Fix color filter preview

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/colorfilter/ColorFilterConfigActivity.kt

@@ -68,10 +68,10 @@ class ColorFilterConfigActivity :
 
 		viewModel.colorFilter.observe(this, this::onColorFilterChanged)
 		viewModel.isLoading.observe(this, this::onLoadingChanged)
-		viewModel.preview.observe(this, this::onPreviewChanged)
 		viewModel.onDismiss.observeEvent(this) {
 			finishAfterTransition()
 		}
+		loadPreview(viewModel.preview)
 	}
 
 	override fun onValueChange(slider: Slider, value: Float, fromUser: Boolean) {
@@ -114,13 +114,13 @@ class ColorFilterConfigActivity :
 		viewBinding.imageViewAfter.colorFilter = readerColorFilter?.toColorFilter()
 	}
 
-	private fun onPreviewChanged(preview: MangaPage?) {
+	private fun loadPreview(page: MangaPage) {
-		if (preview == null) return
+		val data: Any = page.preview?.takeUnless { it.isEmpty() } ?: page
 		ImageRequest.Builder(this@ColorFilterConfigActivity)
-			.data(preview)
+			.data(data)
 			.scale(Scale.FILL)
 			.decodeRegion()
-			.tag(preview.source)
+			.tag(page.source)
 			.indicator(listOf(viewBinding.progressBefore, viewBinding.progressAfter))
 			.error(R.drawable.ic_error_placeholder)
 			.size(ViewSizeResolver(viewBinding.imageViewBefore))

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/colorfilter/ColorFilterConfigViewModel.kt

@@ -7,12 +7,10 @@ import kotlinx.coroutines.flow.MutableStateFlow
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableMangaPages
 import org.koitharu.kotatsu.core.parser.MangaDataRepository
-import org.koitharu.kotatsu.core.parser.MangaRepository
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.require
-import org.koitharu.kotatsu.parsers.model.MangaPage
 import org.koitharu.kotatsu.reader.domain.ReaderColorFilter
 import org.koitharu.kotatsu.reader.ui.colorfilter.ColorFilterConfigActivity.Companion.EXTRA_MANGA
 import javax.inject.Inject
@@ -20,7 +18,6 @@ import javax.inject.Inject
 @HiltViewModel
 class ColorFilterConfigViewModel @Inject constructor(
 	savedStateHandle: SavedStateHandle,
-	private val mangaRepositoryFactory: MangaRepository.Factory,
 	private val mangaDataRepository: MangaDataRepository,
 ) : BaseViewModel() {
 
@@ -29,27 +26,16 @@ class ColorFilterConfigViewModel @Inject constructor(
 	private var initialColorFilter: ReaderColorFilter? = null
 	val colorFilter = MutableStateFlow<ReaderColorFilter?>(null)
 	val onDismiss = MutableEventFlow<Unit>()
-	val preview = MutableStateFlow<MangaPage?>(null)
+	val preview = savedStateHandle.require<ParcelableMangaPages>(ColorFilterConfigActivity.EXTRA_PAGES).pages.first()
 
 	val isChanged: Boolean
 		get() = colorFilter.value != initialColorFilter
 
 	init {
-		val page = savedStateHandle.require<ParcelableMangaPages>(ColorFilterConfigActivity.EXTRA_PAGES).pages.first()
 		launchLoadingJob {
 			initialColorFilter = mangaDataRepository.getColorFilter(manga.id)
 			colorFilter.value = initialColorFilter
 		}
-		launchLoadingJob(Dispatchers.Default) {
-			val repository = mangaRepositoryFactory.create(page.source)
-			val url = repository.getPageUrl(page)
-			preview.value = MangaPage(
-				id = page.id,
-				url = url,
-				preview = page.preview,
-				source = page.source,
-			)
-		}
 	}
 
 	fun setBrightness(brightness: Float) {