зеркало из https://github.com/mozilla/gecko-dev.git
624 строки
22 KiB
C++
624 строки
22 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is thebes gfx code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2008-2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* John Daggett <jdaggett@mozilla.com>
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* Jonathan Kew <jfkthame@gmail.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifdef MOZ_LOGGING
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#define FORCE_PR_LOG /* Allow logging in the release build */
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#endif /* MOZ_LOGGING */
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#include "prlog.h"
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#include "gfxUserFontSet.h"
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#include "gfxPlatform.h"
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#include "nsReadableUtils.h"
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#include "nsUnicharUtils.h"
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#include "prlong.h"
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#include "woff.h"
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#include "opentype-sanitiser.h"
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#include "ots-memory-stream.h"
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using namespace mozilla;
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#ifdef PR_LOGGING
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static PRLogModuleInfo *gUserFontsLog = PR_NewLogModule("userfonts");
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#endif /* PR_LOGGING */
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#define LOG(args) PR_LOG(gUserFontsLog, PR_LOG_DEBUG, args)
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#define LOG_ENABLED() PR_LOG_TEST(gUserFontsLog, PR_LOG_DEBUG)
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static PRUint64 sFontSetGeneration = LL_INIT(0, 0);
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// TODO: support for unicode ranges not yet implemented
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gfxProxyFontEntry::gfxProxyFontEntry(const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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gfxMixedFontFamily *aFamily,
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PRUint32 aWeight,
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PRUint32 aStretch,
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PRUint32 aItalicStyle,
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const nsTArray<gfxFontFeature>& aFeatureSettings,
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PRUint32 aLanguageOverride,
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gfxSparseBitSet *aUnicodeRanges)
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: gfxFontEntry(NS_LITERAL_STRING("Proxy"), aFamily),
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mLoadingState(NOT_LOADING)
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{
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mIsProxy = PR_TRUE;
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mSrcList = aFontFaceSrcList;
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mSrcIndex = 0;
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mWeight = aWeight;
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mStretch = aStretch;
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mItalic = (aItalicStyle & (FONT_STYLE_ITALIC | FONT_STYLE_OBLIQUE)) != 0;
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mFeatureSettings.AppendElements(aFeatureSettings);
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mLanguageOverride = aLanguageOverride;
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mIsUserFont = PR_TRUE;
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}
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gfxProxyFontEntry::~gfxProxyFontEntry()
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{
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}
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gfxFont*
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gfxProxyFontEntry::CreateFontInstance(const gfxFontStyle *aFontStyle, PRBool aNeedsBold)
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{
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// cannot create an actual font for a proxy entry
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return nsnull;
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}
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gfxUserFontSet::gfxUserFontSet()
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{
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mFontFamilies.Init(5);
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IncrementGeneration();
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}
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gfxUserFontSet::~gfxUserFontSet()
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{
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}
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gfxFontEntry*
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gfxUserFontSet::AddFontFace(const nsAString& aFamilyName,
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const nsTArray<gfxFontFaceSrc>& aFontFaceSrcList,
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PRUint32 aWeight,
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PRUint32 aStretch,
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PRUint32 aItalicStyle,
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const nsString& aFeatureSettings,
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const nsString& aLanguageOverride,
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gfxSparseBitSet *aUnicodeRanges)
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{
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gfxProxyFontEntry *proxyEntry = nsnull;
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nsAutoString key(aFamilyName);
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ToLowerCase(key);
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PRBool found;
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if (aWeight == 0)
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aWeight = FONT_WEIGHT_NORMAL;
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// stretch, italic/oblique ==> zero implies normal
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gfxMixedFontFamily *family = mFontFamilies.GetWeak(key, &found);
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if (!family) {
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family = new gfxMixedFontFamily(aFamilyName);
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mFontFamilies.Put(key, family);
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}
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// construct a new face and add it into the family
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nsTArray<gfxFontFeature> featureSettings;
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gfxFontStyle::ParseFontFeatureSettings(aFeatureSettings,
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featureSettings);
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PRUint32 languageOverride =
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gfxFontStyle::ParseFontLanguageOverride(aLanguageOverride);
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proxyEntry =
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new gfxProxyFontEntry(aFontFaceSrcList, family, aWeight, aStretch,
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aItalicStyle,
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featureSettings,
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languageOverride,
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aUnicodeRanges);
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family->AddFontEntry(proxyEntry);
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#ifdef PR_LOGGING
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if (LOG_ENABLED()) {
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LOG(("userfonts (%p) added (%s) with style: %s weight: %d stretch: %d",
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this, NS_ConvertUTF16toUTF8(aFamilyName).get(),
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(aItalicStyle & FONT_STYLE_ITALIC ? "italic" :
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(aItalicStyle & FONT_STYLE_OBLIQUE ? "oblique" : "normal")),
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aWeight, aStretch));
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}
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#endif
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return proxyEntry;
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}
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void
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gfxUserFontSet::AddFontFace(const nsAString& aFamilyName,
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gfxFontEntry *aFontEntry)
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{
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nsAutoString key(aFamilyName);
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ToLowerCase(key);
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PRBool found;
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gfxMixedFontFamily *family = mFontFamilies.GetWeak(key, &found);
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if (!family) {
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family = new gfxMixedFontFamily(aFamilyName);
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mFontFamilies.Put(key, family);
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}
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family->AddFontEntry(aFontEntry);
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}
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gfxFontEntry*
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gfxUserFontSet::FindFontEntry(const nsAString& aName,
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const gfxFontStyle& aFontStyle,
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PRBool& aFoundFamily,
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PRBool& aNeedsBold,
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PRBool& aWaitForUserFont)
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{
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aWaitForUserFont = PR_FALSE;
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gfxMixedFontFamily *family = GetFamily(aName);
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// no user font defined for this name
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if (!family) {
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aFoundFamily = PR_FALSE;
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return nsnull;
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}
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aFoundFamily = PR_TRUE;
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gfxFontEntry* fe = family->FindFontForStyle(aFontStyle, aNeedsBold);
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// if not a proxy, font has already been loaded
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if (!fe->mIsProxy) {
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return fe;
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}
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gfxProxyFontEntry *proxyEntry = static_cast<gfxProxyFontEntry*> (fe);
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// if currently loading, return null for now
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if (proxyEntry->mLoadingState > gfxProxyFontEntry::NOT_LOADING) {
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aWaitForUserFont =
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(proxyEntry->mLoadingState < gfxProxyFontEntry::LOADING_SLOWLY);
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return nsnull;
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}
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// hasn't been loaded yet, start the load process
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LoadStatus status;
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// NOTE that if all sources in the entry fail, this will delete proxyEntry,
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// so we cannot use it again if status==STATUS_END_OF_LIST
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status = LoadNext(proxyEntry);
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// if the load succeeded immediately, the font entry was replaced so
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// search again
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if (status == STATUS_LOADED) {
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return family->FindFontForStyle(aFontStyle, aNeedsBold);
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}
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// check whether we should wait for load to complete before painting
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// a fallback font -- but not if all sources failed (bug 633500)
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aWaitForUserFont = (status != STATUS_END_OF_LIST) &&
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(proxyEntry->mLoadingState < gfxProxyFontEntry::LOADING_SLOWLY);
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// if either loading or an error occurred, return null
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return nsnull;
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}
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// Given a buffer of downloaded font data, do any necessary preparation
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// to make it into usable OpenType.
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// May return the original pointer unchanged, or a newly-allocated
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// block (in which case the passed-in block is NS_Free'd).
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// aLength is updated if necessary to the new length of the data.
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// Returns NULL and NS_Free's the incoming data in case of errors.
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static const PRUint8*
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PrepareOpenTypeData(const PRUint8* aData, PRUint32* aLength)
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{
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switch(gfxFontUtils::DetermineFontDataType(aData, *aLength)) {
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case GFX_USERFONT_OPENTYPE:
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// nothing to do
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return aData;
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case GFX_USERFONT_WOFF: {
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PRUint32 status = eWOFF_ok;
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PRUint32 bufferSize = woffGetDecodedSize(aData, *aLength, &status);
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if (WOFF_FAILURE(status)) {
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break;
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}
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PRUint8* decodedData = static_cast<PRUint8*>(NS_Alloc(bufferSize));
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if (!decodedData) {
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break;
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}
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woffDecodeToBuffer(aData, *aLength,
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decodedData, bufferSize,
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aLength, &status);
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// replace original data with the decoded version
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NS_Free((void*)aData);
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aData = decodedData;
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if (WOFF_FAILURE(status)) {
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// something went wrong, discard the data and return NULL
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break;
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}
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// success, return the decoded data
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return aData;
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}
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// xxx - add support for other wrappers here
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default:
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NS_WARNING("unknown font format");
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break;
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}
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// discard downloaded data that couldn't be used
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NS_Free((void*)aData);
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return nsnull;
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}
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// Based on ots::ExpandingMemoryStream from ots-memory-stream.h,
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// adapted to use Mozilla allocators and to allow the final
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// memory buffer to be adopted by the client.
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class ExpandingMemoryStream : public ots::OTSStream {
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public:
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ExpandingMemoryStream(size_t initial, size_t limit)
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: mLength(initial), mLimit(limit), mOff(0) {
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mPtr = NS_Alloc(mLength);
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}
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~ExpandingMemoryStream() {
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NS_Free(mPtr);
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}
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// return the buffer, and give up ownership of it
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// so the caller becomes responsible to call NS_Free
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// when finished with it
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void* forget() {
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void* p = mPtr;
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mPtr = nsnull;
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return p;
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}
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bool WriteRaw(const void *data, size_t length) {
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if ((mOff + length > mLength) ||
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(mLength > std::numeric_limits<size_t>::max() - mOff)) {
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if (mLength == mLimit) {
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return false;
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}
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size_t newLength = (mLength + 1) * 2;
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if (newLength < mLength) {
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return false;
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}
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if (newLength > mLimit) {
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newLength = mLimit;
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}
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mPtr = NS_Realloc(mPtr, newLength);
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mLength = newLength;
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return WriteRaw(data, length);
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}
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std::memcpy(static_cast<char*>(mPtr) + mOff, data, length);
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mOff += length;
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return true;
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}
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bool Seek(off_t position) {
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if (position < 0) {
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return false;
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}
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if (static_cast<size_t>(position) > mLength) {
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return false;
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}
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mOff = position;
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return true;
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}
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off_t Tell() const {
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return mOff;
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}
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private:
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void* mPtr;
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size_t mLength;
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const size_t mLimit;
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off_t mOff;
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};
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// Call the OTS library to sanitize an sfnt before attempting to use it.
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// Returns a newly-allocated block, or NULL in case of fatal errors.
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static const PRUint8*
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SanitizeOpenTypeData(const PRUint8* aData, PRUint32 aLength,
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PRUint32& aSaneLength, bool aIsCompressed)
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{
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// limit output/expansion to 256MB
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ExpandingMemoryStream output(aIsCompressed ? aLength * 2 : aLength,
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1024 * 1024 * 256);
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if (ots::Process(&output, aData, aLength)) {
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aSaneLength = output.Tell();
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return static_cast<PRUint8*>(output.forget());
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} else {
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aSaneLength = 0;
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return nsnull;
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}
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}
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// This is called when a font download finishes.
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// Ownership of aFontData passes in here, and the font set must
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// ensure that it is eventually deleted via NS_Free().
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PRBool
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gfxUserFontSet::OnLoadComplete(gfxProxyFontEntry *aProxy,
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const PRUint8 *aFontData, PRUint32 aLength,
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nsresult aDownloadStatus)
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{
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// download successful, make platform font using font data
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if (NS_SUCCEEDED(aDownloadStatus)) {
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gfxFontEntry *fe = nsnull;
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// Unwrap/decompress/sanitize or otherwise munge the downloaded data
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// to make a usable sfnt structure.
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if (gfxPlatform::GetPlatform()->SanitizeDownloadedFonts()) {
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gfxUserFontType fontType =
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gfxFontUtils::DetermineFontDataType(aFontData, aLength);
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// Call the OTS sanitizer; this will also decode WOFF to sfnt
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// if necessary. The original data in aFontData is left unchanged.
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PRUint32 saneLen;
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const PRUint8* saneData =
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SanitizeOpenTypeData(aFontData, aLength, saneLen,
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fontType == GFX_USERFONT_WOFF);
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#ifdef DEBUG
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if (!saneData) {
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char buf[1000];
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sprintf(buf, "downloaded font rejected for \"%s\"",
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NS_ConvertUTF16toUTF8(aProxy->FamilyName()).get());
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NS_WARNING(buf);
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}
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#endif
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if (saneData) {
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// Here ownership of saneData is passed to the platform,
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// which will delete it when no longer required
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fe = gfxPlatform::GetPlatform()->MakePlatformFont(aProxy,
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saneData,
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saneLen);
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if (!fe) {
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NS_WARNING("failed to make platform font from download");
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}
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}
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} else {
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// FIXME: this code can be removed once we remove the pref to
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// disable the sanitizer; the PrepareOpenTypeData and
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// ValidateSFNTHeaders functions will then be obsolete.
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aFontData = PrepareOpenTypeData(aFontData, &aLength);
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if (aFontData) {
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if (gfxFontUtils::ValidateSFNTHeaders(aFontData, aLength)) {
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// Here ownership of aFontData is passed to the platform,
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// which will delete it when no longer required
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fe = gfxPlatform::GetPlatform()->MakePlatformFont(aProxy,
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aFontData,
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aLength);
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aFontData = nsnull; // we must NOT free this below!
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} else {
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// the data was unusable, so just discard it
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// (error will be reported below, if logging is enabled)
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NS_WARNING("failed to make platform font from download");
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}
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}
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}
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if (aFontData) {
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NS_Free((void*)aFontData);
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aFontData = nsnull;
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}
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if (fe) {
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// copy OpenType feature/language settings from the proxy to the
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// newly-created font entry
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fe->mFeatureSettings.AppendElements(aProxy->mFeatureSettings);
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fe->mLanguageOverride = aProxy->mLanguageOverride;
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#ifdef PR_LOGGING
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// must do this before ReplaceFontEntry() because that will
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// clear the proxy's mFamily pointer!
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if (LOG_ENABLED()) {
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nsCAutoString fontURI;
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aProxy->mSrcList[aProxy->mSrcIndex].mURI->GetSpec(fontURI);
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LOG(("userfonts (%p) [src %d] loaded uri: (%s) for (%s) gen: %8.8x\n",
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this, aProxy->mSrcIndex, fontURI.get(),
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NS_ConvertUTF16toUTF8(aProxy->mFamily->Name()).get(),
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PRUint32(mGeneration)));
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}
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#endif
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ReplaceFontEntry(aProxy, fe);
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IncrementGeneration();
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return PR_TRUE;
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} else {
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#ifdef PR_LOGGING
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if (LOG_ENABLED()) {
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nsCAutoString fontURI;
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aProxy->mSrcList[aProxy->mSrcIndex].mURI->GetSpec(fontURI);
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LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s) error making platform font\n",
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this, aProxy->mSrcIndex, fontURI.get(),
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NS_ConvertUTF16toUTF8(aProxy->mFamily->Name()).get()));
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}
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#endif
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}
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} else {
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// download failed
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#ifdef PR_LOGGING
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if (LOG_ENABLED()) {
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nsCAutoString fontURI;
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aProxy->mSrcList[aProxy->mSrcIndex].mURI->GetSpec(fontURI);
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LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s) error %8.8x downloading font data\n",
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this, aProxy->mSrcIndex, fontURI.get(),
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NS_ConvertUTF16toUTF8(aProxy->mFamily->Name()).get(),
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aDownloadStatus));
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}
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#endif
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}
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if (aFontData) {
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NS_Free((void*)aFontData);
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}
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// error occurred, load next src
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LoadStatus status;
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status = LoadNext(aProxy);
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// Even if loading failed, we need to bump the font-set generation
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// and return true in order to trigger reflow, so that fallback
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// will be used where the text was "masked" by the pending download
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IncrementGeneration();
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return PR_TRUE;
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}
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gfxUserFontSet::LoadStatus
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gfxUserFontSet::LoadNext(gfxProxyFontEntry *aProxyEntry)
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{
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PRUint32 numSrc = aProxyEntry->mSrcList.Length();
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|
|
NS_ASSERTION(aProxyEntry->mSrcIndex < numSrc, "already at the end of the src list for user font");
|
|
|
|
if (aProxyEntry->mLoadingState == gfxProxyFontEntry::NOT_LOADING) {
|
|
aProxyEntry->mLoadingState = gfxProxyFontEntry::LOADING_STARTED;
|
|
} else {
|
|
// we were already loading; move to the next source,
|
|
// but don't reset state - if we've already timed out,
|
|
// that counts against the new download
|
|
aProxyEntry->mSrcIndex++;
|
|
}
|
|
|
|
// load each src entry in turn, until a local face is found or a download begins successfully
|
|
while (aProxyEntry->mSrcIndex < numSrc) {
|
|
const gfxFontFaceSrc& currSrc = aProxyEntry->mSrcList[aProxyEntry->mSrcIndex];
|
|
|
|
// src local ==> lookup and load
|
|
|
|
if (currSrc.mIsLocal) {
|
|
gfxFontEntry *fe =
|
|
gfxPlatform::GetPlatform()->LookupLocalFont(aProxyEntry,
|
|
currSrc.mLocalName);
|
|
if (fe) {
|
|
LOG(("userfonts (%p) [src %d] loaded local: (%s) for (%s) gen: %8.8x\n",
|
|
this, aProxyEntry->mSrcIndex,
|
|
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
|
|
NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get(),
|
|
PRUint32(mGeneration)));
|
|
fe->mFeatureSettings.AppendElements(aProxyEntry->mFeatureSettings);
|
|
fe->mLanguageOverride = aProxyEntry->mLanguageOverride;
|
|
ReplaceFontEntry(aProxyEntry, fe);
|
|
return STATUS_LOADED;
|
|
} else {
|
|
LOG(("userfonts (%p) [src %d] failed local: (%s) for (%s)\n",
|
|
this, aProxyEntry->mSrcIndex,
|
|
NS_ConvertUTF16toUTF8(currSrc.mLocalName).get(),
|
|
NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get()));
|
|
}
|
|
}
|
|
|
|
// src url ==> start the load process
|
|
else {
|
|
if (gfxPlatform::GetPlatform()->IsFontFormatSupported(currSrc.mURI,
|
|
currSrc.mFormatFlags)) {
|
|
nsresult rv = StartLoad(aProxyEntry, &currSrc);
|
|
PRBool loadOK = NS_SUCCEEDED(rv);
|
|
|
|
if (loadOK) {
|
|
#ifdef PR_LOGGING
|
|
if (LOG_ENABLED()) {
|
|
nsCAutoString fontURI;
|
|
currSrc.mURI->GetSpec(fontURI);
|
|
LOG(("userfonts (%p) [src %d] loading uri: (%s) for (%s)\n",
|
|
this, aProxyEntry->mSrcIndex, fontURI.get(),
|
|
NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get()));
|
|
}
|
|
#endif
|
|
return STATUS_LOADING;
|
|
} else {
|
|
#ifdef PR_LOGGING
|
|
if (LOG_ENABLED()) {
|
|
nsCAutoString fontURI;
|
|
currSrc.mURI->GetSpec(fontURI);
|
|
LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s) download failed\n",
|
|
this, aProxyEntry->mSrcIndex, fontURI.get(),
|
|
NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get()));
|
|
}
|
|
#endif
|
|
}
|
|
} else {
|
|
#ifdef PR_LOGGING
|
|
if (LOG_ENABLED()) {
|
|
nsCAutoString fontURI;
|
|
currSrc.mURI->GetSpec(fontURI);
|
|
LOG(("userfonts (%p) [src %d] failed uri: (%s) for (%s) format not supported\n",
|
|
this, aProxyEntry->mSrcIndex, fontURI.get(),
|
|
NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get()));
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
aProxyEntry->mSrcIndex++;
|
|
}
|
|
|
|
// all src's failed; mark this entry as unusable (so fallback will occur)
|
|
LOG(("userfonts (%p) failed all src for (%s)\n",
|
|
this, NS_ConvertUTF16toUTF8(aProxyEntry->mFamily->Name()).get()));
|
|
aProxyEntry->mLoadingState = gfxProxyFontEntry::LOADING_FAILED;
|
|
|
|
return STATUS_END_OF_LIST;
|
|
}
|
|
|
|
void
|
|
gfxUserFontSet::IncrementGeneration()
|
|
{
|
|
// add one, increment again if zero
|
|
LL_ADD(sFontSetGeneration, sFontSetGeneration, 1);
|
|
if (LL_IS_ZERO(sFontSetGeneration))
|
|
LL_ADD(sFontSetGeneration, sFontSetGeneration, 1);
|
|
mGeneration = sFontSetGeneration;
|
|
}
|
|
|
|
|
|
gfxMixedFontFamily*
|
|
gfxUserFontSet::GetFamily(const nsAString& aFamilyName) const
|
|
{
|
|
nsAutoString key(aFamilyName);
|
|
ToLowerCase(key);
|
|
|
|
return mFontFamilies.GetWeak(key);
|
|
}
|