添加图层剪切功能

src/component/Canvas/CanvasEditor/commands/RasterizeLayerCommand.js

@@ -493,7 +493,7 @@ export class ExportLayerToImageCommand extends Command {
     this._collectLayersAndObjects();
   }
 
-  async execute() {
+  async execute(isDownload = true) {
     if (!this.layer) {
       throw new Error(`图层 ${this.layerId} 不存在`);
     }
@@ -532,18 +532,21 @@ export class ExportLayerToImageCommand extends Command {
         fabricObjects: this.objectsToRasterize,
         isReturenDataURL: true,
         maskObject: clippingMaskFabricObject || null, // 不处理遮罩
+		scaleFactor: isDownload ? 2 : 1,
       });
 
+	  
       // 模拟浏览器下载
-      const link = document.createElement("a");
-      link.href = imageBase64;
-      link.download = `${this.layer.name}.png`;
-      document.body.appendChild(link);
-      link.click();
-      document.body.removeChild(link);
-
+      if (isDownload) {
+        const link = document.createElement("a");
+        link.href = imageBase64;
+        link.download = `${this.layer.name}.png`;
+        document.body.appendChild(link);
+        link.click();
+        document.body.removeChild(link);
+      }
       console.log(`✅ 图层 ${this.layer.name} 导出完成`);
-      return true;
+      return imageBase64;
     } catch (error) {
       console.error("导出图层失败:", error);
       throw error;