122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
// x-run: ~/scripts/runc.sh % -lX11 -lcairo -lxcb -lm
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <xcb/xcb.h>
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#include <xcb/xproto.h>
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#include <cairo/cairo.h>
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#include <cairo/cairo-xcb.h>
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#include <unistd.h>
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#include <math.h>
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#define EVENT(T, A, B) T *A = (T *)B
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void render(xcb_connection_t *connection, int wid, cairo_t *cr, int win_w, int win_h);
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int main(void) {
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xcb_connection_t *connection = xcb_connect(getenv("DISPLAY"), NULL);
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if (!connection) {
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fprintf(stderr, "xcb_connect() failed\n");
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return EXIT_FAILURE;
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}
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xcb_screen_t *screen = xcb_setup_roots_iterator(xcb_get_setup(connection)).data;
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xcb_window_t wid = xcb_generate_id(connection);
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xcb_visualtype_t *visual = NULL;
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{
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for (
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xcb_depth_iterator_t iter_depth = xcb_screen_allowed_depths_iterator(screen);
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iter_depth.rem;
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xcb_depth_next(&iter_depth)) {
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int visual_length = xcb_depth_visuals_length(iter_depth.data);
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visual = xcb_depth_visuals(iter_depth.data);
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for (int i = 0; i < visual_length; i++) {
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if (visual->visual_id == screen->root_visual) {
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goto found_visual;
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}
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}
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}
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found_visual: {}
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}
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int win_w = 150, win_h = 150;
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uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
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values[2] = {
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screen->white_pixel,
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XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY | XCB_EVENT_MASK_FOCUS_CHANGE
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};
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xcb_create_window(connection,
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XCB_COPY_FROM_PARENT,
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wid, screen->root,
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0, 0, win_w, win_h, 0,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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screen->root_visual, mask, values);
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xcb_map_window(connection, wid);
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xcb_flush(connection);
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cairo_surface_t *surface = cairo_xcb_surface_create(connection, wid, visual, win_w, win_h);
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cairo_t *cr = cairo_create(surface);
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xcb_generic_event_t *event;
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bool running = true;
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while (running) {
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while ((event = xcb_poll_for_event(connection))) {
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switch (event->response_type & ~0x80) {
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case XCB_CONFIGURE_NOTIFY:
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{
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EVENT(xcb_configure_notify_event_t, evt, event);
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if (win_w != evt->width || win_h != evt->height) {
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printf("resize %dx%d -> %dx%d\n", win_w, win_h, evt->width, evt->height);
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cairo_destroy(cr);
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surface = cairo_xcb_surface_create(connection, wid, visual, win_w, win_h);
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cr = cairo_create(surface);
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win_w = evt->width;
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win_h = evt->height;
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}
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}
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break;
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case XCB_FOCUS_IN:
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printf("focus in\n");
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break;
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case XCB_FOCUS_OUT:
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printf("focus out\n");
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break;
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case XCB_EXPOSE:
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printf("expose\n");
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break;
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case XCB_DESTROY_NOTIFY:
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cairo_destroy(cr);
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running = false;
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break;
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default:
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printf("event: %d\n", event->response_type);
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break;
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}
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free(event);
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}
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if (running) {
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render(connection, wid, cr, win_w, win_h);
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usleep(1000000 / 60);
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}
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}
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xcb_destroy_window(connection, wid);
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xcb_disconnect(connection);
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}
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void render(xcb_connection_t *connection, int wid, cairo_t *cr, int win_w, int win_h) {
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static float t = 0.0;
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xcb_clear_area(connection, 0, wid, 0, 0, 0, 0);
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cairo_set_source_rgb(cr, sin(t) * 0.5 + 0.5, cos(t) * 0.5 + 0.5, 0);
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cairo_rectangle(cr, win_w * 0.5, win_h * 0.5, sin(t) * 0.5 * win_w, cos(t) * 0.5 * win_h);
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cairo_fill(cr);
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xcb_flush(connection);
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t += 1.0 / 60.0;
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}
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