Address comments from a previous change.

The original change is 00f511d329924824b1961e9472c3a06683fc2216.

Bug: 134788085
Test: atest libinput_tests
Change-Id: I1f3326067f94fe6a09850f4389483e60fa57a8d4

4 files changed, 12 insertions, 6 deletions

diff --git a/include/input/Input.h b/include/input/Input.h
index a97624658c..ad8c233577 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -24,6 +24,7 @@
  */
 
 #include <android/input.h>
+#include <math.h>
 #include <stdint.h>
 #include <utils/BitSet.h>
 #include <utils/KeyedVector.h>
@@ -476,6 +477,8 @@ public:
 
     float getYCursorPosition() const;
 
+    static inline bool isValidCursorPosition(float x, float y) { return !isnan(x) && !isnan(y); }
+
     inline nsecs_t getDownTime() const { return mDownTime; }
 
     inline void setDownTime(nsecs_t downTime) { mDownTime = downTime; }
diff --git a/libs/input/Input.cpp b/libs/input/Input.cpp
index 3266b0740d..dc4978b836 100644
--- a/libs/input/Input.cpp
+++ b/libs/input/Input.cpp
@@ -17,7 +17,6 @@
 #define LOG_TAG "Input"
 //#define LOG_NDEBUG 0
 
-#include <math.h>
 #include <limits.h>
 
 #include <input/Input.h>
@@ -434,7 +433,7 @@ void MotionEvent::transform(const float matrix[9]) {
     transformPoint(matrix, 0, 0, &originX, &originY);
 
     // Apply the transformation to cursor position.
-    if (!isnan(mXCursorPosition) && !isnan(mYCursorPosition)) {
+    if (isValidCursorPosition(mXCursorPosition, mYCursorPosition)) {
         float x = mXCursorPosition + oldXOffset;
         float y = mYCursorPosition + oldYOffset;
         transformPoint(matrix, x, y, &x, &y);
diff --git a/libs/input/tests/InputEvent_test.cpp b/libs/input/tests/InputEvent_test.cpp
index ec34f3e652..b879de6a74 100644
--- a/libs/input/tests/InputEvent_test.cpp
+++ b/libs/input/tests/InputEvent_test.cpp
@@ -603,9 +603,13 @@ TEST_F(MotionEventTest, Transform) {
         ASSERT_NEAR(tanf(angle), tanf(event.getOrientation(i)), 0.1);
     }
 
-    // Check cursor positions.
-    ASSERT_NEAR(sinf(PI_180 * (90 + ROTATION)) * RADIUS, event.getXCursorPosition(), 0.001);
-    ASSERT_NEAR(-cosf(PI_180 * (90 + ROTATION)) * RADIUS, event.getYCursorPosition(), 0.001);
+    // Check cursor positions. The original cursor position is at (3 + RADIUS, 2), where the center
+    // of the circle is (3, 2), so the cursor position is to the right of the center of the circle.
+    // The choice of triangular functions in this test defines the angle of rotation clockwise
+    // relative to the y-axis. Therefore the cursor position's angle is 90 degrees. Here we swap the
+    // triangular function so that we don't have to add the 90 degrees.
+    ASSERT_NEAR(cosf(PI_180 * ROTATION) * RADIUS, event.getXCursorPosition(), 0.001);
+    ASSERT_NEAR(sinf(PI_180 * ROTATION) * RADIUS, event.getYCursorPosition(), 0.001);
 
     // Applying the transformation should preserve the raw X and Y of the first point.
     ASSERT_NEAR(originalRawX, event.getRawX(0), 0.001);
diff --git a/services/inputflinger/InputDispatcher.cpp b/services/inputflinger/InputDispatcher.cpp
index be1370747c..1d8c365702 100644
--- a/services/inputflinger/InputDispatcher.cpp
+++ b/services/inputflinger/InputDispatcher.cpp
@@ -2766,7 +2766,7 @@ void InputDispatcher::notifyMotion(const NotifyMotionArgs* args) {
           ", policyFlags=0x%x, "
           "action=0x%x, actionButton=0x%x, flags=0x%x, metaState=0x%x, buttonState=0x%x, "
           "edgeFlags=0x%x, xPrecision=%f, yPrecision=%f, xCursorPosition=%f, "
-          "mYCursorPosition=%f, downTime=%" PRId64,
+          "yCursorPosition=%f, downTime=%" PRId64,
           args->eventTime, args->deviceId, args->source, args->displayId, args->policyFlags,
           args->action, args->actionButton, args->flags, args->metaState, args->buttonState,
           args->edgeFlags, args->xPrecision, args->yPrecision, arg->xCursorPosition,