public static Bgra32ImageBuffer ReadImageBuffer(this OpenSlideImage image, int level, long x, long y, long w, long h)
{
var buffer = new Bgra32ImageBuffer(checked ((int)w), checked ((int)h));
image.ReadRegion(level, x, y, w, h, ref buffer.GetPinnableReference());
return(buffer);
}
public static void GetThumbnailAsJpegToStream(this OpenSlideImage image, int maxSize, Stream stream, int quality = 75)
{
using (var thumbnail = GenerateThumbnail(image, maxSize, maxSize))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(maxSize *maxSize * 4 * 2));
try
{
using (var ms = new MemoryStream(buffer))
{
thumbnail.SaveAsJpeg(ms, new JpegEncoder()
{
Quality = quality
});
ms.SetLength(ms.Position);
ms.Position = 0;
ms.CopyTo(stream);
}
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
public static void GetThumbnailAsJpegToStream(this OpenSlideImage image, int maxSize, MemoryStream stream, int quality = 75)
{
using var thumbnail = GenerateThumbnail(image, maxSize, maxSize);
thumbnail.SaveAsJpeg(stream, new JpegEncoder {
Quality = quality
});
}
public static void GetAssociatedImageAsJpegToStream(this OpenSlideImage image, string name, MemoryStream stream)
{
using (var img = WriteImage(image, name))
{
img.SaveAsJpeg(stream, new JpegEncoder());
}
}
public static async Task GetAssociatedImageAsJpegToStreamAsync(this OpenSlideImage image, string name, Stream stream, int quality = 75)
{
using (var img = WriteImage(image, name))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(img.Width *img.Height * 4 * 2));
try
{
using (var ms = new MemoryStream(buffer))
{
img.SaveAsJpeg(ms, new JpegEncoder()
{
Quality = quality
});
ms.SetLength(ms.Position);
ms.Position = 0;
await ms.CopyToAsync(stream).ConfigureAwait(false);
}
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
public static Bgra32ImageBuffer ReadAssociatedImageBuffer(this OpenSlideImage image, string name, long w, long h)
{
var buffer = new Bgra32ImageBuffer(checked ((int)w), checked ((int)h));
image.ReadAssociatedImage(name, ref buffer.GetPinnableReference());
return(buffer);
}
private static Bgra32ImageBuffer ReadImage(OpenSlideImage image, string name)
{
if (!image.TryGetAssociatedImageDimensions(name, out var dims))
{
throw new KeyNotFoundException();
}
return(image.ReadAssociatedImageBuffer(name, dims.Width, dims.Height));
}
public static void GetAssociatedImageAsJpegToStream(this OpenSlideImage image, string name, MemoryStream stream, int quality = 75)
{
using var buffer = ReadImage(image, name);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
buffer.GetImage().SaveAsJpeg(stream, new JpegEncoder {
Quality = quality
});
}
public static byte[] GetThumbnailAsJpeg(this OpenSlideImage image, int maxSize, int quality = 75)
{
using var thumbnail = GenerateThumbnail(image, maxSize, maxSize);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
thumbnail.SaveAsJpeg(ms, new JpegEncoder {
Quality = quality
});
return(ms.ToArray());
}
public static byte[] GetAssociatedImageAsJpeg(this OpenSlideImage image, string name, int quality = 75)
{
using var buffer = ReadImage(image, name);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
buffer.GetImage().SaveAsJpeg(ms, new JpegEncoder {
Quality = quality
});
return(ms.ToArray());
}
public static async Task GetAssociatedImageAsJpegToStreamAsync(this OpenSlideImage image, string name, Stream stream, int quality = 75, CancellationToken cancellationToken = default)
{
using var buffer = ReadImage(image, name);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
buffer.GetImage().SaveAsJpeg(ms, new JpegEncoder {
Quality = quality
});
ms.Seek(0, SeekOrigin.Begin);
await ms.CopyToAsync(stream, 4096, cancellationToken).ConfigureAwait(false);
}
public static void GetThumbnailAsJpegToStream(this OpenSlideImage image, int maxSize, Stream stream, int quality = 75)
{
using var thumbnail = GenerateThumbnail(image, maxSize, maxSize);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
thumbnail.SaveAsJpeg(ms, new JpegEncoder {
Quality = quality
});
ms.Seek(0, SeekOrigin.Begin);
ms.CopyTo(stream);
}
public static async Task GetThumbnailAsJpegToStreamAsync(this OpenSlideImage image, int maxSize, Stream stream, int quality = 75, CancellationToken cancellationToken = default)
{
using var thumbnail = GenerateThumbnail(image, maxSize, maxSize);
using var ms = PooledMemoryStreamManager.Shared.GetStream();
thumbnail.SaveAsJpeg(ms, new JpegEncoder {
Quality = quality
});
ms.Seek(0, SeekOrigin.Begin);
await ms.CopyToAsync(stream, 4096, cancellationToken).ConfigureAwait(false);
}
private static Image <Bgra32> WriteImage(OpenSlideImage image, string name)
{
if (!image.TryGetAssociatedImageDimensions(name, out var dims))
{
throw new KeyNotFoundException();
}
var dest = new Image <Bgra32>((int)dims.Width, (int)dims.Height);
image.ReadAssociatedImage(name, ref Unsafe.As <Bgra32, byte>(ref MemoryMarshal.GetReference(dest.GetPixelSpan())));
return(dest);
}
private static Image <Bgra32> WriteImage(OpenSlideImage image, string name)
{
if (!image.TryGetAssociatedImageDimensions(name, out var dims))
{
throw new KeyNotFoundException();
}
var dest = new Image <Bgra32>((int)dims.Width, (int)dims.Height);
var frame = dest.Frames.RootFrame;
image.DangerousReadAssociatedImage(name, ref Unsafe.As <Bgra32, byte>(ref frame.DangerousGetPinnableReferenceToPixelBuffer()));
return(dest);
}
private static Image <Bgra32> GenerateThumbnail(OpenSlideImage image, int maxWidth, int maxHeight)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
(long width, long height) = image.Dimensions;
// 决定合适的level
double downsampleWidth = width / (double)maxWidth;
double downsampleHeight = height / (double)maxHeight;
double downsample = Math.Max(downsampleWidth, downsampleHeight);
int level = image.GetBestLevelForDownsample(downsample);
(long levelWidth, long levelHeight) = image.GetLevelDimensions(level);
// 计算目标大小
int targetWidth, targetHeight;
if (downsampleWidth > downsampleHeight)
{
// width缩小较大，将maxWidth作为标准
targetWidth = maxWidth;
targetHeight = (int)(height / downsampleWidth);
}
else
{
// height缩小较大，将maxHeight作为标准
targetWidth = (int)(width / downsampleHeight);
targetHeight = maxHeight;
}
Image <Bgra32> output;
checked
{
output = new Image <Bgra32>((int)levelWidth, (int)levelHeight);
}
output.Mutate(ctx =>
{
ctx.Apply(img =>
{
var frame = img.Frames.RootFrame;
image.DangerousReadRegion(
level, 0, 0, levelWidth, levelHeight,
ref Unsafe.As <Bgra32, byte>(ref frame.DangerousGetPinnableReferenceToPixelBuffer()));
});
ctx.Resize(targetWidth, targetHeight);
});
return(output);
}
/// <summary>
/// Read the property with the specified <paramref name="name"/>. If the property does not exists, This function returns <paramref name="defaultValue"/>.
/// </summary>
/// <param name="image">The <see cref="OpenSlideImage"/> object.</param>
/// <param name="name">The property name.</param>
/// <param name="defaultValue">The value returned when the specified property does not exists.</param>
/// <returns>The value of the property or <paramref name="defaultValue"/>.</returns>
public static string?GetProperty(this OpenSlideImage image, string name, string?defaultValue)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
if (!image.TryGetProperty(name, out string?value))
{
return(defaultValue);
}
return(value);
}
/// <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;
}
public static void GetThumbnailAsJpegToStream(this OpenSlideImage image, int maxSize, MemoryStream stream)
{
using (var thumbnail = GenerateThumbnail(image, maxSize, maxSize))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(maxSize *maxSize * 4 * 2));
try
{
thumbnail.SaveAsJpeg(stream, new JpegEncoder());
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
/// <summary>
/// Read the property with the specified <paramref name="name"/> and parse it as a <see cref="int"/> value. If the property does not exists or can not be parsed as <see cref="int"/>, This function returns <paramref name="defaultValue"/>.
/// </summary>
/// <param name="image">The <see cref="OpenSlideImage"/> object.</param>
/// <param name="name">The property name.</param>
/// <param name="defaultValue">The default value.</param>
/// <returns>The value of the property or <paramref name="defaultValue"/>.</returns>
public static int GetProperty(this OpenSlideImage image, string name, int defaultValue)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
if (!image.TryGetProperty(name, out string?value))
{
return(defaultValue);
}
if (!int.TryParse(value, out var result))
{
return(defaultValue);
}
return(result);
}
public static byte[] GetAssociatedImageAsJpeg(this OpenSlideImage image, string name)
{
using (var img = WriteImage(image, name))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(img.Width *img.Height * 4 * 2));
try
{
using (var ms = new MemoryStream(buffer))
{
img.SaveAsJpeg(ms, new JpegEncoder());
ms.SetLength(ms.Position);
return(ms.ToArray());
}
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
public static byte[] GetThumbnailAsJpeg(this OpenSlideImage image, int maxSize)
{
using (var thumbnail = GenerateThumbnail(image, maxSize, maxSize))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(maxSize *maxSize * 4 * 2));
try
{
using (var ms = new MemoryStream(buffer))
{
thumbnail.SaveAsJpeg(ms, new JpegEncoder());
ms.SetLength(ms.Position);
return(ms.ToArray());
}
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
public static async Task GetThumbnailAsJpegToStreamAsync(this OpenSlideImage image, int maxSize, Stream stream)
{
using (var thumbnail = GenerateThumbnail(image, maxSize, maxSize))
{
byte[] buffer = ArrayPool <byte> .Shared.Rent(EnsureMinimumSize(maxSize *maxSize * 4 * 2));
try
{
using (var ms = new MemoryStream(buffer))
{
thumbnail.SaveAsJpeg(ms, new JpegEncoder());
ms.SetLength(ms.Position);
ms.Position = 0;
await ms.CopyToAsync(stream).ConfigureAwait(false);
}
}
finally
{
ArrayPool <byte> .Shared.Return(buffer);
}
}
}
private static Image <Bgra32> GenerateThumbnail(OpenSlideImage image, int maxWidth, int maxHeight)
{
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
(long width, long height) = image.Dimensions;
// Find the appropriate level
double downsampleWidth = width / (double)maxWidth;
double downsampleHeight = height / (double)maxHeight;
double downsample = Math.Max(downsampleWidth, downsampleHeight);
int level = image.GetBestLevelForDownsample(downsample);
(long levelWidth, long levelHeight) = image.GetLevelDimensions(level);
// Calculate target size
int targetWidth, targetHeight;
if (downsampleWidth > downsampleHeight)
{
targetWidth = maxWidth;
targetHeight = (int)(height / downsampleWidth);
}
else
{
targetWidth = (int)(width / downsampleHeight);
targetHeight = maxHeight;
}
using Bgra32ImageBuffer buffer = image.ReadImageBuffer(level, 0, 0, levelWidth, levelHeight);
return(buffer.GetImage().Clone(ctx =>
{
ctx.Resize(targetWidth, targetHeight);
}));
}
