[PATCH libinput 1/2] tablet: Add libinput_tablet_has_axis()

[Stephen Chandler Paul]

Checks whether or not the tablet can report the specified axis, so callers can
get an idea of a tablet's capabilities.

Signed-off-by: Stephen Chandler Paul <thatslyude at gmail.com>
---
 src/evdev-tablet.c |  8 ++++++++
 src/evdev.h        |  3 +++
 src/libinput.c     | 14 ++++++++++++++
 src/libinput.h     | 13 +++++++++++++
 4 files changed, 38 insertions(+)

diff --git a/src/evdev-tablet.c b/src/evdev-tablet.c
index 31dd8d7..954c77b 100644
--- a/src/evdev-tablet.c
+++ b/src/evdev-tablet.c
@@ -512,3 +512,11 @@ evdev_tablet_create(struct evdev_device *device)
 
 	return &tablet->base;
 }
+
+int
+evdev_tablet_has_axis(struct evdev_device *device, enum libinput_tablet_axis axis)
+{
+	return libevdev_has_event_code(device->evdev,
+				       EV_ABS,
+				       axis_to_evcode(axis));
+}
diff --git a/src/evdev.h b/src/evdev.h
index bfa47b1..5447503 100644
--- a/src/evdev.h
+++ b/src/evdev.h
@@ -130,6 +130,9 @@ evdev_mt_touchpad_create(struct evdev_device *device);
 struct evdev_dispatch *
 evdev_tablet_create(struct evdev_device *device);
 
+int
+evdev_tablet_has_axis(struct evdev_device *device, enum libinput_tablet_axis axis);
+
 void
 evdev_device_proces_event(struct libinput_event *event);
 
diff --git a/src/libinput.c b/src/libinput.c
index 9aa7cbc..a7de795 100644
--- a/src/libinput.c
+++ b/src/libinput.c
@@ -587,6 +587,20 @@ libinput_event_tablet_get_seat_button_count(struct libinput_event_tablet *event)
 	return event->seat_button_count;
 }
 
+LIBINPUT_EXPORT int
+libinput_tablet_has_axis(struct libinput_device *device,
+			 enum libinput_tablet_axis axis)
+{
+	struct evdev_device *evdev_device = NULL;
+
+	if (!libinput_device_has_capability(device, LIBINPUT_DEVICE_CAP_TABLET))
+		return 0;
+
+	evdev_device = container_of(device, evdev_device, base);
+
+	return evdev_tablet_has_axis(evdev_device, axis);
+}
+
 LIBINPUT_EXPORT enum libinput_tool_type
 libinput_tool_get_type(struct libinput_tool *tool)
 {
diff --git a/src/libinput.h b/src/libinput.h
index a9ad379..bde15a1 100644
--- a/src/libinput.h
+++ b/src/libinput.h
@@ -362,6 +362,19 @@ struct libinput_device *
 libinput_event_get_device(struct libinput_event *event);
 
 /**
+ * @ingroup device
+ *
+ * Checks whether or not a tablet supports the specified axis. The device must
+ * have the @ref LIBINPUT_DEVICE_CAP_TABLET capability.
+ *
+ * @return 1 if the axis is supported, 0 if the axis is not supported or the
+ * device does not have the @ref LIBINPUT_DEVICE_CAP_TABLET capability.
+ */
+int
+libinput_tablet_has_axis(struct libinput_device *device,
+			 enum libinput_tablet_axis axis);
+
+/**
  * @ingroup event
  *
  * Return the pointer event that is this input event. If the event type does
-- 
1.8.5.5