MinikinFont.h revision 83d5a3c53d77c34fbeac7012ab3612933982d494 
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 <minikin/MinikinRefCounted.h>
21#include <minikin/FontFamily.h>
22
23// An abstraction for platform fonts, allowing Minikin to be used with
24// multiple actual implementations of fonts.
25
26namespace android {
27
28class MinikinFont;
29
30// Possibly move into own .h file?
31// Note: if you add a field here, also update LayoutCacheKey
32struct MinikinPaint {
33    MinikinPaint() : font(0), size(0), scaleX(0), skewX(0), letterSpacing(0), paintFlags(0),
34            fakery() { }
35    MinikinFont *font;
36    float size;
37    float scaleX;
38    float skewX;
39    float letterSpacing;
40    uint32_t paintFlags;
41    FontFakery fakery;
42};
43
44struct MinikinRect {
45    float mLeft, mTop, mRight, mBottom;
46    bool isEmpty() const {
47        return mLeft == mRight || mTop == mBottom;
48    }
49    void set(const MinikinRect& r) {
50        mLeft = r.mLeft;
51        mTop = r.mTop;
52        mRight = r.mRight;
53        mBottom = r.mBottom;
54    }
55    void offset(float dx, float dy) {
56        mLeft += dx;
57        mTop += dy;
58        mRight += dx;
59        mBottom += dy;
60    }
61    void setEmpty() {
62        mLeft = mTop = mRight = mBottom = 0;
63    }
64    void join(const MinikinRect& r);
65};
66
67class MinikinFontFreeType;
68
69class MinikinFont : public MinikinRefCounted {
70public:
71    virtual bool GetGlyph(uint32_t codepoint, uint32_t *glyph) const = 0;
72
73    virtual float GetHorizontalAdvance(uint32_t glyph_id,
74        const MinikinPaint &paint) const = 0;
75
76    virtual void GetBounds(MinikinRect* bounds, uint32_t glyph_id,
77        const MinikinPaint &paint) const = 0;
78
79    // If buf is NULL, just update size
80    virtual bool GetTable(uint32_t tag, uint8_t *buf, size_t *size) = 0;
81
82    virtual int32_t GetUniqueId() const = 0;
83
84    static uint32_t MakeTag(char c1, char c2, char c3, char c4) {
85        return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) |
86            ((uint32_t)c3 << 8) | (uint32_t)c4;
87    }
88};
89
90}  // namespace android
91
92#endif  // MINIKIN_FONT_H
93