CV/CV.xs

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

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:	1.17
Committed:	Wed Jul 20 06:20:36 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.16:	+149 -36 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	1.17	#include <setjmp.h>
6
7			#include <jpeglib.h>
8	root	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
9
10			#include <gperl.h>
11			#include <gtk2perl.h>
12
13	root	1.17	#define IW 80 /* MUST match Schnauer.pm! */
14			#define IH 60 /* MUST match Schnauer.pm! */
15	root	1.5
16			#define RAND (seed = (seed + 7141) * 54773 % 134456)
17
18	root	1.7	#define LINELENGTH 240
19
20	root	1.6	#define ELLIPSIS "\xe2\x80\xa6"
21
22	root	1.17	struct jpg_err_mgr
23			{
24			struct jpeg_error_mgr err;
25			jmp_buf setjmp_buffer;
26			};
27
28			static void
29			cv_error_exit (j_common_ptr cinfo)
30			{
31			longjmp (((struct jpg_err_mgr *)cinfo->err)->setjmp_buffer, 99);
32			}
33
34			static void
35			cv_error_output (j_common_ptr cinfo)
36			{
37			return;
38			}
39
40			static void
41			rgb_to_hsv (unsigned int r, unsigned int g, unsigned int b,
42			unsigned int h, unsigned int s, unsigned int *v)
43			{
44			unsigned int mx = r; if (g > mx) mx = g; if (b > mx) mx = b;
45			unsigned int mn = r; if (g < mn) mn = g; if (b < mn) mn = b;
46			unsigned int delta = mx - mn;
47
48			*v = mx;
49
50			s = mx ? delta 255 / mx : 0;
51
52			if (delta == 0)
53			*h = 0;
54			else
55			{
56			if (r == mx)
57			h = ((int)g - (int)b) 255 / (int)(delta * 3);
58			else if (g == mx)
59			h = ((int)b - (int)r) 255 / (int)(delta * 3) + 52;
60			else if (b == mx)
61			h = ((int)r - (int)g) 255 / (int)(delta * 3) + 103;
62
63			*h &= 255;
64			}
65			}
66
67	root	1.4	static guint32 a85_val;
68			static guint a85_cnt;
69	root	1.7	static guchar a85_buf[LINELENGTH], *a85_ptr;
70	root	1.4
71			static void
72			a85_init (void)
73			{
74			a85_cnt = 4;
75			a85_ptr = a85_buf;
76			}
77
78			static void
79			a85_push (PerlIO *fp, guchar c)
80			{
81			a85_val = a85_val << 8 \| c;
82
83			if (!--a85_cnt)
84			{
85			a85_cnt = 4;
86			if (a85_val)
87			{
88			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
89			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
90			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
91			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
92			a85_ptr[0] = (a85_val ) + 33;
93
94			a85_ptr += 5;
95			}
96			else
97			*a85_ptr++ = 'z';
98
99			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
100			{
101			*a85_ptr++ = '\n';
102			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
103			a85_ptr = a85_buf;
104			}
105			}
106
107			}
108
109	root	1.8	static void
110	root	1.4	a85_finish (PerlIO *fp)
111			{
112			while (a85_cnt != 4)
113			a85_push (fp, 0);
114
115			*a85_ptr++ = '~'; // probably buggy end-marker
116			*a85_ptr++ = '>'; // probably buggy end-marker
117			*a85_ptr++ = '\n';
118
119			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
120			}
121
122	root	1.6	/////////////////////////////////////////////////////////////////////////////
123
124	root	1.9	MODULE = Gtk2::CV PACKAGE = Gtk2::CV
125	root	1.1
126			PROTOTYPES: ENABLE
127	root	1.2
128	root	1.3	GdkPixbuf_noinc *
129	root	1.2	transpose (GdkPixbuf *pb)
130			CODE:
131			{
132			int w = gdk_pixbuf_get_width (pb);
133			int h = gdk_pixbuf_get_height (pb);
134	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
135	root	1.2	int x, y, i;
136			guchar src = gdk_pixbuf_get_pixels (pb), dst;
137			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
138
139			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, h, w);
140
141			dst = gdk_pixbuf_get_pixels (RETVAL);
142			dstr = gdk_pixbuf_get_rowstride (RETVAL);
143
144	root	1.3	for (y = 0; y < h; y++)
145			for (x = 0; x < w; x++)
146	root	1.2	for (i = 0; i < bpp; i++)
147			dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i];
148			}
149			OUTPUT:
150			RETVAL
151
152	root	1.3	GdkPixbuf_noinc *
153	root	1.2	flop (GdkPixbuf *pb)
154			CODE:
155			{
156			int w = gdk_pixbuf_get_width (pb);
157			int h = gdk_pixbuf_get_height (pb);
158	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
159	root	1.2	int x, y, i;
160			guchar src = gdk_pixbuf_get_pixels (pb), dst;
161			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
162
163			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, w, h);
164
165			dst = gdk_pixbuf_get_pixels (RETVAL);
166			dstr = gdk_pixbuf_get_rowstride (RETVAL);
167
168	root	1.3	for (y = 0; y < h; y++)
169			for (x = 0; x < w; x++)
170	root	1.2	for (i = 0; i < bpp; i++)
171	root	1.4	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
172	root	1.2	}
173			OUTPUT:
174			RETVAL
175
176	root	1.17	GdkPixbuf_noinc *
177			load_jpeg (char *path, int thumbnail=0)
178			CODE:
179			{
180			struct jpeg_decompress_struct cinfo;
181			struct jpg_err_mgr jerr;
182			guchar *data;
183			int rs;
184			FILE *fp;
185			volatile GdkPixbuf *pb = 0;
186			RETVAL = 0;
187
188			if (!(fp = fopen (path, "rb")))
189			XSRETURN_UNDEF;
190
191			cinfo.err = jpeg_std_error (&jerr.err);
192
193			jerr.err.error_exit = cv_error_exit;
194			jerr.err.output_message = cv_error_output;
195
196			if ((rs = setjmp (jerr.setjmp_buffer)))
197			{
198			fclose (fp);
199			jpeg_destroy_decompress (&cinfo);
200
201			if (pb)
202			g_object_unref ((gpointer)pb);
203
204			XSRETURN_UNDEF;
205			}
206
207			jpeg_create_decompress (&cinfo);
208
209			jpeg_stdio_src (&cinfo, fp);
210			jpeg_read_header (&cinfo, TRUE);
211
212			cinfo.dct_method = JDCT_DEFAULT;
213			cinfo.do_fancy_upsampling = FALSE; /* worse quality, but nobody compained so far, and gdk-pixbuf does the same */
214			cinfo.do_block_smoothing = FALSE;
215			cinfo.out_color_space = JCS_RGB;
216			cinfo.quantize_colors = FALSE;
217
218			cinfo.scale_num = 1;
219			cinfo.scale_denom = 1;
220
221			jpeg_calc_output_dimensions (&cinfo);
222
223			if (thumbnail)
224			{
225			cinfo.dct_method = JDCT_FASTEST;
226			cinfo.do_fancy_upsampling = FALSE;
227
228			while (cinfo.scale_denom < 8
229			&& (cinfo.output_width >> 1) >= IW
230			&& (cinfo.output_height >> 1) >= IH)
231			{
232			cinfo.scale_denom <<= 1;
233			jpeg_calc_output_dimensions (&cinfo);
234			}
235			}
236
237			pb = RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, cinfo.output_width, cinfo.output_height);
238			if (!RETVAL)
239			longjmp (jerr.setjmp_buffer, 2);
240
241			data = gdk_pixbuf_get_pixels (RETVAL);
242			rs = gdk_pixbuf_get_rowstride (RETVAL);
243
244			if (cinfo.output_components != 3)
245			longjmp (jerr.setjmp_buffer, 3);
246
247			jpeg_start_decompress (&cinfo);
248
249			while (cinfo.output_scanline < cinfo.output_height)
250			{
251			int remaining = cinfo.output_height - cinfo.output_scanline;
252			JSAMPROW rp[4];
253
254			rp [0] = data + cinfo.output_scanline * rs;
255			rp [1] = (guchar *)rp [0] + rs;
256			rp [2] = (guchar *)rp [1] + rs;
257			rp [3] = (guchar *)rp [2] + rs;
258
259			jpeg_read_scanlines (&cinfo, rp, remaining < 4 ? remaining : 4);
260			}
261
262			jpeg_finish_decompress (&cinfo);
263			fclose (fp);
264			jpeg_destroy_decompress (&cinfo);
265			}
266			OUTPUT:
267			RETVAL
268
269	root	1.6	#############################################################################
270
271	root	1.2	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
272
273	root	1.3	GdkPixbuf_noinc *
274	root	1.2	p7_to_pb (int w, int h, guchar *src)
275			CODE:
276			{
277			int x, y;
278			guchar dst, d;
279			int dstr;
280
281			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
282			dst = gdk_pixbuf_get_pixels (RETVAL);
283			dstr = gdk_pixbuf_get_rowstride (RETVAL);
284
285			for (y = 0; y < h; y++)
286			for (d = dst + y * dstr, x = 0; x < w; x++)
287			{
288	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
289			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
290			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
291	root	1.2
292			src++;
293			}
294	root	1.3	}
295			OUTPUT:
296			RETVAL
297
298			SV *
299			pb_to_p7 (GdkPixbuf *pb)
300			CODE:
301			{
302			int w = gdk_pixbuf_get_width (pb);
303			int h = gdk_pixbuf_get_height (pb);
304			int x, y;
305			guchar *dst;
306	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
307	root	1.3	guchar *src = gdk_pixbuf_get_pixels (pb);
308			int sstr = gdk_pixbuf_get_rowstride (pb);
309	root	1.5	int Er[IW], Eg[IW], Eb[IW];
310			int seed = 77;
311	root	1.3
312			RETVAL = newSV (w * h);
313			SvPOK_only (RETVAL);
314			SvCUR_set (RETVAL, w * h);
315
316			dst = SvPVX (RETVAL);
317
318	root	1.5	memset (Er, 0, sizeof (int) * IW);
319			memset (Eg, 0, sizeof (int) * IW);
320			memset (Eb, 0, sizeof (int) * IW);
321
322			/* some primitive error distribution + random dithering */
323
324	root	1.3	for (y = 0; y < h; y++)
325			{
326			int er = 0, eg = 0, eb = 0;
327
328			for (x = 0; x < w; x++)
329			{
330			int r, g, b;
331			guchar p = src + x bpp + y * sstr;
332
333	root	1.17	r = ((p[0] + er + Er[x]) * 7 + (RAND & 127) + 64) / 255;
334			g = ((p[1] + eg + Eg[x]) * 7 + (RAND & 127) + 64) / 255;
335			b = ((p[2] + eb + Eb[x]) * 3 + (RAND & 127) + 64) / 255;
336	root	1.3
337			r = r > 7 ? 7 : r < 0 ? 0 : r;
338			g = g > 7 ? 7 : g < 0 ? 0 : g;
339			b = b > 3 ? 3 : b < 0 ? 0 : b;
340
341			er += p[0] - (r * 255 + 4) / 7;
342			eg += p[1] - (g * 255 + 4) / 7;
343			eb += p[2] - (b * 255 + 2) / 3;
344	root	1.5
345	root	1.17	Er[x] = er >> 1; er -= (er + 1) >> 1;
346			Eg[x] = eg >> 1; eg -= (eg + 1) >> 1;
347			Eb[x] = eb >> 1; eb -= (eb + 1) >> 1;
348	root	1.3
349			*dst++ = r << 5 \| g << 2 \| b;
350			}
351			}
352	root	1.2	}
353			OUTPUT:
354			RETVAL
355	root	1.6
356	root	1.10	SV *
357			make_histogram (SV *ar)
358			CODE:
359			{
360			int i;
361			AV av, result;
362
363			if (!SvROK (ar) \|\| SvTYPE (SvRV (ar)) != SVt_PVAV)
364			croak ("Not an array ref as first argument to make_histogram");
365
366			av = (AV *) SvRV (ar);
367			result = newAV ();
368
369			for (i = 0; i <= av_len (av); ++i)
370			{
371	root	1.15	const int HISTSIZE = 64;
372
373			int j;
374	root	1.10	SV sv = av_fetch (av, i, 1);
375			STRLEN len;
376			char *buf = SvPVbyte (sv, len);
377	root	1.11
378	root	1.15	int tmphist[HISTSIZE];
379			float *hist;
380	root	1.10
381	root	1.15	SV histsv = newSV (HISTSIZE sizeof (float) + 1);
382	root	1.13	SvPOK_on (histsv);
383	root	1.15	SvCUR_set (histsv, HISTSIZE * sizeof (float));
384			hist = (float *)SvPVX (histsv);
385	root	1.10
386	root	1.15	Zero (tmphist, sizeof (tmphist), char);
387	root	1.10
388	root	1.15	for (j = len; j--; )
389			{
390			unsigned int idx
391			= ((*buf & 0xc0) >> 2)
392			\| ((*buf & 0x18) >> 1)
393			\| (*buf & 0x03);
394	root	1.14
395	root	1.15	++tmphist[idx];
396			++buf;
397			}
398	root	1.10
399	root	1.15	for (j = 0; j < HISTSIZE; ++j)
400			hist[j] = (float)tmphist[j] / (len + 1e-30);
401	root	1.10
402			av_push (result, histsv);
403			}
404
405			RETVAL = newRV_noinc ((SV *)result);
406			}
407			OUTPUT:
408			RETVAL
409
410	root	1.6	#############################################################################
411	root	1.4
412			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
413
414			void
415	root	1.7	dump_ascii85 (PerlIO fp, GdkPixbuf pb)
416	root	1.4	CODE:
417			{
418			int w = gdk_pixbuf_get_width (pb);
419			int h = gdk_pixbuf_get_height (pb);
420			int x, y, i;
421			guchar *dst;
422	root	1.7	int bpp = gdk_pixbuf_get_n_channels (pb);
423	root	1.4	guchar *src = gdk_pixbuf_get_pixels (pb);
424			int sstr = gdk_pixbuf_get_rowstride (pb);
425
426			a85_init ();
427
428			for (y = 0; y < h; y++)
429			for (x = 0; x < w; x++)
430	root	1.7	for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
431	root	1.4	a85_push (fp, src [x * bpp + y * sstr + i]);
432
433			a85_finish (fp);
434	root	1.7	}
435
436			void
437			dump_binary (PerlIO fp, GdkPixbuf pb)
438			CODE:
439			{
440			int w = gdk_pixbuf_get_width (pb);
441			int h = gdk_pixbuf_get_height (pb);
442			int x, y, i;
443			guchar *dst;
444			int bpp = gdk_pixbuf_get_n_channels (pb);
445			guchar *src = gdk_pixbuf_get_pixels (pb);
446			int sstr = gdk_pixbuf_get_rowstride (pb);
447
448			for (y = 0; y < h; y++)
449			for (x = 0; x < w; x++)
450			for (i = 0; i < (bpp < 3 ? 1 : 3); i++)
451			PerlIO_putc (fp, src [x * bpp + y * sstr + i]);
452	root	1.4	}
453	root	1.8
454			#############################################################################
455
456			MODULE = Gtk2::CV PACKAGE = Gtk2::CV
457
458			SV *
459			pb_to_hv84 (GdkPixbuf *pb)
460			CODE:
461			{
462			int w = gdk_pixbuf_get_width (pb);
463			int h = gdk_pixbuf_get_height (pb);
464			int x, y;
465			guchar *dst;
466			int bpp = gdk_pixbuf_get_n_channels (pb);
467			guchar *src = gdk_pixbuf_get_pixels (pb);
468			int sstr = gdk_pixbuf_get_rowstride (pb);
469
470			RETVAL = newSV (6 * 8 * 12 / 8);
471			SvPOK_only (RETVAL);
472			SvCUR_set (RETVAL, 6 * 8 * 12 / 8);
473
474			dst = SvPVX (RETVAL);
475
476			/* some primitive error distribution + random dithering */
477
478			for (y = 0; y < h; y++)
479			{
480			guchar p = src + y sstr;
481
482			for (x = 0; x < w; x += 2)
483			{
484			unsigned int r, g, b, h, s, v, H, V1, V2;
485
486			if (bpp == 3)
487			r = p++, g = p++, b = *p++;
488			else if (bpp == 1)
489			r = g = b = *p++;
490			else
491			abort ();
492
493			rgb_to_hsv (r, g, b, &h, &s, &v);
494
495			H = (h * 15 / 255) << 4;
496			V1 = v;
497
498			if (bpp == 3)
499			r = p++, g = p++, b = *p++;
500			else if (bpp == 1)
501			r = g = b = *p++;
502			else
503			abort ();
504
505			rgb_to_hsv (r, g, b, &h, &s, &v);
506
507			H \|= h * 15 / 255;
508			V2 = v;
509
510			*dst++ = H;
511			*dst++ = V1;
512			*dst++ = V2;
513			}
514			}
515			}
516			OUTPUT:
517			RETVAL
518	root	1.4
519	root	1.9	SV *
520			hv84_to_av (unsigned char *hv84)
521			CODE:
522			{
523			int i = 72 / 3;
524			AV *av = newAV ();
525
526			RETVAL = (SV )newRV_noinc ((SV )av);
527			while (i--)
528			{
529			int h = *hv84++;
530			int v1 = *hv84++;
531			int v2 = *hv84++;
532
533			av_push (av, newSViv (v1));
534			av_push (av, newSViv ((h >> 4) * 255 / 15));
535			av_push (av, newSViv (v2));
536			av_push (av, newSViv ((h & 15) * 255 / 15));
537			}
538			}
539			OUTPUT:
540			RETVAL
541	root	1.2
542	root	1.1
543