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 28 namespace android { 29 30 class 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() 34 struct MinikinPaint { MinikinPaintMinikinPaint35 MinikinPaint() : font(0), size(0), scaleX(0), skewX(0), letterSpacing(0), paintFlags(0), 36 fakery(), fontFeatureSettings() { } 37 skipCacheMinikinPaint38 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 52 // Only a few flags affect layout, but those that do should have values 53 // consistent with Android's paint flags. 54 enum MinikinPaintFlags { 55 LinearTextFlag = 0x40, 56 }; 57 58 struct MinikinRect { 59 float mLeft, mTop, mRight, mBottom; isEmptyMinikinRect60 bool isEmpty() const { 61 return mLeft == mRight || mTop == mBottom; 62 } setMinikinRect63 void set(const MinikinRect& r) { 64 mLeft = r.mLeft; 65 mTop = r.mTop; 66 mRight = r.mRight; 67 mBottom = r.mBottom; 68 } offsetMinikinRect69 void offset(float dx, float dy) { 70 mLeft += dx; 71 mTop += dy; 72 mRight += dx; 73 mBottom += dy; 74 } setEmptyMinikinRect75 void setEmpty() { 76 mLeft = mTop = mRight = mBottom = 0; 77 } 78 void join(const MinikinRect& r); 79 }; 80 81 class MinikinFontFreeType; 82 83 class MinikinFont : public MinikinRefCounted { 84 public: 85 virtual bool GetGlyph(uint32_t codepoint, uint32_t *glyph) const = 0; 86 87 virtual float GetHorizontalAdvance(uint32_t glyph_id, 88 const MinikinPaint &paint) const = 0; 89 90 virtual void GetBounds(MinikinRect* bounds, uint32_t glyph_id, 91 const MinikinPaint &paint) const = 0; 92 93 // If buf is NULL, just update size 94 virtual bool GetTable(uint32_t tag, uint8_t *buf, size_t *size) = 0; 95 96 virtual int32_t GetUniqueId() const = 0; 97 MakeTag(char c1,char c2,char c3,char c4)98 static uint32_t MakeTag(char c1, char c2, char c3, char c4) { 99 return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) | 100 ((uint32_t)c3 << 8) | (uint32_t)c4; 101 } 102 }; 103 104 } // namespace android 105 106 #endif // MINIKIN_FONT_H 107