From 881da038251566b2dbbedcc19c18e3dc6a2ce2ab Mon Sep 17 00:00:00 2001
From: Unknown <marty.oehme@gmail.com>
Date: Wed, 14 Feb 2018 15:54:28 +0100
Subject: [PATCH] Add Helper Functions

create PixelArray from another PixelArray
create empty PixelArray
convert PixelArray to ImageData
---
 lib/Dither.dart | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/lib/Dither.dart b/lib/Dither.dart
index 839fe79..ce0032c 100644
--- a/lib/Dither.dart
+++ b/lib/Dither.dart
@@ -32,6 +32,10 @@ class Pixel {
 class PixelArray {
   List<List<Pixel>> pixels;
 
+  PixelArray(int width, int height) {
+    pixels = new List.filled(height, new List(width));
+  }
+
   PixelArray.fromByteArray(Uint8ClampedList array, int imageWidth) {
     pixels = new List(array.length~/imageWidth~/4);
     int y = 0;
@@ -51,6 +55,10 @@ class PixelArray {
 
   PixelArray.fromImageData(ImageData imagedata, int imageWidth): this.fromByteArray(imagedata.data, imageWidth);
 
+  PixelArray.fromPixelArray(PixelArray pixelArray) {
+    pixels = new List<List<Pixel>>.from(pixelArray.pixels);
+  }
+
   Uint8ClampedList toByteArray() {
     //TODO: look for longest array, or each line separately. Only gets width from line 1 currently.
     Uint8ClampedList result = new Uint8ClampedList(getHeight()*getWidth()*4);
@@ -72,6 +80,10 @@ class PixelArray {
     return result;
   }
 
+  ImageData toImageData() {
+    return new ImageData(this.toByteArray(), this.getWidth(), this.getHeight());
+  }
+
   Pixel getPixel(int x, int y) {
     return pixels[y][x];
   }