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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/SkOnce.h"
     13 #include "../private/SkTArray.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(sk_sp<SkFontMgr> impl, sk_sp<SkRemotableFontMgr> proxy)
     31         : fImpl(std::move(impl)), fProxy(std::move(proxy))
     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     SkTypeface* onMatchFamilyStyle(const char familyName[],
     42                                    const SkFontStyle& fontStyle) const override;
     43 
     44     SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
     45                                             const SkFontStyle&,
     46                                             const char* bcp47[],
     47                                             int bcp47Count,
     48                                             SkUnichar character) const override;
     49 
     50     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     SkTypeface* onLegacyCreateTypeface(const char familyName[], SkFontStyle) const override;
     58 
     59 private:
     60     SkTypeface* createTypefaceFromFontId(const SkFontIdentity& fontId) const;
     61 
     62     sk_sp<SkFontMgr> fImpl;
     63     sk_sp<SkRemotableFontMgr> fProxy;
     64 
     65     struct DataEntry {
     66         uint32_t fDataId;  // key1
     67         uint32_t fTtcIndex;  // key2
     68         SkTypeface* fTypeface;  // value: weak ref to typeface
     69 
     70         DataEntry() { }
     71 
     72         DataEntry(DataEntry&& that)
     73             : fDataId(that.fDataId)
     74             , fTtcIndex(that.fTtcIndex)
     75             , fTypeface(that.fTypeface)
     76         {
     77             SkDEBUGCODE(that.fDataId = SkFontIdentity::kInvalidDataId;)
     78             SkDEBUGCODE(that.fTtcIndex = 0xbbadbeef;)
     79             that.fTypeface = NULL;
     80         }
     81 
     82         ~DataEntry() {
     83             if (fTypeface) {
     84                 fTypeface->weak_unref();
     85             }
     86         }
     87     };
     88     /**
     89      *  This cache is essentially { dataId: { ttcIndex: typeface } }
     90      *  For data caching we want a mapping from data id to weak references to
     91      *  typefaces with that data id. By storing the index next to the typeface,
     92      *  this data cache also acts as a typeface cache.
     93      */
     94     mutable SkTArray<DataEntry> fDataCache;
     95     mutable SkMutex fDataCacheMutex;
     96 
     97     friend class SkStyleSet_Indirect;
     98 };
     99 
    100 #endif
    101