The Tor Browser: gfx/skia/trunk/src/ports/SkFontConfigInterface

gfx/skia/trunk/src/ports/SkFontConfigInterface_android.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/ports/SkFontConfigInterface_android.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkFontConfigInterface.h"
 #include "SkTypeface_android.h"
 #include "SkFontConfigParser_android.h"
 #include "SkFontConfigTypeface.h"
 #include "SkFontMgr.h"
 #include "SkGlyphCache.h"
 #include "SkPaint.h"
 #include "SkString.h"
 #include "SkStream.h"
 #include "SkThread.h"
 #include "SkTypefaceCache.h"
 #include "SkTArray.h"
 #include "SkTDict.h"
 #include "SkTSearch.h"
 #include <stdio.h>
 #include <string.h>
 #ifndef SK_DEBUG_FONTS
     #define SK_DEBUG_FONTS 0
 #endif
 #if SK_DEBUG_FONTS
     #define DEBUG_FONT(args) SkDebugf args
 #else
     #define DEBUG_FONT(args)
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 // For test only.
 static const char* gTestMainConfigFile = NULL;
 static const char* gTestFallbackConfigFile = NULL;
 static const char* gTestFontFilePrefix = NULL;
 ///////////////////////////////////////////////////////////////////////////////
 typedef int32_t FontRecID;
 #define INVALID_FONT_REC_ID -1
 typedef int32_t FamilyRecID;
 #define INVALID_FAMILY_REC_ID -1
 // used to record our notion of the pre-existing fonts
 struct FontRec {
     SkRefPtr<SkTypeface> fTypeface;
     SkString fFileName;
     SkTypeface::Style fStyle;
     bool fIsValid;
     FamilyRecID fFamilyRecID;
 };
 struct FamilyRec {
     FamilyRec() {
         memset(fFontRecID, INVALID_FONT_REC_ID, sizeof(fFontRecID));
     }
     static const int FONT_STYLE_COUNT = 4;
     FontRecID fFontRecID[FONT_STYLE_COUNT];
     bool fIsFallbackFont;
     SkString fFallbackName;
     SkPaintOptionsAndroid fPaintOptions;
 };
 typedef SkTDArray<FamilyRecID> FallbackFontList;
 class SkFontConfigInterfaceAndroid : public SkFontConfigInterface {
 public:
     SkFontConfigInterfaceAndroid(SkTDArray<FontFamily*>& fontFamilies);
     virtual ~SkFontConfigInterfaceAndroid();
     virtual bool matchFamilyName(const char familyName[],
                                  SkTypeface::Style requested,
                                  FontIdentity* outFontIdentifier,
                                  SkString* outFamilyName,
                                  SkTypeface::Style* outStyle) SK_OVERRIDE;
     virtual SkStream* openStream(const FontIdentity&) SK_OVERRIDE;
     // new APIs
     virtual SkDataTable* getFamilyNames() SK_OVERRIDE;
     virtual bool matchFamilySet(const char inFamilyName[],
                                 SkString* outFamilyName,
                                 SkTArray<FontIdentity>*) SK_OVERRIDE;
     /**
      *  Get the family name of the font in the default fallback font list that
      *  contains the specified chararacter. if no font is found, returns false.
      */
     bool getFallbackFamilyNameForChar(SkUnichar uni, const char* lang, SkString* name);
     /**
      *
      */
     SkTypeface* getTypefaceForChar(SkUnichar uni, SkTypeface::Style style,
                                    SkPaintOptionsAndroid::FontVariant fontVariant);
     SkTypeface* nextLogicalTypeface(SkFontID currFontID, SkFontID origFontID,
                                     const SkPaintOptionsAndroid& options);
     SkTypeface* getTypefaceForGlyphID(uint16_t glyphID, const SkTypeface* origTypeface,
                                       const SkPaintOptionsAndroid& options,
                                       int* lowerBounds, int* upperBounds);
 private:
     void addFallbackFamily(FamilyRecID fontRecID);
     SkTypeface* getTypefaceForFontRec(FontRecID fontRecID);
     FallbackFontList* getCurrentLocaleFallbackFontList();
     FallbackFontList* findFallbackFontList(const SkLanguage& lang, bool isOriginal = true);
     SkTArray<FontRec> fFonts;
     SkTArray<FamilyRec> fFontFamilies;
     SkTDict<FamilyRecID> fFamilyNameDict;
     FamilyRecID fDefaultFamilyRecID;
     // (SkLanguage)<->(fallback chain index) translation
     SkTDict<FallbackFontList*> fFallbackFontDict;
     SkTDict<FallbackFontList*> fFallbackFontAliasDict;
     FallbackFontList fDefaultFallbackList;
     // fallback info for current locale
     SkString fCachedLocale;
     FallbackFontList* fLocaleFallbackFontList;
 };
 ///////////////////////////////////////////////////////////////////////////////
 static SkFontConfigInterfaceAndroid* getSingletonInterface() {
     SK_DECLARE_STATIC_MUTEX(gMutex);
     static SkFontConfigInterfaceAndroid* gFontConfigInterface;
     SkAutoMutexAcquire ac(gMutex);
     if (NULL == gFontConfigInterface) {
         // load info from a configuration file that we can use to populate the
         // system/fallback font structures
         SkTDArray<FontFamily*> fontFamilies;
         if (!gTestMainConfigFile) {
             SkFontConfigParser::GetFontFamilies(fontFamilies);
         } else {
             SkFontConfigParser::GetTestFontFamilies(fontFamilies, gTestMainConfigFile,
                                                     gTestFallbackConfigFile);
         }
         gFontConfigInterface = new SkFontConfigInterfaceAndroid(fontFamilies);
         // cleanup the data we received from the parser
         fontFamilies.deleteAll();
     }
     return gFontConfigInterface;
 }
 SkFontConfigInterface* SkFontConfigInterface::GetSingletonDirectInterface() {
     return getSingletonInterface();
 }
 ///////////////////////////////////////////////////////////////////////////////
 static bool has_font(const SkTArray<FontRec>& array, const SkString& filename) {
     for (int i = 0; i < array.count(); i++) {
         if (array[i].fFileName == filename) {
             return true;
         }
     }
     return false;
 }
 #ifndef SK_FONT_FILE_PREFIX
     #define SK_FONT_FILE_PREFIX          "/fonts/"
 #endif
 static void get_path_for_sys_fonts(SkString* full, const char name[]) {
     if (gTestFontFilePrefix) {
         full->set(gTestFontFilePrefix);
     } else {
         full->set(getenv("ANDROID_ROOT"));
         full->append(SK_FONT_FILE_PREFIX);
     }
     full->append(name);
 }
 static void insert_into_name_dict(SkTDict<FamilyRecID>& familyNameDict,
                                   const char* name, FamilyRecID familyRecID) {
     SkAutoAsciiToLC tolc(name);
     if (familyNameDict.find(tolc.lc())) {
         SkDebugf("---- system font attempting to use a the same name [%s] for"
                  "multiple families. skipping subsequent occurrences", tolc.lc());
     } else {
         familyNameDict.set(tolc.lc(), familyRecID);
     }
 }
 // Defined in SkFontHost_FreeType.cpp
 bool find_name_and_attributes(SkStream* stream, SkString* name,
                               SkTypeface::Style* style, bool* isFixedWidth);
 ///////////////////////////////////////////////////////////////////////////////
 SkFontConfigInterfaceAndroid::SkFontConfigInterfaceAndroid(SkTDArray<FontFamily*>& fontFamilies) :
         fFonts(fontFamilies.count()),
         fFontFamilies(fontFamilies.count() / FamilyRec::FONT_STYLE_COUNT),
         fFamilyNameDict(1024),
         fDefaultFamilyRecID(INVALID_FAMILY_REC_ID),
         fFallbackFontDict(128),
         fFallbackFontAliasDict(128),
         fLocaleFallbackFontList(NULL) {
     for (int i = 0; i < fontFamilies.count(); ++i) {
         FontFamily* family = fontFamilies[i];
         // defer initializing the familyRec until we can be sure that at least
         // one of it's children contains a valid font file
         FamilyRec* familyRec = NULL;
         FamilyRecID familyRecID = INVALID_FAMILY_REC_ID;
         for (int j = 0; j < family->fFontFiles.count(); ++j) {
             SkString filename;
             get_path_for_sys_fonts(&filename, family->fFontFiles[j]->fFileName);
             if (has_font(fFonts, filename)) {
                 SkDebugf("---- system font and fallback font files specify a duplicate "
                         "font %s, skipping the second occurrence", filename.c_str());
                 continue;
             }
             FontRec& fontRec = fFonts.push_back();
             fontRec.fFileName = filename;
             fontRec.fStyle = SkTypeface::kNormal;
             fontRec.fIsValid = false;
             fontRec.fFamilyRecID = familyRecID;
             const FontRecID fontRecID = fFonts.count() - 1;
             SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(filename.c_str()));
             if (stream.get() != NULL) {
                 bool isFixedWidth;
                 SkString name;
                 fontRec.fIsValid = find_name_and_attributes(stream.get(), &name,
                                                             &fontRec.fStyle, &isFixedWidth);
             } else {
                 if (!family->fIsFallbackFont) {
                     SkDebugf("---- failed to open <%s> as a font\n", filename.c_str());
                 }
             }
             if (fontRec.fIsValid) {
                 DEBUG_FONT(("---- SystemFonts[%d][%d] fallback=%d file=%s",
                            i, fFonts.count() - 1, family->fIsFallbackFont, filename.c_str()));
             } else {
                 DEBUG_FONT(("---- SystemFonts[%d][%d] fallback=%d file=%s (INVALID)",
                            i, fFonts.count() - 1, family->fIsFallbackFont, filename.c_str()));
                 continue;
             }
             // create a familyRec now that we know that at least one font in
             // the family is valid
             if (familyRec == NULL) {
                 familyRec = &fFontFamilies.push_back();
                 familyRecID = fFontFamilies.count() - 1;
                 fontRec.fFamilyRecID = familyRecID;
                 familyRec->fIsFallbackFont = family->fIsFallbackFont;
                 familyRec->fPaintOptions = family->fFontFiles[j]->fPaintOptions;
             } else if (familyRec->fPaintOptions != family->fFontFiles[j]->fPaintOptions) {
                 SkDebugf("Every font file within a family must have identical"
                          "language and variant attributes");
                 sk_throw();
             }
             // add this font to the current familyRec
             if (INVALID_FONT_REC_ID != familyRec->fFontRecID[fontRec.fStyle]) {
                 DEBUG_FONT(("Overwriting familyRec for style[%d] old,new:(%d,%d)",
                             fontRec.fStyle, familyRec->fFontRecID[fontRec.fStyle],
                             fontRecID));
             }
             familyRec->fFontRecID[fontRec.fStyle] = fontRecID;
         }
         if (familyRec) {
             if (familyRec->fIsFallbackFont) {
                 // add the font to the appropriate fallback chains and also insert a
                 // unique name into the familyNameDict for internal usage
                 addFallbackFamily(familyRecID);
             } else {
                 // add the names that map to this family to the dictionary for easy lookup
                 const SkTDArray<const char*>& names = family->fNames;
                 if (names.isEmpty()) {
                     SkDEBUGFAIL("ERROR: non-fallback font with no name");
                     continue;
                 }
                 for (int i = 0; i < names.count(); i++) {
                     insert_into_name_dict(fFamilyNameDict, names[i], familyRecID);
                 }
             }
         }
     }
     DEBUG_FONT(("---- We have %d system fonts", fFonts.count()));
     if (fFontFamilies.count() > 0) {
         fDefaultFamilyRecID = 0;
     }
     // scans the default fallback font chain, adding every entry to every other
     // fallback font chain to which it does not belong. this results in every
     // language-specific fallback font chain having all of its fallback fonts at
     // the front of the chain, and everything else at the end.
     FallbackFontList* fallbackList;
     SkTDict<FallbackFontList*>::Iter iter(fFallbackFontDict);
     const char* fallbackLang = iter.next(&fallbackList);
     while(fallbackLang != NULL) {
         for (int i = 0; i < fDefaultFallbackList.count(); i++) {
             FamilyRecID familyRecID = fDefaultFallbackList[i];
             const SkString& fontLang = fFontFamilies[familyRecID].fPaintOptions.getLanguage().getTag();
             if (strcmp(fallbackLang, fontLang.c_str()) != 0) {
                 fallbackList->push(familyRecID);
             }
         }
         // move to the next fallback list in the dictionary
         fallbackLang = iter.next(&fallbackList);
     }
 }
 SkFontConfigInterfaceAndroid::~SkFontConfigInterfaceAndroid() {
     // iterate through and cleanup fFallbackFontDict
     SkTDict<FallbackFontList*>::Iter iter(fFallbackFontDict);
     FallbackFontList* fallbackList;
     while(iter.next(&fallbackList) != NULL) {
         SkDELETE(fallbackList);
     }
 }
 void SkFontConfigInterfaceAndroid::addFallbackFamily(FamilyRecID familyRecID) {
     SkASSERT(familyRecID < fFontFamilies.count());
     FamilyRec& familyRec = fFontFamilies[familyRecID];
     SkASSERT(familyRec.fIsFallbackFont);
     // add the fallback family to the name dictionary.  This is
     // needed by getFallbackFamilyNameForChar() so that fallback
     // families can be identified by a unique name. The unique
     // identifier that we've chosen is the familyID in hex (e.g. '0F##fallback').
     familyRec.fFallbackName.printf("%.2x##fallback", familyRecID);
     insert_into_name_dict(fFamilyNameDict, familyRec.fFallbackName.c_str(), familyRecID);
     // add to the default fallback list
     fDefaultFallbackList.push(familyRecID);
     // stop here if it is the default language tag
     const SkString& languageTag = familyRec.fPaintOptions.getLanguage().getTag();
     if (languageTag.isEmpty()) {
         return;
     }
     // add to the appropriate language's custom fallback list
     FallbackFontList* customList = NULL;
     if (!fFallbackFontDict.find(languageTag.c_str(), &customList)) {
         DEBUG_FONT(("----  Created fallback list for \"%s\"", languageTag.c_str()));
         customList = SkNEW(FallbackFontList);
         fFallbackFontDict.set(languageTag.c_str(), customList);
     }
     SkASSERT(customList != NULL);
     customList->push(familyRecID);
 }
 static FontRecID find_best_style(const FamilyRec& family, SkTypeface::Style style) {
     const FontRecID* fontRecIDs = family.fFontRecID;
     if (fontRecIDs[style] != INVALID_FONT_REC_ID) { // exact match
         return fontRecIDs[style];
     }
     // look for a matching bold
     style = (SkTypeface::Style)(style ^ SkTypeface::kItalic);
     if (fontRecIDs[style] != INVALID_FONT_REC_ID) {
         return fontRecIDs[style];
     }
     // look for the plain
     if (fontRecIDs[SkTypeface::kNormal] != INVALID_FONT_REC_ID) {
         return fontRecIDs[SkTypeface::kNormal];
     }
     // look for anything
     for (int i = 0; i < FamilyRec::FONT_STYLE_COUNT; i++) {
         if (fontRecIDs[i] != INVALID_FONT_REC_ID) {
             return fontRecIDs[i];
         }
     }
     // should never get here, since the fontRecID list should not be empty
     SkDEBUGFAIL("No valid fonts exist for this family");
     return -1;
 }
 bool SkFontConfigInterfaceAndroid::matchFamilyName(const char familyName[],
                                                    SkTypeface::Style style,
                                                    FontIdentity* outFontIdentifier,
                                                    SkString* outFamilyName,
                                                    SkTypeface::Style* outStyle) {
     // clip to legal style bits
     style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
     bool exactNameMatch = false;
     FamilyRecID familyRecID = INVALID_FAMILY_REC_ID;
     if (NULL != familyName) {
         SkAutoAsciiToLC tolc(familyName);
         if (fFamilyNameDict.find(tolc.lc(), &familyRecID)) {
             exactNameMatch = true;
         }
     } else {
         familyRecID = fDefaultFamilyRecID;
     }
     // If no matching family name is found then return false. This allows clients
     // to be able to search for other fonts instead of forcing them to use the
     // default font.
     if (INVALID_FAMILY_REC_ID == familyRecID) {
         return false;
     }
     FontRecID fontRecID = find_best_style(fFontFamilies[familyRecID], style);
     FontRec& fontRec = fFonts[fontRecID];
     if (NULL != outFontIdentifier) {
         outFontIdentifier->fID = fontRecID;
         outFontIdentifier->fTTCIndex = 0;
         outFontIdentifier->fString.set(fontRec.fFileName);
 //        outFontIdentifier->fStyle = fontRec.fStyle;
     }
     if (NULL != outFamilyName) {
         if (exactNameMatch) {
             outFamilyName->set(familyName);
         } else {
             // find familyName from list of names
             const char* familyName = NULL;
             SkAssertResult(fFamilyNameDict.findKey(familyRecID, &familyName));
             SkASSERT(familyName);
             outFamilyName->set(familyName);
         }
     }
     if (NULL != outStyle) {
         *outStyle = fontRec.fStyle;
     }
     return true;
 }
 SkStream* SkFontConfigInterfaceAndroid::openStream(const FontIdentity& identity) {
     return SkStream::NewFromFile(identity.fString.c_str());
 }
 SkDataTable* SkFontConfigInterfaceAndroid::getFamilyNames() {
     SkTDArray<const char*> names;
     SkTDArray<size_t> sizes;
     SkTDict<FamilyRecID>::Iter iter(fFamilyNameDict);
     const char* familyName = iter.next(NULL);
     while(familyName != NULL) {
         *names.append() = familyName;
         *sizes.append() = strlen(familyName) + 1;
         // move to the next familyName in the dictionary
         familyName = iter.next(NULL);
     }
     return SkDataTable::NewCopyArrays((const void*const*)names.begin(),
                                       sizes.begin(), names.count());
 }
 bool SkFontConfigInterfaceAndroid::matchFamilySet(const char inFamilyName[],
                                                   SkString* outFamilyName,
                                                   SkTArray<FontIdentity>*) {
     return false;
 }
 static bool find_proc(SkTypeface* face, SkTypeface::Style style, void* ctx) {
     const FontRecID* fontRecID = (const FontRecID*)ctx;
     FontRecID currFontRecID = ((FontConfigTypeface*)face)->getIdentity().fID;
     return currFontRecID == *fontRecID;
 }
 SkTypeface* SkFontConfigInterfaceAndroid::getTypefaceForFontRec(FontRecID fontRecID) {
     FontRec& fontRec = fFonts[fontRecID];
     SkTypeface* face = fontRec.fTypeface.get();
     if (!face) {
         // look for it in the typeface cache
         face = SkTypefaceCache::FindByProcAndRef(find_proc, &fontRecID);
         // if it is not in the cache then create it
         if (!face) {
             const char* familyName = NULL;
             SkAssertResult(fFamilyNameDict.findKey(fontRec.fFamilyRecID, &familyName));
             SkASSERT(familyName);
             face = SkTypeface::CreateFromName(familyName, fontRec.fStyle);
         }
         // store the result for subsequent lookups
         fontRec.fTypeface = face;
     }
     SkASSERT(face);
     return face;
 }
 bool SkFontConfigInterfaceAndroid::getFallbackFamilyNameForChar(SkUnichar uni,
                                                                 const char* lang,
                                                                 SkString* name) {
     FallbackFontList* fallbackFontList = NULL;
     const SkString langTag(lang);
     if (langTag.isEmpty()) {
         fallbackFontList = this->getCurrentLocaleFallbackFontList();
     } else {
         fallbackFontList = this->findFallbackFontList(langTag);
     }
     for (int i = 0; i < fallbackFontList->count(); i++) {
         FamilyRecID familyRecID = fallbackFontList->getAt(i);
         // if it is not one of the accepted variants then move to the next family
         int32_t acceptedVariants = SkPaintOptionsAndroid::kDefault_Variant |
                                    SkPaintOptionsAndroid::kElegant_Variant;
         if (!(fFontFamilies[familyRecID].fPaintOptions.getFontVariant() & acceptedVariants)) {
             continue;
         }
         FontRecID fontRecID = find_best_style(fFontFamilies[familyRecID], SkTypeface::kNormal);
         SkTypeface* face = this->getTypefaceForFontRec(fontRecID);
         SkPaint paint;
         paint.setTypeface(face);
         paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
         uint16_t glyphID;
         paint.textToGlyphs(&uni, sizeof(uni), &glyphID);
         if (glyphID != 0) {
             name->set(fFontFamilies[familyRecID].fFallbackName);
             return true;
         }
     }
     return false;
 }
 SkTypeface* SkFontConfigInterfaceAndroid::getTypefaceForChar(SkUnichar uni,
                                                              SkTypeface::Style style,
                                                              SkPaintOptionsAndroid::FontVariant fontVariant) {
     FontRecID fontRecID = find_best_style(fFontFamilies[fDefaultFamilyRecID], style);
     SkTypeface* face = this->getTypefaceForFontRec(fontRecID);
     SkPaintOptionsAndroid paintOptions;
     paintOptions.setFontVariant(fontVariant);
     paintOptions.setUseFontFallbacks(true);
     SkPaint paint;
     paint.setTypeface(face);
     paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
     paint.setPaintOptionsAndroid(paintOptions);
     SkAutoGlyphCache autoCache(paint, NULL, NULL);
     SkGlyphCache*    cache = autoCache.getCache();
     SkScalerContext* ctx = cache->getScalerContext();
     if (ctx) {
         SkFontID fontID = ctx->findTypefaceIdForChar(uni);
         return SkTypefaceCache::FindByID(fontID);
     }
     return NULL;
 }
 FallbackFontList* SkFontConfigInterfaceAndroid::getCurrentLocaleFallbackFontList() {
     SkString locale = SkFontConfigParser::GetLocale();
     if (NULL == fLocaleFallbackFontList || locale != fCachedLocale) {
         fCachedLocale = locale;
         fLocaleFallbackFontList = this->findFallbackFontList(locale);
     }
     return fLocaleFallbackFontList;
 }
 FallbackFontList* SkFontConfigInterfaceAndroid::findFallbackFontList(const SkLanguage& lang,
                                                                      bool isOriginal) {
     const SkString& langTag = lang.getTag();
     if (langTag.isEmpty()) {
         return &fDefaultFallbackList;
     }
     FallbackFontList* fallbackFontList;
     if (fFallbackFontDict.find(langTag.c_str(), langTag.size(), &fallbackFontList) ||
         fFallbackFontAliasDict.find(langTag.c_str(), langTag.size(), &fallbackFontList)) {
         return fallbackFontList;
     }
     // attempt a recursive fuzzy match
     SkLanguage parent = lang.getParent();
     fallbackFontList = findFallbackFontList(parent, false);
     // cache the original lang so we don't have to do the recursion again.
     if (isOriginal) {
         DEBUG_FONT(("----  Created fallback list alias for \"%s\"", langTag.c_str()));
         fFallbackFontAliasDict.set(langTag.c_str(), fallbackFontList);
     }
     return fallbackFontList;
 }
 SkTypeface* SkFontConfigInterfaceAndroid::nextLogicalTypeface(SkFontID currFontID,
                                                               SkFontID origFontID,
                                                               const SkPaintOptionsAndroid& opts) {
     // Skia does not support font fallback by default. This enables clients such
     // as WebKit to customize their font selection. In any case, clients can use
     // GetFallbackFamilyNameForChar() to get the fallback font for individual
     // characters.
     if (!opts.isUsingFontFallbacks()) {
         return NULL;
     }
     FallbackFontList* currentFallbackList = findFallbackFontList(opts.getLanguage());
     SkASSERT(currentFallbackList);
     SkTypeface::Style origStyle = SkTypeface::kNormal;
     const SkTypeface* origTypeface = SkTypefaceCache::FindByID(origFontID);
     if (NULL != origTypeface) {
         origStyle = origTypeface->style();
     }
     // we must convert currTypeface into a FontRecID
     FontRecID currFontRecID = INVALID_FONT_REC_ID;
     const SkTypeface* currTypeface = SkTypefaceCache::FindByID(currFontID);
     // non-system fonts are not in the font cache so if we are asked to fallback
     // for a non-system font we will start at the front of the chain.
     if (NULL != currTypeface) {
         currFontRecID = ((FontConfigTypeface*)currTypeface)->getIdentity().fID;
         SkASSERT(INVALID_FONT_REC_ID != currFontRecID);
     }
     FamilyRecID currFamilyRecID = INVALID_FAMILY_REC_ID;
     if (INVALID_FONT_REC_ID != currFontRecID) {
         currFamilyRecID = fFonts[currFontRecID].fFamilyRecID;
     }
     // lookup the index next font in the chain
     int currFallbackFontIndex = currentFallbackList->find(currFamilyRecID);
     // We add 1 to the returned index for 2 reasons: (1) if find succeeds it moves
     // our index to the next entry in the list; (2) if find() fails it returns
     // -1 and incrementing it will set our starting index to 0 (the head of the list)
     int nextFallbackFontIndex = currFallbackFontIndex + 1;
     if(nextFallbackFontIndex >= currentFallbackList->count()) {
         return NULL;
     }
     // If a rec object is set to prefer "kDefault_Variant" it means they have no preference
     // In this case, we set the value to "kCompact_Variant"
     SkPaintOptionsAndroid::FontVariant variant = opts.getFontVariant();
     if (variant == SkPaintOptionsAndroid::kDefault_Variant) {
         variant = SkPaintOptionsAndroid::kCompact_Variant;
     }
     int32_t acceptedVariants = SkPaintOptionsAndroid::kDefault_Variant | variant;
     SkTypeface* nextLogicalTypeface = 0;
     while (nextFallbackFontIndex < currentFallbackList->count()) {
         FamilyRecID familyRecID = currentFallbackList->getAt(nextFallbackFontIndex);
         if ((fFontFamilies[familyRecID].fPaintOptions.getFontVariant() & acceptedVariants) != 0) {
             FontRecID matchedFont = find_best_style(fFontFamilies[familyRecID], origStyle);
             nextLogicalTypeface = this->getTypefaceForFontRec(matchedFont);
             break;
         }
         nextFallbackFontIndex++;
     }
     DEBUG_FONT(("---- nextLogicalFont: currFontID=%d, origFontID=%d, currRecID=%d, "
                 "lang=%s, variant=%d, nextFallbackIndex[%d,%d] => nextLogicalTypeface=%d",
                 currFontID, origFontID, currFontRecID, opts.getLanguage().getTag().c_str(),
                 variant, nextFallbackFontIndex, currentFallbackList->getAt(nextFallbackFontIndex),
                 (nextLogicalTypeface) ? nextLogicalTypeface->uniqueID() : 0));
     return SkSafeRef(nextLogicalTypeface);
 }
 SkTypeface* SkFontConfigInterfaceAndroid::getTypefaceForGlyphID(uint16_t glyphID,
                                                                 const SkTypeface* origTypeface,
                                                                 const SkPaintOptionsAndroid& opts,
                                                                 int* lBounds, int* uBounds) {
     // If we aren't using fallbacks then we shouldn't be calling this
     SkASSERT(opts.isUsingFontFallbacks());
     SkASSERT(origTypeface);
     SkTypeface* currentTypeface = NULL;
     int lowerBounds = 0; //inclusive
     int upperBounds = origTypeface->countGlyphs(); //exclusive
     // check to see if the glyph is in the bounds of the origTypeface
     if (glyphID < upperBounds) {
         currentTypeface = const_cast<SkTypeface*>(origTypeface);
     } else {
         FallbackFontList* currentFallbackList = findFallbackFontList(opts.getLanguage());
         SkASSERT(currentFallbackList);
         // If an object is set to prefer "kDefault_Variant" it means they have no preference
         // In this case, we set the value to "kCompact_Variant"
         SkPaintOptionsAndroid::FontVariant variant = opts.getFontVariant();
         if (variant == SkPaintOptionsAndroid::kDefault_Variant) {
             variant = SkPaintOptionsAndroid::kCompact_Variant;
         }
         int32_t acceptedVariants = SkPaintOptionsAndroid::kDefault_Variant | variant;
         SkTypeface::Style origStyle = origTypeface->style();
         for (int x = 0; x < currentFallbackList->count(); ++x) {
             const FamilyRecID familyRecID = currentFallbackList->getAt(x);
             const SkPaintOptionsAndroid& familyOptions = fFontFamilies[familyRecID].fPaintOptions;
             if ((familyOptions.getFontVariant() & acceptedVariants) != 0) {
                 FontRecID matchedFont = find_best_style(fFontFamilies[familyRecID], origStyle);
                 currentTypeface = this->getTypefaceForFontRec(matchedFont);
                 lowerBounds = upperBounds;
                 upperBounds += currentTypeface->countGlyphs();
                 if (glyphID < upperBounds) {
                     break;
                 }
             }
         }
     }
     if (NULL != currentTypeface) {
         if (lBounds) {
             *lBounds = lowerBounds;
         }
         if (uBounds) {
             *uBounds = upperBounds;
         }
     }
     return currentTypeface;
 }
 ///////////////////////////////////////////////////////////////////////////////
 bool SkGetFallbackFamilyNameForChar(SkUnichar uni, SkString* name) {
     SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
     return fontConfig->getFallbackFamilyNameForChar(uni, NULL, name);
 }
 bool SkGetFallbackFamilyNameForChar(SkUnichar uni, const char* lang, SkString* name) {
     SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
     return fontConfig->getFallbackFamilyNameForChar(uni, lang, name);
 }
 void SkUseTestFontConfigFile(const char* mainconf, const char* fallbackconf,
                              const char* fontsdir) {
     gTestMainConfigFile = mainconf;
     gTestFallbackConfigFile = fallbackconf;
     gTestFontFilePrefix = fontsdir;
     SkASSERT(gTestMainConfigFile);
     SkASSERT(gTestFallbackConfigFile);
     SkASSERT(gTestFontFilePrefix);
     SkDEBUGF(("Use Test Config File Main %s, Fallback %s, Font Dir %s",
               gTestMainConfigFile, gTestFallbackConfigFile, gTestFontFilePrefix));
 }
 SkTypeface* SkAndroidNextLogicalTypeface(SkFontID currFontID, SkFontID origFontID,
                                          const SkPaintOptionsAndroid& options) {
     SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
     return fontConfig->nextLogicalTypeface(currFontID, origFontID, options);
 }
 SkTypeface* SkGetTypefaceForGlyphID(uint16_t glyphID, const SkTypeface* origTypeface,
                                     const SkPaintOptionsAndroid& options,
                                     int* lowerBounds, int* upperBounds) {
     SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
     return fontConfig->getTypefaceForGlyphID(glyphID, origTypeface, options,
                                              lowerBounds, upperBounds);
 }
 ///////////////////////////////////////////////////////////////////////////////
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
 struct HB_UnicodeMapping {
     hb_script_t script;
     const SkUnichar unicode;
 };
 /*
  * The following scripts are not complex fonts and we do not expect them to be parsed by this table
  * HB_SCRIPT_COMMON,
  * HB_SCRIPT_GREEK,
  * HB_SCRIPT_CYRILLIC,
  * HB_SCRIPT_HANGUL
  * HB_SCRIPT_INHERITED
  */
 /* Harfbuzz (old) is missing a number of scripts in its table. For these,
  * we include a value which can never happen. We won't get complex script
  * shaping in these cases, but the library wouldn't know how to shape
  * them anyway. */
 #define HB_Script_Unknown HB_ScriptCount
 static HB_UnicodeMapping HB_UnicodeMappingArray[] = {
     {HB_SCRIPT_ARMENIAN,    0x0531},
     {HB_SCRIPT_HEBREW,      0x0591},
     {HB_SCRIPT_ARABIC,      0x0600},
     {HB_SCRIPT_SYRIAC,      0x0710},
     {HB_SCRIPT_THAANA,      0x0780},
     {HB_SCRIPT_NKO,         0x07C0},
     {HB_SCRIPT_DEVANAGARI,  0x0901},
     {HB_SCRIPT_BENGALI,     0x0981},
     {HB_SCRIPT_GURMUKHI,    0x0A10},
     {HB_SCRIPT_GUJARATI,    0x0A90},
     {HB_SCRIPT_ORIYA,       0x0B10},
     {HB_SCRIPT_TAMIL,       0x0B82},
     {HB_SCRIPT_TELUGU,      0x0C10},
     {HB_SCRIPT_KANNADA,     0x0C90},
     {HB_SCRIPT_MALAYALAM,   0x0D10},
     {HB_SCRIPT_SINHALA,     0x0D90},
     {HB_SCRIPT_THAI,        0x0E01},
     {HB_SCRIPT_LAO,         0x0E81},
     {HB_SCRIPT_TIBETAN,     0x0F00},
     {HB_SCRIPT_MYANMAR,     0x1000},
     {HB_SCRIPT_GEORGIAN,    0x10A0},
     {HB_SCRIPT_ETHIOPIC,    0x1200},
     {HB_SCRIPT_CHEROKEE,    0x13A0},
     {HB_SCRIPT_OGHAM,       0x1680},
     {HB_SCRIPT_RUNIC,       0x16A0},
     {HB_SCRIPT_KHMER,       0x1780},
     {HB_SCRIPT_TAI_LE,      0x1950},
     {HB_SCRIPT_NEW_TAI_LUE, 0x1980},
     {HB_SCRIPT_TAI_THAM,    0x1A20},
     {HB_SCRIPT_CHAM,        0xAA00},
 };
 // returns 0 for "Not Found"
 static SkUnichar getUnicodeFromHBScript(hb_script_t script) {
     SkUnichar unichar = 0;
     int numSupportedFonts = sizeof(HB_UnicodeMappingArray) / sizeof(HB_UnicodeMapping);
     for (int i = 0; i < numSupportedFonts; i++) {
         if (script == HB_UnicodeMappingArray[i].script) {
             unichar = HB_UnicodeMappingArray[i].unicode;
             break;
         }
     }
     return unichar;
 }
 struct TypefaceLookupStruct {
     hb_script_t script;
     SkTypeface::Style style;
     SkPaintOptionsAndroid::FontVariant fontVariant;
     SkTypeface* typeface;
 };
 SK_DECLARE_STATIC_MUTEX(gTypefaceTableMutex);  // This is the mutex for gTypefaceTable
 static SkTDArray<TypefaceLookupStruct> gTypefaceTable;  // This is protected by gTypefaceTableMutex
 static int typefaceLookupCompare(const TypefaceLookupStruct& first,
                                  const TypefaceLookupStruct& second) {
     if (first.script != second.script) {
         return (first.script > second.script) ? 1 : -1;
     }
     if (first.style != second.style) {
         return (first.style > second.style) ? 1 : -1;
     }
     if (first.fontVariant != second.fontVariant) {
         return (first.fontVariant > second.fontVariant) ? 1 : -1;
     }
     return 0;
 }
 SkTypeface* SkCreateTypefaceForScript(hb_script_t script, SkTypeface::Style style,
                                       SkPaintOptionsAndroid::FontVariant fontVariant) {
     SkAutoMutexAcquire ac(gTypefaceTableMutex);
     TypefaceLookupStruct key;
     key.script = script;
     key.style = style;
     key.fontVariant = fontVariant;
     int index = SkTSearch<TypefaceLookupStruct>(
             (const TypefaceLookupStruct*) gTypefaceTable.begin(),
             gTypefaceTable.count(), key, sizeof(TypefaceLookupStruct),
             typefaceLookupCompare);
     SkTypeface* retTypeface = NULL;
     if (index >= 0) {
         retTypeface = gTypefaceTable[index].typeface;
     }
     else {
         SkUnichar unichar = getUnicodeFromHBScript(script);
         if (!unichar) {
             return NULL;
         }
         SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
         retTypeface = fontConfig->getTypefaceForChar(unichar, style, fontVariant);
         // add to the lookup table
         key.typeface = retTypeface;
         *gTypefaceTable.insert(~index) = key;
     }
     // we ref(), the caller is expected to unref when they are done
     return SkSafeRef(retTypeface);
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////
 SkFontMgr* SkFontMgr::Factory() {
     return NULL;
 }

The Tor Browser / annotate

gfx/skia/trunk/src/ports/SkFontConfigInterface_android.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/ports/SkFontConfigInterface_android.cpp