feat(image): 添加二维码圆形白色背景

- 创建比二维码大10像素的白色圆形背景
- 绘制白色圆形背景以突出显示二维码
- 裁剪二维码为圆形并绘制在白色背景上

src/main/java/com/ycwl/basic/image/watermark/operator/NormalWatermarkOperator.java

@@ -93,8 +93,20 @@ public class NormalWatermarkOperator implements IOperator {
         int offsetX = (newImage.getWidth() - newQrcodeWidth - QRCODE_OFFSET_X - Math.max(scenicLineWidth, datetimeLineWidth)) / 2;
         int offsetY = EXTRA_BORDER_PX + baseImage.getHeight() - OFFSET_Y - newQrcodeHeight;
         Shape originalClip = g2d.getClip();
-        Ellipse2D circle = new Ellipse2D.Double(offsetX, offsetY + QRCODE_OFFSET_Y, newQrcodeWidth, newQrcodeHeight);
-        g2d.setClip(circle);
+
+        // 创建比二维码大10像素的白色圆形背景
+        int whiteCircleSize = Math.max(newQrcodeWidth, newQrcodeHeight) + 10;
+        int whiteCircleX = offsetX - (whiteCircleSize - newQrcodeWidth) / 2;
+        int whiteCircleY = offsetY + QRCODE_OFFSET_Y - (whiteCircleSize - newQrcodeHeight) / 2;
+
+        // 绘制白色圆形背景
+        g2d.setColor(Color.WHITE);
+        Ellipse2D whiteCircle = new Ellipse2D.Double(whiteCircleX, whiteCircleY, whiteCircleSize, whiteCircleSize);
+        g2d.fill(whiteCircle);
+
+        // 用白色圆形尺寸裁切二维码(保持二维码原始尺寸,但用大圆裁切)
+        Ellipse2D qrcodeCircle = new Ellipse2D.Double(whiteCircleX, whiteCircleY, whiteCircleSize, whiteCircleSize);
+        g2d.setClip(qrcodeCircle);
         g2d.drawImage(qrcodeImage, offsetX, offsetY + QRCODE_OFFSET_Y, newQrcodeWidth, newQrcodeHeight, null);
         g2d.setClip(originalClip);