mirror of
https://github.com/mozilla/gecko-dev.git
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4b12513f89
It seems like the sizes for these data structures can be controlled from Web content, and we are already prepared to deal with OOM conditions, except that we are using infallible allocations by mistake.
481 lines
19 KiB
C++
481 lines
19 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 "nsRefPtrHashtable.h"
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#include "nsAutoPtr.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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class nsFontFaceLoader;
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//#define DEBUG_USERFONT_CACHE
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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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bool mIsLocal; // url or local
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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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nsCOMPtr<nsIPrincipal> mOriginPrincipal; // principal if url
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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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bool equals;
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return (a.mIsLocal && b.mIsLocal &&
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a.mLocalName == b.mLocalName) ||
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(!a.mIsLocal && !b.mIsLocal &&
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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)) && equals &&
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a.mOriginPrincipal->Equals(b.mOriginPrincipal));
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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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{ }
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virtual ~gfxUserFontData() { }
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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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bool mPrivate; // whether font belongs to a private window
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};
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// initially contains a set of proxy font entry objects, replaced with
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// platform/user fonts as downloaded
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class gfxMixedFontFamily : public gfxFontFamily {
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public:
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friend class gfxUserFontSet;
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gfxMixedFontFamily(const nsAString& aName)
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: gfxFontFamily(aName) { }
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virtual ~gfxMixedFontFamily() { }
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// Add the given font entry to the end of the family's list.
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// Any earlier occurrence is removed, so this has the effect of "advancing"
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// the entry to the end of the list.
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void AddFontEntry(gfxFontEntry *aFontEntry) {
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// We append to mAvailableFonts -before- searching for and removing
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// any existing reference to avoid the risk that we'll remove the last
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// reference to the font entry, and thus delete it.
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mAvailableFonts.AppendElement(aFontEntry);
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uint32_t i = mAvailableFonts.Length() - 1;
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while (i > 0) {
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if (mAvailableFonts[--i] == aFontEntry) {
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mAvailableFonts.RemoveElementAt(i);
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break;
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}
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}
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aFontEntry->mFamilyName = Name();
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ResetCharacterMap();
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}
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// Replace aProxyFontEntry in the family's list with aRealFontEntry.
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void ReplaceFontEntry(gfxFontEntry *aProxyFontEntry,
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gfxFontEntry *aRealFontEntry) {
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uint32_t numFonts = mAvailableFonts.Length();
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uint32_t i;
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for (i = 0; i < numFonts; i++) {
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gfxFontEntry *fe = mAvailableFonts[i];
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if (fe == aProxyFontEntry) {
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// Note that this may delete aProxyFontEntry, if there's no
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// other reference to it except from its family.
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mAvailableFonts[i] = aRealFontEntry;
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aRealFontEntry->mFamilyName = Name();
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break;
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}
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}
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NS_ASSERTION(i < numFonts, "font entry not found in family!");
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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 gfxProxyFontEntry;
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class gfxUserFontSet {
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public:
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NS_INLINE_DECL_REFCOUNTING(gfxUserFontSet)
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gfxUserFontSet();
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virtual ~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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// mask of all unused bits, update when adding new formats
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FLAG_FORMAT_NOT_USED = ~((1 << 7)-1)
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};
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enum LoadStatus {
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STATUS_LOADING = 0,
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STATUS_LOADED,
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STATUS_FORMAT_NOT_SUPPORTED,
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STATUS_ERROR,
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STATUS_END_OF_LIST
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};
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// add in a font face
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// weight - 0 == unknown, [100, 900] otherwise (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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// TODO: support for unicode ranges not yet implemented
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gfxFontEntry *AddFontFace(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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uint32_t aItalicStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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const nsString& aLanguageOverride,
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gfxSparseBitSet *aUnicodeRanges = nullptr);
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// add in a font face for which we have the gfxFontEntry already
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void AddFontFace(const nsAString& aFamilyName, gfxFontEntry* aFontEntry);
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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 GetFamily(aFamilyName) != nullptr;
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}
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gfxFontFamily *GetFamily(const nsAString& aName) const;
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// Lookup a font entry for a given style, returns null if not loaded.
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// aFamily must be a family returned by our GetFamily method.
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gfxFontEntry *FindFontEntry(gfxFontFamily *aFamily,
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const gfxFontStyle& aFontStyle,
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bool& aNeedsBold,
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bool& aWaitForUserFont);
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// Find a family (possibly one of several!) that owns the given entry.
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// This may be somewhat expensive, as it enumerates all the fonts in
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// the set. Currently used only by the Linux (gfxPangoFontGroup) backend,
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// which does not directly track families in the font group's list.
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gfxFontFamily *FindFamilyFor(gfxFontEntry *aFontEntry) 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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// initialize the process that loads external font data, which upon
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// completion will call OnLoadComplete method
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virtual nsresult StartLoad(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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const gfxFontFaceSrc *aFontFaceSrc) = 0;
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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 NS_Free().
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bool OnLoadComplete(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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const uint8_t *aFontData, uint32_t aLength,
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nsresult aDownloadStatus);
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// Replace a proxy with a real fontEntry; this is implemented in
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// nsUserFontSet in order to keep track of the entry corresponding
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// to each @font-face rule.
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virtual void ReplaceFontEntry(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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gfxFontEntry *aFontEntry) = 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();
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class UserFontCache {
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public:
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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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static void CacheFont(gfxFontEntry *aFontEntry);
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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 proxy, 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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gfxProxyFontEntry *aProxy,
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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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#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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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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Flusher() {}
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virtual ~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 proxy
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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;
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gfxFontEntry *mFontEntry;
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bool mPrivate;
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Key(nsIURI* aURI, nsIPrincipal* aPrincipal,
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gfxFontEntry* aFontEntry, bool aPrivate)
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: mURI(aURI),
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mPrincipal(aPrincipal),
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mFontEntry(aFontEntry),
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mPrivate(aPrivate)
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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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Entry(KeyTypePointer aKey)
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: mURI(aKey->mURI),
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mPrincipal(aKey->mPrincipal),
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mFontEntry(aKey->mFontEntry),
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mPrivate(aKey->mPrivate)
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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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mFontEntry(aOther.mFontEntry),
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mPrivate(aOther.mPrivate)
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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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uint32_t principalHash;
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aKey->mPrincipal->GetHashValue(&principalHash);
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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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((uint32_t)aKey->mFontEntry->mItalic |
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(aKey->mFontEntry->mWeight << 1) |
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(aKey->mFontEntry->mStretch << 10) ) ^
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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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static PLDHashOperator RemoveIfPrivate(Entry* aEntry, void* aUserData);
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static PLDHashOperator RemoveIfMatches(Entry* aEntry, void* aUserData);
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static PLDHashOperator DisconnectSVG(Entry* aEntry, void* aUserData);
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#ifdef DEBUG_USERFONT_CACHE
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static PLDHashOperator DumpEntry(Entry* aEntry, void* aUserData);
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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;
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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 Forget()).
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gfxFontEntry *mFontEntry;
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// Whether this font was loaded from a private window.
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bool mPrivate;
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};
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static nsTHashtable<Entry> *sUserFonts;
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};
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protected:
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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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// for a given proxy font entry, attempt to load the next resource
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// in the src list
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LoadStatus LoadNext(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxyEntry);
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// helper method for creating a platform font
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// returns font entry if platform font creation successful
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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 NS_Free().
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gfxFontEntry* LoadFont(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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const uint8_t *aFontData, uint32_t &aLength);
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// parse data for a data URL
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virtual nsresult SyncLoadFontData(gfxProxyFontEntry *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(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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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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const uint8_t* SanitizeOpenTypeData(gfxMixedFontFamily *aFamily,
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gfxProxyFontEntry *aProxy,
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const uint8_t* aData,
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uint32_t aLength,
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uint32_t& aSaneLength,
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bool aIsCompressed);
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static bool OTSMessage(void *aUserData, const char *format, ...);
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// font families defined by @font-face rules
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nsRefPtrHashtable<nsStringHashKey, gfxMixedFontFamily> mFontFamilies;
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uint64_t mGeneration;
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static PRLogModuleInfo* GetUserFontsLog();
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private:
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static void CopyWOFFMetadata(const uint8_t* aFontData,
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uint32_t aLength,
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FallibleTArray<uint8_t>* aMetadata,
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uint32_t* aMetaOrigLen);
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};
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// acts a placeholder until the real font is downloaded
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class gfxProxyFontEntry : public gfxFontEntry {
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friend class gfxUserFontSet;
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public:
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gfxProxyFontEntry(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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uint32_t aWeight,
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int32_t aStretch,
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uint32_t aItalicStyle,
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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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virtual ~gfxProxyFontEntry();
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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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uint32_t aItalicStyle,
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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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virtual gfxFont *CreateFontInstance(const gfxFontStyle *aFontStyle, bool aNeedsBold);
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// note that code depends on the ordering of these values!
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enum LoadingState {
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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_FAILED // failed to load any source: use fallback
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};
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LoadingState mLoadingState;
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bool mUnsupportedFormat;
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nsTArray<gfxFontFaceSrc> mSrcList;
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uint32_t mSrcIndex; // index of loading src item
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nsFontFaceLoader *mLoader; // current loader for this entry, if any
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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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