1 files changed, 81 insertions, 0 deletions
diff --git a/dom/animation/AnimationPerformanceWarning.h b/dom/animation/AnimationPerformanceWarning.h
new file mode 100644
index 0000000000..e59eade9e6
--- /dev/null
+++ b/dom/animation/AnimationPerformanceWarning.h
@@ -0,0 +1,81 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_AnimationPerformanceWarning_h
+#define mozilla_dom_AnimationPerformanceWarning_h
+
+#include <initializer_list>
+
+#include "mozilla/Maybe.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+// Represents the reason why we can't run the CSS property on the compositor.
+struct AnimationPerformanceWarning {
+  enum class Type : uint8_t {
+    None,
+    ContentTooLarge,
+    ContentTooLargeArea,
+    TransformBackfaceVisibilityHidden,
+    TransformSVG,
+    TransformWithGeometricProperties,
+    TransformWithSyncGeometricAnimations,
+    TransformFrameInactive,
+    TransformIsBlockedByImportantRules,
+    OpacityFrameInactive,
+    HasRenderingObserver,
+    HasCurrentColor,
+  };
+
+  explicit AnimationPerformanceWarning(Type aType) : mType(aType) {
+    MOZ_ASSERT(mType != Type::None);
+  }
+
+  AnimationPerformanceWarning(Type aType,
+                              std::initializer_list<int32_t> aParams)
+      : mType(aType) {
+    MOZ_ASSERT(mType != Type::None);
+    // FIXME:  Once std::initializer_list::size() become a constexpr function,
+    // we should use static_assert here.
+    MOZ_ASSERT(aParams.size() <= kMaxParamsForLocalization,
+               "The length of parameters should be less than "
+               "kMaxParamsForLocalization");
+    mParams.emplace(aParams);
+  }
+
+  // Maximum number of parameters passed to
+  // nsContentUtils::FormatLocalizedString to localize warning messages.
+  //
+  // NOTE: This constexpr can't be forward declared, so if you want to use
+  // this variable, please include this header file directly.
+  // This value is the same as the limit of nsStringBundle::FormatString.
+  // See the implementation of nsStringBundle::FormatString.
+  static constexpr uint8_t kMaxParamsForLocalization = 10;
+
+  // Indicates why this property could not be animated on the compositor.
+  Type mType;
+
+  // Optional parameters that may be used for localization.
+  Maybe<CopyableTArray<int32_t>> mParams;
+
+  bool ToLocalizedString(nsAString& aLocalizedString) const;
+  template <uint32_t N>
+  nsresult ToLocalizedStringWithIntParams(const char* aKey,
+                                          nsAString& aLocalizedString) const;
+
+  bool operator==(const AnimationPerformanceWarning& aOther) const {
+    return mType == aOther.mType && mParams == aOther.mParams;
+  }
+  bool operator!=(const AnimationPerformanceWarning& aOther) const {
+    return !(*this == aOther);
+  }
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_dom_AnimationPerformanceWarning_h