Support more image formats for covers (#5524)

* Add TachiyomiImageDecoder for Coil

Is currently used to decode AVIF and JPEG XL images.

* LocalSource: Check against file name for cover

This allows file with all supported formats to be set as cover

* TachiyomiImageDecoder: Handle HEIF on Android 7 and older

app/src/main/java/eu/kanade/tachiyomi/data/coil/TachiyomiImageDecoder.kt

@@ -0,0 +1,53 @@
+package eu.kanade.tachiyomi.data.coil
+
+import android.content.res.Resources
+import android.os.Build
+import androidx.core.graphics.drawable.toDrawable
+import coil.bitmap.BitmapPool
+import coil.decode.DecodeResult
+import coil.decode.Decoder
+import coil.decode.Options
+import coil.size.Size
+import eu.kanade.tachiyomi.util.system.ImageUtil
+import okio.BufferedSource
+import tachiyomi.decoder.ImageDecoder
+
+/**
+ * A [Decoder] that uses built-in [ImageDecoder] to decode images that is not supported by the system.
+ */
+class TachiyomiImageDecoder(private val resources: Resources) : Decoder {
+
+    override fun handles(source: BufferedSource, mimeType: String?): Boolean {
+        val type = source.peek().inputStream().use {
+            ImageUtil.findImageType(it)
+        }
+        return when (type) {
+            ImageUtil.ImageType.AVIF, ImageUtil.ImageType.JXL -> true
+            ImageUtil.ImageType.HEIF -> Build.VERSION.SDK_INT < Build.VERSION_CODES.O
+            else -> false
+        }
+    }
+
+    override suspend fun decode(
+        pool: BitmapPool,
+        source: BufferedSource,
+        size: Size,
+        options: Options
+    ): DecodeResult {
+        val decoder = source.use {
+            ImageDecoder.newInstance(it.inputStream())
+        }
+
+        check(decoder != null && decoder.width > 0 && decoder.height > 0) { "Failed to initialize decoder." }
+
+        val bitmap = decoder.decode(rgb565 = options.allowRgb565)
+        decoder.recycle()
+
+        check(bitmap != null) { "Failed to decode image." }
+
+        return DecodeResult(
+            drawable = bitmap.toDrawable(resources),
+            isSampled = false
+        )
+    }
+}