From 8c57ff36b442aa36a846252204c3226b9b2d121c Mon Sep 17 00:00:00 2001
From: Damontecres <damontecres@gmail.com>
Date: Fri, 15 May 2026 16:59:08 -0400
Subject: [PATCH] Prefetch images for slideshow

---
 app/src/main/AndroidManifest.xml              |  3 ++-
 .../components/image/ImageDetailsViewModel.kt | 20 +++++++++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1d046db96..f2f9857b4 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -29,7 +29,8 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/Theme.StashAppAndroidTV"
-        android:usesCleartextTraffic="true">
+        android:usesCleartextTraffic="true"
+        android:largeHeap="true">
         <activity
             android:name=".RootActivity"
             android:banner="@mipmap/ic_banner"
diff --git a/app/src/main/java/com/github/damontecres/stashapp/ui/components/image/ImageDetailsViewModel.kt b/app/src/main/java/com/github/damontecres/stashapp/ui/components/image/ImageDetailsViewModel.kt
index 4a9fa4068..2b8fe834b 100644
--- a/app/src/main/java/com/github/damontecres/stashapp/ui/components/image/ImageDetailsViewModel.kt
+++ b/app/src/main/java/com/github/damontecres/stashapp/ui/components/image/ImageDetailsViewModel.kt
@@ -8,6 +8,9 @@ import androidx.lifecycle.ViewModel
 import androidx.lifecycle.asFlow
 import androidx.lifecycle.asLiveData
 import androidx.lifecycle.viewModelScope
+import coil3.imageLoader
+import coil3.request.ImageRequest
+import coil3.size.Size
 import com.apollographql.apollo.api.Query
 import com.github.damontecres.stashapp.StashApplication
 import com.github.damontecres.stashapp.api.fragment.GalleryData
@@ -40,6 +43,7 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import timber.log.Timber
 import kotlin.properties.Delegates
 
 class ImageDetailsViewModel : ViewModel() {
@@ -240,6 +244,22 @@ class ImageDetailsViewModel : ViewModel() {
                     } else {
                         loadingState.value = ImageLoadingState.Error
                     }
+                    if (position + 1 in pager.indices) {
+                        try {
+                            pager.getBlocking(position + 1)?.let { nextImage ->
+                                Timber.v("Prefetching %s", nextImage.id)
+                                val request =
+                                    ImageRequest
+                                        .Builder(StashApplication.getApplication())
+                                        .data(nextImage.paths.image)
+                                        .size(Size.ORIGINAL)
+                                        .build()
+                                StashApplication.getApplication().imageLoader.enqueue(request)
+                            }
+                        } catch (ex: Exception) {
+                            Timber.e(ex, "Error prefetching image")
+                        }
+                    }
                 } catch (ex: Exception) {
                     loadingState.value = ImageLoadingState.Error
                     LoggingCoroutineExceptionHandler(