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