优化

app/src/main/java/io/legado/app/model/BookCover.kt

@@ -64,23 +64,29 @@ object BookCover {
         }.getOrDefault(appCtx.resources.getDrawable(R.drawable.image_cover_default, null))
     }
 
+    /**
+     * 加载封面
+     */
     fun load(
         context: Context,
         path: String?,
         loadOnlyWifi: Boolean = false
     ): RequestBuilder<Drawable> {
-        return if (AppConfig.useDefaultCover) {
-            ImageLoader.load(context, defaultDrawable)
+        if (AppConfig.useDefaultCover) {
+            return ImageLoader.load(context, defaultDrawable)
                 .centerCrop()
-        } else {
+        }
         val options = RequestOptions().set(OkHttpModelLoader.loadOnlyWifiOption, loadOnlyWifi)
-            ImageLoader.load(context, path)
+        return ImageLoader.load(context, path)
             .apply(options)
             .placeholder(defaultDrawable)
             .error(defaultDrawable)
-        }
+            .centerCrop()
     }
 
+    /**
+     * 加载模糊封面
+     */
     fun loadBlur(
         context: Context,
         path: String?,
@@ -88,17 +94,16 @@ object BookCover {
     ): RequestBuilder<Drawable> {
         val loadBlur = ImageLoader.load(context, defaultDrawable)
             .transform(BlurTransformation(25), CenterCrop())
-        return if (AppConfig.useDefaultCover) {
-            loadBlur
-        } else {
+        if (AppConfig.useDefaultCover) {
+            return loadBlur
+        }
         val options = RequestOptions().set(OkHttpModelLoader.loadOnlyWifiOption, loadOnlyWifi)
-            ImageLoader.load(context, path)
+        return ImageLoader.load(context, path)
             .apply(options)
             .transform(BlurTransformation(25), CenterCrop())
             .transition(DrawableTransitionOptions.withCrossFade(1500))
             .thumbnail(loadBlur)
     }
-    }
 
     suspend fun searchCover(book: Book): String? {
         val config = coverRuleConfig