public void RenderThumbnailToHttpOutput(ThumbnailOptions options)
{
HttpContext.Current.Response.ContentType = "image/jpeg";
HttpContext.Current.Response.WriteFile(GetThumbnailPhysicalPath(options));
}
public string GetThumbnailPhysicalPath(ThumbnailOptions options)
{
string thumbPath = WebUtility.MapPath("datastore/filemanager/thumbnails/" + options.GenerateFilename(sprocketFileID.Value));
if (File.Exists(thumbPath))
{
if (new FileInfo(thumbPath).CreationTime > new FileInfo(PhysicalPath).CreationTime)
{
return(thumbPath);
}
else
{
File.Delete(thumbPath);
}
}
Image img = Image.FromFile(PhysicalPath);
Image thumb = new Bitmap(options.OuterWidth, options.OuterHeight);
Graphics gfx = Graphics.FromImage(thumb);
gfx.CompositingQuality = CompositingQuality.HighQuality;
gfx.SmoothingMode = SmoothingMode.HighQuality;
gfx.InterpolationMode = InterpolationMode.HighQualityBicubic;
Brush fill = new SolidBrush(options.BackgroundColor);
Pen pen = new Pen(options.BorderColor, options.BorderWidth);
pen.Alignment = PenAlignment.Inset;
gfx.FillRectangle(fill, 0, 0, options.OuterWidth, options.OuterHeight);
if (options.BorderWidth > 0)
{
gfx.DrawRectangle(pen, 0, 0, options.OuterWidth - 1, options.OuterHeight - 1);
}
Rectangle rect = new Rectangle(0, 0, img.Width, img.Height);
if (img.Width > img.Height)
{
rect.Width = options.InnerWidth;
rect.Height = (int)(((float)img.Height / (float)img.Width) * (float)options.InnerWidth);
}
else
{
rect.Height = options.InnerHeight;
rect.Width = (int)(((float)img.Width / (float)img.Height) * (float)options.InnerHeight);
}
int xremain = options.OuterWidth - rect.Width;
int yremain = options.OuterHeight - rect.Height;
rect.X = xremain / 2;
rect.Y = yremain / 2;
if (xremain % 2 == 1)
{
rect.Width++;
}
if (yremain % 2 == 1)
{
rect.Height++;
}
gfx.DrawImage(img, rect);
ImageCodecInfo[] encoders = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo encoder = null;
for (int i = 0; i < encoders.Length; i++)
{
if (encoders[i].MimeType == "image/jpeg")
{
encoder = encoders[i];
break;
}
}
if (encoder == null)
{
throw new SprocketException("Can't create a thumbnail because no JPEG encoder exists.");
}
EncoderParameters prms = new EncoderParameters(1);
prms.Param[0] = new EncoderParameter(Encoder.Quality, 70L);
thumb.Save(thumbPath, encoder, prms);
img.Dispose();
thumb.Dispose();
return(thumbPath);
}
