Line data Source code
1 : /*
2 : * Copyright 2013 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_DEFINED
9 : #define SkFontMgr_DEFINED
10 :
11 : #include "SkFontArguments.h"
12 : #include "SkFontStyle.h"
13 : #include "SkRefCnt.h"
14 : #include "SkTypes.h"
15 :
16 : class SkData;
17 : class SkFontData;
18 : class SkStreamAsset;
19 : class SkString;
20 : class SkTypeface;
21 :
22 0 : class SK_API SkFontStyleSet : public SkRefCnt {
23 : public:
24 : virtual int count() = 0;
25 : virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0;
26 : virtual SkTypeface* createTypeface(int index) = 0;
27 : virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0;
28 :
29 : static SkFontStyleSet* CreateEmpty();
30 :
31 : protected:
32 : SkTypeface* matchStyleCSS3(const SkFontStyle& pattern);
33 :
34 : private:
35 : typedef SkRefCnt INHERITED;
36 : };
37 :
38 0 : class SK_API SkFontMgr : public SkRefCnt {
39 : public:
40 : int countFamilies() const;
41 : void getFamilyName(int index, SkString* familyName) const;
42 : SkFontStyleSet* createStyleSet(int index) const;
43 :
44 : /**
45 : * The caller must call unref() on the returned object.
46 : * Never returns NULL; will return an empty set if the name is not found.
47 : *
48 : * Passing |nullptr| as the parameter will return the default system font.
49 : *
50 : * It is possible that this will return a style set not accessible from
51 : * createStyleSet(int) due to hidden or auto-activated fonts.
52 : */
53 : SkFontStyleSet* matchFamily(const char familyName[]) const;
54 :
55 : /**
56 : * Find the closest matching typeface to the specified familyName and style
57 : * and return a ref to it. The caller must call unref() on the returned
58 : * object. Will never return NULL, as it will return the default font if
59 : * no matching font is found.
60 : *
61 : * Passing |nullptr| as the parameter for |familyName| will return the
62 : * default system font.
63 : *
64 : * It is possible that this will return a style set not accessible from
65 : * createStyleSet(int) or matchFamily(const char[]) due to hidden or
66 : * auto-activated fonts.
67 : */
68 : SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&) const;
69 :
70 : /**
71 : * Use the system fallback to find a typeface for the given character.
72 : * Note that bcp47 is a combination of ISO 639, 15924, and 3166-1 codes,
73 : * so it is fine to just pass a ISO 639 here.
74 : *
75 : * Will return NULL if no family can be found for the character
76 : * in the system fallback.
77 : *
78 : * Passing |nullptr| as the parameter for |familyName| will return the
79 : * default system font.
80 : *
81 : * bcp47[0] is the least significant fallback, bcp47[bcp47Count-1] is the
82 : * most significant. If no specified bcp47 codes match, any font with the
83 : * requested character will be matched.
84 : */
85 : SkTypeface* matchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
86 : const char* bcp47[], int bcp47Count,
87 : SkUnichar character) const;
88 :
89 : SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&) const;
90 :
91 : /**
92 : * Create a typeface for the specified data and TTC index (pass 0 for none)
93 : * or NULL if the data is not recognized. The caller must call unref() on
94 : * the returned object if it is not null.
95 : */
96 : SkTypeface* createFromData(SkData*, int ttcIndex = 0) const;
97 :
98 : /**
99 : * Create a typeface for the specified stream and TTC index
100 : * (pass 0 for none) or NULL if the stream is not recognized. The caller
101 : * must call unref() on the returned object if it is not null.
102 : */
103 : SkTypeface* createFromStream(SkStreamAsset*, int ttcIndex = 0) const;
104 :
105 : // deprecated, use SkFontArguments instead.
106 : using FontParameters = SkFontArguments;
107 : /* Experimental, API subject to change. */
108 : SkTypeface* createFromStream(SkStreamAsset*, const SkFontArguments&) const;
109 :
110 : /**
111 : * Create a typeface from the specified font data.
112 : * Will return NULL if the typeface could not be created.
113 : * The caller must call unref() on the returned object if it is not null.
114 : */
115 : SkTypeface* createFromFontData(std::unique_ptr<SkFontData>) const;
116 :
117 : /**
118 : * Create a typeface for the specified fileName and TTC index
119 : * (pass 0 for none) or NULL if the file is not found, or its contents are
120 : * not recognized. The caller must call unref() on the returned object
121 : * if it is not null.
122 : */
123 : SkTypeface* createFromFile(const char path[], int ttcIndex = 0) const;
124 :
125 : SkTypeface* legacyCreateTypeface(const char familyName[], SkFontStyle style) const;
126 :
127 : /** Return the default fontmgr. */
128 : static sk_sp<SkFontMgr> RefDefault();
129 :
130 : protected:
131 : virtual int onCountFamilies() const = 0;
132 : virtual void onGetFamilyName(int index, SkString* familyName) const = 0;
133 : virtual SkFontStyleSet* onCreateStyleSet(int index)const = 0;
134 :
135 : /** May return NULL if the name is not found. */
136 : virtual SkFontStyleSet* onMatchFamily(const char familyName[]) const = 0;
137 :
138 : virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
139 : const SkFontStyle&) const = 0;
140 : virtual SkTypeface* onMatchFamilyStyleCharacter(const char familyName[], const SkFontStyle&,
141 : const char* bcp47[], int bcp47Count,
142 : SkUnichar character) const = 0;
143 : virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
144 : const SkFontStyle&) const = 0;
145 :
146 : virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) const = 0;
147 : virtual SkTypeface* onCreateFromStream(SkStreamAsset*, int ttcIndex) const = 0;
148 : // TODO: make pure virtual.
149 : virtual SkTypeface* onCreateFromStream(SkStreamAsset*, const SkFontArguments&) const;
150 : virtual SkTypeface* onCreateFromFontData(std::unique_ptr<SkFontData>) const;
151 : virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) const = 0;
152 :
153 : virtual SkTypeface* onLegacyCreateTypeface(const char familyName[], SkFontStyle) const = 0;
154 :
155 : private:
156 :
157 : /** Implemented by porting layer to return the default factory. */
158 : static sk_sp<SkFontMgr> Factory();
159 :
160 : typedef SkRefCnt INHERITED;
161 : };
162 :
163 : #endif
|
