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 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

# 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;
        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

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

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:	1.29
Committed:	Sat Sep 24 01:25:17 2005 UTC (18 years, 7 months ago) by root
Branch:	MAIN
CVS Tags:	rel-1_1
Changes since 1.28:	+17 -0 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	1.29	# missing function in perl. really :)
132			int
133			common_prefix_length (a, b)
134			unsigned char a = (unsigned char )SvPVutf8_nolen ($arg);
135			unsigned char b = (unsigned char )SvPVutf8_nolen ($arg);
136			CODE:
137			RETVAL = 0;
138
139			while (a == b && *a)
140			{
141			RETVAL += (*a & 0xc0) != 0x80;
142			a++, b++;
143			}
144
145			OUTPUT:
146			RETVAL
147
148	root	1.22	# missing in Gtk2 perl module
149
150			gboolean
151			gdk_net_wm_supports (GdkAtom property)
152			CODE:
153			#if defined(GDK_WINDOWING_X11) && !defined(GDK_MULTIHEAD_SAFE)
154			RETVAL = gdk_net_wm_supports (property);
155			#else
156			RETVAL = 0;
157			#endif
158			OUTPUT:
159			RETVAL
160
161	root	1.3	GdkPixbuf_noinc *
162	root	1.26	dealpha_expose (GdkPixbuf *pb)
163			CODE:
164			{
165			int w = gdk_pixbuf_get_width (pb);
166			int h = gdk_pixbuf_get_height (pb);
167			int bpp = gdk_pixbuf_get_n_channels (pb);
168			int x, y, i;
169			guchar src = gdk_pixbuf_get_pixels (pb), dst;
170			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
171
172			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
173
174			dst = gdk_pixbuf_get_pixels (RETVAL);
175			dstr = gdk_pixbuf_get_rowstride (RETVAL);
176
177			for (x = 0; x < w; x++)
178			for (y = 0; y < h; y++)
179			for (i = 0; i < 3; i++)
180			dst[x * 3 + y * dstr + i] = src[x * bpp + y * sstr + i];
181			}
182			OUTPUT:
183			RETVAL
184
185			GdkPixbuf_noinc *
186	root	1.28	rotate (GdkPixbuf *pb, int angle)
187	root	1.2	CODE:
188	root	1.28	RETVAL = gdk_pixbuf_rotate_simple (pb, angle == 0 ? GDK_PIXBUF_ROTATE_NONE
189			: angle == 90 ? GDK_PIXBUF_ROTATE_COUNTERCLOCKWISE
190			: angle == 180 ? GDK_PIXBUF_ROTATE_UPSIDEDOWN
191			: angle == 270 ? GDK_PIXBUF_ROTATE_CLOCKWISE
192			: angle);
193	root	1.2	OUTPUT:
194			RETVAL
195
196	root	1.17	GdkPixbuf_noinc *
197	root	1.23	load_jpeg (SV *path, int thumbnail=0)
198	root	1.17	CODE:
199			{
200			struct jpeg_decompress_struct cinfo;
201			struct jpg_err_mgr jerr;
202			guchar *data;
203			int rs;
204			FILE *fp;
205			volatile GdkPixbuf *pb = 0;
206	root	1.23	gchar *filename;
207
208	root	1.17	RETVAL = 0;
209
210	root	1.23	filename = g_filename_from_utf8 (SvPVutf8_nolen (path), -1, 0, 0, 0);
211			fp = fopen (filename, "rb");
212			g_free (filename);
213
214			if (!fp)
215	root	1.17	XSRETURN_UNDEF;
216
217			cinfo.err = jpeg_std_error (&jerr.err);
218
219			jerr.err.error_exit = cv_error_exit;
220			jerr.err.output_message = cv_error_output;
221
222			if ((rs = setjmp (jerr.setjmp_buffer)))
223			{
224			fclose (fp);
225			jpeg_destroy_decompress (&cinfo);
226
227			if (pb)
228			g_object_unref ((gpointer)pb);
229
230			XSRETURN_UNDEF;
231			}
232
233			jpeg_create_decompress (&cinfo);
234
235			jpeg_stdio_src (&cinfo, fp);
236			jpeg_read_header (&cinfo, TRUE);
237
238			cinfo.dct_method = JDCT_DEFAULT;
239			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
240			cinfo.do_block_smoothing = FALSE;
241			cinfo.out_color_space = JCS_RGB;
242			cinfo.quantize_colors = FALSE;
243
244			cinfo.scale_num = 1;
245			cinfo.scale_denom = 1;
246
247			jpeg_calc_output_dimensions (&cinfo);
248
249			if (thumbnail)
250			{
251			cinfo.dct_method = JDCT_FASTEST;
252			cinfo.do_fancy_upsampling = FALSE;
253
254			while (cinfo.scale_denom < 8
255	root	1.21	&& cinfo.output_width >= IW*4
256			&& cinfo.output_height >= IH*4)
257	root	1.17	{
258			cinfo.scale_denom <<= 1;
259			jpeg_calc_output_dimensions (&cinfo);
260			}
261			}
262
263			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
264			if (!RETVAL)
265			longjmp (jerr.setjmp_buffer, 2);
266
267			data = gdk_pixbuf_get_pixels (RETVAL);
268			rs = gdk_pixbuf_get_rowstride (RETVAL);
269
270			if (cinfo.output_components != 3)
271			longjmp (jerr.setjmp_buffer, 3);
272
273			jpeg_start_decompress (&cinfo);
274
275			while (cinfo.output_scanline < cinfo.output_height)
276			{
277			int remaining = cinfo.output_height - cinfo.output_scanline;
278			JSAMPROW rp[4];
279
280			rp [0] = data + cinfo.output_scanline * rs;
281			rp [1] = (guchar *)rp [0] + rs;
282			rp [2] = (guchar *)rp [1] + rs;
283			rp [3] = (guchar *)rp [2] + rs;
284
285			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
286			}
287
288			jpeg_finish_decompress (&cinfo);
289			fclose (fp);
290			jpeg_destroy_decompress (&cinfo);
291			}
292			OUTPUT:
293			RETVAL
294
295	root	1.6	#############################################################################
296
297	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
298
299	root	1.18	SV *
300			foldcase (SV *pathsv)
301			PROTOTYPE: $
302			CODE:
303			{
304			STRLEN plen;
305	root	1.25	U8 path = (U8 )SvPVutf8 (pathsv, plen);
306	root	1.18	U8 *pend = path + plen;
307			U8 dst [plen * 6 * 3], *dstp = dst;
308
309			while (path < pend)
310			{
311	root	1.19	U8 ch = *path;
312
313			if (ch >= 'a' && ch <= 'z')
314			dstp++ = path++;
315			else if (ch >= '0' && ch <= '9')
316	root	1.18	{
317			STRLEN el, nl = 0;
318	root	1.19	while (path >= '0' && path <= '9' && path < pend)
319	root	1.18	path++, nl++;
320
321			for (el = nl; el < 6; el++)
322			*dstp++ = '0';
323
324			memcpy (dstp, path - nl, nl);
325			dstp += nl;
326			}
327			else
328			{
329			STRLEN cl;
330			to_utf8_fold (path, dstp, &cl);
331			dstp += cl;
332			path += is_utf8_char (path);
333			}
334			}
335
336	root	1.25	RETVAL = newSVpvn ((const char *)dst, dstp - dst);
337	root	1.18	}
338			OUTPUT:
339			RETVAL
340
341	root	1.3	GdkPixbuf_noinc *
342	root	1.24	p7_to_pb (int w, int h, SV *src_sv)
343	root	1.21	PROTOTYPE: @
344	root	1.2	CODE:
345			{
346			int x, y;
347			guchar dst, d;
348			int dstr;
349	root	1.25	guchar src = (guchar )SvPVbyte_nolen (src_sv);
350	root	1.2
351			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
352			dst = gdk_pixbuf_get_pixels (RETVAL);
353			dstr = gdk_pixbuf_get_rowstride (RETVAL);
354
355			for (y = 0; y < h; y++)
356			for (d = dst + y * dstr, x = 0; x < w; x++)
357			{
358	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
359			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
360			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
361	root	1.2
362			src++;
363			}
364	root	1.3	}
365			OUTPUT:
366			RETVAL
367
368	root	1.6	#############################################################################
369	root	1.4
370			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
371
372			void
373	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
374	root	1.4	CODE:
375			{
376			int w = gdk_pixbuf_get_width (pb);
377			int h = gdk_pixbuf_get_height (pb);
378			int x, y, i;
379			guchar *dst;
380	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
381	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
382			int sstr = gdk_pixbuf_get_rowstride (pb);
383
384			a85_init ();
385
386			for (y = 0; y < h; y++)
387			for (x = 0; x < w; x++)
388	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
389	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
390
391			a85_finish (fp);
392	root	1.7	}
393
394			void
395			dump_binary (PerlIO fp, GdkPixbuf pb)
396			CODE:
397			{
398			int w = gdk_pixbuf_get_width (pb);
399			int h = gdk_pixbuf_get_height (pb);
400			int x, y, i;
401			guchar *dst;
402			int bpp = gdk_pixbuf_get_n_channels (pb);
403			guchar *src = gdk_pixbuf_get_pixels (pb);
404			int sstr = gdk_pixbuf_get_rowstride (pb);
405
406			for (y = 0; y < h; y++)
407			for (x = 0; x < w; x++)
408			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
409			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
410	root	1.4	}
411	root	1.8
412			#############################################################################
413
414			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
415
416			SV *
417			pb_to_hv84 (GdkPixbuf *pb)
418			CODE:
419			{
420			int w = gdk_pixbuf_get_width (pb);
421			int h = gdk_pixbuf_get_height (pb);
422			int x, y;
423			guchar *dst;
424			int bpp = gdk_pixbuf_get_n_channels (pb);
425			guchar *src = gdk_pixbuf_get_pixels (pb);
426			int sstr = gdk_pixbuf_get_rowstride (pb);
427
428			RETVAL = newSV (6 * 8 * 12 / 8);
429			SvPOK_only (RETVAL);
430			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
431
432	root	1.25	dst = (guchar *)SvPVX (RETVAL);
433	root	1.8
434			/* some primitive error distribution + random dithering */
435
436			for (y = 0; y < h; y++)
437			{
438			guchar p = src + y sstr;
439
440			for (x = 0; x < w; x += 2)
441			{
442			unsigned int r, g, b, h, s, v, H, V1, V2;
443
444			if (bpp == 3)
445			r = p++, g = p++, b = *p++;
446			else if (bpp == 1)
447			r = g = b = *p++;
448			else
449			abort ();
450
451			rgb_to_hsv (r, g, b, &h, &s, &v);
452
453			H = (h * 15 / 255) << 4;
454			V1 = v;
455
456			if (bpp == 3)
457			r = p++, g = p++, b = *p++;
458			else if (bpp == 1)
459			r = g = b = *p++;
460			else
461			abort ();
462
463			rgb_to_hsv (r, g, b, &h, &s, &v);
464
465			H \|= h * 15 / 255;
466			V2 = v;
467
468			*dst++ = H;
469			*dst++ = V1;
470			*dst++ = V2;
471			}
472			}
473			}
474			OUTPUT:
475			RETVAL
476	root	1.4
477	root	1.9	SV *
478			hv84_to_av (unsigned char *hv84)
479			CODE:
480			{
481			int i = 72 / 3;
482			AV *av = newAV ();
483
484			RETVAL = (SV )newRV_noinc ((SV )av);
485			while (i--)
486			{
487			int h = *hv84++;
488			int v1 = *hv84++;
489			int v2 = *hv84++;
490
491			av_push (av, newSViv (v1));
492			av_push (av, newSViv ((h >> 4) * 255 / 15));
493			av_push (av, newSViv (v2));
494			av_push (av, newSViv ((h & 15) * 255 / 15));
495			}
496			}
497			OUTPUT:
498			RETVAL
499	root	1.2
500	root	1.20	#############################################################################
501
502			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Plugin::RCluster
503
504			SV *
505			make_histograms (SV *ar)
506			CODE:
507			{
508			int i;
509			AV av, result;
510
511			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
512			croak ("Not an array ref as first argument to make_histogram");
513
514			av = (AV *) SvRV (ar);
515			result = newAV ();
516
517			for (i = 0; i <= av_len (av); ++i)
518			{
519			const int HISTSIZE = 64;
520
521			int j;
522			SV sv = av_fetch (av, i, 1);
523			STRLEN len;
524			char *buf = SvPVbyte (sv, len);
525
526			int tmphist[HISTSIZE];
527			float *hist;
528
529			SV histsv = newSV (HISTSIZE sizeof (float) + 1);
530			SvPOK_on (histsv);
531			SvCUR_set (histsv, HISTSIZE * sizeof (float));
532			hist = (float *)SvPVX (histsv);
533
534			Zero (tmphist, sizeof (tmphist), char);
535
536			for (j = len; j--; )
537			{
538			unsigned int idx
539			= ((*buf & 0xc0) >> 2)
540			\| ((*buf & 0x18) >> 1)
541			\| (*buf & 0x03);
542
543			++tmphist[idx];
544			++buf;
545			}
546
547			for (j = 0; j < HISTSIZE; ++j)
548			hist[j] = (float)tmphist[j] / (len + 1e-30);
549
550			av_push (result, histsv);
551			}
552
553			RETVAL = newRV_noinc ((SV *)result);
554			}
555			OUTPUT:
556			RETVAL
557	root	1.1
558