nsStyleStructFwd.h (2024B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 /* 8 * Forward declarations to avoid including all of nsStyleStruct.h. 9 */ 10 11 #ifndef nsStyleStructFwd_h_ 12 #define nsStyleStructFwd_h_ 13 14 #include "nsStyleStructList.h" 15 16 namespace mozilla { 17 18 enum class StyleStructID : uint32_t { 19 /* 20 * Define the constants eStyleStruct_Font, etc. 21 * 22 * The C++ standard, section 7.2, guarantees that enums begin with 0 and 23 * increase by 1. 24 * 25 * Note that we rely on the inherited structs being before the rest in 26 * ComputedStyle. 27 */ 28 #define ENUM_ENTRY(name) name, 29 FOR_EACH_STYLE_STRUCT(ENUM_ENTRY, ENUM_ENTRY) 30 #undef ENUM_ENTRY 31 }; 32 33 struct StyleStructConstants { 34 static const uint32_t kStyleStructCount = 35 #define COUNT_STRUCT(name) 1 + 36 FOR_EACH_STYLE_STRUCT(COUNT_STRUCT, COUNT_STRUCT) 37 #undef COUNT_STRUCT 38 0; 39 40 static const uint32_t kInheritedStyleStructCount = 41 #define COUNT_INHERITED(name) 1 + 42 #define COUNT_RESET(name) 43 FOR_EACH_STYLE_STRUCT(COUNT_INHERITED, COUNT_RESET) 44 #undef COUNT_INHERITED 45 #undef COUNT_RESET 46 0; 47 48 static const uint32_t kResetStyleStructCount = 49 #define COUNT_INHERITED(name) 50 #define COUNT_RESET(name) 1 + 51 FOR_EACH_STYLE_STRUCT(COUNT_INHERITED, COUNT_RESET) 52 #undef COUNT_INHERITED 53 #undef COUNT_RESET 54 0; 55 56 static_assert(kStyleStructCount <= 32, "Bitmasks must be bigger!"); 57 58 static const uint32_t kAllStructsMask = (1 << kStyleStructCount) - 1; 59 static const uint32_t kInheritedStructsMask = 60 (1 << kInheritedStyleStructCount) - 1; 61 static const uint32_t kResetStructsMask = 62 kAllStructsMask & (~kInheritedStructsMask); 63 64 static uint32_t BitFor(StyleStructID aID) { 65 return 1 << static_cast<uint32_t>(aID); 66 } 67 }; 68 69 } // namespace mozilla 70 71 #endif /* nsStyleStructFwd_h_ */