allow drawing a bitmap as the canvas background

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

@@ -1,10 +1,7 @@
 package com.simplemobiletools.draw
 
 import android.content.Context
-import android.graphics.Bitmap
+import android.graphics.*
-import android.graphics.Canvas
-import android.graphics.Color
-import android.graphics.Paint
 import android.os.Parcel
 import android.os.Parcelable
 import android.util.AttributeSet
@@ -26,6 +23,7 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
     private var mStartY = 0f
     private var mIsSaving = false
     private var mIsStrokeWidthBarEnabled = false
+    private var mDrawBitmapAsBackground: Bitmap? = null
 
     init {
         mPath = MyPath()
@@ -88,6 +86,11 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
         return bitmap
     }
 
+    fun drawBitmap(path: String) {
+        mDrawBitmapAsBackground = BitmapFactory.decodeFile(path)
+        invalidate()
+    }
+
     fun addPath(path: MyPath, options: PaintOptions) {
         mPaths.put(path, options)
         pathsUpdated()
@@ -96,6 +99,10 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
+        if (mDrawBitmapAsBackground != null) {
+            canvas.drawBitmap(mDrawBitmapAsBackground, 0f, 0f, null)
+        }
+
         for ((key, value) in mPaths) {
             changePaint(value)
             canvas.drawPath(key, mPaint)
@@ -182,8 +189,6 @@ class MyCanvas(context: Context, attrs: AttributeSet) : View(context, attrs) {
             }
             MotionEvent.ACTION_MOVE -> actionMove(x, y)
             MotionEvent.ACTION_UP -> actionUp()
-            else -> {
-            }
         }
 
         invalidate()

app/src/main/kotlin/com/simplemobiletools/draw/activities/MainActivity.kt

@@ -117,7 +117,7 @@ class MainActivity : SimpleActivity(), MyCanvas.PathsChangedListener {
         if (path.endsWith(".svg")) {
             Svg.loadSvg(this, File(path), my_canvas)
         } else if (File(path).isImageSlow()) {
-
+            my_canvas.drawBitmap(path)
         } else {
             toast(R.string.invalid_file_format)
         }