Do color filling on background thread

app/src/main/kotlin/com/simplemobiletools/draw/pro/extensions/Bitmap.kt

@@ -3,7 +3,6 @@ package com.simplemobiletools.draw.pro.extensions
 import android.graphics.Bitmap
 import com.simplemobiletools.draw.pro.helpers.QueueLinearFloodFiller
 
-
 fun Bitmap.floodFill(color: Int, x: Int, y: Int, tolerance: Int = 10): Bitmap {
     val floodFiller = QueueLinearFloodFiller(this).apply {
         fillColor = color

app/src/main/kotlin/com/simplemobiletools/draw/pro/helpers/FloodFill.kt

@@ -4,11 +4,9 @@ import android.graphics.Bitmap
 import android.graphics.Color
 import java.util.*
 
-
 // Original algorithm by J. Dunlap http:// www.codeproject.com/KB/GDI-plus/queuelinearflood-fill.aspx
 // Java port by Owen Kaluza
 // Android port by Darrin Smith (Standard Android)
-
 class QueueLinearFloodFiller(img: Bitmap) {
 
     var image: Bitmap? = null

app/src/main/kotlin/com/simplemobiletools/draw/pro/models/CanvasOp.kt

@@ -3,7 +3,6 @@ package com.simplemobiletools.draw.pro.models
 import android.graphics.Bitmap
 import java.io.Serializable
 
-
 sealed class CanvasOp : Serializable {
     class PathOp(
         val path: MyPath,

app/src/main/kotlin/com/simplemobiletools/draw/pro/views/MyCanvas.kt

@@ -393,9 +393,12 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
         if (contains(touchedX, touchedY)) {
             val bitmap = getBitmap()
             val color = mPaintOptions.color
-            val img = bitmap.floodFill(color = color, x = touchedX, y = touchedY)
-            addOperation(CanvasOp.BitmapOp(img))
-            invalidate()
+
+            ensureBackgroundThread {
+                val img = bitmap.floodFill(color = color, x = touchedX, y = touchedY)
+                addOperation(CanvasOp.BitmapOp(img))
+                post { invalidate() }
+            }
         }
     }
 
@@ -408,7 +411,7 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
             mPath.lineTo(mCurX + 1, mCurY + 2)
             mPath.lineTo(mCurX + 1, mCurY)
         }
-        mOperations.add(CanvasOp.PathOp(mPath, mPaintOptions))
+        addOperation(CanvasOp.PathOp(mPath, mPaintOptions))
     }
 
     private fun addOperation(operation: CanvasOp) {