From 2f0de10848e8498a11a3abfc8a7728a12b12e8a4 Mon Sep 17 00:00:00 2001
From: Unknown <marty.oehme@gmail.com>
Date: Wed, 14 Feb 2018 16:44:56 +0100
Subject: [PATCH] Add PixelArray clone function

---
 lib/Dither.dart | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/lib/Dither.dart b/lib/Dither.dart
index 940c068..8579376 100644
--- a/lib/Dither.dart
+++ b/lib/Dither.dart
@@ -48,10 +48,17 @@ class Pixel {
 }
 
 class PixelArray {
+  //TODO Implement iterable
   List<List<Pixel>> pixels;
 
   PixelArray(int width, int height) {
-    pixels = new List.filled(height, new List(width));
+    pixels = new List(height);
+    for (int y = 0; y < height; y++) {
+      pixels[y] = new List(width);
+      for (int x = 0; x < height; x++) {
+        pixels[y][x] = new Pixel(x, y, 0, 0, 0, 0);
+      }
+    }
   }
 
   PixelArray.fromByteArray(Uint8ClampedList array, int imageWidth) {
@@ -107,12 +114,12 @@ class PixelArray {
   }
 
   void setPixel(Pixel pixel, [int x, int y]) {
-    if (x != null && y != null && pixels[y] != null && pixels[y].length >= x) {
+    if (x != null && y != null && getHeight() < y && getWidth() < x) {
       pixel.x = x;
       pixel.y = y;
       pixels[y][x] = pixel;
       return;
-    } else if (pixels.length < pixel.y || pixels[y].length < pixel.x) {
+    } else if (getHeight() <= pixel.y || getWidth() <= pixel.x) {
       return;
     } else {
       pixels[pixel.y][pixel.x] = pixel;
@@ -121,10 +128,23 @@ class PixelArray {
   }
 
   int getWidth() {
+    //TODO find longest/shortest width not at 0 (support for non square img)
     return pixels[0].length;
   }
 
   int getHeight() {
     return pixels.length;
   }
+
+  PixelArray clone() {
+    PixelArray pxArr = new PixelArray(getWidth(), getHeight());
+    for (var y = 0; y < getHeight(); y++) {
+      for (var x = 0; x < getWidth(); x++) {
+        Pixel px = getPixel(x, y);
+        Pixel newPix = new Pixel(x, y, px.r, px.g, px.b, px.a);
+        pxArr.setPixel( newPix, x, y );
+      }
+    }
+    return pxArr;
+  }
 }
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