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Diffstat (limited to 'layout/painting/nsDisplayItemTypes.h')
-rw-r--r-- | layout/painting/nsDisplayItemTypes.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/layout/painting/nsDisplayItemTypes.h b/layout/painting/nsDisplayItemTypes.h new file mode 100644 index 0000000000..f0c7c333e0 --- /dev/null +++ b/layout/painting/nsDisplayItemTypes.h @@ -0,0 +1,73 @@ +/* -*- 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/. + */ +// IWYU pragma: private, include "nsDisplayList.h" + +/** + * 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. + */ + +#ifndef NSDISPLAYITEMTYPES_H_ +#define NSDISPLAYITEMTYPES_H_ + +enum class DisplayItemType : uint8_t { + TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */ + +#define DECLARE_DISPLAY_ITEM_TYPE(name, flags) TYPE_##name, +#include "nsDisplayItemTypesList.h" +#undef DECLARE_DISPLAY_ITEM_TYPE + + TYPE_MAX +}; + +enum { + // Number of bits needed to represent all types + TYPE_BITS = 8 +}; + +enum DisplayItemFlags { + TYPE_RENDERS_NO_IMAGES = 1 << 0, + TYPE_IS_CONTENTFUL = 1 << 1, + TYPE_IS_CONTAINER = 1 << 2 +}; + +inline const char* DisplayItemTypeName(DisplayItemType aType) { + switch (aType) { +#define DECLARE_DISPLAY_ITEM_TYPE(name, flags) \ + case DisplayItemType::TYPE_##name: \ + return #name; +#include "nsDisplayItemTypesList.h" +#undef DECLARE_DISPLAY_ITEM_TYPE + + default: + return "TYPE_UNKNOWN"; + } +} + +inline uint8_t GetDisplayItemFlagsForType(DisplayItemType aType) { + static const uint8_t flags[static_cast<uint32_t>(DisplayItemType::TYPE_MAX)] = + {0 +#define DECLARE_DISPLAY_ITEM_TYPE(name, flags) , flags +#include "nsDisplayItemTypesList.h" +#undef DECLARE_DISPLAY_ITEM_TYPE + }; + + return flags[static_cast<uint32_t>(aType)]; +} + +inline DisplayItemType GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey) { + static const uint32_t typeMask = (1 << TYPE_BITS) - 1; + DisplayItemType type = + static_cast<DisplayItemType>(aDisplayItemKey & typeMask); + NS_ASSERTION( + type >= DisplayItemType::TYPE_ZERO && type < DisplayItemType::TYPE_MAX, + "Invalid display item type!"); + return type; +} + +#endif /*NSDISPLAYITEMTYPES_H_*/ |