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 "SkDataTable.h"
12#include "SkFontMgr.h"
13#include "SkFontStyle.h"
14#include "SkRemotableFontMgr.h"
15#include "SkTArray.h"
16#include "SkTypeface.h"
17
18class SkData;
19class SkStream;
20class SkString;
21class SkTypeface;
22
23class SK_API SkFontMgr_Indirect : public SkFontMgr {
24public:
25    // TODO: The SkFontMgr is only used for createFromStream/File/Data.
26    // In the future these calls should be broken out into their own interface
27    // with a name like SkFontRenderer.
28    SkFontMgr_Indirect(SkFontMgr* impl, SkRemotableFontMgr* proxy)
29        : fImpl(SkRef(impl)), fProxy(SkRef(proxy)), fFamilyNamesInited(false)
30    { }
31
32protected:
33    int onCountFamilies() const override;
34    void onGetFamilyName(int index, SkString* familyName) const override;
35    SkFontStyleSet* onCreateStyleSet(int index) const override;
36
37    SkFontStyleSet* onMatchFamily(const char familyName[]) const override;
38
39    virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
40                                           const SkFontStyle& fontStyle) const override;
41
42    virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[],
43                                                    const SkFontStyle&,
44                                                    const char* bcp47[],
45                                                    int bcp47Count,
46                                                    SkUnichar character) const override;
47
48    virtual SkTypeface* onMatchFaceStyle(const SkTypeface* familyMember,
49                                         const SkFontStyle& fontStyle) const override;
50
51    SkTypeface* onCreateFromStream(SkStreamAsset* stream, int ttcIndex) const override;
52    SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const override;
53    SkTypeface* onCreateFromData(SkData* data, int ttcIndex) const override;
54
55    virtual SkTypeface* onLegacyCreateTypeface(const char familyName[],
56                                               unsigned styleBits) const override;
57
58private:
59    SkTypeface* createTypefaceFromFontId(const SkFontIdentity& fontId) const;
60
61    SkAutoTUnref<SkFontMgr> fImpl;
62    SkAutoTUnref<SkRemotableFontMgr> fProxy;
63
64    struct DataEntry {
65        uint32_t fDataId;  // key1
66        uint32_t fTtcIndex;  // key2
67        SkTypeface* fTypeface;  // value: weak ref to typeface
68
69        DataEntry() { }
70
71        // This is a move!!!
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    mutable SkAutoTUnref<SkDataTable> fFamilyNames;
98    mutable bool fFamilyNamesInited;
99    mutable SkMutex fFamilyNamesMutex;
100    static void set_up_family_names(const SkFontMgr_Indirect* self);
101
102    friend class SkStyleSet_Indirect;
103};
104
105#endif
106