优化

app/src/main/java/io/legado/app/ui/book/read/page/provider/ImageProvider.kt

@@ -1,6 +1,7 @@
 package io.legado.app.ui.book.read.page.provider
 
 import android.graphics.Bitmap
+import android.util.Size
 import io.legado.app.R
 import io.legado.app.constant.AppLog.putDebug
 import io.legado.app.data.entities.Book
@@ -9,25 +10,67 @@ import io.legado.app.help.BookHelp
 import io.legado.app.help.coroutine.Coroutine
 import io.legado.app.help.glide.ImageLoader
 import io.legado.app.model.localBook.EpubFile
-import io.legado.app.utils.FileUtils
 import io.legado.app.utils.BitmapUtils
+import io.legado.app.utils.FileUtils
 import io.legado.app.utils.isXml
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.suspendCancellableCoroutine
 import splitties.init.appCtx
 import java.io.File
 import java.io.FileOutputStream
+import kotlin.coroutines.resume
 
 object ImageProvider {
 
     private val errorBitmap: Bitmap? by lazy {
         BitmapUtils.decodeBitmap(
-           appCtx,
-           R.drawable.image_loading_error,
-           ChapterProvider.visibleWidth,
-           ChapterProvider.visibleHeight
+            appCtx,
+            R.drawable.image_loading_error,
+            ChapterProvider.visibleWidth,
+            ChapterProvider.visibleHeight
         )
     }
 
+    private suspend fun cacheImage(
+        book: Book,
+        src: String,
+        bookSource: BookSource?
+    ): File {
+        val vFile = BookHelp.getImage(book, src)
+        if (!vFile.exists()) {
+            if (book.isEpub()) {
+                EpubFile.getImage(book, src)?.use { input ->
+                    val newFile = FileUtils.createFileIfNotExist(vFile.absolutePath)
+                    @Suppress("BlockingMethodInNonBlockingContext")
+                    FileOutputStream(newFile).use { output ->
+                        input.copyTo(output)
+                    }
+                }
+            } else {
+                BookHelp.saveImage(bookSource, book, src)
+            }
+        }
+        return vFile
+    }
+
+    suspend fun getImageSize(
+        book: Book,
+        src: String,
+        bookSource: BookSource?
+    ): Size {
+        val file = cacheImage(book, src, bookSource)
+        return suspendCancellableCoroutine { block ->
+            kotlin.runCatching {
+                ImageLoader.loadBitmap(appCtx, file.absolutePath).submit()
+                    .getSize { width, height ->
+                        block.resume(Size(width, height))
+                    }
+            }.onFailure {
+                block.cancel(it)
+            }
+        }
+    }
+
     fun getImage(
         book: Book,
         src: String,