1 files changed, 53 insertions, 0 deletions
diff --git a/layout/style/LayerAnimationInfo.cpp b/layout/style/LayerAnimationInfo.cpp
new file mode 100644
index 000000000..8a119512b
--- /dev/null
+++ b/layout/style/LayerAnimationInfo.cpp
@@ -0,0 +1,53 @@
+/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
+/* 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 "LayerAnimationInfo.h"
+
+#include "nsCSSProps.h" // For nsCSSProps::PropHasFlags
+
+namespace mozilla {
+
+/* static */ const LayerAnimationInfo::Record LayerAnimationInfo::sRecords[] =
+  { { eCSSProperty_transform,
+      nsDisplayItem::TYPE_TRANSFORM,
+      nsChangeHint_UpdateTransformLayer },
+    { eCSSProperty_opacity,
+      nsDisplayItem::TYPE_OPACITY,
+      nsChangeHint_UpdateOpacityLayer } };
+
+#ifdef DEBUG
+/* static */ void
+LayerAnimationInfo::Initialize()
+{
+  for (const Record& record : sRecords) {
+    MOZ_ASSERT(nsCSSProps::PropHasFlags(record.mProperty,
+                                        CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR),
+               "CSS property with entry in LayerAnimation::sRecords does not "
+               "have the CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR flag");
+  }
+
+  // Check that every property with the flag for animating on the
+  // compositor has an entry in LayerAnimationInfo::sRecords.
+  for (nsCSSPropertyID prop = nsCSSPropertyID(0);
+       prop < eCSSProperty_COUNT;
+       prop = nsCSSPropertyID(prop + 1)) {
+    if (nsCSSProps::PropHasFlags(prop,
+                                 CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR)) {
+      bool found = false;
+      for (const Record& record : sRecords) {
+        if (record.mProperty == prop) {
+          found = true;
+          break;
+        }
+      }
+      MOZ_ASSERT(found,
+                 "CSS property with the CSS_PROPERTY_CAN_ANIMATE_ON_COMPOSITOR "
+                 "flag does not have an entry in LayerAnimationInfo::sRecords");
+    }
+  }
+}
+#endif
+
+} // namespace mozilla