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clutter/evdev: Add ClutterInputDeviceEvdev::output-aspect-ratio

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When != 0, this property will express the W:H ratio of the desired
output area (be it one monitor or the span of all monitors). At
the time of translating coordinates, coordinates will be skewed so
that the input area of the tablet is a rectangle of the given ratio.

Events happening in the input areas that fall outside the output
aspect ratio will be clamped to the nearest coordinate in the rect.

If the ratio is 0, the whole input area of the tablet will be used
and no coordinate skewing will happen.

https://bugzilla.gnome.org/show_bug.cgi?id=774115
This commit is contained in:
Carlos Garnacho 2016-11-08 18:18:07 +01:00
parent cc838ead8b
commit 1ff9bbd59c
2 changed files with 33 additions and 0 deletions
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31
clutter/clutter/evdev/clutter-input-device-evdev.c
View File

@ -48,6 +48,7 @@ G_DEFINE_TYPE (ClutterInputDeviceEvdev,
enum {
PROP_0,
PROP_DEVICE_MATRIX,
PROP_OUTPUT_ASPECT_RATIO,
N_PROPS
};
@ -87,6 +88,9 @@ clutter_input_device_evdev_set_property (GObject *object,
&device->device_matrix, matrix);
break;
}
case PROP_OUTPUT_ASPECT_RATIO:
device->output_ratio = g_value_get_double (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
@ -105,6 +109,9 @@ clutter_input_device_evdev_get_property (GObject *object,
case PROP_DEVICE_MATRIX:
g_value_set_boxed (value, &device->device_matrix);
break;
case PROP_OUTPUT_ASPECT_RATIO:
g_value_set_double (value, device->output_ratio);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
@ -177,6 +184,12 @@ clutter_input_device_evdev_class_init (ClutterInputDeviceEvdevClass *klass)
P_("Device input matrix"),
CAIRO_GOBJECT_TYPE_MATRIX,
CLUTTER_PARAM_READWRITE);
obj_props[PROP_OUTPUT_ASPECT_RATIO] =
g_param_spec_double ("output-aspect-ratio",
P_("Output aspect ratio"),
P_("Output aspect ratio"),
0, G_MAXDOUBLE, 0,
CLUTTER_PARAM_READWRITE);
g_object_class_install_properties (object_class, N_PROPS, obj_props);
}
@ -185,6 +198,8 @@ static void
clutter_input_device_evdev_init (ClutterInputDeviceEvdev *self)
{
cairo_matrix_init_identity (&self->device_matrix);
self->device_aspect_ratio = 0;
self->output_ratio = 0;
}
/*
@ -207,6 +222,7 @@ _clutter_input_device_evdev_new (ClutterDeviceManager *manager,
gchar *vendor, *product;
gint device_id, n_rings = 0, n_strips = 0, n_groups = 1;
gchar *node_path;
gdouble width, height;
type = _clutter_input_device_evdev_determine_type (libinput_device);
vendor = g_strdup_printf ("%.4x", libinput_device_get_id_vendor (libinput_device));
@ -246,6 +262,9 @@ _clutter_input_device_evdev_new (ClutterDeviceManager *manager,
g_free (vendor);
g_free (product);
if (libinput_device_get_size (libinput_device, &width, &height) == 0)
device->device_aspect_ratio = width / height;
return CLUTTER_INPUT_DEVICE (device);
}
@ -394,6 +413,18 @@ clutter_input_device_evdev_translate_coordinates (ClutterInputDevice *device,
x_d = *x / stage_width;
y_d = *y / stage_height;
/* Apply aspect ratio */
if (device_evdev->output_ratio > 0 &&
device_evdev->device_aspect_ratio > 0)
{
gdouble ratio = device_evdev->device_aspect_ratio / device_evdev->output_ratio;
if (ratio > 1)
x_d *= ratio;
else if (ratio < 1)
y_d *= 1 / ratio;
}
cairo_matrix_transform_point (&device_evdev->device_matrix, &min_x, &min_y);
cairo_matrix_transform_point (&device_evdev->device_matrix, &max_x, &max_y);
cairo_matrix_transform_point (&device_evdev->device_matrix, &x_d, &y_d);

2
clutter/clutter/evdev/clutter-input-device-evdev.h
View File

@ -68,6 +68,8 @@ struct _ClutterInputDeviceEvdev
ClutterInputDeviceTool *last_tool;
cairo_matrix_t device_matrix;
gdouble device_aspect_ratio; /* w:h */
gdouble output_ratio; /* w:h */
};
GType _clutter_input_device_evdev_get_type (void) G_GNUC_CONST;