1/*
2
3Copyright 1988, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25*/
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include <X11/Xlib.h>
31#include <X11/Xmu/Drawing.h>
32
33/*
34 *  Draw the "official" X Window System Logo, designed by Danny Chong
35 *
36 *  Written by Ollie Jones, Apollo Computer
37 *
38 *  Does some fancy stuff to make the logo look acceptable even
39 *  if it is tiny.  Also makes the various linear elements of
40 *  the logo line up as well as possible considering rasterization.
41 */
42void
43XmuDrawLogo(Display *dpy, Drawable drawable, GC gcFore, GC gcBack,
44	    int x, int y, unsigned int width, unsigned int height)
45{
46    unsigned int size;
47    int thin, gap, d31;
48    XPoint poly[4];
49
50    XFillRectangle(dpy, drawable, gcBack, x, y, width, height);
51
52    /* for now, do a centered even-sized square, at least for now */
53    size = width;
54    if (height < width)
55	 size = height;
56    size &= ~1;
57    x += (width - size) >> 1;
58    y += (height - size) >> 1;
59
60/*
61 * Draw what will be the thin strokes.
62 *
63 *           -----
64 *          /    /
65 *         /    /
66 *        /    /
67 *       /    /
68 *      /____/
69 *           d
70 *
71 * Point d is 9/44 (~1/5) of the way across.
72 */
73
74    thin = (size / 11);
75    if (thin < 1) thin = 1;
76    gap = (thin+3) / 4;
77    d31 = thin + thin + gap;
78    poly[0].x = x + size;              poly[0].y = y;
79    poly[1].x = x + size-d31;          poly[1].y = y;
80    poly[2].x = x + 0;                 poly[2].y = y + size;
81    poly[3].x = x + d31;               poly[3].y = y + size;
82    XFillPolygon(dpy, drawable, gcFore, poly, 4, Convex, CoordModeOrigin);
83
84/*
85 * Erase area not needed for lower thin stroke.
86 *
87 *           ------
88 *          /     /
89 *         /  __ /
90 *        /  /  /
91 *       /  /  /
92 *      /__/__/
93 */
94
95    poly[0].x = x + d31/2;                       poly[0].y = y + size;
96    poly[1].x = x + size / 2;                    poly[1].y = y + size/2;
97    poly[2].x = x + (size/2)+(d31-(d31/2));      poly[2].y = y + size/2;
98    poly[3].x = x + d31;                         poly[3].y = y + size;
99    XFillPolygon(dpy, drawable, gcBack, poly, 4, Convex, CoordModeOrigin);
100
101/*
102 * Erase area not needed for upper thin stroke.
103 *
104 *           ------
105 *          /  /  /
106 *         /--/  /
107 *        /     /
108 *       /     /
109 *      /_____/
110 */
111
112    poly[0].x = x + size - d31/2;                poly[0].y = y;
113    poly[1].x = x + size / 2;                    poly[1].y = y + size/2;
114    poly[2].x = x + (size/2)-(d31-(d31/2));      poly[2].y = y + size/2;
115    poly[3].x = x + size - d31;                  poly[3].y = y;
116    XFillPolygon(dpy, drawable, gcBack, poly, 4, Convex, CoordModeOrigin);
117
118/*
119 * Draw thick stroke.
120 * Point b is 1/4 of the way across.
121 *
122 *      b
123 * -----
124 * \    \
125 *  \    \
126 *   \    \
127 *    \    \
128 *     \____\
129 */
130
131    poly[0].x = x;                     poly[0].y = y;
132    poly[1].x = x + size/4;            poly[1].y = y;
133    poly[2].x = x + size;              poly[2].y = y + size;
134    poly[3].x = x + size - size/4;     poly[3].y = y + size;
135    XFillPolygon(dpy, drawable, gcFore, poly, 4, Convex, CoordModeOrigin);
136
137/*
138 * Erase to create gap.
139 *
140 *          /
141 *         /
142 *        /
143 *       /
144 *      /
145 */
146
147    poly[0].x = x + size- thin;        poly[0].y = y;
148    poly[1].x = x + size-( thin+gap);  poly[1].y = y;
149    poly[2].x = x + thin;              poly[2].y = y + size;
150    poly[3].x = x + thin + gap;        poly[3].y = y + size;
151    XFillPolygon(dpy, drawable, gcBack, poly, 4, Convex, CoordModeOrigin);
152}
153