lets use Glide for Subsampling image decoding, keep Picasso only at regions

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/PhotoFragment.kt

@@ -464,7 +464,7 @@ class PhotoFragment : ViewPagerFragment() {
         val minTileDpi = if (showHighestQuality) -1 else getMinTileDpi()
 
         val bitmapDecoder = object : DecoderFactory<ImageDecoder> {
-            override fun make() = PicassoDecoder(mMedium.path, Picasso.get(), rotation)
+            override fun make() = MyGlideImageDecoder(rotation, mScreenWidth, mScreenHeight)
         }
 
         val regionDecoder = object : DecoderFactory<ImageRegionDecoder> {

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/MyGlideImageDecoder.kt

@@ -0,0 +1,29 @@
+package com.simplemobiletools.gallery.pro.helpers
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.net.Uri
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DecodeFormat
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestOptions
+import com.davemorrissey.labs.subscaleview.ImageDecoder
+
+class MyGlideImageDecoder(val degrees: Int, val width: Int, val height: Int) : ImageDecoder {
+
+    override fun decode(context: Context, uri: Uri): Bitmap {
+        val options = RequestOptions()
+                .format(DecodeFormat.PREFER_ARGB_8888)
+                .diskCacheStrategy(DiskCacheStrategy.NONE)
+                .fitCenter()
+
+        val builder = Glide.with(context)
+                .asBitmap()
+                .load(uri)
+                .apply(options)
+                .transform(RotateTransformation(-degrees))
+                .into(width, height)
+
+        return builder.get()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/PicassoDecoder.kt

@@ -1,21 +0,0 @@
-package com.simplemobiletools.gallery.pro.helpers
-
-import android.content.Context
-import android.graphics.Bitmap
-import android.net.Uri
-import com.davemorrissey.labs.subscaleview.ImageDecoder
-import com.squareup.picasso.MemoryPolicy
-import com.squareup.picasso.Picasso
-
-class PicassoDecoder(val tag: String, val picasso: Picasso, val degrees: Int) : ImageDecoder {
-
-    override fun decode(context: Context, uri: Uri): Bitmap {
-        return picasso
-                .load(uri)
-                .tag(tag)
-                .config(Bitmap.Config.ARGB_8888)
-                .memoryPolicy(MemoryPolicy.NO_CACHE)
-                .rotate(-degrees.toFloat())
-                .get()
-    }
-}

app/src/main/kotlin/com/simplemobiletools/gallery/pro/helpers/RotateTransformation.kt

@@ -0,0 +1,17 @@
+package com.simplemobiletools.gallery.pro.helpers
+
+import android.graphics.Bitmap
+import android.graphics.Matrix
+import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool
+import com.bumptech.glide.load.resource.bitmap.BitmapTransformation
+import java.security.MessageDigest
+
+class RotateTransformation(var degrees: Int) : BitmapTransformation() {
+    override fun updateDiskCacheKey(messageDigest: MessageDigest) {}
+
+    override fun transform(pool: BitmapPool, toTransform: Bitmap, outWidth: Int, outHeight: Int): Bitmap {
+        val matrix = Matrix()
+        matrix.postRotate(degrees.toFloat())
+        return Bitmap.createBitmap(toTransform, 0, 0, toTransform.width, toTransform.height, matrix, true)
+    }
+}