mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
57 lines
2.0 KiB
Go
57 lines
2.0 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 (
|
|
"image"
|
|
"image/color"
|
|
|
|
codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
|
|
"github.com/xiaoqidun/pdfgo"
|
|
)
|
|
|
|
// pdfImageContentKey 区分编码内容、渲染意图、原生输出空间、模板填充色及有损采样尺寸
|
|
type pdfImageContentKey struct {
|
|
data [32]byte
|
|
intent pdfgo.Name
|
|
process pdfgo.Name
|
|
tint color.NRGBA64
|
|
size image.Point
|
|
}
|
|
|
|
// pdfImageContent 保存不依赖间接资源的图像描述及已注册编号
|
|
type pdfImageContent struct {
|
|
source *pdfgo.Image
|
|
id string
|
|
}
|
|
|
|
// imageContentKey 对无间接依赖的小图像生成内容键，超大图像仍沿用流缓存
|
|
// 入参: source 图像描述, key 流缓存键
|
|
// 返回: pdfImageContentKey 内容键, bool 是否可复用, error 取消错误
|
|
func (p *pdfImporter) imageContentKey(source *pdfgo.Image, key pdfImageKey) (pdfImageContentKey, bool, error) {
|
|
digest, reusable, err := codecpdf.ImageDigest(p.ctx, source)
|
|
if !reusable {
|
|
return pdfImageContentKey{}, reusable, err
|
|
}
|
|
return pdfImageContentKey{data: digest, intent: key.intent, process: key.process, tint: key.tint, size: key.size}, true, err
|
|
}
|
|
|
|
// matches 核对完整编码与有效图像属性，不以摘要相同代替内容相同
|
|
// 入参: source 待复用图像
|
|
// 返回: bool 是否可使用同一图像资源
|
|
func (c pdfImageContent) matches(source *pdfgo.Image) bool {
|
|
return codecpdf.SameImage(c.source, source)
|
|
}
|