FontCollection.h revision 13f1aae02bacd475722bc8ea3fc2cf6abc1a82e3 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef MINIKIN_FONT_COLLECTION_H
18#define MINIKIN_FONT_COLLECTION_H
19
20#include <vector>
21
22#include <minikin/MinikinRefCounted.h>
23#include <minikin/MinikinFont.h>
24#include <minikin/FontFamily.h>
25
26namespace android {
27
28class FontCollection : public MinikinRefCounted {
29public:
30    explicit FontCollection(const std::vector<FontFamily*>& typefaces);
31
32    ~FontCollection();
33
34    struct Run {
35        FakedFont fakedFont;
36        int start;
37        int end;
38    };
39
40    void itemize(const uint16_t *string, size_t string_length, FontStyle style,
41            std::vector<Run>* result) const;
42
43    // Get the base font for the given style, useful for font-wide metrics.
44    MinikinFont* baseFont(FontStyle style);
45
46    // Get base font with fakery information (fake bold could affect metrics)
47    FakedFont baseFontFaked(FontStyle style);
48
49    uint32_t getId() const;
50private:
51    static const int kLogCharsPerPage = 8;
52    static const int kPageMask = (1 << kLogCharsPerPage) - 1;
53
54    struct Range {
55        size_t start;
56        size_t end;
57    };
58
59    FontFamily* getFamilyForChar(uint32_t ch, FontLanguage lang, int variant) const;
60
61    // static for allocating unique id's
62    static uint32_t sNextId;
63
64    // unique id for this font collection (suitable for cache key)
65    uint32_t mId;
66
67    // Highest UTF-32 code point that can be mapped
68    uint32_t mMaxChar;
69
70    // This vector has ownership of the bitsets and typeface objects.
71    std::vector<FontFamily*> mFamilies;
72
73    // This vector contains pointers into mInstances
74    std::vector<FontFamily*> mFamilyVec;
75
76    // These are offsets into mInstanceVec, one range per page
77    std::vector<Range> mRanges;
78};
79
80}  // namespace android
81
82#endif  // MINIKIN_FONT_COLLECTION_H
83