enableBackgroundFromAsset method

@override Future<void> enableBackgroundFromAsset(String assetPath)

Enables a renderer-managed background from an asset.

Implementation

@override
Future<void> enableBackgroundFromAsset(String assetPath) async {
  final byteData = await services.rootBundle.load(assetPath);
  final codec = await ui.instantiateImageCodec(
    byteData.buffer.asUint8List(
      byteData.offsetInBytes,
      byteData.lengthInBytes,
    ),
  );
  try {
    final frame = await codec.getNextFrame();
    final image = frame.image;
    try {
      final rgba = await image.toByteData();
      if (rgba == null) {
        throw StateError(
          'Failed to convert background image to raw RGBA bytes.',
        );
      }

      final width = image.width;
      final height = image.height;
      if (_backgroundTexture == null ||
          _backgroundTexture!.width != width ||
          _backgroundTexture!.height != height) {
        _backgroundTexture = gpu.gpuContext.createTexture(
          gpu.StorageMode.hostVisible,
          width,
          height,
          enableRenderTargetUsage: false,
        );
      }
      _backgroundTexture!.overwrite(rgba);
    } finally {
      image.dispose();
    }
  } finally {
    codec.dispose();
  }

  _onNeedsRender?.call();
}