зеркало из https://github.com/mozilla/gecko-dev.git
481 строка
19 KiB
C++
481 строка
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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