mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
286 lines
9.1 KiB
Go
286 lines
9.1 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 ofdgo
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import (
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"context"
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"fmt"
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"io"
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"maps"
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"slices"
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"github.com/tdewolff/canvas"
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basegeom "github.com/xiaoqidun/ofdgo/internal/base/geom"
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codecpdf "github.com/xiaoqidun/ofdgo/internal/codec/pdf"
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"github.com/xiaoqidun/pdfgo"
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)
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// pdfActionArea 保存互不重叠的点击区域及其有序动作
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type pdfActionArea struct {
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Path GeometryPath
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Actions []pdfNavigationAction
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}
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// addActions 按命中区域组合同一对象的点击动作，不合并其他对象的事件
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// 入参: renderer 渲染器, page 页面索引, source 动作来源, bookmarks 书签, pageIndex 页面索引表, pages 页面数据
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// 返回: error 区域、目标或取消错误
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func (n *pdfNavigation) addActions(renderer *Renderer, page int, source actionSource, bookmarks map[string]Dest, pageIndex map[string]int, pages []RenderDocumentPage) error {
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ctx := renderer.outputContext()
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var areas []pdfActionArea
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for _, action := range source.Actions {
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if err := ctx.Err(); err != nil {
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return err
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}
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if action.Event != "CLICK" {
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continue
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}
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box, outline, err := renderer.actionLinkRegion(source, action)
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if err != nil {
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return err
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}
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if box.W <= 0 || box.H <= 0 {
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continue
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}
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value, err := n.actionTarget(action, page, source, bookmarks, pageIndex, pages)
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if err != nil {
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return err
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}
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if value == nil {
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continue
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}
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path := GeometryPath(basegeom.Rectangle(box))
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if outline != "" {
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parsed, err := canvas.ParseSVGPath(outline)
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if err != nil {
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return err
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}
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if parsed.Len() > codecpdf.LinkEdgeLimit {
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return fmt.Errorf("PDF link region exceeds edge limit")
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}
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parsed, err = codecpdf.FlattenLink(ctx, parsed)
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if err != nil {
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return err
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}
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path = *geometryFromCanvasPath(parsed.Transform(canvas.Identity.Scale(1, -1)))
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}
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areas, err = partitionPDFActions(ctx, renderer, areas, path, *value)
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if err != nil {
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return err
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}
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}
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for _, area := range areas {
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if err := ctx.Err(); err != nil {
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return err
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}
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box, err := area.Path.Bounds()
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if err != nil {
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return err
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}
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if box.W <= 0 || box.H <= 0 {
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continue
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}
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outline, err := area.Path.SVG()
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if err != nil {
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return err
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}
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region, err := codecpdf.ActionRegion(ctx, outline, pages[page].Box.H)
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if err != nil {
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return err
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}
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if region != nil && len(region.Quads) == 0 {
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continue
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}
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n.Link[page] = append(n.Link[page], pdfLink{Rect: pdfSourceRect(box, pages[page].Box.H), Region: region, Actions: area.Actions})
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n.nativeWrite = true
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}
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return nil
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}
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// addLifecycleActions 按事件归属收集打开动作，不受点击区域限制
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// 入参: ctx 取消上下文, source 动作来源, page 页面索引，负值表示文档, bookmarks 书签, pageIndex 页面索引表, pages 页面数据
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// 返回: error 目标或取消错误
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func (n *pdfNavigation) addLifecycleActions(ctx context.Context, source actionSource, page int, bookmarks map[string]Dest, pageIndex map[string]int, pages []RenderDocumentPage) error {
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event := "PO"
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if page < 0 {
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event = "DO"
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}
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for _, action := range source.Actions {
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if err := ctx.Err(); err != nil {
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return err
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}
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if action.Event != event || source.Graphic {
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continue
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}
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value, err := n.actionTarget(action, page, source, bookmarks, pageIndex, pages)
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if err != nil {
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return err
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}
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if value == nil {
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continue
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}
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if action.Event == "DO" {
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n.Open = append(n.Open, *value)
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} else {
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n.PageOpen[page] = append(n.PageOpen[page], *value)
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}
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n.nativeWrite = true
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}
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return nil
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}
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// partitionPDFActions 将新增动作区域与已有区域分离，使每个区域具有唯一动作序列
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// 入参: ctx 取消上下文, renderer 渲染器, areas 已有分区, path 新动作区域, action 新动作
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// 返回: []pdfActionArea 新分区, error 几何、复杂度或取消错误
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func partitionPDFActions(ctx context.Context, renderer *Renderer, areas []pdfActionArea, path GeometryPath, action pdfNavigationAction) ([]pdfActionArea, error) {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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if len(areas) == 1 && slices.Equal(areas[0].Path, path) {
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areas[0].Actions = append(areas[0].Actions, action)
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return areas, nil
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}
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remaining := path
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result := make([]pdfActionArea, 0, len(areas)+1)
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box, err := path.Bounds()
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if err != nil {
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return nil, err
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}
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for _, area := range areas {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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other, err := area.Path.Bounds()
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if err != nil {
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return nil, err
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}
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if box.X >= other.X+other.W || other.X >= box.X+box.W || box.Y >= other.Y+other.H || other.Y >= box.Y+box.H {
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result = append(result, area)
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continue
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}
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geometry, err := renderer.Geometry()
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if err != nil {
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return nil, err
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}
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common, err := combinePDFActionRegion(ctx, geometry, area.Path, path, GeometryIntersect)
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if err != nil {
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return nil, err
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}
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if len(common) == 0 {
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result = append(result, area)
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continue
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}
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only, err := combinePDFActionRegion(ctx, geometry, area.Path, path, GeometrySubtract)
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if err != nil {
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return nil, err
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}
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if len(only) != 0 {
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result = append(result, pdfActionArea{Path: only, Actions: area.Actions})
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}
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result = append(result, pdfActionArea{Path: common, Actions: append(slices.Clone(area.Actions), action)})
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remaining, err = combinePDFActionRegion(ctx, geometry, remaining, area.Path, GeometrySubtract)
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if err != nil {
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return nil, err
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}
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if len(result) > codecpdf.LinkEdgeLimit {
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return nil, fmt.Errorf("PDF action partition exceeds region limit")
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}
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}
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if len(remaining) != 0 {
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result = append(result, pdfActionArea{Path: remaining, Actions: []pdfNavigationAction{action}})
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}
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if len(result) > codecpdf.LinkEdgeLimit {
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return nil, fmt.Errorf("PDF action partition exceeds region limit")
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}
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edges := 0
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for _, area := range result {
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edges += len(area.Path)
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if edges > codecpdf.LinkQuadLimit {
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return nil, fmt.Errorf("PDF action partition exceeds total edge limit")
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}
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}
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return result, ctx.Err()
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}
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// combinePDFActionRegion 对有界点击路径执行布尔运算，检查取消及中间结果规模
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// 入参: ctx 取消上下文, geometry 几何后端, left 左路径, right 右路径, operation 运算类型
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// 返回: GeometryPath 结果路径, error 几何、复杂度或取消错误
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func combinePDFActionRegion(ctx context.Context, geometry GeometryBackend, left, right GeometryPath, operation GeometryOperation) (GeometryPath, error) {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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if len(left) > codecpdf.LinkEdgeLimit || len(right) > codecpdf.LinkEdgeLimit {
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return nil, fmt.Errorf("PDF action partition exceeds edge limit")
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}
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result, err := geometry.Combine(left, right, operation)
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if err != nil {
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return nil, err
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}
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if len(result) > codecpdf.LinkEdgeLimit {
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return nil, fmt.Errorf("PDF action partition exceeds edge limit")
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}
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return result, ctx.Err()
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}
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// pdfNavigationValues 将输出页索引替换为实际PDF页面引用
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// 入参: actions 有序导航动作, pages 输出页面引用
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// 返回: []pdfgo.NavigationAction 原生导航动作
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func pdfNavigationValues(actions []pdfNavigationAction, pages []pdfgo.Reference) []pdfgo.NavigationAction {
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values := make([]pdfgo.NavigationAction, 0, len(actions))
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for _, action := range actions {
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if action.Movie != nil {
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values = append(values, action.Movie.values()...)
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continue
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}
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value := pdfgo.NavigationAction{URI: action.URI, Attachment: action.Attachment, Sound: action.Sound}
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if action.Target != nil {
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dest := action.Target.Destination
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dest.Page = pages[action.Target.Page]
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value.Destination = &dest
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}
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values = append(values, value)
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}
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return values
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}
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// writeAttachments 在页面绘制后读取附件，保留文件字节，不自动添加个人信息和时间
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// 入参: ctx 取消上下文, options PDF写出配置
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// 返回: error 附件读取或取消错误
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func (n *pdfNavigation) writeAttachments(ctx context.Context, options *pdfgo.RewriteOptions) error {
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if len(n.attachments) == 0 {
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return nil
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}
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options.Attachments = make(map[string]*pdfgo.EmbeddedFile, len(n.attachments))
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for _, id := range slices.Sorted(maps.Keys(n.attachments)) {
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if err := ctx.Err(); err != nil {
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return err
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}
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attachment := n.attachments[id]
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input, err := n.source.openFile(n.source.ResPath(attachment.FileLoc))
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if err != nil {
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return fmt.Errorf("read attachment %s: %w", id, err)
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}
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data, err := io.ReadAll(imageInput{ReadCloser: input, context: ctx})
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closeErr := input.Close()
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if err != nil {
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return fmt.Errorf("read attachment %s: %w", id, err)
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}
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if closeErr != nil {
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return closeErr
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}
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options.Attachments[id] = &pdfgo.EmbeddedFile{Name: attachment.FileName(), Data: data}
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}
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return ctx.Err()
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}
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