SkFontMgr.h revision 114cfbd10ec2d91aa60fcc60a795c45d5b8345ae 
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 "SkRefCnt.h"
12#include "SkFontStyle.h"
13
14class SkData;
15class SkStream;
16class SkString;
17class SkTypeface;
18
19class SK_API SkFontStyleSet : public SkRefCnt {
20public:
21    SK_DECLARE_INST_COUNT(SkFontStyleSet)
22
23    virtual int count() = 0;
24    virtual void getStyle(int index, SkFontStyle*, SkString* style) = 0;
25    virtual SkTypeface* createTypeface(int index) = 0;
26    virtual SkTypeface* matchStyle(const SkFontStyle& pattern) = 0;
27
28    static SkFontStyleSet* CreateEmpty();
29
30private:
31    typedef SkRefCnt INHERITED;
32};
33
34class SK_API SkFontMgr : public SkRefCnt {
35public:
36    SK_DECLARE_INST_COUNT(SkFontMgr)
37
38    int countFamilies();
39    void getFamilyName(int index, SkString* familyName);
40    SkFontStyleSet* createStyleSet(int index);
41
42    SkFontStyleSet* matchFamily(const char familyName[]);
43
44    /**
45     *  Find the closest matching typeface to the specified familyName and style
46     *  and return a ref to it. The caller must call unref() on the returned
47     *  object. Will never return NULL, as it will return the default font if
48     *  no matching font is found.
49     */
50    SkTypeface* matchFamilyStyle(const char familyName[], const SkFontStyle&);
51
52    SkTypeface* matchFaceStyle(const SkTypeface*, const SkFontStyle&);
53
54    /**
55     *  Create a typeface for the specified data and TTC index (pass 0 for none)
56     *  or NULL if the data is not recognized. The caller must call unref() on
57     *  the returned object if it is not null.
58     */
59    SkTypeface* createFromData(SkData*, int ttcIndex = 0);
60
61    /**
62     *  Create a typeface for the specified stream and TTC index
63     *  (pass 0 for none) or NULL if the stream is not recognized. The caller
64     *  must call unref() on the returned object if it is not null.
65     */
66    SkTypeface* createFromStream(SkStream*, int ttcIndex = 0);
67
68    /**
69     *  Create a typeface for the specified fileName and TTC index
70     *  (pass 0 for none) or NULL if the file is not found, or its contents are
71     *  not recognized. The caller must call unref() on the returned object
72     *  if it is not null.
73     */
74    SkTypeface* createFromFile(const char path[], int ttcIndex = 0);
75
76    /**
77     *  Return a ref to the default fontmgr. The caller must call unref() on
78     *  the returned object.
79     */
80    static SkFontMgr* RefDefault();
81
82protected:
83    virtual int onCountFamilies() = 0;
84    virtual void onGetFamilyName(int index, SkString* familyName) = 0;
85    virtual SkFontStyleSet* onCreateStyleSet(int index) = 0;
86
87    virtual SkFontStyleSet* onMatchFamily(const char familyName[]) = 0;
88
89    virtual SkTypeface* onMatchFamilyStyle(const char familyName[],
90                                           const SkFontStyle&) = 0;
91    virtual SkTypeface* onMatchFaceStyle(const SkTypeface*,
92                                         const SkFontStyle&) = 0;
93
94    virtual SkTypeface* onCreateFromData(SkData*, int ttcIndex) = 0;
95    virtual SkTypeface* onCreateFromStream(SkStream*, int ttcIndex) = 0;
96    virtual SkTypeface* onCreateFromFile(const char path[], int ttcIndex) = 0;
97
98private:
99    static SkFontMgr* Factory();    // implemented by porting layer
100
101    typedef SkRefCnt INHERITED;
102};
103
104#endif
105