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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant reason:default
#include "compositor.h"
#include "base/memory/ref_counted.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include <QGuiApplication>
#include <QHash>
#include <QReadWriteLock>
#include <QQuickWindow>
#include <QWaitCondition>
namespace QtWebEngineCore {
Q_LOGGING_CATEGORY(lcWebEngineCompositor, "qt.webengine.compositor");
// Compositor::Id
Compositor::Id::Id(viz::FrameSinkId fid) : client_id(fid.client_id()), sink_id(fid.sink_id()) { }
static size_t qHash(Compositor::Id id, size_t seed = 0)
{
QtPrivate::QHashCombine hasher;
seed = hasher(seed, id.client_id);
seed = hasher(seed, id.sink_id);
return seed;
}
static bool operator==(Compositor::Id id1, Compositor::Id id2)
{
return id1.client_id == id2.client_id && id1.sink_id == id2.sink_id;
}
// Compositor::Binding and Compositor::Bindings
struct Compositor::Binding
{
const Id id;
Compositor *compositor = nullptr;
Observer *observer = nullptr;
QWaitCondition condition;
bool waitForRelease = false;
Binding(Id id) : id(id) { }
~Binding();
};
class Compositor::BindingMap
{
public:
void lock() { m_mutex.lockForRead(); }
void lockForWrite() { m_mutex.lockForWrite(); }
void unlock() { m_mutex.unlock(); }
Binding *findOrCreate(Id id)
{
auto it = m_map.find(id);
if (it == m_map.end())
it = m_map.insert(id, new Binding(id));
return *it;
}
void remove(Id id) { m_map.remove(id); }
private:
QReadWriteLock m_mutex;
QHash<Id, Binding *> m_map;
friend class Compositor;
} static g_bindings;
Compositor::Binding::~Binding()
{
g_bindings.remove(id);
}
// Compositor::Observer
void Compositor::Observer::bind(Id id)
{
DCHECK(!m_binding);
g_bindings.lockForWrite();
m_binding = g_bindings.findOrCreate(id);
DCHECK(!m_binding->observer);
m_binding->observer = this;
g_bindings.unlock();
}
void Compositor::Observer::unbind()
{
g_bindings.lockForWrite();
if (m_binding) {
m_binding->observer = nullptr;
if (m_binding->waitForRelease) {
m_binding->waitForRelease = false;
m_binding->condition.wakeOne();
}
if (m_binding->compositor == nullptr)
delete m_binding;
m_binding = nullptr;
}
g_bindings.unlock();
}
Compositor::Handle<Compositor> Compositor::Observer::compositor()
{
g_bindings.lock();
if (m_binding && m_binding->compositor)
return m_binding->compositor; // delay unlock
g_bindings.unlock();
return nullptr;
}
Compositor::Observer::~Observer()
{
DCHECK(!m_binding); // check that unbind() was called by derived final class
}
void Compositor::Observer::lockForRelease()
{
g_bindings.lockForWrite();
Q_ASSERT(m_binding);
m_binding->waitForRelease = true;
g_bindings.unlock();
}
// Compositor
void Compositor::bind(Id id)
{
DCHECK(!m_binding);
g_bindings.lockForWrite();
m_binding = g_bindings.findOrCreate(id);
DCHECK(!m_binding->compositor);
m_binding->compositor = this;
g_bindings.unlock();
}
void Compositor::unbind()
{
g_bindings.lockForWrite();
if (m_binding) {
if (m_binding->waitForRelease)
m_binding->condition.wait(&g_bindings.m_mutex);
m_binding->compositor = nullptr;
if (m_binding->observer == nullptr)
delete m_binding;
m_binding = nullptr;
}
g_bindings.unlock();
}
void Compositor::readyToSwap()
{
g_bindings.lock();
if (m_binding && m_binding->observer)
m_binding->observer->readyToSwap();
g_bindings.unlock();
}
void Compositor::waitForTexture()
{
}
void Compositor::releaseTexture()
{
}
QSGTexture *Compositor::texture(QQuickWindow *, uint32_t textureOptions)
{
Q_UNREACHABLE_RETURN(nullptr);
}
bool Compositor::textureIsFlipped()
{
Q_UNREACHABLE_RETURN(false);
}
void Compositor::releaseResources() { }
Compositor::Compositor(Type type) : m_type(type)
{
qCDebug(lcWebEngineCompositor, "Compositor Type: %s",
m_type == Type::Software ? "Software" : "Native");
qCDebug(lcWebEngineCompositor, "QPA Platform Plugin: %ls",
qUtf16Printable(QGuiApplication::platformName()));
}
Compositor::~Compositor()
{
DCHECK(!m_binding); // check that unbind() was called by derived final class
}
// static
void Compositor::unlockBindings()
{
g_bindings.unlock();
}
} // namespace QtWebEngineCore
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