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225 lines
5.5 KiB
225 lines
5.5 KiB
/* xrectsel.c -- print the geometry of a rectangular screen region.
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Copyright (C) 2011-2014 lolilolicon <lolilolicon@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include <X11/cursorfont.h>
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#define die(args...) do {error(args); exit(EXIT_FAILURE); } while(0)
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typedef struct Region Region;
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struct Region {
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Window root;
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int x; /* offset from left of screen */
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int y; /* offset from top of screen */
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int X; /* offset from right of screen */
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int Y; /* offset from bottom of screen */
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unsigned int w; /* width */
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unsigned int h; /* height */
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unsigned int b; /* border_width */
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unsigned int d; /* depth */
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};
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static void error(const char *errstr, ...);
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static int print_region_attr(const char *fmt, Region region);
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static int select_region(Display *dpy, Window root, Region *region);
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int main(int argc, const char *argv[])
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{
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Display *dpy;
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Window root;
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Region sr; /* selected region */
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const char *fmt; /* format string */
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dpy = XOpenDisplay(NULL);
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if (!dpy) {
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die("failed to open display %s\n", getenv("DISPLAY"));
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}
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root = DefaultRootWindow(dpy);
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fmt = argc > 1 ? argv[1] : "%wx%h+%x+%y\n";
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/* interactively select a rectangular region */
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if (select_region(dpy, root, &sr) != EXIT_SUCCESS) {
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XCloseDisplay(dpy);
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die("failed to select a rectangular region\n");
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}
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print_region_attr(fmt, sr);
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XCloseDisplay(dpy);
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return EXIT_SUCCESS;
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}
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static void error(const char *errstr, ...)
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{
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va_list ap;
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fprintf(stderr, "xrectsel: ");
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va_start(ap, errstr);
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vfprintf(stderr, errstr, ap);
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va_end(ap);
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}
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static int print_region_attr(const char *fmt, Region region)
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{
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const char *s;
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for (s = fmt; *s; ++s) {
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if (*s == '%') {
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switch (*++s) {
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case '%':
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putchar('%');
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break;
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case 'x':
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printf("%i", region.x);
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break;
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case 'y':
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printf("%i", region.y);
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break;
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case 'X':
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printf("%i", region.X);
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break;
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case 'Y':
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printf("%i", region.Y);
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break;
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case 'w':
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printf("%u", region.w);
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break;
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case 'h':
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printf("%u", region.h);
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break;
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case 'b':
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printf("%u", region.b);
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break;
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case 'd':
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printf("%u", region.d);
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break;
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}
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} else {
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putchar(*s);
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}
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}
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return 0;
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}
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static int select_region(Display *dpy, Window root, Region *region)
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{
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XEvent ev;
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GC sel_gc;
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XGCValues sel_gv;
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int done = 0, btn_pressed = 0;
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int x = 0, y = 0;
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unsigned int width = 0, height = 0;
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int start_x = 0, start_y = 0;
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Cursor cursor;
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cursor = XCreateFontCursor(dpy, XC_crosshair);
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/* Grab pointer for these events */
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XGrabPointer(dpy, root, True, PointerMotionMask | ButtonPressMask | ButtonReleaseMask,
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GrabModeAsync, GrabModeAsync, None, cursor, CurrentTime);
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sel_gv.function = GXinvert;
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sel_gv.subwindow_mode = IncludeInferiors;
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sel_gv.line_width = 1;
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sel_gc = XCreateGC(dpy, root, GCFunction | GCSubwindowMode | GCLineWidth, &sel_gv);
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for (;;) {
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XNextEvent(dpy, &ev);
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switch (ev.type) {
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case ButtonPress:
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btn_pressed = 1;
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x = start_x = ev.xbutton.x_root;
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y = start_y = ev.xbutton.y_root;
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width = height = 0;
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break;
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case MotionNotify:
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/* Draw only if button is pressed */
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if (btn_pressed) {
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/* Re-draw last Rectangle to clear it */
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XDrawRectangle(dpy, root, sel_gc, x, y, width, height);
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x = ev.xbutton.x_root;
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y = ev.xbutton.y_root;
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if (x > start_x) {
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width = x - start_x;
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x = start_x;
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} else {
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width = start_x - x;
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}
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if (y > start_y) {
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height = y - start_y;
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y = start_y;
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} else {
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height = start_y - y;
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}
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/* Draw Rectangle */
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XDrawRectangle(dpy, root, sel_gc, x, y, width, height);
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XFlush(dpy);
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}
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break;
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case ButtonRelease:
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done = 1;
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break;
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default:
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break;
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}
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if (done)
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break;
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}
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/* Re-draw last Rectangle to clear it */
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XDrawRectangle(dpy, root, sel_gc, x, y, width, height);
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XFlush(dpy);
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XUngrabPointer(dpy, CurrentTime);
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XFreeCursor(dpy, cursor);
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XFreeGC(dpy, sel_gc);
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XSync(dpy, 1);
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Region rr; /* root region */
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Region sr; /* selected region */
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if (False == XGetGeometry(dpy, root, &rr.root, &rr.x, &rr.y, &rr.w, &rr.h, &rr.b, &rr.d)) {
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error("failed to get root window geometry\n");
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return EXIT_FAILURE;
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}
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sr.x = x;
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sr.y = y;
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sr.w = width;
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sr.h = height;
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/* calculate right and bottom offset */
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sr.X = rr.w - sr.x - sr.w;
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sr.Y = rr.h - sr.y - sr.h;
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/* those doesn't really make sense but should be set */
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sr.b = rr.b;
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sr.d = rr.d;
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*region = sr;
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return EXIT_SUCCESS;
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}
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