CV/CV.xs

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

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

#include <jpeglib.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

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 (char *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;

        if (!(fp = fopen (path, "rb")))
          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:	1.21
Committed:	Sat Jul 23 03:25:51 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.20:	+3 -2 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	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
10
11			#include <gperl.h>
12			#include <gtk2perl.h>
13
14	root	1.17	#define IW 80 /* MUST match Schnauer.pm! */
15			#define IH 60 /* MUST match Schnauer.pm! */
16	root	1.5
17			#define RAND (seed = (seed + 7141) * 54773 % 134456)
18
19	root	1.7	#define LINELENGTH 240
20
21	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
22
23	root	1.17	struct jpg_err_mgr
24			{
25			struct jpeg_error_mgr err;
26			jmp_buf setjmp_buffer;
27			};
28
29			static void
30			cv_error_exit (j_common_ptr cinfo)
31			{
32			longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
33			}
34
35			static void
36			cv_error_output (j_common_ptr cinfo)
37			{
38			return;
39			}
40
41			static void
42			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
43			unsigned int h, unsigned int s, unsigned int *v)
44			{
45			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
46			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
47			unsigned int delta = mx - mn;
48
49			*v = mx;
50
51			s = mx ? delta 255 / mx : 0;
52
53			if (delta == 0)
54			*h = 0;
55			else
56			{
57			if (r == mx)
58			h = ((int)g - (int)b) 255 / (int)(delta * 3);
59			else if (g == mx)
60			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
61			else if (b == mx)
62			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
63
64			*h &= 255;
65			}
66			}
67
68	root	1.4	static guint32 a85_val;
69			static guint a85_cnt;
70	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
71	root	1.4
72			static void
73			a85_init (void)
74			{
75			a85_cnt = 4;
76			a85_ptr = a85_buf;
77			}
78
79			static void
80			a85_push (PerlIO *fp, guchar c)
81			{
82			a85_val = a85_val << 8 \| c;
83
84			if (!--a85_cnt)
85			{
86			a85_cnt = 4;
87			if (a85_val)
88			{
89			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
90			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
91			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
92			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
93			a85_ptr[0] = (a85_val ) + 33;
94
95			a85_ptr += 5;
96			}
97			else
98			*a85_ptr++ = 'z';
99
100			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
101			{
102			*a85_ptr++ = '\n';
103			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
104			a85_ptr = a85_buf;
105			}
106			}
107
108			}
109
110	root	1.8	static void
111	root	1.4	a85_finish (PerlIO *fp)
112			{
113			while (a85_cnt != 4)
114			a85_push (fp, 0);
115
116			*a85_ptr++ = '~'; // probably buggy end-marker
117			*a85_ptr++ = '>'; // probably buggy end-marker
118			*a85_ptr++ = '\n';
119
120			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
121			}
122
123	root	1.6	/////////////////////////////////////////////////////////////////////////////
124
125	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
126	root	1.1
127			PROTOTYPES: ENABLE
128	root	1.2
129	root	1.3	GdkPixbuf_noinc *
130	root	1.2	transpose (GdkPixbuf *pb)
131			CODE:
132			{
133			int w = gdk_pixbuf_get_width (pb);
134			int h = gdk_pixbuf_get_height (pb);
135	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
136	root	1.2	int x, y, i;
137			guchar src = gdk_pixbuf_get_pixels (pb), dst;
138			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
139
140			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, h, w);
141
142			dst = gdk_pixbuf_get_pixels (RETVAL);
143			dstr = gdk_pixbuf_get_rowstride (RETVAL);
144
145	root	1.3	for (y = 0; y < h; y++)
146			for (x = 0; x < w; x++)
147	root	1.2	for (i = 0; i < bpp; i++)
148			dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i];
149			}
150			OUTPUT:
151			RETVAL
152
153	root	1.3	GdkPixbuf_noinc *
154	root	1.2	flop (GdkPixbuf *pb)
155			CODE:
156			{
157			int w = gdk_pixbuf_get_width (pb);
158			int h = gdk_pixbuf_get_height (pb);
159	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
160	root	1.2	int x, y, i;
161			guchar src = gdk_pixbuf_get_pixels (pb), dst;
162			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
163
164			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, w, h);
165
166			dst = gdk_pixbuf_get_pixels (RETVAL);
167			dstr = gdk_pixbuf_get_rowstride (RETVAL);
168
169	root	1.3	for (y = 0; y < h; y++)
170			for (x = 0; x < w; x++)
171	root	1.2	for (i = 0; i < bpp; i++)
172	root	1.4	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
173	root	1.2	}
174			OUTPUT:
175			RETVAL
176
177	root	1.17	GdkPixbuf_noinc *
178			load_jpeg (char *path, int thumbnail=0)
179			CODE:
180			{
181			struct jpeg_decompress_struct cinfo;
182			struct jpg_err_mgr jerr;
183			guchar *data;
184			int rs;
185			FILE *fp;
186			volatile GdkPixbuf *pb = 0;
187			RETVAL = 0;
188
189			if (!(fp = fopen (path, "rb")))
190			XSRETURN_UNDEF;
191
192			cinfo.err = jpeg_std_error (&jerr.err);
193
194			jerr.err.error_exit = cv_error_exit;
195			jerr.err.output_message = cv_error_output;
196
197			if ((rs = setjmp (jerr.setjmp_buffer)))
198			{
199			fclose (fp);
200			jpeg_destroy_decompress (&cinfo);
201
202			if (pb)
203			g_object_unref ((gpointer)pb);
204
205			XSRETURN_UNDEF;
206			}
207
208			jpeg_create_decompress (&cinfo);
209
210			jpeg_stdio_src (&cinfo, fp);
211			jpeg_read_header (&cinfo, TRUE);
212
213			cinfo.dct_method = JDCT_DEFAULT;
214			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
215			cinfo.do_block_smoothing = FALSE;
216			cinfo.out_color_space = JCS_RGB;
217			cinfo.quantize_colors = FALSE;
218
219			cinfo.scale_num = 1;
220			cinfo.scale_denom = 1;
221
222			jpeg_calc_output_dimensions (&cinfo);
223
224			if (thumbnail)
225			{
226			cinfo.dct_method = JDCT_FASTEST;
227			cinfo.do_fancy_upsampling = FALSE;
228
229			while (cinfo.scale_denom < 8
230	root	1.21	&& cinfo.output_width >= IW*4
231			&& cinfo.output_height >= IH*4)
232	root	1.17	{
233			cinfo.scale_denom <<= 1;
234			jpeg_calc_output_dimensions (&cinfo);
235			}
236			}
237
238			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
239			if (!RETVAL)
240			longjmp (jerr.setjmp_buffer, 2);
241
242			data = gdk_pixbuf_get_pixels (RETVAL);
243			rs = gdk_pixbuf_get_rowstride (RETVAL);
244
245			if (cinfo.output_components != 3)
246			longjmp (jerr.setjmp_buffer, 3);
247
248			jpeg_start_decompress (&cinfo);
249
250			while (cinfo.output_scanline < cinfo.output_height)
251			{
252			int remaining = cinfo.output_height - cinfo.output_scanline;
253			JSAMPROW rp[4];
254
255			rp [0] = data + cinfo.output_scanline * rs;
256			rp [1] = (guchar *)rp [0] + rs;
257			rp [2] = (guchar *)rp [1] + rs;
258			rp [3] = (guchar *)rp [2] + rs;
259
260			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
261			}
262
263			jpeg_finish_decompress (&cinfo);
264			fclose (fp);
265			jpeg_destroy_decompress (&cinfo);
266			}
267			OUTPUT:
268			RETVAL
269
270	root	1.6	#############################################################################
271
272	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
273
274	root	1.18	SV *
275			foldcase (SV *pathsv)
276			PROTOTYPE: $
277			CODE:
278			{
279			STRLEN plen;
280			U8 *path = SvPVutf8 (pathsv, plen);
281			U8 *pend = path + plen;
282			U8 dst [plen * 6 * 3], *dstp = dst;
283
284			while (path < pend)
285			{
286	root	1.19	U8 ch = *path;
287
288			if (ch >= 'a' && ch <= 'z')
289			dstp++ = path++;
290			else if (ch >= '0' && ch <= '9')
291	root	1.18	{
292			STRLEN el, nl = 0;
293	root	1.19	while (path >= '0' && path <= '9' && path < pend)
294	root	1.18	path++, nl++;
295
296			for (el = nl; el < 6; el++)
297			*dstp++ = '0';
298
299			memcpy (dstp, path - nl, nl);
300			dstp += nl;
301			}
302			else
303			{
304			STRLEN cl;
305			to_utf8_fold (path, dstp, &cl);
306			dstp += cl;
307			path += is_utf8_char (path);
308			}
309			}
310
311			RETVAL = newSVpvn (dst, dstp - dst);
312			}
313			OUTPUT:
314			RETVAL
315
316	root	1.3	GdkPixbuf_noinc *
317	root	1.2	p7_to_pb (int w, int h, guchar *src)
318	root	1.21	PROTOTYPE: @
319	root	1.2	CODE:
320			{
321			int x, y;
322			guchar dst, d;
323			int dstr;
324
325			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
326			dst = gdk_pixbuf_get_pixels (RETVAL);
327			dstr = gdk_pixbuf_get_rowstride (RETVAL);
328
329			for (y = 0; y < h; y++)
330			for (d = dst + y * dstr, x = 0; x < w; x++)
331			{
332	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
333			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
334			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
335	root	1.2
336			src++;
337			}
338	root	1.3	}
339			OUTPUT:
340			RETVAL
341
342			SV *
343			pb_to_p7 (GdkPixbuf *pb)
344			CODE:
345			{
346			int w = gdk_pixbuf_get_width (pb);
347			int h = gdk_pixbuf_get_height (pb);
348			int x, y;
349			guchar *dst;
350	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
351	root	1.3	guchar *src = gdk_pixbuf_get_pixels (pb);
352			int sstr = gdk_pixbuf_get_rowstride (pb);
353	root	1.5	int Er[IW], Eg[IW], Eb[IW];
354			int seed = 77;
355	root	1.3
356			RETVAL = newSV (w * h);
357			SvPOK_only (RETVAL);
358			SvCUR_set (RETVAL, w * h);
359
360			dst = SvPVX (RETVAL);
361
362	root	1.5	memset (Er, 0, sizeof (int) * IW);
363			memset (Eg, 0, sizeof (int) * IW);
364			memset (Eb, 0, sizeof (int) * IW);
365
366			/* some primitive error distribution + random dithering */
367
368	root	1.3	for (y = 0; y < h; y++)
369			{
370			int er = 0, eg = 0, eb = 0;
371
372			for (x = 0; x < w; x++)
373			{
374			int r, g, b;
375			guchar p = src + x bpp + y * sstr;
376
377	root	1.17	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
378			g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
379			b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
380	root	1.3
381			r = r > 7 ? 7 : r < 0 ? 0 : r;
382			g = g > 7 ? 7 : g < 0 ? 0 : g;
383			b = b > 3 ? 3 : b < 0 ? 0 : b;
384
385			er += p[0] - (r * 255 + 4) / 7;
386			eg += p[1] - (g * 255 + 4) / 7;
387			eb += p[2] - (b * 255 + 2) / 3;
388	root	1.5
389	root	1.17	Er[x] = er >> 1; er -= (er + 1) >> 1;
390			Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
391			Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
392	root	1.3
393			*dst++ = r << 5 \| g << 2 \| b;
394			}
395			}
396	root	1.2	}
397			OUTPUT:
398			RETVAL
399	root	1.6
400			#############################################################################
401	root	1.4
402			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
403
404			void
405	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
406	root	1.4	CODE:
407			{
408			int w = gdk_pixbuf_get_width (pb);
409			int h = gdk_pixbuf_get_height (pb);
410			int x, y, i;
411			guchar *dst;
412	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
413	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
414			int sstr = gdk_pixbuf_get_rowstride (pb);
415
416			a85_init ();
417
418			for (y = 0; y < h; y++)
419			for (x = 0; x < w; x++)
420	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
421	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
422
423			a85_finish (fp);
424	root	1.7	}
425
426			void
427			dump_binary (PerlIO fp, GdkPixbuf pb)
428			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			int bpp = gdk_pixbuf_get_n_channels (pb);
435			guchar *src = gdk_pixbuf_get_pixels (pb);
436			int sstr = gdk_pixbuf_get_rowstride (pb);
437
438			for (y = 0; y < h; y++)
439			for (x = 0; x < w; x++)
440			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
441			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
442	root	1.4	}
443	root	1.8
444			#############################################################################
445
446			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
447
448			SV *
449			pb_to_hv84 (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;
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			RETVAL = newSV (6 * 8 * 12 / 8);
461			SvPOK_only (RETVAL);
462			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
463
464			dst = SvPVX (RETVAL);
465
466			/* some primitive error distribution + random dithering */
467
468			for (y = 0; y < h; y++)
469			{
470			guchar p = src + y sstr;
471
472			for (x = 0; x < w; x += 2)
473			{
474			unsigned int r, g, b, h, s, v, H, V1, V2;
475
476			if (bpp == 3)
477			r = p++, g = p++, b = *p++;
478			else if (bpp == 1)
479			r = g = b = *p++;
480			else
481			abort ();
482
483			rgb_to_hsv (r, g, b, &h, &s, &v);
484
485			H = (h * 15 / 255) << 4;
486			V1 = v;
487
488			if (bpp == 3)
489			r = p++, g = p++, b = *p++;
490			else if (bpp == 1)
491			r = g = b = *p++;
492			else
493			abort ();
494
495			rgb_to_hsv (r, g, b, &h, &s, &v);
496
497			H \|= h * 15 / 255;
498			V2 = v;
499
500			*dst++ = H;
501			*dst++ = V1;
502			*dst++ = V2;
503			}
504			}
505			}
506			OUTPUT:
507			RETVAL
508	root	1.4
509	root	1.9	SV *
510			hv84_to_av (unsigned char *hv84)
511			CODE:
512			{
513			int i = 72 / 3;
514			AV *av = newAV ();
515
516			RETVAL = (SV )newRV_noinc ((SV )av);
517			while (i--)
518			{
519			int h = *hv84++;
520			int v1 = *hv84++;
521			int v2 = *hv84++;
522
523			av_push (av, newSViv (v1));
524			av_push (av, newSViv ((h >> 4) * 255 / 15));
525			av_push (av, newSViv (v2));
526			av_push (av, newSViv ((h & 15) * 255 / 15));
527			}
528			}
529			OUTPUT:
530			RETVAL
531	root	1.2
532	root	1.20	#############################################################################
533
534			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
535
536			SV *
537			make_histograms (SV *ar)
538			CODE:
539			{
540			int i;
541			AV av, result;
542
543			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
544			croak ("Not an array ref as first argument to make_histogram");
545
546			av = (AV *) SvRV (ar);
547			result = newAV ();
548
549			for (i = 0; i <= av_len (av); ++i)
550			{
551			const int HISTSIZE = 64;
552
553			int j;
554			SV sv = av_fetch (av, i, 1);
555			STRLEN len;
556			char *buf = SvPVbyte (sv, len);
557
558			int tmphist[HISTSIZE];
559			float *hist;
560
561			SV histsv = newSV (HISTSIZE sizeof (float) + 1);
562			SvPOK_on (histsv);
563			SvCUR_set (histsv, HISTSIZE * sizeof (float));
564			hist = (float *)SvPVX (histsv);
565
566			Zero (tmphist, sizeof (tmphist), char);
567
568			for (j = len; j--; )
569			{
570			unsigned int idx
571			= ((*buf & 0xc0) >> 2)
572			\| ((*buf & 0x18) >> 1)
573			\| (*buf & 0x03);
574
575			++tmphist[idx];
576			++buf;
577			}
578
579			for (j = 0; j < HISTSIZE; ++j)
580			hist[j] = (float)tmphist[j] / (len + 1e-30);
581
582			av_push (result, histsv);
583			}
584
585			RETVAL = newRV_noinc ((SV *)result);
586			}
587			OUTPUT:
588			RETVAL
589	root	1.1
590