summaryrefslogtreecommitdiff
path: root/examples/xftview.c
blob: 0bfcec04e7608896946e8666633d5b412d8d3840 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
/* Pango
 * pangoft2topgm.c: Example program to view a UTF-8 encoding file
 *                  using Pango to render result.
 *
 * Copyright (C) 1999,2004 Red Hat, Inc.
 * Copyright (C) 2001 Sun Microsystems
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "renderdemo.h"

#include <pango/pangoxft.h>

static Region update_region = NULL;
static XftDraw *draw;
static PangoContext *context;

static void
xft_render (PangoLayout *layout,
	    int          x,
	    int          y,
	    gpointer     data)
{
  XftColor color;

  color.color.red = 0x0;
  color.color.green = 0x0;
  color.color.blue = 0x0;
  color.color.alpha = 0xffff;

  pango_xft_render_layout (draw, &color, layout, x, y);
}

void
update ()
{
  XRectangle area;
  XftColor color;

  XClipBox (update_region, &area);
  XftDrawSetClip (draw, update_region);
  XDestroyRegion (update_region);
  update_region = NULL;

  color.color.red = 0xffff;
  color.color.blue = 0xffff;
  color.color.green = 0xffff;
  color.color.alpha = 0xffff;

  XftDrawRect (draw, &color,
	       area.x, area.y, area.width, area.height);

  do_output (context, xft_render, NULL, draw, NULL, NULL);
}

void
expose (XExposeEvent *xev)
{
  XRectangle area;
  
  if (!update_region)
    update_region = XCreateRegion ();

  area.x = xev->x;
  area.y = xev->y;
  area.width = xev->width;
  area.height = xev->height;

  XUnionRectWithRegion (&area, update_region, update_region);
}

int main (int argc, char **argv)
{
  Display *display;
  int screen;
  Window window;
  XEvent xev;
  unsigned long bg;
  int width, height;
  XSizeHints size_hints;
  
  g_type_init();

  XftInit (NULL);
  
  parse_options (argc, argv);

  display = XOpenDisplay (NULL);
  if (!display)
    fail ("Cannot open display %s\n", XDisplayName (NULL));

  screen = DefaultScreen (display);
  bg = WhitePixel (display, screen);

  context = pango_xft_get_context (display, screen);
  do_output (context, NULL, NULL, NULL, &width, &height);

  window = XCreateSimpleWindow (display, DefaultRootWindow (display),
				0, 0, width, height, 0,
				bg, bg);
  XSelectInput (display, window, ExposureMask);
  
  XMapWindow (display, window);
  draw = XftDrawCreate (display, window,
			DefaultVisual (display, screen),
			DefaultColormap (display, screen));
  XmbSetWMProperties (display, window,
		      get_options_string (),
		      NULL, NULL, 0, NULL, NULL, NULL);

  memset ((char *)&size_hints, 0, sizeof (XSizeHints));
  size_hints.flags = PSize | PMaxSize;
  size_hints.width = width; size_hints.height = height; /* for compat only */
  size_hints.max_width = width; size_hints.max_height = height;
  
  XSetWMNormalHints (display, window, &size_hints);

  while (1)
    {
      if (!XPending (display) && update_region)
	update ();
	
      XNextEvent (display, &xev);
      if (xev.xany.type == Expose)
	{
	  expose (&xev.xexpose);
	}
    }
  
  return 0;
}