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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/chromeos/display_snapshot.h"
#include "ui/events/device_data_manager.h"
namespace ash {
namespace {
DisplayManager* GetDisplayManager() {
return Shell::GetInstance()->display_manager();
}
} // namespace
// 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() == 0 ||
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() == 0)
return false;
const ui::DisplayConfigurator::DisplayState* state = NULL;
const std::vector<ui::DisplayConfigurator::DisplayState>& cached_displays =
Shell::GetInstance()->display_configurator()->cached_displays();
for (size_t i = 0; i < cached_displays.size(); i++) {
if (cached_displays[i].touch_device_id == touch_display.touch_device_id()) {
state = &cached_displays[i];
break;
}
}
if (!state || state->mirror_mode == state->display->native_mode() ||
!state->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();
float native_width = 0;
float native_height = 0;
std::vector<DisplayMode> modes = touch_display.display_modes();
for (size_t i = 0; i < modes.size(); i++) {
if (modes[i].native) {
native_width = modes[i].size.width();
native_height = modes[i].size.height();
break;
}
}
if (native_height == 0.0 || mirror_height == 0.0 ||
native_width == 0.0 || mirror_width == 0.0)
return ctm;
float native_ar = static_cast<float>(native_width) /
static_cast<float>(native_height);
float mirror_ar = static_cast<float>(mirror_width) /
static_cast<float>(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) {
// TODO(miletus) : Handle DUAL_EXTENDED with software mirroring.
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);
} else {
single_display_id = GetDisplayManager()->first_display_id();
DCHECK(single_display_id != gfx::Display::kInvalidDisplayID);
single_display = GetDisplayManager()->GetDisplayInfo(single_display_id);
}
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) {
// TODO(miletus) : Handle the case the state is DUAL_EXTENDED but it
// is actually doing software mirroring.
if (GetDisplayManager()->software_mirroring_enabled())
return;
// In 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);
gfx::Size fb_size =
Shell::GetInstance()->display_configurator()->framebuffer_size();
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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