mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
246 lines
7.6 KiB
Go
246 lines
7.6 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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"reflect"
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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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// pdfClipPath 保存导入器只读的裁剪几何，不缓存对象位移或文字裁剪
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type pdfClipPath struct {
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box Box
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data string
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path *[1]PathObject
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}
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// clipPath 复用页面内重复路径编码，按估算字节预算淘汰且不缓存错误
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// 入参: path 裁剪路径
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// 返回: pdfClipPath 变换后的边界及编码, error 取消错误
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func (p *pdfImporter) clipPath(path pdfgo.Path) (pdfClipPath, error) {
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key, err := codecpdf.ClipPathKey(p.ctx, path, p.matrix)
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if err != nil {
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return pdfClipPath{}, err
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}
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if p.clipPaths == nil {
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p.clipPaths = &renderCache[[32]byte, pdfClipPath]{limit: 8 << 20}
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}
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if cached, ok := p.clipPaths.get(key); ok {
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return cached, nil
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}
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box, err := p.pathBoundsContext(p.ctx, path)
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if err != nil {
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return pdfClipPath{}, err
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}
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data, err := p.pathDataContext(p.ctx, path, box)
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if err != nil {
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return pdfClipPath{}, err
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}
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rule := "NonZero"
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if path.EvenOdd {
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rule = "Even-Odd"
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}
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boundary := pdfBoundary(box)
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fill, stroke := true, false
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result := pdfClipPath{box: box, data: data, path: &[1]PathObject{{Boundary: boundary, AbbreviatedData: data, Rule: rule, Fill: &fill, Stroke: &stroke}}}
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p.clipPaths.put(key, result, len(data)+len(boundary)+512)
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return result, nil
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}
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// sharedClipObjects 将连续重复的大裁剪区提取为复合对象，保留页面坐标和绘制顺序
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// 入参: objects 本库生成且尚未分配标识的对象
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// 返回: []GraphicObject 提取后的对象, error 资源创建或取消错误
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func (p *pdfImporter) sharedClipObjects(objects []GraphicObject) ([]GraphicObject, error) {
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var output []GraphicObject
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for start := 0; start < len(objects); {
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if err := p.ctx.Err(); err != nil {
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return nil, err
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}
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clips := pdfPageClip(objects[start])
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end := start + 1
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if clips != nil {
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for end < len(objects) && pdfMatchesPageClip(objects[end], clips) {
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if err := p.ctx.Err(); err != nil {
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return nil, err
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}
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end++
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}
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}
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if end-start < 2 {
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if output != nil {
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output = append(output, objects[start])
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}
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start = end
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continue
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}
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if output == nil {
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output = append(make([]GraphicObject, 0, len(objects)), objects[:start]...)
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}
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members := objects[start:end:end]
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for index := range members {
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*editorObjectClips(&members[index]) = nil
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}
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id, err := p.objectValidation().addOwnedVector(p.ctx, members, p.pageWidth, p.pageHeight)
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if err != nil {
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return nil, err
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}
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output = append(output, GraphicObject{Type: "CompositeObject", CompositeGraphicUnit: CompositeGraphicUnit{
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Boundary: pdfBoundary(Box{W: p.pageWidth, H: p.pageHeight}), ResourceID: id, Clips: clips,
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}})
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start = end
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}
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if output == nil {
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return objects, nil
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}
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return output, nil
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}
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// pdfPageClip 将导入裁剪区还原到页面坐标，仅提取包含大量重复路径数据的裁剪
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// 入参: object 导入对象
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// 返回: *Clips 页面坐标裁剪，不满足提取条件时为空
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func pdfPageClip(object GraphicObject) *Clips {
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if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "ImageObject" {
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return nil
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}
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clips := *editorObjectClips(&object)
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if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) == 0 {
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return nil
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}
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boundary, _ := editorGeometry(object)
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box, err := ParseBox(boundary)
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if err != nil {
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return nil
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}
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translation := ""
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if box.X != 0 || box.Y != 0 {
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translation = pdfNumbers(1, 0, 0, 1, -box.X, -box.Y)
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}
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bytes := 0
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result := &Clips{Clip: make([]Clip, len(clips.Clip))}
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for index, clip := range clips.Clip {
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if len(clip.Area) != 1 || clip.Area[0].CTM != translation {
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return nil
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}
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area := clip.Area[0]
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area.CTM = ""
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result.Clip[index].Area = []ClipArea{area}
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for _, path := range area.Path {
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bytes += len(path.AbbreviatedData)
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}
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}
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if bytes < 2048 {
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return nil
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}
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return result
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}
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// pdfMatchesPageClip 比较页面坐标裁剪，不将相同外接矩形视为相同路径
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// 入参: object 导入对象, pageClip 已还原的裁剪区
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// 返回: bool 是否可共享裁剪区
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func pdfMatchesPageClip(object GraphicObject, pageClip *Clips) bool {
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if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "ImageObject" {
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return false
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}
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clips := *editorObjectClips(&object)
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if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) != len(pageClip.Clip) {
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return false
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}
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boundary, _ := editorGeometry(object)
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box, err := ParseBox(boundary)
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if err != nil {
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return false
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}
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translation := ""
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if box.X != 0 || box.Y != 0 {
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translation = pdfNumbers(1, 0, 0, 1, -box.X, -box.Y)
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}
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for index, clip := range clips.Clip {
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if len(clip.Area) != 1 || clip.Area[0].CTM != translation {
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return false
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}
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area, expected := clip.Area[0], pageClip.Clip[index].Area[0]
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if area.DrawParam != expected.DrawParam || !reflect.DeepEqual(area.Path, expected.Path) || !reflect.DeepEqual(area.Text, expected.Text) {
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return false
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}
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}
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return true
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}
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// clips 省略覆盖对象边界的矩形裁剪，复用其余几何并保留位移及路径交集
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// 入参: paths 裁剪路径, origin 对象边界
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// 返回: *Clips OFD裁剪区域，无裁剪时为空, error 未解析的裁剪字形
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func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) (*Clips, error) {
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if len(paths) == 0 {
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return nil, nil
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}
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var clips *Clips
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var areas []ClipArea
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translation := ""
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for _, path := range paths {
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if err := p.ctx.Err(); err != nil {
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return nil, err
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}
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if codecpdf.ClipContainsBoundary(path, p.matrix, origin) {
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continue
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}
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if clips == nil {
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clips = &Clips{Clip: make([]Clip, 0, len(paths))}
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areas = make([]ClipArea, len(paths))
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if origin.X != 0 || origin.Y != 0 {
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translation = pdfNumbers(1, 0, 0, 1, -origin.X, -origin.Y)
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}
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}
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index := len(clips.Clip)
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area := &areas[index]
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area.CTM = translation
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if len(path.Segments) != 0 {
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encoded, err := p.clipPath(path)
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if err != nil {
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return nil, err
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}
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area.Path = encoded.path[:1:1]
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}
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for _, mark := range path.Text {
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objects, ok := p.clipTexts[mark]
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if !ok {
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if err := p.flushPath(); err != nil {
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return nil, err
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}
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count := p.objects.len()
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textCount := p.report.TextObjects
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if err := p.text(pdfgo.TextMark{Font: mark.Font, Glyphs: mark.Glyphs, Positions: mark.Positions, Matrix: mark.Matrix, Size: mark.Size, HorizontalScale: mark.HorizontalScale, Mode: 7, Clip: mark, Style: pdfgo.Style{Fill: pdfgo.Paint{Alpha: 1}}}); err != nil {
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return nil, err
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}
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p.objects.truncate(count)
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p.report.TextObjects = textCount
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objects = p.clipTexts[mark]
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}
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if len(path.Text) == 1 {
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area.Text = objects[:len(objects):len(objects)]
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} else {
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area.Text = append(area.Text, objects...)
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}
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}
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if len(area.Path)+len(area.Text) == 0 {
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fill, stroke := true, false
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area.Path = []PathObject{{Boundary: "0 0 1 1", AbbreviatedData: "M 0 0 C", Fill: &fill, Stroke: &stroke}}
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}
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clips.Clip = append(clips.Clip, Clip{Area: areas[index : index+1 : index+1]})
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}
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return clips, nil
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}
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