From fbd228b768d1516beba98d04c4e2f95f3bf1430a Mon Sep 17 00:00:00 2001
From: Kyle Bolen <kbolen@amazon.com>
Date: Thu, 30 Jul 2026 03:30:47 +0000
Subject: [PATCH] Add decode failure logging to DenseThumb to diagnose sparse
 thumbnails

---
 .../kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt b/src/main/kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt
index 52b70b3..413061d 100644
--- a/src/main/kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt
+++ b/src/main/kotlin/com/bolenpad/photophetch/ui/DensePhotoGrid.kt
@@ -31,6 +31,8 @@ import java.time.LocalDate
 import java.time.ZoneId
 import java.time.format.DateTimeFormatter
 
+private val thumbLog = org.slf4j.LoggerFactory.getLogger("DenseThumb")
+
 /**
  * Dense grid: folder headers + flat photo grid per folder.
  * Each photo that is the first of its day gets a small date label
@@ -182,9 +184,11 @@ private fun DenseThumb(
                     pullFn = pullFn,
                 )
             }
-            if (bytes != null) {
+            if (bytes != null && bytes.isNotEmpty()) {
                 runCatching {
                     thumbnail = SkiaImage.makeFromEncoded(bytes).toComposeImageBitmap()
+                }.onFailure { e ->
+                    thumbLog.warn("Decode failed for ${photo.filename} (${bytes.size} bytes): ${e.message}")
                 }
             }
         }