Image.file constructor

Image.file(String path, { StbiChannel desiredChannel = StbiChannel.default_, StbiDType dtype = StbiDType.u8, })

Implementation

factory Image.file(
  String path, {
  StbiChannel desiredChannel = StbiChannel.default_,
  StbiDType dtype = StbiDType.u8,
}) {
  final pPath = path.toNativeUtf8().cast<ffi.Char>();
  final pW = calloc<ffi.Int>();
  final pH = calloc<ffi.Int>();
  final pChannels = calloc<ffi.Int>();
  final ptr = switch (dtype) {
    StbiDType.u8 => c.stbi_load(pPath, pW, pH, pChannels, desiredChannel.value),
    StbiDType.u16 => c.stbi_load_16(pPath, pW, pH, pChannels, desiredChannel.value),
    StbiDType.f32 => c.stbi_loadf(pPath, pW, pH, pChannels, desiredChannel.value),
  };
  if (ptr == ffi.nullptr) {
    final pMsg = c.stbi_failure_reason();
    throw MNNException("Failed to load image: $path, ${pMsg.cast<Utf8>().toDartString()}");
  }
  final width = pW.value;
  final height = pH.value;
  final channels = pChannels.value;
  calloc.free(pPath);
  calloc.free(pW);
  calloc.free(pH);
  calloc.free(pChannels);

  return Image.fromPointer(
    ptr,
    width: width,
    height: height,
    channels: channels,
    desiredChannels: desiredChannel,
    dtype: dtype,
  );
}