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;
diff --git a/libs/input/tests/InputEvent_test.cpp b/libs/input/tests/InputEvent_test.cpp
index 15ab428..32b72ba 100644
--- a/libs/input/tests/InputEvent_test.cpp
+++ b/libs/input/tests/InputEvent_test.cpp
@@ -636,28 +636,54 @@
ASSERT_NEAR(originalRawY, event.getRawY(0), 0.001);
}
-TEST_F(MotionEventTest, RawCompatTransform) {
- auto createTouchDownEvent = [](int x, int y, ui::Transform transform) {
- std::vector<PointerProperties> pointerProperties;
- pointerProperties.push_back(PointerProperties{/* id */ 0, AMOTION_EVENT_TOOL_TYPE_FINGER});
- std::vector<PointerCoords> pointerCoords;
- pointerCoords.emplace_back().clear();
- pointerCoords.back().setAxisValue(AMOTION_EVENT_AXIS_X, x);
- pointerCoords.back().setAxisValue(AMOTION_EVENT_AXIS_Y, y);
- nsecs_t eventTime = systemTime(SYSTEM_TIME_MONOTONIC);
- MotionEvent event;
- event.initialize(InputEvent::nextId(), /* deviceId */ 1, AINPUT_SOURCE_TOUCHSCREEN,
- /* displayId */ 0, INVALID_HMAC, AMOTION_EVENT_ACTION_DOWN,
- /* actionButton */ 0, /* flags */ 0, /* edgeFlags */ 0, AMETA_NONE,
- /* buttonState */ 0, MotionClassification::NONE, transform,
- /* xPrecision */ 0, /* yPrecision */ 0,
- AMOTION_EVENT_INVALID_CURSOR_POSITION,
- AMOTION_EVENT_INVALID_CURSOR_POSITION, /* displayWidth */ 400,
- /* displayHeight */ 800, eventTime, eventTime, pointerCoords.size(),
- pointerProperties.data(), pointerCoords.data());
- return event;
- };
+MotionEvent createTouchDownEvent(int x, int y, ui::Transform transform) {
+ std::vector<PointerProperties> pointerProperties;
+ pointerProperties.push_back(PointerProperties{/* id */ 0, AMOTION_EVENT_TOOL_TYPE_FINGER});
+ std::vector<PointerCoords> pointerCoords;
+ pointerCoords.emplace_back().clear();
+ pointerCoords.back().setAxisValue(AMOTION_EVENT_AXIS_X, x);
+ pointerCoords.back().setAxisValue(AMOTION_EVENT_AXIS_Y, y);
+ nsecs_t eventTime = systemTime(SYSTEM_TIME_MONOTONIC);
+ MotionEvent event;
+ event.initialize(InputEvent::nextId(), /* deviceId */ 1, AINPUT_SOURCE_TOUCHSCREEN,
+ /* displayId */ 0, INVALID_HMAC, AMOTION_EVENT_ACTION_DOWN,
+ /* actionButton */ 0, /* flags */ 0, /* edgeFlags */ 0, AMETA_NONE,
+ /* buttonState */ 0, MotionClassification::NONE, transform,
+ /* xPrecision */ 0, /* yPrecision */ 0, AMOTION_EVENT_INVALID_CURSOR_POSITION,
+ AMOTION_EVENT_INVALID_CURSOR_POSITION, /* displayWidth */ 400,
+ /* displayHeight */ 800, eventTime, eventTime, pointerCoords.size(),
+ pointerProperties.data(), pointerCoords.data());
+ return event;
+}
+TEST_F(MotionEventTest, ApplyTransform) {
+ // Create a rotate-90 transform with an offset (like a window which isn't fullscreen).
+ ui::Transform identity;
+ ui::Transform xform(ui::Transform::ROT_90, 800, 400);
+ xform.set(xform.tx() + 20, xform.ty() + 40);
+ MotionEvent event = createTouchDownEvent(60, 100, xform);
+ ASSERT_EQ(700, event.getRawX(0));
+ ASSERT_EQ(60, event.getRawY(0));
+ ASSERT_NE(event.getRawX(0), event.getX(0));
+ ASSERT_NE(event.getRawY(0), event.getY(0));
+
+ MotionEvent changedEvent = createTouchDownEvent(60, 100, identity);
+ const std::array<float, 9> rowMajor{xform[0][0], xform[1][0], xform[2][0],
+ xform[0][1], xform[1][1], xform[2][1],
+ xform[0][2], xform[1][2], xform[2][2]};
+ changedEvent.applyTransform(rowMajor);
+
+ // transformContent effectively rotates the raw coordinates, so those should now include
+ // both rotation AND offset
+ ASSERT_EQ(720, changedEvent.getRawX(0));
+ ASSERT_EQ(100, changedEvent.getRawY(0));
+
+ // The transformed output should be the same then
+ ASSERT_NEAR(event.getX(0), changedEvent.getX(0), 0.001);
+ ASSERT_NEAR(event.getY(0), changedEvent.getY(0), 0.001);
+}
+
+TEST_F(MotionEventTest, RawCompatTransform) {
{
// Make sure raw is raw regardless of transform translation.
ui::Transform xform;