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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <stdint.h>
#include <minikin/AnalyzeStyle.h>
namespace android {
// should we have a single FontAnalyzer class this stuff lives in, to avoid dup?
static int32_t readU16(const uint8_t* data, size_t offset) {
return data[offset] << 8 | data[offset + 1];
}
bool analyzeStyle(const uint8_t* os2_data, size_t os2_size, int* weight, bool* italic) {
const size_t kUsWeightClassOffset = 4;
const size_t kFsSelectionOffset = 62;
const uint16_t kItalicFlag = (1 << 0);
if (os2_size < kFsSelectionOffset + 2) {
return false;
}
uint16_t weightClass = readU16(os2_data, kUsWeightClassOffset);
*weight = weightClass / 100;
uint16_t fsSelection = readU16(os2_data, kFsSelectionOffset);
*italic = (fsSelection & kItalicFlag) != 0;
return true;
}
} // namespace android
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