/// <summary>
/// Initialize a <see cref="DeepZoomGenerator"/> instance with the specified parameters.
/// </summary>
/// <param name="image">The OpenSlide image.</param>
/// <param name="tileSize">The tile size paramter.</param>
/// <param name="overlap">The overlap paramter.</param>
/// <param name="limitBounds">Whether image bounds should be respected.</param>
/// <param name="disposeImage">Whether the OpenSlide image instance should be disposed when this <see cref="DeepZoomGenerator"/> instance is disposed.</param>
public DeepZoomGenerator(OpenSlideImage image, int tileSize = 254, int overlap = 1, bool limitBounds = true, bool disposeImage = false)
{
_image = image ?? throw new ArgumentNullException(nameof(image));
_disposeImage = disposeImage;
long width, height;
if (limitBounds)
{
_boundX = image.BoundsX ?? 0;
_boundY = image.BoundsY ?? 0;
_width = width = image.BoundsWidth ?? image.Width;
_height = height = image.BoundsHeight ?? image.Height;
}
else
{
_boundX = 0;
_boundY = 0;
_width = width = image.Width;
_height = height = image.Height;
}
DeepZoomLayer[] dzLayers = DeepZoomHelper.CalculateDeepZoomLayers(width, height);
DeepZoomLayerInformation[] layers = new DeepZoomLayerInformation[dzLayers.Length];
for (int i = 0; i < layers.Length; i++)
{
DeepZoomLayer dzLayer = dzLayers[i];
int layerDownsample = 1 << (dzLayers.Length - i - 1);
int level = image.GetBestLevelForDownsample(layerDownsample);
(long levelWidth, long levelHeight) = image.GetLevelDimensions(level);
layers[i] = new DeepZoomLayerInformation
{
Level = level,
LevelDownsample = image.GetLevelDownsample(level),
LevelWidth = levelWidth,
LevelHeight = levelHeight,
LayerDownsample = layerDownsample,
LayerWidth = dzLayer.Width,
LayerHeight = dzLayer.Height
};
}
_layers = layers;
_tileSize = tileSize;
_overlap = overlap;
}
internal static DeepZoomLayer[] CalculateDeepZoomLayers(long width, long height)
{
if (width <= 0)
{
throw new ArgumentOutOfRangeException(nameof(width));
}
if (height <= 0)
{
throw new ArgumentOutOfRangeException(nameof(height));
}
var layers = new List <DeepZoomLayer>();
DeepZoomLayer currentLayer = new DeepZoomLayer(width, height);
layers.Add(currentLayer);
while (currentLayer.Width != 1 || currentLayer.Height != 1)
{
currentLayer = new DeepZoomLayer((currentLayer.Width + 1) / 2, (currentLayer.Height + 1) / 2);
layers.Add(currentLayer);
}
DeepZoomLayer[] layersArray = layers.ToArray();
Array.Reverse(layersArray);
return(layersArray);
}
