LineBreakCache.cpp (1428B)
1 /* -*- Mode: C++; tab-width: 2; 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 "LineBreakCache.h" 7 8 #include "nsIObserverService.h" 9 #include "mozilla/Services.h" 10 11 using namespace mozilla; 12 using namespace mozilla::intl; 13 14 StaticAutoPtr<LineBreakCache> LineBreakCache::sBreakCache; 15 16 void LineBreakCache::Initialize() { 17 MOZ_ASSERT(NS_IsMainThread()); 18 19 nsCOMPtr<nsIObserverService> obs = services::GetObserverService(); 20 if (obs) { 21 obs->AddObserver(new LineBreakCache::Observer(), "memory-pressure", false); 22 } 23 } 24 25 void LineBreakCache::Shutdown() { 26 MOZ_ASSERT(NS_IsMainThread()); 27 sBreakCache = nullptr; 28 } 29 30 NS_IMPL_ISUPPORTS(LineBreakCache::Observer, nsIObserver) 31 32 NS_IMETHODIMP LineBreakCache::Observer::Observe(nsISupports* aSubject, 33 const char* aTopic, 34 const char16_t* aData) { 35 MOZ_ASSERT(NS_IsMainThread()); 36 37 if (strcmp(aTopic, "memory-pressure") == 0) { 38 // We don't delete the cache itself, as it would almost certainly just 39 // get immediately re-created; just clear its contents. 40 if (LineBreakCache::sBreakCache) { 41 LineBreakCache::sBreakCache->Clear(); 42 } 43 } 44 45 return NS_OK; 46 }