evdev: store the device dimensions

We use width/height often enough that storing it once is better than
calculating it on each event.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

src/evdev-mt-touchpad-buttons.c

@@ -527,8 +527,8 @@ tp_init_softbuttons(struct tp_dispatch *tp,
 	xoffset = absinfo_x->minimum,
 	yoffset = absinfo_y->minimum;
 	yres = absinfo_y->resolution;
-	width = abs(absinfo_x->maximum - absinfo_x->minimum);
-	height = abs(absinfo_y->maximum - absinfo_y->minimum);
+	width = device->abs.dimensions.x;
+	height = device->abs.dimensions.y;
 
 	/* button height: 10mm or 15% of the touchpad height,
 	   whichever is smaller */
@@ -558,8 +558,8 @@ tp_init_top_softbuttons(struct tp_dispatch *tp,
 	xoffset = absinfo_x->minimum,
 	yoffset = absinfo_y->minimum;
 	yres = absinfo_y->resolution;
-	width = abs(absinfo_x->maximum - absinfo_x->minimum);
-	height = abs(absinfo_y->maximum - absinfo_y->minimum);
+	width = device->abs.dimensions.x;
+	height = device->abs.dimensions.y;
 
 	if (tp->buttons.has_topbuttons) {
 		/* T440s has the top button line 5mm from the top, event
@@ -742,8 +742,8 @@ tp_init_buttons(struct tp_dispatch *tp,
 	   The MAGIC for resolution-less touchpads ends up as 2% of the diagonal */
 	if (device->abs.fake_resolution) {
 		const double BUTTON_MOTION_MAGIC = 0.007;
-		width = abs(absinfo_x->maximum - absinfo_x->minimum);
-		height = abs(absinfo_y->maximum - absinfo_y->minimum);
+		width = device->abs.dimensions.x;
+		height = device->abs.dimensions.y;
 		diagonal = sqrt(width*width + height*height);
 		tp->buttons.motion_dist.x_scale_coeff = diagonal * BUTTON_MOTION_MAGIC;
 		tp->buttons.motion_dist.y_scale_coeff = diagonal * BUTTON_MOTION_MAGIC;
@@ -838,10 +838,8 @@ tp_check_clickfinger_distance(struct tp_dispatch *tp,
 
 		/* Use a maximum of 30% of the touchpad width or height if
 		 * we dont' have resolution. */
-		w = tp->device->abs.absinfo_x->maximum -
-		    tp->device->abs.absinfo_x->minimum;
-		h = tp->device->abs.absinfo_y->maximum -
-		    tp->device->abs.absinfo_y->minimum;
+		w = tp->device->abs.dimensions.x;
+		h = tp->device->abs.dimensions.y;
 
 		return (x < w * 0.3 && y < h * 0.3) ? 1 : 0;
 	} else {

src/evdev-mt-touchpad-edge-scroll.c

@@ -275,8 +275,8 @@ tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device)
 	int width, height;
 	int edge_width, edge_height;
 
-	width = device->abs.absinfo_x->maximum - device->abs.absinfo_x->minimum;
-	height = device->abs.absinfo_y->maximum - device->abs.absinfo_y->minimum;
+	width = device->abs.dimensions.x;
+	height = device->abs.dimensions.y;
 
 	switch (tp->model) {
 	case MODEL_ALPS:

src/evdev-mt-touchpad.c

@@ -1402,10 +1402,8 @@ tp_init_palmdetect(struct tp_dispatch *tp,
 	tp->palm.left_edge = INT_MIN;
 	tp->palm.vert_center = INT_MIN;
 
-	width = abs(device->abs.absinfo_x->maximum -
-		    device->abs.absinfo_x->minimum);
-	height = abs(device->abs.absinfo_y->maximum -
-		    device->abs.absinfo_y->minimum);
+	width = device->abs.dimensions.x;
+	height = device->abs.dimensions.y;
 
 	/* Wacom doesn't have internal touchpads,
 	 * Apple touchpads are always big enough to warrant palm detection */
@@ -1484,10 +1482,8 @@ tp_init(struct tp_dispatch *tp,
 	if (tp_init_slots(tp, device) != 0)
 		return -1;
 
-	width = abs(device->abs.absinfo_x->maximum -
-		    device->abs.absinfo_x->minimum);
-	height = abs(device->abs.absinfo_y->maximum -
-		     device->abs.absinfo_y->minimum);
+	width = device->abs.dimensions.x;
+	height = device->abs.dimensions.y;
 	diagonal = sqrt(width*width + height*height);
 
 	tp->reports_distance = libevdev_has_event_code(device->evdev,

src/evdev.c

@@ -1762,6 +1762,10 @@ evdev_configure_mt_device(struct evdev_device *device)
 
 	device->abs.absinfo_x = libevdev_get_abs_info(evdev, ABS_MT_POSITION_X);
 	device->abs.absinfo_y = libevdev_get_abs_info(evdev, ABS_MT_POSITION_Y);
+	device->abs.dimensions.x = abs(device->abs.absinfo_x->maximum -
+				       device->abs.absinfo_x->minimum);
+	device->abs.dimensions.y = abs(device->abs.absinfo_y->maximum -
+				       device->abs.absinfo_y->minimum);
 	device->is_mt = 1;
 
 	/* We only handle the slotted Protocol B in libinput.
@@ -1874,6 +1878,10 @@ evdev_configure_device(struct evdev_device *device)
 		device->abs.absinfo_y = libevdev_get_abs_info(evdev, ABS_Y);
 		device->abs.point.x = device->abs.absinfo_x->value;
 		device->abs.point.y = device->abs.absinfo_y->value;
+		device->abs.dimensions.x = abs(device->abs.absinfo_x->maximum -
+					       device->abs.absinfo_x->minimum);
+		device->abs.dimensions.y = abs(device->abs.absinfo_y->maximum -
+					       device->abs.absinfo_y->minimum);
 
 		if (evdev_is_fake_mt_device(device)) {
 			udev_tags &= ~EVDEV_UDEV_TAG_TOUCHSCREEN;

src/evdev.h

@@ -137,6 +137,8 @@ struct evdev_device {
 		struct matrix calibration;
 		struct matrix default_calibration; /* from LIBINPUT_CALIBRATION_MATRIX */
 		struct matrix usermatrix; /* as supplied by the caller */
+
+		struct device_coords dimensions;
 	} abs;
 
 	struct {