public static bool extract_thumbnail(Guid?applicationId, DocFileInfo sourceFile, byte[] sourceContent,
DocFileInfo destFile, int x, int y, int width, int height, int thumbnailWidth, int thumbnailHeight,
ref Image retImage, ref string message, ref IconMeta meta)
{
try
{
if (sourceContent == null || sourceContent.Length == 0)
{
return(false);
}
bool result = true;
using (MemoryStream stream = new MemoryStream(sourceContent))
using (Bitmap image = Bitmap.FromStream(stream) as Bitmap)
{
if (image.Width < thumbnailWidth || image.Height < thumbnailHeight)
{
message = "{\"ErrorText\":\"" + Messages.ImageSizeIsNotValid.ToString() + "\"}";
image.Dispose();
return(false);
}
if (x < 0 || y < 0 || width <= 0 || height <= 0)
{
double aspectRatio = (double)thumbnailWidth / (double)thumbnailHeight;
int min = ((double)image.Width / (double)thumbnailWidth) < ((double)image.Height / (double)thumbnailHeight) ?
image.Width : image.Height;
if (min == image.Width)
{
width = image.Width;
height = (int)Math.Floor((double)width / aspectRatio);
}
else
{
height = image.Height;
width = (int)Math.Floor((double)height * aspectRatio);
}
x = (image.Width - width) / 2;
y = (image.Height - height) / 2;
}
meta = new IconMeta()
{
X = x,
Y = y,
Width = width,
Height = height,
Icon = destFile,
HighQualityIcon = sourceFile
};
message = meta.toJson(applicationId);
Rectangle rect = new Rectangle(x, y, width, height);
using (Bitmap target = new Bitmap(rect.Width, rect.Height))
{
Graphics g = Graphics.FromImage(target);
g.DrawImage(image, new Rectangle(0, 0, target.Width, target.Height), rect, GraphicsUnit.Pixel);
result = make_thumbnail(target as Image,
thumbnailWidth, thumbnailHeight, 0, 0, ref retImage, ref message, true);
}
if (!result)
{
message = "{\"ErrorText\":\"" + Messages.OperationFailed + "\"}";
}
return(result);
}
}
catch { message = "{\"ErrorText\":\"" + Messages.OperationFailed + "\"}"; return(false); }
}
