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authorPeter Hutterer <peter.hutterer@who-t.net>2015-11-16 16:36:05 +1000
committerPeter Hutterer <peter.hutterer@who-t.net>2015-11-18 12:13:54 +1000
commit4677c48ab66c90cda2b66f57061401482f6d9f09 (patch)
tree3e8c2aebf5c7b4f52688a47a81931af5451389d9 /doc
parentabb98d57381aef15a07f0da311eaffae0b057c33 (diff)
doc: tablet documentation updates
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'doc')
-rw-r--r--doc/svg/tablet.svg199
-rw-r--r--doc/tablet-support.dox52
2 files changed, 248 insertions, 3 deletions
diff --git a/doc/svg/tablet.svg b/doc/svg/tablet.svg
new file mode 100644
index 00000000..7a9dda83
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+++ b/doc/svg/tablet.svg
@@ -0,0 +1,199 @@
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diff --git a/doc/tablet-support.dox b/doc/tablet-support.dox
index 47ad0054..24d08d20 100644
--- a/doc/tablet-support.dox
+++ b/doc/tablet-support.dox
@@ -6,7 +6,53 @@ support in libinput. Note that the term "tablet" in libinput refers to
graphics tablets only (e.g. Wacom Intuos), not to tablet devices like the
Apple iPad.
-@section fake-proximity Handling of proximity events
+@image html tablet.svg "Illustration of a graphics tablet"
+
+@section tablet-tools Tablet buttons vs. tablet tools
+
+Most tablets provide two types of devices. The pysical tablet often provides
+a number of buttons and a touch ring or strip. Interaction on the drawing
+surface of the tablet requires a tool, usually in the shape of a stylus.
+The libinput interface exposed by devices with the @ref
+LIBINPUT_DEVICE_CAP_TABLET_TOOL applies only to events generated by tools.
+
+Touch events on the tablet itself are exposed
+through the @ref LIBINPUT_DEVICE_CAP_TOUCH capability and are often found on
+a separate libinput device. See libinput_device_get_device_group() for
+information on how to associate the touch part with other devices exposed by
+the same physical hardware.
+
+@section tablet-tip Tool tip events vs. button events
+
+The primary use of a tablet tool is to draw on the surface of the tablet.
+When the tool tip comes into contact with the surface, libinput sends an
+event of type @ref LIBINPUT_EVENT_TABLET_TOOL_TIP, and again when the tip
+ceases contact with the surface.
+
+Tablet tools may send button events; these are exclusively for extra buttons
+unrelated to the tip. A button event is independent of the tip and occur
+at any time.
+
+@section tablet-axes Special axes on tablet tools
+
+A tablet tool usually provides additional information beyond x/y positional
+information and the tip state. A tool may provide the distance to the tablet
+surface and the pressure exerted on the tip when in contact. Some tablets
+additionally provide tilt information along the x and y axis.
+
+@image html tablet-axes.svg "Illustration of the distance, pressure and tilt axes"
+
+The granularity and precision of these axes varies between tablet devices
+and cannot usually be mapped into a physical unit.
+libinput normalizes distance and pressure into a fixed positive 2-byte
+integer range. The tilt axes are normalized into a signed 2-byte integer
+range.
+
+While the normalization range is identical for these axes, a caller should
+not interpret identical values as identical across axes, i.e. a value V1 on
+the distance axis has no relation to the same value V1 on the pressure axis.
+
+@section tablet-fake-proximity Handling of proximity events
libinput's @ref LIBINPUT_EVENT_TABLET_TOOL_PROXIMITY events represent the
physical proximity limits of the device. In some cases the caller should
@@ -31,8 +77,8 @@ static bool in_proximity;
double value;
-value = libinput_event_pointer_get_axis_value(device,
- LIBINPUT_TABLET_AXIS_DISTANCE);
+value = libinput_event_tablet_tool_get_axis_value(device,
+ LIBINPUT_TABLET_TOOL_AXIS_DISTANCE);
if (value < min) {
min = value;