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display_list.cc
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display_list.cc
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// Copyright 2016 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/display/display_list.h"
#include "base/memory/ptr_util.h"
#include "ui/display/display_observer.h"
namespace display {
DisplayListObserverLock::~DisplayListObserverLock() {
display_list_->DecrementObserverSuspendLockCount();
}
DisplayListObserverLock::DisplayListObserverLock(DisplayList* display_list)
: display_list_(display_list) {
display_list_->IncrementObserverSuspendLockCount();
}
DisplayList::DisplayList() {}
DisplayList::~DisplayList() {
DCHECK_EQ(0, observer_suspend_lock_count_);
}
void DisplayList::AddObserver(DisplayObserver* observer) {
observers_.AddObserver(observer);
}
void DisplayList::RemoveObserver(DisplayObserver* observer) {
observers_.RemoveObserver(observer);
}
DisplayList::Displays::const_iterator DisplayList::FindDisplayById(
int64_t id) const {
for (auto iter = displays_.begin(); iter != displays_.end(); ++iter) {
if (iter->id() == id)
return iter;
}
return displays_.end();
}
DisplayList::Displays::const_iterator DisplayList::GetPrimaryDisplayIterator()
const {
return primary_display_index_ == -1
? displays_.end()
: displays_.begin() + primary_display_index_;
}
std::unique_ptr<DisplayListObserverLock> DisplayList::SuspendObserverUpdates() {
return base::WrapUnique(new DisplayListObserverLock(this));
}
void DisplayList::AddOrUpdateDisplay(const Display& display, Type type) {
if (FindDisplayById(display.id()) == displays_.end())
AddDisplay(display, type);
else
UpdateDisplay(display, type);
}
uint32_t DisplayList::UpdateDisplay(const Display& display) {
return UpdateDisplay(display, GetTypeByDisplayId(display.id()));
}
uint32_t DisplayList::UpdateDisplay(const Display& display, Type type) {
auto iter = FindDisplayByIdInternal(display.id());
DCHECK(iter != displays_.end());
Display* local_display = &(*iter);
uint32_t changed_values = 0;
if (type == Type::PRIMARY &&
static_cast<int>(iter - displays_.begin()) !=
static_cast<int>(GetPrimaryDisplayIterator() - displays_.begin())) {
primary_display_index_ = static_cast<int>(iter - displays_.begin());
// ash::DisplayManager only notifies for the Display gaining primary, not
// the one losing it.
changed_values |= DisplayObserver::DISPLAY_METRIC_PRIMARY;
}
if (local_display->bounds() != display.bounds()) {
local_display->set_bounds(display.bounds());
changed_values |= DisplayObserver::DISPLAY_METRIC_BOUNDS;
}
if (local_display->work_area() != display.work_area()) {
local_display->set_work_area(display.work_area());
changed_values |= DisplayObserver::DISPLAY_METRIC_WORK_AREA;
}
if (local_display->rotation() != display.rotation()) {
local_display->set_rotation(display.rotation());
changed_values |= DisplayObserver::DISPLAY_METRIC_ROTATION;
}
if (local_display->panel_rotation() != display.panel_rotation()) {
local_display->set_panel_rotation(display.panel_rotation());
changed_values |= DisplayObserver::DISPLAY_METRIC_ROTATION;
}
if (local_display->device_scale_factor() != display.device_scale_factor()) {
local_display->set_device_scale_factor(display.device_scale_factor());
changed_values |= DisplayObserver::DISPLAY_METRIC_DEVICE_SCALE_FACTOR;
}
if (local_display->color_spaces() != display.color_spaces() ||
local_display->depth_per_component() != display.depth_per_component() ||
local_display->color_depth() != display.color_depth()) {
local_display->set_color_spaces(display.color_spaces());
local_display->set_depth_per_component(display.depth_per_component());
local_display->set_color_depth(display.color_depth());
changed_values |= DisplayObserver::DISPLAY_METRIC_COLOR_SPACE;
}
if (local_display->GetSizeInPixel() != display.GetSizeInPixel()) {
local_display->set_size_in_pixels(display.GetSizeInPixel());
}
if (should_notify_observers()) {
for (DisplayObserver& observer : observers_)
observer.OnDisplayMetricsChanged(*local_display, changed_values);
}
return changed_values;
}
void DisplayList::AddDisplay(const Display& display, Type type) {
DCHECK(displays_.end() == FindDisplayByIdInternal(display.id()));
displays_.push_back(display);
if (type == Type::PRIMARY)
primary_display_index_ = static_cast<int>(displays_.size()) - 1;
if (should_notify_observers()) {
for (DisplayObserver& observer : observers_)
observer.OnDisplayAdded(display);
}
}
void DisplayList::RemoveDisplay(int64_t id) {
auto iter = FindDisplayByIdInternal(id);
DCHECK(displays_.end() != iter);
if (primary_display_index_ == static_cast<int>(iter - displays_.begin())) {
// The primary display can only be removed if it is the last display.
// Users must choose a new primary before removing an old primary display.
DCHECK_EQ(1u, displays_.size());
primary_display_index_ = -1;
} else if (primary_display_index_ >
static_cast<int>(iter - displays_.begin())) {
primary_display_index_--;
}
const Display display = *iter;
displays_.erase(iter);
if (should_notify_observers()) {
for (DisplayObserver& observer : observers_)
observer.OnDisplayRemoved(display);
}
}
void DisplayList::IncrementObserverSuspendLockCount() {
observer_suspend_lock_count_++;
}
void DisplayList::DecrementObserverSuspendLockCount() {
DCHECK_GT(observer_suspend_lock_count_, 0);
observer_suspend_lock_count_--;
}
DisplayList::Type DisplayList::GetTypeByDisplayId(int64_t display_id) const {
if (primary_display_index_ == -1)
return Type::NOT_PRIMARY;
return (displays_[primary_display_index_].id() == display_id
? Type::PRIMARY
: Type::NOT_PRIMARY);
}
DisplayList::Displays::iterator DisplayList::FindDisplayByIdInternal(
int64_t id) {
for (auto iter = displays_.begin(); iter != displays_.end(); ++iter) {
if (iter->id() == id)
return iter;
}
return displays_.end();
}
} // namespace display