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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 14:29:10 +0000 |
commit | 2aa4a82499d4becd2284cdb482213d541b8804dd (patch) | |
tree | b80bf8bf13c3766139fbacc530efd0dd9d54394c /layout/style/ServoComputedData.h | |
parent | Initial commit. (diff) | |
download | firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz firefox-2aa4a82499d4becd2284cdb482213d541b8804dd.zip |
Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/style/ServoComputedData.h')
-rw-r--r-- | layout/style/ServoComputedData.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/layout/style/ServoComputedData.h b/layout/style/ServoComputedData.h new file mode 100644 index 0000000000..cc01e5d01e --- /dev/null +++ b/layout/style/ServoComputedData.h @@ -0,0 +1,125 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_ServoComputedData_h +#define mozilla_ServoComputedData_h + +class nsWindowSizes; + +#include "mozilla/ServoStyleConsts.h" + +/* + * ServoComputedData and its related types. + */ + +#define STYLE_STRUCT(name_) struct nsStyle##name_; +#include "nsStyleStructList.h" +#undef STYLE_STRUCT + +namespace mozilla { + +template <typename T> +struct ServoRawOffsetArc { + // This is a pointer to a T that lives inside a servo_arc::Arc<T>, and + // which already has had its reference count incremented. + T* mPtr; +}; + +// A wrapper that gets replaced by ManuallyDrop<T> by bindgen. +// +// NOTE(emilio): All this file is a bit gross, and most of this we make cleaner +// using cbindgen and such. +template <typename T> +struct ServoManuallyDrop { + T mInner; +}; + +struct ServoWritingMode { + uint8_t mBits; +}; + +struct ServoCustomPropertiesMap { + uintptr_t mPtr; +}; + +struct ServoRuleNode { + uintptr_t mPtr; +}; + +class ComputedStyle; + +struct ServoVisitedStyle { + // This is actually a strong reference but ServoComputedData's + // destructor is managed by the Rust code so we just use a regular + // pointer + ComputedStyle* mPtr; +}; + +#define STYLE_STRUCT(name_) struct Gecko##name_; +#include "nsStyleStructList.h" +#undef STYLE_STRUCT + +} // namespace mozilla + +class ServoComputedData; + +struct ServoComputedDataForgotten { + // Make sure you manually mem::forget the backing ServoComputedData + // after calling this + explicit ServoComputedDataForgotten(const ServoComputedData* aValue) + : mPtr(aValue) {} + const ServoComputedData* mPtr; +}; + +/** + * We want C++ to be able to read the style struct fields of ComputedValues + * so we define this type on the C++ side and use the bindgenned version + * on the Rust side. + */ +class ServoComputedData { + friend class mozilla::ComputedStyle; + + public: + // Constructs via memcpy. Will not move out of aValue. + explicit ServoComputedData(const ServoComputedDataForgotten aValue); + +#define STYLE_STRUCT(name_) \ + mozilla::ServoRawOffsetArc<mozilla::Gecko##name_> name_; \ + inline const nsStyle##name_* GetStyle##name_() const; +#include "nsStyleStructList.h" +#undef STYLE_STRUCT + + void AddSizeOfExcludingThis(nsWindowSizes& aSizes) const; + + mozilla::ServoWritingMode WritingMode() const { return writing_mode; } + + private: + mozilla::ServoCustomPropertiesMap custom_properties; + mozilla::ServoWritingMode writing_mode; + mozilla::StyleComputedValueFlags flags; + /// The rule node representing the ordered list of rules matched for this + /// node. Can be None for default values and text nodes. This is + /// essentially an optimization to avoid referencing the root rule node. + mozilla::ServoRuleNode rules; + /// The element's computed values if visited, only computed if there's a + /// relevant link for this element. A element's "relevant link" is the + /// element being matched if it is a link or the nearest ancestor link. + mozilla::ServoVisitedStyle visited_style; + + // C++ just sees this struct as a bucket of bits, and will + // do the wrong thing if we let it use the default copy ctor/assignment + // operator. Remove them so that there is no footgun. + // + // We remove the move ctor/assignment operator as well, because + // moves in C++ don't prevent destructors from being called, + // which will lead to double frees. + ServoComputedData& operator=(const ServoComputedData&) = delete; + ServoComputedData(const ServoComputedData&) = delete; + ServoComputedData&& operator=(const ServoComputedData&&) = delete; + ServoComputedData(const ServoComputedData&&) = delete; +}; + +#endif // mozilla_ServoComputedData_h |