forked from mirrors/gecko-dev
265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ServoComputedData_h
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#define mozilla_ServoComputedData_h
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class nsWindowSizes;
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/*
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* ServoComputedData and its related types.
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*/
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#define STYLE_STRUCT(name_) struct nsStyle##name_;
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT
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namespace mozilla {
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template <typename T>
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struct ServoRawOffsetArc {
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// This is a pointer to a T that lives inside a servo_arc::Arc<T>, and
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// which already has had its reference count incremented.
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T* mPtr;
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};
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struct ServoWritingMode {
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uint8_t mBits;
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};
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struct ServoCustomPropertiesMap {
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uintptr_t mPtr;
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};
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struct ServoRuleNode {
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uintptr_t mPtr;
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};
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class ComputedStyle;
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struct ServoVisitedStyle {
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// This is actually a strong reference but ServoComputedData's
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// destructor is managed by the Rust code so we just use a regular
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// pointer
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ComputedStyle* mPtr;
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};
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struct ServoComputedValueFlags {
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uint16_t mFlags;
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};
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#define STYLE_STRUCT(name_) struct Gecko##name_;
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT
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} // namespace mozilla
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class ServoComputedData;
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struct ServoComputedDataForgotten {
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// Make sure you manually mem::forget the backing ServoComputedData
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// after calling this
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explicit ServoComputedDataForgotten(const ServoComputedData* aValue)
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: mPtr(aValue) {}
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const ServoComputedData* mPtr;
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};
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/**
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* We want C++ to be able to read the style struct fields of ComputedValues
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* so we define this type on the C++ side and use the bindgenned version
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* on the Rust side.
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*/
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class ServoComputedData {
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friend class mozilla::ComputedStyle;
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public:
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// Constructs via memcpy. Will not move out of aValue.
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explicit ServoComputedData(const ServoComputedDataForgotten aValue);
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#define STYLE_STRUCT(name_) \
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mozilla::ServoRawOffsetArc<mozilla::Gecko##name_> name_; \
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inline const nsStyle##name_* GetStyle##name_() const;
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT
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void AddSizeOfExcludingThis(nsWindowSizes& aSizes) const;
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private:
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mozilla::ServoCustomPropertiesMap custom_properties;
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mozilla::ServoWritingMode writing_mode;
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mozilla::ServoComputedValueFlags flags;
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/// The rule node representing the ordered list of rules matched for this
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/// node. Can be None for default values and text nodes. This is
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/// essentially an optimization to avoid referencing the root rule node.
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mozilla::ServoRuleNode rules;
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/// The element's computed values if visited, only computed if there's a
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/// relevant link for this element. A element's "relevant link" is the
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/// element being matched if it is a link or the nearest ancestor link.
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mozilla::ServoVisitedStyle visited_style;
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// C++ just sees this struct as a bucket of bits, and will
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// do the wrong thing if we let it use the default copy ctor/assignment
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// operator. Remove them so that there is no footgun.
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//
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// We remove the move ctor/assignment operator as well, because
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// moves in C++ don't prevent destructors from being called,
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// which will lead to double frees.
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ServoComputedData& operator=(const ServoComputedData&) = delete;
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ServoComputedData(const ServoComputedData&) = delete;
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ServoComputedData&& operator=(const ServoComputedData&&) = delete;
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ServoComputedData(const ServoComputedData&&) = delete;
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};
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#endif // mozilla_ServoComputedData_h
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