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  >> 1) >= IW
                   && (cinfo.output_height >> 1) >= IH)
              {
                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)
        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

SV *
make_histogram (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

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

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


Revision:	1.19
Committed:	Wed Jul 20 22:33:01 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.18:	+6 -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			&& (cinfo.output_width >> 1) >= IW
231			&& (cinfo.output_height >> 1) >= IH)
232			{
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			CODE:
319			{
320			int x, y;
321			guchar dst, d;
322			int dstr;
323
324			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
325			dst = gdk_pixbuf_get_pixels (RETVAL);
326			dstr = gdk_pixbuf_get_rowstride (RETVAL);
327
328			for (y = 0; y < h; y++)
329			for (d = dst + y * dstr, x = 0; x < w; x++)
330			{
331	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
332			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
333			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
334	root	1.2
335			src++;
336			}
337	root	1.3	}
338			OUTPUT:
339			RETVAL
340
341			SV *
342			pb_to_p7 (GdkPixbuf *pb)
343			CODE:
344			{
345			int w = gdk_pixbuf_get_width (pb);
346			int h = gdk_pixbuf_get_height (pb);
347			int x, y;
348			guchar *dst;
349	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
350	root	1.3	guchar *src = gdk_pixbuf_get_pixels (pb);
351			int sstr = gdk_pixbuf_get_rowstride (pb);
352	root	1.5	int Er[IW], Eg[IW], Eb[IW];
353			int seed = 77;
354	root	1.3
355			RETVAL = newSV (w * h);
356			SvPOK_only (RETVAL);
357			SvCUR_set (RETVAL, w * h);
358
359			dst = SvPVX (RETVAL);
360
361	root	1.5	memset (Er, 0, sizeof (int) * IW);
362			memset (Eg, 0, sizeof (int) * IW);
363			memset (Eb, 0, sizeof (int) * IW);
364
365			/* some primitive error distribution + random dithering */
366
367	root	1.3	for (y = 0; y < h; y++)
368			{
369			int er = 0, eg = 0, eb = 0;
370
371			for (x = 0; x < w; x++)
372			{
373			int r, g, b;
374			guchar p = src + x bpp + y * sstr;
375
376	root	1.17	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
377			g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
378			b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
379	root	1.3
380			r = r > 7 ? 7 : r < 0 ? 0 : r;
381			g = g > 7 ? 7 : g < 0 ? 0 : g;
382			b = b > 3 ? 3 : b < 0 ? 0 : b;
383
384			er += p[0] - (r * 255 + 4) / 7;
385			eg += p[1] - (g * 255 + 4) / 7;
386			eb += p[2] - (b * 255 + 2) / 3;
387	root	1.5
388	root	1.17	Er[x] = er >> 1; er -= (er + 1) >> 1;
389			Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
390			Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
391	root	1.3
392			*dst++ = r << 5 \| g << 2 \| b;
393			}
394			}
395	root	1.2	}
396			OUTPUT:
397			RETVAL
398	root	1.6
399	root	1.10	SV *
400			make_histogram (SV *ar)
401			CODE:
402			{
403			int i;
404			AV av, result;
405
406			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
407			croak ("Not an array ref as first argument to make_histogram");
408
409			av = (AV *) SvRV (ar);
410			result = newAV ();
411
412			for (i = 0; i <= av_len (av); ++i)
413			{
414	root	1.15	const int HISTSIZE = 64;
415
416			int j;
417	root	1.10	SV sv = av_fetch (av, i, 1);
418			STRLEN len;
419			char *buf = SvPVbyte (sv, len);
420	root	1.11
421	root	1.15	int tmphist[HISTSIZE];
422			float *hist;
423	root	1.10
424	root	1.15	SV histsv = newSV (HISTSIZE sizeof (float) + 1);
425	root	1.13	SvPOK_on (histsv);
426	root	1.15	SvCUR_set (histsv, HISTSIZE * sizeof (float));
427			hist = (float *)SvPVX (histsv);
428	root	1.10
429	root	1.15	Zero (tmphist, sizeof (tmphist), char);
430	root	1.10
431	root	1.15	for (j = len; j--; )
432			{
433			unsigned int idx
434			= ((*buf & 0xc0) >> 2)
435			\| ((*buf & 0x18) >> 1)
436			\| (*buf & 0x03);
437	root	1.14
438	root	1.15	++tmphist[idx];
439			++buf;
440			}
441	root	1.10
442	root	1.15	for (j = 0; j < HISTSIZE; ++j)
443			hist[j] = (float)tmphist[j] / (len + 1e-30);
444	root	1.10
445			av_push (result, histsv);
446			}
447
448			RETVAL = newRV_noinc ((SV *)result);
449			}
450			OUTPUT:
451			RETVAL
452
453	root	1.6	#############################################################################
454	root	1.4
455			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
456
457			void
458	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
459	root	1.4	CODE:
460			{
461			int w = gdk_pixbuf_get_width (pb);
462			int h = gdk_pixbuf_get_height (pb);
463			int x, y, i;
464			guchar *dst;
465	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
466	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
467			int sstr = gdk_pixbuf_get_rowstride (pb);
468
469			a85_init ();
470
471			for (y = 0; y < h; y++)
472			for (x = 0; x < w; x++)
473	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
474	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
475
476			a85_finish (fp);
477	root	1.7	}
478
479			void
480			dump_binary (PerlIO fp, GdkPixbuf pb)
481			CODE:
482			{
483			int w = gdk_pixbuf_get_width (pb);
484			int h = gdk_pixbuf_get_height (pb);
485			int x, y, i;
486			guchar *dst;
487			int bpp = gdk_pixbuf_get_n_channels (pb);
488			guchar *src = gdk_pixbuf_get_pixels (pb);
489			int sstr = gdk_pixbuf_get_rowstride (pb);
490
491			for (y = 0; y < h; y++)
492			for (x = 0; x < w; x++)
493			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
494			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
495	root	1.4	}
496	root	1.8
497			#############################################################################
498
499			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
500
501			SV *
502			pb_to_hv84 (GdkPixbuf *pb)
503			CODE:
504			{
505			int w = gdk_pixbuf_get_width (pb);
506			int h = gdk_pixbuf_get_height (pb);
507			int x, y;
508			guchar *dst;
509			int bpp = gdk_pixbuf_get_n_channels (pb);
510			guchar *src = gdk_pixbuf_get_pixels (pb);
511			int sstr = gdk_pixbuf_get_rowstride (pb);
512
513			RETVAL = newSV (6 * 8 * 12 / 8);
514			SvPOK_only (RETVAL);
515			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
516
517			dst = SvPVX (RETVAL);
518
519			/* some primitive error distribution + random dithering */
520
521			for (y = 0; y < h; y++)
522			{
523			guchar p = src + y sstr;
524
525			for (x = 0; x < w; x += 2)
526			{
527			unsigned int r, g, b, h, s, v, H, V1, V2;
528
529			if (bpp == 3)
530			r = p++, g = p++, b = *p++;
531			else if (bpp == 1)
532			r = g = b = *p++;
533			else
534			abort ();
535
536			rgb_to_hsv (r, g, b, &h, &s, &v);
537
538			H = (h * 15 / 255) << 4;
539			V1 = v;
540
541			if (bpp == 3)
542			r = p++, g = p++, b = *p++;
543			else if (bpp == 1)
544			r = g = b = *p++;
545			else
546			abort ();
547
548			rgb_to_hsv (r, g, b, &h, &s, &v);
549
550			H \|= h * 15 / 255;
551			V2 = v;
552
553			*dst++ = H;
554			*dst++ = V1;
555			*dst++ = V2;
556			}
557			}
558			}
559			OUTPUT:
560			RETVAL
561	root	1.4
562	root	1.9	SV *
563			hv84_to_av (unsigned char *hv84)
564			CODE:
565			{
566			int i = 72 / 3;
567			AV *av = newAV ();
568
569			RETVAL = (SV )newRV_noinc ((SV )av);
570			while (i--)
571			{
572			int h = *hv84++;
573			int v1 = *hv84++;
574			int v2 = *hv84++;
575
576			av_push (av, newSViv (v1));
577			av_push (av, newSViv ((h >> 4) * 255 / 15));
578			av_push (av, newSViv (v2));
579			av_push (av, newSViv ((h & 15) * 255 / 15));
580			}
581			}
582			OUTPUT:
583			RETVAL
584	root	1.2
585	root	1.1
586