mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-30 01:27:26 +08:00
675 lines
21 KiB
Go
675 lines
21 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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// 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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// 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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if node.path != nil && pdfPaintedPathEmpty(node.path.Path) {
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return nil, Box{}, p.emptyPaintedPath()
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}
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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{}, p.emptyPaintedPath()
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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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// path 保留每次路径绘制操作，重叠描边不合并为单次绘制
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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 err := p.ctx.Err(); err != nil {
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return err
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}
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if pdfPaintedPathEmpty(mark.Path) {
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return p.emptyPaintedPath()
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}
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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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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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if pdfPaintedPathEmpty(mark.Path) {
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return p.emptyPaintedPath()
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}
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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 && codecpdf.OverprintNeedsSeparation(mark.Style.Fill) || mark.Stroke && mark.Style.StrokeOverprint && codecpdf.OverprintNeedsSeparation(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 := codecpdf.PathBounds(p.ctx, mark.Path, p.matrix)
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if err != nil {
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return err
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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)
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m[4], m[5] = m[4]-box.X, m[5]-box.Y
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ctm = pdfNumbers(m[:]...)
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}
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paint := func(value pdfgo.Paint) (*FillColor, error) {
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if value.Tiling == nil && value.Axial == nil && value.Radial == nil && value.Mesh == nil && value.Function == nil && value.Shading == nil {
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return p.color(value, mark.Style.RenderingIntent)
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}
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if value.Tiling != nil || pdfGradientPattern(value) {
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return p.paintColor(value, box, mark.Style.RenderingIntent)
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}
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return drawing.paintColor(value, origin, mark.Style.RenderingIntent)
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}
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fillColor, err := p.color(mark.Style.Fill, mark.Style.RenderingIntent)
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if err != nil {
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return err
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}
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strokePaint, err := p.color(mark.Style.Stroke, mark.Style.RenderingIntent)
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if err != nil {
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return err
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}
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if mark.Fill {
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fillColor, err = paint(mark.Style.Fill)
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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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if mark.Stroke {
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strokePaint, err = paint(mark.Style.Stroke)
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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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strokeColor := StrokeColor(*strokePaint)
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clips, err := p.clips(mark.Style.Clips, box)
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if err != nil {
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return err
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}
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data, err := codecpdf.PathData(p.ctx, mark.Path, drawing.matrix, origin)
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if err != nil {
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return err
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}
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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}
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object.LineWidthSet = object.LineWidth == 0
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if mark.Path.EvenOdd {
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object.Rule = "Even-Odd"
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}
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if len(mark.Style.Dash) > 0 {
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object.DashPattern = pdfDashPattern(mark.Style.Dash, scale)
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phase := mark.Style.DashPhase * scale
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object.DashOffset = &phase
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}
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p.appendSequenceObject(GraphicObject{Type: "PathObject", PathObject: object}, mark.Sequence)
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p.report.PathObjects++
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return nil
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}
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// pdfPaintedPathEmpty 判断无坐标路径，不排除具有坐标的退化描边
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// 入参: path PDF路径
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// 返回: bool 是否没有坐标
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func pdfPaintedPathEmpty(path pdfgo.Path) bool {
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for _, segment := range path.Segments {
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if segment.Operator != "C" || len(segment.Points) != 0 {
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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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// emptyPaintedPath 按诊断策略忽略不绘制内容的空路径，严格模式仍拒绝
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// 返回: error 严格模式或取消错误
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func (p *pdfImporter) emptyPaintedPath() error {
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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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if p.warning == nil {
|
|
return fmt.Errorf("empty PDF painted path")
|
|
}
|
|
p.warning(pdfgo.Diagnostic{Message: "empty PDF painted path ignored"})
|
|
return p.ctx.Err()
|
|
}
|
|
|
|
// 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
|
|
// 入参: path 裁剪路径
|
|
// 返回: pdfClipPath 变换后的边界及编码, error 取消错误
|
|
func (p *pdfImporter) clipPath(path pdfgo.Path) (pdfClipPath, error) {
|
|
key, err := codecpdf.ClipPathKey(p.ctx, path, p.matrix)
|
|
if err != nil {
|
|
return pdfClipPath{}, err
|
|
}
|
|
if p.clipPaths == nil {
|
|
p.clipPaths = resourceCache[[32]byte, pdfClipPath](p.resources, 8<<20)
|
|
}
|
|
if cached, ok := p.clipPaths.get(key); ok {
|
|
return cached, nil
|
|
}
|
|
box, err := codecpdf.PathBounds(p.ctx, path, p.matrix)
|
|
if err != nil {
|
|
return pdfClipPath{}, err
|
|
}
|
|
data, err := codecpdf.PathData(p.ctx, path, p.matrix, box)
|
|
if err != nil {
|
|
return pdfClipPath{}, err
|
|
}
|
|
rule := "NonZero"
|
|
if path.EvenOdd {
|
|
rule = "Even-Odd"
|
|
}
|
|
boundary := pdfBoundary(box)
|
|
fill, stroke := true, false
|
|
result := pdfClipPath{box: box, data: data, path: &[1]PathObject{{Boundary: boundary, AbbreviatedData: data, Rule: rule, Fill: &fill, Stroke: &stroke}}}
|
|
p.clipPaths.put(key, result, len(data)+len(boundary)+512)
|
|
return result, nil
|
|
}
|
|
|
|
// sharedClipObjects 将连续重复的大裁剪区提取为复合对象，同步缓冲区及来源区段
|
|
// 入参: objects 本库生成且尚未分配标识的对象
|
|
// 返回: []GraphicObject 提取后的对象, error 资源创建或取消错误
|
|
func (p *pdfImporter) sharedClipObjects(objects []GraphicObject) ([]GraphicObject, error) {
|
|
var output []GraphicObject
|
|
var mapped pdfObjectBuffer
|
|
for start := 0; start < len(objects); {
|
|
if err := p.ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
clips := pdfPageClip(objects[start])
|
|
end := start + 1
|
|
if clips != nil {
|
|
for end < len(objects) && p.objects.origin(start).equal(p.objects.origin(end)) && pdfMatchesPageClip(objects[end], clips) {
|
|
if err := p.ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
end++
|
|
}
|
|
}
|
|
if end-start < 2 {
|
|
if output != nil {
|
|
mapped.recordOrigin(len(output), p.objects.origin(start))
|
|
output = append(output, objects[start])
|
|
}
|
|
start = end
|
|
continue
|
|
}
|
|
if output == nil {
|
|
output = append(make([]GraphicObject, 0, len(objects)), objects[:start]...)
|
|
if p.objects != nil {
|
|
for _, run := range p.objects.sequences {
|
|
if run.start >= start {
|
|
break
|
|
}
|
|
mapped.sequences = append(mapped.sequences, run)
|
|
}
|
|
}
|
|
}
|
|
members := objects[start:end:end]
|
|
for index := range members {
|
|
*editorObjectClips(&members[index]) = nil
|
|
}
|
|
id, err := p.objectValidation().addOwnedVector(p.ctx, members, p.pageWidth, p.pageHeight)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
mapped.recordOrigin(len(output), p.objects.origin(start))
|
|
output = append(output, GraphicObject{Type: "CompositeObject", CompositeGraphicUnit: CompositeGraphicUnit{
|
|
Boundary: pdfBoundary(Box{W: p.pageWidth, H: p.pageHeight}), ResourceID: id, Clips: clips,
|
|
}})
|
|
start = end
|
|
}
|
|
if output == nil {
|
|
return objects, nil
|
|
}
|
|
if p.objects != nil {
|
|
mapped.parts = [][]GraphicObject{output}
|
|
mapped.size = len(output)
|
|
*p.objects = mapped
|
|
}
|
|
return output, nil
|
|
}
|
|
|
|
// 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
|
|
// 入参: object 导入对象
|
|
// 返回: *Clips 页面坐标裁剪，不满足提取条件时为空
|
|
func pdfPageClip(object GraphicObject) *Clips {
|
|
if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "ImageObject" {
|
|
return nil
|
|
}
|
|
clips := *editorObjectClips(&object)
|
|
if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) == 0 {
|
|
return nil
|
|
}
|
|
boundary, _ := editorGeometry(object)
|
|
box, err := ParseBox(boundary)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
translation := ""
|
|
if box.X != 0 || box.Y != 0 {
|
|
translation = pdfNumbers(1, 0, 0, 1, -box.X, -box.Y)
|
|
}
|
|
bytes := 0
|
|
result := &Clips{Clip: make([]Clip, len(clips.Clip))}
|
|
for index, clip := range clips.Clip {
|
|
if len(clip.Area) != 1 || clip.Area[0].CTM != translation {
|
|
return nil
|
|
}
|
|
area := clip.Area[0]
|
|
area.CTM = ""
|
|
result.Clip[index].Area = []ClipArea{area}
|
|
for _, path := range area.Path {
|
|
bytes += len(path.AbbreviatedData)
|
|
}
|
|
}
|
|
if bytes < 2048 {
|
|
return nil
|
|
}
|
|
return result
|
|
}
|
|
|
|
// pdfMatchesPageClip 比较页面坐标裁剪，不将相同外接矩形视为相同路径
|
|
// 入参: object 导入对象, pageClip 已还原的裁剪区
|
|
// 返回: bool 是否可共享裁剪区
|
|
func pdfMatchesPageClip(object GraphicObject, pageClip *Clips) bool {
|
|
if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "ImageObject" {
|
|
return false
|
|
}
|
|
clips := *editorObjectClips(&object)
|
|
if clips == nil || clips.usesObjectMatrix() || len(clips.Clip) != len(pageClip.Clip) {
|
|
return false
|
|
}
|
|
boundary, _ := editorGeometry(object)
|
|
box, err := ParseBox(boundary)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
translation := ""
|
|
if box.X != 0 || box.Y != 0 {
|
|
translation = pdfNumbers(1, 0, 0, 1, -box.X, -box.Y)
|
|
}
|
|
for index, clip := range clips.Clip {
|
|
if len(clip.Area) != 1 || clip.Area[0].CTM != translation {
|
|
return false
|
|
}
|
|
area, expected := clip.Area[0], pageClip.Clip[index].Area[0]
|
|
if area.DrawParam != expected.DrawParam || !reflect.DeepEqual(area.Path, expected.Path) || !reflect.DeepEqual(area.Text, expected.Text) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// 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
|
|
// 入参: paths 裁剪路径, origin 对象边界
|
|
// 返回: *Clips OFD裁剪区域，无裁剪时为空, error 未解析的裁剪字形
|
|
func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) (*Clips, error) {
|
|
if len(paths) == 0 {
|
|
return nil, nil
|
|
}
|
|
var clips *Clips
|
|
var areas []ClipArea
|
|
translation := ""
|
|
for _, path := range paths {
|
|
if err := p.ctx.Err(); err != nil {
|
|
return nil, err
|
|
}
|
|
if codecpdf.ClipContainsBoundary(path, p.matrix, origin) {
|
|
continue
|
|
}
|
|
if clips == nil {
|
|
clips = &Clips{Clip: make([]Clip, 0, len(paths))}
|
|
areas = make([]ClipArea, len(paths))
|
|
if origin.X != 0 || origin.Y != 0 {
|
|
translation = pdfNumbers(1, 0, 0, 1, -origin.X, -origin.Y)
|
|
}
|
|
}
|
|
index := len(clips.Clip)
|
|
area := &areas[index]
|
|
area.CTM = translation
|
|
if len(path.Segments) != 0 {
|
|
encoded, err := p.clipPath(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
area.Path = encoded.path[:1:1]
|
|
}
|
|
for _, mark := range path.Text {
|
|
objects, ok := p.clipTexts[mark]
|
|
if !ok {
|
|
count := p.objects.len()
|
|
textCount := p.report.TextObjects
|
|
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 {
|
|
return nil, err
|
|
}
|
|
p.objects.truncate(count)
|
|
p.report.TextObjects = textCount
|
|
objects = p.clipTexts[mark]
|
|
}
|
|
if len(path.Text) == 1 {
|
|
area.Text = objects[:len(objects):len(objects)]
|
|
} else {
|
|
area.Text = append(area.Text, objects...)
|
|
}
|
|
}
|
|
if len(area.Path)+len(area.Text) == 0 {
|
|
fill, stroke := true, false
|
|
area.Path = []PathObject{{Boundary: "0 0 1 1", AbbreviatedData: "M 0 0 C", Fill: &fill, Stroke: &stroke}}
|
|
}
|
|
clips.Clip = append(clips.Clip, Clip{Area: areas[index : index+1 : index+1]})
|
|
}
|
|
return clips, nil
|
|
}
|