av, newSViv ((h >> 4) * 255 / 15));
778			av_push (av, newSViv (v2));
779			av_push (av, newSViv ((h & 15) * 255 / 15));
780			}
781			}
782			OUTPUT:
783			RETVAL
784	root	1.2
785	root	1.20	#############################################################################
786
787			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
788
789			SV *
790	root	1.36	extract_features (SV *ar)
791			CODE:
792			{
793			int i;
794			AV av, result;
795
796			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
797	root	1.39	croak ("Not an array ref as first argument to extract_features");
798	root	1.36
799			av = (AV *) SvRV (ar);
800			result = newAV ();
801
802			for (i = 0; i <= av_len (av); ++i)
803			{
804			SV sv = av_fetch (av, i, 1);
805			SV histsv = newSV (9 sizeof (float) + 1);
806
807			SvPOK_on (histsv);
808			SvCUR_set (histsv, 9 * sizeof (float));
809			float hist = (float )SvPVX (histsv);
810
811			struct feature f_h, f_s, f_v;
812			feature_init (&f_h);
813			feature_init (&f_s);
814			feature_init (&f_v);
815
816			{
817			STRLEN len;
818			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
819			while (len >= 3)
820			{
821			unsigned int r, g, b, h, s, v;
822			r = buf++; g = buf++; b = *buf++;
823			rgb_to_hsv (r, g, b, &h, &s, &v);
824
825			feature_update_pass_1 (&f_h, h);
826			feature_update_pass_1 (&f_s, s);
827			feature_update_pass_1 (&f_v, v);
828
829			len -= 3;
830			}
831
832			feature_finish_pass_1 (&f_h);
833			feature_finish_pass_1 (&f_s);
834			feature_finish_pass_1 (&f_v);
835			}
836
837			{
838			STRLEN len;
839			unsigned char buf = (unsigned char )SvPVbyte (sv, len);
840			while (len >= 3)
841			{
842			unsigned int r, g, b, h, s, v;
843			r = buf++; g = buf++; b = *buf++;
844			rgb_to_hsv (r, g, b, &h, &s, &v);
845
846			feature_update_pass_2 (&f_h, h);
847			feature_update_pass_2 (&f_s, s);
848			feature_update_pass_2 (&f_v, v);
849
850			len -= 3;
851			}
852
853			feature_finish_pass_2 (&f_h);
854			feature_finish_pass_2 (&f_s);
855			feature_finish_pass_2 (&f_v);
856			}
857
858			hist [0] = f_h.v1 * 2.; hist [1] = f_h.v2 * 2.; hist [2] = f_h.v3 * 2.;
859			hist [3] = f_s.v1 ; hist [4] = f_s.v2 ; hist [5] = f_s.v3 ;
860	root	1.38	hist [6] = f_v.v1 * .5; hist [7] = f_v.v2 * .5; hist [8] = f_v.v3 * .5;
861	root	1.36
862			av_push (result, histsv);
863			}
864
865			RETVAL = newRV_noinc ((SV *)result);
866			}
867			OUTPUT:
868			RETVAL
869