CV/CV.xs

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

#include <gdk-pixbuf/gdk-pixbuf.h>

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

#define IW 80

#define RAND (seed = (seed + 7141) * 54773 % 134456)

static guint32 a85_val;
static guint a85_cnt;
static guchar a85_buf[80], *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;
        }
    }
    
}

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::ImageWindow

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_has_alpha (pb) ? 4 : 3;
        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_has_alpha (pb) ? 4 : 3;
        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

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_has_alpha (pb) ? 4 : 3;
        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 + 128) / 255;
                g = ((p[1] + eg + Eg[x]) * 7 + 128) / 255;
                b = ((p[2] + eb + Eb[x]) * 3 + 128) / 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 / 2; er -= er / 2 + RAND % 7 - 3;
                Eg[x] = eg / 2; eg -= eg / 2 + RAND % 7 - 3;
                Eb[x] = eb / 2; eb -= eb / 2 + RAND % 7 - 3;

                *dst++ = r << 5 | g << 2 | b;
              }
          }
}
        OUTPUT:
        RETVAL

MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript

void
dump_pb (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_has_alpha (pb) ? 4 : 3;
        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 < 3; i++)
              a85_push (fp, src [x * bpp + y * sstr + i]);

        a85_finish (fp);
}


Revision:	1.5
Committed:	Sat Nov 8 22:18:50 2003 UTC (20 years, 6 months ago) by root
Branch:	MAIN
Changes since 1.4:	+19 -4 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	1.2	#include <gdk-pixbuf/gdk-pixbuf.h>
6
7			#include <gperl.h>
8			#include <gtk2perl.h>
9
10	root	1.5	#define IW 80
11
12			#define RAND (seed = (seed + 7141) * 54773 % 134456)
13
14	root	1.4	static guint32 a85_val;
15			static guint a85_cnt;
16			static guchar a85_buf[80], *a85_ptr;
17
18			static void
19			a85_init (void)
20			{
21			a85_cnt = 4;
22			a85_ptr = a85_buf;
23			}
24
25			static void
26			a85_push (PerlIO *fp, guchar c)
27			{
28			a85_val = a85_val << 8 \| c;
29
30			if (!--a85_cnt)
31			{
32			a85_cnt = 4;
33			if (a85_val)
34			{
35			a85_ptr[4] = (a85_val % 85) + 33; a85_val /= 85;
36			a85_ptr[3] = (a85_val % 85) + 33; a85_val /= 85;
37			a85_ptr[2] = (a85_val % 85) + 33; a85_val /= 85;
38			a85_ptr[1] = (a85_val % 85) + 33; a85_val /= 85;
39			a85_ptr[0] = (a85_val ) + 33;
40
41			a85_ptr += 5;
42			}
43			else
44			*a85_ptr++ = 'z';
45
46			if (a85_ptr >= a85_buf + sizeof (a85_buf) - 7)
47			{
48			*a85_ptr++ = '\n';
49			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
50			a85_ptr = a85_buf;
51			}
52			}
53
54			}
55
56			a85_finish (PerlIO *fp)
57			{
58			while (a85_cnt != 4)
59			a85_push (fp, 0);
60
61			*a85_ptr++ = '~'; // probably buggy end-marker
62			*a85_ptr++ = '>'; // probably buggy end-marker
63			*a85_ptr++ = '\n';
64
65			PerlIO_write (fp, a85_buf, a85_ptr - a85_buf);
66			}
67
68	root	1.1	MODULE = Gtk2::CV PACKAGE = Gtk2::CV::ImageWindow
69
70			PROTOTYPES: ENABLE
71	root	1.2
72	root	1.3	GdkPixbuf_noinc *
73	root	1.2	transpose (GdkPixbuf *pb)
74			CODE:
75			{
76			int w = gdk_pixbuf_get_width (pb);
77			int h = gdk_pixbuf_get_height (pb);
78			int bpp = gdk_pixbuf_get_has_alpha (pb) ? 4 : 3;
79			int x, y, i;
80			guchar src = gdk_pixbuf_get_pixels (pb), dst;
81			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
82
83			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, h, w);
84
85			dst = gdk_pixbuf_get_pixels (RETVAL);
86			dstr = gdk_pixbuf_get_rowstride (RETVAL);
87
88	root	1.3	for (y = 0; y < h; y++)
89			for (x = 0; x < w; x++)
90	root	1.2	for (i = 0; i < bpp; i++)
91			dst[y * bpp + x * dstr + i] = src[x * bpp + y * sstr + i];
92			}
93			OUTPUT:
94			RETVAL
95
96	root	1.3	GdkPixbuf_noinc *
97	root	1.2	flop (GdkPixbuf *pb)
98			CODE:
99			{
100			int w = gdk_pixbuf_get_width (pb);
101			int h = gdk_pixbuf_get_height (pb);
102			int bpp = gdk_pixbuf_get_has_alpha (pb) ? 4 : 3;
103			int x, y, i;
104			guchar src = gdk_pixbuf_get_pixels (pb), dst;
105			int sstr = gdk_pixbuf_get_rowstride (pb), dstr;
106
107			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, bpp == 4, 8, w, h);
108
109			dst = gdk_pixbuf_get_pixels (RETVAL);
110			dstr = gdk_pixbuf_get_rowstride (RETVAL);
111
112	root	1.3	for (y = 0; y < h; y++)
113			for (x = 0; x < w; x++)
114	root	1.2	for (i = 0; i < bpp; i++)
115	root	1.4	dst[(w - 1 - x) * bpp + y * dstr + i] = src[x * bpp + y * sstr + i];
116	root	1.2	}
117			OUTPUT:
118			RETVAL
119
120			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::Schnauzer
121
122	root	1.3	GdkPixbuf_noinc *
123	root	1.2	p7_to_pb (int w, int h, guchar *src)
124			CODE:
125			{
126			int x, y;
127			guchar dst, d;
128			int dstr;
129
130			RETVAL = gdk_pixbuf_new (GDK_COLORSPACE_RGB, 0, 8, w, h);
131			dst = gdk_pixbuf_get_pixels (RETVAL);
132			dstr = gdk_pixbuf_get_rowstride (RETVAL);
133
134			for (y = 0; y < h; y++)
135			for (d = dst + y * dstr, x = 0; x < w; x++)
136			{
137	root	1.3	d++ = (((src >> 5) & 7) * 255 + 4) / 7;
138			d++ = (((src >> 2) & 7) * 255 + 4) / 7;
139			d++ = (((src >> 0) & 3) * 255 + 2) / 3;
140	root	1.2
141			src++;
142			}
143	root	1.3	}
144			OUTPUT:
145			RETVAL
146
147			SV *
148			pb_to_p7 (GdkPixbuf *pb)
149			CODE:
150			{
151			int w = gdk_pixbuf_get_width (pb);
152			int h = gdk_pixbuf_get_height (pb);
153			int x, y;
154			guchar *dst;
155			int bpp = gdk_pixbuf_get_has_alpha (pb) ? 4 : 3;
156			guchar *src = gdk_pixbuf_get_pixels (pb);
157			int sstr = gdk_pixbuf_get_rowstride (pb);
158	root	1.5	int Er[IW], Eg[IW], Eb[IW];
159			int seed = 77;
160	root	1.3
161			RETVAL = newSV (w * h);
162			SvPOK_only (RETVAL);
163			SvCUR_set (RETVAL, w * h);
164
165			dst = SvPVX (RETVAL);
166
167	root	1.5	memset (Er, 0, sizeof (int) * IW);
168			memset (Eg, 0, sizeof (int) * IW);
169			memset (Eb, 0, sizeof (int) * IW);
170
171			/* some primitive error distribution + random dithering */
172
173	root	1.3	for (y = 0; y < h; y++)
174			{
175			int er = 0, eg = 0, eb = 0;
176
177			for (x = 0; x < w; x++)
178			{
179			int r, g, b;
180			guchar p = src + x bpp + y * sstr;
181
182	root	1.5	r = ((p[0] + er + Er[x]) * 7 + 128) / 255;
183			g = ((p[1] + eg + Eg[x]) * 7 + 128) / 255;
184			b = ((p[2] + eb + Eb[x]) * 3 + 128) / 255;
185	root	1.3
186			r = r > 7 ? 7 : r < 0 ? 0 : r;
187			g = g > 7 ? 7 : g < 0 ? 0 : g;
188			b = b > 3 ? 3 : b < 0 ? 0 : b;
189
190			er += p[0] - (r * 255 + 4) / 7;
191			eg += p[1] - (g * 255 + 4) / 7;
192			eb += p[2] - (b * 255 + 2) / 3;
193	root	1.5
194			Er[x] = er / 2; er -= er / 2 + RAND % 7 - 3;
195			Eg[x] = eg / 2; eg -= eg / 2 + RAND % 7 - 3;
196			Eb[x] = eb / 2; eb -= eb / 2 + RAND % 7 - 3;
197	root	1.3
198			*dst++ = r << 5 \| g << 2 \| b;
199			}
200			}
201	root	1.2	}
202			OUTPUT:
203			RETVAL
204	root	1.4
205			MODULE = Gtk2::CV PACKAGE = Gtk2::CV::PostScript
206
207			void
208			dump_pb (PerlIO fp, GdkPixbuf pb)
209			CODE:
210			{
211			int w = gdk_pixbuf_get_width (pb);
212			int h = gdk_pixbuf_get_height (pb);
213			int x, y, i;
214			guchar *dst;
215			int bpp = gdk_pixbuf_get_has_alpha (pb) ? 4 : 3;
216			guchar *src = gdk_pixbuf_get_pixels (pb);
217			int sstr = gdk_pixbuf_get_rowstride (pb);
218
219			a85_init ();
220
221			for (y = 0; y < h; y++)
222			for (x = 0; x < w; x++)
223			for (i = 0; i < 3; i++)
224			a85_push (fp, src [x * bpp + y * sstr + i]);
225
226			a85_finish (fp);
227			}
228
229	root	1.2
230	root	1.1
231