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find-cursor
mirror of https://github.com/arp242/find-cursor
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Use shaped window to pass through mouse events

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Fixes #2.
pull/4/head
Martin Tournoij 7 years ago
parent 2e7d2d725f
commit e3bb8d2d11
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4 changed files with 71 additions and 30 deletions
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21
LICENSE
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@ -0,0 +1,21 @@
The MIT License (MIT)
Copyright © 2015-2017 Martin Tournoij
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
The software is provided "as is", without warranty of any kind, express or
implied, including but not limited to the warranties of merchantability,
fitness for a particular purpose and noninfringement. In no event shall the
authors or copyright holders be liable for any claim, damages or other
liability, whether in an action of contract, tort or otherwise, arising
from, out of or in connection with the software or the use or other dealings
in the software.

2
Makefile
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@ -1,5 +1,5 @@
all:
cc find-cursor.c -o find-cursor -lX11
cc find-cursor.c -o find-cursor -lX11 -lXext -lXfixes
install:
install --strip -o root -g root find-cursor /bin/

4
README.markdown
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@ -1,6 +1,4 @@
Project status: stable
-----------------------------------------
[![This project is considered stable](https://img.shields.io/badge/Status-stable-green.svg)](https://arp242.net/status/stable)
Simple XLib program to highlight the cursor position. This is similar to the
feature found in Windows XP (and possibly later?)

74
find-cursor.c
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@ -1,6 +1,6 @@
/*
* http://code.arp242.net/find-cursor
* Copyright © 2015-2016 Martin Tournoij <martin@arp242.net>
* Copyright © 2015-2017 Martin Tournoij <martin@arp242.net>
* See below for full copyright
*/
@ -11,22 +11,17 @@
#include <string.h>
#include <unistd.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xcomposite.h>
#include <X11/extensions/Xdamage.h>
#include <X11/extensions/Xrender.h>
#include <X11/extensions/shape.h>
void usage(char *name);
int get_num(int ch, char *opt, char *name);
int parse_num(int ch, char *opt, char *name);
void draw(char *name, int size, int step, int speed, int line_width, char *color_name);
static struct option longopts[] = {
{"help", no_argument, NULL, 'h'},
{"size", required_argument, NULL, 's'},
@ -37,7 +32,6 @@ static struct option longopts[] = {
{NULL, 0, NULL, 0}
};
void usage(char *name) {
printf("Usage: %s [-stplc]\n\n", name);
printf(" -h, --help Show this help.\n");
@ -54,8 +48,8 @@ void usage(char *name) {
printf("\n");
}
int get_num(int ch, char *opt, char *name) {
// Parse number from commandline, or show error and exit if it's not a number.
int parse_num(int ch, char *opt, char *name) {
char *end;
long result = strtol(optarg, &end, 10);
if (*end) {
@ -79,20 +73,19 @@ int main(int argc, char* argv[]) {
while ((ch = getopt_long(argc, argv, "hs:t:p:l:c:r:", longopts, NULL)) != -1)
switch (ch) {
case 's':
size = get_num(ch, optarg, argv[0]);
size = parse_num(ch, optarg, argv[0]);
break;
case 't':
step = get_num(ch, optarg, argv[0]);
step = parse_num(ch, optarg, argv[0]);
break;
case 'p':
speed = get_num(ch, optarg, argv[0]);
speed = parse_num(ch, optarg, argv[0]);
break;
case 'l':
line_width = get_num(ch, optarg, argv[0]);
line_width = parse_num(ch, optarg, argv[0]);
break;
case 'c':
strncpy(color_name, optarg, sizeof(color_name));
printf("c: %s\n", color_name);
break;
case 'h':
usage(argv[0]);
@ -108,7 +101,6 @@ int main(int argc, char* argv[]) {
draw(argv[0], size, step, speed, line_width, color_name);
}
void draw(char *name, int size, int step, int speed, int line_width, char *color_name) {
// Setup display and such
char *display_name = getenv("DISPLAY");
@ -120,6 +112,12 @@ void draw(char *name, int size, int step, int speed, int line_width, char *color
Display *display = XOpenDisplay(display_name);
int screen = DefaultScreen(display);
int shape_event_base, shape_error_base;
if (!XShapeQueryExtension(display, &shape_event_base, &shape_error_base)) {
fprintf(stderr, "%s: no XShape extension for display '%s'\n", name, display_name);
exit(1);
}
// Get the mouse cursor position
int win_x, win_y, root_x, root_y = 0;
unsigned int mask = 0;
@ -134,13 +132,37 @@ void draw(char *name, int size, int step, int speed, int line_width, char *color
Window window = XCreateWindow(display, XRootWindow(display, screen),
root_x - size/2, root_y - size/2, // x, y position
size, size, // width, height
0, // border width
4, // border width
DefaultDepth(display, screen), // depth
CopyFromParent, // class
DefaultVisual(display, screen), // visual
CWOverrideRedirect, // valuemask
&window_attr // attributes
);
// Make round shaped window.
XGCValues xgcv;
Pixmap shape_mask = XCreatePixmap(display, window, size, size, 1);
GC part_shape = XCreateGC(display, shape_mask, 0, &xgcv);
XSetForeground(display, part_shape, 0);
XFillRectangle(display, shape_mask, part_shape, 0, 0, size, size);
XSetForeground(display, part_shape, 1);
XFillArc(display, shape_mask, part_shape,
0, 0, // x, y position
size, size, // Size
0, 360 * 64); // Make it a full circle
XShapeCombineMask(display, window, ShapeBounding, 0,0, shape_mask, ShapeSet);
XShapeCombineMask(display, window, ShapeClip, 0,0, shape_mask, ShapeSet);
XFreePixmap(display, shape_mask);
// Input region is small so we can pass input events.
XRectangle rect;
XserverRegion region = XFixesCreateRegion(display, &rect, 1);
XFixesSetWindowShapeRegion(display, window, ShapeInput, 0, 0, region);
XFixesDestroyRegion(display, region);
// Set attrs
XMapWindow(display, window);
XStoreName(display, window, "find-cursor");
@ -162,14 +184,13 @@ void draw(char *name, int size, int step, int speed, int line_width, char *color
e.xclient.data.l[1] = XInternAtom(display, "_NET_WM_STATE_STAYS_ON_TOP", False);
XSendEvent(display, XRootWindow(display, screen), False, SubstructureRedirectMask, &e);
// Setting this makes sure compositing window managers don't apply
// shadows and such
// Make sure compositing window managers don't apply shadows and such.
// https://specifications.freedesktop.org/wm-spec/1.4/ar01s05.html
// https://wiki.archlinux.org/index.php/Compton
Atom type_util = XInternAtom(display, "_NET_WM_WINDOW_TYPE", 0);
Atom type = XInternAtom(display, "_NET_WM_WINDOW_TYPE_MENU", 0);
XChangeProperty(display, window, type,
XA_ATOM, 32, PropModeReplace, (unsigned char *)&type_util, 1);
XChangeProperty(display, window, type, XA_ATOM, 32, PropModeReplace,
(unsigned char *)&type_util, 1);
XRaiseWindow(display, window);
XFlush(display);
@ -195,6 +216,7 @@ void draw(char *name, int size, int step, int speed, int line_width, char *color
XSync(display, False);
usleep(speed * 100);
}
XFreeGC(display, gc);
XCloseDisplay(display);
}
@ -202,19 +224,19 @@ void draw(char *name, int size, int step, int speed, int line_width, char *color
/*
* The MIT License (MIT)
*
* Copyright © 2015-2016 Martin Tournoij
*
*
* Copyright © 2015-2017 Martin Tournoij
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
*
* The software is provided "as is", without warranty of any kind, express or
* implied, including but not limited to the warranties of merchantability,
* fitness for a particular purpose and noninfringement. In no event shall the

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