private Bitmap resizeImageToBitmap(string trackingId, Image image, int width, int height)
{
var innerRect = ResizeMath.KeepRatio(image.Width, image.Height, width, height);
_log.info(trackingId, () => $"resize {image.Width}x{image.Height} --> {width}x{height} = [{innerRect.Top} {innerRect.Left} {innerRect.Width}x{innerRect.Height}]");
var destImage = new Bitmap(width, height);
destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (var graphics = Graphics.FromImage(destImage))
{
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
using (var wrapMode = new ImageAttributes())
{
wrapMode.SetWrapMode(WrapMode.TileFlipXY);
graphics.DrawImage(image, innerRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
}
fillMargins(graphics, width, height, innerRect, Brushes.Black);
}
return(destImage);
}
void IApi.Thumbnail(ISrvRequest request)
{
var config = _config;
var http = request.Http.Request;
var trackingId = request.TrackingId;
var url = http.Require("url");
var width = http.OptionalInt("width", config.thumbnail.defaultWidth);
var height = http.OptionalInt("height", config.thumbnail.defaultHeight);
if (!Uri.IsWellFormedUriString(url, UriKind.Absolute))
{
throw new ApplicationException($"Bad url '{url}'");
}
_log.info(trackingId, () => $"thumbnail request [{width} x {height}] for '{url}'");
var key = $"{url}_{width}x{height}";
_thumbnail.Process(new ThumbnailRequest {
Srv = request,
Key = key,
Url = url,
Width = width,
Height = height
});
}
private Task <byte[]> downloadImage(ThumbnailRequest request, string url)
{
var trackingId = request.Srv.TrackingId;
byte[] download()
{
try
{
_log.info(trackingId, () => $"Downloading '{url}'");
using (var web = new WebClient())
{
return
(web.DownloadData(url));
}
}
catch (Exception ex)
{
_log.error(trackingId, ex, $"Failed to download '{url}' ({ex.Message})");
return
(_helpers.TextToImage(request.Width, request.Height, $"{ex.Message} (trackingId={trackingId})"));
}
}
return
(Task.Run(() => download()));
}