Merge "Don't rotate inputflinger's display" into sc-dev

1 files changed, 35 insertions, 0 deletions

diff --git a/core/java/android/view/MotionEvent.java b/core/java/android/view/MotionEvent.java
index 52b7cffbc340..d67439cc9de2 100644
--- a/core/java/android/view/MotionEvent.java
+++ b/core/java/android/view/MotionEvent.java
@@ -3768,6 +3768,41 @@ public final class MotionEvent extends InputEvent implements Parcelable {
         return (getButtonState() & button) == button;
     }
 
+    /**
+     * Gets a rotation matrix that (when applied to a motionevent) will rotate that motion event
+     * such that the result coordinates end up in the same physical location on a display whose
+     * coordinates are rotated by `rotation`.
+     *
+     * For example, rotating 0,0 by 90 degrees will move a point from the physical top-left to
+     * the bottom-left of the 90-degree-rotated display.
+     *
+     * @hide
+     */
+    public static Matrix createRotateMatrix(
+            @Surface.Rotation int rotation, int displayW, int displayH) {
+        if (rotation == Surface.ROTATION_0) {
+            return new Matrix(Matrix.IDENTITY_MATRIX);
+        }
+        // values is row-major
+        float[] values = null;
+        if (rotation == Surface.ROTATION_90) {
+            values = new float[]{0, 1, 0,
+                    -1, 0, displayH,
+                    0, 0, 1};
+        } else if (rotation == Surface.ROTATION_180) {
+            values = new float[]{-1, 0, displayW,
+                    0, -1, displayH,
+                    0, 0, 1};
+        } else if (rotation == Surface.ROTATION_270) {
+            values = new float[]{0, -1, displayW,
+                    1, 0, 0,
+                    0, 0, 1};
+        }
+        Matrix toOrient = new Matrix();
+        toOrient.setValues(values);
+        return toOrient;
+    }
+
     public static final @android.annotation.NonNull Parcelable.Creator<MotionEvent> CREATOR
             = new Parcelable.Creator<MotionEvent>() {
         public MotionEvent createFromParcel(Parcel in) {