MinikinFont.h revision bcc3dc5a2591a95a57e379e27cbad69c18e91e67
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// An abstraction for platform fonts, allowing Minikin to be used with 21// multiple actual implementations of fonts. 22 23namespace android { 24 25class MinikinFont; 26 27// Possibly move into own .h file? 28struct MinikinPaint { 29 MinikinFont *font; 30 float size; 31 // todo: skew, stretch, hinting 32}; 33 34class MinikinFontFreeType; 35 36class MinikinFont { 37public: 38 void Ref() { mRefcount_++; } 39 void Unref() { if (--mRefcount_ == 0) { delete this; } } 40 41 //MinikinFont(); 42 virtual ~MinikinFont() = 0; 43 44 virtual bool GetGlyph(uint32_t codepoint, uint32_t *glyph) const = 0; 45 46 virtual float GetHorizontalAdvance(uint32_t glyph_id, 47 const MinikinPaint &paint) const = 0; 48 49 // If buf is NULL, just update size 50 virtual bool GetTable(uint32_t tag, uint8_t *buf, size_t *size) = 0; 51 52 virtual int32_t GetUniqueId() const = 0; 53 54 static uint32_t MakeTag(char c1, char c2, char c3, char c4) { 55 return ((uint32_t)c1 << 24) | ((uint32_t)c2 << 16) | 56 ((uint32_t)c3 << 8) | (uint32_t)c4; 57 } 58 59 // This is used to implement a downcast without RTTI 60 virtual MinikinFontFreeType* GetFreeType() { 61 return NULL; 62 } 63 64private: 65 int mRefcount_; 66}; 67 68} // namespace android 69 70#endif // MINIKIN_FONT_H 71