forked from mirrors/gecko-dev
8d2808b5c9
Remove the need to post a runnable to coalesce them (we still coalesce theme changes because those do non-trivial work). What can go on is that on cold load we load the font list async, and that goes through this code via a faked font.internaluseonly.changed pref change, which stores a reframe change hint in mChangeHintForPrefChange. If the page flushes after this code runs, but before the next refresh driver tick, we will be just wasting work. So instead do the RebuildAllStyleData call synchronously. It just schedules a flush and posts a hint, so it doesn't do the work right there, but makes the next flush do the work as needed, so it should be faster and also more correct. Also improve handling of preference sheet prefs and such to avoid more wasted work when we go through this code, as the assumption their handling was doing was that it gets called infrequently, but it's not the case due to the font list updates. Differential Revision: https://phabricator.services.mozilla.com/D123103
141 lines
4.8 KiB
C++
141 lines
4.8 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_GlobalStyleSheetCache_h__
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#define mozilla_GlobalStyleSheetCache_h__
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#include "nsIMemoryReporter.h"
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#include "nsIObserver.h"
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#include "base/shared_memory.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/PreferenceSheet.h"
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#include "mozilla/NotNull.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/css/Loader.h"
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class nsIFile;
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class nsIURI;
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namespace mozilla {
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class CSSStyleSheet;
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} // namespace mozilla
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namespace mozilla {
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namespace css {
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// Enum defining how error should be handled.
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enum FailureAction { eCrash = 0, eLogToConsole };
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} // namespace css
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class GlobalStyleSheetCache final : public nsIObserver,
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public nsIMemoryReporter {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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NS_DECL_NSIMEMORYREPORTER
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static GlobalStyleSheetCache* Singleton();
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#define STYLE_SHEET(identifier_, url_, shared_) \
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NotNull<StyleSheet*> identifier_##Sheet();
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#include "mozilla/UserAgentStyleSheetList.h"
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#undef STYLE_SHEET
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StyleSheet* GetUserContentSheet();
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StyleSheet* GetUserChromeSheet();
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StyleSheet* ChromePreferenceSheet();
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StyleSheet* ContentPreferenceSheet();
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static void InvalidatePreferenceSheets();
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static bool AffectedByPref(const nsACString&);
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static void Shutdown();
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static void SetUserContentCSSURL(nsIURI* aURI);
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
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// Set the shared memory segment to load the shared UA sheets from.
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// Called early on in a content process' life from
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// ContentChild::InitSharedUASheets, before the GlobalStyleSheetCache
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// singleton has been created.
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static void SetSharedMemory(const base::SharedMemoryHandle& aHandle,
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uintptr_t aAddress);
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// Obtain a shared memory handle for the shared UA sheets to pass into a
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// content process. Called by ContentParent::InitInternal shortly after
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// a content process has been created.
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bool ShareToProcess(base::ProcessId aProcessId,
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base::SharedMemoryHandle* aHandle);
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// Returns the address of the shared memory segment that holds the shared UA
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// sheets.
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uintptr_t GetSharedMemoryAddress() {
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return sSharedMemory ? uintptr_t(sSharedMemory->memory()) : 0;
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}
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// Size of the shared memory buffer we'll create to store the shared UA
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// sheets. We choose a value that is big enough on both 64 bit and 32 bit.
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//
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// If this isn't big enough for the current contents of the shared UA
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// sheets, we'll crash under InitSharedSheetsInParent.
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static constexpr size_t kSharedMemorySize = 1024 * 450;
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private:
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// Shared memory header.
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struct Header {
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static constexpr uint32_t kMagic = 0x55415353;
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uint32_t mMagic; // Must be set to kMagic.
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const ServoCssRules* mSheets[size_t(UserAgentStyleSheetID::Count)];
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uint8_t mBuffer[1];
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};
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GlobalStyleSheetCache();
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~GlobalStyleSheetCache();
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void InitFromProfile();
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void InitSharedSheetsInParent();
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void InitMemoryReporter();
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RefPtr<StyleSheet> LoadSheetURL(const char* aURL,
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css::SheetParsingMode aParsingMode,
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css::FailureAction aFailureAction);
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RefPtr<StyleSheet> LoadSheetFile(nsIFile* aFile,
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css::SheetParsingMode aParsingMode);
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RefPtr<StyleSheet> LoadSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode,
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css::FailureAction aFailureAction);
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void LoadSheetFromSharedMemory(const char* aURL, RefPtr<StyleSheet>* aSheet,
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css::SheetParsingMode, Header*,
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UserAgentStyleSheetID);
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void BuildPreferenceSheet(RefPtr<StyleSheet>* aSheet,
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const PreferenceSheet::Prefs&);
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static StaticRefPtr<GlobalStyleSheetCache> gStyleCache;
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static StaticRefPtr<css::Loader> gCSSLoader;
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static StaticRefPtr<nsIURI> gUserContentSheetURL;
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#define STYLE_SHEET(identifier_, url_, shared_) \
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RefPtr<StyleSheet> m##identifier_##Sheet;
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#include "mozilla/UserAgentStyleSheetList.h"
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#undef STYLE_SHEET
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RefPtr<StyleSheet> mChromePreferenceSheet;
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RefPtr<StyleSheet> mContentPreferenceSheet;
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RefPtr<StyleSheet> mUserChromeSheet;
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RefPtr<StyleSheet> mUserContentSheet;
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// Shared memory segment storing shared style sheets.
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static StaticAutoPtr<base::SharedMemory> sSharedMemory;
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// How much of the shared memory buffer we ended up using. Used for memory
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// reporting in the parent process.
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static size_t sUsedSharedMemory;
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};
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} // namespace mozilla
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#endif
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