mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
xiaoqidun committed
1 parent
84808cda61
commit
ec24b6a17d
17 files changed
+1908
-2026
No files matched your search
@@ -15,13 +15,23 @@
|
||||
package ofdgo
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"encoding/xml"
|
||||
"errors"
|
||||
"fmt"
|
||||
"math"
|
||||
"strconv"
|
||||
|
||||
codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
|
||||
"github.com/xiaoqidun/pdfgo"
|
||||
)
|
||||
|
||||
// pdfDestinationFontBackend 禁止内容度量忽略实际绘制所需的缺失字体
|
||||
type pdfDestinationFontBackend struct {
|
||||
FontBackend
|
||||
}
|
||||
|
||||
// documentOpenActions 转换文档初始目标与打开动作，不执行脚本或打开资源
|
||||
// 入参: ctx 取消上下文
|
||||
// 返回: error 动作、编码或取消错误
|
||||
@@ -207,3 +217,197 @@ func (p *pdfImporter) annotationTriggerActions(ctx context.Context, annotation p
|
||||
}
|
||||
return converted, ctx.Err()
|
||||
}
|
||||
|
||||
// ResolveFont 沿用字体匹配，只在实际绘制缺少字体数据时中止度量
|
||||
// 入参: renderer 度量渲染器, id 字体标识, exact 是否禁止无关回退
|
||||
// 返回: ResolvedFont 字体资源, error 解析或缺失错误
|
||||
func (b pdfDestinationFontBackend) ResolveFont(renderer *Renderer, id string, exact bool) (ResolvedFont, error) {
|
||||
font, err := b.FontBackend.ResolveFont(renderer, id, exact)
|
||||
if err == nil && len(font.Data) == 0 {
|
||||
err = fmt.Errorf("PDF destination font %q unavailable", id)
|
||||
}
|
||||
return font, err
|
||||
}
|
||||
|
||||
// destinationBounds 度量目标页内容并缓存页面内范围，不包含注解或像素取整
|
||||
// 入参: page PDF目标页
|
||||
// 返回: Box OFD内容范围, error 度量错误
|
||||
func (p *pdfImporter) destinationBounds(page *pdfgo.Page) (Box, error) {
|
||||
if err := p.ctx.Err(); err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
if box, ok := p.destinationBoxes[page.Reference]; ok {
|
||||
return box, nil
|
||||
}
|
||||
if index, ok := p.pageIndexes[page.Reference]; ok {
|
||||
previous := p.page
|
||||
p.page = index
|
||||
defer func() { p.page = previous }()
|
||||
}
|
||||
matrix, width, height := codecpdf.PageMatrix(page)
|
||||
editor := NewEditor()
|
||||
editor.SetRenderBackends(p.editor.Backends())
|
||||
editor.SetFontDirs(p.editor.fontDirs...)
|
||||
editor.SetFontFS(p.editor.fontFS...)
|
||||
editor.fontSourcesCache = p.renderer.fontSourcesCache
|
||||
editor.validatedPaths = p.editor.pathValidationCache()
|
||||
if _, err := editor.AddPage(width, height); err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
local := pdfImporter{
|
||||
ctx: p.ctx, reader: p.reader, editor: editor, renderer: p.renderer,
|
||||
matrix: matrix, pageBox: page.CropBox, pageWidth: width, pageHeight: height,
|
||||
rasterDPI: p.rasterDPI, fontIDs: make(map[*pdfgo.Font]string),
|
||||
resolveFile: p.resolveFile, resolveReference: p.resolveReference,
|
||||
references: &codecpdf.ReferenceCache{},
|
||||
halftones: p.halftones, halftoneWarnings: make(map[*pdfgo.Halftone]bool),
|
||||
}
|
||||
defer local.references.Close()
|
||||
if err := local.compositePage(nil, func(visitor pdfgo.Visitor) error {
|
||||
return p.reader.WalkPage(p.ctx, page, visitor)
|
||||
}); err != nil {
|
||||
return Box{}, fmt.Errorf("PDF destination content: %w", err)
|
||||
}
|
||||
if err := local.commitObjects(); err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
reader, err := editor.resourceReader()
|
||||
if err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
defer reader.Close()
|
||||
renderer := p.renderer.childRenderer(reader)
|
||||
renderer.TransparentBackground = true
|
||||
renderer.RenderAnnotations = false
|
||||
if renderer.backends.Fonts != nil {
|
||||
renderer.backends.Fonts = pdfDestinationFontBackend{renderer.backends.Fonts}
|
||||
}
|
||||
scene, err := renderer.CompilePageContext(p.ctx, &editor.pages[0])
|
||||
if err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
if scene == nil {
|
||||
return Box{}, fmt.Errorf("PDF destination content scene unavailable")
|
||||
}
|
||||
geometry, err := renderer.Geometry()
|
||||
if err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
box, err := scene.BoundsContext(p.ctx, geometry)
|
||||
if err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
left, top := math.Max(0, box.X), math.Max(0, box.Y)
|
||||
right, bottom := math.Min(width, box.X+box.W), math.Min(height, box.Y+box.H)
|
||||
box = Box{X: left, Y: top, W: right - left, H: bottom - top}
|
||||
if !finite(left) || !finite(top) || !finite(right) || !finite(bottom) || box.W <= 0 || box.H <= 0 {
|
||||
return Box{}, fmt.Errorf("PDF destination content bounds empty or invalid")
|
||||
}
|
||||
if err := p.ctx.Err(); err != nil {
|
||||
return Box{}, err
|
||||
}
|
||||
if p.destinationBoxes == nil {
|
||||
p.destinationBoxes = make(map[pdfgo.Reference]Box)
|
||||
}
|
||||
p.destinationBoxes[page.Reference] = box
|
||||
return box, nil
|
||||
}
|
||||
|
||||
// outlines 按先序批量转换目录，保留层级、展开状态和动作顺序
|
||||
// 入参: ctx 取消上下文
|
||||
// 返回: error 严格模式转换错误或取消错误
|
||||
func (p *pdfImporter) outlines(ctx context.Context) error {
|
||||
count := 0
|
||||
data, err := encodeOFDXMLContext(ctx, func(x *ofdXML) {
|
||||
x.root("Outlines", nil)
|
||||
depth := 0
|
||||
err := p.reader.WalkOutlines(ctx, func(level int, item pdfgo.OutlineItem) error {
|
||||
actions, err := p.outlineActions(ctx, item)
|
||||
if err != nil {
|
||||
if p.warning == nil || ctx.Err() != nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) || errors.Is(err, errPDFMediaRead) {
|
||||
return err
|
||||
}
|
||||
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline %q actions not transferred to OFD: %v", item.Title, err)})
|
||||
actions = nil
|
||||
}
|
||||
for depth > level {
|
||||
x.end("OutlineElem")
|
||||
depth--
|
||||
}
|
||||
attrs := ofdAttrs{{Name: xml.Name{Local: "Title"}, Value: item.Title}}
|
||||
attrs.add("Expanded", strconv.FormatBool(item.Expanded))
|
||||
x.start("OutlineElem", attrs)
|
||||
x.actions(actions)
|
||||
depth++
|
||||
count++
|
||||
return x.err
|
||||
})
|
||||
if err != nil {
|
||||
x.err = err
|
||||
return
|
||||
}
|
||||
for depth > 0 {
|
||||
x.end("OutlineElem")
|
||||
depth--
|
||||
}
|
||||
x.end("Outlines")
|
||||
})
|
||||
if err != nil {
|
||||
if ctx.Err() != nil {
|
||||
return ctx.Err()
|
||||
}
|
||||
if p.warning == nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) || errors.Is(err, errPDFMediaRead) {
|
||||
return err
|
||||
}
|
||||
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outlines not transferred to OFD: %v", err)})
|
||||
return nil
|
||||
}
|
||||
if count > 0 {
|
||||
p.editor.outlines = bytes.TrimPrefix(data, []byte(xml.Header))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// outlineActions 转换目录目标及动作链，不为无目标节点补充跳转
|
||||
// 入参: ctx 取消上下文, item PDF目录节点
|
||||
// 返回: []Action OFD动作序列, error 动作或取消错误
|
||||
func (p *pdfImporter) outlineActions(ctx context.Context, item pdfgo.OutlineItem) ([]Action, error) {
|
||||
object, err := p.reader.Resolve(item.Action)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
dest, err := p.reader.Resolve(item.Destination)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
if dest != nil {
|
||||
if object != nil {
|
||||
return nil, fmt.Errorf("PDF outline has both destination and action")
|
||||
}
|
||||
object = pdfgo.Dictionary{"S": pdfgo.Name("GoTo"), "D": dest}
|
||||
}
|
||||
currentPage := -1
|
||||
var actions []Action
|
||||
err = p.reader.WalkActions(ctx, object, func(info pdfgo.ActionInfo) error {
|
||||
converted, err := p.linkActions(pdfgo.Annotation{Dictionary: pdfgo.Dictionary{"A": info.Dictionary}}, p.warning == nil, ¤tPage)
|
||||
if err != nil {
|
||||
if errors.Is(err, errPDFMediaRead) {
|
||||
return err
|
||||
}
|
||||
var unsupported *pdfgo.UnsupportedError
|
||||
if p.warning != nil && (errors.As(err, &unsupported) || errors.Is(err, pdfgo.ErrInvalidDestination) || errors.Is(err, pdfgo.ErrInvalidAction)) {
|
||||
p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline action not transferred to OFD: %v", err)})
|
||||
currentPage = -1
|
||||
return nil
|
||||
}
|
||||
return err
|
||||
}
|
||||
if converted != nil {
|
||||
actions = append(actions, converted...)
|
||||
} else {
|
||||
currentPage = -1
|
||||
}
|
||||
return nil
|
||||
})
|
||||
return actions, err
|
||||
}
|
||||
Reference in new issue
Block a user