From f4d9ab0ff59614fbd3b54b345fdfcc489a67e737 Mon Sep 17 00:00:00 2001
From: tibbi <tibor@kaputa.sk>
Date: Tue, 5 Sep 2017 10:20:15 +0200
Subject: [PATCH] use the GlideDecoder at SubsamplingScaleImageView

---
 .../gallery/fragments/PhotoFragment.kt              |  2 ++
 .../gallery/helpers/GlideDecoder.kt                 | 13 +++++++++++++
 2 files changed, 15 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 dd0ccb737..2e8b5a2ce 100644
--- a/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/gallery/fragments/PhotoFragment.kt
@@ -33,6 +33,7 @@ import com.simplemobiletools.gallery.extensions.config
 import com.simplemobiletools.gallery.extensions.getFileSignature
 import com.simplemobiletools.gallery.extensions.getRealPathFromURI
 import com.simplemobiletools.gallery.extensions.portrait
+import com.simplemobiletools.gallery.helpers.GlideDecoder
 import com.simplemobiletools.gallery.helpers.GlideRotateTransformation
 import com.simplemobiletools.gallery.helpers.MEDIUM
 import com.simplemobiletools.gallery.models.Medium
@@ -199,6 +200,7 @@ class PhotoFragment : ViewPagerFragment() {
     private fun addZoomableView() {
         if ((medium.isImage()) && isFragmentVisible && view.subsampling_view.visibility == View.GONE) {
             view.subsampling_view.apply {
+                setBitmapDecoderClass(GlideDecoder::class.java)
                 maxScale = 10f
                 beVisible()
                 setImage(ImageSource.uri(medium.path))
diff --git a/app/src/main/kotlin/com/simplemobiletools/gallery/helpers/GlideDecoder.kt b/app/src/main/kotlin/com/simplemobiletools/gallery/helpers/GlideDecoder.kt
index 1e3796359..9cba5dbef 100644
--- a/app/src/main/kotlin/com/simplemobiletools/gallery/helpers/GlideDecoder.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/gallery/helpers/GlideDecoder.kt
@@ -5,6 +5,7 @@ import android.graphics.Bitmap
 import android.graphics.Canvas
 import android.graphics.drawable.BitmapDrawable
 import android.graphics.drawable.Drawable
+import android.media.ExifInterface
 import android.net.Uri
 import com.bumptech.glide.Glide
 import com.bumptech.glide.load.DecodeFormat
@@ -14,9 +15,13 @@ import com.davemorrissey.labs.subscaleview.decoder.ImageDecoder
 
 class GlideDecoder : ImageDecoder {
     override fun decode(context: Context, uri: Uri): Bitmap {
+        val exif = android.media.ExifInterface(uri.path)
+        val orientation = exif.getAttributeInt(android.media.ExifInterface.TAG_ORIENTATION, android.media.ExifInterface.ORIENTATION_NORMAL)
+
         val options = RequestOptions()
                 .format(DecodeFormat.PREFER_ARGB_8888)
                 .diskCacheStrategy(DiskCacheStrategy.NONE)
+                .transform(GlideRotateTransformation(context, getRotationDegrees(orientation)))
 
         val drawable = Glide.with(context)
                 .load(uri)
@@ -45,4 +50,12 @@ class GlideDecoder : ImageDecoder {
         drawable.draw(canvas)
         return bitmap
     }
+
+    // rotating backwards intentionally, as SubsamplingScaleImageView will rotate it properly at displaying
+    private fun getRotationDegrees(orientation: Int) = when (orientation) {
+        ExifInterface.ORIENTATION_ROTATE_270 -> 90f
+        ExifInterface.ORIENTATION_ROTATE_180 -> 180f
+        ExifInterface.ORIENTATION_ROTATE_90 -> 270f
+        else -> 0f
+    }
 }