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 "include/core/SkFontMgr.h"
12#include "include/core/SkRefCnt.h"
13#include "include/core/SkTypeface.h"
14#include "include/core/SkTypes.h"
15#include "include/ports/SkRemotableFontMgr.h"
16#include "include/private/SkMutex.h"
17#include "include/private/SkOnce.h"
18#include "include/private/SkTArray.h"
19
20class SkData;
21class SkFontStyle;
22class SkStreamAsset;
23class SkString;
24
25class SK_API SkFontMgr_Indirect : public SkFontMgr {
26public:
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
34protected:
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    sk_sp<SkTypeface> onMakeFromStreamIndex(std::unique_ptr<SkStreamAsset>, int ttcIndex) const override;
51    sk_sp<SkTypeface> onMakeFromStreamArgs(std::unique_ptr<SkStreamAsset> stream,
52                                           const SkFontArguments& args) const override;
53    sk_sp<SkTypeface> onMakeFromFile(const char path[], int ttcIndex) const override;
54    sk_sp<SkTypeface> onMakeFromData(sk_sp<SkData>, int ttcIndex) const override;
55    sk_sp<SkTypeface> onLegacyMakeTypeface(const char familyName[], SkFontStyle) const override;
56
57private:
58    SkTypeface* createTypefaceFromFontId(const SkFontIdentity& fontId) const;
59
60    sk_sp<SkFontMgr> fImpl;
61    sk_sp<SkRemotableFontMgr> fProxy;
62
63    struct DataEntry {
64        uint32_t fDataId;  // key1
65        uint32_t fTtcIndex;  // key2
66        SkTypeface* fTypeface;  // value: weak ref to typeface
67
68        DataEntry() = default;
69
70        DataEntry(DataEntry&& that) { *this = std::move(that); }
71        DataEntry& operator=(DataEntry&& that) {
72            if (this != &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 = nullptr;
80            }
81            return *this;
82        }
83
84        ~DataEntry() {
85            if (fTypeface) {
86                fTypeface->weak_unref();
87            }
88        }
89    };
90    /**
91     *  This cache is essentially { dataId: { ttcIndex: typeface } }
92     *  For data caching we want a mapping from data id to weak references to
93     *  typefaces with that data id. By storing the index next to the typeface,
94     *  this data cache also acts as a typeface cache.
95     */
96    mutable SkTArray<DataEntry> fDataCache;
97    mutable SkMutex fDataCacheMutex;
98
99    friend class SkStyleSet_Indirect;
100};
101
102#endif
103