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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /gfx/layers/MemoryPressureObserver.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/layers/MemoryPressureObserver.cpp')
-rw-r--r--gfx/layers/MemoryPressureObserver.cpp77
1 files changed, 77 insertions, 0 deletions
diff --git a/gfx/layers/MemoryPressureObserver.cpp b/gfx/layers/MemoryPressureObserver.cpp
new file mode 100644
index 0000000000..16c9ea4b1e
--- /dev/null
+++ b/gfx/layers/MemoryPressureObserver.cpp
@@ -0,0 +1,77 @@
+/* -*- 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 "MemoryPressureObserver.h"
+
+#include "mozilla/Services.h"
+#include "nsCOMPtr.h"
+#include "nsDependentString.h"
+#include "nsIObserverService.h"
+#include "nsLiteralString.h"
+
+namespace mozilla {
+namespace layers {
+
+MemoryPressureObserver::MemoryPressureObserver(
+ MemoryPressureListener* aListener)
+ : mListener(aListener) {}
+
+MemoryPressureObserver::~MemoryPressureObserver() {
+ // If this assertion is hit we probably forgot to unregister the observer.
+ MOZ_ASSERT(!mListener);
+}
+
+already_AddRefed<MemoryPressureObserver> MemoryPressureObserver::Create(
+ MemoryPressureListener* aListener) {
+ nsCOMPtr<nsIObserverService> service = services::GetObserverService();
+
+ if (!service) {
+ return nullptr;
+ }
+
+ RefPtr<MemoryPressureObserver> observer =
+ new MemoryPressureObserver(aListener);
+
+ bool useWeakRef = false;
+ service->AddObserver(observer, "memory-pressure", useWeakRef);
+
+ return observer.forget();
+}
+
+void MemoryPressureObserver::Unregister() {
+ if (!mListener) {
+ return;
+ }
+
+ nsCOMPtr<nsIObserverService> service = services::GetObserverService();
+ if (service) {
+ service->RemoveObserver(this, "memory-pressure");
+ }
+
+ mListener = nullptr;
+}
+
+NS_IMETHODIMP
+MemoryPressureObserver::Observe(nsISupports* aSubject, const char* aTopic,
+ const char16_t* aData) {
+ if (mListener && strcmp(aTopic, "memory-pressure") == 0) {
+ MemoryPressureReason reason = MemoryPressureReason::LOW_MEMORY;
+ auto reason_string = nsDependentString(aData);
+ if (StringBeginsWith(reason_string, u"low-memory-ongoing"_ns)) {
+ reason = MemoryPressureReason::LOW_MEMORY_ONGOING;
+ } else if (StringBeginsWith(reason_string, u"heap-minimize"_ns)) {
+ reason = MemoryPressureReason::HEAP_MINIMIZE;
+ }
+ mListener->OnMemoryPressure(reason);
+ }
+
+ return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(MemoryPressureObserver, nsIObserver)
+
+} // namespace layers
+} // namespace mozilla