Avoid heap allocations with GestureEventDataPacket

ui/events/gesture_detection/gesture_event_data_packet_unittest.cc

+// Copyright 2014 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 "base/basictypes.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/events/gesture_detection/gesture_event_data_packet.h"
+#include "ui/events/test/mock_motion_event.h"
+
+using ui::test::MockMotionEvent;
+
+namespace ui {
+namespace {
+
+const float kTouchX = 13.7f;
+const float kTouchY = 14.2f;
+
+GestureEventData CreateGesture(EventType type) {
+  return GestureEventData(GestureEventDetails(type, 0, 0),
+                          0,
+                          base::TimeTicks(),
+                          kTouchX,
+                          kTouchY,
+                          kTouchX + 5.f,
+                          kTouchY + 10.f,
+                          1,
+                          gfx::RectF(kTouchX - 1.f, kTouchY - 1.f, 2.f, 2.f));
+}
+
+}  // namespace
+
+bool GestureEquals(const GestureEventData& lhs, const GestureEventData& rhs) {
+  return lhs.type() == rhs.type() &&
+         lhs.motion_event_id == rhs.motion_event_id && lhs.time == rhs.time &&
+         lhs.x == rhs.x && lhs.y == rhs.y && lhs.raw_x == rhs.raw_x &&
+         lhs.raw_y == rhs.raw_y;
+}
+
+bool PacketEquals(const GestureEventDataPacket& lhs,
+                  const GestureEventDataPacket& rhs) {
+  if (lhs.timestamp() != rhs.timestamp() ||
+      lhs.gesture_count() != rhs.gesture_count() ||
+      lhs.timestamp() != rhs.timestamp() ||
+      lhs.gesture_source() != rhs.gesture_source() ||
+      lhs.touch_location() != rhs.touch_location() ||
+      lhs.raw_touch_location() != rhs.raw_touch_location())
+    return false;
+
+  for (size_t i = 0; i < lhs.gesture_count(); ++i) {
+    if (!GestureEquals(lhs.gesture(i), rhs.gesture(i)))
+      return false;
+  }
+
+  return true;
+}
+
+class GestureEventDataPacketTest : public testing::Test {};
+
+TEST_F(GestureEventDataPacketTest, Basic) {
+  base::TimeTicks touch_time = base::TimeTicks::Now();
+
+  GestureEventDataPacket packet;
+  EXPECT_EQ(0U, packet.gesture_count());
+  EXPECT_EQ(GestureEventDataPacket::UNDEFINED, packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_DOWN, touch_time, kTouchX, kTouchY));
+  EXPECT_TRUE(touch_time == packet.timestamp());
+  EXPECT_EQ(0U, packet.gesture_count());
+  EXPECT_EQ(gfx::PointF(kTouchX, kTouchY), packet.touch_location());
+
+  for (size_t i = ET_GESTURE_TYPE_START; i < ET_GESTURE_TYPE_END; ++i) {
+    const EventType type = static_cast<EventType>(i);
+    GestureEventData gesture = CreateGesture(type);
+    packet.Push(gesture);
+    const size_t index = (i - ET_GESTURE_TYPE_START);
+    ASSERT_EQ(index + 1U, packet.gesture_count());
+    EXPECT_TRUE(GestureEquals(gesture, packet.gesture(index)));
+  }
+}
+
+TEST_F(GestureEventDataPacketTest, Copy) {
+  GestureEventDataPacket packet0 = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_UP));
+  packet0.Push(CreateGesture(ET_GESTURE_TAP_DOWN));
+  packet0.Push(CreateGesture(ET_GESTURE_SCROLL_BEGIN));
+
+  GestureEventDataPacket packet1 = packet0;
+  EXPECT_TRUE(PacketEquals(packet0, packet1));
+
+  packet0 = packet1;
+  EXPECT_TRUE(PacketEquals(packet1, packet0));
+}
+
+TEST_F(GestureEventDataPacketTest, GestureSource) {
+  GestureEventDataPacket packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_DOWN));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_SEQUENCE_START,
+            packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_UP));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_SEQUENCE_END,
+            packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_CANCEL));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_SEQUENCE_CANCEL,
+            packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_MOVE));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_MOVE, packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_POINTER_DOWN));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_START, packet.gesture_source());
+
+  packet = GestureEventDataPacket::FromTouch(
+      MockMotionEvent(MotionEvent::ACTION_POINTER_UP));
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_END, packet.gesture_source());
+
+  GestureEventData gesture = CreateGesture(ET_GESTURE_TAP);
+  packet = GestureEventDataPacket::FromTouchTimeout(gesture);
+  EXPECT_EQ(GestureEventDataPacket::TOUCH_TIMEOUT, packet.gesture_source());
+  EXPECT_EQ(1U, packet.gesture_count());
+  EXPECT_EQ(base::TimeTicks(), packet.timestamp());
+  EXPECT_EQ(gfx::PointF(gesture.x, gesture.y), packet.touch_location());
+}
+
+}  // namespace ui