MinikinFont.h revision 5986f6048ae21e0ec094c1f2ca0169d0ca6ec6b5 
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_H
18#define MINIKIN_FONT_H
19
20#include <string>
21
22#include <minikin/MinikinRefCounted.h>
23#include <minikin/FontFamily.h>
24
25// An abstraction for platform fonts, allowing Minikin to be used with
26// multiple actual implementations of fonts.
27
28namespace android {
29
30class MinikinFont;
31
32// Possibly move into own .h file?
33// Note: if you add a field here, either add it to LayoutCacheKey or to skipCache()
34struct MinikinPaint {
35    MinikinPaint() : font(0), size(0), scaleX(0), skewX(0), letterSpacing(0), paintFlags(0),
36            fakery(), fontFeatureSettings() { }
37
38    bool skipCache() const {
39      return !fontFeatureSettings.empty();
40    }
41
42    MinikinFont *font;
43    float size;
44    float scaleX;
45    float skewX;
46    float letterSpacing;
47    uint32_t paintFlags;
48    FontFakery fakery;
49    std::string fontFeatureSettings;
50};
51
52struct MinikinRect {
53    float mLeft, mTop, mRight, mBottom;
54    bool isEmpty() const {
55        return mLeft == mRight || mTop == mBottom;
56    }
57    void set(const MinikinRect& r) {
58        mLeft = r.mLeft;
59        mTop = r.mTop;
60        mRight = r.mRight;
61        mBottom = r.mBottom;
62    }
63    void offset(float dx, float dy) {
64        mLeft += dx;
65        mTop += dy;
66        mRight += dx;
67        mBottom += dy;
68    }
69    void setEmpty() {
70        mLeft = mTop = mRight = mBottom = 0;
71    }
72    void join(const MinikinRect& r);
73};
74
75class MinikinFontFreeType;
76
77class MinikinFont : public MinikinRefCounted {
78public:
79    virtual bool GetGlyph(uint32_t codepoint, uint32_t *glyph) const = 0;
80
81    virtual float GetHorizontalAdvance(uint32_t glyph_id,
82        const MinikinPaint &paint) const = 0;
83
84    virtual void GetBounds(MinikinRect* bounds, uint32_t glyph_id,
85        const MinikinPaint &paint) const = 0;
86
87    // If buf is NULL, just update size
88    virtual bool GetTable(uint32_t tag, uint8_t *buf, size_t *size) = 0;
89
90    virtual int32_t GetUniqueId() const = 0;
91
92    static uint32_t MakeTag(char c1, char c2, char c3, char c4) {
93        return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) |
94            ((uint32_t)c3 << 8) | (uint32_t)c4;
95    }
96};
97
98}  // namespace android
99
100#endif  // MINIKIN_FONT_H
101