CV/CV.xs

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

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

#include <magic.h>

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

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

#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 function in perl. really :)
int
common_prefix_length (a, b)
        unsigned char *a = (unsigned char *)SvPVutf8_nolen ($arg);
        unsigned char *b = (unsigned char *)SvPVutf8_nolen ($arg);
        CODE:
        RETVAL = 0;

        while (*a == *b && *a)
          {
            RETVAL += (*a & 0xc0) != 0x80;
            a++, b++;
          }

        OUTPUT:
        RETVAL

const char *
magic (const char *path)
        CODE:
{
        static magic_t cookie;

        if (!cookie)
          {
            cookie = magic_open (MAGIC_NONE);

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

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

const char *
magic_mime (const char *path)
        CODE:
{
        static magic_t cookie;

        if (!cookie)
          {
            cookie = magic_open (MAGIC_MIME);

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

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

# missing 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 *
rotate (GdkPixbuf *pb, int angle)
        CODE:
        RETVAL = gdk_pixbuf_rotate_simple (pb, angle ==   0 ? GDK_PIXBUF_ROTATE_NONE
                                             : angle ==  90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
                                             : angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
                                             : angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
                                             : angle);
        OUTPUT:
        RETVAL

GdkPixbuf_noinc *
load_jpeg (SV *path, int thumbnail=0)
        CODE:
{
        struct jpeg_decompress_struct cinfo;
        struct jpg_err_mgr jerr;
        guchar *data;
        int rs;
        FILE *fp;
        volatile GdkPixbuf *pb = 0;

        RETVAL = 0;

        fp = fopen (SvPVbyte_nolen (path), "rb");

        if (!fp)
          XSRETURN_UNDEF;

        cinfo.err = jpeg_std_error (&jerr.err);

        jerr.err.error_exit     = cv_error_exit;
        jerr.err.output_message = cv_error_output;

        if ((rs = setjmp (jerr.setjmp_buffer)))
          {
            fclose (fp);
            jpeg_destroy_decompress (&cinfo);

            if (pb)
              g_object_unref ((gpointer)pb);

            XSRETURN_UNDEF;
          }

        jpeg_create_decompress (&cinfo);

        jpeg_stdio_src (&cinfo, fp);
        jpeg_read_header (&cinfo, TRUE);

        cinfo.dct_method          = JDCT_DEFAULT;
        cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
        cinfo.do_block_smoothing  = FALSE;
        cinfo.out_color_space     = JCS_RGB;
        cinfo.quantize_colors     = FALSE;

        cinfo.scale_num   = 1;
        cinfo.scale_denom = 1;

        jpeg_calc_output_dimensions (&cinfo);

        if (thumbnail)
          {
            cinfo.dct_method          = JDCT_FASTEST;
            cinfo.do_fancy_upsampling = FALSE;

            while (cinfo.scale_denom < 8
                   && cinfo.output_width  >= IW*4
                   && cinfo.output_height >= IH*4)
              {
                cinfo.scale_denom <<= 1;
                jpeg_calc_output_dimensions (&cinfo);
              }
          }

        pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8,  cinfo.output_width, cinfo.output_height);
        if (!RETVAL)
          longjmp (jerr.setjmp_buffer, 2);

        data = gdk_pixbuf_get_pixels (RETVAL);
        rs = gdk_pixbuf_get_rowstride (RETVAL);

        if (cinfo.output_components != 3)
          longjmp (jerr.setjmp_buffer, 3);

        jpeg_start_decompress (&cinfo);

        while (cinfo.output_scanline < cinfo.output_height)
          {
            int remaining = cinfo.output_height - cinfo.output_scanline;
            JSAMPROW rp[4];

            rp [0] = data + cinfo.output_scanline * rs;
            rp [1] = (guchar *)rp [0] + rs;
            rp [2] = (guchar *)rp [1] + rs;
            rp [3] = (guchar *)rp [2] + rs;

            jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
          }

        jpeg_finish_decompress (&cinfo);
        fclose (fp);
        jpeg_destroy_decompress (&cinfo);
}
        OUTPUT:
        RETVAL

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

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

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

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:	1.32
Committed:	Wed Feb 15 08:36:55 2006 UTC (18 years, 3 months ago) by root
Branch:	MAIN
Changes since 1.31:	+21 -0 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 <magic.h>
9
10	#include <jpeglib.h>
11	#include <glib.h>
12	#include <gtk/gtk.h>
13	#include <gdk-pixbuf/gdk-pixbuf.h>
14
15	#include <gperl.h>
16	#include <gtk2perl.h>
17
18	#define IW 80 /* MUST match Schnauer.pm! */
19	#define IH 60 /* MUST match Schnauer.pm! */
20
21	#define RAND (seed = (seed + 7141) * 54773 % 134456)
22
23	#define LINELENGTH 240
24
25	#define ELLIPSIS "\xe2\x80\xa6"
26
27	struct jpg_err_mgr
28	{
29	struct jpeg_error_mgr err;
30	jmp_buf setjmp_buffer;
31	};
32
33	static void
34	cv_error_exit (j_common_ptr cinfo)
35	{
36	longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
37	}
38
39	static void
40	cv_error_output (j_common_ptr cinfo)
41	{
42	return;
43	}
44
45	static void
46	rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
47	unsigned int h, unsigned int s, unsigned int *v)
48	{
49	unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
50	unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
51	unsigned int delta = mx - mn;
52
53	*v = mx;
54
55	s = mx ? delta 255 / mx : 0;
56
57	if (delta == 0)
58	*h = 0;
59	else
60	{
61	if (r == mx)
62	h = ((int)g - (int)b) 255 / (int)(delta * 3);
63	else if (g == mx)
64	h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
65	else if (b == mx)
66	h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
67
68	*h &= 255;
69	}
70	}
71
72	static guint32 a85_val;
73	static guint a85_cnt;
74	static guchar a85_buf[LINELENGTH], *a85_ptr;
75
76	static void
77	a85_init (void)
78	{
79	a85_cnt = 4;
80	a85_ptr = a85_buf;
81	}
82
83	static void
84	a85_push (PerlIO *fp, guchar c)
85	{
86	a85_val = a85_val << 8 \| c;
87
88	if (!--a85_cnt)
89	{
90	a85_cnt = 4;
91	if (a85_val)
92	{
93	a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
94	a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
95	a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
96	a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
97	a85_ptr[0] = (a85_val ) + 33;
98
99	a85_ptr += 5;
100	}
101	else
102	*a85_ptr++ = 'z';
103
104	if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
105	{
106	*a85_ptr++ = '\n';
107	PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
108	a85_ptr = a85_buf;
109	}
110	}
111
112	}
113
114	static void
115	a85_finish (PerlIO *fp)
116	{
117	while (a85_cnt != 4)
118	a85_push (fp, 0);
119
120	*a85_ptr++ = '~'; // probably buggy end-marker
121	*a85_ptr++ = '>'; // probably buggy end-marker
122	*a85_ptr++ = '\n';
123
124	PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
125	}
126
127	/////////////////////////////////////////////////////////////////////////////
128
129	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
130
131	PROTOTYPES: ENABLE
132
133	# missing function in perl. really :)
134	int
135	common_prefix_length (a, b)
136	unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
137	unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
138	CODE:
139	RETVAL = 0;
140
141	while (a == b && *a)
142	{
143	RETVAL += (*a & 0xc0) != 0x80;
144	a++, b++;
145	}
146
147	OUTPUT:
148	RETVAL
149
150	const char *
151	magic (const char *path)
152	CODE:
153	{
154	static magic_t cookie;
155
156	if (!cookie)
157	{
158	cookie = magic_open (MAGIC_NONE);
159
160	if (cookie)
161	magic_load (cookie, 0);
162	else
163	XSRETURN_UNDEF;
164	}
165
166	RETVAL = magic_file (cookie, path);
167	}
168	OUTPUT:
169	RETVAL
170
171	const char *
172	magic_mime (const char *path)
173	CODE:
174	{
175	static magic_t cookie;
176
177	if (!cookie)
178	{
179	cookie = magic_open (MAGIC_MIME);
180
181	if (cookie)
182	magic_load (cookie, 0);
183	else
184	XSRETURN_UNDEF;
185	}
186
187	RETVAL = magic_file (cookie, path);
188	}
189	OUTPUT:
190	RETVAL
191
192	# missing in Gtk2 perl module
193
194	gboolean
195	gdk_net_wm_supports (GdkAtom property)
196	CODE:
197	#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
198	RETVAL = gdk_net_wm_supports (property);
199	#else
200	RETVAL = 0;
201	#endif
202	OUTPUT:
203	RETVAL
204
205	GdkPixbuf_noinc *
206	dealpha_expose (GdkPixbuf *pb)
207	CODE:
208	{
209	int w = gdk_pixbuf_get_width (pb);
210	int h = gdk_pixbuf_get_height (pb);
211	int bpp = gdk_pixbuf_get_n_channels (pb);
212	int x, y, i;
213	guchar src = gdk_pixbuf_get_pixels (pb), dst;
214	int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
215
216	RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
217
218	dst = gdk_pixbuf_get_pixels (RETVAL);
219	dstr = gdk_pixbuf_get_rowstride (RETVAL);
220
221	for (x = 0; x < w; x++)
222	for (y = 0; y < h; y++)
223	for (i = 0; i < 3; i++)
224	dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
225	}
226	OUTPUT:
227	RETVAL
228
229	GdkPixbuf_noinc *
230	rotate (GdkPixbuf *pb, int angle)
231	CODE:
232	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
233	: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
234	: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
235	: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
236	: angle);
237	OUTPUT:
238	RETVAL
239
240	GdkPixbuf_noinc *
241	load_jpeg (SV *path, int thumbnail=0)
242	CODE:
243	{
244	struct jpeg_decompress_struct cinfo;
245	struct jpg_err_mgr jerr;
246	guchar *data;
247	int rs;
248	FILE *fp;
249	volatile GdkPixbuf *pb = 0;
250
251	RETVAL = 0;
252
253	fp = fopen (SvPVbyte_nolen (path), "rb");
254
255	if (!fp)
256	XSRETURN_UNDEF;
257
258	cinfo.err = jpeg_std_error (&jerr.err);
259
260	jerr.err.error_exit = cv_error_exit;
261	jerr.err.output_message = cv_error_output;
262
263	if ((rs = setjmp (jerr.setjmp_buffer)))
264	{
265	fclose (fp);
266	jpeg_destroy_decompress (&cinfo);
267
268	if (pb)
269	g_object_unref ((gpointer)pb);
270
271	XSRETURN_UNDEF;
272	}
273
274	jpeg_create_decompress (&cinfo);
275
276	jpeg_stdio_src (&cinfo, fp);
277	jpeg_read_header (&cinfo, TRUE);
278
279	cinfo.dct_method = JDCT_DEFAULT;
280	cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
281	cinfo.do_block_smoothing = FALSE;
282	cinfo.out_color_space = JCS_RGB;
283	cinfo.quantize_colors = FALSE;
284
285	cinfo.scale_num = 1;
286	cinfo.scale_denom = 1;
287
288	jpeg_calc_output_dimensions (&cinfo);
289
290	if (thumbnail)
291	{
292	cinfo.dct_method = JDCT_FASTEST;
293	cinfo.do_fancy_upsampling = FALSE;
294
295	while (cinfo.scale_denom < 8
296	&& cinfo.output_width >= IW*4
297	&& cinfo.output_height >= IH*4)
298	{
299	cinfo.scale_denom <<= 1;
300	jpeg_calc_output_dimensions (&cinfo);
301	}
302	}
303
304	pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
305	if (!RETVAL)
306	longjmp (jerr.setjmp_buffer, 2);
307
308	data = gdk_pixbuf_get_pixels (RETVAL);
309	rs = gdk_pixbuf_get_rowstride (RETVAL);
310
311	if (cinfo.output_components != 3)
312	longjmp (jerr.setjmp_buffer, 3);
313
314	jpeg_start_decompress (&cinfo);
315
316	while (cinfo.output_scanline < cinfo.output_height)
317	{
318	int remaining = cinfo.output_height - cinfo.output_scanline;
319	JSAMPROW rp[4];
320
321	rp [0] = data + cinfo.output_scanline * rs;
322	rp [1] = (guchar *)rp [0] + rs;
323	rp [2] = (guchar *)rp [1] + rs;
324	rp [3] = (guchar *)rp [2] + rs;
325
326	jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
327	}
328
329	jpeg_finish_decompress (&cinfo);
330	fclose (fp);
331	jpeg_destroy_decompress (&cinfo);
332	}
333	OUTPUT:
334	RETVAL
335
336	#############################################################################
337
338	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
339
340	SV *
341	foldcase (SV *pathsv)
342	PROTOTYPE: $
343	CODE:
344	{
345	STRLEN plen;
346	U8 path = (U8 )SvPVutf8 (pathsv, plen);
347	U8 *pend = path + plen;
348	U8 dst [plen * 6 * 3], *dstp = dst;
349
350	while (path < pend)
351	{
352	U8 ch = *path;
353
354	if (ch >= 'a' && ch <= 'z')
355	dstp++ = path++;
356	else if (ch >= '0' && ch <= '9')
357	{
358	STRLEN el, nl = 0;
359	while (path >= '0' && path <= '9' && path < pend)
360	path++, nl++;
361
362	for (el = nl; el < 6; el++)
363	*dstp++ = '0';
364
365	memcpy (dstp, path - nl, nl);
366	dstp += nl;
367	}
368	else
369	{
370	STRLEN cl;
371	to_utf8_fold (path, dstp, &cl);
372	dstp += cl;
373	path += is_utf8_char (path);
374	}
375	}
376
377	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
378	}
379	OUTPUT:
380	RETVAL
381
382	GdkPixbuf_noinc *
383	p7_to_pb (int w, int h, SV *src_sv)
384	PROTOTYPE: @
385	CODE:
386	{
387	int x, y;
388	guchar dst, d;
389	int dstr;
390	guchar src = (guchar )SvPVbyte_nolen (src_sv);
391
392	RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
393	dst = gdk_pixbuf_get_pixels (RETVAL);
394	dstr = gdk_pixbuf_get_rowstride (RETVAL);
395
396	for (y = 0; y < h; y++)
397	for (d = dst + y * dstr, x = 0; x < w; x++)
398	{
399	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
400	d++ = (((src >> 2) & 7) * 255 + 4) / 7;
401	d++ = (((src >> 0) & 3) * 255 + 2) / 3;
402
403	src++;
404	}
405	}
406	OUTPUT:
407	RETVAL
408
409	#############################################################################
410
411	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
412
413	void
414	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
415	CODE:
416	{
417	int w = gdk_pixbuf_get_width (pb);
418	int h = gdk_pixbuf_get_height (pb);
419	int x, y, i;
420	guchar *dst;
421	int bpp = gdk_pixbuf_get_n_channels (pb);
422	guchar *src = gdk_pixbuf_get_pixels (pb);
423	int sstr = gdk_pixbuf_get_rowstride (pb);
424
425	a85_init ();
426
427	for (y = 0; y < h; y++)
428	for (x = 0; x < w; x++)
429	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
430	a85_push (fp, src [x * bpp + y * sstr + i]);
431
432	a85_finish (fp);
433	}
434
435	void
436	dump_binary (PerlIO fp, GdkPixbuf pb)
437	CODE:
438	{
439	int w = gdk_pixbuf_get_width (pb);
440	int h = gdk_pixbuf_get_height (pb);
441	int x, y, i;
442	guchar *dst;
443	int bpp = gdk_pixbuf_get_n_channels (pb);
444	guchar *src = gdk_pixbuf_get_pixels (pb);
445	int sstr = gdk_pixbuf_get_rowstride (pb);
446
447	for (y = 0; y < h; y++)
448	for (x = 0; x < w; x++)
449	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
450	PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
451	}
452
453	#############################################################################
454
455	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
456
457	SV *
458	pb_to_hv84 (GdkPixbuf *pb)
459	CODE:
460	{
461	int w = gdk_pixbuf_get_width (pb);
462	int h = gdk_pixbuf_get_height (pb);
463	int x, y;
464	guchar *dst;
465	int bpp = gdk_pixbuf_get_n_channels (pb);
466	guchar *src = gdk_pixbuf_get_pixels (pb);
467	int sstr = gdk_pixbuf_get_rowstride (pb);
468
469	RETVAL = newSV (6 * 8 * 12 / 8);
470	SvPOK_only (RETVAL);
471	SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
472
473	dst = (guchar *)SvPVX (RETVAL);
474
475	/* some primitive error distribution + random dithering */
476
477	for (y = 0; y < h; y++)
478	{
479	guchar p = src + y sstr;
480
481	for (x = 0; x < w; x += 2)
482	{
483	unsigned int r, g, b, h, s, v, H, V1, V2;
484
485	if (bpp == 3)
486	r = p++, g = p++, b = *p++;
487	else if (bpp == 1)
488	r = g = b = *p++;
489	else
490	abort ();
491
492	rgb_to_hsv (r, g, b, &h, &s, &v);
493
494	H = (h * 15 / 255) << 4;
495	V1 = v;
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;
507	V2 = v;
508
509	*dst++ = H;
510	*dst++ = V1;
511	*dst++ = V2;
512	}
513	}
514	}
515	OUTPUT:
516	RETVAL
517
518	SV *
519	hv84_to_av (unsigned char *hv84)
520	CODE:
521	{
522	int i = 72 / 3;
523	AV *av = newAV ();
524
525	RETVAL = (SV )newRV_noinc ((SV )av);
526	while (i--)
527	{
528	int h = *hv84++;
529	int v1 = *hv84++;
530	int v2 = *hv84++;
531
532	av_push (av, newSViv (v1));
533	av_push (av, newSViv ((h >> 4) * 255 / 15));
534	av_push (av, newSViv (v2));
535	av_push (av, newSViv ((h & 15) * 255 / 15));
536	}
537	}
538	OUTPUT:
539	RETVAL
540
541	#############################################################################
542
543	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
544
545	SV *
546	make_histograms (SV *ar)
547	CODE:
548	{
549	int i;
550	AV av, result;
551
552	if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
553	croak ("Not an array ref as first argument to make_histogram");
554
555	av = (AV *) SvRV (ar);
556	result = newAV ();
557
558	for (i = 0; i <= av_len (av); ++i)
559	{
560	const int HISTSIZE = 64;
561
562	int j;
563	SV sv = av_fetch (av, i, 1);
564	STRLEN len;
565	char *buf = SvPVbyte (sv, len);
566
567	int tmphist[HISTSIZE];
568	float *hist;
569
570	SV histsv = newSV (HISTSIZE sizeof (float) + 1);
571	SvPOK_on (histsv);
572	SvCUR_set (histsv, HISTSIZE * sizeof (float));
573	hist = (float *)SvPVX (histsv);
574
575	Zero (tmphist, sizeof (tmphist), char);
576
577	for (j = len; j--; )
578	{
579	unsigned int idx
580	= ((*buf & 0xc0) >> 2)
581	\| ((*buf & 0x18) >> 1)
582	\| (*buf & 0x03);
583
584	++tmphist[idx];
585	++buf;
586	}
587
588	for (j = 0; j < HISTSIZE; ++j)
589	hist[j] = (float)tmphist[j] / (len + 1e-30);
590
591	av_push (result, histsv);
592	}
593
594	RETVAL = newRV_noinc ((SV *)result);
595	}
596	OUTPUT:
597	RETVAL
598
599