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);
}
}
/// <summary>
/// Process image pipeline
/// <para>Region THEN Size THEN Rotation THEN Quality THEN Format</para>
/// </summary>
/// <param name="imageUri">The <see cref="Uri"/> of the source image</param>
/// <param name="request">The parsed and validated IIIF Image API request</param>
/// <param name="quality">Image output encoding quality settings</param>
/// <param name="allowSizeAboveFull">Allow output image dimensions to exceed that of the source image</param>
/// <param name="pdfMetadata">Optional PDF metadata fields</param>
/// <returns></returns>
public async Task <Stream> ProcessImage(Uri imageUri, ImageRequest request, Conf.ImageQuality quality, bool allowSizeAboveFull, Conf.PdfMetadata pdfMetadata)
{
var encodingStrategy = GetEncodingStrategy(request.Format);
if (encodingStrategy == EncodingStrategy.Unknown)
{
throw new ArgumentException("Unsupported format", "format");
}
var loader = new ImageLoader {
HttpClient = HttpClient, Log = Log
};
(var state, var imageRegion) = await loader.ExtractRegion(imageUri, request, allowSizeAboveFull, quality);
using (imageRegion)
{
var expectedWidth = state.OutputWidth;
var expectedHeight = state.OutputHeight;
var alphaType = request.Quality == ImageQuality.bitonal ? SKAlphaType.Opaque : SKAlphaType.Premul;
(var angle, var originX, var originY, var newImgWidth, var newImgHeight) = Rotate(expectedWidth, expectedHeight, request.Rotation.Degrees);
using (var surface = SKSurface.Create(width: newImgWidth, height: newImgHeight, colorType: SKImageInfo.PlatformColorType, alphaType: alphaType))
using (var canvas = surface.Canvas)
using (var region = new SKRegion())
{
// If the rotation parameter includes mirroring ("!"), the mirroring is applied before the rotation.
if (request.Rotation.Mirror)
{
canvas.Translate(newImgWidth, 0);
canvas.Scale(-1, 1);
}
canvas.Translate(originX, originY);
canvas.RotateDegrees(angle, 0, 0);
// reset clip rects to rotated boundaries
region.SetRect(new SKRectI(0 - (int)originX, 0 - (int)originY, newImgWidth, newImgHeight));
canvas.ClipRegion(region);
// quality
if (request.Quality == ImageQuality.gray || request.Quality == ImageQuality.bitonal)
{
var contrast = request.Quality == ImageQuality.gray ? 0.1f : 1f;
using (var cf = SKColorFilter.CreateHighContrast(true, SKHighContrastConfigInvertStyle.NoInvert, contrast))
using (var paint = new SKPaint())
{
paint.FilterQuality = SKFilterQuality.High;
paint.ColorFilter = cf;
canvas.DrawImage(imageRegion, new SKRect(0, 0, expectedWidth, expectedHeight), paint);
}
}
else
{
using (var paint = new SKPaint())
{
paint.FilterQuality = SKFilterQuality.High;
canvas.DrawImage(imageRegion, new SKRect(0, 0, expectedWidth, expectedHeight), paint);
}
}
return(Encode(surface,
expectedWidth,
expectedHeight,
encodingStrategy,
request.Format,
quality.GetOutputFormatQuality(request.Format),
pdfMetadata,
state.HorizontalResolution,
state.VerticalResolution));
}
}
}
public static (ProcessState state, SKImage image) ExpandRegion(HttpClient client, ILogger Log, Uri imageUri, ImageRequest request, bool allowSizeAboveFull, C.ImageQuality quality)
{
using (var compositor = new BitmapCompositor())
using (var env = new Ckdu_thread_env())
using (var family_src = new JPEG2000Source(Log, request.RequestId))
using (var wrapped_src = new Cjpx_source())
using (var imageDimensions = new Ckdu_dims())
using (var limiter = new Ckdu_quality_limiter(quality.WeightedRMSE))
{
Ckdu_codestream codestream = new Ckdu_codestream();
try
{
int num_threads = Ckdu_global_funcs.kdu_get_num_processors();
env.create();
for (int nt = 1; nt < num_threads; nt++)
{
if (!env.add_thread())
{
num_threads = nt;
}
}
Log.Debug("Created {@NumThreads} threads", num_threads);
family_src.Open(client, imageUri, false);
int success = wrapped_src.open(family_src, true);
if (success < 1)
{
family_src.close();
wrapped_src.close();
throw new IOException("could not be read as JPEG2000");
}
if (wrapped_src != null)
{
compositor.create(wrapped_src);
}
compositor.set_thread_env(env, null);
compositor.get_total_composition_dims(imageDimensions);
Ckdu_coords imageSize = imageDimensions.access_size();
Ckdu_coords imagePosition = imageDimensions.access_pos();
float imageScale = 1;
int ref_component = 0;
if (wrapped_src == null)
{
throw new IOException("could not be read as JPEG2000");
}
codestream.create(wrapped_src.access_codestream(ref_component).open_stream());
codestream.set_fast();
int originalWidth, originalHeight;
using (Ckdu_dims original_dims = new Ckdu_dims())
{
codestream.get_dims(ref_component, original_dims);
using (Ckdu_coords original_size = original_dims.access_size())
{
originalWidth = original_size.x;
originalHeight = original_size.y;
}
}
var kt = codestream.open_tile(new Ckdu_coords(0, 0), null);
var quality_layers = codestream.get_max_tile_layers();
var layers = quality.MaxQualityLayers;
if (layers < 0)
{
layers = quality_layers;
}
else if (layers == 0)
{
layers = Convert.ToInt32(Math.Ceiling(quality_layers / 2.0));
}
ushort ppi_x = 96, ppi_y = 96;
if (wrapped_src.access_layer(0).exists())
{
var accessLayer = wrapped_src.access_layer(0);
var resolution = accessLayer.access_resolution();
if (resolution.exists())
{
bool for_display = false;
float ypels_per_metre = resolution.get_resolution(for_display);
if (ypels_per_metre <= 0.0F)
{
for_display = true;
ypels_per_metre = resolution.get_resolution(for_display);
if (ypels_per_metre <= 0.0F)
{
ypels_per_metre = 1.0F;
}
}
float xpels_per_metre = ypels_per_metre * resolution.get_aspect_ratio(for_display);
ppi_x = Convert.ToUInt16(Math.Ceiling(xpels_per_metre * 0.0254));
ppi_y = Convert.ToUInt16(Math.Ceiling(ypels_per_metre * 0.0254));
}
}
var state = ImageRequestInterpreter.GetInterpretedValues(request, originalWidth, originalHeight, allowSizeAboveFull);
state.HorizontalResolution = ppi_x;
state.VerticalResolution = ppi_y;
Log.Debug("Image request {@Request}", state);
var scale = state.OutputScale;
var scaleDiff = 0f;
imageScale = state.ImageScale;
// needs to be able to handle regions
imageSize.x = Convert.ToInt32(Math.Round(state.RegionWidth / scale));
imageSize.y = Convert.ToInt32(Math.Round(state.RegionHeight / scale));
imagePosition.x = state.StartX;
imagePosition.y = state.StartY;
Ckdu_dims extracted_dims = new Ckdu_dims();
extracted_dims.assign(imageDimensions);
extracted_dims.access_size().x = Convert.ToInt32(Math.Round(imageSize.x * imageScale));
extracted_dims.access_size().y = Convert.ToInt32(Math.Round(imageSize.y * imageScale));
var viewSize = extracted_dims.access_size();
Log.Debug("add_ilayer extracted dimension: {@AccessPos}, {@AccessSize}, {@IsEmpty}, {@Scale}", extracted_dims.access_pos(), extracted_dims.access_size(), extracted_dims.is_empty(), scale);
compositor.add_ilayer(0, extracted_dims, extracted_dims);
compositor.set_scale(false, false, false, scale);
compositor.get_total_composition_dims(extracted_dims);
Log.Debug("get_total_composition_dims extracted dimension: {@AccessPos}, {@AccessSize}, {@IsEmpty}, {@Scale}", extracted_dims.access_pos(), extracted_dims.access_size(), extracted_dims.is_empty(), scale);
// check if the access size is the expected size as floating point rounding errors
// might occur
const float roundingValue = 0.0001f;
if (((scale - roundingValue) * imageSize.x > 1 && (scale - roundingValue) * imageSize.y > 1) &&
(scale * imageSize.x != viewSize.x ||
scale * imageSize.y != viewSize.y))
{
// attempt to correct by shifting rounding down
compositor.set_scale(false, false, false, 1, scale - roundingValue);
compositor.get_total_composition_dims(extracted_dims);
extracted_dims.access_size().x = Convert.ToInt32(Math.Round(imageSize.x * imageScale));
extracted_dims.access_size().y = Convert.ToInt32(Math.Round(imageSize.y * imageScale));
viewSize = extracted_dims.access_size();
}
var checkScale = compositor.check_invalid_scale_code();
if (0 != checkScale)
{
// we've come up with a scale factor which is (probably) way too small
// ask Kakadu to come up with a valid one that's close
var minScale = Ckdu_global.KDU_COMPOSITOR_SCALE_TOO_SMALL == checkScale ? scale : 0;
var maxScale = Ckdu_global.KDU_COMPOSITOR_SCALE_TOO_LARGE == checkScale ? scale : 1;
var optimal_scale = compositor.find_optimal_scale(extracted_dims, 0, minScale, maxScale);
scaleDiff = Ckdu_global.KDU_COMPOSITOR_SCALE_TOO_SMALL == checkScale ? optimal_scale - scale : scale - optimal_scale;
scale = optimal_scale;
compositor.set_scale(false, false, false, scale);
compositor.get_total_composition_dims(extracted_dims);
}
viewSize = extracted_dims.access_size();
Log.Debug("Extracted dimension: {@AccessPos}, {@AccessSize}, {@IsEmpty}, {@Scale}", extracted_dims.access_pos(), extracted_dims.access_size(), extracted_dims.is_empty(), scale);
compositor.set_buffer_surface(extracted_dims);
compositor.set_quality_limiting(limiter, quality.OutputDpi, quality.OutputDpi);
Log.Debug("Set quality limiting: {@Limiter}, {@HorizontalPPI}, {@VerticalPPI}", limiter, quality.OutputDpi, quality.OutputDpi);
compositor.set_max_quality_layers(layers);
Log.Debug("Set max quality layers: {@Layers}", layers);
var compositorBuffer = compositor.GetCompositionBitmap(extracted_dims);
using (Ckdu_dims newRegion = new Ckdu_dims())
{
// we're only interested in the final composited image
while (compositor.process(256000, newRegion))
{
}
using (var bmp = compositorBuffer.AcquireBitmap())
{
return(state, SKImage.FromBitmap(bmp));
}
}
}
finally
{
if (codestream.exists())
{
codestream.destroy();
}
if (env.exists())
{
env.destroy();
}
if (family_src != null)
{
family_src.close();
}
else if (wrapped_src != null)
{
wrapped_src.close();
}
}
}
}