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 #include <stdlib.h> 18 #include <stdint.h> 19 20 #include <minikin/AnalyzeStyle.h> 21 22 namespace android { 23 24 // should we have a single FontAnalyzer class this stuff lives in, to avoid dup? 25 static int32_t readU16(const uint8_t* data, size_t offset) { 26 return data[offset] << 8 | data[offset + 1]; 27 } 28 29 bool analyzeStyle(const uint8_t* os2_data, size_t os2_size, int* weight, bool* italic) { 30 const size_t kUsWeightClassOffset = 4; 31 const size_t kFsSelectionOffset = 62; 32 const uint16_t kItalicFlag = (1 << 0); 33 if (os2_size < kFsSelectionOffset + 2) { 34 return false; 35 } 36 uint16_t weightClass = readU16(os2_data, kUsWeightClassOffset); 37 *weight = weightClass / 100; 38 uint16_t fsSelection = readU16(os2_data, kFsSelectionOffset); 39 *italic = (fsSelection & kItalicFlag) != 0; 40 return true; 41 } 42 43 } // namespace android 44
