Add m-esr52 at 52.6.0

1 files changed, 313 insertions, 0 deletions

diff --git a/gfx/config/gfxFeature.cpp b/gfx/config/gfxFeature.cpp
new file mode 100644
index 000000000..53e291ffe
--- /dev/null
+++ b/gfx/config/gfxFeature.cpp
@@ -0,0 +1,313 @@
+/* -*- Mode: C++; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* vim: set sts=2 ts=8 sw=2 tw=99 et: */
+/* 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 "gfxFeature.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/Sprintf.h"
+#include "nsString.h"
+
+namespace mozilla {
+namespace gfx {
+
+bool
+FeatureState::IsEnabled() const
+{
+  return IsInitialized() && IsFeatureStatusSuccess(GetValue());
+}
+
+FeatureStatus
+FeatureState::GetValue() const
+{
+  if (!IsInitialized()) {
+    return FeatureStatus::Unused;
+  }
+
+  if (mRuntime.mStatus != FeatureStatus::Unused) {
+    return mRuntime.mStatus;
+  }
+  if (mUser.mStatus == FeatureStatus::ForceEnabled) {
+    return FeatureStatus::ForceEnabled;
+  }
+  if (mEnvironment.mStatus != FeatureStatus::Unused) {
+    return mEnvironment.mStatus;
+  }
+  if (mUser.mStatus != FeatureStatus::Unused) {
+    return mUser.mStatus;
+  }
+  return mDefault.mStatus;
+}
+
+bool
+FeatureState::SetDefault(bool aEnable,
+                         FeatureStatus aDisableStatus,
+                         const char* aDisableMessage)
+{
+  if (!aEnable) {
+    DisableByDefault(aDisableStatus, aDisableMessage,
+                     NS_LITERAL_CSTRING("FEATURE_FAILURE_DISABLED"));
+    return false;
+  }
+  EnableByDefault();
+  return true;
+}
+
+void
+FeatureState::SetDefaultFromPref(const char* aPrefName,
+                                 bool aIsEnablePref,
+                                 bool aDefaultValue)
+{
+  bool baseValue = Preferences::GetDefaultBool(aPrefName, aDefaultValue);
+  SetDefault(baseValue == aIsEnablePref, FeatureStatus::Disabled, "Disabled by default");
+
+  if (Preferences::HasUserValue(aPrefName)) {
+    bool userValue = Preferences::GetBool(aPrefName, aDefaultValue);
+    if (userValue == aIsEnablePref) {
+      nsCString message("Enabled via ");
+      message.AppendASCII(aPrefName);
+      UserEnable(message.get());
+    } else {
+      nsCString message("Disabled via ");
+      message.AppendASCII(aPrefName);
+      UserDisable(message.get(), NS_LITERAL_CSTRING("FEATURE_FAILURE_PREF_OFF"));
+    }
+  }
+}
+
+bool
+FeatureState::InitOrUpdate(bool aEnable,
+                           FeatureStatus aDisableStatus,
+                           const char* aDisableMessage)
+{
+  if (!IsInitialized()) {
+    return SetDefault(aEnable, aDisableStatus, aDisableMessage);
+  }
+  return MaybeSetFailed(aEnable, aDisableStatus, aDisableMessage, nsCString());
+}
+
+void
+FeatureState::UserEnable(const char* aMessage)
+{
+  AssertInitialized();
+  SetUser(FeatureStatus::Available, aMessage);
+}
+
+void
+FeatureState::UserForceEnable(const char* aMessage)
+{
+  AssertInitialized();
+  SetUser(FeatureStatus::ForceEnabled, aMessage);
+}
+
+void
+FeatureState::UserDisable(const char* aMessage, const nsACString& aFailureId)
+{
+  AssertInitialized();
+  SetUser(FeatureStatus::Disabled, aMessage);
+  SetFailureId(aFailureId);
+}
+
+void
+FeatureState::Disable(FeatureStatus aStatus, const char* aMessage,
+                      const nsACString& aFailureId)
+{
+  AssertInitialized();
+
+  // We should never bother setting an environment status to "enabled," since
+  // it could override an explicit user decision to disable it.
+  MOZ_ASSERT(IsFeatureStatusFailure(aStatus));
+
+  SetEnvironment(aStatus, aMessage);
+  SetFailureId(aFailureId);
+}
+
+void
+FeatureState::SetFailed(FeatureStatus aStatus, const char* aMessage,
+                        const nsACString& aFailureId)
+{
+  AssertInitialized();
+
+  // We should never bother setting a runtime status to "enabled," since it could
+  // override an explicit user decision to disable it.
+  MOZ_ASSERT(IsFeatureStatusFailure(aStatus));
+
+  SetRuntime(aStatus, aMessage);
+  SetFailureId(aFailureId);
+}
+
+bool
+FeatureState::MaybeSetFailed(bool aEnable, FeatureStatus aStatus, const char* aMessage,
+                             const nsACString& aFailureId)
+{
+  if (!aEnable) {
+    SetFailed(aStatus, aMessage, aFailureId);
+    return false;
+  }
+  return true;
+}
+
+bool
+FeatureState::MaybeSetFailed(FeatureStatus aStatus, const char* aMessage,
+                             const nsACString& aFailureId)
+{
+  return MaybeSetFailed(IsFeatureStatusSuccess(aStatus), aStatus, aMessage,
+                        aFailureId);
+}
+
+bool
+FeatureState::DisabledByDefault() const
+{
+  return mDefault.mStatus != FeatureStatus::Available;
+}
+
+bool
+FeatureState::IsForcedOnByUser() const
+{
+  AssertInitialized();
+  return mUser.mStatus == FeatureStatus::ForceEnabled;
+}
+
+void
+FeatureState::EnableByDefault()
+{
+  // User/runtime decisions should not have been made yet.
+  MOZ_ASSERT(!mUser.IsInitialized());
+  MOZ_ASSERT(!mEnvironment.IsInitialized());
+  MOZ_ASSERT(!mRuntime.IsInitialized());
+
+  mDefault.Set(FeatureStatus::Available);
+}
+
+void
+FeatureState::DisableByDefault(FeatureStatus aStatus, const char* aMessage,
+                               const nsACString& aFailureId)
+{
+  // User/runtime decisions should not have been made yet.
+  MOZ_ASSERT(!mUser.IsInitialized());
+  MOZ_ASSERT(!mEnvironment.IsInitialized());
+  MOZ_ASSERT(!mRuntime.IsInitialized());
+
+  mDefault.Set(aStatus, aMessage);
+  SetFailureId(aFailureId);
+}
+
+void
+FeatureState::SetUser(FeatureStatus aStatus, const char* aMessage)
+{
+  // Default decision must have been made, but not runtime or environment.
+  MOZ_ASSERT(mDefault.IsInitialized());
+  MOZ_ASSERT(!mEnvironment.IsInitialized());
+  MOZ_ASSERT(!mRuntime.IsInitialized());
+
+  mUser.Set(aStatus, aMessage);
+}
+
+void
+FeatureState::SetEnvironment(FeatureStatus aStatus, const char* aMessage)
+{
+  // Default decision must have been made, but not runtime.
+  MOZ_ASSERT(mDefault.IsInitialized());
+  MOZ_ASSERT(!mRuntime.IsInitialized());
+
+  mEnvironment.Set(aStatus, aMessage);
+}
+
+void
+FeatureState::SetRuntime(FeatureStatus aStatus, const char* aMessage)
+{
+  AssertInitialized();
+
+  mRuntime.Set(aStatus, aMessage);
+}
+
+const char*
+FeatureState::GetRuntimeMessage() const
+{
+  MOZ_ASSERT(IsFeatureStatusFailure(mRuntime.mStatus));
+  return mRuntime.mMessage;
+}
+
+void
+FeatureState::ForEachStatusChange(const StatusIterCallback& aCallback) const
+{
+  AssertInitialized();
+
+  aCallback("default", mDefault.mStatus, mDefault.MessageOrNull());
+  if (mUser.IsInitialized()) {
+    aCallback("user", mUser.mStatus, mUser.Message());
+  }
+  if (mEnvironment.IsInitialized()) {
+    aCallback("env", mEnvironment.mStatus, mEnvironment.Message());
+  }
+  if (mRuntime.IsInitialized()) {
+    aCallback("runtime", mRuntime.mStatus, mRuntime.Message());
+  }
+}
+
+void
+FeatureState::SetFailureId(const nsACString& aFailureId)
+{
+  if (mFailureId.IsEmpty()) {
+    mFailureId = aFailureId;
+  }
+}
+
+const char*
+FeatureState::GetFailureMessage() const
+{
+  AssertInitialized();
+  MOZ_ASSERT(!IsEnabled());
+
+  if (mRuntime.mStatus != FeatureStatus::Unused &&
+      IsFeatureStatusFailure(mRuntime.mStatus))
+  {
+    return mRuntime.mMessage;
+  }
+  if (mEnvironment.mStatus != FeatureStatus::Unused &&
+      IsFeatureStatusFailure(mEnvironment.mStatus))
+  {
+    return mEnvironment.mMessage;
+  }
+  if (mUser.mStatus != FeatureStatus::Unused &&
+      IsFeatureStatusFailure(mUser.mStatus))
+  {
+    return mUser.mMessage;
+  }
+
+  MOZ_ASSERT(IsFeatureStatusFailure(mDefault.mStatus));
+  return mDefault.mMessage;
+}
+
+const nsCString&
+FeatureState::GetFailureId() const
+{
+  MOZ_ASSERT(!IsEnabled());
+  return mFailureId;
+}
+
+void
+FeatureState::Reset()
+{
+  mDefault.Set(FeatureStatus::Unused);
+  mUser.Set(FeatureStatus::Unused);
+  mEnvironment.Set(FeatureStatus::Unused);
+  mRuntime.Set(FeatureStatus::Unused);
+  mFailureId = nsCString();
+}
+
+void
+FeatureState::Instance::Set(FeatureStatus aStatus, const char* aMessage /* = nullptr */)
+{
+  mStatus = aStatus;
+  if (aMessage) {
+    SprintfLiteral(mMessage, "%s", aMessage);
+  } else {
+    mMessage[0] = '\0';
+  }
+}
+
+} // namespace gfx
+} // namespace mozilla