String _toImage(int width, int height, _Callback <Image> callback)
{
// create image and send via callback
// only send string if an error occurs.
return(this.ToImage(width, height, callback));
// [DONE] native 'Scene_toImage';
}
String _toImage(int width, int height, _Callback <Image> callback)
{
// create image and send via callback
// only send string if an error occurs.
// native 'Scene_toImage';
return(string.Empty); // Tmp to resolve build
}
public static Future _futurize(Action <_Callback> callback)
{
// Question, why is this so complicated for running a new Task.
// Could be a Dart -> C# translation issue
var resolve = new _Callback(() => { });
return(new Future(() => { }));
}
public static Future <T> _futurize <T>(Action <_Callback <T> > callback)
{
// Question, why is this so complicated for running a new Task.
// Could be a Dart -> C# translation issue
var result = default(T);
var resolve = new _Callback <T>((t) => { result = t; });
return(new Future <T>(() => { return result; }));
}
public string ToImage(int width,
int height,
_Callback <SKImage> raw_image_callback)
{
if (raw_image_callback == null)
{
return("Image callback was invalid");
}
if (m_layerTree == null)
{
return("Scene did not contain a layer tree.");
}
if (width == 0 || height == 0)
{
return("Image dimensions for scene were invalid.");
}
// We can't create an image on this task runner because we don't have a
// graphics context. Even if we did, it would be slow anyway. Also, this
// thread owns the sole reference to the layer tree. So we flatten the layer
// tree into a picture and use that as the thread transport mechanism.
var picture = m_layerTree.Flatten(new SKRect(0, 0, width, height));
if (picture == null)
{
// Already in Dart scope.
return("Could not flatten scene into a layer tree.");
}
var image = SKImage.FromPicture(picture, new SKSizeI(width, height));
raw_image_callback(image);
return(string.Empty);
}
public static string InstantiateImageCodec(List <int> list, _Callback <SKCodec> callback, _ImageInfo imageInfo, double decodedCacheRatioCap)
{
return(null);
}
