mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
43 lines
1.5 KiB
Go
43 lines
1.5 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
|
|
//
|
|
// 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.
|
|
|
|
package ofdgo
|
|
|
|
import "github.com/xiaoqidun/pdfgo"
|
|
|
|
// halftone 检查连续色调转换，避免将打印网屏误用于屏幕显示
|
|
// 入参: style 图形状态
|
|
// 返回: error 严格模式无法保留设备网屏
|
|
func (p *pdfImporter) halftone(style pdfgo.Style) error {
|
|
h := style.Halftone
|
|
message := "PDF continuous-tone appearance retained; device halftone not transferred to OFD"
|
|
if h == nil || h.Type == 0 {
|
|
if style.HalftoneOrigin == nil {
|
|
return nil
|
|
}
|
|
message = "PDF continuous-tone appearance retained; device halftone origin not transferred to OFD"
|
|
}
|
|
if p.warning == nil {
|
|
return &pdfgo.UnsupportedError{Feature: "device halftone conversion"}
|
|
}
|
|
if p.halftoneWarnings == nil {
|
|
p.halftoneWarnings = make(map[*pdfgo.Halftone]bool)
|
|
}
|
|
if !p.halftoneWarnings[h] {
|
|
p.halftoneWarnings[h] = true
|
|
p.warning(pdfgo.Diagnostic{Message: message})
|
|
}
|
|
return nil
|
|
}
|