优化bug

design1.html

@@ -677,11 +677,19 @@
                             }
                         }
                     }
+                    // 如果没有找到任何非透明像素，直接返回，不进行裁剪
+                    if (pix.x.length === 0 || pix.y.length === 0) {
+                        return;
+                    }
                     pix.x.sort(fn);
                     pix.y.sort(fn);
                     n = pix.x.length - 1;
                     w = pix.x[n] - pix.x[0];
                     h = pix.y[n] - pix.y[0];
+                    // 确保宽度和高度是有效的正数
+                    if (w <= 0 || h <= 0 || isNaN(w) || isNaN(h)) {
+                        return;
+                    }
                     var cut = ctx.getImageData(pix.x[0], pix.y[0], w, h);
                     canvas.width = w;
                     canvas.height = h;

design2.html

@@ -649,11 +649,19 @@
                             }
                         }
                     }
+                    // 如果没有找到任何非透明像素，直接返回，不进行裁剪
+                    if (pix.x.length === 0 || pix.y.length === 0) {
+                        return;
+                    }
                     pix.x.sort(fn);
                     pix.y.sort(fn);
                     n = pix.x.length - 1;
                     w = pix.x[n] - pix.x[0];
                     h = pix.y[n] - pix.y[0];
+                    // 确保宽度和高度是有效的正数
+                    if (w <= 0 || h <= 0 || isNaN(w) || isNaN(h)) {
+                        return;
+                    }
                     var cut = ctx.getImageData(pix.x[0], pix.y[0], w, h);
                     canvas.width = w;
                     canvas.height = h;