gdritter repos emenu / master
just the ability to show a crappy window Getty Ritter 6 years ago
4 changed file(s) with 328 addition(s) and 0 deletion(s). Collapse all Expand all
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.gitignore less more
1 /target
2 **/*.rs.bk
3 *~
+211
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Cargo.lock less more
1 [[package]]
2 name = "bitflags"
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+15
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Cargo.toml less more
1 [package]
2 name = "emenu"
3 version = "0.1.0"
4 authors = ["Getty Ritter <gettylefou@gmail.com>"]
5 edition = "2018"
6
7 [dependencies]
8 xcb = "*"
9 cairo-sys-rs = "0.7.0"
10 pango = "*"
11 pangocairo = "*"
12
13 [dependencies.cairo-rs]
14 version = "0.5.0"
15 features = ["xcb"]⏎
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src/main.rs less more
1 use cairo::XCBSurface;
2 use cairo::prelude::SurfaceExt;
3 use pango::LayoutExt;
4 use std::mem;
5 use xcb::ffi::*;
6
7 // this should in no way be hard-coded, but hey guess what it is
8 // right now deal with it
9 const WIDTH: i32 = 1920;
10 const HEIGHT: i32 = 38;
11
12 fn find_visual(conn: *mut xcb_connection_t, visual: xcb_visualid_t) -> *mut xcb_visualtype_t {
13 unsafe {
14 let screen_iter = xcb_setup_roots_iterator(xcb_get_setup(conn));
15 while screen_iter.rem > 0 {
16 let depth_iter = xcb_screen_allowed_depths_iterator(screen_iter.data);
17 while depth_iter.rem > 0 {
18 let visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
19 while visual_iter.rem > 0 {
20 if visual == (*visual_iter.data).visual_id {
21 return visual_iter.data;
22 }
23 xcb_visualtype_next(&visual_iter as *const xcb_visualtype_iterator_t as *mut xcb_visualtype_iterator_t);
24 }
25 xcb_depth_next(&depth_iter as *const xcb_depth_iterator_t as *mut xcb_depth_iterator_t);
26 }
27 xcb_screen_next(&screen_iter as *const xcb_screen_iterator_t as *mut xcb_screen_iterator_t);
28 }
29 std::ptr::null_mut()
30 }
31 }
32
33 fn mk_connection() -> *mut xcb_connection_t {
34 unsafe {
35 xcb_connect(std::ptr::null_mut(), std::ptr::null_mut())
36 }
37 }
38
39
40 fn mk_window(conn: *mut xcb_connection_t) -> (*mut xcb_screen_t, xcb_window_t) {
41 unsafe {
42 let screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
43 let window = xcb_generate_id(conn);
44 let mask = [1, XCB_EVENT_MASK_EXPOSURE];
45 xcb_create_window(conn, XCB_COPY_FROM_PARENT as u8, window, (*screen).root,
46 0, 0, WIDTH as u16, HEIGHT as u16, 0,
47 XCB_WINDOW_CLASS_INPUT_OUTPUT as u16,
48 (*screen).root_visual,
49 XCB_CW_OVERRIDE_REDIRECT | XCB_CW_EVENT_MASK,
50 mask.as_ptr());
51 xcb_map_window(conn, window);
52 (screen, window)
53 }
54 }
55
56 fn main () {
57 let conn = mk_connection();
58
59 let (screen, window) = mk_window(conn);
60 let visual = find_visual(conn, unsafe { (*screen).root_visual });
61
62 let s = unsafe {
63 <cairo::Surface as XCBSurface>::create(
64 &cairo::XCBConnection::from_raw_none(mem::transmute::<*mut xcb_connection_t, *mut cairo_sys::xcb_connection_t>(conn)),
65 &cairo::XCBDrawable(window),
66 &cairo::XCBVisualType::from_raw_none(mem::transmute::<*mut xcb_visualtype_t, *mut cairo_sys::xcb_visualtype_t>(visual)),
67 WIDTH,
68 HEIGHT,
69 )
70 };
71 let ctx = cairo::Context::new(&s);
72 unsafe { xcb_flush(conn); }
73
74 loop {
75 let event = unsafe { xcb_wait_for_event(conn) };
76 if let Some(e) = unsafe { event.as_ref() } {
77 if (e.response_type & !0x80) == XCB_EXPOSE {
78 ctx.set_source_rgb(0.2, 0.2, 0.2);
79 ctx.paint();
80
81 ctx.set_source_rgb(1.0, 1.0, 1.0);
82 let layout = pangocairo::functions::create_layout(&ctx).unwrap();
83 layout.set_width(1920 * 1024);
84 let font = pango::FontDescription::from_string("Fira Mono 18");
85 layout.set_font_description(&font);
86 ctx.move_to(6.0, 4.0);
87 layout.set_text("The quick brown fox jumps over the lazy dog.");
88 pangocairo::functions::show_layout(&ctx, &layout);
89 <&cairo::Surface as SurfaceExt>::flush(&&s);
90 }
91 } else {
92 break;
93 }
94 unsafe { xcb_flush(conn); }
95 }
96
97 unsafe { xcb_disconnect(conn); }
98
99 }