Add m-esr52 at 52.6.0

1 files changed, 72 insertions, 0 deletions

diff --git a/layout/base/nsDisplayItemTypes.h b/layout/base/nsDisplayItemTypes.h
new file mode 100644
index 000000000..e899245d0
--- /dev/null
+++ b/layout/base/nsDisplayItemTypes.h
@@ -0,0 +1,72 @@
+// IWYU pragma: private, include "nsDisplayList.h"
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=2 sw=2 et tw=78:
+ * 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/.
+ */
+
+/**
+ * It's useful to be able to dynamically check the type of certain items.
+ * Every subclass of nsDisplayItem must have a new type added here for the purposes
+ * of easy comparison and matching of items in different display lists.
+ * 
+ * This is #included inside nsDisplayItem.
+ */
+
+
+enum Type {
+  TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */
+
+#define DECLARE_DISPLAY_ITEM_TYPE(name) TYPE_##name,
+#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name,
+#include "nsDisplayItemTypesList.h"
+#undef DECLARE_DISPLAY_ITEM_TYPE
+#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
+
+  TYPE_MAX
+};
+
+enum {
+  // Number of bits needed to represent all types
+  TYPE_BITS = 8
+};
+
+enum DisplayItemFlags {
+  TYPE_RENDERS_NO_IMAGES = 1 << 0
+};
+
+static const char* DisplayItemTypeName(Type aType)
+{
+  switch (aType) {
+#define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name;
+#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name;
+#include "nsDisplayItemTypesList.h"
+#undef DECLARE_DISPLAY_ITEM_TYPE
+#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
+
+    default: return "TYPE_UNKNOWN";
+  }
+}
+
+static uint8_t GetDisplayItemFlagsForType(Type aType)
+{
+  static const uint8_t flags[TYPE_MAX] = {
+    0
+#define DECLARE_DISPLAY_ITEM_TYPE(name) ,0
+#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags
+#include "nsDisplayItemTypesList.h"
+#undef DECLARE_DISPLAY_ITEM_TYPE
+#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
+  };
+
+  return flags[aType];
+}
+
+static Type GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey)
+{
+  static const uint32_t typeMask = (1 << TYPE_BITS) - 1;
+  Type type = static_cast<Type>(aDisplayItemKey & typeMask);
+  NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!");
+  return type;
+}