mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:25:49 +08:00
489 lines
15 KiB
Go
489 lines
15 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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"crypto/sha256"
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"encoding/binary"
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"fmt"
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"image/color"
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"math"
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"reflect"
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"strconv"
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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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// pdfPointBounds 逐点汇总边界，不保留文字或路径的临时坐标数组
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type pdfPointBounds struct {
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minX, minY, maxX, maxY float64
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found bool
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}
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// pdfGeometryPath 转换PDF路径并衔接OFD几何类型
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// 入参: ctx 取消上下文, source PDF路径, matrix 坐标变换
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// 返回: GeometryPath 独立几何路径, error 指令、坐标或取消错误
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func pdfGeometryPath(ctx context.Context, source pdfgo.Path, matrix pdfgo.Matrix) (GeometryPath, error) {
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path, err := codecpdf.GeometryPath(ctx, source, matrix)
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return GeometryPath(path), err
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}
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// compileCoverage 直接编译无文字裁剪的填充覆盖，其他语义交给配置的页面编译器
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// 入参: node 图元, stroke 是否描边
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// 返回: *RasterPage 覆盖场景, Box 页面区域, error 编译错误
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func (p *pdfImporter) compileCoverage(node pdfCompositeNode, stroke bool) (*RasterPage, Box, error) {
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fallback := func() (*RasterPage, Box, error) {
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return p.compileGroup(func(local *pdfImporter) error { return node.coverage(local, stroke) })
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}
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if stroke || node.path == nil && node.image == nil {
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return fallback()
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}
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deferredClip := false
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switch p.editor.Backends().Compiler.(type) {
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case CanvasBackend, *CanvasBackend:
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case OFDCompiler, *OFDCompiler:
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deferredClip = true
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default:
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return fallback()
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}
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style, _, _ := node.style()
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for _, clip := range style.Clips {
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if len(clip.Text) != 0 {
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return fallback()
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}
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}
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geometry, err := p.renderer.Geometry()
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if err != nil {
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return nil, Box{}, err
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}
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switch geometry.(type) {
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case CanvasBackend, *CanvasBackend:
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default:
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return fallback()
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}
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var path GeometryPath
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evenOdd := false
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if node.path != nil {
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path, err = pdfGeometryPath(p.ctx, node.path.Path, p.matrix)
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evenOdd = node.path.Path.EvenOdd
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} else {
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path, err = geometry.Transform(GeometryPath(basegeom.Rectangle(Box{W: 1, H: 1})), MatrixFromValues([6]float64(p.matrix.Mul(node.image.Matrix))))
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}
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if err != nil {
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return nil, Box{}, err
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}
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if len(path) == 0 {
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return nil, Box{}, fmt.Errorf("empty PDF painted path")
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}
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path = GeometryPath(basegeom.Close(basegeom.Path(path)))
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clip, err := p.coverageClip(style.Clips, geometry)
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if err != nil || len(clip) == 0 {
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return nil, Box{}, err
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}
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compiler := semanticCompiler{geometry: geometry, page: &RasterPage{Width: p.pageWidth, Height: p.pageHeight, DPI: p.rasterDPI}}
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var bounds pdfPointBounds
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for _, segment := range path {
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if segment.Verb != GeometryClose {
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bounds.add(pdfgo.Point{X: segment.End.X, Y: segment.End.Y})
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}
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if segment.Verb == GeometryCubic {
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bounds.add(pdfgo.Point{X: segment.Control1.X, Y: segment.Control1.Y})
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bounds.add(pdfgo.Point{X: segment.Control2.X, Y: segment.Control2.Y})
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}
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}
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boundary := GeometryPath(basegeom.Rectangle(bounds.box()))
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clip, err = clipGeometry(geometry, clip, &boundary)
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if err != nil {
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return nil, Box{}, err
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}
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if deferredClip {
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if err := compiler.command(path, Paint{Color: color.RGBA{255, 255, 255, 255}}, evenOdd, &clip, IdentityMatrix, nil); err != nil {
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return nil, Box{}, err
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}
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return p.groupSceneBounds(compiler.page)
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}
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box, err := geometry.Bounds(path)
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if err != nil {
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return nil, Box{}, err
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}
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rect, rectangle := basegeom.RectangleBounds(basegeom.Path(clip))
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if !rectangle || box.X < rect.X || box.Y < rect.Y || box.X+box.W > rect.X+rect.W || box.Y+box.H > rect.Y+rect.H {
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if evenOdd {
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path, err = geometry.Normalize(path, true)
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if err != nil {
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return nil, Box{}, err
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}
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evenOdd = false
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}
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var clipped GeometryPath
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var linear bool
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var clipErr error
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if rectangle {
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clipped, linear, clipErr = clipLinearFillGeometry(path, clip)
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}
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if clipErr != nil {
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return nil, Box{}, clipErr
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}
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if linear {
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path = clipped
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} else {
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path, err = clipGeometry(geometry, path, &clip)
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if err != nil {
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return nil, Box{}, err
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}
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}
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}
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if err := compiler.command(path, Paint{Color: color.RGBA{255, 255, 255, 255}}, evenOdd, nil, IdentityMatrix, nil); err != nil {
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return nil, Box{}, err
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}
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return p.groupSceneBounds(compiler.page)
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}
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// coverageClip 按完整路径、变换和页面范围复用只读裁剪，不缓存失败结果
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// 入参: paths 无文字裁剪的路径集合, geometry 几何后端
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// 返回: GeometryPath 共享只读轮廓, error 几何或取消错误
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func (p *pdfImporter) coverageClip(paths []pdfgo.Path, geometry GeometryBackend) (GeometryPath, error) {
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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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clip := GeometryPath(basegeom.Rectangle(Box{W: p.pageWidth, H: p.pageHeight}))
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if len(paths) == 0 {
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return clip, nil
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}
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hash := sha256.New()
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var size [16]byte
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binary.LittleEndian.PutUint64(size[:8], math.Float64bits(p.pageWidth))
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binary.LittleEndian.PutUint64(size[8:], math.Float64bits(p.pageHeight))
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hash.Write(size[:])
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for _, path := range paths {
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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 nil, err
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}
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hash.Write(key[:])
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}
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var key [32]byte
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hash.Sum(key[:0])
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cache := p.compositingCache().clipCache()
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if cached, ok := cache.get(key); ok {
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return cached, nil
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}
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for _, source := range paths {
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part, err := pdfGeometryPath(p.ctx, source, p.matrix)
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if err != nil {
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return nil, err
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}
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part = GeometryPath(basegeom.Close(basegeom.Path(part)))
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if _, rectangle := basegeom.RectangleBounds(basegeom.Path(part)); source.EvenOdd && !rectangle {
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part, err = geometry.Normalize(part, true)
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if err != nil {
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return nil, err
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}
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}
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clip, err = clipGeometry(geometry, part, &clip)
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if err != nil {
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return nil, err
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}
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if len(clip) == 0 {
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break
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}
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}
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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 len(clip) <= (cache.limit-128)/112 {
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cache.put(key, clip, 128+len(clip)*112)
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}
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return clip, nil
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}
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// pdfGlyphPath 将OFD字形几何交给PDF路径适配器转换
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// 入参: outline 字形轮廓, matrix 字形到页面的变换
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// 返回: pdfgo.Path 页面路径, error 非字体轮廓指令
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func pdfGlyphPath(outline GeometryPath, matrix pdfgo.Matrix) (pdfgo.Path, error) {
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return codecpdf.GlyphPath(basegeom.Path(outline), matrix)
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}
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// pdfNumbers 按OFD数值格式序列化坐标
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// 入参: values 数值列表
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// 返回: string 空格分隔的数值
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func pdfNumbers(values ...float64) string {
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var buffer [128]byte
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data := buffer[:0]
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for n, v := range values {
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if n != 0 {
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data = append(data, ' ')
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}
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data = strconv.AppendFloat(data, v, 'g', -1, 64)
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}
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return string(data)
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}
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// pdfDashPattern 换算PDF虚线长度，将单值数组展开为等长线段与间隔
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// 入参: dash PDF虚线数组, scale 坐标缩放比例
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// 返回: string OFD虚线数组
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func pdfDashPattern(dash []float64, scale float64) string {
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if len(dash) == 0 {
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return ""
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}
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values := make([]float64, max(2, len(dash)))
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for i, value := range dash {
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values[i] = value * scale
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}
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if len(dash) == 1 {
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values[1] = values[0]
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}
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return pdfNumbers(values...)
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}
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// pdfBoundary 序列化对象边界
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// 入参: b 对象边界
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// 返回: string OFD边界数据
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func pdfBoundary(b Box) string { return pdfNumbers(b.X, b.Y, b.W, b.H) }
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// pdfBounds 计算点集合的包围框
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// 入参: points 坐标点集合
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// 返回: Box 包围框
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func pdfBounds(points []pdfgo.Point) Box {
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var bounds pdfPointBounds
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for _, point := range points {
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bounds.add(point)
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}
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return bounds.box()
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}
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// add 按原顺序累计一个控制点的最小和最大坐标
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// 入参: point 坐标点
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func (b *pdfPointBounds) add(point pdfgo.Point) {
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if !b.found {
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b.minX, b.minY, b.maxX, b.maxY = point.X, point.Y, point.X, point.Y
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b.found = true
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}
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b.minX, b.minY = math.Min(b.minX, point.X), math.Min(b.minY, point.Y)
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b.maxX, b.maxY = math.Max(b.maxX, point.X), math.Max(b.maxY, point.Y)
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}
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// box 取得原精度边界，空集合仍返回零值
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// 返回: Box 坐标范围
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func (b *pdfPointBounds) box() Box {
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if !b.found {
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return Box{}
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}
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return Box{X: b.minX, Y: b.minY, W: math.Max(b.maxX-b.minX, 1e-6), H: math.Max(b.maxY-b.minY, 1e-6)}
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}
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// pathBoundsContext 逐段计算变换后的控制点边界，不创建临时点集合
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// 入参: ctx 取消上下文, path PDF路径
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// 返回: Box 控制点边界，空路径返回零值, error 取消错误
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func (p *pdfImporter) pathBoundsContext(ctx context.Context, path pdfgo.Path) (Box, error) {
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if err := ctx.Err(); err != nil {
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return Box{}, err
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}
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minX, minY, maxX, maxY := math.Inf(1), math.Inf(1), math.Inf(-1), math.Inf(-1)
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found := false
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for _, segment := range path.Segments {
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if err := ctx.Err(); err != nil {
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return Box{}, err
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}
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for index, point := range segment.Points {
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if index&255 == 0 {
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if err := ctx.Err(); err != nil {
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return Box{}, err
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}
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}
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point = p.matrix.Apply(point)
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minX, minY = math.Min(minX, point.X), math.Min(minY, point.Y)
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maxX, maxY = math.Max(maxX, point.X), math.Max(maxY, point.Y)
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found = true
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}
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}
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if err := ctx.Err(); err != nil {
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return Box{}, err
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}
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if !found {
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return Box{}, nil
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}
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return Box{X: minX, Y: minY, W: math.Max(maxX-minX, 1e-6), H: math.Max(maxY-minY, 1e-6)}, nil
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}
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// pathDataContext 转换路径并在分段处理时检查取消
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// 入参: ctx 取消上下文, path PDF路径, origin 对象边界
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// 返回: string OFD路径数据, error 取消错误
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func (p *pdfImporter) pathDataContext(ctx context.Context, path pdfgo.Path, origin Box) (string, error) {
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if err := ctx.Err(); err != nil {
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return "", err
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}
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data := make([]byte, 0, len(path.Segments)*48)
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for index, segment := range path.Segments {
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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 index != 0 {
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data = append(data, ' ')
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}
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data = append(data, segment.Operator...)
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for _, point := range segment.Points {
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point = p.matrix.Apply(point)
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data = append(data, ' ')
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data = strconv.AppendFloat(data, point.X-origin.X, 'g', -1, 64)
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data = append(data, ' ')
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data = strconv.AppendFloat(data, point.Y-origin.Y, 'g', -1, 64)
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}
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}
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if err := ctx.Err(); err != nil {
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return "", err
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}
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return string(data), nil
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}
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// path 合并相同状态下的不透明描边，保留独立子路径与绘制顺序
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// 入参: mark PDF路径绘制信息
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// 返回: error 错误信息
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func (p *pdfImporter) path(mark pdfgo.PathMark) error {
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if mark.Style.BlendMode != "" && mark.Style.BlendMode != "Normal" && mark.Style.BlendMode != "Compatible" {
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return &pdfgo.UnsupportedError{Feature: "path blend mode " + string(mark.Style.BlendMode)}
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}
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if !mark.Stroke || mark.Fill || mark.Style.Stroke.Alpha != 1 {
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if err := p.flushPath(); err != nil {
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return err
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}
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return p.appendPath(mark)
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}
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if p.pendingPath != nil && (p.pendingPath.StrokeMatrix != mark.StrokeMatrix || !reflect.DeepEqual(p.pendingPath.Style, mark.Style)) {
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if err := p.flushPath(); err != nil {
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return err
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}
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}
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if p.pendingPath == nil {
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p.pendingPath = &mark
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} else {
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p.pendingPath.Path.Segments = append(p.pendingPath.Path.Segments, mark.Path.Segments...)
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}
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if len(p.pendingPath.Path.Segments) >= 512 {
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return p.flushPath()
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}
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return nil
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}
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// flushPath 写入连续描边批次，保持后续图元的叠放位置
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// 返回: error 转换错误
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func (p *pdfImporter) flushPath() error {
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if p.pendingPath == nil {
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return nil
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}
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mark := *p.pendingPath
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p.pendingPath = nil
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return p.appendPath(mark)
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}
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// appendPath 添加独立可编辑路径
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// 入参: mark PDF路径绘制信息
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// 返回: error 错误信息
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func (p *pdfImporter) appendPath(mark pdfgo.PathMark) error {
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var err error
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mark.Style, err = p.maskStyle(mark.Style)
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if err != nil {
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if p.rasterMaskAllowed(err) {
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mask := mark.Style.SoftMask
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mark.Style.SoftMask = nil
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return p.rasterGroup(pdfgo.GroupMark{Alpha: 1, SoftMask: mask}, func(v pdfgo.Visitor) error { return v.Path(mark) })
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}
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return err
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}
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if mark.Fill && mark.Style.FillOverprint && pdfOverprintNeedsSeparation(mark.Style.Fill) || mark.Stroke && mark.Style.StrokeOverprint && pdfOverprintNeedsSeparation(mark.Style.Stroke) {
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return &pdfgo.UnsupportedError{Feature: "color separation overprint"}
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}
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if p.warning != nil && (mark.Fill && p.gradientError(mark.Style.Fill) != nil || mark.Stroke && p.gradientError(mark.Style.Stroke) != nil) {
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if err := p.ctx.Err(); err != nil {
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return err
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}
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return p.gradientPath(mark)
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}
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box, err := p.pathBoundsContext(p.ctx, mark.Path)
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if err != nil {
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return err
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}
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if box == (Box{}) {
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return fmt.Errorf("empty PDF painted path")
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}
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scale := math.Hypot(p.matrix[0], p.matrix[1])
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drawing, origin, ctm := *p, box, ""
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marginScale := scale
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if mark.StrokeMatrix != (pdfgo.Matrix{}) {
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inverse, ok := mark.StrokeMatrix.Inverse()
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if !ok {
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return fmt.Errorf("invalid PDF stroke matrix")
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}
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drawing.matrix, origin, scale = inverse, Box{}, 1
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m := p.matrix.Mul(mark.StrokeMatrix)
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marginScale = math.Max(math.Hypot(m[0], m[2]), math.Hypot(m[1], m[3]))
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}
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if mark.Stroke {
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margin := mark.Style.LineWidth * marginScale / 2 * math.Max(1, mark.Style.MiterLimit)
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box = Box{X: box.X - margin, Y: box.Y - margin, W: box.W + 2*margin, H: box.H + 2*margin}
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}
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if mark.StrokeMatrix == (pdfgo.Matrix{}) {
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origin = box
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} else {
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m := p.matrix.Mul(mark.StrokeMatrix)
|
|
m[4], m[5] = m[4]-box.X, m[5]-box.Y
|
|
ctm = pdfNumbers(m[:]...)
|
|
}
|
|
paint := func(value pdfgo.Paint) (*FillColor, error) {
|
|
if value.Tiling != nil || pdfGradientPattern(value) {
|
|
return p.paintColor(value, box)
|
|
}
|
|
return drawing.paintColor(value, origin)
|
|
}
|
|
fillColor, strokePaint := p.color(mark.Style.Fill), p.color(mark.Style.Stroke)
|
|
if mark.Fill {
|
|
fillColor, err = paint(mark.Style.Fill)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if mark.Stroke {
|
|
strokePaint, err = paint(mark.Style.Stroke)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
strokeColor := StrokeColor(*strokePaint)
|
|
clips, err := p.clips(mark.Style.Clips, box)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
data, err := drawing.pathDataContext(p.ctx, mark.Path, origin)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
object := PathObject{Boundary: pdfBoundary(box), CTM: ctm, AbbreviatedData: data, Fill: &mark.Fill, Stroke: &mark.Stroke, FillColor: fillColor, StrokeColor: &strokeColor, LineWidth: mark.Style.LineWidth * scale, Cap: []string{"Butt", "Round", "Square"}[mark.Style.Cap], Join: []string{"Miter", "Round", "Bevel"}[mark.Style.Join], MiterLimit: mark.Style.MiterLimit, Clips: clips}
|
|
object.LineWidthSet = object.LineWidth == 0
|
|
if mark.Path.EvenOdd {
|
|
object.Rule = "Even-Odd"
|
|
}
|
|
if len(mark.Style.Dash) > 0 {
|
|
object.DashPattern = pdfDashPattern(mark.Style.Dash, scale)
|
|
phase := mark.Style.DashPhase * scale
|
|
object.DashOffset = &phase
|
|
}
|
|
p.appendObject(GraphicObject{Type: "PathObject", PathObject: object})
|
|
p.report.PathObjects++
|
|
return nil
|
|
}
|