蒙版和限制字数

@@ -2125,13 +2125,26 @@ class Utils {
     //   ..strokeCap = StrokeCap.butt
     //   ..strokeWidth = 2;
     final paint = Paint()
-      ..color = Color.fromRGBO(0, 0, 0, 0.8)
+      ..color = Color.fromRGBO(81, 81, 81, 0.4)
       ..style = PaintingStyle.fill;
 
-    canvas.drawRect(Rect.fromLTWH(0, 0, 500, 400), paint);
+    // canvas.drawRect(Rect.fromLTWH(0, 0, 500, 400), paint);
 
-    canvas.drawImage(images, Offset(0, 0), paint);
-    
+    // canvas.drawImage(images, Offset(0, 0), paint);
+
+          // 定义源矩形，通常是图像的全部
+      final Rect source = Rect.fromLTWH(0.0, 0.0, images.width.toDouble(), images.height.toDouble());
+      // 定义目标矩形，即画布的大小
+      final Rect destination = Rect.fromLTWH(0.0, 0.0, 500, 400);
+      // 绘制图像
+      canvas.drawImageRect(images, source, destination, paint);
+
+    // 在画布上绘制图片，使用BoxFit来适配画布大小
+    // canvas.drawImageRect(
+    //     images,
+    //     Rect.fromLTWH(0, 0, images.width.toDouble(), images.height.toDouble()),
+    //     Rect.fromLTWH(0, 0, images.width.toDouble(), images.height.toDouble()),
+    //     paint);
 
     // 绘制文字
     ui.ParagraphBuilder pb2 = ui.ParagraphBuilder(ui.ParagraphStyle(