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dad3a20b22
This is more consistent with what the Rust bits of the style system do, and removes a pointer from ComputedStyle which is always nice. This also aligns the Rust bits with the C++ bits re. not treating xul pseudos as anonymous boxes. See the comment in nsTreeStyleCache.cpp regarding those. Can't wait for XUL trees to die. Depends on D19001 Differential Revision: https://phabricator.services.mozilla.com/D19002 --HG-- extra : moz-landing-system : lando
67 lines
1.9 KiB
C++
67 lines
1.9 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_CachedInheritingStyles_h
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#define mozilla_CachedInheritingStyles_h
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#include "nsAtom.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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class nsWindowSizes;
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namespace mozilla {
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enum class PseudoStyleType : uint8_t;
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class ComputedStyle;
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// Cache of anonymous box and lazy pseudo styles that inherit from a given
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// style.
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//
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// To minimize memory footprint, the cache is word-sized with a tagged pointer
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// If there is only one entry, it's stored inline. If there are more, they're
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// stored in an out-of-line buffer. See bug 1429126 comment 0 and comment 1 for
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// the measurements and rationale that influenced the design.
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class CachedInheritingStyles {
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public:
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void Insert(ComputedStyle* aStyle);
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ComputedStyle* Lookup(PseudoStyleType) const;
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CachedInheritingStyles() : mBits(0) {}
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~CachedInheritingStyles() {
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if (IsIndirect()) {
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delete AsIndirect();
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} else if (!IsEmpty()) {
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RefPtr<ComputedStyle> ref = dont_AddRef(AsDirect());
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}
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}
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void AddSizeOfIncludingThis(nsWindowSizes& aSizes, size_t* aCVsSize) const;
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private:
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// See bug 1429126 comment 1 for the choice of four here.
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typedef AutoTArray<RefPtr<ComputedStyle>, 4> IndirectCache;
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bool IsEmpty() const { return !mBits; }
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bool IsIndirect() const { return (mBits & 1); }
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ComputedStyle* AsDirect() const {
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MOZ_ASSERT(!IsIndirect());
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return reinterpret_cast<ComputedStyle*>(mBits);
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}
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IndirectCache* AsIndirect() const {
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MOZ_ASSERT(IsIndirect());
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return reinterpret_cast<IndirectCache*>(mBits & ~1);
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}
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uintptr_t mBits;
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};
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} // namespace mozilla
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#endif // mozilla_CachedInheritingStyles_h
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