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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkFontMgr_indirect_DEFINED
      9 #define SkFontMgr_indirect_DEFINED
     10 
     11 #include "../private/SkMutex.h"
     12 #include "../private/SkTArray.h"
     13 #include "SkDataTable.h"
     14 #include "SkFontMgr.h"
     15 #include "SkRefCnt.h"
     16 #include "SkRemotableFontMgr.h"
     17 #include "SkTypeface.h"
     18 #include "SkTypes.h"
     19 
     20 class SkData;
     21 class SkFontStyle;
     22 class SkStreamAsset;
     23 class SkString;
     24 
     25 class SK_API SkFontMgr_Indirect : public SkFontMgr {
     26 public:
     27     // TODO: The SkFontMgr is only used for createFromStream/File/Data.
     28     // In the future these calls should be broken out into their own interface
     29     // with a name like SkFontRenderer.
     30     SkFontMgr_Indirect(SkFontMgr* impl, SkRemotableFontMgr* proxy)
     31         : fImpl(SkRef(impl)), fProxy(SkRef(proxy)), fFamilyNamesInited(false)
     32     { }
     33 
     34 protected:
     35     int onCountFamilies() const override;
     36     void onGetFamilyName(int index, SkString* familyName) const override;
     37     SkFontStyleSet* onCreateStyleSet(int index) const override;
     38 
     39     SkFontStyleSet* onMatchFamily(const char familyName[]) const override;
     40 
     41     virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
     42                                            const SkFontStyle& fontStyle) const override;
     43 
     44     virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
     45                                                     const SkFontStyle&,
     46                                                     const char* bcp47[],
     47                                                     int bcp47Count,
     48                                                     SkUnichar character) const override;
     49 
     50     virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
     51                                          const SkFontStyle& fontStyle) const override;
     52 
     53     SkTypeface* onCreateFromStream(SkStreamAsset* stream, int ttcIndex) const override;
     54     SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override;
     55     SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override;
     56 
     57     virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
     58                                                unsigned styleBits) const override;
     59 
     60 private:
     61     SkTypeface* createTypefaceFromFontId(const SkFontIdentity& fontId) const;
     62 
     63     SkAutoTUnref<SkFontMgr> fImpl;
     64     SkAutoTUnref<SkRemotableFontMgr> fProxy;
     65 
     66     struct DataEntry {
     67         uint32_t fDataId;  // key1
     68         uint32_t fTtcIndex;  // key2
     69         SkTypeface* fTypeface;  // value: weak ref to typeface
     70 
     71         DataEntry() { }
     72 
     73         DataEntry(DataEntry&& that)
     74             : fDataId(that.fDataId)
     75             , fTtcIndex(that.fTtcIndex)
     76             , fTypeface(that.fTypeface)
     77         {
     78             SkDEBUGCODE(that.fDataId = SkFontIdentity::kInvalidDataId;)
     79             SkDEBUGCODE(that.fTtcIndex = 0xbbadbeef;)
     80             that.fTypeface = NULL;
     81         }
     82 
     83         ~DataEntry() {
     84             if (fTypeface) {
     85                 fTypeface->weak_unref();
     86             }
     87         }
     88     };
     89     /**
     90      *  This cache is essentially { dataId: { ttcIndex: typeface } }
     91      *  For data caching we want a mapping from data id to weak references to
     92      *  typefaces with that data id. By storing the index next to the typeface,
     93      *  this data cache also acts as a typeface cache.
     94      */
     95     mutable SkTArray<DataEntry> fDataCache;
     96     mutable SkMutex fDataCacheMutex;
     97 
     98     mutable SkAutoTUnref<SkDataTable> fFamilyNames;
     99     mutable bool fFamilyNamesInited;
    100     mutable SkMutex fFamilyNamesMutex;
    101     static void set_up_family_names(const SkFontMgr_Indirect* self);
    102 
    103     friend class SkStyleSet_Indirect;
    104 };
    105 
    106 #endif
    107