// Copy tile to output
private void CopyToOutput(TileRenderState state, Tensor <float> tensor, Rectangle tile)
{
if (tile.Y > 0)
{
BlendTopMargin(state, tensor, tile);
}
var sx = tile.X > 0 ? Margin : 0;
var sy = tile.Y > 0 ? Margin : 0;
var(x, y) = (tile.X, tile.Y);
var cols = Math.Min(tensor.Width() - sx, Output.Width - tile.X);
var rows = Math.Min(tensor.Height() - sy, Output.Height - tile.Y);
var tensorRow = new ArraySegment <byte>(state.TensorRow, 0, cols * 4);
var marginLeft = new ArraySegment <byte>(state.OutputRow, 0, sx * 4);
for (int row = sy; row < rows; ++row)
{
_ = tensor.GetRowArgb(tensorRow, sx, row + sy);
Output.GetRowArgb(marginLeft, tile.X, row + y);
marginLeft.LinearBlend(tensorRow, tensorRow);
Output.SetRowArgb(tensorRow, x, row + y);
}
}
/// <summary>
/// Process an effect graph using tiled input
/// </summary>
/// <param name="graph">Fully configured effect graph instance</param>
public void Process(EffectGraph graph)
{
Contract.Requires(graph != null);
var state = new TileRenderState(this);
var tiles = GetTiles(new Size(Input.Width, Input.Height), TileSize);
int index = 0;
graph.Update += GraphUpdate;
foreach (var tile in tiles)
{
++index;
var expanded = AddMargins(tile);
state.SetTileSize(expanded.Size);
graph.Params.Content = Input.CopyToTensor(state.Tensor, expanded);
var result = graph.Run(index == 1);
CopyToOutput(state, result, tile);
}
graph.Update -= GraphUpdate;
void GraphUpdate(object sender, EffectGraphEventArgs e)
{
var args = new TileEventArgs(e, tiles[index - 1], index, tiles.Count);
Update?.Invoke(this, args);
}
}
// Blend a tile's top rows with previous output
private void BlendTopMargin(TileRenderState state, Tensor <float> tensor, Rectangle tile)
{
var(ix, iy) = (tile.X > 0 ? Margin : 0, Margin);
var(ox, oy) = (tile.X, tile.Y);
var delta = 1.0f / Margin;
var c = delta;
var elements = (tensor.Width() - ix) * 4;
var tensorRow = new ArraySegment <byte>(state.TensorRow, 0, elements);
var outputRow = new ArraySegment <byte>(state.OutputRow, 0, elements);
var resultRow = new ArraySegment <byte>(state.BufferRow, 0, elements);
for (int i = 0; i < Margin; ++i, ++iy, ++oy, c += delta)
{
_ = tensor.GetRowArgb(tensorRow, ix, iy);
_ = Output.GetRowArgb(outputRow, ox, oy);
outputRow.MixArgb(tensorRow, resultRow, c);
Output.SetRowArgb(resultRow, ox, oy);
}
}