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c41d8342dd
Since font-language-override can only have a single three-letter tag, and it is eventually converted to uint32_t while creating gfxFontStyle, we should be able to move the conversion ahead, to an earlier stage. In this patch, we move the ParseFontLanguageOverride to nsRuleNode, so we could do the nsString-to-uint32_t conversion during computing time. MozReview-Commit-ID: LA4Bv3wV7K --HG-- extra : rebase_source : 48059a9913d58363f78dea59b1b7811d9f038352
705 lines
27 KiB
C++
705 lines
27 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 GFX_USER_FONT_SET_H
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#define GFX_USER_FONT_SET_H
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#include "gfxFont.h"
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#include "gfxFontFamilyList.h"
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#include "nsRefPtrHashtable.h"
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#include "nsCOMPtr.h"
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#include "nsIURI.h"
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#include "nsIPrincipal.h"
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#include "nsIScriptError.h"
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#include "nsURIHashKey.h"
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#include "mozilla/net/ReferrerPolicy.h"
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#include "gfxFontConstants.h"
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class nsFontFaceLoader;
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//#define DEBUG_USERFONT_CACHE
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class gfxFontFaceBufferSource
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{
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NS_INLINE_DECL_REFCOUNTING(gfxFontFaceBufferSource)
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public:
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virtual void TakeBuffer(uint8_t*& aBuffer, uint32_t& aLength) = 0;
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protected:
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virtual ~gfxFontFaceBufferSource() {}
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};
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// parsed CSS @font-face rule information
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// lifetime: from when @font-face rule processed until font is loaded
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struct gfxFontFaceSrc {
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enum SourceType {
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eSourceType_Local,
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eSourceType_URL,
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eSourceType_Buffer
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};
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SourceType mSourceType;
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// if url, whether to use the origin principal or not
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bool mUseOriginPrincipal;
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// format hint flags, union of all possible formats
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// (e.g. TrueType, EOT, SVG, etc.)
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// see FLAG_FORMAT_* enum values below
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uint32_t mFormatFlags;
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nsString mLocalName; // full font name if local
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nsCOMPtr<nsIURI> mURI; // uri if url
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nsCOMPtr<nsIURI> mReferrer; // referrer url if url
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mozilla::net::ReferrerPolicy mReferrerPolicy;
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nsCOMPtr<nsIPrincipal> mOriginPrincipal; // principal if url
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RefPtr<gfxFontFaceBufferSource> mBuffer;
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};
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inline bool
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operator==(const gfxFontFaceSrc& a, const gfxFontFaceSrc& b)
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{
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if (a.mSourceType != b.mSourceType) {
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return false;
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}
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switch (a.mSourceType) {
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case gfxFontFaceSrc::eSourceType_Local:
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return a.mLocalName == b.mLocalName;
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case gfxFontFaceSrc::eSourceType_URL: {
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bool equals;
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return a.mUseOriginPrincipal == b.mUseOriginPrincipal &&
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a.mFormatFlags == b.mFormatFlags &&
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NS_SUCCEEDED(a.mURI->Equals(b.mURI, &equals)) && equals &&
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NS_SUCCEEDED(a.mReferrer->Equals(b.mReferrer, &equals)) &&
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equals &&
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a.mReferrerPolicy == b.mReferrerPolicy &&
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a.mOriginPrincipal->Equals(b.mOriginPrincipal);
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}
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case gfxFontFaceSrc::eSourceType_Buffer:
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return a.mBuffer == b.mBuffer;
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}
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NS_WARNING("unexpected mSourceType");
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return false;
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}
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// Subclassed to store platform-specific code cleaned out when font entry is
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// deleted.
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// Lifetime: from when platform font is created until it is deactivated.
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// If the platform does not need to add any platform-specific code/data here,
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// then the gfxUserFontSet will allocate a base gfxUserFontData and attach
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// to the entry to track the basic user font info fields here.
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class gfxUserFontData {
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public:
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gfxUserFontData()
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: mSrcIndex(0), mFormat(0), mMetaOrigLen(0),
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mCRC32(0), mLength(0), mCompression(kUnknownCompression),
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mPrivate(false), mIsBuffer(false)
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{ }
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virtual ~gfxUserFontData() { }
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
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nsTArray<uint8_t> mMetadata; // woff metadata block (compressed), if any
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nsCOMPtr<nsIURI> mURI; // URI of the source, if it was url()
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nsCOMPtr<nsIPrincipal> mPrincipal; // principal for the download, if url()
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nsString mLocalName; // font name used for the source, if local()
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nsString mRealName; // original fullname from the font resource
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uint32_t mSrcIndex; // index in the rule's source list
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uint32_t mFormat; // format hint for the source used, if any
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uint32_t mMetaOrigLen; // length needed to decompress metadata
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uint32_t mCRC32; // Checksum
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uint32_t mLength; // Font length
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uint8_t mCompression; // compression type
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bool mPrivate; // whether font belongs to a private window
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bool mIsBuffer; // whether the font source was a buffer
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enum {
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kUnknownCompression = 0,
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kZlibCompression = 1,
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kBrotliCompression = 2
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};
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};
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// initially contains a set of userfont font entry objects, replaced with
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// platform/user fonts as downloaded
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class gfxUserFontFamily : public gfxFontFamily {
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public:
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friend class gfxUserFontSet;
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explicit gfxUserFontFamily(const nsAString& aName)
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: gfxFontFamily(aName) { }
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virtual ~gfxUserFontFamily() { }
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// add the given font entry to the end of the family's list
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void AddFontEntry(gfxFontEntry* aFontEntry) {
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// keep ref while removing existing entry
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RefPtr<gfxFontEntry> fe = aFontEntry;
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// remove existing entry, if already present
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mAvailableFonts.RemoveElement(aFontEntry);
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// insert at the beginning so that the last-defined font is the first
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// one in the fontlist used for matching, as per CSS Fonts spec
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mAvailableFonts.InsertElementAt(0, aFontEntry);
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if (aFontEntry->mFamilyName.IsEmpty()) {
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aFontEntry->mFamilyName = Name();
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} else {
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#ifdef DEBUG
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nsString thisName = Name();
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nsString entryName = aFontEntry->mFamilyName;
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ToLowerCase(thisName);
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ToLowerCase(entryName);
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MOZ_ASSERT(thisName.Equals(entryName));
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#endif
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}
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ResetCharacterMap();
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}
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// Remove all font entries from the family
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void DetachFontEntries() {
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mAvailableFonts.Clear();
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}
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};
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class gfxUserFontEntry;
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class gfxOTSContext;
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class gfxUserFontSet {
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friend class gfxUserFontEntry;
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friend class gfxOTSContext;
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public:
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NS_INLINE_DECL_REFCOUNTING(gfxUserFontSet)
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gfxUserFontSet();
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enum {
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// no flags ==> no hint set
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// unknown ==> unknown format hint set
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FLAG_FORMAT_UNKNOWN = 1,
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FLAG_FORMAT_OPENTYPE = 1 << 1,
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FLAG_FORMAT_TRUETYPE = 1 << 2,
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FLAG_FORMAT_TRUETYPE_AAT = 1 << 3,
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FLAG_FORMAT_EOT = 1 << 4,
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FLAG_FORMAT_SVG = 1 << 5,
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FLAG_FORMAT_WOFF = 1 << 6,
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FLAG_FORMAT_WOFF2 = 1 << 7,
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// the common formats that we support everywhere
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FLAG_FORMATS_COMMON = FLAG_FORMAT_OPENTYPE |
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FLAG_FORMAT_TRUETYPE |
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FLAG_FORMAT_WOFF |
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FLAG_FORMAT_WOFF2,
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// mask of all unused bits, update when adding new formats
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FLAG_FORMAT_NOT_USED = ~((1 << 8)-1)
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};
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// creates a font face without adding it to a particular family
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// weight - [100, 900] (multiples of 100)
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// stretch = [NS_FONT_STRETCH_ULTRA_CONDENSED, NS_FONT_STRETCH_ULTRA_EXPANDED]
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// italic style = constants in gfxFontConstants.h, e.g. NS_FONT_STYLE_NORMAL
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// language override = result of calling nsRuleNode::ParseFontLanguageOverride
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// TODO: support for unicode ranges not yet implemented
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virtual already_AddRefed<gfxUserFontEntry> CreateUserFontEntry(
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges,
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uint8_t aFontDisplay) = 0;
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// creates a font face for the specified family, or returns an existing
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// matching entry on the family if there is one
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already_AddRefed<gfxUserFontEntry> FindOrCreateUserFontEntry(
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const nsAString& aFamilyName,
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges,
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uint8_t aFontDisplay);
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// add in a font face for which we have the gfxUserFontEntry already
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void AddUserFontEntry(const nsAString& aFamilyName,
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gfxUserFontEntry* aUserFontEntry);
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// Whether there is a face with this family name
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bool HasFamily(const nsAString& aFamilyName) const
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{
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return LookupFamily(aFamilyName) != nullptr;
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}
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// Look up and return the gfxUserFontFamily in mFontFamilies with
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// the given name
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gfxUserFontFamily* LookupFamily(const nsAString& aName) const;
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// Look up names in a fontlist and return true if any are in the set
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bool ContainsUserFontSetFonts(const mozilla::FontFamilyList& aFontList) const;
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// check whether the given source is allowed to be loaded;
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// returns the Principal (for use in the key when caching the loaded font),
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// and whether the load should bypass the cache (force-reload).
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virtual nsresult CheckFontLoad(const gfxFontFaceSrc* aFontFaceSrc,
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nsIPrincipal** aPrincipal,
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bool* aBypassCache) = 0;
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// check whether content policies allow the given URI to load.
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virtual bool IsFontLoadAllowed(nsIURI* aFontLocation,
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nsIPrincipal* aPrincipal) = 0;
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// initialize the process that loads external font data, which upon
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// completion will call FontDataDownloadComplete method
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virtual nsresult StartLoad(gfxUserFontEntry* aUserFontEntry,
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const gfxFontFaceSrc* aFontFaceSrc) = 0;
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// generation - each time a face is loaded, generation is
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// incremented so that the change can be recognized
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uint64_t GetGeneration() { return mGeneration; }
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// increment the generation on font load
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void IncrementGeneration(bool aIsRebuild = false);
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// Generation is bumped on font loads but that doesn't affect name-style
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// mappings. Rebuilds do however affect name-style mappings so need to
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// lookup fontlists again when that happens.
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uint64_t GetRebuildGeneration() { return mRebuildGeneration; }
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// rebuild if local rules have been used
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void RebuildLocalRules();
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class UserFontCache {
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public:
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// Flag passed when caching a font entry, to specify whether the entry
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// should persist in the cache or be discardable.
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typedef enum {
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kDiscardable,
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kPersistent
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} EntryPersistence;
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// Record a loaded user-font in the cache. This requires that the
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// font-entry's userFontData has been set up already, as it relies
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// on the URI and Principal recorded there.
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// If aPersistence is Persistent, the entry will remain in the cache
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// across cacheservice:empty-cache notifications. This is used for
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// "preloaded hidden fonts" on FxOS.
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static void CacheFont(gfxFontEntry* aFontEntry,
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EntryPersistence aPersistence = kDiscardable);
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// The given gfxFontEntry is being destroyed, so remove any record that
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// refers to it.
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static void ForgetFont(gfxFontEntry* aFontEntry);
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// Return the gfxFontEntry corresponding to a given URI and principal,
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// and the features of the given userfont entry, or nullptr if none is available.
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// The aPrivate flag is set for requests coming from private windows,
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// so we can avoid leaking fonts cached in private windows mode out to
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// normal windows.
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static gfxFontEntry* GetFont(nsIURI* aSrcURI,
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nsIPrincipal* aPrincipal,
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gfxUserFontEntry* aUserFontEntry,
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bool aPrivate);
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// Clear everything so that we don't leak URIs and Principals.
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static void Shutdown();
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// Memory-reporting support.
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class MemoryReporter final : public nsIMemoryReporter
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{
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private:
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~MemoryReporter() { }
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIMEMORYREPORTER
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};
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#ifdef DEBUG_USERFONT_CACHE
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// dump contents
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static void Dump();
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#endif
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private:
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// Helper that we use to observe the empty-cache notification
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// from nsICacheService.
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class Flusher : public nsIObserver
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{
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virtual ~Flusher() {}
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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Flusher() {}
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};
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// Key used to look up entries in the user-font cache.
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// Note that key comparison does *not* use the mFontEntry field
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// as a whole; it only compares specific fields within the entry
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// (weight/width/style/features) that could affect font selection
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// or rendering, and that must match between a font-set's userfont
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// entry and the corresponding "real" font entry.
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struct Key {
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nsCOMPtr<nsIURI> mURI;
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nsCOMPtr<nsIPrincipal> mPrincipal; // use nullptr with data: URLs
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// The font entry MUST notify the cache when it is destroyed
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// (by calling ForgetFont()).
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gfxFontEntry* MOZ_NON_OWNING_REF mFontEntry;
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uint32_t mCRC32;
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uint32_t mLength;
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bool mPrivate;
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EntryPersistence mPersistence;
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Key(nsIURI* aURI, nsIPrincipal* aPrincipal,
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gfxFontEntry* aFontEntry, bool aPrivate,
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EntryPersistence aPersistence = kDiscardable)
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: mURI(aURI),
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mPrincipal(aPrincipal),
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mFontEntry(aFontEntry),
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mCRC32(0),
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mLength(0),
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mPrivate(aPrivate),
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mPersistence(aPersistence)
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{ }
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Key(uint32_t aCRC32, uint32_t aLength,
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gfxFontEntry* aFontEntry, bool aPrivate,
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EntryPersistence aPersistence = kDiscardable)
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: mURI(nullptr),
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mPrincipal(nullptr),
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mFontEntry(aFontEntry),
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mCRC32(aCRC32),
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mLength(aLength),
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mPrivate(aPrivate),
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mPersistence(aPersistence)
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{ }
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};
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class Entry : public PLDHashEntryHdr {
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public:
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typedef const Key& KeyType;
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typedef const Key* KeyTypePointer;
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explicit Entry(KeyTypePointer aKey)
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: mURI(aKey->mURI),
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mPrincipal(aKey->mPrincipal),
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mCRC32(aKey->mCRC32),
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mLength(aKey->mLength),
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mFontEntry(aKey->mFontEntry),
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mPrivate(aKey->mPrivate),
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mPersistence(aKey->mPersistence)
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{ }
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Entry(const Entry& aOther)
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: mURI(aOther.mURI),
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mPrincipal(aOther.mPrincipal),
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mCRC32(aOther.mCRC32),
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mLength(aOther.mLength),
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mFontEntry(aOther.mFontEntry),
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mPrivate(aOther.mPrivate),
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mPersistence(aOther.mPersistence)
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{ }
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~Entry() { }
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bool KeyEquals(const KeyTypePointer aKey) const;
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static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
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static PLDHashNumber HashKey(const KeyTypePointer aKey) {
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if (aKey->mLength) {
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return aKey->mCRC32;
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}
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uint32_t principalHash = 0;
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if (aKey->mPrincipal) {
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aKey->mPrincipal->GetHashValue(&principalHash);
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}
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return mozilla::HashGeneric(principalHash + int(aKey->mPrivate),
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nsURIHashKey::HashKey(aKey->mURI),
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HashFeatures(aKey->mFontEntry->mFeatureSettings),
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mozilla::HashString(aKey->mFontEntry->mFamilyName),
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(aKey->mFontEntry->mStyle |
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(aKey->mFontEntry->mWeight << 2) |
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(aKey->mFontEntry->mStretch << 11) ) ^
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aKey->mFontEntry->mLanguageOverride);
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}
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enum { ALLOW_MEMMOVE = false };
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gfxFontEntry* GetFontEntry() const { return mFontEntry; }
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bool IsPersistent() const { return mPersistence == kPersistent; }
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bool IsPrivate() const { return mPrivate; }
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void ReportMemory(nsIHandleReportCallback* aHandleReport,
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nsISupports* aData, bool aAnonymize);
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#ifdef DEBUG_USERFONT_CACHE
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void Dump();
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#endif
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private:
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static uint32_t
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HashFeatures(const nsTArray<gfxFontFeature>& aFeatures) {
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return mozilla::HashBytes(aFeatures.Elements(),
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aFeatures.Length() * sizeof(gfxFontFeature));
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}
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nsCOMPtr<nsIURI> mURI;
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nsCOMPtr<nsIPrincipal> mPrincipal; // or nullptr for data: URLs
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uint32_t mCRC32;
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uint32_t mLength;
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// The "real" font entry corresponding to this downloaded font.
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// The font entry MUST notify the cache when it is destroyed
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// (by calling ForgetFont()).
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gfxFontEntry* MOZ_NON_OWNING_REF mFontEntry;
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// Whether this font was loaded from a private window.
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bool mPrivate;
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// Whether this entry should survive cache-flushing.
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EntryPersistence mPersistence;
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};
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static nsTHashtable<Entry>* sUserFonts;
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};
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void SetLocalRulesUsed() {
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mLocalRulesUsed = true;
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}
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static mozilla::LogModule* GetUserFontsLog();
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// record statistics about font completion
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virtual void RecordFontLoadDone(uint32_t aFontSize,
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mozilla::TimeStamp aDoneTime) {}
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void GetLoadStatistics(uint32_t& aLoadCount, uint64_t& aLoadSize) const {
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aLoadCount = mDownloadCount;
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aLoadSize = mDownloadSize;
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}
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protected:
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// Protected destructor, to discourage deletion outside of Release():
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virtual ~gfxUserFontSet();
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// Return whether the font set is associated with a private-browsing tab.
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virtual bool GetPrivateBrowsing() = 0;
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// parse data for a data URL
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virtual nsresult SyncLoadFontData(gfxUserFontEntry* aFontToLoad,
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const gfxFontFaceSrc* aFontFaceSrc,
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uint8_t* &aBuffer,
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uint32_t &aBufferLength) = 0;
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// report a problem of some kind (implemented in nsUserFontSet)
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virtual nsresult LogMessage(gfxUserFontEntry* aUserFontEntry,
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const char* aMessage,
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uint32_t aFlags = nsIScriptError::errorFlag,
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nsresult aStatus = NS_OK) = 0;
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// helper method for performing the actual userfont set rebuild
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virtual void DoRebuildUserFontSet() = 0;
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// helper method for FindOrCreateUserFontEntry
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gfxUserFontEntry* FindExistingUserFontEntry(
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gfxUserFontFamily* aFamily,
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges,
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uint8_t aFontDisplay);
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// creates a new gfxUserFontFamily in mFontFamilies, or returns an existing
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// family if there is one
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gfxUserFontFamily* GetFamily(const nsAString& aFamilyName);
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// font families defined by @font-face rules
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nsRefPtrHashtable<nsStringHashKey, gfxUserFontFamily> mFontFamilies;
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uint64_t mGeneration; // bumped on any font load change
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uint64_t mRebuildGeneration; // only bumped on rebuilds
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// true when local names have been looked up, false otherwise
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bool mLocalRulesUsed;
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// true when rules using local names need to be redone
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bool mRebuildLocalRules;
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// performance stats
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uint32_t mDownloadCount;
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uint64_t mDownloadSize;
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};
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// acts a placeholder until the real font is downloaded
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class gfxUserFontEntry : public gfxFontEntry {
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friend class gfxUserFontSet;
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friend class nsUserFontSet;
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friend class nsFontFaceLoader;
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friend class gfxOTSContext;
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public:
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enum UserFontLoadState {
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STATUS_NOT_LOADED = 0,
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STATUS_LOADING,
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STATUS_LOADED,
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STATUS_FAILED
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};
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gfxUserFontEntry(gfxUserFontSet* aFontSet,
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges,
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uint8_t aFontDisplay);
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virtual ~gfxUserFontEntry();
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// Return whether the entry matches the given list of attributes
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bool Matches(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint8_t aStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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uint32_t aLanguageOverride,
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gfxSparseBitSet* aUnicodeRanges,
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uint8_t aFontDisplay);
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virtual gfxFont* CreateFontInstance(const gfxFontStyle* aFontStyle,
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bool aNeedsBold);
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gfxFontEntry* GetPlatformFontEntry() const { return mPlatformFontEntry; }
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// is the font loading or loaded, or did it fail?
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UserFontLoadState LoadState() const { return mUserFontLoadState; }
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// whether to wait before using fallback font or not
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bool WaitForUserFont() const {
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return mUserFontLoadState == STATUS_LOADING &&
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mFontDataLoadingState < LOADING_SLOWLY;
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}
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// for userfonts, cmap is used to store the unicode range data
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// no cmap ==> all codepoints permitted
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bool CharacterInUnicodeRange(uint32_t ch) const {
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if (mCharacterMap) {
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return mCharacterMap->test(ch);
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}
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return true;
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}
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gfxCharacterMap* GetUnicodeRangeMap() const {
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return mCharacterMap.get();
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}
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uint8_t GetFontDisplay() const { return mFontDisplay; }
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// load the font - starts the loading of sources which continues until
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// a valid font resource is found or all sources fail
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void Load();
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// methods to expose some information to FontFaceSet::UserFontSet
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// since we can't make that class a friend
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void SetLoader(nsFontFaceLoader* aLoader) { mLoader = aLoader; }
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nsFontFaceLoader* GetLoader() { return mLoader; }
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nsIPrincipal* GetPrincipal() { return mPrincipal; }
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uint32_t GetSrcIndex() { return mSrcIndex; }
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void GetFamilyNameAndURIForLogging(nsACString& aFamilyName,
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nsACString& aURI);
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protected:
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const uint8_t* SanitizeOpenTypeData(const uint8_t* aData,
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uint32_t aLength,
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uint32_t& aSaneLength,
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gfxUserFontType aFontType);
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// attempt to load the next resource in the src list.
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void LoadNextSrc();
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// change the load state
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virtual void SetLoadState(UserFontLoadState aLoadState);
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// when download has been completed, pass back data here
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// aDownloadStatus == NS_OK ==> download succeeded, error otherwise
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// returns true if platform font creation sucessful (or local()
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// reference was next in line)
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// Ownership of aFontData is passed in here; the font set must
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// ensure that it is eventually deleted with free().
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bool FontDataDownloadComplete(const uint8_t* aFontData, uint32_t aLength,
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nsresult aDownloadStatus);
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// helper method for creating a platform font
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// returns true if platform font creation successful
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// Ownership of aFontData is passed in here; the font must
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// ensure that it is eventually deleted with free().
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bool LoadPlatformFont(const uint8_t* aFontData, uint32_t& aLength);
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// store metadata and src details for current src into aFontEntry
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void StoreUserFontData(gfxFontEntry* aFontEntry,
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bool aPrivate,
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const nsAString& aOriginalName,
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FallibleTArray<uint8_t>* aMetadata,
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uint32_t aMetaOrigLen,
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uint8_t aCompression);
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// Clears and then adds to aResult all of the user font sets that this user
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// font entry has been added to. This will at least include mFontSet, the
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// owner of this user font entry.
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virtual void GetUserFontSets(nsTArray<gfxUserFontSet*>& aResult);
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// Calls IncrementGeneration() on all user font sets that contain this
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// user font entry.
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void IncrementGeneration();
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// general load state
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UserFontLoadState mUserFontLoadState;
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// detailed load state while font data is loading
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// used to determine whether to use fallback font or not
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// note that code depends on the ordering of these values!
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enum FontDataLoadingState {
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NOT_LOADING = 0, // not started to load any font resources yet
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LOADING_STARTED, // loading has started; hide fallback font
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LOADING_ALMOST_DONE, // timeout happened but we're nearly done,
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// so keep hiding fallback font
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LOADING_SLOWLY, // timeout happened and we're not nearly done,
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// so use the fallback font
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LOADING_TIMED_OUT, // font load took too long
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LOADING_FAILED // failed to load any source: use fallback
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};
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FontDataLoadingState mFontDataLoadingState;
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bool mUnsupportedFormat;
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uint8_t mFontDisplay; // timing of userfont fallback
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RefPtr<gfxFontEntry> mPlatformFontEntry;
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nsTArray<gfxFontFaceSrc> mSrcList;
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uint32_t mSrcIndex; // index of loading src item
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// This field is managed by the nsFontFaceLoader. In the destructor and Cancel()
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// methods of nsFontFaceLoader this reference is nulled out.
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nsFontFaceLoader* MOZ_NON_OWNING_REF mLoader; // current loader for this entry, if any
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gfxUserFontSet* mFontSet; // font-set which owns this userfont entry
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nsCOMPtr<nsIPrincipal> mPrincipal;
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};
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#endif /* GFX_USER_FONT_SET_H */
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