Replace identicon with jdenticon

lib/utils/identicon_utils.dart

@@ -0,0 +1,52 @@
+import 'dart:typed_data';
+import 'dart:ui';
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter_svg/flutter_svg.dart';
+import 'package:jdenticon_dart/jdenticon_dart.dart';
+import 'package:random_string/random_string.dart';
+
+/// Identicon utilities
+///
+/// @author Pierre Hubert
+
+
+// Based on https://stackoverflow.com/a/63215502/3781411
+Future<Uint8List> svgToPng(BuildContext context, String svgString,
+    {int svgWidth, int svgHeight}) async {
+  DrawableRoot svgDrawableRoot = await svg.fromSvgString(svgString, null);
+
+  // to have a nice rendering it is important to have the exact original height and width,
+  // the easier way to retrieve it is directly from the svg string
+  // but be careful, this is an ugly fix for a flutter_svg problem that works
+  // with my images
+  String temp = svgString.substring(svgString.indexOf('height="') + 8);
+  int originalHeight =
+      svgHeight ?? int.parse(temp.substring(0, temp.indexOf('p')));
+  temp = svgString.substring(svgString.indexOf('width="') + 7);
+  int originalWidth =
+      svgWidth ?? int.parse(temp.substring(0, temp.indexOf('p')));
+
+  // toPicture() and toImage() don't seem to be pixel ratio aware, so we calculate the actual sizes here
+  double devicePixelRatio = MediaQuery.of(context).devicePixelRatio;
+
+  double width = originalHeight *
+      devicePixelRatio; // where 32 is your SVG's original width
+  double height = originalWidth * devicePixelRatio; // same thing
+
+  // Convert to ui.Picture
+  final picture = svgDrawableRoot.toPicture(size: Size(width, height));
+
+  // Convert to ui.Image. toImage() takes width and height as parameters
+  // you need to find the best size to suit your needs and take into account the screen DPI
+  final image = await picture.toImage(width.toInt(), height.toInt());
+  ByteData bytes = await image.toByteData(format: ImageByteFormat.png);
+
+  return bytes.buffer.asUint8List();
+}
+
+Future<Uint8List> genIdenticon(BuildContext context, {int size: 100}) async {
+  final identicon = Jdenticon.toSvg(randomString(25), size: size);
+
+  return svgToPng(context, identicon, svgHeight: size, svgWidth: size);
+}