/// <summary>
/// Extract region from source image
/// </summary>
/// <param name="imageUri">The <see cref="Uri"/> of the source image</param>
/// <param name="request">The <see cref="ImageRequest"/></param>
/// <param name="allowSizeAboveFull">Allow the output size to exceed the original dimensions of the image</param>
/// <param name="quality">The <see cref="ImageQuality"/> settings for encoding</param>
/// <returns></returns>
public async Task <(ProcessState, SKImage)> ExtractRegion(Uri imageUri, ImageRequest request, bool allowSizeAboveFull, TremendousIIIF.Common.Configuration.ImageQuality quality)
{
var sourceFormat = await GetSourceFormat(imageUri, request.RequestId);
switch (sourceFormat)
{
case ImageFormat.jp2:
return(J2KExpander.ExpandRegion(HttpClient, Log, imageUri, request, allowSizeAboveFull, quality));
case ImageFormat.tif:
return(TiffExpander.ExpandRegion(HttpClient, Log, imageUri, request, allowSizeAboveFull));
default:
throw new IOException("Unsupported source format");
}
}
public void RegionScale()
{
var filename = @"C:\JP2Cache\vdc_0000000388E8.0x000008";
var request = new ImageRequest
(
"",
new ImageRegion(ImageRegionMode.Region, 2048f, 0f, 9f, 1024f),
new ImageSize(ImageSizeMode.Distort, 1, 3, 0),
new ImageRotation(0, false),
ImageQuality.@default,
TremendousIIIF.Common.ImageFormat.jpg
);
var q = new C.ImageQuality();
(var state, var img) = J2KExpander.ExpandRegion(null, Log, new Uri(filename), request, false, q);
using (img)
{
Assert.AreEqual(3, img.Width);
Assert.AreEqual(342, img.Height);
}
}