1 files changed, 318 insertions, 0 deletions
diff --git a/gfx/thebes/gfxFontInfoLoader.cpp b/gfx/thebes/gfxFontInfoLoader.cpp
new file mode 100644
index 0000000000..41cb519164
--- /dev/null
+++ b/gfx/thebes/gfxFontInfoLoader.cpp
@@ -0,0 +1,318 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "gfxFontInfoLoader.h"
+#include "mozilla/gfx/Logging.h"
+#include "mozilla/AppShutdown.h"
+#include "nsCRT.h"
+#include "nsIObserverService.h"
+#include "nsThreadUtils.h"  // for nsRunnable
+#include "gfxPlatformFontList.h"
+
+#ifdef XP_WIN
+#  include <windows.h>
+#endif
+
+using namespace mozilla;
+using services::GetObserverService;
+
+#define LOG_FONTINIT(args) \
+  MOZ_LOG(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug, args)
+#define LOG_FONTINIT_ENABLED() \
+  MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_fontinit), LogLevel::Debug)
+
+void FontInfoData::Load() {
+  TimeStamp start = TimeStamp::Now();
+
+  uint32_t i, n = mFontFamiliesToLoad.Length();
+  mLoadStats.families = n;
+  for (i = 0; i < n && !mCanceled; i++) {
+    // font file memory mapping sometimes causes exceptions - bug 1100949
+    MOZ_SEH_TRY { LoadFontFamilyData(mFontFamiliesToLoad[i]); }
+    MOZ_SEH_EXCEPT(EXCEPTION_EXECUTE_HANDLER) {
+      gfxCriticalError() << "Exception occurred reading font data for "
+                         << mFontFamiliesToLoad[i].get();
+    }
+  }
+
+  mLoadTime = TimeStamp::Now() - start;
+}
+
+class FontInfoLoadCompleteEvent : public Runnable {
+  virtual ~FontInfoLoadCompleteEvent() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(FontInfoLoadCompleteEvent, Runnable)
+
+  explicit FontInfoLoadCompleteEvent(FontInfoData* aFontInfo)
+      : mozilla::Runnable("FontInfoLoadCompleteEvent"), mFontInfo(aFontInfo) {}
+
+  NS_IMETHOD Run() override;
+
+ private:
+  RefPtr<FontInfoData> mFontInfo;
+};
+
+class AsyncFontInfoLoader : public Runnable {
+  virtual ~AsyncFontInfoLoader() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(AsyncFontInfoLoader, Runnable)
+
+  explicit AsyncFontInfoLoader(FontInfoData* aFontInfo)
+      : mozilla::Runnable("AsyncFontInfoLoader"), mFontInfo(aFontInfo) {
+    mCompleteEvent = new FontInfoLoadCompleteEvent(aFontInfo);
+  }
+
+  NS_IMETHOD Run() override;
+
+ private:
+  RefPtr<FontInfoData> mFontInfo;
+  RefPtr<FontInfoLoadCompleteEvent> mCompleteEvent;
+};
+
+class ShutdownThreadEvent : public Runnable {
+  virtual ~ShutdownThreadEvent() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(ShutdownThreadEvent, Runnable)
+
+  explicit ShutdownThreadEvent(nsIThread* aThread)
+      : mozilla::Runnable("ShutdownThreadEvent"), mThread(aThread) {}
+  NS_IMETHOD Run() override {
+    mThread->Shutdown();
+    return NS_OK;
+  }
+
+ private:
+  nsCOMPtr<nsIThread> mThread;
+};
+
+// runs on main thread after async font info loading is done
+nsresult FontInfoLoadCompleteEvent::Run() {
+  gfxFontInfoLoader* loader =
+      static_cast<gfxFontInfoLoader*>(gfxPlatformFontList::PlatformFontList());
+
+  loader->FinalizeLoader(mFontInfo);
+
+  return NS_OK;
+}
+
+// runs on separate thread
+nsresult AsyncFontInfoLoader::Run() {
+  // load platform-specific font info
+  mFontInfo->Load();
+
+  // post a completion event that transfer the data to the fontlist
+  NS_DispatchToMainThread(mCompleteEvent);
+
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(gfxFontInfoLoader::ShutdownObserver, nsIObserver)
+
+NS_IMETHODIMP
+gfxFontInfoLoader::ShutdownObserver::Observe(nsISupports* aSubject,
+                                             const char* aTopic,
+                                             const char16_t* someData) {
+  if (!nsCRT::strcmp(aTopic, "quit-application") ||
+      !nsCRT::strcmp(aTopic, "xpcom-shutdown")) {
+    mLoader->CancelLoader();
+  } else {
+    MOZ_ASSERT_UNREACHABLE("unexpected notification topic");
+  }
+  return NS_OK;
+}
+
+// StartLoader is usually called at startup with a (prefs-derived) delay value,
+// so that the async loader runs shortly after startup, to avoid competing for
+// disk i/o etc with other more critical operations.
+// However, it may be called with aDelay=0 if we find that the font info (e.g.
+// localized names) is needed for layout. In this case we start the loader
+// immediately; however, it is still an async process and we may use fallback
+// fonts to satisfy layout until it completes.
+void gfxFontInfoLoader::StartLoader(uint32_t aDelay) {
+  if (aDelay == 0 && (mState == stateTimerOff || mState == stateAsyncLoad)) {
+    // We were asked to load (async) without delay, but have already started,
+    // so just return and let the loader proceed.
+    return;
+  }
+
+  // We observe for "quit-application" above, so avoid initialization after it.
+  if (NS_WARN_IF(AppShutdown::IsInOrBeyond(ShutdownPhase::AppShutdown))) {
+    MOZ_ASSERT(!aDelay, "Delayed gfxFontInfoLoader startup after AppShutdown?");
+    return;
+  }
+
+  // sanity check
+  if (mState != stateInitial && mState != stateTimerOff &&
+      mState != stateTimerOnDelay) {
+    CancelLoader();
+  }
+
+  // Create mFontInfo when we're initially called to set up the delay, rather
+  // than when called by the DelayedStartCallback, because on the initial call
+  // we know we'll be holding the gfxPlatformFontList lock.
+  if (!mFontInfo) {
+    mFontInfo = CreateFontInfoData();
+    if (!mFontInfo) {
+      // The platform doesn't want anything loaded, so just bail out.
+      mState = stateTimerOff;
+      return;
+    }
+  }
+
+  AddShutdownObserver();
+
+  // Caller asked for a delay? ==> start async thread after a delay
+  if (aDelay) {
+    // Set up delay timer, or if there is already a timer in place, just
+    // leave it to do its thing. (This can happen if a StartLoader runnable
+    // was posted to the main thread from the InitFontList thread, but then
+    // before it had a chance to run and call StartLoader, the main thread
+    // re-initialized the list due to a platform notification and called
+    // StartLoader directly.)
+    if (mTimer) {
+      return;
+    }
+    mTimer = NS_NewTimer();
+    mTimer->InitWithNamedFuncCallback(DelayedStartCallback, this, aDelay,
+                                      nsITimer::TYPE_ONE_SHOT,
+                                      "gfxFontInfoLoader::StartLoader");
+    mState = stateTimerOnDelay;
+    return;
+  }
+
+  // Either we've been called back by the DelayedStartCallback when its timer
+  // fired, or a layout caller has passed aDelay=0 to ask the loader to run
+  // without further delay.
+
+  // Cancel the delay timer, if any.
+  if (mTimer) {
+    mTimer->Cancel();
+    mTimer = nullptr;
+  }
+
+  // initialize
+  InitLoader();
+
+  // start async load
+  nsresult rv = NS_NewNamedThread("Font Loader",
+                                  getter_AddRefs(mFontLoaderThread), nullptr);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  PRThread* prThread;
+  if (NS_SUCCEEDED(mFontLoaderThread->GetPRThread(&prThread))) {
+    PR_SetThreadPriority(prThread, PR_PRIORITY_LOW);
+  }
+
+  mState = stateAsyncLoad;
+
+  nsCOMPtr<nsIRunnable> loadEvent = new AsyncFontInfoLoader(mFontInfo);
+
+  mFontLoaderThread->Dispatch(loadEvent.forget(), NS_DISPATCH_NORMAL);
+
+  if (LOG_FONTINIT_ENABLED()) {
+    LOG_FONTINIT(
+        ("(fontinit) fontloader started (fontinfo: %p)\n", mFontInfo.get()));
+  }
+}
+
+class FinalizeLoaderRunnable : public Runnable {
+  virtual ~FinalizeLoaderRunnable() = default;
+
+ public:
+  NS_INLINE_DECL_REFCOUNTING_INHERITED(FinalizeLoaderRunnable, Runnable)
+
+  explicit FinalizeLoaderRunnable(gfxFontInfoLoader* aLoader)
+      : mozilla::Runnable("FinalizeLoaderRunnable"), mLoader(aLoader) {}
+
+  NS_IMETHOD Run() override {
+    nsresult rv;
+    if (mLoader->LoadFontInfo()) {
+      mLoader->CancelLoader();
+      rv = NS_OK;
+    } else {
+      nsCOMPtr<nsIRunnable> runnable = this;
+      rv = NS_DispatchToCurrentThreadQueue(
+          runnable.forget(), PR_INTERVAL_NO_TIMEOUT, EventQueuePriority::Idle);
+    }
+    return rv;
+  }
+
+ private:
+  gfxFontInfoLoader* mLoader;
+};
+
+void gfxFontInfoLoader::FinalizeLoader(FontInfoData* aFontInfo) {
+  // Avoid loading data if loader has already been canceled.
+  // This should mean that CancelLoader() ran and the Load
+  // thread has already Shutdown(), and likely before processing
+  // the Shutdown event it handled the load event and sent back
+  // our Completion event, thus we end up here.
+  if (mState != stateAsyncLoad || mFontInfo != aFontInfo) {
+    return;
+  }
+
+  mLoadTime = mFontInfo->mLoadTime;
+
+  MOZ_ASSERT(NS_IsMainThread());
+  nsCOMPtr<nsIRunnable> runnable = new FinalizeLoaderRunnable(this);
+  if (NS_FAILED(NS_DispatchToCurrentThreadQueue(runnable.forget(),
+                                                PR_INTERVAL_NO_TIMEOUT,
+                                                EventQueuePriority::Idle))) {
+    NS_WARNING("Failed to finalize async font info");
+  }
+}
+
+void gfxFontInfoLoader::CancelLoader() {
+  if (mState == stateInitial) {
+    return;
+  }
+  mState = stateTimerOff;
+  if (mTimer) {
+    mTimer->Cancel();
+    mTimer = nullptr;
+  }
+  if (mFontInfo)  // null during any initial delay
+    mFontInfo->mCanceled = true;
+  if (mFontLoaderThread) {
+    NS_DispatchToMainThread(new ShutdownThreadEvent(mFontLoaderThread));
+    mFontLoaderThread = nullptr;
+  }
+  RemoveShutdownObserver();
+  CleanupLoader();
+}
+
+gfxFontInfoLoader::~gfxFontInfoLoader() {
+  RemoveShutdownObserver();
+  MOZ_COUNT_DTOR(gfxFontInfoLoader);
+}
+
+void gfxFontInfoLoader::AddShutdownObserver() {
+  if (mObserver) {
+    return;
+  }
+
+  nsCOMPtr<nsIObserverService> obs = GetObserverService();
+  if (obs) {
+    mObserver = new ShutdownObserver(this);
+    obs->AddObserver(mObserver, "quit-application", false);
+    obs->AddObserver(mObserver, "xpcom-shutdown", false);
+  }
+}
+
+void gfxFontInfoLoader::RemoveShutdownObserver() {
+  if (mObserver) {
+    nsCOMPtr<nsIObserverService> obs = GetObserverService();
+    if (obs) {
+      obs->RemoveObserver(mObserver, "quit-application");
+      obs->RemoveObserver(mObserver, "xpcom-shutdown");
+      mObserver = nullptr;
+    }
+  }
+}