feat(扩展功能): 更好的支持WASM

ofdgo_font_native.go

@@ -0,0 +1,40 @@
+// 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.
+
+//go:build !js || !wasm
+
+package ofdgo
+
+import "github.com/tdewolff/canvas"
+
+// loadDefaultFonts 加载默认字体
+// 返回: bool 是否加载成功
+func (r *Renderer) loadDefaultFonts() bool {
+	sysFonts := []string{
+		"SimHei", "Microsoft YaHei", "SimSun", "KaiTi", "FangSong",
+		"Arial", "Segoe UI", "Times New Roman",
+	}
+	for _, name := range sysFonts {
+		if err := r.fontFamily.LoadSystemFont(name, canvas.FontRegular); err == nil {
+			return true
+		}
+	}
+	return false
+}
+
+// canLoadSystemFonts 判断是否可以加载系统字体
+// 返回: bool 是否可以加载系统字体
+func canLoadSystemFonts() bool {
+	return true
+}