From 092f3a9b75b1fd465373730ca8d6038c89ed9220 Mon Sep 17 00:00:00 2001
From: Prabir Pradhan <prabirmsp@google.com>
Date: Thu, 25 Nov 2021 10:53:27 -0800
Subject: Add getSurfaceRotation API to MotionEvent

Add an API to get the current rotation value of the transform of the
MotionEvent.

Bug: 207771136
Test: atest MotionEventTest
Change-Id: I05fb4455d0dcfc0de8c8564473ee8d43ac86c0bd
---
 libs/input/Input.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'libs/input/Input.cpp')

diff --git a/libs/input/Input.cpp b/libs/input/Input.cpp
index cb93c92310..44487c3a85 100644
--- a/libs/input/Input.cpp
+++ b/libs/input/Input.cpp
@@ -24,6 +24,7 @@
 
 #include <android-base/stringprintf.h>
 #include <gui/constants.h>
+#include <input/DisplayViewport.h>
 #include <input/Input.h>
 #include <input/InputDevice.h>
 #include <input/InputEventLabels.h>
@@ -506,6 +507,24 @@ void MotionEvent::addSample(
     mSamplePointerCoords.appendArray(pointerCoords, getPointerCount());
 }
 
+int MotionEvent::getSurfaceRotation() const {
+    // The surface rotation is the rotation from the window's coordinate space to that of the
+    // display. Since the event's transform takes display space coordinates to window space, the
+    // returned surface rotation is the inverse of the rotation for the surface.
+    switch (mTransform.getOrientation()) {
+        case ui::Transform::ROT_0:
+            return DISPLAY_ORIENTATION_0;
+        case ui::Transform::ROT_90:
+            return DISPLAY_ORIENTATION_270;
+        case ui::Transform::ROT_180:
+            return DISPLAY_ORIENTATION_180;
+        case ui::Transform::ROT_270:
+            return DISPLAY_ORIENTATION_90;
+        default:
+            return -1;
+    }
+}
+
 float MotionEvent::getXCursorPosition() const {
     vec2 vals = mTransform.transform(getRawXCursorPosition(), getRawYCursorPosition());
     return vals.x;
-- 
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