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 *
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:	1.25
Committed:	Fri Aug 19 00:34:54 2005 UTC (18 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.24:	+5 -5 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	1.2	transpose (GdkPixbuf *pb)
146			CODE:
147			{
148			int w = gdk_pixbuf_get_width (pb);
149			int h = gdk_pixbuf_get_height (pb);
150	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
151	root	1.2	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, bpp == 4, 8, h, w);
156
157			dst = gdk_pixbuf_get_pixels (RETVAL);
158			dstr = gdk_pixbuf_get_rowstride (RETVAL);
159
160	root	1.3	for (y = 0; y < h; y++)
161			for (x = 0; x < w; x++)
162	root	1.2	for (i = 0; i < bpp; i++)
163			dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i];
164			}
165			OUTPUT:
166			RETVAL
167
168	root	1.3	GdkPixbuf_noinc *
169	root	1.2	flop (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, w, h);
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	root	1.4	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
188	root	1.2	}
189			OUTPUT:
190			RETVAL
191
192	root	1.17	GdkPixbuf_noinc *
193	root	1.23	load_jpeg (SV *path, int thumbnail=0)
194	root	1.17	CODE:
195			{
196			struct jpeg_decompress_struct cinfo;
197			struct jpg_err_mgr jerr;
198			guchar *data;
199			int rs;
200			FILE *fp;
201			volatile GdkPixbuf *pb = 0;
202	root	1.23	gchar *filename;
203
204	root	1.17	RETVAL = 0;
205
206	root	1.23	filename = g_filename_from_utf8 (SvPVutf8_nolen (path), -1, 0, 0, 0);
207			fp = fopen (filename, "rb");
208			g_free (filename);
209
210			if (!fp)
211	root	1.17	XSRETURN_UNDEF;
212
213			cinfo.err = jpeg_std_error (&jerr.err);
214
215			jerr.err.error_exit = cv_error_exit;
216			jerr.err.output_message = cv_error_output;
217
218			if ((rs = setjmp (jerr.setjmp_buffer)))
219			{
220			fclose (fp);
221			jpeg_destroy_decompress (&cinfo);
222
223			if (pb)
224			g_object_unref ((gpointer)pb);
225
226			XSRETURN_UNDEF;
227			}
228
229			jpeg_create_decompress (&cinfo);
230
231			jpeg_stdio_src (&cinfo, fp);
232			jpeg_read_header (&cinfo, TRUE);
233
234			cinfo.dct_method = JDCT_DEFAULT;
235			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
236			cinfo.do_block_smoothing = FALSE;
237			cinfo.out_color_space = JCS_RGB;
238			cinfo.quantize_colors = FALSE;
239
240			cinfo.scale_num = 1;
241			cinfo.scale_denom = 1;
242
243			jpeg_calc_output_dimensions (&cinfo);
244
245			if (thumbnail)
246			{
247			cinfo.dct_method = JDCT_FASTEST;
248			cinfo.do_fancy_upsampling = FALSE;
249
250			while (cinfo.scale_denom < 8
251	root	1.21	&& cinfo.output_width >= IW*4
252			&& cinfo.output_height >= IH*4)
253	root	1.17	{
254			cinfo.scale_denom <<= 1;
255			jpeg_calc_output_dimensions (&cinfo);
256			}
257			}
258
259			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
260			if (!RETVAL)
261			longjmp (jerr.setjmp_buffer, 2);
262
263			data = gdk_pixbuf_get_pixels (RETVAL);
264			rs = gdk_pixbuf_get_rowstride (RETVAL);
265
266			if (cinfo.output_components != 3)
267			longjmp (jerr.setjmp_buffer, 3);
268
269			jpeg_start_decompress (&cinfo);
270
271			while (cinfo.output_scanline < cinfo.output_height)
272			{
273			int remaining = cinfo.output_height - cinfo.output_scanline;
274			JSAMPROW rp[4];
275
276			rp [0] = data + cinfo.output_scanline * rs;
277			rp [1] = (guchar *)rp [0] + rs;
278			rp [2] = (guchar *)rp [1] + rs;
279			rp [3] = (guchar *)rp [2] + rs;
280
281			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
282			}
283
284			jpeg_finish_decompress (&cinfo);
285			fclose (fp);
286			jpeg_destroy_decompress (&cinfo);
287			}
288			OUTPUT:
289			RETVAL
290
291	root	1.6	#############################################################################
292
293	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
294
295	root	1.18	SV *
296			foldcase (SV *pathsv)
297			PROTOTYPE: $
298			CODE:
299			{
300			STRLEN plen;
301	root	1.25	U8 path = (U8 )SvPVutf8 (pathsv, plen);
302	root	1.18	U8 *pend = path + plen;
303			U8 dst [plen * 6 * 3], *dstp = dst;
304
305			while (path < pend)
306			{
307	root	1.19	U8 ch = *path;
308
309			if (ch >= 'a' && ch <= 'z')
310			dstp++ = path++;
311			else if (ch >= '0' && ch <= '9')
312	root	1.18	{
313			STRLEN el, nl = 0;
314	root	1.19	while (path >= '0' && path <= '9' && path < pend)
315	root	1.18	path++, nl++;
316
317			for (el = nl; el < 6; el++)
318			*dstp++ = '0';
319
320			memcpy (dstp, path - nl, nl);
321			dstp += nl;
322			}
323			else
324			{
325			STRLEN cl;
326			to_utf8_fold (path, dstp, &cl);
327			dstp += cl;
328			path += is_utf8_char (path);
329			}
330			}
331
332	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
333	root	1.18	}
334			OUTPUT:
335			RETVAL
336
337	root	1.3	GdkPixbuf_noinc *
338	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
339	root	1.21	PROTOTYPE: @
340	root	1.2	CODE:
341			{
342			int x, y;
343			guchar dst, d;
344			int dstr;
345	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
346	root	1.2
347			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
348			dst = gdk_pixbuf_get_pixels (RETVAL);
349			dstr = gdk_pixbuf_get_rowstride (RETVAL);
350
351			for (y = 0; y < h; y++)
352			for (d = dst + y * dstr, x = 0; x < w; x++)
353			{
354	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
355			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
356			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
357	root	1.2
358			src++;
359			}
360	root	1.3	}
361			OUTPUT:
362			RETVAL
363
364			SV *
365			pb_to_p7 (GdkPixbuf *pb)
366			CODE:
367			{
368			int w = gdk_pixbuf_get_width (pb);
369			int h = gdk_pixbuf_get_height (pb);
370			int x, y;
371			guchar *dst;
372	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
373	root	1.3	guchar *src = gdk_pixbuf_get_pixels (pb);
374			int sstr = gdk_pixbuf_get_rowstride (pb);
375	root	1.5	int Er[IW], Eg[IW], Eb[IW];
376			int seed = 77;
377	root	1.3
378			RETVAL = newSV (w * h);
379			SvPOK_only (RETVAL);
380			SvCUR_set (RETVAL, w * h);
381
382	root	1.25	dst = (guchar *)SvPVX (RETVAL);
383	root	1.3
384	root	1.5	memset (Er, 0, sizeof (int) * IW);
385			memset (Eg, 0, sizeof (int) * IW);
386			memset (Eb, 0, sizeof (int) * IW);
387
388			/* some primitive error distribution + random dithering */
389
390	root	1.3	for (y = 0; y < h; y++)
391			{
392			int er = 0, eg = 0, eb = 0;
393
394			for (x = 0; x < w; x++)
395			{
396			int r, g, b;
397			guchar p = src + x bpp + y * sstr;
398
399	root	1.17	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
400			g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
401			b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
402	root	1.3
403			r = r > 7 ? 7 : r < 0 ? 0 : r;
404			g = g > 7 ? 7 : g < 0 ? 0 : g;
405			b = b > 3 ? 3 : b < 0 ? 0 : b;
406
407			er += p[0] - (r * 255 + 4) / 7;
408			eg += p[1] - (g * 255 + 4) / 7;
409			eb += p[2] - (b * 255 + 2) / 3;
410	root	1.5
411	root	1.17	Er[x] = er >> 1; er -= (er + 1) >> 1;
412			Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
413			Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
414	root	1.3
415			*dst++ = r << 5 \| g << 2 \| b;
416			}
417			}
418	root	1.2	}
419			OUTPUT:
420			RETVAL
421	root	1.6
422			#############################################################################
423	root	1.4
424			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
425
426			void
427	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
428	root	1.4	CODE:
429			{
430			int w = gdk_pixbuf_get_width (pb);
431			int h = gdk_pixbuf_get_height (pb);
432			int x, y, i;
433			guchar *dst;
434	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
435	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
436			int sstr = gdk_pixbuf_get_rowstride (pb);
437
438			a85_init ();
439
440			for (y = 0; y < h; y++)
441			for (x = 0; x < w; x++)
442	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
443	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
444
445			a85_finish (fp);
446	root	1.7	}
447
448			void
449			dump_binary (PerlIO fp, GdkPixbuf pb)
450			CODE:
451			{
452			int w = gdk_pixbuf_get_width (pb);
453			int h = gdk_pixbuf_get_height (pb);
454			int x, y, i;
455			guchar *dst;
456			int bpp = gdk_pixbuf_get_n_channels (pb);
457			guchar *src = gdk_pixbuf_get_pixels (pb);
458			int sstr = gdk_pixbuf_get_rowstride (pb);
459
460			for (y = 0; y < h; y++)
461			for (x = 0; x < w; x++)
462			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
463			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
464	root	1.4	}
465	root	1.8
466			#############################################################################
467
468			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
469
470			SV *
471			pb_to_hv84 (GdkPixbuf *pb)
472			CODE:
473			{
474			int w = gdk_pixbuf_get_width (pb);
475			int h = gdk_pixbuf_get_height (pb);
476			int x, y;
477			guchar *dst;
478			int bpp = gdk_pixbuf_get_n_channels (pb);
479			guchar *src = gdk_pixbuf_get_pixels (pb);
480			int sstr = gdk_pixbuf_get_rowstride (pb);
481
482			RETVAL = newSV (6 * 8 * 12 / 8);
483			SvPOK_only (RETVAL);
484			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
485
486	root	1.25	dst = (guchar *)SvPVX (RETVAL);
487	root	1.8
488			/* some primitive error distribution + random dithering */
489
490			for (y = 0; y < h; y++)
491			{
492			guchar p = src + y sstr;
493
494			for (x = 0; x < w; x += 2)
495			{
496			unsigned int r, g, b, h, s, v, H, V1, V2;
497
498			if (bpp == 3)
499			r = p++, g = p++, b = *p++;
500			else if (bpp == 1)
501			r = g = b = *p++;
502			else
503			abort ();
504
505			rgb_to_hsv (r, g, b, &h, &s, &v);
506
507			H = (h * 15 / 255) << 4;
508			V1 = v;
509
510			if (bpp == 3)
511			r = p++, g = p++, b = *p++;
512			else if (bpp == 1)
513			r = g = b = *p++;
514			else
515			abort ();
516
517			rgb_to_hsv (r, g, b, &h, &s, &v);
518
519			H \|= h * 15 / 255;
520			V2 = v;
521
522			*dst++ = H;
523			*dst++ = V1;
524			*dst++ = V2;
525			}
526			}
527			}
528			OUTPUT:
529			RETVAL
530	root	1.4
531	root	1.9	SV *
532			hv84_to_av (unsigned char *hv84)
533			CODE:
534			{
535			int i = 72 / 3;
536			AV *av = newAV ();
537
538			RETVAL = (SV )newRV_noinc ((SV )av);
539			while (i--)
540			{
541			int h = *hv84++;
542			int v1 = *hv84++;
543			int v2 = *hv84++;
544
545			av_push (av, newSViv (v1));
546			av_push (av, newSViv ((h >> 4) * 255 / 15));
547			av_push (av, newSViv (v2));
548			av_push (av, newSViv ((h & 15) * 255 / 15));
549			}
550			}
551			OUTPUT:
552			RETVAL
553	root	1.2
554	root	1.20	#############################################################################
555
556			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
557
558			SV *
559			make_histograms (SV *ar)
560			CODE:
561			{
562			int i;
563			AV av, result;
564
565			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
566			croak ("Not an array ref as first argument to make_histogram");
567
568			av = (AV *) SvRV (ar);
569			result = newAV ();
570
571			for (i = 0; i <= av_len (av); ++i)
572			{
573			const int HISTSIZE = 64;
574
575			int j;
576			SV sv = av_fetch (av, i, 1);
577			STRLEN len;
578			char *buf = SvPVbyte (sv, len);
579
580			int tmphist[HISTSIZE];
581			float *hist;
582
583			SV histsv = newSV (HISTSIZE sizeof (float) + 1);
584			SvPOK_on (histsv);
585			SvCUR_set (histsv, HISTSIZE * sizeof (float));
586			hist = (float *)SvPVX (histsv);
587
588			Zero (tmphist, sizeof (tmphist), char);
589
590			for (j = len; j--; )
591			{
592			unsigned int idx
593			= ((*buf & 0xc0) >> 2)
594			\| ((*buf & 0x18) >> 1)
595			\| (*buf & 0x03);
596
597			++tmphist[idx];
598			++buf;
599			}
600
601			for (j = 0; j < HISTSIZE; ++j)
602			hist[j] = (float)tmphist[j] / (len + 1e-30);
603
604			av_push (result, histsv);
605			}
606
607			RETVAL = newRV_noinc ((SV *)result);
608			}
609			OUTPUT:
610			RETVAL
611	root	1.1
612