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/*
* Copyright (C) 2025 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WPEScreenSyncObserverDRM.h"
#include <chrono>
#include <errno.h>
#include <fcntl.h>
#include <thread>
#include <wtf/Condition.h>
#include <wtf/Function.h>
#include <wtf/Lock.h>
#include <wtf/RunLoop.h>
#include <wtf/Threading.h>
#include <wtf/Vector.h>
#include <wtf/glib/RunLoopSourcePriority.h>
#include <wtf/glib/WTFGType.h>
#include <xf86drm.h>
struct _WPEScreenSyncObserverDRMPrivate;
namespace WTF {
template<typename T> struct IsDeprecatedTimerSmartPointerException;
template<> struct IsDeprecatedTimerSmartPointerException<_WPEScreenSyncObserverDRMPrivate> : std::true_type { };
}
enum class State {
Stop,
Active,
Failed,
Invalid
};
struct _WPEScreenSyncObserverDRMPrivate {
_WPEScreenSyncObserverDRMPrivate()
: destroyThreadTimer(RunLoop::currentSingleton(), "_WPEScreenSyncObserverDRMPrivate::DestroyThreadTimer"_s, this, &_WPEScreenSyncObserverDRMPrivate::invalidate)
{
destroyThreadTimer.setPriority(RunLoopSourcePriority::ReleaseUnusedResourcesTimer);
}
void invalidate()
{
if (!thread) {
state = State::Invalid;
return;
}
destroyThreadTimer.stop();
{
Locker locker { lock };
state = State::Invalid;
condition.notifyAll();
}
thread->waitForCompletion();
thread = nullptr;
}
UnixFileDescriptor fd;
int crtcBitmask;
RefPtr<Thread> thread;
Lock lock;
Condition condition;
State state;
RunLoop::Timer destroyThreadTimer;
};
WEBKIT_DEFINE_FINAL_TYPE(WPEScreenSyncObserverDRM, wpe_screen_sync_observer_drm, WPE_TYPE_SCREEN_SYNC_OBSERVER, WPEScreenSyncObserver)
static void wpeScreenSyncObserverDRMDispose(GObject* object)
{
auto* priv = WPE_SCREEN_SYNC_OBSERVER_DRM(object)->priv;
priv->invalidate();
G_OBJECT_CLASS(wpe_screen_sync_observer_drm_parent_class)->dispose(object);
}
static void wpeScreenSyncObserverDRMStart(WPEScreenSyncObserver* observer)
{
auto* priv = WPE_SCREEN_SYNC_OBSERVER_DRM(observer)->priv;
Locker locker { priv->lock };
if (priv->state != State::Active)
priv->state = State::Active;
priv->destroyThreadTimer.stop();
if (!priv->thread) {
priv->thread = Thread::create("WPEScreenSyncObserverDRM"_s, [observer] {
auto* priv = WPE_SCREEN_SYNC_OBSERVER_DRM(observer)->priv;
while (true) {
{
Locker locker { priv->lock };
priv->condition.wait(priv->lock, [priv]() -> bool {
return priv->state != State::Stop;
});
if (priv->state == State::Invalid || priv->state == State::Failed)
return;
}
drmVBlank vblank;
vblank.request.type = static_cast<drmVBlankSeqType>(DRM_VBLANK_RELATIVE | priv->crtcBitmask);
vblank.request.sequence = 1;
vblank.request.signal = 0;
auto ret = drmWaitVBlank(priv->fd.value(), &vblank);
if (!ret || ret == -EPERM) {
if (ret == -EPERM) {
// This can happen when the screen is suspended and the web view hasn't noticed it.
// The display link should be stopped in those cases, but since it isn't, we can at
// least sleep for a while pretending the screen is on.
std::this_thread::sleep_for(std::chrono::milliseconds(500));
}
bool isActive;
{
Locker locker { priv->lock };
isActive = priv->state == State::Active;
}
if (isActive)
WPE_SCREEN_SYNC_OBSERVER_CLASS(wpe_screen_sync_observer_drm_parent_class)->sync(observer);
} else if (ret) {
drmError(ret, "WPEScreenSyncObserverDRM");
Locker locker { priv->lock };
priv->state = State::Failed;
}
}
}, ThreadType::Graphics, Thread::QOS::Default);
} else
priv->condition.notifyAll();
}
static void wpeScreenSyncObserverDRMStop(WPEScreenSyncObserver* observer)
{
auto* priv = WPE_SCREEN_SYNC_OBSERVER_DRM(observer)->priv;
Locker locker { priv->lock };
priv->state = State::Stop;
if (priv->thread)
priv->destroyThreadTimer.startOneShot(30_s);
}
static void wpe_screen_sync_observer_drm_class_init(WPEScreenSyncObserverDRMClass* screenSyncObserverDRMClass)
{
auto* objectClass = G_OBJECT_CLASS(screenSyncObserverDRMClass);
objectClass->dispose = wpeScreenSyncObserverDRMDispose;
auto* screenSyncObserverClass = WPE_SCREEN_SYNC_OBSERVER_CLASS(screenSyncObserverDRMClass);
screenSyncObserverClass->start = wpeScreenSyncObserverDRMStart;
screenSyncObserverClass->stop = wpeScreenSyncObserverDRMStop;
}
static int crtcBitmaskForIndex(uint32_t crtcIndex)
{
if (crtcIndex > 1)
return ((crtcIndex << DRM_VBLANK_HIGH_CRTC_SHIFT) & DRM_VBLANK_HIGH_CRTC_MASK);
if (crtcIndex > 0)
return DRM_VBLANK_SECONDARY;
return 0;
}
WPEScreenSyncObserver* wpeScreenSyncObserverDRMCreate(UnixFileDescriptor&& fd, int crtcIndex)
{
auto crtcBitmask = crtcBitmaskForIndex(crtcIndex);
drmVBlank vblank;
vblank.request.type = static_cast<drmVBlankSeqType>(DRM_VBLANK_RELATIVE | crtcBitmask);
vblank.request.sequence = 0;
vblank.request.signal = 0;
if (drmWaitVBlank(fd.value(), &vblank))
return nullptr;
auto* observer = WPE_SCREEN_SYNC_OBSERVER_DRM(g_object_new(WPE_TYPE_SCREEN_SYNC_OBSERVER_DRM, nullptr));
observer->priv->fd = WTFMove(fd);
observer->priv->crtcBitmask = crtcBitmask;
return WPE_SCREEN_SYNC_OBSERVER(observer);
}
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