CV/CV.xs

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

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

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

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

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

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

#define LINELENGTH 240

#define ELLIPSIS "\xe2\x80\xa6"

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;
    }
}

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 in Gtk2 perl module

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 *
transpose (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, bpp == 4, 8, h, w);

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

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

GdkPixbuf_noinc *
flop (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, bpp == 4, 8, w, h);

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

        for (y = 0; y < h; y++)
          for (x = 0; x < w; x++)
            for (i = 0; i < bpp; i++)
              dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
}
        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;
        gchar *filename;

        RETVAL = 0;

        filename = g_filename_from_utf8 (SvPVutf8_nolen (path), -1, 0, 0, 0);
        fp = fopen (filename, "rb");
        g_free (filename);

        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

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

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

SV *
foldcase (SV *pathsv)
        PROTOTYPE: $
        CODE:
{
        STRLEN plen;
        U8 *path = (U8 *)SvPVutf8 (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 >= '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
              {
                STRLEN cl;
                to_utf8_fold (path, dstp, &cl);
                dstp += cl;
                path += is_utf8_char (path);
              }
          }

        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

SV *
pb_to_p7 (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);
        int Er[IW], Eg[IW], Eb[IW];
        int seed = 77;

        RETVAL = newSV (w * h);
        SvPOK_only (RETVAL);
        SvCUR_set (RETVAL, w * h);

        dst = (guchar *)SvPVX (RETVAL);

        memset (Er, 0, sizeof (int) * IW);
        memset (Eg, 0, sizeof (int) * IW);
        memset (Eb, 0, sizeof (int) * IW);

        /* some primitive error distribution + random dithering */

        for (y = 0; y < h; y++)
          {
            int er = 0, eg = 0, eb = 0;

            for (x = 0; x < w; x++)
              {
                int r, g, b;
                guchar *p = src + x * bpp + y * sstr;

                r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
                g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
                b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;

                r = r > 7 ? 7 : r < 0 ? 0 : r;
                g = g > 7 ? 7 : g < 0 ? 0 : g;
                b = b > 3 ? 3 : b < 0 ? 0 : b;

                er += p[0] - (r * 255 + 4) / 7;
                eg += p[1] - (g * 255 + 4) / 7;
                eb += p[2] - (b * 255 + 2) / 3;

                Er[x] = er >> 1; er -= (er + 1) >> 1;
                Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
                Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;

                *dst++ = r << 5 | g << 2 | b;
              }
          }
}
        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 *
make_histograms (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 make_histogram");

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

        for (i = 0; i <= av_len (av); ++i)
          {
            const int HISTSIZE = 64;

            int j;
            SV *sv = *av_fetch (av, i, 1);
            STRLEN len;
            char *buf = SvPVbyte (sv, len);

            int tmphist[HISTSIZE];
            float *hist;

            SV *histsv = newSV (HISTSIZE * sizeof (float) + 1);
            SvPOK_on (histsv);
            SvCUR_set (histsv, HISTSIZE * sizeof (float));
            hist = (float *)SvPVX (histsv);

            Zero (tmphist, sizeof (tmphist), char);

            for (j = len; j--; )
              {
                unsigned int idx
                    = ((*buf & 0xc0) >> 2)
                    | ((*buf & 0x18) >> 1)
                    |  (*buf & 0x03);

                ++tmphist[idx];
                ++buf;
              }
            
            for (j = 0; j < HISTSIZE; ++j)
              hist[j] = (float)tmphist[j] / (len + 1e-30);

            av_push (result, histsv);
          }

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


Revision:	1.27
Committed:	Sun Aug 21 02:23:52 2005 UTC (18 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.26:	+0 -1 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
8			#include <jpeglib.h>
9	root	1.23	#include <glib.h>
10			#include <gtk/gtk.h>
11	root	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
12
13			#include <gperl.h>
14			#include <gtk2perl.h>
15
16	root	1.17	#define IW 80 /* MUST match Schnauer.pm! */
17			#define IH 60 /* MUST match Schnauer.pm! */
18	root	1.5
19			#define RAND (seed = (seed + 7141) * 54773 % 134456)
20
21	root	1.7	#define LINELENGTH 240
22
23	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
24
25	root	1.17	struct jpg_err_mgr
26			{
27			struct jpeg_error_mgr err;
28			jmp_buf setjmp_buffer;
29			};
30
31			static void
32			cv_error_exit (j_common_ptr cinfo)
33			{
34			longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
35			}
36
37			static void
38			cv_error_output (j_common_ptr cinfo)
39			{
40			return;
41			}
42
43			static void
44			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
45			unsigned int h, unsigned int s, unsigned int *v)
46			{
47			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
48			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
49			unsigned int delta = mx - mn;
50
51			*v = mx;
52
53			s = mx ? delta 255 / mx : 0;
54
55			if (delta == 0)
56			*h = 0;
57			else
58			{
59			if (r == mx)
60			h = ((int)g - (int)b) 255 / (int)(delta * 3);
61			else if (g == mx)
62			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
63			else if (b == mx)
64			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
65
66			*h &= 255;
67			}
68			}
69
70	root	1.4	static guint32 a85_val;
71			static guint a85_cnt;
72	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
73	root	1.4
74			static void
75			a85_init (void)
76			{
77			a85_cnt = 4;
78			a85_ptr = a85_buf;
79			}
80
81			static void
82			a85_push (PerlIO *fp, guchar c)
83			{
84			a85_val = a85_val << 8 \| c;
85
86			if (!--a85_cnt)
87			{
88			a85_cnt = 4;
89			if (a85_val)
90			{
91			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
92			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
93			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
94			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
95			a85_ptr[0] = (a85_val ) + 33;
96
97			a85_ptr += 5;
98			}
99			else
100			*a85_ptr++ = 'z';
101
102			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
103			{
104			*a85_ptr++ = '\n';
105			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
106			a85_ptr = a85_buf;
107			}
108			}
109
110			}
111
112	root	1.8	static void
113	root	1.4	a85_finish (PerlIO *fp)
114			{
115			while (a85_cnt != 4)
116			a85_push (fp, 0);
117
118			*a85_ptr++ = '~'; // probably buggy end-marker
119			*a85_ptr++ = '>'; // probably buggy end-marker
120			*a85_ptr++ = '\n';
121
122			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
123			}
124
125	root	1.6	/////////////////////////////////////////////////////////////////////////////
126
127	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
128	root	1.1
129			PROTOTYPES: ENABLE
130	root	1.2
131	root	1.22	# missing in Gtk2 perl module
132
133			gboolean
134			gdk_net_wm_supports (GdkAtom property)
135			CODE:
136			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
137			RETVAL = gdk_net_wm_supports (property);
138			#else
139			RETVAL = 0;
140			#endif
141			OUTPUT:
142			RETVAL
143
144	root	1.3	GdkPixbuf_noinc *
145	root	1.26	dealpha_expose (GdkPixbuf *pb)
146			CODE:
147			{
148			int w = gdk_pixbuf_get_width (pb);
149			int h = gdk_pixbuf_get_height (pb);
150			int bpp = gdk_pixbuf_get_n_channels (pb);
151			int x, y, i;
152			guchar src = gdk_pixbuf_get_pixels (pb), dst;
153			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
154
155			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
156
157			dst = gdk_pixbuf_get_pixels (RETVAL);
158			dstr = gdk_pixbuf_get_rowstride (RETVAL);
159
160			for (x = 0; x < w; x++)
161			for (y = 0; y < h; y++)
162			for (i = 0; i < 3; i++)
163			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
164			}
165			OUTPUT:
166			RETVAL
167
168			GdkPixbuf_noinc *
169	root	1.2	transpose (GdkPixbuf *pb)
170			CODE:
171			{
172			int w = gdk_pixbuf_get_width (pb);
173			int h = gdk_pixbuf_get_height (pb);
174	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
175	root	1.2	int x, y, i;
176			guchar src = gdk_pixbuf_get_pixels (pb), dst;
177			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
178
179			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, h, w);
180
181			dst = gdk_pixbuf_get_pixels (RETVAL);
182			dstr = gdk_pixbuf_get_rowstride (RETVAL);
183
184	root	1.3	for (y = 0; y < h; y++)
185			for (x = 0; x < w; x++)
186	root	1.2	for (i = 0; i < bpp; i++)
187			dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i];
188			}
189			OUTPUT:
190			RETVAL
191
192	root	1.3	GdkPixbuf_noinc *
193	root	1.2	flop (GdkPixbuf *pb)
194			CODE:
195			{
196			int w = gdk_pixbuf_get_width (pb);
197			int h = gdk_pixbuf_get_height (pb);
198	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
199	root	1.2	int x, y, i;
200			guchar src = gdk_pixbuf_get_pixels (pb), dst;
201			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
202
203			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, w, h);
204
205			dst = gdk_pixbuf_get_pixels (RETVAL);
206			dstr = gdk_pixbuf_get_rowstride (RETVAL);
207
208	root	1.3	for (y = 0; y < h; y++)
209			for (x = 0; x < w; x++)
210	root	1.2	for (i = 0; i < bpp; i++)
211	root	1.4	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
212	root	1.2	}
213			OUTPUT:
214			RETVAL
215
216	root	1.17	GdkPixbuf_noinc *
217	root	1.23	load_jpeg (SV *path, int thumbnail=0)
218	root	1.17	CODE:
219			{
220			struct jpeg_decompress_struct cinfo;
221			struct jpg_err_mgr jerr;
222			guchar *data;
223			int rs;
224			FILE *fp;
225			volatile GdkPixbuf *pb = 0;
226	root	1.23	gchar *filename;
227
228	root	1.17	RETVAL = 0;
229
230	root	1.23	filename = g_filename_from_utf8 (SvPVutf8_nolen (path), -1, 0, 0, 0);
231			fp = fopen (filename, "rb");
232			g_free (filename);
233
234			if (!fp)
235	root	1.17	XSRETURN_UNDEF;
236
237			cinfo.err = jpeg_std_error (&jerr.err);
238
239			jerr.err.error_exit = cv_error_exit;
240			jerr.err.output_message = cv_error_output;
241
242			if ((rs = setjmp (jerr.setjmp_buffer)))
243			{
244			fclose (fp);
245			jpeg_destroy_decompress (&cinfo);
246
247			if (pb)
248			g_object_unref ((gpointer)pb);
249
250			XSRETURN_UNDEF;
251			}
252
253			jpeg_create_decompress (&cinfo);
254
255			jpeg_stdio_src (&cinfo, fp);
256			jpeg_read_header (&cinfo, TRUE);
257
258			cinfo.dct_method = JDCT_DEFAULT;
259			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
260			cinfo.do_block_smoothing = FALSE;
261			cinfo.out_color_space = JCS_RGB;
262			cinfo.quantize_colors = FALSE;
263
264			cinfo.scale_num = 1;
265			cinfo.scale_denom = 1;
266
267			jpeg_calc_output_dimensions (&cinfo);
268
269			if (thumbnail)
270			{
271			cinfo.dct_method = JDCT_FASTEST;
272			cinfo.do_fancy_upsampling = FALSE;
273
274			while (cinfo.scale_denom < 8
275	root	1.21	&& cinfo.output_width >= IW*4
276			&& cinfo.output_height >= IH*4)
277	root	1.17	{
278			cinfo.scale_denom <<= 1;
279			jpeg_calc_output_dimensions (&cinfo);
280			}
281			}
282
283			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
284			if (!RETVAL)
285			longjmp (jerr.setjmp_buffer, 2);
286
287			data = gdk_pixbuf_get_pixels (RETVAL);
288			rs = gdk_pixbuf_get_rowstride (RETVAL);
289
290			if (cinfo.output_components != 3)
291			longjmp (jerr.setjmp_buffer, 3);
292
293			jpeg_start_decompress (&cinfo);
294
295			while (cinfo.output_scanline < cinfo.output_height)
296			{
297			int remaining = cinfo.output_height - cinfo.output_scanline;
298			JSAMPROW rp[4];
299
300			rp [0] = data + cinfo.output_scanline * rs;
301			rp [1] = (guchar *)rp [0] + rs;
302			rp [2] = (guchar *)rp [1] + rs;
303			rp [3] = (guchar *)rp [2] + rs;
304
305			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
306			}
307
308			jpeg_finish_decompress (&cinfo);
309			fclose (fp);
310			jpeg_destroy_decompress (&cinfo);
311			}
312			OUTPUT:
313			RETVAL
314
315	root	1.6	#############################################################################
316
317	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
318
319	root	1.18	SV *
320			foldcase (SV *pathsv)
321			PROTOTYPE: $
322			CODE:
323			{
324			STRLEN plen;
325	root	1.25	U8 path = (U8 )SvPVutf8 (pathsv, plen);
326	root	1.18	U8 *pend = path + plen;
327			U8 dst [plen * 6 * 3], *dstp = dst;
328
329			while (path < pend)
330			{
331	root	1.19	U8 ch = *path;
332
333			if (ch >= 'a' && ch <= 'z')
334			dstp++ = path++;
335			else if (ch >= '0' && ch <= '9')
336	root	1.18	{
337			STRLEN el, nl = 0;
338	root	1.19	while (path >= '0' && path <= '9' && path < pend)
339	root	1.18	path++, nl++;
340
341			for (el = nl; el < 6; el++)
342			*dstp++ = '0';
343
344			memcpy (dstp, path - nl, nl);
345			dstp += nl;
346			}
347			else
348			{
349			STRLEN cl;
350			to_utf8_fold (path, dstp, &cl);
351			dstp += cl;
352			path += is_utf8_char (path);
353			}
354			}
355
356	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
357	root	1.18	}
358			OUTPUT:
359			RETVAL
360
361	root	1.3	GdkPixbuf_noinc *
362	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
363	root	1.21	PROTOTYPE: @
364	root	1.2	CODE:
365			{
366			int x, y;
367			guchar dst, d;
368			int dstr;
369	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
370	root	1.2
371			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
372			dst = gdk_pixbuf_get_pixels (RETVAL);
373			dstr = gdk_pixbuf_get_rowstride (RETVAL);
374
375			for (y = 0; y < h; y++)
376			for (d = dst + y * dstr, x = 0; x < w; x++)
377			{
378	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
379			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
380			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
381	root	1.2
382			src++;
383			}
384	root	1.3	}
385			OUTPUT:
386			RETVAL
387
388			SV *
389			pb_to_p7 (GdkPixbuf *pb)
390			CODE:
391			{
392			int w = gdk_pixbuf_get_width (pb);
393			int h = gdk_pixbuf_get_height (pb);
394			int x, y;
395			guchar *dst;
396	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
397	root	1.3	guchar *src = gdk_pixbuf_get_pixels (pb);
398			int sstr = gdk_pixbuf_get_rowstride (pb);
399	root	1.5	int Er[IW], Eg[IW], Eb[IW];
400			int seed = 77;
401	root	1.3
402			RETVAL = newSV (w * h);
403			SvPOK_only (RETVAL);
404			SvCUR_set (RETVAL, w * h);
405
406	root	1.25	dst = (guchar *)SvPVX (RETVAL);
407	root	1.3
408	root	1.5	memset (Er, 0, sizeof (int) * IW);
409			memset (Eg, 0, sizeof (int) * IW);
410			memset (Eb, 0, sizeof (int) * IW);
411
412			/* some primitive error distribution + random dithering */
413
414	root	1.3	for (y = 0; y < h; y++)
415			{
416			int er = 0, eg = 0, eb = 0;
417
418			for (x = 0; x < w; x++)
419			{
420			int r, g, b;
421			guchar p = src + x bpp + y * sstr;
422
423	root	1.17	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
424			g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
425			b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
426	root	1.3
427			r = r > 7 ? 7 : r < 0 ? 0 : r;
428			g = g > 7 ? 7 : g < 0 ? 0 : g;
429			b = b > 3 ? 3 : b < 0 ? 0 : b;
430
431			er += p[0] - (r * 255 + 4) / 7;
432			eg += p[1] - (g * 255 + 4) / 7;
433			eb += p[2] - (b * 255 + 2) / 3;
434	root	1.5
435	root	1.17	Er[x] = er >> 1; er -= (er + 1) >> 1;
436			Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
437			Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
438	root	1.3
439			*dst++ = r << 5 \| g << 2 \| b;
440			}
441			}
442	root	1.2	}
443			OUTPUT:
444			RETVAL
445	root	1.6
446			#############################################################################
447	root	1.4
448			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
449
450			void
451	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
452	root	1.4	CODE:
453			{
454			int w = gdk_pixbuf_get_width (pb);
455			int h = gdk_pixbuf_get_height (pb);
456			int x, y, i;
457			guchar *dst;
458	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
459	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
460			int sstr = gdk_pixbuf_get_rowstride (pb);
461
462			a85_init ();
463
464			for (y = 0; y < h; y++)
465			for (x = 0; x < w; x++)
466	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
467	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
468
469			a85_finish (fp);
470	root	1.7	}
471
472			void
473			dump_binary (PerlIO fp, GdkPixbuf pb)
474			CODE:
475			{
476			int w = gdk_pixbuf_get_width (pb);
477			int h = gdk_pixbuf_get_height (pb);
478			int x, y, i;
479			guchar *dst;
480			int bpp = gdk_pixbuf_get_n_channels (pb);
481			guchar *src = gdk_pixbuf_get_pixels (pb);
482			int sstr = gdk_pixbuf_get_rowstride (pb);
483
484			for (y = 0; y < h; y++)
485			for (x = 0; x < w; x++)
486			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
487			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
488	root	1.4	}
489	root	1.8
490			#############################################################################
491
492			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
493
494			SV *
495			pb_to_hv84 (GdkPixbuf *pb)
496			CODE:
497			{
498			int w = gdk_pixbuf_get_width (pb);
499			int h = gdk_pixbuf_get_height (pb);
500			int x, y;
501			guchar *dst;
502			int bpp = gdk_pixbuf_get_n_channels (pb);
503			guchar *src = gdk_pixbuf_get_pixels (pb);
504			int sstr = gdk_pixbuf_get_rowstride (pb);
505
506			RETVAL = newSV (6 * 8 * 12 / 8);
507			SvPOK_only (RETVAL);
508			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
509
510	root	1.25	dst = (guchar *)SvPVX (RETVAL);
511	root	1.8
512			/* some primitive error distribution + random dithering */
513
514			for (y = 0; y < h; y++)
515			{
516			guchar p = src + y sstr;
517
518			for (x = 0; x < w; x += 2)
519			{
520			unsigned int r, g, b, h, s, v, H, V1, V2;
521
522			if (bpp == 3)
523			r = p++, g = p++, b = *p++;
524			else if (bpp == 1)
525			r = g = b = *p++;
526			else
527			abort ();
528
529			rgb_to_hsv (r, g, b, &h, &s, &v);
530
531			H = (h * 15 / 255) << 4;
532			V1 = v;
533
534			if (bpp == 3)
535			r = p++, g = p++, b = *p++;
536			else if (bpp == 1)
537			r = g = b = *p++;
538			else
539			abort ();
540
541			rgb_to_hsv (r, g, b, &h, &s, &v);
542
543			H \|= h * 15 / 255;
544			V2 = v;
545
546			*dst++ = H;
547			*dst++ = V1;
548			*dst++ = V2;
549			}
550			}
551			}
552			OUTPUT:
553			RETVAL
554	root	1.4
555	root	1.9	SV *
556			hv84_to_av (unsigned char *hv84)
557			CODE:
558			{
559			int i = 72 / 3;
560			AV *av = newAV ();
561
562			RETVAL = (SV )newRV_noinc ((SV )av);
563			while (i--)
564			{
565			int h = *hv84++;
566			int v1 = *hv84++;
567			int v2 = *hv84++;
568
569			av_push (av, newSViv (v1));
570			av_push (av, newSViv ((h >> 4) * 255 / 15));
571			av_push (av, newSViv (v2));
572			av_push (av, newSViv ((h & 15) * 255 / 15));
573			}
574			}
575			OUTPUT:
576			RETVAL
577	root	1.2
578	root	1.20	#############################################################################
579
580			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
581
582			SV *
583			make_histograms (SV *ar)
584			CODE:
585			{
586			int i;
587			AV av, result;
588
589			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
590			croak ("Not an array ref as first argument to make_histogram");
591
592			av = (AV *) SvRV (ar);
593			result = newAV ();
594
595			for (i = 0; i <= av_len (av); ++i)
596			{
597			const int HISTSIZE = 64;
598
599			int j;
600			SV sv = av_fetch (av, i, 1);
601			STRLEN len;
602			char *buf = SvPVbyte (sv, len);
603
604			int tmphist[HISTSIZE];
605			float *hist;
606
607			SV histsv = newSV (HISTSIZE sizeof (float) + 1);
608			SvPOK_on (histsv);
609			SvCUR_set (histsv, HISTSIZE * sizeof (float));
610			hist = (float *)SvPVX (histsv);
611
612			Zero (tmphist, sizeof (tmphist), char);
613
614			for (j = len; j--; )
615			{
616			unsigned int idx
617			= ((*buf & 0xc0) >> 2)
618			\| ((*buf & 0x18) >> 1)
619			\| (*buf & 0x03);
620
621			++tmphist[idx];
622			++buf;
623			}
624
625			for (j = 0; j < HISTSIZE; ++j)
626			hist[j] = (float)tmphist[j] / (len + 1e-30);
627
628			av_push (result, histsv);
629			}
630
631			RETVAL = newRV_noinc ((SV *)result);
632			}
633			OUTPUT:
634			RETVAL
635	root	1.1
636