From: Kristian Høgsberg <krh@bitplanet.net>
Date: Fri, 26 Jul 2013 17:41:43 +0000 (-0700)
Subject: evdev: Use temporary x and y coordinates when applying calibration
X-Git-Tag: 1.2.91~199
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=58014bbba84e207b9ca8afd98b20e3f1ffc06b33;p=platform%2Fupstream%2Fweston.git

evdev: Use temporary x and y coordinates when applying calibration

Don't overwrite device->abs.x halfway through the matrix multiplication.
---

diff --git a/src/evdev.c b/src/evdev.c
index a554302..dd3e2c9 100644
--- a/src/evdev.c
+++ b/src/evdev.c
@@ -230,16 +230,21 @@ is_motion_event(struct input_event *e)
 static void
 transform_absolute(struct evdev_device *device)
 {
+	int32_t x, y;
+
 	if (!device->abs.apply_calibration)
 		return;
 
-	device->abs.x = device->abs.x * device->abs.calibration[0] +
-			device->abs.y * device->abs.calibration[1] +
-			device->abs.calibration[2];
+	x = device->abs.x * device->abs.calibration[0] +
+		device->abs.y * device->abs.calibration[1] +
+		device->abs.calibration[2];
+
+	y = device->abs.x * device->abs.calibration[3] +
+		device->abs.y * device->abs.calibration[4] +
+		device->abs.calibration[5];
 
-	device->abs.y = device->abs.x * device->abs.calibration[3] +
-			device->abs.y * device->abs.calibration[4] +
-			device->abs.calibration[5];
+	device->abs.x = x;
+	device->abs.y = y;
 }
 
 static void