feat(字体渲染): 加强字体兼容性

ofdgo_object.go

@@ -0,0 +1,175 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"encoding/xml"
+	"strconv"
+)
+
+// UnmarshalXML 解析图层并保留对象顺序
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (l *Layer) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	*l = Layer{}
+	l.ID = attrValue(start, "ID")
+	l.DrawParam = attrValue(start, "DrawParam")
+	for {
+		tok, err := d.Token()
+		if err != nil {
+			return err
+		}
+		switch node := tok.(type) {
+		case xml.StartElement:
+			if err := l.decodeObject(d, node); err != nil {
+				return err
+			}
+		case xml.EndElement:
+			if node.Name.Local == start.Name.Local {
+				return nil
+			}
+		}
+	}
+}
+
+// decodeObject 解析图层子对象
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (l *Layer) decodeObject(d *xml.Decoder, start xml.StartElement) error {
+	switch start.Name.Local {
+	case "TextObject":
+		var obj TextObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		l.TextObject = append(l.TextObject, obj)
+		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
+	case "PathObject":
+		var obj PathObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		l.PathObject = append(l.PathObject, obj)
+		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
+	case "ImageObject":
+		var obj ImageObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		l.ImageObject = append(l.ImageObject, obj)
+		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
+	case "CompositeGraphicUnit", "CompositeObject":
+		var obj CompositeGraphicUnit
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		l.CompositeGraphicUnit = append(l.CompositeGraphicUnit, obj)
+		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
+	default:
+		return d.Skip()
+	}
+	return nil
+}
+
+// UnmarshalXML 解析复合图元并保留对象顺序
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (c *CompositeGraphicUnit) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	*c = CompositeGraphicUnit{}
+	c.ID = attrValue(start, "ID")
+	c.BaseLoc = attrValue(start, "BaseLoc")
+	c.ResourceID = attrValue(start, "ResourceID")
+	c.Boundary = attrValue(start, "Boundary")
+	c.CTM = attrValue(start, "CTM")
+	c.DrawParam = attrValue(start, "DrawParam")
+	if value := attrValue(start, "Alpha"); value != "" {
+		if alpha, err := strconv.Atoi(value); err == nil {
+			c.Alpha = &alpha
+		}
+	}
+	for {
+		tok, err := d.Token()
+		if err != nil {
+			return err
+		}
+		switch node := tok.(type) {
+		case xml.StartElement:
+			if err := c.decodeObject(d, node); err != nil {
+				return err
+			}
+		case xml.EndElement:
+			if node.Name.Local == start.Name.Local {
+				return nil
+			}
+		}
+	}
+}
+
+// decodeObject 解析复合图元子对象
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (c *CompositeGraphicUnit) decodeObject(d *xml.Decoder, start xml.StartElement) error {
+	switch start.Name.Local {
+	case "TextObject":
+		var obj TextObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		c.TextObject = append(c.TextObject, obj)
+		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
+	case "PathObject":
+		var obj PathObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		c.PathObject = append(c.PathObject, obj)
+		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
+	case "ImageObject":
+		var obj ImageObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		c.ImageObject = append(c.ImageObject, obj)
+		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
+	case "CompositeGraphicUnit", "CompositeObject":
+		var obj CompositeGraphicUnit
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return err
+		}
+		c.CompositeGraphicUnit = append(c.CompositeGraphicUnit, obj)
+		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
+	case "Clips":
+		var clips Clips
+		if err := d.DecodeElement(&clips, &start); err != nil {
+			return err
+		}
+		c.Clips = &clips
+	default:
+		return d.Skip()
+	}
+	return nil
+}
+
+// attrValue 获取XML属性值
+// 入参: start 起始节点, name 属性名
+// 返回: string 属性值
+func attrValue(start xml.StartElement, name string) string {
+	for _, attr := range start.Attr {
+		if attr.Name.Local == name {
+			return attr.Value
+		}
+	}
+	return ""
+}