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