Font.h revision 874f5c6e4ac655b4f118074c90d51e6a44abe50c 
1/*
2 * Copyright (C) 2012 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 ANDROID_HWUI_FONT_H
18#define ANDROID_HWUI_FONT_H
19
20#include <utils/KeyedVector.h>
21
22#include <SkScalerContext.h>
23#include <SkPaint.h>
24#include <SkPathMeasure.h>
25
26#include "CachedGlyphInfo.h"
27#include "../Rect.h"
28#include "../Matrix.h"
29
30namespace android {
31namespace uirenderer {
32
33///////////////////////////////////////////////////////////////////////////////
34// Font
35///////////////////////////////////////////////////////////////////////////////
36
37class FontRenderer;
38
39/**
40 * Represents a font, defined by a Skia font id and a font size. A font is used
41 * to generate glyphs and cache them in the FontState.
42 */
43class Font {
44public:
45    enum Style {
46        kFakeBold = 1
47    };
48
49    struct FontDescription {
50        FontDescription(const SkPaint* paint, const mat4& matrix);
51
52        static int compare(const FontDescription& lhs, const FontDescription& rhs);
53
54        hash_t hash() const;
55
56        bool operator==(const FontDescription& other) const {
57            return compare(*this, other) == 0;
58        }
59
60        bool operator!=(const FontDescription& other) const {
61            return compare(*this, other) != 0;
62        }
63
64        SkFontID mFontId;
65        float mFontSize;
66        int mFlags;
67        float mItalicStyle;
68        float mScaleX;
69        uint8_t mStyle;
70        float mStrokeWidth;
71        bool mAntiAliasing;
72        SkMatrix mLookupTransform;
73        SkMatrix mInverseLookupTransform;
74    };
75
76    ~Font();
77
78    void render(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
79            int numGlyphs, int x, int y, const float* positions);
80
81    void render(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
82            int numGlyphs, SkPath* path, float hOffset, float vOffset);
83
84    const Font::FontDescription& getDescription() const {
85        return mDescription;
86    }
87
88    /**
89     * Creates a new font associated with the specified font state.
90     */
91    static Font* create(FontRenderer* state, const SkPaint* paint, const mat4& matrix);
92
93private:
94    friend class FontRenderer;
95
96    Font(FontRenderer* state, const Font::FontDescription& desc);
97
98    typedef void (Font::*RenderGlyph)(CachedGlyphInfo*, int, int, uint8_t*,
99            uint32_t, uint32_t, Rect*, const float*);
100
101    enum RenderMode {
102        FRAMEBUFFER,
103        BITMAP,
104        MEASURE,
105    };
106
107    void precache(SkPaint* paint, const char* text, int numGlyphs);
108
109    void render(SkPaint* paint, const char *text, uint32_t start, uint32_t len,
110            int numGlyphs, int x, int y, RenderMode mode, uint8_t *bitmap,
111            uint32_t bitmapW, uint32_t bitmapH, Rect *bounds, const float* positions);
112
113    void measure(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
114            int numGlyphs, Rect *bounds, const float* positions);
115
116    void invalidateTextureCache(CacheTexture* cacheTexture = NULL);
117
118    CachedGlyphInfo* cacheGlyph(SkPaint* paint, glyph_t glyph, bool precaching);
119    void updateGlyphCache(SkPaint* paint, const SkGlyph& skiaGlyph, CachedGlyphInfo* glyph,
120            bool precaching);
121
122    void measureCachedGlyph(CachedGlyphInfo* glyph, int x, int y,
123            uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
124            Rect* bounds, const float* pos);
125    void drawCachedGlyph(CachedGlyphInfo* glyph, int x, int y,
126            uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
127            Rect* bounds, const float* pos);
128    void drawCachedGlyphPerspective(CachedGlyphInfo* glyph, int x, int y,
129            uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
130            Rect* bounds, const float* pos);
131    void drawCachedGlyphBitmap(CachedGlyphInfo* glyph, int x, int y,
132            uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
133            Rect* bounds, const float* pos);
134    void drawCachedGlyph(CachedGlyphInfo* glyph, float x, float hOffset, float vOffset,
135            SkPathMeasure& measure, SkPoint* position, SkVector* tangent);
136
137    CachedGlyphInfo* getCachedGlyph(SkPaint* paint, glyph_t textUnit, bool precaching = false);
138
139    FontRenderer* mState;
140    FontDescription mDescription;
141
142    // Cache of glyphs
143    DefaultKeyedVector<glyph_t, CachedGlyphInfo*> mCachedGlyphs;
144
145    mat4 mTransform;
146};
147
148inline int strictly_order_type(const Font::FontDescription& lhs,
149        const Font::FontDescription& rhs) {
150    return Font::FontDescription::compare(lhs, rhs) < 0;
151}
152
153inline int compare_type(const Font::FontDescription& lhs, const Font::FontDescription& rhs) {
154    return Font::FontDescription::compare(lhs, rhs);
155}
156
157inline hash_t hash_type(const Font::FontDescription& entry) {
158    return entry.hash();
159}
160
161}; // namespace uirenderer
162}; // namespace android
163
164#endif // ANDROID_HWUI_FONT_H
165