Support images in manga description

app/src/main/java/org/koitharu/kotatsu/core/ui/uiModule.kt

@@ -1,5 +1,6 @@
 package org.koitharu.kotatsu.core.ui
 
+import android.text.Html
 import coil.ComponentRegistry
 import coil.ImageLoader
 import coil.disk.DiskCache
@@ -10,6 +11,7 @@ import org.koin.dsl.module
 import org.koitharu.kotatsu.core.parser.FaviconMapper
 import org.koitharu.kotatsu.local.data.CacheDir
 import org.koitharu.kotatsu.local.data.CbzFetcher
+import org.koitharu.kotatsu.utils.image.CoilImageGetter
 
 val uiModule
 	get() = module {
@@ -40,4 +42,5 @@ val uiModule
 						.build()
 				).build()
 		}
+		factory<Html.ImageGetter> { CoilImageGetter(androidContext(), get()) }
 	}

app/src/main/java/org/koitharu/kotatsu/details/DetailsModule.kt

@@ -8,6 +8,6 @@ val detailsModule
 	get() = module {
 
 		viewModel { intent ->
-			DetailsViewModel(intent.get(), get(), get(), get(), get(), get(), get(), get(), get())
+			DetailsViewModel(intent.get(), get(), get(), get(), get(), get(), get(), get(), get(), get())
 		}
 	}

app/src/main/java/org/koitharu/kotatsu/details/ui/DetailsFragment.kt

@@ -21,6 +21,7 @@ import coil.size.Scale
 import coil.util.CoilUtils
 import com.google.android.material.chip.Chip
 import kotlinx.coroutines.launch
+import org.koin.android.ext.android.get
 import org.koin.android.ext.android.inject
 import org.koin.androidx.viewmodel.ext.android.sharedViewModel
 import org.koitharu.kotatsu.R
@@ -80,6 +81,7 @@ class DetailsFragment :
 		viewModel.readingHistory.observe(viewLifecycleOwner, ::onHistoryChanged)
 		viewModel.bookmarks.observe(viewLifecycleOwner, ::onBookmarksChanged)
 		viewModel.scrobblingInfo.observe(viewLifecycleOwner, ::onScrobblingInfoChanged)
+		viewModel.description.observe(viewLifecycleOwner, ::onDescriptionChanged)
 		addMenuProvider(DetailsMenuProvider())
 	}
 
@@ -108,8 +110,6 @@ class DetailsFragment :
 			textViewTitle.text = manga.title
 			textViewSubtitle.textAndVisible = manga.altTitle
 			textViewAuthor.textAndVisible = manga.author
-			textViewDescription.text = manga.description?.parseAsHtml()?.takeUnless(Spanned::isBlank)
-				?: getString(R.string.no_description)
 			when (manga.state) {
 				MangaState.FINISHED -> {
 					textViewState.apply {
@@ -172,6 +172,14 @@ class DetailsFragment :
 		}
 	}
 
+	private fun onDescriptionChanged(description: CharSequence?) {
+		if (description.isNullOrBlank()) {
+			binding.textViewDescription.setText(R.string.no_description)
+		} else {
+			binding.textViewDescription.text = description
+		}
+	}
+
 	private fun onHistoryChanged(history: MangaHistory?) {
 		with(binding.buttonRead) {
 			if (history == null) {

app/src/main/java/org/koitharu/kotatsu/details/ui/DetailsViewModel.kt

@@ -1,5 +1,7 @@
 package org.koitharu.kotatsu.details.ui
 
+import android.text.Html
+import androidx.core.text.parseAsHtml
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.asFlow
 import androidx.lifecycle.asLiveData
@@ -43,6 +45,7 @@ class DetailsViewModel(
 	private val bookmarksRepository: BookmarksRepository,
 	private val settings: AppSettings,
 	private val scrobbler: Scrobbler,
+	private val imageGetter: Html.ImageGetter,
 ) : BaseViewModel() {
 
 	private val delegate = MangaDetailsDelegate(
@@ -79,7 +82,19 @@ class DetailsViewModel(
 
 	val bookmarks = delegate.manga.flatMapLatest {
 		if (it != null) bookmarksRepository.observeBookmarks(it) else flowOf(emptyList())
-	}.asLiveDataDistinct(viewModelScope.coroutineContext + Dispatchers.Default)
+	}.asLiveDataDistinct(viewModelScope.coroutineContext + Dispatchers.Default, emptyList())
+
+	val description = delegate.manga
+		.distinctUntilChangedBy { it?.description.orEmpty() }
+		.transformLatest {
+			val description = it?.description
+			if (description.isNullOrEmpty()) {
+				emit(null)
+			} else {
+				emit(description.parseAsHtml())
+				emit(description.parseAsHtml(imageGetter = imageGetter))
+			}
+		}.asLiveDataDistinct(viewModelScope.coroutineContext + Dispatchers.Default, null)
 
 	val onMangaRemoved = SingleLiveEvent<Manga>()
 	val isScrobblingAvailable: Boolean

app/src/main/java/org/koitharu/kotatsu/utils/image/CoilImageGetter.kt

@@ -0,0 +1,25 @@
+package org.koitharu.kotatsu.utils.image
+
+import android.content.Context
+import android.graphics.drawable.Drawable
+import android.text.Html
+import coil.ImageLoader
+import coil.executeBlocking
+import coil.request.ImageRequest
+
+class CoilImageGetter(
+	private val context: Context,
+	private val coil: ImageLoader,
+) : Html.ImageGetter {
+
+	override fun getDrawable(source: String?): Drawable? {
+		return coil.executeBlocking(
+			ImageRequest.Builder(context)
+				.data(source)
+				.allowHardware(false)
+				.build()
+		).drawable?.apply {
+			setBounds(0, 0, intrinsicHeight, intrinsicHeight)
+		}
+	}
+}