1 /*
2
3 Copyright 1989, 1998 The Open Group
4
5 Permission to use, copy, modify, distribute, and sell this software and its
6 documentation for any purpose is hereby granted without fee, provided that
7 the above copyright notice appear in all copies and that both that
8 copyright notice and this permission notice appear in supporting
9 documentation.
10
11 The above copyright notice and this permission notice shall be included in
12 all copies or substantial portions of the Software.
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21 Except as contained in this notice, the name of The Open Group shall not be
22 used in advertising or otherwise to promote the sale, use or other dealings
23 in 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 <stdio.h>
31 #include <X11/Xlib.h>
32 #include <X11/Xatom.h>
33 #include <X11/Xutil.h>
34 #include <X11/Xmu/StdCmap.h>
35
36 static XVisualInfo *getDeepestVisual(int, XVisualInfo*, int);
37
38 /*
39 * To create all of the appropriate standard colormaps for every visual of
40 * every screen on a given display, use XmuAllStandardColormaps.
41 *
42 * Define and retain as permanent resources all standard colormaps which are
43 * meaningful for the visuals of each screen of the display. Return 0 on
44 * failure, non-zero on success. If the property of any standard colormap
45 * is already defined, redefine it.
46 *
47 * This interface is intended to be used by window managers or a client
48 * upon start-up of a session.
49 *
50 * The standard colormaps of a screen are defined by properties associated
51 * with the screen's root window. Each screen has exactly one root window.
52 * The property names of standard colormaps are predefined, and each property
53 * name may describe at most one colormap.
54 *
55 * The standard colormaps are
56 * RGB_BEST_MAP
57 * RGB_RED_MAP
58 * RGB_GREEN_MAP
59 * RGB_BLUE_MAP
60 * RGB_DEFAULT_MAP
61 * RGB_GRAY_MAP
62 *
63 * Therefore a screen may have at most 6 standard colormap properties defined.
64 *
65 * A standard colormap is associated with a particular visual of the screen.
66 * A screen may have multiple visuals defined, including visuals of the same
67 * class at different depths. Note that a visual id might be repeated for
68 * more than one depth, so the visual id and the depth of a visual identify
69 * the visual. The characteristics of the visual will determine which
70 * standard colormaps are meaningful under that visual, and will determine
71 * how the standard colormap is defined. Because a standard colormap is
72 * associated with a specific visual, there must be a method of determining
73 * which visuals take precedence in defining standard colormaps.
74 *
75 * The method used here is: for the visual of greatest depth, define all
76 * standard colormaps meaningful to that visual class, according to this
77 * order of (descending) precedence:
78 * 1. DirectColor
79 * 2. PseudoColor
80 * 3. TrueColor and GrayScale
81 * 4. StaticColor and StaticGray
82 *
83 * Allows partial success by screenful. For example, if a map on screen 1
84 * fails, the maps on screen 0, created earlier, will remain. However,
85 * none on screen 1 will remain. If a map on 0 fails, none will remain.
86 *
87 * See the comments under XmuVisualStandardColormaps() for notes on which
88 * standard colormaps are meaningful under these classes of visuals.
89 */
90
91 Status
XmuAllStandardColormaps(Display * dpy)92 XmuAllStandardColormaps(Display *dpy)
93 {
94 int nvisuals, scr;
95 Status status;
96 long vinfo_mask;
97 XVisualInfo template, *vinfo, *v1, *v2;
98
99 status = 0;
100 /* for each screen, determine all visuals of this server */
101 for (scr=0; scr < ScreenCount(dpy); scr++)
102 {
103 template.screen = scr;
104 vinfo_mask = VisualScreenMask;
105 vinfo = XGetVisualInfo(dpy, vinfo_mask, &template, &nvisuals);
106 if (vinfo == NULL) /* unexpected: a screen with no visuals */
107 continue;
108
109 v1 = getDeepestVisual(DirectColor, vinfo, nvisuals);
110 v2 = getDeepestVisual(PseudoColor, vinfo, nvisuals);
111
112 if (v2 &&
113 (!v1 || (v2->colormap_size >=
114 ((v1->red_mask | v1->green_mask | v1->blue_mask) + 1))))
115 status = XmuVisualStandardColormaps(dpy, scr, v2->visualid,
116 (unsigned) v2->depth, 1, 1);
117 else if (v1)
118 status = XmuVisualStandardColormaps(dpy, scr, v1->visualid,
119 (unsigned) v1->depth, 1, 1);
120
121 else {
122 if (((v1 = getDeepestVisual(TrueColor, vinfo, nvisuals)) != NULL)
123 || ((v1 = getDeepestVisual(StaticColor, vinfo, nvisuals)) !=
124 NULL))
125 status = XmuVisualStandardColormaps(dpy, scr, v1->visualid,
126 (unsigned) v1->depth, 1, 1);
127 if (status &&
128 (((v1 = getDeepestVisual(GrayScale, vinfo, nvisuals)) != NULL)
129 || ((v1 = getDeepestVisual(StaticGray, vinfo, nvisuals)) !=
130 NULL)))
131 status = XmuVisualStandardColormaps(dpy, scr, v1->visualid,
132 (unsigned) v1->depth, 1, 1);
133 }
134 XFree ((char *) vinfo);
135 if (!status) break;
136 }
137 return status;
138 }
139
140 static XVisualInfo *
getDeepestVisual(int visual_class,XVisualInfo * vinfo,int nvisuals)141 getDeepestVisual(int visual_class, XVisualInfo *vinfo, int nvisuals)
142 {
143 register int i;
144 register int maxdepth = 0;
145 XVisualInfo *v = NULL;
146
147 for (i=0; i < nvisuals; i++, vinfo++)
148 if (vinfo->class == visual_class && vinfo->depth > maxdepth)
149 {
150 maxdepth = vinfo->depth;
151 v = vinfo;
152 }
153 return(v);
154 }
155
156