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// 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/display/display_controller.h"
#include "ash/display/display_manager.h"
#include "ash/host/ash_window_tree_host.h"
#include "ash/root_window_controller.h"
#include "ash/shell.h"
#include "ui/aura/window_tree_host.h"
#include "ui/display/chromeos/display_configurator.h"
#include "ui/display/types/display_snapshot.h"
#include "ui/events/devices/device_data_manager.h"
namespace ash {
namespace {
DisplayManager* GetDisplayManager() {
return Shell::GetInstance()->display_manager();
}
ui::TouchscreenDevice FindTouchscreenById(unsigned int id) {
const std::vector<ui::TouchscreenDevice>& touchscreens =
ui::DeviceDataManager::GetInstance()->touchscreen_devices();
for (const auto& touchscreen : touchscreens) {
if (touchscreen.id == id)
return touchscreen;
}
return ui::TouchscreenDevice();
}
} // namespace
// This is to compute the scale ratio for the TouchEvent's radius. The
// configured resolution of the display is not always the same as the touch
// screen's reporting resolution, e.g. the display could be set as
// 1920x1080 while the touchscreen is reporting touch position range at
// 32767x32767. Touch radius is reported in the units the same as touch position
// so we need to scale the touch radius to be compatible with the display's
// resolution. We compute the scale as
// sqrt of (display_area / touchscreen_area)
double TouchTransformerController::GetTouchResolutionScale(
const DisplayInfo& touch_display,
const ui::TouchscreenDevice& touch_device) const {
if (touch_device.id == ui::InputDevice::kInvalidId ||
touch_device.size.IsEmpty() ||
touch_display.bounds_in_native().size().IsEmpty())
return 1.0;
double display_area = touch_display.bounds_in_native().size().GetArea();
double touch_area = touch_device.size.GetArea();
double ratio = std::sqrt(display_area / touch_area);
VLOG(2) << "Display size: "
<< touch_display.bounds_in_native().size().ToString()
<< ", Touchscreen size: " << touch_device.size.ToString()
<< ", Touch radius scale ratio: " << ratio;
return ratio;
}
gfx::Transform TouchTransformerController::GetTouchTransform(
const DisplayInfo& display,
const DisplayInfo& touch_display,
const ui::TouchscreenDevice& touchscreen,
const gfx::Size& framebuffer_size) const {
gfx::SizeF current_size = display.bounds_in_native().size();
gfx::SizeF touch_native_size = touch_display.GetNativeModeSize();
#if defined(USE_OZONE)
gfx::SizeF touch_area = touchscreen.size;
#elif defined(USE_X11)
// On X11 touches are reported in the framebuffer coordinate space.
gfx::SizeF touch_area = framebuffer_size;
#endif
gfx::Transform ctm;
if (current_size.IsEmpty() || touch_native_size.IsEmpty() ||
touch_area.IsEmpty() || touchscreen.id == ui::InputDevice::kInvalidId)
return ctm;
#if defined(USE_OZONE)
// Translate the touch so that it falls within the display bounds.
ctm.Translate(display.bounds_in_native().x(),
display.bounds_in_native().y());
#endif
// Take care of panel fitting only if supported. Panel fitting is emulated in
// software mirroring mode (display != touch_display).
// If panel fitting is enabled then the aspect ratio is preserved and the
// display is scaled acordingly. In this case blank regions would be present
// in order to center the displayed area.
if (display.is_aspect_preserving_scaling() ||
display.id() != touch_display.id()) {
float touch_native_ar =
touch_native_size.width() / touch_native_size.height();
float current_ar = current_size.width() / current_size.height();
if (current_ar > touch_native_ar) { // Letterboxing
ctm.Translate(
0, (1 - current_ar / touch_native_ar) * 0.5 * current_size.height());
ctm.Scale(1, current_ar / touch_native_ar);
} else if (touch_native_ar > current_ar) { // Pillarboxing
ctm.Translate(
(1 - touch_native_ar / current_ar) * 0.5 * current_size.width(), 0);
ctm.Scale(touch_native_ar / current_ar, 1);
}
}
// Take care of scaling between touchscreen area and display resolution.
ctm.Scale(current_size.width() / touch_area.width(),
current_size.height() / touch_area.height());
return ctm;
}
TouchTransformerController::TouchTransformerController() {
Shell::GetInstance()->display_controller()->AddObserver(this);
}
TouchTransformerController::~TouchTransformerController() {
Shell::GetInstance()->display_controller()->RemoveObserver(this);
}
void TouchTransformerController::UpdateTouchTransformer() const {
ui::DeviceDataManager* device_manager = ui::DeviceDataManager::GetInstance();
device_manager->ClearTouchDeviceAssociations();
// Display IDs and DisplayInfo for mirror or extended mode.
int64 display1_id = gfx::Display::kInvalidDisplayID;
int64 display2_id = gfx::Display::kInvalidDisplayID;
DisplayInfo display1;
DisplayInfo display2;
// Display ID and DisplayInfo for single display mode.
int64 single_display_id = gfx::Display::kInvalidDisplayID;
DisplayInfo single_display;
DisplayController* display_controller =
Shell::GetInstance()->display_controller();
DisplayManager* display_manager = GetDisplayManager();
if (display_manager->num_connected_displays() == 0) {
return;
} else if (display_manager->num_connected_displays() == 1) {
single_display_id = display_manager->first_display_id();
DCHECK(single_display_id != gfx::Display::kInvalidDisplayID);
single_display = display_manager->GetDisplayInfo(single_display_id);
device_manager->UpdateTouchRadiusScale(
single_display.touch_device_id(),
GetTouchResolutionScale(
single_display,
FindTouchscreenById(single_display.touch_device_id())));
} else {
DisplayIdPair id_pair = display_manager->GetCurrentDisplayIdPair();
display1_id = id_pair.first;
display2_id = id_pair.second;
DCHECK(display1_id != gfx::Display::kInvalidDisplayID &&
display2_id != gfx::Display::kInvalidDisplayID);
display1 = display_manager->GetDisplayInfo(display1_id);
display2 = display_manager->GetDisplayInfo(display2_id);
device_manager->UpdateTouchRadiusScale(
display1.touch_device_id(),
GetTouchResolutionScale(
display1,
FindTouchscreenById(display1.touch_device_id())));
device_manager->UpdateTouchRadiusScale(
display2.touch_device_id(),
GetTouchResolutionScale(
display2,
FindTouchscreenById(display2.touch_device_id())));
}
gfx::Size fb_size =
Shell::GetInstance()->display_configurator()->framebuffer_size();
if (display_manager->IsMirrored()) {
if (GetDisplayManager()->software_mirroring_enabled()) {
// In extended but software mirroring mode, there is a WindowTreeHost for
// each display, but all touches are forwarded to the primary root
// window's WindowTreeHost.
DisplayInfo target_display =
display_controller->GetPrimaryDisplayId() == display1_id ? display1
: display2;
device_manager->UpdateTouchInfoForDisplay(
target_display.id(), display1.touch_device_id(),
GetTouchTransform(target_display, display1,
FindTouchscreenById(display1.touch_device_id()),
fb_size));
device_manager->UpdateTouchInfoForDisplay(
target_display.id(), display2.touch_device_id(),
GetTouchTransform(target_display, display2,
FindTouchscreenById(display2.touch_device_id()),
fb_size));
} else {
// In mirror mode, there is just one WindowTreeHost and two displays. Make
// the WindowTreeHost accept touch events from both displays.
int64 primary_display_id = display_controller->GetPrimaryDisplayId();
device_manager->UpdateTouchInfoForDisplay(
primary_display_id, display1.touch_device_id(),
GetTouchTransform(display1, display1,
FindTouchscreenById(display1.touch_device_id()),
fb_size));
device_manager->UpdateTouchInfoForDisplay(
primary_display_id, display2.touch_device_id(),
GetTouchTransform(display2, display2,
FindTouchscreenById(display2.touch_device_id()),
fb_size));
}
return;
}
if (display_manager->num_connected_displays() > 1) {
// In actual extended mode, each display is associated with one
// WindowTreeHost.
device_manager->UpdateTouchInfoForDisplay(
display1_id, display1.touch_device_id(),
GetTouchTransform(display1, display1,
FindTouchscreenById(display1.touch_device_id()),
fb_size));
device_manager->UpdateTouchInfoForDisplay(
display2_id, display2.touch_device_id(),
GetTouchTransform(display2, display2,
FindTouchscreenById(display2.touch_device_id()),
fb_size));
return;
}
// Single display mode. The WindowTreeHost has one associated display id.
device_manager->UpdateTouchInfoForDisplay(
single_display_id, single_display.touch_device_id(),
GetTouchTransform(single_display, single_display,
FindTouchscreenById(single_display.touch_device_id()),
fb_size));
}
void TouchTransformerController::OnDisplaysInitialized() {
UpdateTouchTransformer();
}
void TouchTransformerController::OnDisplayConfigurationChanged() {
UpdateTouchTransformer();
}
} // namespace ash
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