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..a361e0506064016e19b97795261e3e7392302228
--- /dev/null
+++ b/remoting/client/plugin/touch_input_scaler_unittest.cc
@@ -0,0 +1,291 @@
+// 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 "base/logging.h"
+#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 protocol::MockInputStub;
+using protocol::TouchEvent;
+using protocol::TouchEventPoint;
+
+namespace {
+
+const float kDefaultRadius = 30.0f;
+
+// If the rounding error for the coordinates checked in
+// TouchPointCoordinateEqual is within 1 pixel diff, it should be acceptable.
+const float kEpsilon = 1.0f;
+
+MATCHER_P(TouchPointCoordinateEqual,
+          expected_event,
+          "Expect point coordinates equal.") {
+  EXPECT_EQ(expected_event.touch_points().size(), arg.touch_points().size());
+  if (arg.touch_points().size() != expected_event.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);
+    EXPECT_NEAR(expected_point.x(), arg_point.x(), kEpsilon);
+    if (std::abs(expected_point.x() - arg_point.x()) >= kEpsilon)
+      return false;
+
+    EXPECT_NEAR(expected_point.y(), arg_point.y(), kEpsilon);
+    if (std::abs(expected_point.y() - arg_point.y()) >= kEpsilon)
+      return false;
+  }
+  return true;
+}
+
+struct Coordinate {
+  float x;
+  float y;
+};
+
+}  // namespace
+
+class TouchInputScalerTest : public ::testing::Test {
+ protected:
+  TouchInputScalerTest() : touch_input_scaler_(&mock_stub_) {}
+
+  void AddInputCoordinate(const Coordinate& coordinate) {
+    coordinates_.push_back(coordinate);
+  }
+
+  void AddDefaultTestCoordinate() {
+    coordinates_.push_back({1.0f, 1.0f});
+  }
+
+  void InjectTestTouchEvent() {
+    CHECK(!coordinates_.empty());
+    TouchEvent e;
+    e.set_event_type(TouchEvent::TOUCH_POINT_MOVE);
+
+    uint32_t id = 1;
+    for (const Coordinate& coordinate : coordinates_) {
+      TouchEventPoint* point = e.add_touch_points();
+      point->set_id(id++);
+      point->set_x(coordinate.x);
+      point->set_y(coordinate.y);
+      point->set_radius_x(kDefaultRadius);
+      point->set_radius_y(kDefaultRadius);
+    }
+
+    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<Coordinate> coordinates_;
+};
+
+// 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.
+TEST_F(TouchInputScalerTest, BothDimensionsZero) {
+  AddDefaultTestCoordinate();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, SetOnlyInputDimensions) {
+  SetInputDimensions(50, 60);
+  AddDefaultTestCoordinate();
+  EXPECT_CALL(mock_stub_, InjectTouchEvent(_)).Times(0);
+  InjectTestTouchEvent();
+}
+
+TEST_F(TouchInputScalerTest, SetOnlyOutputDimensions) {
+  SetOutputDimensions(50, 60);
+  AddDefaultTestCoordinate();
+  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});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(1.0f);
+
+  AddInputCoordinate({-2.0f, 1.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(1.0f);
+
+  AddInputCoordinate({-3.0f, -1.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(0.0f);
+
+  AddInputCoordinate({100.0f, 100.0f});
+  point = expected_out.add_touch_points();
+  // 1 less than max width and height.
+  point->set_x(49.0f);
+  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, i.e. no clamping testing.
+TEST_F(TouchInputScalerTest, UpScalingNoClamp) {
+  const int kInputDimension = 20;
+  const int kScalingFactor = 2;
+  SetInputDimensions(kInputDimension, kInputDimension);
+  SetOutputDimensions(kInputDimension * kScalingFactor,
+                      kInputDimension * kScalingFactor);
+
+  AddInputCoordinate({1.0f, 1.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(1.0f * kScalingFactor);
+  point->set_y(1.0f * kScalingFactor);
+
+  AddInputCoordinate({5.0f, 3.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(5.0f * kScalingFactor);
+  point->set_y(3.0f * kScalingFactor);
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify up scaling works.
+TEST_F(TouchInputScalerTest, UpScaling) {
+  const int kInputDimension = 20;
+  const int kScalingFactor = 2;
+  SetInputDimensions(kInputDimension, kInputDimension);
+  SetOutputDimensions(kInputDimension * kScalingFactor,
+                      kInputDimension * kScalingFactor);
+
+  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, i.e. no clamping testing.
+TEST_F(TouchInputScalerTest, DownScalingNoClamp) {
+  const int kOutputDimension = 20;
+  const int kDownScalingFactor = 2;
+  SetInputDimensions(kOutputDimension * kDownScalingFactor,
+                     kOutputDimension * kDownScalingFactor);
+  SetOutputDimensions(kOutputDimension, kOutputDimension);
+
+  AddInputCoordinate({2.0f, 2.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(2.0f / kDownScalingFactor);
+  point->set_y(2.0f / kDownScalingFactor);
+
+  AddInputCoordinate({6.0f, 3.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(6.0f / kDownScalingFactor);
+  point->set_y(3.0f / kDownScalingFactor);
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+// Verify down scaling works.
+TEST_F(TouchInputScalerTest, DownScaling) {
+  const int kOutputDimension = 20;
+  const int kDownScalingFactor = 2;
+  SetInputDimensions(kOutputDimension * kDownScalingFactor,
+                     kOutputDimension * kDownScalingFactor);
+  SetOutputDimensions(kOutputDimension, kOutputDimension);
+
+  AddInputCoordinate({-20.0f, 10.0f});
+  TouchEvent expected_out;
+  TouchEventPoint* point = expected_out.add_touch_points();
+  point->set_x(0.0f);
+  point->set_y(10.0f / kDownScalingFactor);
+
+  AddInputCoordinate({10.0f, -20.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(10.0f / kDownScalingFactor);
+  point->set_y(0.0f);
+
+  AddInputCoordinate({6.0f, 80.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(6.0f / kDownScalingFactor);
+  point->set_y(kOutputDimension - 1);
+
+  AddInputCoordinate({80.0f, 6.0f});
+  point = expected_out.add_touch_points();
+  point->set_x(kOutputDimension - 1);
+  point->set_y(6.0f / kDownScalingFactor);
+
+  EXPECT_CALL(mock_stub_,
+              InjectTouchEvent(TouchPointCoordinateEqual(expected_out)));
+  InjectTestTouchEvent();
+}
+
+}  // namespace remoting