getPngFromSvg method

Future<File> getPngFromSvg({ String? path, String? fileName, double? width, double? height, bool overrideFile = false, })

Get a png File from the current avataaar and storage it on the provided paths.

Avataaar svg is requested, converted into a png file and storage as a temporary file. Png File will be return. if background color is set, it will be on the file.

Throw an Exception if it fails

Implementation

Future<File> getPngFromSvg({
  String? path,
  String? fileName,
  double? width,
  double? height,
  bool overrideFile = false,
}) async {
  try {
    // if just one is set, has a square
    if (width != null || height != null) {
      width ??= height;
      height ??= width;
    }

    var finalWidth = width ?? 256.0;
    var finalHeight = height ?? 256.0;

    //getting the svg from server
    var svgString = cachedUrls.containsKey(toUrl())
        ? cachedUrls[toUrl()]
        : await http.get(Uri.parse(toUrl())).then((it) {
            if (it.statusCode == 200) {
              cachedUrls.putIfAbsent(toUrl(), () => it.body);
              return it.body;
            } else {
              return null;
            }
          });

    if (svgString == null) {
      throw Exception('Error transforming svg to a png -> $e');
    }

    if (backgroundColor != AvataaarsApi.baseBackgroundColor) {
      svgString = BackgroundColorHelper.getSvgWithBackground(svgString, backgroundColor);
    }

    var unit8Picture = Uint8List.fromList(svgString.codeUnits);
    //Produces a [Drawableroot] from a [Uint8List] of SVG byte data (assumes UTF8 encoding).
    var svgDrawableRoot = await svg.fromSvgBytes(unit8Picture, 'svgToPngAvataaar');

    // Convert to ui.Picture
    var picture = svgDrawableRoot.toPicture(size: Size(finalWidth, finalHeight));
    // 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
    var image = await picture.toImage(finalWidth.toInt(), finalHeight.toInt());
    var bytes = await image.toByteData(format: ImageByteFormat.png);

    //Saving as a temporary file using a unique string

    var file = File('${path ?? (await getTemporaryDirectory()).path}/${fileName ?? Uuid().v4()}.png');
    if (await file.exists()) {
      if (overrideFile) {
        await file.delete();
      } else {
        throw Exception('File exists');
      }
    }

    await file.writeAsBytes(
      bytes!.buffer.asUint8List(
        bytes.offsetInBytes,
        bytes.lengthInBytes,
      ),
    );
    return file;
  } on Exception catch (e) {
    throw Exception('Error transforming svg to a png -> $e');
  }
}