mirror of
https://gitlab.com/comunic/comunicmobile
synced 2024-11-22 21:09:21 +00:00
53 lines
2.1 KiB
Dart
53 lines
2.1 KiB
Dart
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);
|
|
}
|