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

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

gfx/skia/trunk/src/ports/SkFontHost_android_old.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 2006 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 "SkFontDescriptor.h"
 #include "SkFontHost.h"
 #include "SkFontHost_FreeType_common.h"
 #include "SkDescriptor.h"
 #include "SkStream.h"
 #include "SkPaint.h"
 #include "SkString.h"
 #include "SkStream.h"
 #include "SkThread.h"
 #include "SkTSearch.h"
 #include <stdio.h>
 #define FONT_CACHE_MEMORY_BUDGET    (768 * 1024)
 #ifndef SK_FONT_FILE_PREFIX
     #define SK_FONT_FILE_PREFIX          "/fonts/"
 #endif
 bool find_name_and_attributes(SkStream* stream, SkString* name, SkTypeface::Style* style,
                                            bool* isFixedWidth);
 static void GetFullPathForSysFonts(SkString* full, const char name[]) {
     full->set(getenv("ANDROID_ROOT"));
     full->append(SK_FONT_FILE_PREFIX);
     full->append(name);
 }
 ///////////////////////////////////////////////////////////////////////////////
 struct FamilyRec;
 /*  This guy holds a mapping of a name -> family, used for looking up fonts.
     Since it is stored in a stretchy array that doesn't preserve object
     semantics, we don't use constructor/destructors, but just have explicit
     helpers to manage our internal bookkeeping.
 */
 struct NameFamilyPair {
     const char* fName;      // we own this
     FamilyRec*  fFamily;    // we don't own this, we just reference it
     void construct(const char name[], FamilyRec* family) {
         fName = strdup(name);
         fFamily = family;   // we don't own this, so just record the referene
     }
     void destruct() {
         free((char*)fName);
         // we don't own family, so just ignore our reference
     }
 };
 // we use atomic_inc to grow this for each typeface we create
 static int32_t gUniqueFontID;
 // this is the mutex that protects these globals
 static SkMutex gFamilyMutex;
 static FamilyRec* gFamilyHead;
 static SkTDArray<NameFamilyPair> gNameList;
 struct FamilyRec {
     FamilyRec*  fNext;
     SkTypeface* fFaces[4];
     FamilyRec()
     {
         fNext = gFamilyHead;
         memset(fFaces, 0, sizeof(fFaces));
         gFamilyHead = this;
     }
 };
 static SkTypeface* find_best_face(const FamilyRec* family,
                                   SkTypeface::Style style) {
     SkTypeface* const* faces = family->fFaces;
     if (faces[style] != NULL) { // exact match
         return faces[style];
     }
     // look for a matching bold
     style = (SkTypeface::Style)(style ^ SkTypeface::kItalic);
     if (faces[style] != NULL) {
         return faces[style];
     }
     // look for the plain
     if (faces[SkTypeface::kNormal] != NULL) {
         return faces[SkTypeface::kNormal];
     }
     // look for anything
     for (int i = 0; i < 4; i++) {
         if (faces[i] != NULL) {
             return faces[i];
         }
     }
     // should never get here, since the faces list should not be empty
     SkASSERT(!"faces list is empty");
     return NULL;
 }
 static FamilyRec* find_family(const SkTypeface* member) {
     FamilyRec* curr = gFamilyHead;
     while (curr != NULL) {
         for (int i = 0; i < 4; i++) {
             if (curr->fFaces[i] == member) {
                 return curr;
             }
         }
         curr = curr->fNext;
     }
     return NULL;
 }
 /*  Returns the matching typeface, or NULL. If a typeface is found, its refcnt
     is not modified.
  */
 static SkTypeface* find_from_uniqueID(uint32_t uniqueID) {
     FamilyRec* curr = gFamilyHead;
     while (curr != NULL) {
         for (int i = 0; i < 4; i++) {
             SkTypeface* face = curr->fFaces[i];
             if (face != NULL && face->uniqueID() == uniqueID) {
                 return face;
             }
         }
         curr = curr->fNext;
     }
     return NULL;
 }
 /*  Remove reference to this face from its family. If the resulting family
     is empty (has no faces), return that family, otherwise return NULL
 */
 static FamilyRec* remove_from_family(const SkTypeface* face) {
     FamilyRec* family = find_family(face);
     SkASSERT(family->fFaces[face->style()] == face);
     family->fFaces[face->style()] = NULL;
     for (int i = 0; i < 4; i++) {
         if (family->fFaces[i] != NULL) {    // family is non-empty
             return NULL;
         }
     }
     return family;  // return the empty family
 }
 // maybe we should make FamilyRec be doubly-linked
 static void detach_and_delete_family(FamilyRec* family) {
     FamilyRec* curr = gFamilyHead;
     FamilyRec* prev = NULL;
     while (curr != NULL) {
         FamilyRec* next = curr->fNext;
         if (curr == family) {
             if (prev == NULL) {
                 gFamilyHead = next;
             } else {
                 prev->fNext = next;
             }
             SkDELETE(family);
             return;
         }
         prev = curr;
         curr = next;
     }
     SkASSERT(!"Yikes, couldn't find family in our list to remove/delete");
 }
 static SkTypeface* find_typeface(const char name[], SkTypeface::Style style) {
     NameFamilyPair* list = gNameList.begin();
     int             count = gNameList.count();
     int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
     if (index >= 0) {
         return find_best_face(list[index].fFamily, style);
     }
     return NULL;
 }
 static SkTypeface* find_typeface(const SkTypeface* familyMember,
                                  SkTypeface::Style style) {
     const FamilyRec* family = find_family(familyMember);
     return family ? find_best_face(family, style) : NULL;
 }
 static void add_name(const char name[], FamilyRec* family) {
     SkAutoAsciiToLC tolc(name);
     name = tolc.lc();
     NameFamilyPair* list = gNameList.begin();
     int             count = gNameList.count();
     int index = SkStrLCSearch(&list[0].fName, count, name, sizeof(list[0]));
     if (index < 0) {
         list = gNameList.insert(~index);
         list->construct(name, family);
     }
 }
 static void remove_from_names(FamilyRec* emptyFamily)
 {
 #ifdef SK_DEBUG
     for (int i = 0; i < 4; i++) {
         SkASSERT(emptyFamily->fFaces[i] == NULL);
     }
 #endif
     SkTDArray<NameFamilyPair>& list = gNameList;
     // must go backwards when removing
     for (int i = list.count() - 1; i >= 0; --i) {
         NameFamilyPair* pair = &list[i];
         if (pair->fFamily == emptyFamily) {
             pair->destruct();
             list.remove(i);
         }
     }
 }
 ///////////////////////////////////////////////////////////////////////////////
 class FamilyTypeface : public SkTypeface_FreeType {
 public:
     FamilyTypeface(Style style, bool sysFont, SkTypeface* familyMember,
                    bool isFixedWidth)
     : SkTypeface_FreeType(style, sk_atomic_inc(&gUniqueFontID) + 1, isFixedWidth) {
         fIsSysFont = sysFont;
         SkAutoMutexAcquire  ac(gFamilyMutex);
         FamilyRec* rec = NULL;
         if (familyMember) {
             rec = find_family(familyMember);
             SkASSERT(rec);
         } else {
             rec = SkNEW(FamilyRec);
         }
         rec->fFaces[style] = this;
     }
     virtual ~FamilyTypeface() {
         SkAutoMutexAcquire  ac(gFamilyMutex);
         // remove us from our family. If the family is now empty, we return
         // that and then remove that family from the name list
         FamilyRec* family = remove_from_family(this);
         if (NULL != family) {
             remove_from_names(family);
             detach_and_delete_family(family);
         }
     }
     bool isSysFont() const { return fIsSysFont; }
     virtual const char* getUniqueString() const = 0;
     virtual const char* getFilePath() const = 0;
 protected:
     virtual void onGetFontDescriptor(SkFontDescriptor*, bool*) const SK_OVERRIDE;
 private:
     bool    fIsSysFont;
     typedef SkTypeface INHERITED;
 };
 ///////////////////////////////////////////////////////////////////////////////
 class StreamTypeface : public FamilyTypeface {
 public:
     StreamTypeface(Style style, bool sysFont, SkTypeface* familyMember,
                    SkStream* stream, bool isFixedWidth)
     : INHERITED(style, sysFont, familyMember, isFixedWidth) {
         SkASSERT(stream);
         stream->ref();
         fStream = stream;
     }
     virtual ~StreamTypeface() {
         fStream->unref();
     }
     // overrides
     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
         *ttcIndex = 0;
         // we just ref our existing stream, since the caller will call unref()
         // when they are through
         fStream->ref();
         // must rewind each time, since the caller assumes a "new" stream
         fStream->rewind();
         return fStream;
     }
     virtual const char* getUniqueString() const { return NULL; }
     virtual const char* getFilePath() const { return NULL; }
 private:
     SkStream* fStream;
     typedef FamilyTypeface INHERITED;
 };
 class FileTypeface : public FamilyTypeface {
 public:
     FileTypeface(Style style, bool sysFont, SkTypeface* familyMember,
                  const char path[], bool isFixedWidth)
     : INHERITED(style, sysFont, familyMember, isFixedWidth) {
         SkString fullpath;
         if (sysFont) {
             GetFullPathForSysFonts(&fullpath, path);
             path = fullpath.c_str();
         }
         fPath.set(path);
     }
     // overrides
     virtual SkStream* onOpenStream(int* ttcIndex) const SK_OVERRIDE {
         *ttcIndex = 0;
         SkStream* stream = SkNEW_ARGS(SkFILEStream, (fPath.c_str()));
         // check for failure
         if (stream->getLength() <= 0) {
             SkDELETE(stream);
             stream = NULL;
         }
         return stream;
     }
     virtual const char* getUniqueString() const {
         const char* str = strrchr(fPath.c_str(), '/');
         if (str) {
             str += 1;   // skip the '/'
         }
         return str;
     }
     virtual const char* getFilePath() const {
         return fPath.c_str();
     }
 private:
     SkString fPath;
     typedef FamilyTypeface INHERITED;
 };
 ///////////////////////////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////////////////////////
 static bool get_name_and_style(const char path[], SkString* name,
                                SkTypeface::Style* style,
                                bool* isFixedWidth, bool isExpected) {
     SkString        fullpath;
     GetFullPathForSysFonts(&fullpath, path);
     SkAutoTUnref<SkStream> stream(SkStream::NewFromFile(fullpath.c_str()));
     if (stream.get()) {
         find_name_and_attributes(stream, name, style, isFixedWidth);
         return true;
     }
     if (isExpected) {
         SkDebugf("---- failed to open <%s> as a font\n", fullpath.c_str());
     }
     return false;
 }
 // used to record our notion of the pre-existing fonts
 struct FontInitRec {
     const char*         fFileName;
     const char* const*  fNames;     // null-terminated list
 };
 static const char* gSansNames[] = {
     "sans-serif", "arial", "helvetica", "tahoma", "verdana", NULL
 };
 static const char* gSerifNames[] = {
     "serif", "times", "times new roman", "palatino", "georgia", "baskerville",
     "goudy", "fantasy", "cursive", "ITC Stone Serif", NULL
 };
 static const char* gMonoNames[] = {
     "monospace", "courier", "courier new", "monaco", NULL
 };
 // deliberately empty, but we use the address to identify fallback fonts
 static const char* gFBNames[] = { NULL };
 /*  Fonts must be grouped by family, with the first font in a family having the
     list of names (even if that list is empty), and the following members having
     null for the list. The names list must be NULL-terminated
 */
 static const FontInitRec gSystemFonts[] = {
     { "DroidSans.ttf",              gSansNames  },
     { "DroidSans-Bold.ttf",         NULL        },
     { "DroidSerif-Regular.ttf",     gSerifNames },
     { "DroidSerif-Bold.ttf",        NULL        },
     { "DroidSerif-Italic.ttf",      NULL        },
     { "DroidSerif-BoldItalic.ttf",  NULL        },
     { "DroidSansMono.ttf",          gMonoNames  },
     /*  These are optional, and can be ignored if not found in the file system.
         These are appended to gFallbackFonts[] as they are seen, so we list
         them in the order we want them to be accessed by NextLogicalFont().
      */
     { "DroidSansArabic.ttf",        gFBNames    },
     { "DroidSansHebrew.ttf",        gFBNames    },
     { "DroidSansThai.ttf",          gFBNames    },
     { "MTLmr3m.ttf",                gFBNames    }, // Motoya Japanese Font
     { "MTLc3m.ttf",                 gFBNames    }, // Motoya Japanese Font
     { "DroidSansJapanese.ttf",      gFBNames    },
     { "DroidSansFallback.ttf",      gFBNames    }
 };
 #define DEFAULT_NAMES   gSansNames
 // these globals are assigned (once) by load_system_fonts()
 static FamilyRec* gDefaultFamily;
 static SkTypeface* gDefaultNormal;
 /*  This is sized conservatively, assuming that it will never be a size issue.
     It will be initialized in load_system_fonts(), and will be filled with the
     fontIDs that can be used for fallback consideration, in sorted order (sorted
     meaning element[0] should be used first, then element[1], etc. When we hit
     a fontID==0 in the array, the list is done, hence our allocation size is
     +1 the total number of possible system fonts. Also see NextLogicalFont().
  */
 static uint32_t gFallbackFonts[SK_ARRAY_COUNT(gSystemFonts)+1];
 /*  Called once (ensured by the sentinel check at the beginning of our body).
     Initializes all the globals, and register the system fonts.
  */
 static void load_system_fonts() {
     // check if we've already be called
     if (NULL != gDefaultNormal) {
         return;
     }
     const FontInitRec* rec = gSystemFonts;
     SkTypeface* firstInFamily = NULL;
     int fallbackCount = 0;
     for (size_t i = 0; i < SK_ARRAY_COUNT(gSystemFonts); i++) {
         // if we're the first in a new family, clear firstInFamily
         if (rec[i].fNames != NULL) {
             firstInFamily = NULL;
         }
         bool isFixedWidth;
         SkString name;
         SkTypeface::Style style;
         // we expect all the fonts, except the "fallback" fonts
         bool isExpected = (rec[i].fNames != gFBNames);
         if (!get_name_and_style(rec[i].fFileName, &name, &style,
                                 &isFixedWidth, isExpected)) {
             continue;
         }
         SkTypeface* tf = SkNEW_ARGS(FileTypeface,
                                     (style,
                                      true,  // system-font (cannot delete)
                                      firstInFamily, // what family to join
                                      rec[i].fFileName,
                                      isFixedWidth) // filename
                                     );
         if (rec[i].fNames != NULL) {
             // see if this is one of our fallback fonts
             if (rec[i].fNames == gFBNames) {
             //    SkDebugf("---- adding %s as fallback[%d] fontID %d\n",
             //             rec[i].fFileName, fallbackCount, tf->uniqueID());
                 gFallbackFonts[fallbackCount++] = tf->uniqueID();
             }
             firstInFamily = tf;
             FamilyRec* family = find_family(tf);
             const char* const* names = rec[i].fNames;
             // record the default family if this is it
             if (names == DEFAULT_NAMES) {
                 gDefaultFamily = family;
             }
             // add the names to map to this family
             while (*names) {
                 add_name(*names, family);
                 names += 1;
             }
         }
     }
     // do this after all fonts are loaded. This is our default font, and it
     // acts as a sentinel so we only execute load_system_fonts() once
     gDefaultNormal = find_best_face(gDefaultFamily, SkTypeface::kNormal);
     // now terminate our fallback list with the sentinel value
     gFallbackFonts[fallbackCount] = 0;
 }
 void FamilyTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                          bool* isLocalStream) const {
     {
         SkAutoMutexAcquire ac(gFamilyMutex);
         //desc->setFamilyName(find_family_name(this));
         desc->setFontFileName(this->getUniqueString());
     }
     *isLocalStream = !this->isSysFont();
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
                                        const char familyName[],
                                        SkTypeface::Style style) {
     load_system_fonts();
     SkAutoMutexAcquire  ac(gFamilyMutex);
     // clip to legal style bits
     style = (SkTypeface::Style)(style & SkTypeface::kBoldItalic);
     SkTypeface* tf = NULL;
     if (NULL != familyFace) {
         tf = find_typeface(familyFace, style);
     } else if (NULL != familyName) {
 //        SkDebugf("======= familyName <%s>\n", familyName);
         tf = find_typeface(familyName, style);
     }
     if (NULL == tf) {
         tf = find_best_face(gDefaultFamily, style);
     }
     // we ref(), since the symantic is to return a new instance
     tf->ref();
     return tf;
 }
 SkTypeface* SkAndroidNextLogicalTypeface(SkFontID currFontID, SkFontID origFontID,
                                          const SkPaintOptionsAndroid& options) {
     load_system_fonts();
     /*  First see if fontID is already one of our fallbacks. If so, return
         its successor. If fontID is not in our list, then return the first one
         in our list. Note: list is zero-terminated, and returning zero means
         we have no more fonts to use for fallbacks.
      */
     const uint32_t* list = gFallbackFonts;
     for (int i = 0; list[i] != 0; i++) {
         if (list[i] == currFontID) {
             return find_from_uniqueID(list[i+1]);
         }
     }
     return find_from_uniqueID(list[0]);
 }
 ///////////////////////////////////////////////////////////////////////////////
 SkTypeface* SkFontHost::CreateTypefaceFromStream(SkStream* stream) {
     if (NULL == stream || stream->getLength() <= 0) {
         return NULL;
     }
     bool isFixedWidth;
     SkString name;
     SkTypeface::Style style;
     find_name_and_attributes(stream, &name, &style, &isFixedWidth);
     if (!name.isEmpty()) {
         return SkNEW_ARGS(StreamTypeface, (style, false, NULL, stream, isFixedWidth));
     } else {
         return NULL;
     }
 }
 SkTypeface* SkFontHost::CreateTypefaceFromFile(const char path[]) {
     SkStream* stream = SkNEW_ARGS(SkFILEStream, (path));
     SkTypeface* face = SkFontHost::CreateTypefaceFromStream(stream);
     // since we created the stream, we let go of our ref() here
     stream->unref();
     return face;
 }

The Tor Browser / annotate

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

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