layout/style/nsStyleStructFwd.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /*
   7  * Forward declarations to avoid including all of nsStyleStruct.h.
   8  */
   9
  10 #ifndef nsStyleStructFwd_h_
  11 #define nsStyleStructFwd_h_
  12
  13 enum nsStyleStructID {
  14
  15 /*
  16  * Define the constants eStyleStruct_Font, etc.
  17  *
  18  * The C++ standard, section 7.2, guarantees that enums begin with 0 and
  19  * increase by 1.
  20  *
  21  * We separate the IDs of Reset and Inherited structs so that we can use
  22  * the IDs as indices (offset by nsStyleStructID_*_Start) into arrays of
  23  * one type or the other.
  24  */
  25
  26 nsStyleStructID_Inherited_Start = 0,
  27 // a dummy value so the value after it is the same as ..._Inherited_Start
  28 nsStyleStructID_DUMMY1 = nsStyleStructID_Inherited_Start - 1,
  29
  30 #define STYLE_STRUCT_INHERITED(name, checkdata_cb) \
  31   eStyleStruct_##name,
  32 #define STYLE_STRUCT_RESET(name, checkdata_cb)
  33 #include "nsStyleStructList.h"
  34 #undef STYLE_STRUCT_INHERITED
  35 #undef STYLE_STRUCT_RESET
  36
  37 nsStyleStructID_Reset_Start,
  38 // a dummy value so the value after it is the same as ..._Reset_Start
  39 nsStyleStructID_DUMMY2 = nsStyleStructID_Reset_Start - 1,
  40
  41 #define STYLE_STRUCT_RESET(name, checkdata_cb) \
  42   eStyleStruct_##name,
  43 #define STYLE_STRUCT_INHERITED(name, checkdata_cb)
  44 #include "nsStyleStructList.h"
  45 #undef STYLE_STRUCT_INHERITED
  46 #undef STYLE_STRUCT_RESET
  47
  48 // one past the end; length of 0-based list
  49 nsStyleStructID_Length,
  50
  51 nsStyleStructID_Inherited_Count =
  52   nsStyleStructID_Reset_Start - nsStyleStructID_Inherited_Start,
  53 nsStyleStructID_Reset_Count =
  54   nsStyleStructID_Length - nsStyleStructID_Reset_Start,
  55
  56 // An ID used for properties that are not in style structs.  This is
  57 // used only in some users of nsStyleStructID, such as
  58 // nsCSSProps::kSIDTable, including some that store SIDs in a bitfield,
  59 // such as nsCSSCompressedDataBlock::mStyleBits.
  60 eStyleStruct_BackendOnly = nsStyleStructID_Length
  61
  62 };
  63
  64 // A bit corresponding to each struct ID
  65 #define NS_STYLE_INHERIT_BIT(sid_)        (1 << uint64_t(eStyleStruct_##sid_))
  66
  67 #endif /* nsStyleStructFwd_h_ */