apply the filters on thumbnail items

app/src/main/kotlin/com/simplemobiletools/gallery/activities/EditActivity.kt

@@ -23,6 +23,7 @@ import com.simplemobiletools.gallery.dialogs.ResizeDialog
 import com.simplemobiletools.gallery.dialogs.SaveAsDialog
 import com.simplemobiletools.gallery.extensions.config
 import com.simplemobiletools.gallery.extensions.openEditor
+import com.simplemobiletools.gallery.helpers.FilterThumbnailsManager
 import com.simplemobiletools.gallery.models.FilterItem
 import com.theartofdev.edmodo.cropper.CropImageView
 import com.zomato.photofilters.FilterPack
@@ -253,8 +254,14 @@ class EditActivity : SimpleActivity(), CropImageView.OnCropImageCompleteListener
                 val size = resources.getDimension(R.dimen.bottom_filters_thumbnail_height).toInt()
                 val bitmap = Glide.with(this).asBitmap().load(uri).submit(size, size).get()
                 runOnUiThread {
-                    val filterItems = FilterPack.getFilterPack(this).map { FilterItem(bitmap, it) } as ArrayList<FilterItem>
+                    FilterThumbnailsManager.clearThumbs()
 
+                    FilterPack.getFilterPack(this).forEach {
+                        val filterItem = FilterItem(bitmap, it)
+                        FilterThumbnailsManager.addThumb(filterItem)
+                    }
+
+                    val filterItems = FilterThumbnailsManager.processThumbs()
                     val adapter = FiltersAdapter(filterItems) {
 
                     }

app/src/main/kotlin/com/simplemobiletools/gallery/helpers/FilterThumbnailsManager.kt

@@ -0,0 +1,26 @@
+package com.simplemobiletools.gallery.helpers
+
+import com.simplemobiletools.gallery.models.FilterItem
+import java.util.*
+
+object FilterThumbnailsManager {
+    private var filterThumbnails = ArrayList<FilterItem>(10)
+    private var processedThumbnails = ArrayList<FilterItem>(10)
+
+    fun addThumb(filterItem: FilterItem) {
+        filterThumbnails.add(filterItem)
+    }
+
+    fun processThumbs(): ArrayList<FilterItem> {
+        for (filterItem in filterThumbnails) {
+            filterItem.bitmap = filterItem.filter.processFilter(filterItem.bitmap)
+            processedThumbnails.add(filterItem)
+        }
+        return processedThumbnails
+    }
+
+    fun clearThumbs() {
+        filterThumbnails = ArrayList()
+        processedThumbnails = ArrayList()
+    }
+}

app/src/main/kotlin/com/simplemobiletools/gallery/models/FilterItem.kt

@@ -3,4 +3,4 @@ package com.simplemobiletools.gallery.models
 import android.graphics.Bitmap
 import com.zomato.photofilters.imageprocessors.Filter
 
-data class FilterItem(val bitmap: Bitmap, val filter: Filter)
+data class FilterItem(var bitmap: Bitmap, val filter: Filter)