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Diffstat (limited to 'layout/base/nsDisplayItemTypes.h')
-rw-r--r-- | layout/base/nsDisplayItemTypes.h | 72 |
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; +} |