public async Task <IHttpActionResult> Filter(string flt, string crd)
{
var tracer = Request.GetConfiguration().Services.GetTraceWriter();
if (!Request.TryToBitmap(out var img) || img.PixelFormat != PixelFormat.Format32bppArgb ||
img.Width > 1000 || img.Height > 1000)
{
tracer.Info(Request, ControllerContext.ControllerDescriptor.ControllerType.FullName, "Incorrect PNG");
return(BadRequest());
}
var rect = (Rectangle)(new RectangleConverter().ConvertFromInvariantString(crd) ?? Rectangle.Empty);
rect = Rectangle.Intersect(rect.Normalise(), new Rectangle(0, 0, img.Width, img.Height));
if (rect.IsEmpty || rect.Width == 0 || rect.Height == 0)
{
tracer.Info(Request, ControllerContext.ControllerDescriptor.ControllerType.FullName, "Empty rectangle");
return(StatusCode(HttpStatusCode.NoContent));
}
tracer.Info(Request, ControllerContext.ControllerDescriptor.ControllerType.FullName, "Filter begin");
img = img.Clone(rect, img.PixelFormat);
rect.X = 0;
rect.Y = 0;
var bytes = rect.Width * rect.Height;
var argbValues = img.ToArray(rect);
var filter = ImageFilters.FromString(flt, out var byteLevel);
for (var i = 0; i < bytes; i++)
{
argbValues[i] = filter((uint)argbValues[i], byteLevel);
}
tracer.Info(Request, ControllerContext.ControllerDescriptor.ControllerType.FullName, "Filter end");
return(await Task.FromResult(new OkResult(argbValues.ToBitmap(rect.Width, rect.Height))));
}