/
os_x11.go
488 lines (446 loc) · 12.1 KB
/
os_x11.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
// SPDX-License-Identifier: Unlicense OR MIT
// +build linux,!android,!nox11 freebsd
package window
/*
#cgo LDFLAGS: -lX11 -lxkbcommon -lxkbcommon-x11 -lX11-xcb
#include <stdlib.h>
#include <locale.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>
#include <X11/XKBlib.h>
#include <X11/Xlib-xcb.h>
#include <xkbcommon/xkbcommon-x11.h>
*/
import "C"
import (
"errors"
"fmt"
"image"
"strconv"
"sync"
"time"
"unsafe"
"github.com/gop9/olt/gio/f32"
"github.com/gop9/olt/gio/io/key"
"github.com/gop9/olt/gio/io/pointer"
"github.com/gop9/olt/gio/io/system"
"github.com/gop9/olt/gio/app/internal/xkb"
syscall "golang.org/x/sys/unix"
)
type x11Window struct {
w Callbacks
x *C.Display
xkb *xkb.Context
xkbEventBase C.int
xw C.Window
evDelWindow C.Atom
stage system.Stage
cfg config
width int
height int
notify struct {
read, write int
}
dead bool
mu sync.Mutex
animating bool
pointerBtns pointer.Buttons
}
func (w *x11Window) SetAnimating(anim bool) {
w.mu.Lock()
w.animating = anim
w.mu.Unlock()
if anim {
w.wakeup()
}
}
func (w *x11Window) ShowTextInput(show bool) {}
var x11OneByte = make([]byte, 1)
func (w *x11Window) wakeup() {
if _, err := syscall.Write(w.notify.write, x11OneByte); err != nil && err != syscall.EAGAIN {
panic(fmt.Errorf("failed to write to pipe: %v", err))
}
}
func (w *x11Window) display() *C.Display {
return w.x
}
func (w *x11Window) window() (C.Window, int, int) {
return w.xw, w.width, w.height
}
func (w *x11Window) setStage(s system.Stage) {
if s == w.stage {
return
}
w.stage = s
w.w.Event(system.StageEvent{s})
}
func (w *x11Window) loop() {
h := x11EventHandler{w: w, xev: new(C.XEvent), text: make([]byte, 4)}
xfd := C.XConnectionNumber(w.x)
// Poll for events and notifications.
pollfds := []syscall.PollFd{
{Fd: int32(xfd), Events: syscall.POLLIN | syscall.POLLERR},
{Fd: int32(w.notify.read), Events: syscall.POLLIN | syscall.POLLERR},
}
xEvents := &pollfds[0].Revents
// Plenty of room for a backlog of notifications.
buf := make([]byte, 100)
loop:
for !w.dead {
var syn, redraw bool
// Check for pending draw events before checking animation or blocking.
// This fixes an issue on Xephyr where on startup XPending() > 0 but
// poll will still block. This also prevents no-op calls to poll.
if syn = h.handleEvents(); !syn {
w.mu.Lock()
animating := w.animating
w.mu.Unlock()
if animating {
redraw = true
} else {
// Clear poll events.
*xEvents = 0
// Wait for X event or gio notification.
if _, err := syscall.Poll(pollfds, -1); err != nil && err != syscall.EINTR {
panic(fmt.Errorf("x11 loop: poll failed: %w", err))
}
switch {
case *xEvents&syscall.POLLIN != 0:
syn = h.handleEvents()
if w.dead {
break loop
}
case *xEvents&(syscall.POLLERR|syscall.POLLHUP) != 0:
break loop
}
}
}
// Clear notifications.
for {
_, err := syscall.Read(w.notify.read, buf)
if err == syscall.EAGAIN {
break
}
if err != nil {
panic(fmt.Errorf("x11 loop: read from notify pipe failed: %w", err))
}
redraw = true
}
if redraw || syn {
w.cfg.now = time.Now()
w.w.Event(FrameEvent{
FrameEvent: system.FrameEvent{
Size: image.Point{
X: w.width,
Y: w.height,
},
Config: &w.cfg,
},
Sync: syn,
})
}
}
w.w.Event(system.DestroyEvent{Err: nil})
}
func (w *x11Window) destroy() {
if w.notify.write != 0 {
syscall.Close(w.notify.write)
w.notify.write = 0
}
if w.notify.read != 0 {
syscall.Close(w.notify.read)
w.notify.read = 0
}
if w.xkb != nil {
w.xkb.Destroy()
w.xkb = nil
}
C.XDestroyWindow(w.x, w.xw)
C.XCloseDisplay(w.x)
}
// atom is a wrapper around XInternAtom. Callers should cache the result
// in order to limit round-trips to the X server.
//
func (w *x11Window) atom(name string, onlyIfExists bool) C.Atom {
cname := C.CString(name)
defer C.free(unsafe.Pointer(cname))
flag := C.Bool(C.False)
if onlyIfExists {
flag = C.True
}
return C.XInternAtom(w.x, cname, flag)
}
// x11EventHandler wraps static variables for the main event loop.
// Its sole purpose is to prevent heap allocation and reduce clutter
// in x11window.loop.
//
type x11EventHandler struct {
w *x11Window
text []byte
xev *C.XEvent
status C.Status
keysym C.KeySym
}
// handleEvents returns true if the window needs to be redrawn.
//
func (h *x11EventHandler) handleEvents() bool {
w := h.w
xev := h.xev
redraw := false
for C.XPending(w.x) != 0 {
C.XNextEvent(w.x, xev)
if C.XFilterEvent(xev, C.None) == C.True {
continue
}
switch _type := (*C.XAnyEvent)(unsafe.Pointer(xev))._type; _type {
case h.w.xkbEventBase:
xkbEvent := (*C.XkbAnyEvent)(unsafe.Pointer(xev))
switch xkbEvent.xkb_type {
case C.XkbNewKeyboardNotify, C.XkbMapNotify:
if err := h.w.updateXkbKeymap(); err != nil {
panic(err)
}
case C.XkbStateNotify:
state := (*C.XkbStateNotifyEvent)(unsafe.Pointer(xev))
h.w.xkb.UpdateMask(uint32(state.base_mods), uint32(state.latched_mods), uint32(state.locked_mods),
uint32(state.base_group), uint32(state.latched_group), uint32(state.locked_group))
}
case C.KeyPress:
kevt := (*C.XKeyPressedEvent)(unsafe.Pointer(xev))
for _, e := range h.w.xkb.DispatchKey(uint32(kevt.keycode)) {
w.w.Event(e)
}
case C.KeyRelease:
case C.ButtonPress, C.ButtonRelease:
bevt := (*C.XButtonEvent)(unsafe.Pointer(xev))
ev := pointer.Event{
Type: pointer.Press,
Source: pointer.Mouse,
Position: f32.Point{
X: float32(bevt.x),
Y: float32(bevt.y),
},
Time: time.Duration(bevt.time) * time.Millisecond,
}
if bevt._type == C.ButtonRelease {
ev.Type = pointer.Release
}
var btn pointer.Buttons
const scrollScale = 10
switch bevt.button {
case C.Button1:
btn = pointer.ButtonLeft
case C.Button2:
btn = pointer.ButtonMiddle
case C.Button3:
btn = pointer.ButtonRight
case C.Button4:
// scroll up
ev.Type = pointer.Move
ev.Scroll.Y = -scrollScale
case C.Button5:
// scroll down
ev.Type = pointer.Move
ev.Scroll.Y = +scrollScale
default:
continue
}
switch _type {
case C.ButtonPress:
w.pointerBtns |= btn
case C.ButtonRelease:
w.pointerBtns &^= btn
}
ev.Buttons = w.pointerBtns
w.w.Event(ev)
case C.MotionNotify:
mevt := (*C.XMotionEvent)(unsafe.Pointer(xev))
w.w.Event(pointer.Event{
Type: pointer.Move,
Source: pointer.Mouse,
Buttons: w.pointerBtns,
Position: f32.Point{
X: float32(mevt.x),
Y: float32(mevt.y),
},
Time: time.Duration(mevt.time) * time.Millisecond,
})
case C.Expose: // update
// redraw only on the last expose event
redraw = (*C.XExposeEvent)(unsafe.Pointer(xev)).count == 0
case C.FocusIn:
w.w.Event(key.FocusEvent{Focus: true})
case C.FocusOut:
w.w.Event(key.FocusEvent{Focus: false})
case C.ConfigureNotify: // window configuration change
cevt := (*C.XConfigureEvent)(unsafe.Pointer(xev))
w.width = int(cevt.width)
w.height = int(cevt.height)
// redraw will be done by a later expose event
case C.ClientMessage: // extensions
cevt := (*C.XClientMessageEvent)(unsafe.Pointer(xev))
switch *(*C.long)(unsafe.Pointer(&cevt.data)) {
case C.long(w.evDelWindow):
w.dead = true
return false
}
}
}
return redraw
}
var (
x11Threads sync.Once
)
func init() {
x11Driver = newX11Window
}
func newX11Window(gioWin Callbacks, opts *Options) error {
var err error
pipe := make([]int, 2)
if err := syscall.Pipe2(pipe, syscall.O_NONBLOCK|syscall.O_CLOEXEC); err != nil {
return fmt.Errorf("NewX11Window: failed to create pipe: %w", err)
}
x11Threads.Do(func() {
if C.XInitThreads() == 0 {
err = errors.New("x11: threads init failed")
}
C.XrmInitialize()
})
if err != nil {
return err
}
dpy := C.XOpenDisplay(nil)
if dpy == nil {
return errors.New("x11: cannot connect to the X server")
}
var major, minor C.int = C.XkbMajorVersion, C.XkbMinorVersion
var xkbEventBase C.int
if C.XkbQueryExtension(dpy, nil, &xkbEventBase, nil, &major, &minor) != C.True {
C.XCloseDisplay(dpy)
return errors.New("x11: XkbQueryExtension failed")
}
const bits = C.uint(C.XkbNewKeyboardNotifyMask | C.XkbMapNotifyMask | C.XkbStateNotifyMask)
if C.XkbSelectEvents(dpy, C.XkbUseCoreKbd, bits, bits) != C.True {
C.XCloseDisplay(dpy)
return errors.New("x11: XkbSelectEvents failed")
}
xkb, err := xkb.New()
if err != nil {
C.XCloseDisplay(dpy)
return fmt.Errorf("x11: %v", err)
}
ppsp := x11DetectUIScale(dpy)
cfg := config{pxPerDp: ppsp, pxPerSp: ppsp}
swa := C.XSetWindowAttributes{
event_mask: C.ExposureMask | C.FocusChangeMask | // update
C.KeyPressMask | C.KeyReleaseMask | // keyboard
C.ButtonPressMask | C.ButtonReleaseMask | // mouse clicks
C.PointerMotionMask | // mouse movement
C.StructureNotifyMask, // resize
background_pixmap: C.None,
override_redirect: C.False,
}
win := C.XCreateWindow(dpy, C.XDefaultRootWindow(dpy),
0, 0, C.uint(cfg.Px(opts.Width)), C.uint(cfg.Px(opts.Height)),
0, C.CopyFromParent, C.InputOutput, nil,
C.CWEventMask|C.CWBackPixmap|C.CWOverrideRedirect, &swa)
w := &x11Window{
w: gioWin, x: dpy, xw: win,
width: cfg.Px(opts.Width),
height: cfg.Px(opts.Height),
cfg: cfg,
xkb: xkb,
xkbEventBase: xkbEventBase,
}
w.notify.read = pipe[0]
w.notify.write = pipe[1]
if err := w.updateXkbKeymap(); err != nil {
w.destroy()
return err
}
var hints C.XWMHints
hints.input = C.True
hints.flags = C.InputHint
C.XSetWMHints(dpy, win, &hints)
// set the name
ctitle := C.CString(opts.Title)
defer C.free(unsafe.Pointer(ctitle))
C.XStoreName(dpy, win, ctitle)
// set _NET_WM_NAME as well for UTF-8 support in window title.
C.XSetTextProperty(dpy, win,
&C.XTextProperty{
value: (*C.uchar)(unsafe.Pointer(ctitle)),
encoding: w.atom("UTF8_STRING", false),
format: 8,
nitems: C.ulong(len(opts.Title)),
},
w.atom("_NET_WM_NAME", false))
// extensions
w.evDelWindow = w.atom("WM_DELETE_WINDOW", false)
C.XSetWMProtocols(dpy, win, &w.evDelWindow, 1)
// make the window visible on the screen
C.XMapWindow(dpy, win)
go func() {
w.w.SetDriver(w)
w.setStage(system.StageRunning)
w.loop()
w.destroy()
close(mainDone)
}()
return nil
}
// detectUIScale reports the system UI scale, or 1.0 if it fails.
func x11DetectUIScale(dpy *C.Display) float32 {
// default fixed DPI value used in most desktop UI toolkits
const defaultDesktopDPI = 96
var scale float32 = 1.0
// Get actual DPI from X resource Xft.dpi (set by GTK and Qt).
// This value is entirely based on user preferences and conflates both
// screen (UI) scaling and font scale.
rms := C.XResourceManagerString(dpy)
if rms != nil {
db := C.XrmGetStringDatabase(rms)
if db != nil {
var (
t *C.char
v C.XrmValue
)
if C.XrmGetResource(db, (*C.char)(unsafe.Pointer(&[]byte("Xft.dpi\x00")[0])),
(*C.char)(unsafe.Pointer(&[]byte("Xft.Dpi\x00")[0])), &t, &v) != C.False {
if t != nil && C.GoString(t) == "String" {
f, err := strconv.ParseFloat(C.GoString(v.addr), 32)
if err == nil {
scale = float32(f) / defaultDesktopDPI
}
}
}
C.XrmDestroyDatabase(db)
}
}
return scale
}
func (w *x11Window) updateXkbKeymap() error {
w.xkb.DestroyKeymapState()
ctx := (*C.struct_xkb_context)(unsafe.Pointer(w.xkb.Ctx))
xcb := C.XGetXCBConnection(w.x)
if xcb == nil {
return errors.New("x11: XGetXCBConnection failed")
}
xkbDevID := C.xkb_x11_get_core_keyboard_device_id(xcb)
if xkbDevID == -1 {
return errors.New("x11: xkb_x11_get_core_keyboard_device_id failed")
}
keymap := C.xkb_x11_keymap_new_from_device(ctx, xcb, xkbDevID, C.XKB_KEYMAP_COMPILE_NO_FLAGS)
if keymap == nil {
return errors.New("x11: xkb_x11_keymap_new_from_device failed")
}
state := C.xkb_x11_state_new_from_device(keymap, xcb, xkbDevID)
if state == nil {
C.xkb_keymap_unref(keymap)
return errors.New("x11: xkb_x11_keymap_new_from_device failed")
}
w.xkb.SetKeymap(unsafe.Pointer(keymap), unsafe.Pointer(state))
return nil
}