build method

Implementation

Future<BitmapDescriptor> build() async {
  String svgString;
  final mediaQueryData = MediaQuery.of(_context);
  if (_assetName != null) {
    svgString = await DefaultAssetBundle.of(_context).loadString(_assetName!);
  } else if (_svgString != null) {
    svgString = _svgString!;
  } else {
    svgString = _dummySvg;
  }
  if (_interpolateParams != null) {
    svgString = svgString.interpolate(_interpolateParams!);
  }
  //DrawableRoot drawableRoot = await svg.fromSvgString(svgString, "");

  final pictureInfo = await vg.loadPicture(SvgStringLoader(svgString), null);

  // double width = drawableRoot.viewport.width;
  // double height = drawableRoot.viewport.height;

  double width = pictureInfo.size.width;
  double height = pictureInfo.size.height;

  if (_originalSizeAsLp) {
    double ratio = mediaQueryData.devicePixelRatio;
    width = width * ratio;
    height = height * ratio;
  }
  if (_originalSizeAsSp) {
    double ratio = mediaQueryData.devicePixelRatio * mediaQueryData.textScaleFactor;
    width = width * ratio;
    height = height * ratio;
  } else if (_targetLpWidth > 0) {
    double pxWidth = _targetLpWidth * mediaQueryData.devicePixelRatio;
    if (pxWidth.round() != width.round()) {
      height = height * pxWidth / width;
      width = pxWidth.toDouble();
    }
  } else if (_targetSpWidth > 0) {
    double pxWidth = _targetSpWidth * mediaQueryData.devicePixelRatio * mediaQueryData.textScaleFactor;
    if (pxWidth.round() != width.round()) {
      height = height * pxWidth / width;
      width = pxWidth.toDouble();
    }
  } else if (_targetPxWidth > 0) {
    if (_targetPxWidth != width.round()) {
      height = height * _targetPxWidth / width;
      width = _targetPxWidth.toDouble();
    }
  }
  BitmapDescriptor? bitmapDescriptor;
  bool hit = false;
  if (_useCache) {
    bitmapDescriptor = bitmapDescriptorCache.get(svgString, width.round(), height.round());
    if (bitmapDescriptor == null) {
      hit = false;
      //ui.Picture picture = drawableRoot.toPicture(size: Size(width, height));
      ui.Image image = await pictureInfo.picture.toImage(width.round(), height.round());
      ByteData? bytes = await image.toByteData(format: ui.ImageByteFormat.png);
      bitmapDescriptor = BitmapDescriptor.fromBytes(bytes!.buffer.asUint8List());
      bitmapDescriptorCache.set(svgString, width.round(), height.round(), bitmapDescriptor);
    } else {
      hit = true;
    }
  } else {
    // ui.Picture picture = drawableRoot.toPicture(size: Size(width, height));
    ui.Image image = await pictureInfo.picture.toImage(width.round(), height.round());
    ByteData? bytes = await image.toByteData(format: ui.ImageByteFormat.png);
    bitmapDescriptor = BitmapDescriptor.fromBytes(bytes!.buffer.asUint8List());
  }
  if (_debugLog) {
    debugUtil.log("BitmapDescriptorFromSvgAssetBuilder");
    debugUtil.log("devicePixelRatio ${mediaQueryData.devicePixelRatio}");
    debugUtil.log("assetName $_assetName");
    debugUtil.log("svgString $svgString");
    debugUtil.log("interpolateParams $_interpolateParams");
    debugUtil.log("originalSizeAsLp $_originalSizeAsLp");
    debugUtil.log("targetLpWidth $_targetLpWidth");
    debugUtil.log("targetPxWidth $_targetPxWidth");
    debugUtil.log("output width ${width.round()}");
    debugUtil.log("output height ${height.round()}");
    debugUtil.log("_useCache $_useCache hit $hit");
  }
  pictureInfo.picture.dispose();
  return bitmapDescriptor;
}