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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "CanvasManagerChild.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Swizzle.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/layers/CompositorManagerChild.h"
#include "mozilla/webgpu/WebGPUChild.h"
using namespace mozilla::dom;
using namespace mozilla::layers;
namespace mozilla::gfx {
// The IPDL actor holds a strong reference to CanvasManagerChild which we use
// to keep it alive. The owning thread will tell us to close when it is
// shutdown, either via CanvasManagerChild::Shutdown for the main thread, or
// via a shutdown callback from IPCWorkerRef for worker threads.
MOZ_THREAD_LOCAL(CanvasManagerChild*) CanvasManagerChild::sLocalManager;
Atomic<uint32_t> CanvasManagerChild::sNextId(1);
CanvasManagerChild::CanvasManagerChild(uint32_t aId) : mId(aId) {}
CanvasManagerChild::~CanvasManagerChild() = default;
void CanvasManagerChild::ActorDestroy(ActorDestroyReason aReason) {
if (sLocalManager.get() == this) {
sLocalManager.set(nullptr);
}
}
void CanvasManagerChild::Destroy() {
// The caller has a strong reference. ActorDestroy will clear sLocalManager.
Close();
mWorkerRef = nullptr;
}
/* static */ void CanvasManagerChild::Shutdown() {
MOZ_ASSERT(NS_IsMainThread());
// The worker threads should destroy their own CanvasManagerChild instances
// during their shutdown sequence. We just need to take care of the main
// thread. We need to init here because we may have never created a
// CanvasManagerChild for the main thread in the first place.
if (sLocalManager.init()) {
RefPtr<CanvasManagerChild> manager = sLocalManager.get();
if (manager) {
manager->Destroy();
}
}
}
/* static */ bool CanvasManagerChild::CreateParent(
ipc::Endpoint<PCanvasManagerParent>&& aEndpoint) {
MOZ_ASSERT(NS_IsMainThread());
CompositorManagerChild* manager = CompositorManagerChild::GetInstance();
if (!manager || !manager->CanSend()) {
return false;
}
return manager->SendInitCanvasManager(std::move(aEndpoint));
}
/* static */ CanvasManagerChild* CanvasManagerChild::Get() {
if (NS_WARN_IF(!sLocalManager.init())) {
return nullptr;
}
CanvasManagerChild* managerWeak = sLocalManager.get();
if (managerWeak) {
return managerWeak;
}
// We are only used on the main thread, or on worker threads.
WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT_IF(!worker, NS_IsMainThread());
ipc::Endpoint<PCanvasManagerParent> parentEndpoint;
ipc::Endpoint<PCanvasManagerChild> childEndpoint;
auto compositorPid = CompositorManagerChild::GetOtherPid();
if (NS_WARN_IF(!compositorPid)) {
return nullptr;
}
nsresult rv = PCanvasManager::CreateEndpoints(
compositorPid, base::GetCurrentProcId(), &parentEndpoint, &childEndpoint);
if (NS_WARN_IF(NS_FAILED(rv))) {
return nullptr;
}
auto manager = MakeRefPtr<CanvasManagerChild>(sNextId++);
if (worker) {
// The IPCWorkerRef will let us know when the worker is shutting down. This
// will let us clear our threadlocal reference and close the actor. We rely
// upon an explicit shutdown for the main thread.
manager->mWorkerRef = IPCWorkerRef::Create(
worker, "CanvasManager", [manager]() { manager->Destroy(); });
if (NS_WARN_IF(!manager->mWorkerRef)) {
return nullptr;
}
}
if (NS_WARN_IF(!childEndpoint.Bind(manager))) {
return nullptr;
}
// We can't talk to the compositor process directly from worker threads, but
// the main thread can via CompositorManagerChild.
if (worker) {
worker->DispatchToMainThread(NS_NewRunnableFunction(
"CanvasManagerChild::CreateParent",
[parentEndpoint = std::move(parentEndpoint)]() {
CreateParent(
std::move(const_cast<ipc::Endpoint<PCanvasManagerParent>&&>(
parentEndpoint)));
}));
} else if (NS_WARN_IF(!CreateParent(std::move(parentEndpoint)))) {
return nullptr;
}
manager->SendInitialize(manager->Id());
sLocalManager.set(manager);
return manager;
}
RefPtr<webgpu::WebGPUChild> CanvasManagerChild::GetWebGPUChild() {
if (!mWebGPUChild) {
mWebGPUChild = MakeAndAddRef<webgpu::WebGPUChild>();
if (!SendPWebGPUConstructor(mWebGPUChild)) {
mWebGPUChild = nullptr;
}
}
return mWebGPUChild;
}
already_AddRefed<DataSourceSurface> CanvasManagerChild::GetSnapshot(
uint32_t aManagerId, int32_t aProtocolId,
const Maybe<RemoteTextureOwnerId>& aOwnerId, SurfaceFormat aFormat,
bool aPremultiply, bool aYFlip) {
if (!CanSend()) {
return nullptr;
}
webgl::FrontBufferSnapshotIpc res;
if (!SendGetSnapshot(aManagerId, aProtocolId, aOwnerId, &res)) {
return nullptr;
}
if (!res.shmem || !res.shmem->IsReadable()) {
return nullptr;
}
auto guard = MakeScopeExit([&] { DeallocShmem(res.shmem.ref()); });
if (!res.surfSize.x || !res.surfSize.y || res.surfSize.x > INT32_MAX ||
res.surfSize.y > INT32_MAX) {
return nullptr;
}
IntSize size(res.surfSize.x, res.surfSize.y);
CheckedInt32 stride = CheckedInt32(size.width) * sizeof(uint32_t);
if (!stride.isValid()) {
return nullptr;
}
CheckedInt32 length = stride * size.height;
if (!length.isValid() ||
size_t(length.value()) != res.shmem->Size<uint8_t>()) {
return nullptr;
}
SurfaceFormat format =
IsOpaque(aFormat) ? SurfaceFormat::B8G8R8X8 : SurfaceFormat::B8G8R8A8;
RefPtr<DataSourceSurface> surface =
Factory::CreateDataSourceSurfaceWithStride(size, format, stride.value(),
/* aZero */ false);
if (!surface) {
return nullptr;
}
gfx::DataSourceSurface::ScopedMap map(surface,
gfx::DataSourceSurface::READ_WRITE);
if (!map.IsMapped()) {
return nullptr;
}
// The buffer we may readback from the canvas could be R8G8B8A8, not
// premultiplied, and/or has its rows iverted. For the general case, we want
// surfaces represented as premultiplied B8G8R8A8, with its rows ordered top
// to bottom. Given this path is used for screenshots/SurfaceFromElement,
// that's the representation we need.
if (aYFlip) {
if (aPremultiply) {
if (!PremultiplyYFlipData(res.shmem->get<uint8_t>(), stride.value(),
aFormat, map.GetData(), map.GetStride(), format,
size)) {
return nullptr;
}
} else {
if (!SwizzleYFlipData(res.shmem->get<uint8_t>(), stride.value(), aFormat,
map.GetData(), map.GetStride(), format, size)) {
return nullptr;
}
}
} else if (aPremultiply) {
if (!PremultiplyData(res.shmem->get<uint8_t>(), stride.value(), aFormat,
map.GetData(), map.GetStride(), format, size)) {
return nullptr;
}
} else {
if (!SwizzleData(res.shmem->get<uint8_t>(), stride.value(), aFormat,
map.GetData(), map.GetStride(), format, size)) {
return nullptr;
}
}
return surface.forget();
}
} // namespace mozilla::gfx
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