1// Copyright (c) 2013 The Chromium Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "ash/display/event_transformation_handler.h" 6 7#include <cmath> 8 9#include "ash/screen_ash.h" 10#include "ash/shell.h" 11#include "ash/wm/coordinate_conversion.h" 12#include "ash/wm/window_util.h" 13#include "ui/aura/root_window.h" 14#include "ui/aura/window.h" 15#include "ui/base/events/event.h" 16#include "ui/compositor/dip_util.h" 17#include "ui/gfx/display.h" 18#include "ui/gfx/screen.h" 19 20#if defined(OS_CHROMEOS) 21#include "chromeos/display/output_configurator.h" 22#endif // defined(OS_CHROMEOS) 23 24namespace ash { 25namespace internal { 26namespace { 27 28// Boost factor for non-integrated displays. 29const float kBoostForNonIntegrated = 1.20f; 30} 31 32EventTransformationHandler::EventTransformationHandler() 33 : transformation_mode_(TRANSFORM_AUTO) { 34} 35 36EventTransformationHandler::~EventTransformationHandler() { 37} 38 39void EventTransformationHandler::OnScrollEvent(ui::ScrollEvent* event) { 40 if (transformation_mode_ == TRANSFORM_NONE) 41 return; 42 43 // Get the device scale factor and stack it on the final scale factor. 44 gfx::Point point_in_screen(event->location()); 45 aura::Window* target = static_cast<aura::Window*>(event->target()); 46 const float scale_at_target = ui::GetDeviceScaleFactor(target->layer()); 47 float scale = scale_at_target; 48 49 // Apply some additional scaling if the display is non-integrated. 50 wm::ConvertPointToScreen(target, &point_in_screen); 51 const gfx::Display& display = 52 Shell::GetScreen()->GetDisplayNearestPoint(point_in_screen); 53 if (!display.IsInternal()) 54 scale *= kBoostForNonIntegrated; 55 56 event->Scale(scale); 57} 58 59#if defined(OS_CHROMEOS) 60// This is to scale the TouchEvent's radius when the touch display is in 61// mirror mode. TouchEvent's radius is often reported in the touchscreen's 62// native resolution. In mirror mode, the touch display could be configured 63// at a lower resolution. We scale down the radius using the ratio defined as 64// the sqrt of 65// (mirror_width * mirror_height) / (native_width * native_height) 66void EventTransformationHandler::OnTouchEvent(ui::TouchEvent* event) { 67 using chromeos::OutputConfigurator; 68 OutputConfigurator* output_configurator = 69 ash::Shell::GetInstance()->output_configurator(); 70 71 // Check output_configurator's output_state instead of checking 72 // DisplayManager::IsMirrored() because the compositor based mirroring 73 // won't cause the scaling issue. 74 if (output_configurator->output_state() != chromeos::STATE_DUAL_MIRROR) 75 return; 76 77 const std::map<int, float>& area_ratio_map = 78 output_configurator->GetMirroredDisplayAreaRatioMap(); 79 80 // TODO(miletus): When there are more than 1 touchscreen (e.g. Link connected 81 // to an external touchscreen), the correct way to do is to have a way 82 // to find out which touchscreen is the event originating from and use the 83 // area ratio of that touchscreen to scale the event's radius. 84 // Tracked here crbug.com/233245 85 if (area_ratio_map.size() != 1) { 86 LOG(ERROR) << "Mirroring mode with " << area_ratio_map.size() 87 << " touch display found"; 88 return; 89 } 90 91 float area_ratio_sqrt = std::sqrt(area_ratio_map.begin()->second); 92 event->set_radius_x(event->radius_x() * area_ratio_sqrt); 93 event->set_radius_y(event->radius_y() * area_ratio_sqrt); 94} 95#endif // defined(OS_CHROMEOS) 96 97} // namespace internal 98} // namespace ash 99