The Tor Browser: layout/base/nsDisplayItemTypes.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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  */

     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  */

    18 enum Type {

    19   TYPE_ZERO = 0, /** Spacer so that the first item starts at 1 */

    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

    27   TYPE_MAX

    28 };

    30 enum {

    31   // Number of bits needed to represent all types

    32   TYPE_BITS = 8

    33 };

    35 enum DisplayItemFlags {

    36   TYPE_RENDERS_NO_IMAGES = 1 << 0

    37 };

    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

    48     default: return "TYPE_UNKNOWN";

    49   }

    50 }

    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   };

    63   return flags[aType];

    64 }

    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 }

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