Add touch events to the protocol, the stub layer, and to the client plugin.

remoting/client/plugin/touch_input_scaler_unittest.cc

Index: remoting/client/plugin/touch_input_scaler_unittest.cc
diff --git a/remoting/client/plugin/touch_input_scaler_unittest.cc b/remoting/client/plugin/touch_input_scaler_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ae36041dc6c4a9e2d2254490d9ad8062a087bef1
--- /dev/null
+++ b/remoting/client/plugin/touch_input_scaler_unittest.cc
@@ -0,0 +1,437 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/client/plugin/touch_input_scaler.h"
+
+#include <cmath>
+
+#include "remoting/protocol/protocol_mock_objects.h"
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+
+using ::testing::_;
+using ::testing::PrintToString;
+using protocol::MockInputStub;
+using protocol::TouchEvent;
+using protocol::TouchEventPoint;
+
+namespace {
+
+// If the rounding error for the coordinates checked in TouchPoint* matcher are
+// within 1 pixel diff, it should be acceptable.
+const float kEpsilon = 1.0f;
+
+void LogNumTouchPointMismatchError(int expected_size, int actual_size) {
+  DVLOG(1) << "Expected number of touch points (" << expected_size
+           << ") does not match the actual size (" << actual_size << ").";
+}
+
+void LogPointMismatchError(const std::string& field_name,
+                           int point_index,
+                           float expected,
+                           float actual) {
+  DVLOG(1) << "Point " << point_index << ": expected " << field_name
+           << " to be " << expected << ", actual " << actual
+           << " (not within rounding error grace " << kEpsilon << ").";
+}
+
+MATCHER_P(TouchPointCoordinateEqual,
+          expected_event,
+          "Expect point coordinates equal.") {
+  if (arg.touch_points().size() != expected_event.touch_points().size()) {
+    LogNumTouchPointMismatchError(expected_event.touch_points().size(),
+                                  arg.touch_points().size());
+    return false;
+  }
+
+  for (int i = 0; i < expected_event.touch_points().size(); ++i) {
+    const TouchEventPoint& arg_point = arg.touch_points(i);
+    const TouchEventPoint& expected_point = expected_event.touch_points(i);
+    if (std::abs(expected_point.x() - arg_point.x()) >= kEpsilon) {
+      LogPointMismatchError("X", i, expected_point.x(), arg_point.x());
+      return false;
+    }
+
+    if (std::abs(expected_point.y() - arg_point.y()) >= kEpsilon) {
+      LogPointMismatchError("Y", i, expected_point.y(), arg_point.y());
+      return false;
+    }
+  }
+  return true;
+}
+
+MATCHER_P(TouchPointRadiiEqual, expected_event, "Expected point radii equal.") {
+  if (arg.touch_points().size() != expected_event.touch_points().size()) {
+    LogNumTouchPointMismatchError(expected_event.touch_points().size(),
+                                  arg.touch_points().size());
+    return false;
+  }
+
+  for (int i = 0; i < expected_event.touch_points().size(); ++i) {
+    const TouchEventPoint& arg_point = arg.touch_points(i);
+    const TouchEventPoint& expected_point = expected_event.touch_points(i);
+    if (std::abs(expected_point.radius_x() - arg_point.radius_x()) >=
+        kEpsilon) {
+      LogPointMismatchError("radius X", i, expected_point.radius_x(),
+                            arg_point.radius_x());
+      return false;
+    }
+
+    if (std::abs(expected_point.radius_y() - arg_point.radius_y()) >=
+        kEpsilon) {
+      LogPointMismatchError("radius Y", i, expected_point.radius_y(),
+                            arg_point.radius_y());
+      return false;
+    }
+  }
+  return true;
+}
+
+const float kDefaultRadius = 30.0f;
+const float kDefaultXCoord = 1.0f;
+const float kDefaultYCoord = 1.0f;
+
+struct PointInfo {
+  PointInfo(float x, float y)
+      : PointInfo(x, y, kDefaultRadius, kDefaultRadius) {}
+  PointInfo(float x, float y, float radius_x, float radius_y)
+      : x(x), y(y), radius_x(radius_x), radius_y(radius_y) {}
+
+  float x;
+  float y;
+  float radius_x;
+  float radius_y;
+};
+
+const PointInfo kDefaultPointInfo = {kDefaultXCoord,
+                                     kDefaultYCoord,
+                                     kDefaultRadius,
+                                     kDefaultRadius};
+
+}  // namespace
+
+class TouchInputScalerTest : public ::testing::Test {
+ protected:
+  TouchInputScalerTest() : touch_input_scaler_(&mock_stub_) {}
+
+  void AddInputCoordinate(const PointInfo& point_info) {
+    point_infos_.push_back(point_info);
+  }
+
+  void AddDefaultTestPoint() { point_infos_.push_back(kDefaultPointInfo); }
+
+  void InjectTestTouchEvent() {
+    TouchEvent e;
+    e.set_event_type(TouchEvent::TOUCH_POINT_MOVE);
+
+    uint32_t id = 1;
+    for (const PointInfo& point_info : point_infos_) {
+      TouchEventPoint* point = e.add_touch_points();
+      point->set_id(id++);
+      point->set_x(point_info.x);
+      point->set_y(point_info.y);
+      point->set_radius_x(point_info.radius_x);
+      point->set_radius_y(point_info.radius_y);
+    }
+
+    touch_input_scaler_.InjectTouchEvent(e);
+  }
+
+  void SetInputDimensions(int width, int height) {
+    touch_input_scaler_.set_input_size(webrtc::DesktopSize(width, height));
+  }
+
+  void SetOutputDimensions(int width, int height) {
+    touch_input_scaler_.set_output_size(webrtc::DesktopSize(width, height));
+  }
+
+  MockInputStub mock_stub_;
+  TouchInputScaler touch_input_scaler_;
+
+ private:
+  std::vector<PointInfo> point_infos_;
+
+  DISALLOW_COPY_AND_ASSIGN(TouchInputScalerTest);
+};
+
+// TouchInputFilter require both input and output dimensions.
+// These test verify that no events are forwarded to the next InputStub if
+// either dimensions are not set or 0.
+TEST_F(TouchInputScalerTest, NoDimensionsSet) {
+  AddDefaultTestPoint();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, BothDimensionsZero) {
+  SetInputDimensions(0, 0);
+  SetOutputDimensions(0, 0);
+  AddDefaultTestPoint();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, SetOnlyInputDimensions) {
+  SetInputDimensions(50, 60);
+  AddDefaultTestPoint();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, SetOnlyOutputDimensions) {
+  SetOutputDimensions(50, 60);
+  AddDefaultTestPoint();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+// The x,y coordinate fall in the desktop size.
+TEST_F(TouchInputScalerTest, NoClampingNoScaling) {
+  SetInputDimensions(50, 60);
+  SetOutputDimensions(50, 60);
+
+  AddInputCoordinate({10.0f, 15.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(10.0f);
+  point->set_y(15.0f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Make sure clamping works.
+TEST_F(TouchInputScalerTest, ClampingNoScaling) {
+  SetInputDimensions(50, 60);
+  SetOutputDimensions(50, 60);
+
+  // Note that this could happen if touch started in the chromoting window but
+  // the finger moved off the windows.
+  AddInputCoordinate({-1.0f, 1.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(1.0f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, ClampingMultiplePointsNoScaling) {
+  SetInputDimensions(50, 60);
+  SetOutputDimensions(50, 60);
+
+  AddInputCoordinate({-1.0f, 1.0f});  // Fall off left.
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(1.0f);
+
+  AddInputCoordinate({100.0f, 1.0f});  // Fall off right.
+  point = expected_out.add_touch_points();
+  point->set_x(49.0f);
+  point->set_y(1.0f);
+
+  AddInputCoordinate({20.0f, 15.0f});  // Should not be clamped.
+  point = expected_out.add_touch_points();
+  point->set_x(20.0f);
+  point->set_y(15.0f);
+
+  AddInputCoordinate({3.0f, -1.0f});  // Fall off above.
+  point = expected_out.add_touch_points();
+  point->set_x(3.0f);
+  point->set_y(0.0f);
+
+  AddInputCoordinate({10.0f, 200.0f});  // Fall off below.
+  point = expected_out.add_touch_points();
+  point->set_x(10.0f);
+  point->set_y(59.0f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify up-scaling works. All coordinates should fall inside the output
+// dimensions after scaling.
+TEST_F(TouchInputScalerTest, UpScalingNoClamping) {
+  SetInputDimensions(20, 20);
+  SetOutputDimensions(40, 40);
+
+  AddInputCoordinate({1.0f, 1.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(2.0f);
+  point->set_y(2.0f);
+
+  AddInputCoordinate({1.2f, 4.2f});
+  point = expected_out.add_touch_points();
+  point->set_x(2.4f);
+  point->set_y(8.4f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify up-scaling works with clamping.
+TEST_F(TouchInputScalerTest, UpScalingWithClamping) {
+  SetInputDimensions(20, 20);
+  SetOutputDimensions(40, 40);
+
+  AddInputCoordinate({25.0f, 25.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(39.0f);
+  point->set_y(39.0f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify down scaling works. All coordinates should fall inside the output
+// dimensions after scaling.
+TEST_F(TouchInputScalerTest, DownScalingNoClamping) {
+  SetInputDimensions(40, 40);
+  SetOutputDimensions(20, 20);
+
+  AddInputCoordinate({2.0f, 2.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(1.0f);
+  point->set_y(1.0f);
+
+  AddInputCoordinate({6.0f, 3.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(3.0);
+  point->set_y(1.5f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify down scaling works with clamping.
+TEST_F(TouchInputScalerTest, DownScalingWithClamping) {
+  SetInputDimensions(40, 40);
+  SetOutputDimensions(20, 20);
+
+  AddInputCoordinate({-20.0f, 10.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(5.0f);
+
+  AddInputCoordinate({10.0f, -20.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(5.0f);
+  point->set_y(0.0f);
+
+  AddInputCoordinate({6.0f, 80.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(3.0f);
+  point->set_y(19.0f);
+
+  AddInputCoordinate({80.0f, 6.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(19.0f);
+  point->set_y(3.0f);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify that the radii are up-scaled.
+TEST_F(TouchInputScalerTest, UpScaleRadii) {
+  SetInputDimensions(20, 20);
+  SetOutputDimensions(40, 40);
+
+  AddInputCoordinate({0.0f, 0.0f, 1.0f, 2.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_radius_x(2.0f);
+  point->set_radius_y(4.0f);
+
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(TouchPointRadiiEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify that the radii are down-scaled.
+TEST_F(TouchInputScalerTest, DownScaleRadii) {
+  SetInputDimensions(20, 20);
+  SetOutputDimensions(10, 10);
+
+  AddInputCoordinate({0.0f, 0.0f, 5.0f, 4.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_radius_x(2.5f);
+  point->set_radius_y(2.0f);
+
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(TouchPointRadiiEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify that up-scaling with clamping works for x,y coordinates and radii all
+// work together.
+TEST_F(TouchInputScalerTest, UpScaleCoordinatesAndRadii) {
+  SetInputDimensions(20, 20);
+  SetOutputDimensions(40, 40);
+
+  AddInputCoordinate({5.0f, 12.0f, 3.0f, 2.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(10.0f);
+  point->set_y(24.0f);
+  point->set_radius_x(6.0f);
+  point->set_radius_y(4.0f);
+
+  // Make sure clamping and scaling all work.
+  AddInputCoordinate({22.0f, -1.0f, 8.0f, 3.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(39.0f);
+  point->set_y(0.0f);
+  point->set_radius_x(16.0f);
+  point->set_radius_y(6.0f);
+
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(::testing::AllOf(
+                              TouchPointCoordinateEqual(expected_out),
+                              TouchPointRadiiEqual(expected_out))));
+  InjectTestTouchEvent();
+}
+
+// Verify that down-scaling with clamping works for x,y coordinates and radii
+// all work together.
+TEST_F(TouchInputScalerTest, DownScaleCoordinatesAndRadii) {
+  SetInputDimensions(60, 60);
+  SetOutputDimensions(20, 20);
+
+  AddInputCoordinate({50.0f, 24.0f, 10.0f, 9.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(16.666f);
+  point->set_y(8.0f);
+  point->set_radius_x(3.333f);
+  point->set_radius_y(3.0f);
+
+  // Make sure clamping and scaling all work.
+  AddInputCoordinate({70.0f, 82.0f, 8.0f, 3.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(19.0f);
+  point->set_y(19.0f);
+  point->set_radius_x(2.666f);
+  point->set_radius_y(1.0f);
+
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(::testing::AllOf(
+                              TouchPointCoordinateEqual(expected_out),
+                              TouchPointRadiiEqual(expected_out))));
+  InjectTestTouchEvent();
+}
+
+}  // namespace remoting