WIP handle touch events on server

server/src/main/java/com/genymobile/scrcpy/Controller.java

@@ -13,6 +13,8 @@ import java.io.IOException;
 
 public class Controller {
 
+    private static final int MAX_FINGERS = 10;
+
     private final Device device;
     private final DesktopConnection connection;
     private final DeviceMessageSender sender;
@@ -23,10 +25,16 @@ public class Controller {
     private final MotionEvent.PointerProperties[] mousePointerProperties = {new MotionEvent.PointerProperties()};
     private final MotionEvent.PointerCoords[] mousePointerCoords = {new MotionEvent.PointerCoords()};
 
+    private long lastTouchDown;
+    private final FingersState fingersState = new FingersState(MAX_FINGERS);
+    private final MotionEvent.PointerProperties[] touchPointerProperties = new MotionEvent.PointerProperties[MAX_FINGERS];
+    private final MotionEvent.PointerCoords[] touchPointerCoords = new MotionEvent.PointerCoords[MAX_FINGERS];
+
     public Controller(Device device, DesktopConnection connection) {
         this.device = device;
         this.connection = connection;
         initMousePointer();
+        initTouchPointers();
         sender = new DeviceMessageSender(connection);
     }
 
@@ -41,6 +49,17 @@ public class Controller {
         coords.size = 1;
     }
 
+    private void initTouchPointers() {
+        for (int i = 0; i < MAX_FINGERS; ++i) {
+            MotionEvent.PointerProperties props = new MotionEvent.PointerProperties();
+            props.toolType = MotionEvent.TOOL_TYPE_FINGER;
+
+            MotionEvent.PointerCoords coords = new MotionEvent.PointerCoords();
+            coords.orientation = 0;
+            coords.size = 1;
+        }
+    }
+
     private void setMousePointerCoords(Point point) {
         MotionEvent.PointerCoords coords = mousePointerCoords[0];
         coords.x = point.getX();
@@ -164,6 +183,34 @@ public class Controller {
         return injectEvent(event);
     }
 
+    private boolean injectTouch(int action, int fingerId, Position position, float pressure) {
+        long now = SystemClock.uptimeMillis();
+        if (action == MotionEvent.ACTION_DOWN) {
+            lastTouchDown = now;
+        }
+        Point point = device.getPhysicalPoint(position);
+        if (point == null) {
+            // ignore event
+            return false;
+        }
+        if (action == MotionEvent.ACTION_UP) {
+            if (!fingersState.unset(fingerId)) {
+                Ln.w("Unexpected ACTION_UP on unknown finger");
+                return false;
+            }
+        } else {
+            // ACTION_DOWN or ACTION_MOVE
+            if (!fingersState.set(fingerId, point, pressure)) {
+                Ln.w("Too many fingers for touch event");
+                return false;
+            }
+        }
+        int pointerCount = fingersState.update(touchPointerProperties, touchPointerCoords);
+        MotionEvent event = MotionEvent.obtain(lastTouchDown, now, action, pointerCount, touchPointerProperties, touchPointerCoords, 0, 0, 1f, 1f, 0, 0,
+                InputDevice.SOURCE_TOUCHSCREEN, 0);
+        return injectEvent(event);
+    }
+
     private boolean injectScroll(Position position, int hScroll, int vScroll) {
         long now = SystemClock.uptimeMillis();
         Point point = device.getPhysicalPoint(position);

server/src/main/java/com/genymobile/scrcpy/Finger.java

@@ -0,0 +1,32 @@
+package com.genymobile.scrcpy;
+
+public class Finger {
+
+    private final long id;
+    private Point point;
+    private float pressure;
+
+    public Finger(long id) {
+        this.id = id;
+    }
+
+    public long getId() {
+        return id;
+    }
+
+    public Point getPoint() {
+        return point;
+    }
+
+    public void setPoint(Point point) {
+        this.point = point;
+    }
+
+    public float getPressure() {
+        return pressure;
+    }
+
+    public void setPressure(float pressure) {
+        this.pressure = pressure;
+    }
+}

server/src/main/java/com/genymobile/scrcpy/FingersState.java

@@ -0,0 +1,99 @@
+package com.genymobile.scrcpy;
+
+import android.view.MotionEvent;
+
+public class FingersState {
+
+    /**
+     * Array of enabled fingers (can contain "null" holes).
+     * <p>
+     * Once a Finger (identified by its id received from the client) is enabled, it is never moved.
+     * <p>
+     * Its index is its local identifier injected into MotionEvents.
+     */
+    private final Finger[] fingers;
+
+    public FingersState(int maxFingers) {
+        fingers = new Finger[maxFingers];
+    }
+
+    private int indexOf(long id) {
+        for (int i = 0; i < fingers.length; ++i) {
+            Finger finger = fingers[i];
+            if (finger != null && finger.getId() == id) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private int indexOfFirstEmpty() {
+        for (int i = 0; i < fingers.length; ++i) {
+            if (fingers[i] == null) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private Finger create(long id) {
+        int index = indexOf(id);
+        if (index != -1) {
+            // already exists, return it
+            return fingers[index];
+        }
+        int firstEmpty = indexOfFirstEmpty();
+        if (firstEmpty == -1) {
+            // it's full
+            return null;
+        }
+        Finger finger = new Finger(id);
+        fingers[firstEmpty] = finger;
+        return finger;
+    }
+
+    public boolean unset(int id) {
+        int index = indexOf(id);
+        if (index == -1) {
+            return false;
+        }
+        fingers[index] = null;
+        return true;
+    }
+
+    public boolean set(int id, Point point, float pressure) {
+        Finger finger = create(id);
+        if (finger == null) {
+            return false;
+        }
+        finger.setPoint(point);
+        finger.setPressure(pressure);
+        return true;
+    }
+
+    /**
+     * Initialize the motion event parameters.
+     *
+     * @param props  the pointer properties
+     * @param coords the pointer coordinates
+     * @return The number of items initialized (the number of fingers).
+     */
+    public int update(MotionEvent.PointerProperties[] props, MotionEvent.PointerCoords[] coords) {
+        int count = 0;
+        for (int i = 0; i < fingers.length; ++i) {
+            Finger finger = fingers[i];
+            if (finger != null) {
+                // id 0 is reserved for mouse events
+                props[count].id = i + 1;
+
+                Point point = finger.getPoint();
+                coords[i].x = point.getX();
+                coords[i].y = point.getY();
+                coords[i].pressure = finger.getPressure();
+
+                ++count;
+            }
+        }
+        return count;
+    }
+}