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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/Xfixes.h>
#include <X11/keysym.h>
#define DEFAULT_ZOOM_LEVEL 2
#define DEFAULT_WINDOW_SIZE 600
Display *display;
Window zoom_window;
int screen;
int screen_width, screen_height;
int running = 1;
int zoom_level = DEFAULT_ZOOM_LEVEL;
int window_size = DEFAULT_WINDOW_SIZE;
void print_usage(const char *program_name) {
printf("Usage: %s [OPTIONS]\n", program_name);
printf("Options:\n");
printf(" -z, --zoom LEVEL Zoom level (default: %d)\n", DEFAULT_ZOOM_LEVEL);
printf(" -s, --size SIZE Window size in pixels (default: %d)\n", DEFAULT_WINDOW_SIZE);
printf(" -h, --help Show this help message\n");
printf(" -q, --quit Quit the application\n");
}
void parse_arguments(int argc, char *argv[]) {
int opt;
const char *short_options = "z:s:hq";
struct option long_options[] = {
{"zoom", required_argument, 0, 'z'},
{"size", required_argument, 0, 's'},
{"help", no_argument, 0, 'h'},
{"quit", no_argument, 0, 'q'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
switch (opt) {
case 'z':
zoom_level = atoi(optarg);
if (zoom_level <= 0) {
fprintf(stderr, "Error: Zoom level must be positive\n");
exit(1);
}
break;
case 's':
window_size = atoi(optarg);
if (window_size <= 0) {
fprintf(stderr, "Error: Window size must be positive\n");
exit(1);
}
break;
case 'h':
print_usage(argv[0]);
exit(0);
case 'q':
exit(0);
default:
print_usage(argv[0]);
exit(1);
}
}
}
void init_x11() {
display = XOpenDisplay(NULL);
if (!display) {
fprintf(stderr, "Cannot open X display\n");
exit(1);
}
screen = DefaultScreen(display);
screen_width = DisplayWidth(display, screen);
screen_height = DisplayHeight(display, screen);
}
void create_zoom_window() {
zoom_window = XCreateSimpleWindow(
display,
RootWindow(display, screen),
0, 0,
window_size, window_size,
1,
BlackPixel(display, screen),
WhitePixel(display, screen)
);
XStoreName(display, zoom_window, "Xmagnify");
XSelectInput(display, zoom_window, KeyPressMask);
XMapWindow(display, zoom_window);
}
void clamp_coordinates(int *x, int *y, int width, int height) {
*x = (*x < 0) ? 0 : *x;
*y = (*y < 0) ? 0 : *y;
*x = (*x > screen_width - width) ? screen_width - width : *x;
*y = (*y > screen_height - height) ? screen_height - height : *y;
}
void handle_keypress(XEvent *event) {
KeySym keysym = XLookupKeysym(&event->xkey, 0);
if (keysym == XK_Escape || keysym == XK_q || keysym == XK_Q) {
running = 0;
}
}
void update_zoom() {
XFixesCursorImage *cursor = XFixesGetCursorImage(display);
if (!cursor) {
fprintf(stderr, "Failed to get cursor position\n");
return;
}
int capture_width = window_size / zoom_level;
int capture_height = window_size / zoom_level;
int capture_x = cursor->x - capture_width/2;
int capture_y = cursor->y - capture_height/2;
clamp_coordinates(&capture_x, &capture_y, capture_width, capture_height);
XImage *src_image = XGetImage(
display,
RootWindow(display, screen),
capture_x, capture_y,
capture_width, capture_height,
AllPlanes,
ZPixmap
);
if (!src_image) {
fprintf(stderr, "XGetImage failed\n");
XFree(cursor);
return;
}
XImage *dest_image = XCreateImage(
display,
DefaultVisual(display, screen),
DefaultDepth(display, screen),
ZPixmap,
0,
malloc(window_size * window_size * 4),
window_size, window_size,
32,
0
);
for (int y = 0; y < window_size; y++) {
for (int x = 0; x < window_size; x++) {
int src_x = x / zoom_level;
int src_y = y / zoom_level;
XPutPixel(dest_image, x, y, XGetPixel(src_image, src_x, src_y));
}
}
GC gc = XCreateGC(display, zoom_window, 0, NULL);
XPutImage(display, zoom_window, gc, dest_image, 0, 0, 0, 0, window_size, window_size);
XFreeGC(display, gc);
XDestroyImage(src_image);
free(dest_image->data);
dest_image->data = NULL;
XDestroyImage(dest_image);
XFree(cursor);
}
int main(int argc, char *argv[]) {
parse_arguments(argc, argv);
init_x11();
int event_base, error_base;
if (!XFixesQueryExtension(display, &event_base, &error_base)) {
fprintf(stderr, "XFixes not available\n");
XCloseDisplay(display);
return 1;
}
create_zoom_window();
while (running) {
while (XPending(display)) {
XEvent event;
XNextEvent(display, &event);
if (event.type == KeyPress) {
handle_keypress(&event);
}
}
update_zoom();
XFlush(display);
usleep(16000);
}
XCloseDisplay(display);
return 0;
}
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