1065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka/* 2065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * Copyright (C) 2017 The Android Open Source Project 3065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * 4065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * Licensed under the Apache License, Version 2.0 (the "License"); 5065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * you may not use this file except in compliance with the License. 6065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * You may obtain a copy of the License at 7065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * 8065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * http://www.apache.org/licenses/LICENSE-2.0 9065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * 10065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * Unless required by applicable law or agreed to in writing, software 11065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * distributed under the License is distributed on an "AS IS" BASIS, 12065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * See the License for the specific language governing permissions and 14065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka * limitations under the License. 15065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka */ 16065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 17065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka#include <stdlib.h> 18065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka#include <stdint.h> 19065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 20065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka#include "FontUtils.h" 21065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 22065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonakanamespace minikin { 23065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 24065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonakastatic uint16_t readU16(const uint8_t* data, size_t offset) { 25065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return data[offset] << 8 | data[offset + 1]; 26065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka} 27065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 28065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonakastatic uint32_t readU32(const uint8_t* data, size_t offset) { 29065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return ((uint32_t)data[offset]) << 24 | ((uint32_t)data[offset + 1]) << 16 | 30065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka ((uint32_t)data[offset + 2]) << 8 | ((uint32_t)data[offset + 3]); 31065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka} 32065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 33065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonakabool analyzeStyle(const uint8_t* os2_data, size_t os2_size, int* weight, bool* italic) { 34065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kUsWeightClassOffset = 4; 35065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kFsSelectionOffset = 62; 36065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint16_t kItalicFlag = (1 << 0); 37065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka if (os2_size < kFsSelectionOffset + 2) { 38065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return false; 39065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka } 40065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka uint16_t weightClass = readU16(os2_data, kUsWeightClassOffset); 41065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka *weight = weightClass / 100; 42065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka uint16_t fsSelection = readU16(os2_data, kFsSelectionOffset); 43065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka *italic = (fsSelection & kItalicFlag) != 0; 44065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return true; 45065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka} 46065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 47065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonakavoid analyzeAxes(const uint8_t* fvar_data, size_t fvar_size, std::unordered_set<uint32_t>* axes) { 48065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kMajorVersionOffset = 0; 49065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kMinorVersionOffset = 2; 50065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kOffsetToAxesArrayOffset = 4; 51065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kAxisCountOffset = 8; 52065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const size_t kAxisSizeOffset = 10; 53065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 54065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka axes->clear(); 55065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 56065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka if (fvar_size < kAxisSizeOffset + 2) { 57065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return; 58065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka } 59065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint16_t majorVersion = readU16(fvar_data, kMajorVersionOffset); 60065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint16_t minorVersion = readU16(fvar_data, kMinorVersionOffset); 61065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint32_t axisOffset = readU16(fvar_data, kOffsetToAxesArrayOffset); 62065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint32_t axisCount = readU16(fvar_data, kAxisCountOffset); 63065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka const uint32_t axisSize = readU16(fvar_data, kAxisSizeOffset); 64065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka 65065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka if (majorVersion != 1 || minorVersion != 0 || axisOffset != 0x10 || axisSize != 0x14) { 66065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return; // Unsupported version. 67065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka } 68065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka if (fvar_size < axisOffset + axisOffset * axisCount) { 69065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka return; // Invalid table size. 70065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka } 71065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka for (uint32_t i = 0; i < axisCount; ++i) { 72065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka size_t axisRecordOffset = axisOffset + i * axisSize; 73065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka uint32_t tag = readU32(fvar_data, axisRecordOffset); 74065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka axes->insert(tag); 75065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka } 76065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka} 77065c46a665d562c93ffa82fda10dee52a16ac23bSeigo Nonaka} // namespace minikin 78