The Tor Browser / file comparison
comparison: layout/base/nsDisplayItemTypes.h
layout/base/nsDisplayItemTypes.h
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:79a97fe4bf66 |
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| 1 // IWYU pragma: private, include "nsDisplayList.h" | |
| 2 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 3 * vim: set ts=2 sw=2 et tw=78: | |
| 4 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 5 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
| 7 */ | |
| 8 | |
| 9 /** | |
| 10 * It's useful to be able to dynamically check the type of certain items. | |
| 11 * Every subclass of nsDisplayItem must have a new type added here for the purposes | |
| 12 * of easy comparison and matching of items in different display lists. | |
| 13 * | |
| 14 * This is #included inside nsDisplayItem. | |
| 15 */ | |
| 16 | |
| 17 | |
| 18 enum Type { | |
| 19 TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */ | |
| 20 | |
| 21 #define DECLARE_DISPLAY_ITEM_TYPE(name) TYPE_##name, | |
| 22 #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name, | |
| 23 #include "nsDisplayItemTypesList.h" | |
| 24 #undef DECLARE_DISPLAY_ITEM_TYPE | |
| 25 #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS | |
| 26 | |
| 27 TYPE_MAX | |
| 28 }; | |
| 29 | |
| 30 enum { | |
| 31 // Number of bits needed to represent all types | |
| 32 TYPE_BITS = 8 | |
| 33 }; | |
| 34 | |
| 35 enum DisplayItemFlags { | |
| 36 TYPE_RENDERS_NO_IMAGES = 1 << 0 | |
| 37 }; | |
| 38 | |
| 39 static const char* DisplayItemTypeName(Type aType) | |
| 40 { | |
| 41 switch (aType) { | |
| 42 #define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name; | |
| 43 #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name; | |
| 44 #include "nsDisplayItemTypesList.h" | |
| 45 #undef DECLARE_DISPLAY_ITEM_TYPE | |
| 46 #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS | |
| 47 | |
| 48 default: return "TYPE_UNKNOWN"; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 static uint8_t GetDisplayItemFlagsForType(Type aType) | |
| 53 { | |
| 54 static const uint8_t flags[TYPE_MAX] = { | |
| 55 0 | |
| 56 #define DECLARE_DISPLAY_ITEM_TYPE(name) ,0 | |
| 57 #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags | |
| 58 #include "nsDisplayItemTypesList.h" | |
| 59 #undef DECLARE_DISPLAY_ITEM_TYPE | |
| 60 #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS | |
| 61 }; | |
| 62 | |
| 63 return flags[aType]; | |
| 64 } | |
| 65 | |
| 66 static Type GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey) | |
| 67 { | |
| 68 static const uint32_t typeMask = (1 << TYPE_BITS) - 1; | |
| 69 Type type = static_cast<Type>(aDisplayItemKey & typeMask); | |
| 70 NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!"); | |
| 71 return type; | |
| 72 } |
