mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
116 lines
3.2 KiB
Go
116 lines
3.2 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 "github.com/xiaoqidun/pdfgo"
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// disjointText 检查实际字形轮廓是否互不相交，允许无重叠挖空文字直接保留
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// 入参: node 隐式文字组
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// 返回: bool 是否互不相交, error 轮廓编译错误
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func (p *pdfImporter) disjointText(node pdfCompositeNode) (bool, error) {
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cache := p.compositingCache()
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if result, found := cache.textDisjoint[node.group]; found {
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return result, nil
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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 false, err
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}
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var inverse pdfgo.Matrix
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var boxes []Box
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for _, child := range node.children {
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mark := child.text
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if mark == nil {
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mark = child.glyph
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}
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if mark == nil || len(mark.Glyphs) != 1 {
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return false, nil
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}
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if inverse == (pdfgo.Matrix{}) {
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var ok bool
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inverse, ok = p.matrix.Mul(mark.Matrix).Inverse()
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if !ok {
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return false, nil
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}
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}
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scene, _, err := p.compileGroup(func(local *pdfImporter) error {
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if child.group != nil {
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return child.coverage(local, false)
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}
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_, fill, stroke := child.style()
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if fill {
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if err := child.coverage(local, false); err != nil {
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return err
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}
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}
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if stroke {
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return child.coverage(local, true)
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}
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return nil
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})
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if err != nil {
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return false, err
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}
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if scene == nil {
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continue
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}
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var box Box
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for _, command := range scene.Commands {
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path := geometryFromRaster(command.Path)
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if command.Image != nil {
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b := command.Image.Bounds()
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path = geometryRectangle(Box{X: float64(b.Min.X), Y: float64(b.Min.Y), W: float64(b.Dx()), H: float64(b.Dy())})
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}
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path, err = geometry.Transform(path, MatrixFromValues([6]float64(command.Transform)))
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if err != nil {
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return false, err
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}
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if command.Stroke != nil {
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path, err = geometry.Stroke(path, *command.Stroke)
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if err != nil {
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return false, err
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}
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}
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path, err = geometry.Transform(path, MatrixFromValues([6]float64(inverse)))
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if err != nil {
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return false, err
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}
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bounds, err := geometry.Bounds(path)
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if err != nil {
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return false, err
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}
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box = unionTextBox(box, bounds)
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}
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if box.W <= 0 || box.H <= 0 {
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continue
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}
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for _, previous := range boxes {
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if box.X < previous.X+previous.W && previous.X < box.X+box.W && box.Y < previous.Y+previous.H && previous.Y < box.Y+box.H {
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if cache.textDisjoint == nil {
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cache.textDisjoint = make(map[*pdfgo.GroupMark]bool)
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}
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cache.textDisjoint[node.group] = false
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return false, nil
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}
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}
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boxes = append(boxes, box)
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}
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if cache.textDisjoint == nil {
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cache.textDisjoint = make(map[*pdfgo.GroupMark]bool)
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}
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cache.textDisjoint[node.group] = true
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return true, nil
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}
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