backend/x11: refactor, prepare support for multiple outputs

1 files changed, 122 insertions, 0 deletions

diff --git a/backend/x11/input_device.c b/backend/x11/input_device.c
new file mode 100644
index 00000000..fb7f8b85
--- /dev/null
+++ b/backend/x11/input_device.c
@@ -0,0 +1,122 @@
+#include <wlr/interfaces/wlr_input_device.h>
+#include <wlr/interfaces/wlr_keyboard.h>
+#include <wlr/interfaces/wlr_pointer.h>
+#include <wlr/util/log.h>
+#include <xcb/xcb.h>
+#ifdef __linux__
+#include <linux/input-event-codes.h>
+#elif __FreeBSD__
+#include <dev/evdev/input-event-codes.h>
+#endif
+#include "backend/x11.h"
+#include "util/signal.h"
+
+static uint32_t xcb_button_to_wl(uint32_t button) {
+	switch (button) {
+	case XCB_BUTTON_INDEX_1: return BTN_LEFT;
+	case XCB_BUTTON_INDEX_2: return BTN_MIDDLE;
+	case XCB_BUTTON_INDEX_3: return BTN_RIGHT;
+	// XXX: I'm not sure the scroll-wheel direction is right
+	case XCB_BUTTON_INDEX_4: return BTN_GEAR_UP;
+	case XCB_BUTTON_INDEX_5: return BTN_GEAR_DOWN;
+	default: return 0;
+	}
+}
+
+bool x11_handle_input_event(struct wlr_x11_backend *x11,
+		xcb_generic_event_t *event) {
+	switch (event->response_type & XCB_EVENT_RESPONSE_TYPE_MASK) {
+	case XCB_KEY_PRESS:
+	case XCB_KEY_RELEASE: {
+		xcb_key_press_event_t *ev = (xcb_key_press_event_t *)event;
+		struct wlr_event_keyboard_key key = {
+			.time_msec = ev->time,
+			.keycode = ev->detail - 8,
+			.state = event->response_type == XCB_KEY_PRESS ?
+				WLR_KEY_PRESSED : WLR_KEY_RELEASED,
+			.update_state = true,
+		};
+
+		// TODO use xcb-xkb for more precise modifiers state?
+		wlr_keyboard_notify_key(&x11->keyboard, &key);
+		x11->time = ev->time;
+		return true;
+	}
+	case XCB_BUTTON_PRESS: {
+		xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event;
+
+		if (ev->detail == XCB_BUTTON_INDEX_4 ||
+				ev->detail == XCB_BUTTON_INDEX_5) {
+			double delta = (ev->detail == XCB_BUTTON_INDEX_4 ? -15 : 15);
+			struct wlr_event_pointer_axis axis = {
+				.device = &x11->pointer_dev,
+				.time_msec = ev->time,
+				.source = WLR_AXIS_SOURCE_WHEEL,
+				.orientation = WLR_AXIS_ORIENTATION_VERTICAL,
+				.delta = delta,
+			};
+			wlr_signal_emit_safe(&x11->pointer.events.axis, &axis);
+			x11->time = ev->time;
+			break;
+		}
+	}
+	/* fallthrough */
+	case XCB_BUTTON_RELEASE: {
+		xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event;
+
+		if (ev->detail != XCB_BUTTON_INDEX_4 &&
+				ev->detail != XCB_BUTTON_INDEX_5) {
+			struct wlr_event_pointer_button button = {
+				.device = &x11->pointer_dev,
+				.time_msec = ev->time,
+				.button = xcb_button_to_wl(ev->detail),
+				.state = event->response_type == XCB_BUTTON_PRESS ?
+					WLR_BUTTON_PRESSED : WLR_BUTTON_RELEASED,
+			};
+
+			wlr_signal_emit_safe(&x11->pointer.events.button, &button);
+		}
+		x11->time = ev->time;
+		return true;
+	}
+	case XCB_MOTION_NOTIFY: {
+		xcb_motion_notify_event_t *ev = (xcb_motion_notify_event_t *)event;
+
+		struct wlr_x11_output *output =
+			x11_output_from_window_id(x11, ev->event);
+		if (output == NULL) {
+			return false;
+		}
+
+		struct wlr_event_pointer_motion_absolute abs = {
+			.device = &x11->pointer_dev,
+			.time_msec = ev->time,
+			.x = (double)ev->event_x / output->wlr_output.width,
+			.y = (double)ev->event_y / output->wlr_output.height,
+		};
+
+		wlr_signal_emit_safe(&x11->pointer.events.motion_absolute, &abs);
+		x11->time = ev->time;
+		return true;
+	}
+	default:
+#ifdef WLR_HAS_XCB_XKB
+		if (x11->xkb_supported && event->response_type == x11->xkb_base_event) {
+			xcb_xkb_state_notify_event_t *ev =
+				(xcb_xkb_state_notify_event_t *)event;
+			wlr_keyboard_notify_modifiers(&x11->keyboard, ev->baseMods,
+				ev->latchedMods, ev->lockedMods, ev->lockedGroup);
+			return true;
+		}
+#endif
+		break;
+	}
+
+	return false;
+}
+
+const struct wlr_input_device_impl input_device_impl = { 0 };
+
+bool wlr_input_device_is_x11(struct wlr_input_device *wlr_dev) {
+	return wlr_dev->impl == &input_device_impl;
+}