[PATCH v1] Added touch support to wayland backend

[Imran Zaman]

Nested westons (with wayland backend as child weston) is one possible
use case for the needed touch support.

Signed-off-by: Imran Zaman <imran.zaman at gmail.com>
---
 src/compositor-wayland.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/src/compositor-wayland.c b/src/compositor-wayland.c
index 65bce39..f125210 100644
--- a/src/compositor-wayland.c
+++ b/src/compositor-wayland.c
@@ -1581,6 +1581,53 @@ static const struct wl_keyboard_listener keyboard_listener = {
 };
 
 static void
+input_handle_touch_down(void *data, struct wl_touch *wl_touch,
+		        uint32_t serial, uint32_t time,
+		        struct wl_surface *surface, int32_t id, wl_fixed_t x_w,
+		        wl_fixed_t y_w)
+{
+	struct wayland_input *input = data;
+	notify_touch(&input->base, time, id, x_w, y_w, WL_TOUCH_DOWN);
+}
+
+static void
+input_handle_touch_up(void *data, struct wl_touch *wl_touch,
+		      uint32_t serial, uint32_t time, int32_t id)
+{
+	struct wayland_input *input = data;
+	notify_touch(&input->base, time, id, 0, 0, WL_TOUCH_UP);
+}
+
+static void
+input_handle_touch_motion(void *data, struct wl_touch *wl_touch,
+			  uint32_t time, int32_t id, wl_fixed_t x_w,
+			  wl_fixed_t y_w)
+{
+	struct wayland_input *input = data;
+	notify_touch(&input->base, time, id, x_w, y_w, WL_TOUCH_MOTION);
+}
+
+static void
+input_handle_touch_frame(void *data, struct wl_touch *wl_touch)
+{
+	struct wayland_input *input = data;
+	notify_touch_frame(&input->base);
+}
+
+static void
+input_handle_touch_cancel(void *data, struct wl_touch *wl_touch)
+{
+}
+
+static const struct wl_touch_listener touch_listener = {
+		input_handle_touch_down,
+		input_handle_touch_up,
+		input_handle_touch_motion,
+		input_handle_touch_frame,
+		input_handle_touch_cancel,
+};
+
+static void
 input_handle_capabilities(void *data, struct wl_seat *seat,
 		          enum wl_seat_capability caps)
 {
@@ -1606,6 +1653,18 @@ input_handle_capabilities(void *data, struct wl_seat *seat,
 		wl_keyboard_destroy(input->parent.keyboard);
 		input->parent.keyboard = NULL;
 	}
+
+	if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !input->parent.touch) {
+		input->parent.touch = wl_seat_get_touch(seat);
+		weston_seat_init_touch (&input->base);
+		wl_touch_set_user_data(input->parent.touch, input);
+		wl_touch_add_listener(input->parent.touch,
+				&touch_listener, input);
+	} else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && input->parent.touch) {
+		weston_seat_release_touch (&input->base);
+		wl_touch_destroy(input->parent.touch);
+		input->parent.touch = NULL;
+	}
 }
 
 static void
-- 
1.9.1