Scale touch event radius

ash/touch/touch_transformer_controller_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 "ash/touch/touch_transformer_controller.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/device_data_manager.h"
+#include "ui/events/test/events_test_utils_x11.h"
 #include "ui/gfx/display.h"
 
 namespace ash {
 
 namespace {
 DisplayInfo CreateDisplayInfo(int64 id,
                               int touch_device_id,
                               const gfx::Rect& bounds) {
   DisplayInfo info(id, std::string(), false);
   info.SetBounds(bounds);
@@ skipping 175 matching lines @@
   EXPECT_EQ(0, static_cast<int>(x));
   EXPECT_EQ(0, static_cast<int>(y));
 
   x = 2559.0;
   y = 2427.0;
   device_manager->ApplyTouchTransformer(6, &x, &y);
   EXPECT_EQ(2559, static_cast<int>(x));
   EXPECT_EQ(1599, static_cast<int>(y));
 }
 
+TEST_F(TouchTransformerControllerTest, TouchRadiusScale) {
+  DisplayInfo display = CreateDisplayInfo(1, 5, gfx::Rect(0, 0, 2560, 1600));
+  std::vector<unsigned int> devices;
+  devices.push_back(5);
+  ui::SetUpTouchDevicesForTest(devices);
+
+  TouchTransformerController* tt_controller =
+      Shell::GetInstance()->touch_transformer_controller();
+  // Default touchscreen position range is 1001x1001;
+  EXPECT_EQ(sqrt((2560.0 * 1600.0) / (1001.0 * 1001.0)),
+            tt_controller->GetTouchResolutionScale(display));
+}
+
 }  // namespace ash