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41 lines
1.4 KiB
Go
41 lines
1.4 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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// FontResource 保存独立字体数据、标准元信息与只读度量，不包含绘图库类型
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type FontResource struct {
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FontMetrics
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Data []byte
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Font Font
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Extension string
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CanSubset bool
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}
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// FontUsage 描述全包已确认的字体引用，Unsafe禁止裁剪
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type FontUsage struct {
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Characters []rune
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Glyphs []uint16
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Unsafe bool
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}
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// FontResourceBackend 解析和裁剪保存资源，独立于显示字体后端
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// SubsetFont的preserve为true时不得改变字形编号，SubsetSourceFont无安全收益时返回nil
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type FontResourceBackend interface {
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Backend
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OpenFontResource(file FontFile, index int) (*FontResource, error)
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SubsetFont(data []byte, glyphs []uint16, preserve bool) ([]byte, error)
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SubsetSourceFont(data []byte, usage FontUsage) ([]byte, error)
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}
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