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-rw-r--r--gfx/config/gfxVars.cpp149
1 files changed, 149 insertions, 0 deletions
diff --git a/gfx/config/gfxVars.cpp b/gfx/config/gfxVars.cpp
new file mode 100644
index 0000000000..77a8470c3c
--- /dev/null
+++ b/gfx/config/gfxVars.cpp
@@ -0,0 +1,149 @@
+/* -*- 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 "gfxVars.h"
+#include "gfxVarReceiver.h"
+#include "mozilla/dom/ContentChild.h"
+
+namespace mozilla {
+namespace gfx {
+
+StaticAutoPtr<gfxVars> gfxVars::sInstance;
+StaticAutoPtr<nsTArray<gfxVars::VarBase*>> gfxVars::sVarList;
+
+StaticAutoPtr<nsTArray<GfxVarUpdate>> gGfxVarInitUpdates;
+
+void gfxVars::SetValuesForInitialize(
+ const nsTArray<GfxVarUpdate>& aInitUpdates) {
+ // This should only be called once
+ MOZ_RELEASE_ASSERT(!gGfxVarInitUpdates);
+
+ // We expect aInitUpdates to be provided before any other gfxVars operation,
+ // and for sInstance to be null here, but handle the alternative.
+ if (sInstance) {
+ // Apply the updates, the object has been created already
+ for (const auto& varUpdate : aInitUpdates) {
+ ApplyUpdate(varUpdate);
+ }
+ } else {
+ // Save the values for Initialize call
+ gGfxVarInitUpdates = new nsTArray<GfxVarUpdate>(aInitUpdates.Clone());
+ }
+}
+
+void gfxVars::Initialize() {
+ if (sInstance) {
+ MOZ_RELEASE_ASSERT(
+ !gGfxVarInitUpdates,
+ "Initial updates should not be present after any gfxVars operation");
+ return;
+ }
+
+ // sVarList must be initialized first since it's used in the constructor for
+ // sInstance.
+ sVarList = new nsTArray<gfxVars::VarBase*>();
+ sInstance = new gfxVars;
+
+ // Note the GPU process is not handled here - it cannot send sync
+ // messages, so instead the initial data is pushed down.
+ if (XRE_IsContentProcess()) {
+ MOZ_ASSERT(gGfxVarInitUpdates,
+ "Initial updates should be provided in content process");
+ if (!gGfxVarInitUpdates) {
+ // No provided initial updates, sync-request them from parent.
+ nsTArray<GfxVarUpdate> initUpdates;
+ dom::ContentChild::GetSingleton()->SendGetGfxVars(&initUpdates);
+ gGfxVarInitUpdates = new nsTArray<GfxVarUpdate>(std::move(initUpdates));
+ }
+ for (const auto& varUpdate : *gGfxVarInitUpdates) {
+ ApplyUpdate(varUpdate);
+ }
+ gGfxVarInitUpdates = nullptr;
+ }
+}
+
+gfxVars::gfxVars() = default;
+
+void gfxVars::Shutdown() {
+ sInstance = nullptr;
+ sVarList = nullptr;
+ gGfxVarInitUpdates = nullptr;
+}
+
+/* static */
+void gfxVars::ApplyUpdate(const GfxVarUpdate& aUpdate) {
+ // Only subprocesses receive updates and apply them locally.
+ MOZ_ASSERT(!XRE_IsParentProcess());
+ MOZ_DIAGNOSTIC_ASSERT(sVarList || gGfxVarInitUpdates);
+ if (sVarList) {
+ sVarList->ElementAt(aUpdate.index())->SetValue(aUpdate.value());
+ } else if (gGfxVarInitUpdates) {
+ // Too early, we haven't been initialized, so just add to
+ // the array waiting for the initialization...
+ gGfxVarInitUpdates->AppendElement(aUpdate);
+ }
+}
+
+/* static */
+void gfxVars::AddReceiver(gfxVarReceiver* aReceiver) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ // Don't double-add receivers, in case a broken content process sends two
+ // init messages.
+ if (!sInstance->mReceivers.Contains(aReceiver)) {
+ sInstance->mReceivers.AppendElement(aReceiver);
+ }
+}
+
+/* static */
+void gfxVars::RemoveReceiver(gfxVarReceiver* aReceiver) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (sInstance) {
+ sInstance->mReceivers.RemoveElement(aReceiver);
+ }
+}
+
+/* static */
+nsTArray<GfxVarUpdate> gfxVars::FetchNonDefaultVars() {
+ MOZ_ASSERT(NS_IsMainThread());
+ MOZ_ASSERT(sVarList);
+
+ nsTArray<GfxVarUpdate> updates;
+ for (size_t i = 0; i < sVarList->Length(); i++) {
+ VarBase* var = sVarList->ElementAt(i);
+ if (var->HasDefaultValue()) {
+ continue;
+ }
+
+ GfxVarValue value;
+ var->GetValue(&value);
+
+ updates.AppendElement(GfxVarUpdate(i, value));
+ }
+
+ return updates;
+}
+
+gfxVars::VarBase::VarBase() {
+ mIndex = gfxVars::sVarList->Length();
+ gfxVars::sVarList->AppendElement(this);
+}
+
+void gfxVars::NotifyReceivers(VarBase* aVar) {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ GfxVarValue value;
+ aVar->GetValue(&value);
+
+ GfxVarUpdate update(aVar->Index(), value);
+ for (auto& receiver : mReceivers) {
+ receiver->OnVarChanged(update);
+ }
+}
+
+} // namespace gfx
+} // namespace mozilla