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gecko-dev/gfx/thebes/gfxUserFontSet.h

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