renderSvgToPng function

Future<Uint8List> renderSvgToPng(BytesLoader loader, { int? width, int? height, })

Renders a vector graphic loaded by loader directly to PNG bytes.

This hides the ui.Canvas/ui.Image steps (and therefore the need to import 'package:pure_ui/pure_ui.dart') for callers who only need a PNG.

If width or height are omitted, the intrinsic size reported by the decoded picture (PictureInfo.size) is used.

Implementation

Future<Uint8List> renderSvgToPng(
  BytesLoader loader, {
  int? width,
  int? height,
}) async {
  final PictureInfo pictureInfo = await vg.loadPicture(loader);
  try {
    final int targetWidth = width ?? pictureInfo.size.width.round();
    final int targetHeight = height ?? pictureInfo.size.height.round();
    final ui.Image image = await pictureInfo.picture.toImage(
      targetWidth,
      targetHeight,
    );
    try {
      final ByteData? byteData = await image.toByteData(
        format: ui.ImageByteFormat.png,
      );
      return byteData!.buffer.asUint8List();
    } finally {
      image.dispose();
    }
  } finally {
    pictureInfo.picture.dispose();
  }
}