feat(文件拆分): 拆分字体图像基础能力

internal/base/image/input.go

@@ -0,0 +1,36 @@
+// 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 image
+
+import (
+	"context"
+	"io"
+)
+
+// contextInput 在读取图像编码时检查调用方取消状态
+type contextInput struct {
+	io.ReadCloser
+	context context.Context
+}
+
+// Read 检查取消状态后读取原始数据
+// 入参: data 数据缓冲区
+// 返回: int 读取字节数, error 读取或取消错误
+func (r contextInput) Read(data []byte) (int, error) {
+	if err := r.context.Err(); err != nil {
+		return 0, err
+	}
+	return r.ReadCloser.Read(data)
+}