FontFamily.cpp revision ecc2d34ac23a497988f21e5f415b53c007b9d8c5
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#define LOG_TAG "Minikin" 18 19#include <cutils/log.h> 20#include <stdlib.h> 21#include <stdint.h> 22#include <minikin/MinikinFont.h> 23#include <minikin/AnalyzeStyle.h> 24#include <minikin/FontFamily.h> 25#include <UniquePtr.h> 26 27using std::vector; 28 29namespace android { 30 31bool FontFamily::addFont(MinikinFont* typeface) { 32 const uint32_t os2Tag = MinikinFont::MakeTag('O', 'S', '/', '2'); 33 size_t os2Size = 0; 34 bool ok = typeface->GetTable(os2Tag, NULL, &os2Size); 35 if (!ok) return false; 36 UniquePtr<uint8_t[]> os2Data(new uint8_t[os2Size]); 37 ok = typeface->GetTable(os2Tag, os2Data.get(), &os2Size); 38 if (!ok) return false; 39 int weight; 40 bool italic; 41 if (analyzeStyle(os2Data.get(), os2Size, &weight, &italic)) { 42 //ALOGD("analyzed weight = %d, italic = %s", weight, italic ? "true" : "false"); 43 FontStyle style(weight, italic); 44 addFont(typeface, style); 45 return true; 46 } else { 47 ALOGD("failed to analyze style"); 48 } 49 return false; 50} 51 52void FontFamily::addFont(MinikinFont* typeface, FontStyle style) { 53 mFonts.push_back(Font(typeface, style)); 54} 55 56// Compute a matching metric between two styles - 0 is an exact match 57int computeMatch(FontStyle style1, FontStyle style2) { 58 if (style1 == style2) return 0; 59 int score = abs(style1.getWeight() - style2.getWeight()); 60 if (style1.getItalic() != style2.getItalic()) { 61 score += 2; 62 } 63 return score; 64} 65 66MinikinFont* FontFamily::getClosestMatch(FontStyle style) const { 67 const Font* bestFont = NULL; 68 int bestMatch = 0; 69 for (size_t i = 0; i < mFonts.size(); i++) { 70 const Font& font = mFonts[i]; 71 int match = computeMatch(font.style, style); 72 if (i == 0 || match < bestMatch) { 73 bestFont = &font; 74 bestMatch = match; 75 } 76 } 77 return bestFont == NULL ? NULL : bestFont->typeface; 78} 79 80size_t FontFamily::getNumFonts() const { 81 return mFonts.size(); 82} 83 84MinikinFont* FontFamily::getFont(size_t index) const { 85 return mFonts[index].typeface; 86} 87 88FontStyle FontFamily::getStyle(size_t index) const { 89 return mFonts[index].style; 90} 91 92} // namespace android 93