michael@0: // IWYU pragma: private, include "nsDisplayList.h"
michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * vim: set ts=2 sw=2 et tw=78:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0:  */
michael@0: 
michael@0: /**
michael@0:  * It's useful to be able to dynamically check the type of certain items.
michael@0:  * Every subclass of nsDisplayItem must have a new type added here for the purposes
michael@0:  * of easy comparison and matching of items in different display lists.
michael@0:  * 
michael@0:  * This is #included inside nsDisplayItem.
michael@0:  */
michael@0: 
michael@0: 
michael@0: enum Type {
michael@0:   TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */
michael@0: 
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE(name) TYPE_##name,
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name,
michael@0: #include "nsDisplayItemTypesList.h"
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
michael@0: 
michael@0:   TYPE_MAX
michael@0: };
michael@0: 
michael@0: enum {
michael@0:   // Number of bits needed to represent all types
michael@0:   TYPE_BITS = 8
michael@0: };
michael@0: 
michael@0: enum DisplayItemFlags {
michael@0:   TYPE_RENDERS_NO_IMAGES = 1 << 0
michael@0: };
michael@0: 
michael@0: static const char* DisplayItemTypeName(Type aType)
michael@0: {
michael@0:   switch (aType) {
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name;
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name;
michael@0: #include "nsDisplayItemTypesList.h"
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
michael@0: 
michael@0:     default: return "TYPE_UNKNOWN";
michael@0:   }
michael@0: }
michael@0: 
michael@0: static uint8_t GetDisplayItemFlagsForType(Type aType)
michael@0: {
michael@0:   static const uint8_t flags[TYPE_MAX] = {
michael@0:     0
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE(name) ,0
michael@0: #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags
michael@0: #include "nsDisplayItemTypesList.h"
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE
michael@0: #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
michael@0:   };
michael@0: 
michael@0:   return flags[aType];
michael@0: }
michael@0: 
michael@0: static Type GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey)
michael@0: {
michael@0:   static const uint32_t typeMask = (1 << TYPE_BITS) - 1;
michael@0:   Type type = static_cast<Type>(aDisplayItemKey & typeMask);
michael@0:   NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!");
michael@0:   return type;
michael@0: }