public TileRenderState(TiledRenderer renderer)
{
var n = renderer.TileSize + renderer.Margin;
SetTileSize(new Size(n, n));
var k = (n + 2 * renderer.Margin) * 4;
TensorRow = new byte[k];
OutputRow = new byte[k];
BufferRow = new byte[k];
}
/// <summary>
/// Return the recommended tile size based on the available RAM
/// </summary>
/// <param name="size">Size of the input in pixels</param>
/// <param name="margin">Tile margin in percent [0, 1.0]</param>
/// <returns>Maximum tile size that can be processed safely</returns>
public static Size GetRecommendedTileSize(Size size, float margin)
{
// the .NET heap *will* allocate much more than 33% of the available RAM
// though the algorithm performs better with less (i.e. bigger) tiles in
// terms of output quality, this will come at the expense of much longer
// calculation time
const int THRESHOLD_PERCENT = 33;
var threshold = (AvailableMemory * THRESHOLD_PERCENT) / 100;
var required = GetEstimatedRequiredMemory(size);
if (required > threshold)
{
var factor = new RangedValue <float>(margin, 0.0f, 1.0f).Value;
var pixels = GetMaximumPixelCount(threshold);
var tileSize = (int)Math.Floor(Math.Sqrt(pixels));
var n = (int)(tileSize / (1.0f + factor));
if (TiledRenderer.GetTiles(size, n).Count > 1)
{
return(new Size(n, n));
}
}
return(size);
}
