mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
38 lines
1.4 KiB
Go
38 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 pdf
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import (
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"github.com/xiaoqidun/pdfgo"
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)
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// OutputColor 将合成结果映射到OFD输出，与保留的设备四色对象使用相同显示换算
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// 入参: space 合成空间, values 非预乘分量
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// 返回: [3]float64 显示颜色, error 校准颜色转换错误
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func OutputColor(space *pdfgo.ColorSpace, values [4]float64) ([3]float64, error) {
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if space.Model == "DeviceCMYK" && !space.Calibrated() {
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black := 1 - values[3]
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return [3]float64{(1 - values[0]) * black, (1 - values[1]) * black, (1 - values[2]) * black}, nil
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}
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return space.RGB(values[:space.Components()], "RelativeColorimetric")
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}
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// NormalBlend 判断混合模式是否为普通覆盖
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// 入参: mode 混合模式
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// 返回: bool 是否普通覆盖
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func NormalBlend(mode pdfgo.Name) bool {
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return mode == "" || mode == "Normal" || mode == "Compatible"
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}
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