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#include <cairo/cairo-xcb.h>
#include <cairo/cairo.h>
#include <unistd.h>
#include <xcb/xcb.h>
#include <cstdlib>
#include <iostream>
int main() {
int screen_num;
xcb_connection_t *connection = xcb_connect(NULL, &screen_num);
const xcb_setup_t *setup = xcb_get_setup(connection);
xcb_screen_iterator_t iter = xcb_setup_roots_iterator(setup);
xcb_screen_t *screen = iter.data;
uint32_t mask = XCB_CW_EVENT_MASK;
uint32_t data[] = {XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY};
int width = 500;
int height = 500;
xcb_window_t window = xcb_generate_id(connection);
xcb_create_window(connection, XCB_COPY_FROM_PARENT, window, screen->root, 0,
0, width, height, 10, XCB_WINDOW_CLASS_INPUT_OUTPUT,
screen->root_visual, mask, data);
xcb_map_window(connection, window);
xcb_flush(connection);
xcb_visualtype_t *visual_type;
for (xcb_depth_iterator_t depth_iter =
xcb_screen_allowed_depths_iterator(screen);
depth_iter.rem; xcb_depth_next(&depth_iter)) {
for (xcb_visualtype_iterator_t visual_iter =
xcb_depth_visuals_iterator(depth_iter.data);
visual_iter.rem; xcb_visualtype_next(&visual_iter)) {
if (screen->root_visual == visual_iter.data->visual_id) {
visual_type = visual_iter.data;
break;
}
}
}
cairo_surface_t *surface =
cairo_xcb_surface_create(connection, window, visual_type, width, height);
cairo_t *cairo = cairo_create(surface);
xcb_generic_event_t *e;
auto paint = [](cairo_t *cairo, int width, int height) {
cairo_set_source_rgb(cairo, 1, 1, 1);
cairo_paint(cairo);
cairo_set_source_rgb(cairo, 1, 1, 0);
cairo_set_line_width(cairo, 5);
cairo_move_to(cairo, width / 2.0, 0);
cairo_curve_to(cairo, width, 0, width, 0, width, height / 2.0);
cairo_curve_to(cairo, width, height, width, height, width / 2.0, height);
cairo_curve_to(cairo, 0, height, 0, height, 0, height / 2.0);
cairo_curve_to(cairo, 0, 0, 0, 0, width / 2.0, 0);
cairo_stroke(cairo);
};
while ((e = xcb_wait_for_event(connection))) {
switch (e->response_type & ~0x80) {
case XCB_EXPOSE: {
paint(cairo, width, height);
break;
}
case XCB_CONFIGURE_NOTIFY: {
xcb_configure_notify_event_t *event =
reinterpret_cast<xcb_configure_notify_event_t *>(e);
width = event->width;
height = event->height;
cairo_xcb_surface_set_size(surface, width, height);
paint(cairo, width, height);
break;
}
default: {
/* Unknown event type, ignore it */
break;
}
}
/* Free the Generic Event */
free(e);
}
pause();
cairo_destroy(cairo);
cairo_surface_destroy(surface);
xcb_disconnect(connection);
return 0;
}
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