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// 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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"context"
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"errors"
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"fmt"
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"math"
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"slices"
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"sync"
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)
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// ErrPrintDenied 表示文档不允许打印或请求份数超出声明上限
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var ErrPrintDenied = errors.New("document printing is not permitted")
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// PrintOptions 设置内容排版，长度以毫米为单位，比例1表示100%
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// Pages为零基有序页码，nil表示全部，非nil空列表表示不选择页面；与PageRange互斥
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// Mode支持single、multiple、booklet、poster；Scaling支持fit、shrink、actual、custom
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// PaperWidth和PaperHeight为实际纸面尺寸，显式提供时不自动交换方向
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// 两者同时为零时，单页沿用源尺寸，其他模式采用A4，小册子默认横向
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// Parity支持all、odd、even，按源页码过滤；Sides支持all、front、back，按输出纸面过滤
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// BookletSheets为每册纸张数，0表示整份一册；Binding支持left、right
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// Rows和Columns仅用于多页，Gap为单元间隔，Overlap为海报相邻纸面的重叠
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// Duplex支持simplex、longEdge、shortEdge；小册子默认shortEdge，其他模式默认simplex
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// PrintableArea为已选设备当前方向下的可打印区域，Margins为该区域内的额外留白
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// Reverse反转纸张输出顺序，保留每张纸内部的正背面与拼版顺序
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// Copies和Collate描述设备作业，不展开重复内容；SheetFrom/SheetTo为一基纸张范围
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// Contents支持documentAndAnnotations、document、annotations、forms，document保留表单外观
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// PageOrder支持horizontal、horizontalReverse、vertical、verticalReverse
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// BackRotate将背面绕纸张中心旋转180度；海报Labels保留底部5毫米绘制拼接标签
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// Scale用于自定义缩放及海报分块，零值采用1；Rotate允许自动旋转页面以适应单元
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// Raster将纸面光栅化，Grayscale以光栅方式输出灰度；DPI默认300，上限2400
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// Borders绘制单元边框，CropMarks绘制裁切标记，TileOnlyLarge仅分块超大页面
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type PrintOptions struct {
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Pages []int `json:"pages,omitempty"`
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PageRange string `json:"pageRange,omitempty"`
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Mode string `json:"mode,omitempty"`
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Scaling string `json:"scaling,omitempty"`
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PaperWidth float64 `json:"paperWidth,omitempty"`
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PaperHeight float64 `json:"paperHeight,omitempty"`
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Margins PrintMargins `json:"margins"`
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PrintableArea *Box `json:"printableArea,omitempty"`
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Duplex string `json:"duplex,omitempty"`
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BackRotate bool `json:"backRotate,omitempty"`
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Copies int `json:"copies,omitempty"`
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Collate *bool `json:"collate,omitempty"`
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SheetFrom int `json:"sheetFrom,omitempty"`
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SheetTo int `json:"sheetTo,omitempty"`
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Scale float64 `json:"scale,omitempty"`
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Rotate bool `json:"rotate,omitempty"`
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Reverse bool `json:"reverse,omitempty"`
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Parity string `json:"parity,omitempty"`
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Sides string `json:"sides,omitempty"`
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Rows int `json:"rows,omitempty"`
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Columns int `json:"columns,omitempty"`
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// ColumnOrder 兼容纵向填充设置，仅在PageOrder为空时生效
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ColumnOrder bool `json:"columnOrder,omitempty"`
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PageOrder string `json:"pageOrder,omitempty"`
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Gap float64 `json:"gap,omitempty"`
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Overlap float64 `json:"overlap,omitempty"`
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BookletSheets int `json:"bookletSheets,omitempty"`
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Binding string `json:"binding,omitempty"`
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// Annotations 兼容注解开关，仅在Contents为空时生效
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Annotations *bool `json:"annotations,omitempty"`
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Contents string `json:"contents,omitempty"`
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Raster bool `json:"raster,omitempty"`
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DPI float64 `json:"dpi,omitempty"`
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Grayscale bool `json:"grayscale,omitempty"`
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Borders bool `json:"borders,omitempty"`
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CropMarks bool `json:"cropMarks,omitempty"`
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TileOnlyLarge bool `json:"tileOnlyLarge,omitempty"`
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Labels bool `json:"labels,omitempty"`
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}
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// PrintMargins 保存纸面四边的非负页边距
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type PrintMargins struct {
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Top float64 `json:"top"`
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Right float64 `json:"right"`
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Bottom float64 `json:"bottom"`
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Left float64 `json:"left"`
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}
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// PrintPlacement 将归一化源页面坐标映射到纸面，Transform按a、b、c、d、e、f排列
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// Clip为纸面坐标裁剪；Page从零开始，同一页面可以多次放置
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// Width和Height为归一化源页尺寸；Clipped表示变换后的内容超出裁剪区域
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type PrintPlacement struct {
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Page int `json:"page"`
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Width float64 `json:"width"`
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Height float64 `json:"height"`
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Transform [6]float64 `json:"transform"`
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Clip Box `json:"clip"`
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Clipped bool `json:"clipped"`
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}
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// PrintSide 保存一个输出纸面，Number是过滤前的一基纸面序号，Sheet为一基纸张编号
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// Back仅在双面作业中表示背面，TileRow/TileColumn为海报的一基拼接位置
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type PrintSide struct {
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Number int `json:"number"`
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Sheet int `json:"sheet"`
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Back bool `json:"back"`
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Width float64 `json:"width"`
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Height float64 `json:"height"`
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Placements []PrintPlacement `json:"placements"`
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TileRow int `json:"tileRow,omitempty"`
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TileColumn int `json:"tileColumn,omitempty"`
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TileRows int `json:"tileRows,omitempty"`
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TileColumns int `json:"tileColumns,omitempty"`
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Label string `json:"label,omitempty"`
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LabelX float64 `json:"labelX,omitempty"`
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LabelY float64 `json:"labelY,omitempty"`
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}
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// PrintLayout 保存独立排版结果，SourcePages为选中源页数，CopiesLimit为文档声明的份数上限
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// CopiesLimit为-1时无限制；纯布局计算不绑定文档，默认同样为-1
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// Sheets为筛选后的纸张数；BackContent表示正背面筛选前存在含页面内容的背面
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type PrintLayout struct {
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SourcePages int `json:"sourcePages"`
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CopiesLimit int `json:"copiesLimit"`
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Copies int `json:"copies"`
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Collate bool `json:"collate"`
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Duplex string `json:"duplex"`
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Sheets int `json:"sheets"`
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BackContent bool `json:"backContent"`
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Sides []PrintSide `json:"sides"`
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}
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// PrintDocument 固定排版和渲染配置，可串行输出多个纸面，Close后不可再渲染
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// Renderer.PreparePrint借用输入，使用结束前不得关闭或修改源输入及外部字体
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// Editor.PreparePrint创建独立编辑快照，不要求保留原编辑器；外部字体仍须可读
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// 各方法以互斥锁串行执行，Layout返回独立副本；取消只中断当前输出，不销毁任务
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type PrintDocument struct {
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mu sync.Mutex
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renderer *Renderer
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layout PrintLayout
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options PrintOptions
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closed bool
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}
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// PlanPrint 仅根据源页面区域和选项计算打印布局，不读取文档或调用设备
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// 入参: pages 按文档顺序排列的页面区域, options 打印内容选项
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// 返回: PrintLayout 有序纸面, error 尺寸、页码或选项错误
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func PlanPrint(pages []Box, options PrintOptions) (PrintLayout, error) {
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o, err := normalizePrintOptions(options)
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if err != nil {
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return PrintLayout{CopiesLimit: -1}, err
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}
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return planPrint(pages, o)
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}
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// planPrint 按已校验的选项计算纸面，供独立布局和打印任务共用
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// 入参: pages 按文档顺序排列的页面区域, o 规范排版选项
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// 返回: PrintLayout 有序纸面, error 尺寸、页码或排版错误
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func planPrint(pages []Box, o PrintOptions) (PrintLayout, error) {
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result := PrintLayout{CopiesLimit: -1}
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if len(pages) == 0 {
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return result, fmt.Errorf("no pages to print")
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}
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for _, page := range pages {
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if !printPositive(page.W) || !printPositive(page.H) {
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return result, fmt.Errorf("invalid print page size")
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}
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}
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indices := o.Pages
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if o.PageRange != "" {
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var err error
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indices, err = ParsePageRange(o.PageRange, len(pages))
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if err != nil {
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return result, err
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}
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} else if o.Pages == nil {
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indices = make([]int, len(pages))
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for i := range indices {
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indices[i] = i
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}
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}
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selected := make([]int, 0, len(indices))
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for _, index := range indices {
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if index < 0 || index >= len(pages) {
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return result, fmt.Errorf("print page index %d outside document", index)
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}
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if o.Parity == "odd" && index%2 != 0 || o.Parity == "even" && index%2 == 0 {
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continue
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}
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selected = append(selected, index)
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}
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if len(selected) == 0 {
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return result, fmt.Errorf("no pages selected for printing")
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}
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result.SourcePages = len(selected)
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result.Copies, result.Collate, result.Duplex = o.Copies, *o.Collate, o.Duplex
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addSide := func(width, height float64, order []int, rows, columns int) error {
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area := printPageArea(width, height, o)
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cw, ch := (area.W-float64(columns-1)*o.Gap)/float64(columns), (area.H-float64(rows-1)*o.Gap)/float64(rows)
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if !printPositive(cw) || !printPositive(ch) {
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return fmt.Errorf("print margins or gap exceed paper size")
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}
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side := PrintSide{Width: width, Height: height, Placements: []PrintPlacement{}}
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for cell, index := range order {
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if index < 0 {
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continue
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}
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x, y := cell%columns, cell/columns
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if o.PageOrder == "vertical" || o.PageOrder == "verticalReverse" {
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x, y = cell/rows, cell%rows
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}
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if o.PageOrder == "horizontalReverse" || o.PageOrder == "verticalReverse" {
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x = columns - 1 - x
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}
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box := Box{X: area.X + float64(x)*(cw+o.Gap), Y: area.Y + float64(y)*(ch+o.Gap), W: cw, H: ch}
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placement := printPlacement(index, pages[index], box, o)
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for _, value := range placement.Transform {
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if math.IsNaN(value) || math.IsInf(value, 0) {
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return fmt.Errorf("invalid print placement")
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}
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}
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side.Placements = append(side.Placements, placement)
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}
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if o.Mode == "poster" && o.Labels && len(order) > 0 {
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side.Label = fmt.Sprintf("Page %d Row 1/1 Column 1/1", order[0]+1)
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side.LabelX, side.LabelY = area.X+1, area.Y+area.H+3.5
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}
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result.Sides = append(result.Sides, side)
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return nil
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}
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w, h := o.PaperWidth, o.PaperHeight
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if w == 0 && o.Mode != "single" {
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w, h = 210, 297
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if o.Mode == "booklet" {
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w, h = h, w
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}
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}
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switch o.Mode {
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case "single":
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for _, index := range selected {
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pw, ph := w, h
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if pw == 0 {
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pw, ph = pages[index].W, pages[index].H
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}
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if err := addSide(pw, ph, []int{index}, 1, 1); err != nil {
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return PrintLayout{}, err
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}
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}
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case "multiple":
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count := o.Rows * o.Columns
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for start := 0; start < len(selected); start += count {
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if err := addSide(w, h, selected[start:min(start+count, len(selected))], o.Rows, o.Columns); err != nil {
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return PrintLayout{}, err
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}
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}
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case "booklet":
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chunk := ((len(selected) + 3) / 4) * 4
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if o.BookletSheets > 0 {
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chunk = o.BookletSheets * 4
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}
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for start := 0; start < len(selected); start += chunk {
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end := min(start+chunk, len(selected))
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order := make([]int, ((end-start+3)/4)*4)
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for i := range order {
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order[i] = -1
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}
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copy(order, selected[start:end])
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for i := 0; i < len(order)/4; i++ {
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for _, pair := range [][]int{{order[len(order)-1-i*2], order[i*2]}, {order[i*2+1], order[len(order)-2-i*2]}} {
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if o.Binding == "right" {
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slices.Reverse(pair)
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}
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if err := addSide(w, h, pair, 1, 2); err != nil {
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return PrintLayout{}, err
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}
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}
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}
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}
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case "poster":
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area := printPageArea(w, h, o)
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if area.W <= o.Overlap || area.H <= o.Overlap {
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return result, fmt.Errorf("poster overlap or margins exceed paper size")
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}
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for _, index := range selected {
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pw, ph := pages[index].W*o.Scale, pages[index].H*o.Scale
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if o.TileOnlyLarge && pw <= area.W && ph <= area.H {
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if err := addSide(w, h, []int{index}, 1, 1); err != nil {
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return PrintLayout{}, err
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}
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continue
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}
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columns, rows := max(1, math.Ceil((pw-o.Overlap)/(area.W-o.Overlap))), max(1, math.Ceil((ph-o.Overlap)/(area.H-o.Overlap)))
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if !printPositive(columns*rows) || columns*rows > 10000 || len(result.Sides)+int(columns*rows) > 10000 {
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return result, fmt.Errorf("too many poster sides")
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}
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for row := 0; row < int(rows); row++ {
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for column := 0; column < int(columns); column++ {
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m := [6]float64{o.Scale, 0, 0, o.Scale, area.X - float64(column)*(area.W-o.Overlap), area.Y - float64(row)*(area.H-o.Overlap)}
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side := PrintSide{Width: w, Height: h, TileRow: row + 1, TileColumn: column + 1, TileRows: int(rows), TileColumns: int(columns), Placements: []PrintPlacement{{Page: index, Width: pages[index].W, Height: pages[index].H, Transform: m, Clip: area}}}
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if o.Labels {
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side.Label = fmt.Sprintf("Page %d Row %d/%d Column %d/%d", index+1, row+1, int(rows), column+1, int(columns))
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side.LabelX, side.LabelY = area.X+1, area.Y+area.H+3.5
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}
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result.Sides = append(result.Sides, side)
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}
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}
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}
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}
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if o.Duplex != "simplex" {
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paired := make([]PrintSide, 0, len(result.Sides)+1)
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for _, side := range result.Sides {
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if len(paired)%2 == 1 {
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previous := paired[len(paired)-1]
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if previous.Width != side.Width || previous.Height != side.Height {
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paired = append(paired, PrintSide{Width: previous.Width, Height: previous.Height, Placements: []PrintPlacement{}})
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}
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}
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paired = append(paired, side)
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}
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if len(paired)%2 == 1 {
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previous := paired[len(paired)-1]
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paired = append(paired, PrintSide{Width: previous.Width, Height: previous.Height, Placements: []PrintPlacement{}})
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}
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result.Sides = paired
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}
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for i := range result.Sides {
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result.Sides[i].Number = i + 1
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result.Sides[i].Sheet = i + 1
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if o.Duplex != "simplex" {
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result.Sides[i].Sheet = i/2 + 1
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result.Sides[i].Back = i%2 == 1
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}
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if o.BackRotate && result.Sides[i].Back {
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for j := range result.Sides[i].Placements {
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placement := &result.Sides[i].Placements[j]
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m := placement.Transform
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placement.Transform = [6]float64{-m[0], -m[1], -m[2], -m[3], result.Sides[i].Width - m[4], result.Sides[i].Height - m[5]}
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placement.Clip.X = result.Sides[i].Width - placement.Clip.X - placement.Clip.W
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placement.Clip.Y = result.Sides[i].Height - placement.Clip.Y - placement.Clip.H
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area := printPageArea(result.Sides[i].Width, result.Sides[i].Height, o)
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x, y := math.Max(area.X, placement.Clip.X), math.Max(area.Y, placement.Clip.Y)
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right, bottom := math.Min(area.X+area.W, placement.Clip.X+placement.Clip.W), math.Min(area.Y+area.H, placement.Clip.Y+placement.Clip.H)
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if right-x < placement.Clip.W-1e-6 || bottom-y < placement.Clip.H-1e-6 {
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placement.Clipped = true
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}
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placement.Clip = Box{X: x, Y: y, W: math.Max(0, right-x), H: math.Max(0, bottom-y)}
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}
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||||
}
|
||||
}
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lastSheet := result.Sides[len(result.Sides)-1].Sheet
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||||
if o.SheetFrom > lastSheet || o.SheetTo > lastSheet {
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return result, fmt.Errorf("print sheet outside layout")
|
||||
}
|
||||
for _, side := range result.Sides {
|
||||
if side.Back && len(side.Placements) > 0 && (o.SheetFrom == 0 || side.Sheet >= o.SheetFrom) && (o.SheetTo == 0 || side.Sheet <= o.SheetTo) {
|
||||
result.BackContent = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if o.Sides != "all" || o.SheetFrom != 0 || o.SheetTo != 0 {
|
||||
filtered := make([]PrintSide, 0, len(result.Sides))
|
||||
for _, side := range result.Sides {
|
||||
if o.SheetFrom > 0 && side.Sheet < o.SheetFrom || o.SheetTo > 0 && side.Sheet > o.SheetTo {
|
||||
continue
|
||||
}
|
||||
if o.Sides == "all" || o.Sides == "front" && !side.Back || o.Sides == "back" && side.Back {
|
||||
filtered = append(filtered, side)
|
||||
}
|
||||
}
|
||||
result.Sides = filtered
|
||||
}
|
||||
if len(result.Sides) == 0 {
|
||||
return result, fmt.Errorf("no print sides selected")
|
||||
}
|
||||
if o.Reverse {
|
||||
slices.Reverse(result.Sides)
|
||||
for i := 0; i+1 < len(result.Sides); i++ {
|
||||
if result.Sides[i].Sheet == result.Sides[i+1].Sheet {
|
||||
result.Sides[i], result.Sides[i+1] = result.Sides[i+1], result.Sides[i]
|
||||
i++
|
||||
}
|
||||
}
|
||||
}
|
||||
previous := 0
|
||||
for _, side := range result.Sides {
|
||||
if side.Sheet != previous {
|
||||
result.Sheets++
|
||||
previous = side.Sheet
|
||||
}
|
||||
}
|
||||
return result, nil
|
||||
}
|
||||
|
||||
// normalizePrintOptions 校验有限尺寸并填充公共默认值
|
||||
// 入参: o 原始排版选项
|
||||
// 返回: PrintOptions 独立规范选项, error 配置错误
|
||||
func normalizePrintOptions(o PrintOptions) (PrintOptions, error) {
|
||||
if o.Mode == "" {
|
||||
o.Mode = "single"
|
||||
}
|
||||
if o.Scaling == "" {
|
||||
o.Scaling = "shrink"
|
||||
}
|
||||
if o.Parity == "" {
|
||||
o.Parity = "all"
|
||||
}
|
||||
if o.Sides == "" {
|
||||
o.Sides = "all"
|
||||
}
|
||||
if o.Binding == "" {
|
||||
o.Binding = "left"
|
||||
}
|
||||
if o.Duplex == "" {
|
||||
o.Duplex = "simplex"
|
||||
if o.Mode == "booklet" {
|
||||
o.Duplex = "shortEdge"
|
||||
}
|
||||
}
|
||||
if o.Copies == 0 {
|
||||
o.Copies = 1
|
||||
}
|
||||
if o.Collate == nil {
|
||||
collate := true
|
||||
o.Collate = &collate
|
||||
} else {
|
||||
collate := *o.Collate
|
||||
o.Collate = &collate
|
||||
}
|
||||
if o.PageOrder == "" {
|
||||
o.PageOrder = "horizontal"
|
||||
if o.ColumnOrder {
|
||||
o.PageOrder = "vertical"
|
||||
}
|
||||
}
|
||||
if o.Contents == "" {
|
||||
o.Contents = "documentAndAnnotations"
|
||||
if o.Annotations != nil && !*o.Annotations {
|
||||
o.Contents = "document"
|
||||
}
|
||||
}
|
||||
o.ColumnOrder, o.Annotations = false, nil
|
||||
if !slices.Contains([]string{"document", "documentAndAnnotations", "annotations", "forms"}, o.Contents) {
|
||||
return o, fmt.Errorf("invalid print contents")
|
||||
}
|
||||
if o.Scale == 0 {
|
||||
o.Scale = 1
|
||||
}
|
||||
if o.DPI == 0 {
|
||||
o.DPI = 300
|
||||
}
|
||||
if o.Rows == 0 {
|
||||
o.Rows = 1
|
||||
}
|
||||
if o.Columns == 0 {
|
||||
o.Columns = 2
|
||||
}
|
||||
if !slices.Contains([]string{"single", "multiple", "booklet", "poster"}, o.Mode) || !slices.Contains([]string{"fit", "shrink", "actual", "custom"}, o.Scaling) || !slices.Contains([]string{"all", "odd", "even"}, o.Parity) || !slices.Contains([]string{"all", "front", "back"}, o.Sides) || !slices.Contains([]string{"left", "right"}, o.Binding) || !slices.Contains([]string{"simplex", "longEdge", "shortEdge"}, o.Duplex) || !slices.Contains([]string{"horizontal", "horizontalReverse", "vertical", "verticalReverse"}, o.PageOrder) {
|
||||
return o, fmt.Errorf("invalid print mode")
|
||||
}
|
||||
if o.Copies < 1 || o.Copies > 999 || o.SheetFrom < 0 || o.SheetTo < 0 || o.SheetTo > 0 && o.SheetTo < o.SheetFrom || o.Duplex == "simplex" && (o.Mode == "booklet" || o.Sides != "all") {
|
||||
return o, fmt.Errorf("invalid print job options")
|
||||
}
|
||||
if o.PrintableArea != nil {
|
||||
area := *o.PrintableArea
|
||||
if !printPositive(area.W) || !printPositive(area.H) || !printPositive(area.X+1) || !printPositive(area.Y+1) || area.X < 0 || area.Y < 0 || o.PaperWidth <= 0 || area.X+area.W > o.PaperWidth+1e-6 || area.Y+area.H > o.PaperHeight+1e-6 {
|
||||
return o, fmt.Errorf("invalid printer printable area")
|
||||
}
|
||||
o.PrintableArea = &area
|
||||
}
|
||||
for _, v := range []float64{o.PaperWidth, o.PaperHeight, o.Margins.Top, o.Margins.Right, o.Margins.Bottom, o.Margins.Left, o.Gap, o.Overlap} {
|
||||
if math.IsNaN(v) || math.IsInf(v, 0) || v < 0 {
|
||||
return o, fmt.Errorf("invalid print dimensions")
|
||||
}
|
||||
}
|
||||
if (o.PaperWidth == 0) != (o.PaperHeight == 0) || !printPositive(o.Scale) || o.Scale > 100 || !printPositive(o.DPI) || o.DPI > 2400 || o.Rows < 1 || o.Columns < 1 || o.Rows > 16 || o.Columns > 16 || o.BookletSheets < 0 || o.BookletSheets > 2500 || o.Pages != nil && o.PageRange != "" {
|
||||
return o, fmt.Errorf("invalid print options")
|
||||
}
|
||||
o.Pages = slices.Clone(o.Pages)
|
||||
return o, nil
|
||||
}
|
||||
|
||||
// printPositive 检查正有限数
|
||||
// 入参: v 待校验数值
|
||||
// 返回: bool 是否为正有限数
|
||||
func printPositive(v float64) bool {
|
||||
return v > 0 && !math.IsInf(v, 0) && !math.IsNaN(v)
|
||||
}
|
||||
|
||||
// printPageArea 在设备可打印区域内应用额外留白，未知设备时使用整张纸
|
||||
// 入参: w 纸面宽度, h 纸面高度, o 排版选项
|
||||
// 返回: Box 应用额外边距后的毫米区域
|
||||
func printPageArea(w, h float64, o PrintOptions) Box {
|
||||
area := Box{W: w, H: h}
|
||||
if o.PrintableArea != nil {
|
||||
area = *o.PrintableArea
|
||||
}
|
||||
area.X += o.Margins.Left
|
||||
area.Y += o.Margins.Top
|
||||
area.W -= o.Margins.Left + o.Margins.Right
|
||||
area.H -= o.Margins.Top + o.Margins.Bottom
|
||||
if o.Mode == "poster" && o.Labels {
|
||||
area.H -= 5
|
||||
}
|
||||
return area
|
||||
}
|
||||
|
||||
// printPlacement 计算居中及自动旋转后的单元变换
|
||||
// 入参: index 零基源页码, source 源页面区域, cell 纸面单元区域, o 排版选项
|
||||
// 返回: PrintPlacement 页面放置及裁剪信息
|
||||
func printPlacement(index int, source, cell Box, o PrintOptions) PrintPlacement {
|
||||
w, h := source.W, source.H
|
||||
rotated := o.Rotate && math.Min(cell.W/h, cell.H/w) > math.Min(cell.W/w, cell.H/h)
|
||||
if rotated {
|
||||
w, h = h, w
|
||||
}
|
||||
scale := 1.0
|
||||
switch o.Scaling {
|
||||
case "fit":
|
||||
scale = math.Min(cell.W/w, cell.H/h)
|
||||
case "shrink":
|
||||
scale = math.Min(1, math.Min(cell.W/w, cell.H/h))
|
||||
case "custom":
|
||||
scale = o.Scale
|
||||
}
|
||||
x, y := cell.X+(cell.W-w*scale)/2, cell.Y+(cell.H-h*scale)/2
|
||||
m := [6]float64{scale, 0, 0, scale, x, y}
|
||||
if rotated {
|
||||
m = [6]float64{0, scale, -scale, 0, x + source.H*scale, y}
|
||||
}
|
||||
clipped := w*scale > cell.W+1e-6 || h*scale > cell.H+1e-6
|
||||
return PrintPlacement{Page: index, Width: source.W, Height: source.H, Transform: m, Clip: cell, Clipped: clipped}
|
||||
}
|
||||
|
||||
// PreparePrint 固定当前阅读入口、版本及配置，底层输入由调用方保持存活
|
||||
// 入参: ctx 准备上下文, options 内容排版选项
|
||||
// 返回: *PrintDocument 独立打印任务, error 权限、布局或读取错误
|
||||
func (r *Renderer) PreparePrint(ctx context.Context, options PrintOptions) (*PrintDocument, error) {
|
||||
if ctx == nil {
|
||||
return nil, fmt.Errorf("nil print context")
|
||||
}
|
||||
if r == nil || r.Reader == nil {
|
||||
return nil, fmt.Errorf("missing print renderer")
|
||||
}
|
||||
o, err := normalizePrintOptions(options)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
view, err := r.Fork(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
doc, err := view.Reader.DocContext(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if !doc.Permissions.Print || doc.Permissions.Copies == 0 {
|
||||
return nil, ErrPrintDenied
|
||||
}
|
||||
if doc.Permissions.Copies > 0 && o.Copies > doc.Permissions.Copies {
|
||||
return nil, ErrPrintDenied
|
||||
}
|
||||
boxes := make([]Box, len(doc.Pages.Page))
|
||||
for i, page := range doc.Pages.Page {
|
||||
if err := ctx.Err(); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
area, err := view.Reader.readPageHeaderContext(ctx, page)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
boxes[i], err = view.GetPageBox(&area)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
}
|
||||
layout, err := planPrint(boxes, o)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
layout.CopiesLimit = doc.Permissions.Copies
|
||||
view.printing = true
|
||||
view.printContents = o.Contents
|
||||
view.RenderAnnotations = true
|
||||
return &PrintDocument{renderer: view, layout: layout, options: o}, nil
|
||||
}
|
||||
|
||||
// PreparePrint 从独立编辑快照创建打印任务，不修改源编辑器或撤销记录
|
||||
// 入参: ctx 准备上下文, options 排版选项, rendererOptions 字体及后端配置
|
||||
// 返回: *PrintDocument 打印任务, error 快照或准备错误
|
||||
func (e *Editor) PreparePrint(ctx context.Context, options PrintOptions, rendererOptions ...RendererOption) (*PrintDocument, error) {
|
||||
if ctx == nil || e == nil {
|
||||
return nil, fmt.Errorf("missing print editor or context")
|
||||
}
|
||||
snapshot, err := e.Snapshot(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
reader, err := snapshot.Reader(ctx)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer reader.Close()
|
||||
renderer := NewRenderer(reader, rendererOptions...)
|
||||
return renderer.PreparePrint(ctx, options)
|
||||
}
|
||||
|
||||
// Layout 返回可供第三方预览和检查的独立布局副本
|
||||
// 返回: PrintLayout 独立布局副本
|
||||
func (p *PrintDocument) Layout() PrintLayout {
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
result := p.layout
|
||||
result.Sides = slices.Clone(result.Sides)
|
||||
for i := range result.Sides {
|
||||
result.Sides[i].Placements = slices.Clone(result.Sides[i].Placements)
|
||||
}
|
||||
return result
|
||||
}
|
||||
|
||||
// Reconfigure 在相同文档快照上创建新的打印任务，不改变原任务的布局
|
||||
// 入参: ctx 准备上下文, options 新排版选项
|
||||
// 返回: *PrintDocument 独立打印任务, error 权限、布局或读取错误
|
||||
func (p *PrintDocument) Reconfigure(ctx context.Context, options PrintOptions) (*PrintDocument, error) {
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
if p.closed {
|
||||
return nil, fmt.Errorf("print document is closed")
|
||||
}
|
||||
return p.renderer.PreparePrint(ctx, options)
|
||||
}
|
||||
|
||||
// Close 释放任务持有的派生缓存和快照，不关闭调用方借入的输入
|
||||
// 返回: error 资源释放错误
|
||||
func (p *PrintDocument) Close() error {
|
||||
if p == nil {
|
||||
return nil
|
||||
}
|
||||
p.mu.Lock()
|
||||
defer p.mu.Unlock()
|
||||
if p.closed {
|
||||
return nil
|
||||
}
|
||||
p.closed = true
|
||||
p.renderer.ClearCache()
|
||||
err := p.renderer.Reader.Close()
|
||||
p.renderer = nil
|
||||
return err
|
||||
}
|
||||
Reference in new issue
Block a user