From 036641c0c421be0a7791967eef94e1a2cdd7a509 Mon Sep 17 00:00:00 2001
From: tibbi <tibor@kaputa.sk>
Date: Wed, 5 Sep 2018 22:13:31 +0200
Subject: [PATCH] calculate minimal tile dpi at fullscreen view dynamically

---
 .../gallery/fragments/PhotoFragment.kt               | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt b/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt
index 71a3dff74..ce012e47e 100644
--- a/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt
@@ -354,7 +354,9 @@ class PhotoFragment : ViewPagerFragment() {
 
     private fun addZoomableView() {
         val rotation = degreesForRotation(imageOrientation)
+
         view.subsampling_view.apply {
+            setMinimumTileDpi(getMinTileDpi())
             background = ColorDrawable(Color.TRANSPARENT)
             setBitmapDecoderFactory { PicassoDecoder(medium.path, Picasso.get(), rotation) }
             setRegionDecoderFactory { PicassoRegionDecoder() }
@@ -396,6 +398,16 @@ class PhotoFragment : ViewPagerFragment() {
         }
     }
 
+    private fun getMinTileDpi(): Int {
+        val metrics = resources.displayMetrics
+        val averageDpi = (metrics.xdpi + metrics.ydpi) / 2
+        return when {
+            averageDpi > 400 -> 320
+            averageDpi > 300 -> 240
+            else -> 160
+        }
+    }
+
     private fun checkIfPanorama() {
         isPanorama = try {
             val inputStream = if (medium.path.startsWith("content:/")) context!!.contentResolver.openInputStream(Uri.parse(medium.path)) else File(medium.path).inputStream()