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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 "chrome/browser/media/webrtc/desktop_media_list_base.h"
#include <set>
#include <utility>
#include "base/bind.h"
#include "base/task/post_task.h"
#include "chrome/browser/media/webrtc/desktop_media_list.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "ui/gfx/image/image.h"
using content::BrowserThread;
using content::DesktopMediaID;
DesktopMediaListBase::DesktopMediaListBase(base::TimeDelta update_period)
: update_period_(update_period) {}
DesktopMediaListBase::~DesktopMediaListBase() {}
void DesktopMediaListBase::SetUpdatePeriod(base::TimeDelta period) {
DCHECK(!observer_);
update_period_ = period;
}
void DesktopMediaListBase::SetThumbnailSize(const gfx::Size& thumbnail_size) {
thumbnail_size_ = thumbnail_size;
}
void DesktopMediaListBase::SetViewDialogWindowId(DesktopMediaID dialog_id) {
view_dialog_id_ = dialog_id;
}
void DesktopMediaListBase::StartUpdating(DesktopMediaListObserver* observer) {
DCHECK(!observer_);
observer_ = observer;
// Process sources previously discovered by a call to Update().
if (observer_) {
for (size_t i = 0; i < sources_.size(); i++) {
observer_->OnSourceAdded(this, i);
}
}
DCHECK(!refresh_callback_);
refresh_callback_ = base::BindOnce(&DesktopMediaListBase::ScheduleNextRefresh,
weak_factory_.GetWeakPtr());
Refresh(true);
}
void DesktopMediaListBase::Update(UpdateCallback callback) {
DCHECK(sources_.empty());
DCHECK(!refresh_callback_);
refresh_callback_ = std::move(callback);
Refresh(false);
}
int DesktopMediaListBase::GetSourceCount() const {
return sources_.size();
}
const DesktopMediaList::Source& DesktopMediaListBase::GetSource(
int index) const {
DCHECK_GE(index, 0);
DCHECK_LT(index, static_cast<int>(sources_.size()));
return sources_[index];
}
DesktopMediaID::Type DesktopMediaListBase::GetMediaListType() const {
return type_;
}
DesktopMediaListBase::SourceDescription::SourceDescription(
DesktopMediaID id,
const base::string16& name)
: id(id), name(name) {}
void DesktopMediaListBase::UpdateSourcesList(
const std::vector<SourceDescription>& new_sources) {
typedef std::set<DesktopMediaID> SourceSet;
SourceSet new_source_set;
for (size_t i = 0; i < new_sources.size(); ++i) {
new_source_set.insert(new_sources[i].id);
}
// Iterate through the old sources to find the removed sources.
for (size_t i = 0; i < sources_.size(); ++i) {
if (new_source_set.find(sources_[i].id) == new_source_set.end()) {
sources_.erase(sources_.begin() + i);
if (observer_)
observer_->OnSourceRemoved(this, i);
--i;
}
}
// Iterate through the new sources to find the added sources.
if (new_sources.size() > sources_.size()) {
SourceSet old_source_set;
for (size_t i = 0; i < sources_.size(); ++i) {
old_source_set.insert(sources_[i].id);
}
for (size_t i = 0; i < new_sources.size(); ++i) {
if (old_source_set.find(new_sources[i].id) == old_source_set.end()) {
sources_.insert(sources_.begin() + i, Source());
sources_[i].id = new_sources[i].id;
sources_[i].name = new_sources[i].name;
if (observer_)
observer_->OnSourceAdded(this, i);
}
}
}
DCHECK_EQ(new_sources.size(), sources_.size());
// Find the moved/changed sources.
size_t pos = 0;
while (pos < sources_.size()) {
if (!(sources_[pos].id == new_sources[pos].id)) {
// Find the source that should be moved to |pos|, starting from |pos + 1|
// of |sources_|, because entries before |pos| should have been sorted.
size_t old_pos = pos + 1;
for (; old_pos < sources_.size(); ++old_pos) {
if (sources_[old_pos].id == new_sources[pos].id)
break;
}
DCHECK(sources_[old_pos].id == new_sources[pos].id);
// Move the source from |old_pos| to |pos|.
Source temp = sources_[old_pos];
sources_.erase(sources_.begin() + old_pos);
sources_.insert(sources_.begin() + pos, temp);
if (observer_)
observer_->OnSourceMoved(this, old_pos, pos);
}
if (sources_[pos].name != new_sources[pos].name) {
sources_[pos].name = new_sources[pos].name;
if (observer_)
observer_->OnSourceNameChanged(this, pos);
}
++pos;
}
}
void DesktopMediaListBase::UpdateSourceThumbnail(DesktopMediaID id,
const gfx::ImageSkia& image) {
// Unlike other methods that check can_refresh(), this one won't cause
// OnRefreshComplete() to be called, but the caller is expected to schedule a
// call to OnRefreshComplete() after this method has been called as many times
// as needed, so the check is still valid.
DCHECK(can_refresh());
for (size_t i = 0; i < sources_.size(); ++i) {
if (sources_[i].id == id) {
sources_[i].thumbnail = image;
if (observer_)
observer_->OnSourceThumbnailChanged(this, i);
break;
}
}
}
// static
uint32_t DesktopMediaListBase::GetImageHash(const gfx::Image& image) {
SkBitmap bitmap = image.AsBitmap();
uint32_t value = base::Hash(bitmap.getPixels(), bitmap.computeByteSize());
return value;
}
void DesktopMediaListBase::OnRefreshComplete() {
DCHECK(refresh_callback_);
std::move(refresh_callback_).Run();
}
void DesktopMediaListBase::ScheduleNextRefresh() {
DCHECK(!refresh_callback_);
refresh_callback_ = base::BindOnce(&DesktopMediaListBase::ScheduleNextRefresh,
weak_factory_.GetWeakPtr());
base::PostDelayedTask(FROM_HERE, {BrowserThread::UI},
base::BindOnce(&DesktopMediaListBase::Refresh,
weak_factory_.GetWeakPtr(), true),
update_period_);
}
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