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 = 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 (dst, dstp - dst);
}
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
p7_to_pb (int w, int h, guchar *src)
        PROTOTYPE: @
        CODE:
{
        int x, y;
        guchar *dst, *d;
        int 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 (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 = 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 = 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:	1.23
Committed:	Tue Aug 16 23:50:39 2005 UTC (18 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.22:	+10 -2 lines
Log Message:	* empty log message *
#	Content
1	#include "EXTERN.h"
2	#include "perl.h"
3	#include "XSUB.h"
4
5	#include <string.h>
6	#include <setjmp.h>
7
8	#include <jpeglib.h>
9	#include <glib.h>
10	#include <gtk/gtk.h>
11	#include <gdk-pixbuf/gdk-pixbuf.h>
12
13	#include <gperl.h>
14	#include <gtk2perl.h>
15
16	#define IW 80 /* MUST match Schnauer.pm! */
17	#define IH 60 /* MUST match Schnauer.pm! */
18
19	#define RAND (seed = (seed + 7141) * 54773 % 134456)
20
21	#define LINELENGTH 240
22
23	#define ELLIPSIS "\xe2\x80\xa6"
24
25	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	static guint32 a85_val;
71	static guint a85_cnt;
72	static guchar a85_buf[LINELENGTH], *a85_ptr;
73
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	static void
113	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	/////////////////////////////////////////////////////////////////////////////
126
127	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
128
129	PROTOTYPES: ENABLE
130
131	# 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	GdkPixbuf_noinc *
145	transpose (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, bpp == 4, 8, h, w);
156
157	dst = gdk_pixbuf_get_pixels (RETVAL);
158	dstr = gdk_pixbuf_get_rowstride (RETVAL);
159
160	for (y = 0; y < h; y++)
161	for (x = 0; x < w; x++)
162	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	GdkPixbuf_noinc *
169	flop (GdkPixbuf *pb)
170	CODE:
171	{
172	int w = gdk_pixbuf_get_width (pb);
173	int h = gdk_pixbuf_get_height (pb);
174	int bpp = gdk_pixbuf_get_n_channels (pb);
175	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	for (y = 0; y < h; y++)
185	for (x = 0; x < w; x++)
186	for (i = 0; i < bpp; i++)
187	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
188	}
189	OUTPUT:
190	RETVAL
191
192	GdkPixbuf_noinc *
193	load_jpeg (SV *path, int thumbnail=0)
194	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	gchar *filename;
203
204	RETVAL = 0;
205
206	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	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	&& cinfo.output_width >= IW*4
252	&& cinfo.output_height >= IH*4)
253	{
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	#############################################################################
292
293	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
294
295	SV *
296	foldcase (SV *pathsv)
297	PROTOTYPE: $
298	CODE:
299	{
300	STRLEN plen;
301	U8 *path = SvPVutf8 (pathsv, plen);
302	U8 *pend = path + plen;
303	U8 dst [plen * 6 * 3], *dstp = dst;
304
305	while (path < pend)
306	{
307	U8 ch = *path;
308
309	if (ch >= 'a' && ch <= 'z')
310	dstp++ = path++;
311	else if (ch >= '0' && ch <= '9')
312	{
313	STRLEN el, nl = 0;
314	while (path >= '0' && path <= '9' && path < pend)
315	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	RETVAL = newSVpvn (dst, dstp - dst);
333	}
334	OUTPUT:
335	RETVAL
336
337	GdkPixbuf_noinc *
338	p7_to_pb (int w, int h, guchar *src)
339	PROTOTYPE: @
340	CODE:
341	{
342	int x, y;
343	guchar dst, d;
344	int dstr;
345
346	RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
347	dst = gdk_pixbuf_get_pixels (RETVAL);
348	dstr = gdk_pixbuf_get_rowstride (RETVAL);
349
350	for (y = 0; y < h; y++)
351	for (d = dst + y * dstr, x = 0; x < w; x++)
352	{
353	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
354	d++ = (((src >> 2) & 7) * 255 + 4) / 7;
355	d++ = (((src >> 0) & 3) * 255 + 2) / 3;
356
357	src++;
358	}
359	}
360	OUTPUT:
361	RETVAL
362
363	SV *
364	pb_to_p7 (GdkPixbuf *pb)
365	CODE:
366	{
367	int w = gdk_pixbuf_get_width (pb);
368	int h = gdk_pixbuf_get_height (pb);
369	int x, y;
370	guchar *dst;
371	int bpp = gdk_pixbuf_get_n_channels (pb);
372	guchar *src = gdk_pixbuf_get_pixels (pb);
373	int sstr = gdk_pixbuf_get_rowstride (pb);
374	int Er[IW], Eg[IW], Eb[IW];
375	int seed = 77;
376
377	RETVAL = newSV (w * h);
378	SvPOK_only (RETVAL);
379	SvCUR_set (RETVAL, w * h);
380
381	dst = SvPVX (RETVAL);
382
383	memset (Er, 0, sizeof (int) * IW);
384	memset (Eg, 0, sizeof (int) * IW);
385	memset (Eb, 0, sizeof (int) * IW);
386
387	/* some primitive error distribution + random dithering */
388
389	for (y = 0; y < h; y++)
390	{
391	int er = 0, eg = 0, eb = 0;
392
393	for (x = 0; x < w; x++)
394	{
395	int r, g, b;
396	guchar p = src + x bpp + y * sstr;
397
398	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
399	g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
400	b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
401
402	r = r > 7 ? 7 : r < 0 ? 0 : r;
403	g = g > 7 ? 7 : g < 0 ? 0 : g;
404	b = b > 3 ? 3 : b < 0 ? 0 : b;
405
406	er += p[0] - (r * 255 + 4) / 7;
407	eg += p[1] - (g * 255 + 4) / 7;
408	eb += p[2] - (b * 255 + 2) / 3;
409
410	Er[x] = er >> 1; er -= (er + 1) >> 1;
411	Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
412	Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
413
414	*dst++ = r << 5 \| g << 2 \| b;
415	}
416	}
417	}
418	OUTPUT:
419	RETVAL
420
421	#############################################################################
422
423	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
424
425	void
426	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
427	CODE:
428	{
429	int w = gdk_pixbuf_get_width (pb);
430	int h = gdk_pixbuf_get_height (pb);
431	int x, y, i;
432	guchar *dst;
433	int bpp = gdk_pixbuf_get_n_channels (pb);
434	guchar *src = gdk_pixbuf_get_pixels (pb);
435	int sstr = gdk_pixbuf_get_rowstride (pb);
436
437	a85_init ();
438
439	for (y = 0; y < h; y++)
440	for (x = 0; x < w; x++)
441	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
442	a85_push (fp, src [x * bpp + y * sstr + i]);
443
444	a85_finish (fp);
445	}
446
447	void
448	dump_binary (PerlIO fp, GdkPixbuf pb)
449	CODE:
450	{
451	int w = gdk_pixbuf_get_width (pb);
452	int h = gdk_pixbuf_get_height (pb);
453	int x, y, i;
454	guchar *dst;
455	int bpp = gdk_pixbuf_get_n_channels (pb);
456	guchar *src = gdk_pixbuf_get_pixels (pb);
457	int sstr = gdk_pixbuf_get_rowstride (pb);
458
459	for (y = 0; y < h; y++)
460	for (x = 0; x < w; x++)
461	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
462	PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
463	}
464
465	#############################################################################
466
467	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
468
469	SV *
470	pb_to_hv84 (GdkPixbuf *pb)
471	CODE:
472	{
473	int w = gdk_pixbuf_get_width (pb);
474	int h = gdk_pixbuf_get_height (pb);
475	int x, y;
476	guchar *dst;
477	int bpp = gdk_pixbuf_get_n_channels (pb);
478	guchar *src = gdk_pixbuf_get_pixels (pb);
479	int sstr = gdk_pixbuf_get_rowstride (pb);
480
481	RETVAL = newSV (6 * 8 * 12 / 8);
482	SvPOK_only (RETVAL);
483	SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
484
485	dst = SvPVX (RETVAL);
486
487	/* some primitive error distribution + random dithering */
488
489	for (y = 0; y < h; y++)
490	{
491	guchar p = src + y sstr;
492
493	for (x = 0; x < w; x += 2)
494	{
495	unsigned int r, g, b, h, s, v, H, V1, V2;
496
497	if (bpp == 3)
498	r = p++, g = p++, b = *p++;
499	else if (bpp == 1)
500	r = g = b = *p++;
501	else
502	abort ();
503
504	rgb_to_hsv (r, g, b, &h, &s, &v);
505
506	H = (h * 15 / 255) << 4;
507	V1 = v;
508
509	if (bpp == 3)
510	r = p++, g = p++, b = *p++;
511	else if (bpp == 1)
512	r = g = b = *p++;
513	else
514	abort ();
515
516	rgb_to_hsv (r, g, b, &h, &s, &v);
517
518	H \|= h * 15 / 255;
519	V2 = v;
520
521	*dst++ = H;
522	*dst++ = V1;
523	*dst++ = V2;
524	}
525	}
526	}
527	OUTPUT:
528	RETVAL
529
530	SV *
531	hv84_to_av (unsigned char *hv84)
532	CODE:
533	{
534	int i = 72 / 3;
535	AV *av = newAV ();
536
537	RETVAL = (SV )newRV_noinc ((SV )av);
538	while (i--)
539	{
540	int h = *hv84++;
541	int v1 = *hv84++;
542	int v2 = *hv84++;
543
544	av_push (av, newSViv (v1));
545	av_push (av, newSViv ((h >> 4) * 255 / 15));
546	av_push (av, newSViv (v2));
547	av_push (av, newSViv ((h & 15) * 255 / 15));
548	}
549	}
550	OUTPUT:
551	RETVAL
552
553	#############################################################################
554
555	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
556
557	SV *
558	make_histograms (SV *ar)
559	CODE:
560	{
561	int i;
562	AV av, result;
563
564	if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
565	croak ("Not an array ref as first argument to make_histogram");
566
567	av = (AV *) SvRV (ar);
568	result = newAV ();
569
570	for (i = 0; i <= av_len (av); ++i)
571	{
572	const int HISTSIZE = 64;
573
574	int j;
575	SV sv = av_fetch (av, i, 1);
576	STRLEN len;
577	char *buf = SvPVbyte (sv, len);
578
579	int tmphist[HISTSIZE];
580	float *hist;
581
582	SV histsv = newSV (HISTSIZE sizeof (float) + 1);
583	SvPOK_on (histsv);
584	SvCUR_set (histsv, HISTSIZE * sizeof (float));
585	hist = (float *)SvPVX (histsv);
586
587	Zero (tmphist, sizeof (tmphist), char);
588
589	for (j = len; j--; )
590	{
591	unsigned int idx
592	= ((*buf & 0xc0) >> 2)
593	\| ((*buf & 0x18) >> 1)
594	\| (*buf & 0x03);
595
596	++tmphist[idx];
597	++buf;
598	}
599
600	for (j = 0; j < HISTSIZE; ++j)
601	hist[j] = (float)tmphist[j] / (len + 1e-30);
602
603	av_push (result, histsv);
604	}
605
606	RETVAL = newRV_noinc ((SV *)result);
607	}
608	OUTPUT:
609	RETVAL
610
611