gfx/thebes/gfxPlatformWorker.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfxPlatformWorker.h"
   7 #include "mozilla/dom/WorkerCommon.h"
   8 #include "mozilla/dom/WorkerRef.h"
   9 #include "mozilla/gfx/2D.h"
  10 #include "mozilla/ThreadLocal.h"
  11
  12 using namespace mozilla;
  13 using namespace mozilla::dom;
  14 using namespace mozilla::gfx;
  15
  16 MOZ_THREAD_LOCAL(gfxPlatformWorker*) gfxPlatformWorker::sInstance;
  17
  18 /* static */ gfxPlatformWorker* gfxPlatformWorker::Get() {
  19   if (!sInstance.init()) {
  20     return nullptr;
  21   }
  22
  23   gfxPlatformWorker* instance = sInstance.get();
  24   if (instance) {
  25     return instance;
  26   }
  27
  28   WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
  29   if (!workerPrivate) {
  30     return nullptr;
  31   }
  32
  33   RefPtr<WeakWorkerRef> workerRef = WeakWorkerRef::Create(
  34       workerPrivate, []() { gfxPlatformWorker::Shutdown(); });
  35   if (!workerRef) {
  36     return nullptr;
  37   }
  38
  39   instance = new gfxPlatformWorker(std::move(workerRef));
  40   sInstance.set(instance);
  41   return instance;
  42 }
  43
  44 /* static */ void gfxPlatformWorker::Shutdown() {
  45   if (!sInstance.init()) {
  46     return;
  47   }
  48
  49   gfxPlatformWorker* instance = sInstance.get();
  50   if (!instance) {
  51     return;
  52   }
  53
  54   sInstance.set(nullptr);
  55   delete instance;
  56 }
  57
  58 gfxPlatformWorker::gfxPlatformWorker(RefPtr<WeakWorkerRef>&& aWorkerRef)
  59     : mWorkerRef(std::move(aWorkerRef)) {}
  60
  61 gfxPlatformWorker::~gfxPlatformWorker() = default;
  62
  63 RefPtr<mozilla::gfx::DrawTarget>
  64 gfxPlatformWorker::ScreenReferenceDrawTarget() {
  65   if (!mScreenReferenceDrawTarget) {
  66     mScreenReferenceDrawTarget = Factory::CreateDrawTarget(
  67         BackendType::SKIA, IntSize(1, 1), SurfaceFormat::B8G8R8A8);
  68   }
  69   return mScreenReferenceDrawTarget;
  70 }