Add a hidden API to apply a transform the content of an event.
Unlike normal transform, this actually transforms each
point directly. This is only useful for transforming
injected events.
Bug: 179274888
Test: atest libinput_tests:MotionEventTest
Change-Id: Ifbd90649156d2dd00087bf5a97a372ccaea3d5f3
diff --git a/libs/input/Input.cpp b/libs/input/Input.cpp
index deb4679..649a140 100644
--- a/libs/input/Input.cpp
+++ b/libs/input/Input.cpp
@@ -569,6 +569,24 @@
}
}
+void MotionEvent::applyTransform(const std::array<float, 9>& matrix) {
+ // Determine how the origin is transformed by the matrix so that we
+ // can transform orientation vectors.
+ vec2 origin = transformPoint(matrix, 0, 0);
+
+ // Apply the transformation to all samples.
+ size_t numSamples = mSamplePointerCoords.size();
+ for (size_t i = 0; i < numSamples; i++) {
+ PointerCoords& c = mSamplePointerCoords.editItemAt(i);
+ float orientation = c.getAxisValue(AMOTION_EVENT_AXIS_ORIENTATION);
+ c.setAxisValue(AMOTION_EVENT_AXIS_ORIENTATION,
+ transformAngle(matrix, orientation, origin.x, origin.y));
+ vec2 xy = transformPoint(matrix, c.getX(), c.getY());
+ c.setAxisValue(AMOTION_EVENT_AXIS_X, xy.x);
+ c.setAxisValue(AMOTION_EVENT_AXIS_Y, xy.y);
+ }
+}
+
#ifdef __linux__
static status_t readFromParcel(ui::Transform& transform, const Parcel& parcel) {
float dsdx, dtdx, tx, dtdy, dsdy, ty;