зеркало из https://github.com/mozilla/gecko-dev.git
69 строки
2.0 KiB
C
69 строки
2.0 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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// IWYU pragma: private, include "nsDisplayList.h"
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/**
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* It's useful to be able to dynamically check the type of certain items.
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* Every subclass of nsDisplayItem must have a new type added here for the purposes
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* of easy comparison and matching of items in different display lists.
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*/
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#ifndef NSDISPLAYITEMTYPES_H_
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#define NSDISPLAYITEMTYPES_H_
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enum class DisplayItemType {
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TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */
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#define DECLARE_DISPLAY_ITEM_TYPE(name,flags) TYPE_##name,
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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TYPE_MAX
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};
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enum {
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// Number of bits needed to represent all types
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TYPE_BITS = 8
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};
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enum DisplayItemFlags {
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TYPE_RENDERS_NO_IMAGES = 1 << 0
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};
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inline const char* DisplayItemTypeName(DisplayItemType aType)
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{
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switch (aType) {
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#define DECLARE_DISPLAY_ITEM_TYPE(name,flags) case DisplayItemType::TYPE_##name: return #name;
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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default: return "TYPE_UNKNOWN";
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}
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}
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inline uint8_t GetDisplayItemFlagsForType(DisplayItemType aType)
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{
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static const uint8_t flags[static_cast<uint32_t>(DisplayItemType::TYPE_MAX)] = {
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0
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#define DECLARE_DISPLAY_ITEM_TYPE(name,flags) ,flags
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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};
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return flags[static_cast<uint32_t>(aType)];
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}
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inline DisplayItemType GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey)
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{
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static const uint32_t typeMask = (1 << TYPE_BITS) - 1;
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DisplayItemType type = static_cast<DisplayItemType>(aDisplayItemKey & typeMask);
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NS_ASSERTION(type >= DisplayItemType::TYPE_ZERO && type < DisplayItemType::TYPE_MAX, "Invalid display item type!");
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return type;
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}
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#endif /*NSDISPLAYITEMTYPES_H_*/
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