tachiyomi/app/src/main/res/layout/chapter_image.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/page_image_view" />

</LinearLayout>