paint method

void paint(Canvas canvas, Rect rect, Path? clipPath, ImageConfiguration configuration,)

Forked from flutter with parameter customization of _paintImage method: https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/painting/decoration_image.dart#L231

Implementation

void paint(Canvas canvas, Rect rect, Path? clipPath, ImageConfiguration configuration) {
  bool flipHorizontally = false;
  if (_details.matchTextDirection) {
    assert(() {
      // We check this first so that the assert will fire immediately, not just
      // when the image is ready.
      if (configuration.textDirection == null) {
        throw FlutterError.fromParts(<DiagnosticsNode>[
          ErrorSummary('DecorationImage.matchTextDirection can only be used when a TextDirection is available.'),
          ErrorDescription(
            'When BoxDecorationImagePainter.paint() was called, there was no text direction provided '
              'in the ImageConfiguration object to match.',
          ),
          DiagnosticsProperty<DecorationImage>('The DecorationImage was', _details, style: DiagnosticsTreeStyle.errorProperty),
          DiagnosticsProperty<ImageConfiguration>('The ImageConfiguration was', configuration, style: DiagnosticsTreeStyle.errorProperty),
        ]);
      }
      return true;
    }());
    if (configuration.textDirection == TextDirection.rtl)
      flipHorizontally = true;
  }

  final ImageStream newImageStream = _details.image.resolve(configuration);
  if (newImageStream.key != _imageStream?.key) {
    final ImageStreamListener listener = ImageStreamListener(
      _handleImage,
      onError: _details.onError,
    );
    _imageStream?.removeListener(listener);
    _imageStream = newImageStream;
    _imageStream!.addListener(listener);
  }
  if (_image == null)
    return;

  if (clipPath != null) {
    canvas.save();
    canvas.clipPath(clipPath);
  }
  _paintImage(
    canvas: canvas,
    rect: rect,
    image: _image!.image,
    debugImageLabel: _image!.debugLabel,
    scale: _details.scale * _image!.scale,
    colorFilter: _details.colorFilter,
    positionX: _backgroundPositionX,
    positionY: _backgroundPositionY,
    backgroundSize: _backgroundSize,
    centerSlice: _details.centerSlice,
    repeat: _details.repeat,
    flipHorizontally: flipHorizontally,
    filterQuality: FilterQuality.low,
  );

  if (clipPath != null)
    canvas.restore();
}