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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/device_data_manager.h"
#include "ui/events/x/device_data_manager_x11.h"
namespace ash {
namespace {
DisplayManager* GetDisplayManager() {
return Shell::GetInstance()->display_manager();
}
} // 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 {
if (touch_display.touch_device_id() == 0u)
return 1.0;
double min_x, max_x;
double min_y, max_y;
if (!ui::DeviceDataManagerX11::GetInstance()->GetDataRange(
touch_display.touch_device_id(),
ui::DeviceDataManagerX11::DT_TOUCH_POSITION_X,
&min_x, &max_x) ||
!ui::DeviceDataManagerX11::GetInstance()->GetDataRange(
touch_display.touch_device_id(),
ui::DeviceDataManagerX11::DT_TOUCH_POSITION_Y,
&min_y, &max_y)) {
return 1.0;
}
double width = touch_display.bounds_in_native().width();
double height = touch_display.bounds_in_native().height();
if (max_x == 0.0 || max_y == 0.0 || width == 0.0 || height == 0.0)
return 1.0;
// [0, max_x] -> touchscreen width = max_x + 1
// [0, max_y] -> touchscreen height = max_y + 1
max_x += 1.0;
max_y += 1.0;
double ratio = std::sqrt((width * height) / (max_x * max_y));
VLOG(2) << "Screen width/height: " << width << "/" << height
<< ", Touchscreen width/height: " << max_x << "/" << max_y
<< ", Touch radius scale ratio: " << ratio;
return ratio;
}
// This function computes the extended mode TouchTransformer for
// |touch_display|. The TouchTransformer maps the touch event position
// from framebuffer size to the display size.
gfx::Transform
TouchTransformerController::GetExtendedModeTouchTransformer(
const DisplayInfo& touch_display, const gfx::Size& fb_size) const {
gfx::Transform ctm;
if (touch_display.touch_device_id() == 0u || fb_size.width() == 0.0 ||
fb_size.height() == 0.0)
return ctm;
float width = touch_display.bounds_in_native().width();
float height = touch_display.bounds_in_native().height();
ctm.Scale(width / fb_size.width(), height / fb_size.height());
return ctm;
}
bool TouchTransformerController::ShouldComputeMirrorModeTouchTransformer(
const DisplayInfo& touch_display) const {
if (force_compute_mirror_mode_touch_transformer_)
return true;
if (touch_display.touch_device_id() == 0u)
return false;
if (touch_display.size_in_pixel() == touch_display.GetNativeModeSize() ||
!touch_display.is_aspect_preserving_scaling()) {
return false;
}
return true;
}
// This function computes the mirror mode TouchTransformer for |touch_display|.
// When internal monitor is applied a resolution that does not have
// the same aspect ratio as its native resolution, there would be
// blank regions in the letterboxing/pillarboxing mode.
// The TouchTransformer will make sure the touch events on the blank region
// have negative coordinates and touch events within the chrome region
// have the correct positive coordinates.
gfx::Transform TouchTransformerController::GetMirrorModeTouchTransformer(
const DisplayInfo& touch_display) const {
gfx::Transform ctm;
if (!ShouldComputeMirrorModeTouchTransformer(touch_display))
return ctm;
float mirror_width = touch_display.bounds_in_native().width();
float mirror_height = touch_display.bounds_in_native().height();
gfx::Size native_mode_size = touch_display.GetNativeModeSize();
float native_width = native_mode_size.width();
float native_height = native_mode_size.height();
if (native_height == 0.0 || mirror_height == 0.0 ||
native_width == 0.0 || mirror_width == 0.0)
return ctm;
float native_ar = native_width / native_height;
float mirror_ar = mirror_width / mirror_height;
if (mirror_ar > native_ar) { // Letterboxing
// Translate before scale.
ctm.Translate(0.0, (1.0 - mirror_ar / native_ar) * 0.5 * mirror_height);
ctm.Scale(1.0, mirror_ar / native_ar);
return ctm;
}
if (native_ar > mirror_ar) { // Pillarboxing
// Translate before scale.
ctm.Translate((1.0 - native_ar / mirror_ar) * 0.5 * mirror_width, 0.0);
ctm.Scale(native_ar / mirror_ar, 1.0);
return ctm;
}
return ctm; // Same aspect ratio - return identity
}
TouchTransformerController::TouchTransformerController() :
force_compute_mirror_mode_touch_transformer_ (false) {
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->ClearTouchTransformerRecord();
// 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();
ui::MultipleDisplayState display_state =
Shell::GetInstance()->display_configurator()->display_state();
if (display_state == ui::MULTIPLE_DISPLAY_STATE_INVALID ||
display_state == ui::MULTIPLE_DISPLAY_STATE_HEADLESS) {
return;
} else if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR ||
display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED) {
DisplayIdPair id_pair = GetDisplayManager()->GetCurrentDisplayIdPair();
display1_id = id_pair.first;
display2_id = id_pair.second;
DCHECK(display1_id != gfx::Display::kInvalidDisplayID &&
display2_id != gfx::Display::kInvalidDisplayID);
display1 = GetDisplayManager()->GetDisplayInfo(display1_id);
display2 = GetDisplayManager()->GetDisplayInfo(display2_id);
device_manager->UpdateTouchRadiusScale(display1.touch_device_id(),
GetTouchResolutionScale(display1));
device_manager->UpdateTouchRadiusScale(display2.touch_device_id(),
GetTouchResolutionScale(display2));
} else {
single_display_id = GetDisplayManager()->first_display_id();
DCHECK(single_display_id != gfx::Display::kInvalidDisplayID);
single_display = GetDisplayManager()->GetDisplayInfo(single_display_id);
device_manager->UpdateTouchRadiusScale(
single_display.touch_device_id(),
GetTouchResolutionScale(single_display));
}
if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_MIRROR) {
// In mirror mode, both displays share the same root window so
// both display ids are associated with the root window.
aura::Window* root = display_controller->GetPrimaryRootWindow();
RootWindowController::ForWindow(root)->ash_host()->UpdateDisplayID(
display1_id, display2_id);
device_manager->UpdateTouchInfoForDisplay(
display1_id,
display1.touch_device_id(),
GetMirrorModeTouchTransformer(display1));
device_manager->UpdateTouchInfoForDisplay(
display2_id,
display2.touch_device_id(),
GetMirrorModeTouchTransformer(display2));
return;
}
if (display_state == ui::MULTIPLE_DISPLAY_STATE_DUAL_EXTENDED) {
gfx::Size fb_size =
Shell::GetInstance()->display_configurator()->framebuffer_size();
// In extended but software mirroring mode, ther is only one X root window
// that associates with both displays.
if (GetDisplayManager()->software_mirroring_enabled()) {
aura::Window* root = display_controller->GetPrimaryRootWindow();
RootWindowController::ForWindow(root)->ash_host()->UpdateDisplayID(
display1_id, display2_id);
DisplayInfo source_display =
gfx::Display::InternalDisplayId() == display1_id ?
display1 : display2;
// Mapping from framebuffer size to the source display's native
// resolution.
device_manager->UpdateTouchInfoForDisplay(
display1_id,
display1.touch_device_id(),
GetExtendedModeTouchTransformer(source_display, fb_size));
device_manager->UpdateTouchInfoForDisplay(
display2_id,
display2.touch_device_id(),
GetExtendedModeTouchTransformer(source_display, fb_size));
} else {
// In actual extended mode, each display is associated with one root
// window.
aura::Window* root1 =
display_controller->GetRootWindowForDisplayId(display1_id);
aura::Window* root2 =
display_controller->GetRootWindowForDisplayId(display2_id);
RootWindowController::ForWindow(root1)->ash_host()->UpdateDisplayID(
display1_id, gfx::Display::kInvalidDisplayID);
RootWindowController::ForWindow(root2)->ash_host()->UpdateDisplayID(
display2_id, gfx::Display::kInvalidDisplayID);
// Mapping from framebuffer size to each display's native resolution.
device_manager->UpdateTouchInfoForDisplay(
display1_id,
display1.touch_device_id(),
GetExtendedModeTouchTransformer(display1, fb_size));
device_manager->UpdateTouchInfoForDisplay(
display2_id,
display2.touch_device_id(),
GetExtendedModeTouchTransformer(display2, fb_size));
}
return;
}
// Single display mode. The root window has one associated display id.
aura::Window* root =
display_controller->GetRootWindowForDisplayId(single_display.id());
RootWindowController::ForWindow(root)->ash_host()->UpdateDisplayID(
single_display.id(), gfx::Display::kInvalidDisplayID);
device_manager->UpdateTouchInfoForDisplay(single_display_id,
single_display.touch_device_id(),
gfx::Transform());
}
void TouchTransformerController::OnDisplaysInitialized() {
UpdateTouchTransformer();
}
void TouchTransformerController::OnDisplayConfigurationChanged() {
UpdateTouchTransformer();
}
} // namespace ash
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