1 /* 2 * Copyright (C) 2014 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 /** 18 * Utilities for making Minikin work, especially from existing objects like 19 * Paint and so on. 20 **/ 21 22 // TODO: does this really need to be separate from MinikinSkia? 23 24 #ifndef _ANDROID_GRAPHICS_MINIKIN_UTILS_H_ 25 #define _ANDROID_GRAPHICS_MINIKIN_UTILS_H_ 26 27 #include <cutils/compiler.h> 28 #include <minikin/Layout.h> 29 #include "MinikinSkia.h" 30 #include "Paint.h" 31 #include "Typeface.h" 32 #include <log/log.h> 33 34 namespace minikin { 35 class MeasuredText; 36 } // namespace minikin 37 38 namespace android { 39 40 class MinikinUtils { 41 public: 42 ANDROID_API static minikin::MinikinPaint prepareMinikinPaint(const Paint* paint, 43 const Typeface* typeface); 44 45 ANDROID_API static minikin::Layout doLayout(const Paint* paint, minikin::Bidi bidiFlags, 46 const Typeface* typeface, const uint16_t* buf, 47 size_t start, size_t count, size_t bufSize, 48 minikin::MeasuredText* mt); 49 50 ANDROID_API static float measureText(const Paint* paint, minikin::Bidi bidiFlags, 51 const Typeface* typeface, const uint16_t* buf, 52 size_t start, size_t count, size_t bufSize, 53 float* advances); 54 55 ANDROID_API static bool hasVariationSelector(const Typeface* typeface, uint32_t codepoint, 56 uint32_t vs); 57 58 ANDROID_API static float xOffsetForTextAlign(Paint* paint, const minikin::Layout& layout); 59 60 ANDROID_API static float hOffsetForTextAlign(Paint* paint, const minikin::Layout& layout, 61 const SkPath& path); 62 // f is a functor of type void f(size_t start, size_t end); 63 template <typename F> 64 ANDROID_API static void forFontRun(const minikin::Layout& layout, Paint* paint, F& f) { 65 float saveSkewX = paint->getTextSkewX(); 66 bool savefakeBold = paint->isFakeBoldText(); 67 const minikin::MinikinFont* curFont = nullptr; 68 size_t start = 0; 69 size_t nGlyphs = layout.nGlyphs(); 70 for (size_t i = 0; i < nGlyphs; i++) { 71 const minikin::MinikinFont* nextFont = layout.getFont(i); 72 if (i > 0 && nextFont != curFont) { 73 MinikinFontSkia::populateSkPaint(paint, curFont, layout.getFakery(start)); 74 f(start, i); 75 paint->setTextSkewX(saveSkewX); 76 paint->setFakeBoldText(savefakeBold); 77 start = i; 78 } 79 curFont = nextFont; 80 } 81 if (nGlyphs > start) { 82 MinikinFontSkia::populateSkPaint(paint, curFont, layout.getFakery(start)); 83 f(start, nGlyphs); 84 paint->setTextSkewX(saveSkewX); 85 paint->setFakeBoldText(savefakeBold); 86 } 87 } 88 }; 89 90 } // namespace android 91 92 #endif // _ANDROID_GRAPHICS_MINIKIN_UTILS_H_ 93
