FontCollection.h revision 9cc9bbe1461f359f0b27c5e7645c17dda001ab1d 
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 <ft2build.h>
23#include FT_FREETYPE_H
24#include FT_TRUETYPE_TABLES_H
25
26#include "SparseBitSet.h"
27#include "FontFamily.h"
28
29namespace android {
30
31class FontCollection {
32public:
33    explicit FontCollection(const std::vector<FontFamily*>& typefaces);
34
35    ~FontCollection();
36
37    const FontFamily* getFamilyForChar(uint32_t ch) const;
38    class Run {
39    public:
40        // Do copy constructor, assignment, destructor so it can be used in vectors
41        Run() : font(NULL) { }
42        Run(const Run& other): font(other.font), start(other.start), end(other.end) {
43            if (font) FT_Reference_Face(font);
44        }
45        Run& operator=(const Run& other) {
46            if (other.font) FT_Reference_Face(other.font);
47            if (font) FT_Done_Face(font);
48            font = other.font;
49            start = other.start;
50            end = other.end;
51            return *this;
52        }
53        ~Run() { if (font) FT_Done_Face(font); }
54
55        FT_Face font;
56        int start;
57        int end;
58    };
59    void itemize(const uint16_t *string, size_t string_length, FontStyle style,
60            std::vector<Run>* result) const;
61    private:
62    static const int kLogCharsPerPage = 8;
63    static const int kPageMask = (1 << kLogCharsPerPage) - 1;
64
65    struct FontInstance {
66        SparseBitSet* mCoverage;
67        FontFamily* mFamily;
68    };
69
70    struct Range {
71        size_t start;
72        size_t end;
73    };
74
75    // Highest UTF-32 code point that can be mapped
76    uint32_t mMaxChar;
77
78    // This vector has ownership of the bitsets and typeface objects.
79    std::vector<FontInstance> mInstances;
80
81    // This vector contains pointers into mInstances
82    std::vector<const FontInstance*> mInstanceVec;
83
84    // These are offsets into mInstanceVec, one range per page
85    std::vector<Range> mRanges;
86};
87
88}  // namespace android
89
90#endif  // MINIKIN_FONT_COLLECTION_H
91