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dd6d43a6 MW |
1 | /* -*-c-*- |
2 | * | |
3 | * Redraw the screen in case it's been trashed somehow | |
4 | * | |
5 | * (c) 2016 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of the Edgeware X tools collection. | |
11 | * | |
12 | * X tools is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * X tools is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU General Public License | |
23 | * along with X tools; if not, write to the Free Software Foundation, | |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
25 | */ | |
26 | ||
27 | /*----- Header files ------------------------------------------------------*/ | |
28 | ||
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
32 | ||
33 | #include <sys/time.h> | |
34 | #include <sys/types.h> | |
35 | #include <unistd.h> | |
36 | ||
37 | #include <X11/Xlib.h> | |
38 | ||
69353127 | 39 | #include <mLib/alloc.h> |
dd6d43a6 MW |
40 | #include <mLib/mdwopt.h> |
41 | #include <mLib/quis.h> | |
42 | #include <mLib/report.h> | |
43 | ||
44 | /*----- Global variables --------------------------------------------------*/ | |
45 | ||
46 | static Display *dpy; | |
47 | ||
48 | /*----- Main code ---------------------------------------------------------*/ | |
49 | ||
50 | static void version(FILE *fp) | |
51 | { pquis(fp, "$ (xtoys version " VERSION ")\n"); } | |
52 | ||
53 | static void usage(FILE *fp) | |
54 | { pquis(fp, "Usage: $ [-as] [-d display]\n"); } | |
55 | ||
56 | static void help(FILE *fp) | |
57 | { | |
58 | version(fp); | |
59 | fputc('\n', fp); | |
60 | usage(stdout); | |
61 | fputs("\n\ | |
62 | Repaint the X display (or just one screen).\n\ | |
63 | \n\ | |
64 | Options:\n\ | |
65 | \n\ | |
66 | -h, --help Display this help text\n\ | |
67 | -u, --usage Display a short usage summary\n\ | |
68 | -v, --version Display the program's version number\n\ | |
69 | \n\ | |
70 | -a, --all Repaint all of the screens on the display\n\ | |
71 | -d, --display=DISPLAY Choose X display to connect to\n\ | |
72 | -s, --screen Only repaint the selected screen\n", | |
73 | fp); | |
74 | } | |
75 | ||
69353127 | 76 | static Window cover_screen(Screen *sc) |
dd6d43a6 | 77 | { |
69353127 | 78 | /* Make, map, and return a window completely covering the screen SC. */ |
dd6d43a6 MW |
79 | |
80 | Window w; | |
81 | XSetWindowAttributes attr; | |
dd6d43a6 MW |
82 | |
83 | attr.background_pixel = 0; | |
c3d5f88d MW |
84 | attr.event_mask = |
85 | StructureNotifyMask | VisibilityChangeMask | ExposureMask | | |
86 | KeyPressMask | ButtonPressMask; | |
dd6d43a6 MW |
87 | attr.override_redirect = True; |
88 | w = XCreateWindow(dpy, RootWindowOfScreen(sc), | |
89 | 0, 0, WidthOfScreen(sc), HeightOfScreen(sc), | |
90 | 0, CopyFromParent, InputOutput, | |
91 | DefaultVisualOfScreen(sc), | |
92 | CWBackPixel | CWEventMask | CWOverrideRedirect, &attr); | |
93 | XMapWindow(dpy, w); | |
69353127 | 94 | return (w); |
dd6d43a6 MW |
95 | } |
96 | ||
97 | int main(int argc, char *argv[]) | |
98 | { | |
99 | const char *display = 0; | |
100 | unsigned f = 0; | |
101 | struct timeval tv; | |
69353127 MW |
102 | XEvent ev; |
103 | Window *win, w; | |
104 | int i, n; | |
dd6d43a6 MW |
105 | |
106 | #define f_only 1u | |
107 | #define f_bogus 2u | |
108 | ||
109 | /* Parse command line options. */ | |
110 | ego(argv[0]); | |
111 | for (;;) { | |
112 | static struct option opt[] = { | |
113 | { "help", 0, 0, 'h' }, | |
114 | { "usage", 0, 0, 'u' }, | |
115 | { "version", 0, 0, 'v' }, | |
116 | { "all", 0, 0, 'a' }, | |
117 | { "display", OPTF_ARGREQ, 0, 'd' }, | |
118 | { "screen", 0, 0, 's' }, | |
119 | { 0, 0, 0, 0 } | |
120 | }; | |
121 | int i = getopt_long(argc, argv, "huv" "ad:s", opt, 0); | |
122 | if (i < 0) break; | |
123 | switch (i) { | |
124 | case 'h': help(stdout); exit(0); break; | |
125 | case 'u': usage(stdout); exit(0); break; | |
126 | case 'v': version(stdout); exit(0); break; | |
127 | case 'a': f &= ~f_only; break; | |
128 | case 'd': display = optarg; break; | |
129 | case 's': f |= f_only; break; | |
130 | default: f |= f_bogus; break; | |
131 | } | |
132 | } | |
133 | if (optind < argc) f |= f_bogus; | |
134 | if (f & f_bogus) { usage(stderr); exit(EXIT_FAILURE); } | |
135 | ||
136 | /* Open the display. */ | |
137 | dpy = XOpenDisplay(display); | |
138 | if (!dpy) { die(EXIT_FAILURE, "couldn't open display"); } | |
139 | ||
69353127 MW |
140 | /* Annoyingly, `XClearWindow' uses `ClipByChildren' semantics, and there's |
141 | * no way to change that. The best idea I can come up with is to drop | |
142 | * windows over the top of each screen and take them away again. The | |
143 | * latter part is easy because they'll disappear when we close the | |
144 | * display. | |
145 | * | |
146 | * Start by making and mapping the windows. | |
147 | */ | |
148 | n = f&f_only ? 1 : ScreenCount(dpy); | |
149 | win = xmalloc(n*sizeof(Window)); | |
150 | if (f&f_only) | |
151 | win[0] = cover_screen(DefaultScreenOfDisplay(dpy)); | |
152 | else for (i = 0; i < n; i++) | |
153 | win[i] = cover_screen(ScreenOfDisplay(dpy, i)); | |
154 | ||
155 | /* Now we wait until they're all obviously mapped. */ | |
156 | while (n) { | |
157 | XNextEvent(dpy, &ev); | |
158 | switch (ev.type) { | |
88e87d2a MW |
159 | case MapNotify: |
160 | w = ev.xmap.window; goto window_visible; | |
161 | case VisibilityNotify: case Expose: case KeyPress: case ButtonPress: | |
69353127 MW |
162 | w = ev.xany.window; goto window_visible; |
163 | window_visible: | |
164 | for (i = 0; i < n; i++) | |
165 | if (w == win[i]) { win[i] = win[--n]; break; } | |
166 | break; | |
167 | } | |
dd6d43a6 MW |
168 | } |
169 | ||
69353127 | 170 | /* Finally, we must wait for a bit longer. This is an awful hack. */ |
dd6d43a6 MW |
171 | tv.tv_sec = 0; tv.tv_usec = 50*1000; |
172 | select(0, 0, 0, 0, &tv); | |
173 | ||
174 | /* All done. */ | |
75d55b66 | 175 | XCloseDisplay(dpy); |
dd6d43a6 MW |
176 | return (0); |
177 | } | |
178 | ||
179 | /*----- That's all, folks -------------------------------------------------*/ |