basic x bullshittery

x11/Makefile

@@ -0,0 +1,18 @@
+CC = gcc
+CFLAGS = -Wall -g
+LDFLAGS = -lX11
+TARGET = a.out
+SRC = *.c
+
+all: $(TARGET)
+
+$(TARGET): $(SRC)
+	$(CC) $(CFLAGS) -o $(TARGET) $(SRC) $(LDFLAGS)
+
+clean:
+	rm -f $(TARGET)
+
+run: $(TARGET)
+	$(MAKE) clean
+	$(MAKE) all
+	./$(TARGET)

x11/xHandler.c

@@ -0,0 +1,94 @@
+#include <X11/Xlib.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <X11/keysym.h>
+#include <stdbool.h>
+
+int WIDTH = 1920;
+int HEIGHT = 1080;
+
+void hex_color(XColor *color, Display *display, Colormap cm, const char *hexcode) {
+    XParseColor(display, cm, hexcode, color);
+    XAllocColor(display, cm, color);
+}
+
+void fill_color(Display *display, Window window, GC gc, Colormap cm, const char *hexcode) {
+    XColor color;
+    hex_color(&color, display, cm, hexcode);
+    XSetForeground(display, gc, color.pixel);
+    XFillRectangle(display, window, gc, 0, 0, WIDTH, HEIGHT);
+}
+
+void fill_black(Display *display, Window window, GC gc, Colormap cm) {
+    fill_color(display, window, gc, cm, "#000000");
+}
+
+void fill_white(Display *display, Window window, GC gc, Colormap cm) {
+    fill_color(display, window, gc, cm, "#FFFFFF");
+}
+
+int main(void) {
+    Display *display;
+    Window window;
+    int screen;
+    XEvent event;
+    
+    display = XOpenDisplay(NULL);
+    if (display == NULL) {
+        fprintf(stderr, "Cannot open display\n");
+        exit(1);
+    }
+    
+    screen = DefaultScreen(display);
+    window = XCreateSimpleWindow(display, RootWindow(display, screen), 100, 100,
+                                WIDTH, HEIGHT, 1, BlackPixel(display, screen),
+                                WhitePixel(display, screen));
+    
+    XSelectInput(display, window, ExposureMask | KeyPressMask);
+    XMapWindow(display, window);
+    
+    GC gc = XCreateGC(display, window, 0, NULL);
+    Colormap cm = DefaultColormap(display, screen);
+    
+    XColor black;
+    hex_color(&black, display, cm, "#000000");
+
+    XColor white;
+    hex_color(&white, display, cm, "#FFFFFF");
+
+    while (1) {
+        XNextEvent(display, &event);
+        if (event.type == Expose) {
+            // loop forever (until q)
+            static int is_black = false;
+            while (1) {
+                // set color to black
+                XSetForeground(display, gc, black.pixel);
+                for (int i = 0; i < 50; ++i) {
+                    int x = (WIDTH / 2) + (i % 10) * 5;
+                    int y = (HEIGHT / 2) + (i / 10) * 5;
+                    XDrawRectangle(display, window, gc, x, y, 1, 1);
+                }
+                XFlush(display);
+                sleep(2);
+
+                while (XPending(display)) {
+                    XNextEvent(display, &event);
+                    if (event.type == KeyPress) {
+                        KeySym key = XLookupKeysym(&event.xkey, 0);
+                        if (key == XK_q || key == XK_Q) {
+                            printf("Stopping...\n");
+                            exit(0);
+                        }
+                    }
+                }
+            }
+        }
+    }
+    
+    XFreeGC(display, gc);
+    XDestroyWindow(display, window);
+    XCloseDisplay(display);
+    return 0;
+}