72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
// IWYU pragma: private, include "nsDisplayList.h"
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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/**
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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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* This is #included inside nsDisplayItem.
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*/
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enum Type {
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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) TYPE_##name,
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#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name,
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
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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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static const char* DisplayItemTypeName(Type aType)
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{
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switch (aType) {
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#define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name;
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#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name;
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
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default: return "TYPE_UNKNOWN";
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}
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}
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static uint8_t GetDisplayItemFlagsForType(Type aType)
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{
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static const uint8_t flags[TYPE_MAX] = {
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0
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#define DECLARE_DISPLAY_ITEM_TYPE(name) ,0
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#define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags
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#include "nsDisplayItemTypesList.h"
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#undef DECLARE_DISPLAY_ITEM_TYPE
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#undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS
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};
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return flags[aType];
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}
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static Type 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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Type type = static_cast<Type>(aDisplayItemKey & typeMask);
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NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!");
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return type;
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}
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