Scale touch event radius

ui/events/device_data_manager.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 "ui/events/device_data_manager.h"
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/logging.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/geometry/point3_f.h"
 
 namespace ui {
 
 // static
 DeviceDataManager* DeviceDataManager::instance_ = NULL;
 
 DeviceDataManager::DeviceDataManager() {
   CHECK(!instance_) << "Can not create multiple instances of DeviceDataManager";
   instance_ = this;
 
   base::AtExitManager::RegisterTask(
       base::Bind(&base::DeletePointer<DeviceDataManager>, this));
 
-  for (int i = 0; i < kMaxDeviceNum; ++i)
+  for (int i = 0; i < kMaxDeviceNum; ++i) {
     touch_device_to_display_map_[i] = gfx::Display::kInvalidDisplayID;
+    touch_radius_scale_map_[i] = 1.0;
+  }
 }
 
 DeviceDataManager::~DeviceDataManager() {
   CHECK_EQ(this, instance_);
   instance_ = NULL;
 }
 
 // static
 DeviceDataManager* DeviceDataManager::instance() { return instance_; }
 
@@ skipping 13 matching lines @@
 
 // static
 bool DeviceDataManager::HasInstance() {
   return instance_ != NULL;
 }
 
 void DeviceDataManager::ClearTouchTransformerRecord() {
   for (int i = 0; i < kMaxDeviceNum; i++) {
     touch_device_transformer_map_[i] = gfx::Transform();
     touch_device_to_display_map_[i] = gfx::Display::kInvalidDisplayID;
+    touch_radius_scale_map_[i] = 1.0;
   }
 }
 
 bool DeviceDataManager::IsTouchDeviceIdValid(int touch_device_id) const {
   return (touch_device_id > 0 && touch_device_id < kMaxDeviceNum);
 }
 
 void DeviceDataManager::UpdateTouchInfoForDisplay(
     int64_t display_id,
     int touch_device_id,
     const gfx::Transform& touch_transformer) {
   if (IsTouchDeviceIdValid(touch_device_id)) {
     touch_device_to_display_map_[touch_device_id] = display_id;
     touch_device_transformer_map_[touch_device_id] = touch_transformer;
   }
 }
 
+void DeviceDataManager::UpdateTouchRadiusScale(int touch_device_id,
+                                               double scale) {
+  if (IsTouchDeviceIdValid(touch_device_id))
+    touch_radius_scale_map_[touch_device_id] = scale;
+}
+
+void DeviceDataManager::ApplyTouchRadiusScale(int touch_device_id,
+                                              double* radius) {
+  if (IsTouchDeviceIdValid(touch_device_id))
+    *radius = (*radius) * touch_radius_scale_map_[touch_device_id];
+}
+
 void DeviceDataManager::ApplyTouchTransformer(int touch_device_id,
                                               float* x,
                                               float* y) {
   if (IsTouchDeviceIdValid(touch_device_id)) {
     gfx::Point3F point(*x, *y, 0.0);
     const gfx::Transform& trans =
         touch_device_transformer_map_[touch_device_id];
     trans.TransformPoint(&point);
     *x = point.x();
     *y = point.y();
   }
 }
 
 int64_t DeviceDataManager::GetDisplayForTouchDevice(int touch_device_id) const {
   if (IsTouchDeviceIdValid(touch_device_id))
     return touch_device_to_display_map_[touch_device_id];
   return gfx::Display::kInvalidDisplayID;
 }
 
 }  // namespace ui