| 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 | |
| 39 | #include <mLib/alloc.h> |
| 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 | |
| 76 | static Window cover_screen(Screen *sc) |
| 77 | { |
| 78 | /* Make, map, and return a window completely covering the screen SC. */ |
| 79 | |
| 80 | Window w; |
| 81 | XSetWindowAttributes attr; |
| 82 | |
| 83 | attr.background_pixel = 0; |
| 84 | attr.event_mask = |
| 85 | StructureNotifyMask | VisibilityChangeMask | ExposureMask | |
| 86 | KeyPressMask | ButtonPressMask; |
| 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); |
| 94 | return (w); |
| 95 | } |
| 96 | |
| 97 | int main(int argc, char *argv[]) |
| 98 | { |
| 99 | const char *display = 0; |
| 100 | unsigned f = 0; |
| 101 | struct timeval tv; |
| 102 | XEvent ev; |
| 103 | Window *win, w; |
| 104 | int i, n; |
| 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 | |
| 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) { |
| 159 | case MapNotify: |
| 160 | w = ev.xmap.window; goto window_visible; |
| 161 | case VisibilityNotify: case Expose: case KeyPress: case ButtonPress: |
| 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 | } |
| 168 | } |
| 169 | |
| 170 | /* Finally, we must wait for a bit longer. This is an awful hack. */ |
| 171 | tv.tv_sec = 0; tv.tv_usec = 50*1000; |
| 172 | select(0, 0, 0, 0, &tv); |
| 173 | |
| 174 | /* All done. */ |
| 175 | XCloseDisplay(dpy); |
| 176 | return (0); |
| 177 | } |
| 178 | |
| 179 | /*----- That's all, folks -------------------------------------------------*/ |