public void Render(LayerTree layer_tree)
{
if (layer_tree == null)
{
return;
}
SKSizeI frame_size = new SKSizeI((int)_physicalWidth,
(int)_physicalHeight);
if (frame_size.IsEmpty)
{
return;
}
layer_tree.set_frame_size(frame_size);
var picture = layer_tree.Flatten(new SKRect(0, 0, frame_size.Width, frame_size.Height));
_canvas.DrawPicture(picture);
}
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);
}