layout/base/nsDisplayItemTypes.h@b8a032363ba2 (annotated)
layout/base/nsDisplayItemTypes.h
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | // IWYU pragma: private, include "nsDisplayList.h" |
| michael@0 | 2 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 3 | * vim: set ts=2 sw=2 et tw=78: |
| michael@0 | 4 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 5 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 6 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| michael@0 | 7 | */ |
| michael@0 | 8 | |
| michael@0 | 9 | /** |
| michael@0 | 10 | * It's useful to be able to dynamically check the type of certain items. |
| michael@0 | 11 | * Every subclass of nsDisplayItem must have a new type added here for the purposes |
| michael@0 | 12 | * of easy comparison and matching of items in different display lists. |
| michael@0 | 13 | * |
| michael@0 | 14 | * This is #included inside nsDisplayItem. |
| michael@0 | 15 | */ |
| michael@0 | 16 | |
| michael@0 | 17 | |
| michael@0 | 18 | enum Type { |
| michael@0 | 19 | TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */ |
| michael@0 | 20 | |
| michael@0 | 21 | #define DECLARE_DISPLAY_ITEM_TYPE(name) TYPE_##name, |
| michael@0 | 22 | #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) TYPE_##name, |
| michael@0 | 23 | #include "nsDisplayItemTypesList.h" |
| michael@0 | 24 | #undef DECLARE_DISPLAY_ITEM_TYPE |
| michael@0 | 25 | #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS |
| michael@0 | 26 | |
| michael@0 | 27 | TYPE_MAX |
| michael@0 | 28 | }; |
| michael@0 | 29 | |
| michael@0 | 30 | enum { |
| michael@0 | 31 | // Number of bits needed to represent all types |
| michael@0 | 32 | TYPE_BITS = 8 |
| michael@0 | 33 | }; |
| michael@0 | 34 | |
| michael@0 | 35 | enum DisplayItemFlags { |
| michael@0 | 36 | TYPE_RENDERS_NO_IMAGES = 1 << 0 |
| michael@0 | 37 | }; |
| michael@0 | 38 | |
| michael@0 | 39 | static const char* DisplayItemTypeName(Type aType) |
| michael@0 | 40 | { |
| michael@0 | 41 | switch (aType) { |
| michael@0 | 42 | #define DECLARE_DISPLAY_ITEM_TYPE(name) case TYPE_##name: return #name; |
| michael@0 | 43 | #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) case TYPE_##name: return #name; |
| michael@0 | 44 | #include "nsDisplayItemTypesList.h" |
| michael@0 | 45 | #undef DECLARE_DISPLAY_ITEM_TYPE |
| michael@0 | 46 | #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS |
| michael@0 | 47 | |
| michael@0 | 48 | default: return "TYPE_UNKNOWN"; |
| michael@0 | 49 | } |
| michael@0 | 50 | } |
| michael@0 | 51 | |
| michael@0 | 52 | static uint8_t GetDisplayItemFlagsForType(Type aType) |
| michael@0 | 53 | { |
| michael@0 | 54 | static const uint8_t flags[TYPE_MAX] = { |
| michael@0 | 55 | 0 |
| michael@0 | 56 | #define DECLARE_DISPLAY_ITEM_TYPE(name) ,0 |
| michael@0 | 57 | #define DECLARE_DISPLAY_ITEM_TYPE_FLAGS(name,flags) ,flags |
| michael@0 | 58 | #include "nsDisplayItemTypesList.h" |
| michael@0 | 59 | #undef DECLARE_DISPLAY_ITEM_TYPE |
| michael@0 | 60 | #undef DECLARE_DISPLAY_ITEM_TYPE_FLAGS |
| michael@0 | 61 | }; |
| michael@0 | 62 | |
| michael@0 | 63 | return flags[aType]; |
| michael@0 | 64 | } |
| michael@0 | 65 | |
| michael@0 | 66 | static Type GetDisplayItemTypeFromKey(uint32_t aDisplayItemKey) |
| michael@0 | 67 | { |
| michael@0 | 68 | static const uint32_t typeMask = (1 << TYPE_BITS) - 1; |
| michael@0 | 69 | Type type = static_cast<Type>(aDisplayItemKey & typeMask); |
| michael@0 | 70 | NS_ASSERTION(type > TYPE_ZERO && type < TYPE_MAX, "Invalid display item type!"); |
| michael@0 | 71 | return type; |
| michael@0 | 72 | } |
