mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-08-30 04:02:39 +08:00
66 lines
2.2 KiB
Go
66 lines
2.2 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"encoding/binary"
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)
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// FixFontDataAggressive 激进修复字体数据
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// 尝试修复缺失表(OS/2, cmap等)的TrueType字体或包装CFF裸数据
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// 对显式字形映射补充私有字符cmap，便于按glyph id渲染
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// 入参: data 原始字体数据, fixCmap 是否修复cmap, fixName 是否修复name
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// 返回: bool 是否修复, []byte 修复后数据, map[rune]uint16 字符映射, bool 是否缺失cmap, error 错误信息
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func FixFontDataAggressive(data []byte, fixCmap, fixName bool) (bool, []byte, map[rune]uint16, bool, error) {
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if len(data) < 4 {
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return false, data, nil, false, nil
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}
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tag := string(data[0:4])
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u32Tag := binary.BigEndian.Uint32(data[0:4])
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isTrueType := u32Tag == 0x00010000 || tag == "true"
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isOpenType := tag == "OTTO"
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isTTC := tag == "ttcf"
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if isTTC {
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return false, data, nil, false, nil
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}
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if isBareCFFData(data) {
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otf, mapping, err := wrapCFFToOTF(data)
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if err != nil {
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return false, data, nil, false, err
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}
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return true, otf, mapping, false, nil
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}
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if !isTrueType && !isOpenType {
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return false, data, nil, false, nil
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}
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fixed, newData, mapping, mc, err := fixTrueType(data, fixCmap, fixName)
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return fixed, newData, mapping, mc, err
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}
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// isBareCFFData 检查是否为 CFF 裸字体数据
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// 入参: data 字体数据
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// 返回: bool 是否为 CFF 裸数据
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func isBareCFFData(data []byte) bool {
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if len(data) < 4 {
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return false
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}
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if data[0] != 1 || data[1] != 0 {
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return false
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}
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hdrSize := int(data[2])
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offSize := int(data[3])
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return 4 <= hdrSize && hdrSize <= len(data) && 1 <= offSize && offSize <= 4
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}
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