Improve double-tap zoom in reader

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/BasePageHolder.kt

@@ -71,7 +71,7 @@ abstract class BasePageHolder<B : ViewBinding>(
 	}
 
 	protected fun SubsamplingScaleImageView.applyDownsampling(isForeground: Boolean) {
-		downsampling = when {
+		downSampling = when {
 			isForeground || !settings.isReaderOptimizationEnabled -> 1
 			context.isLowRamDevice() -> 8
 			else -> 4

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/webtoon/WebtoonImageView.kt

@@ -97,8 +97,8 @@ class WebtoonImageView @JvmOverloads constructor(
 		setMeasuredDimension(desiredWidth, desiredHeight)
 	}
 
-	override fun onDownsamplingChanged() {
-		super.onDownsamplingChanged()
+	override fun onDownSamplingChanged() {
+		super.onDownSamplingChanged()
 		post {
 			adjustScale()
 		}

app/src/main/res/layout/item_page.xml

@@ -12,6 +12,7 @@
 		android:layout_height="match_parent"
 		android:defaultFocusHighlightEnabled="false"
 		android:focusable="true"
+		app:doubleTapZoomStyle="center"
 		app:restoreStrategy="deferred" />
 
 	<TextView