CODEWITHSUNDEEP
c#
mohammad
mohammad

Reputation: 1026

Add watermark to Image when it uploaded

I have a function to upload image with Ajax and and another function for add watermark on image and both of them worked correctly.

My watermark function get image from directory, but I want to pass image to watermark() before save image on server. Is there any way to do this?

Here is my Code:

Upload function

[HttpPost]
public ActionResult FileUpload()
{
    byte[] ImageData = null;
    HttpPostedFileBase file = Request.Files[0];
    var input = file.InputStream;
    input.Position = 0;
    using (var ms = new MemoryStream())
    {
        var length = Convert.ToInt32(input.Length);
        input.CopyTo(ms, length);
        ImageData = ms.ToArray();
    }
    Stream fileContent = file.InputStream;
    var filepath = "~/NewFolder/File/";
    string targetFolder = Server.MapPath(filepath);
    string targetPath = Path.Combine(targetFolder, file.FileName);

    //***** Here is place that I want to pass Image has been uploaded to Watermark()
    //***** In this case Watermark() get an image from dir : @"D:\cc\image.png"
    Watermark(@"D:\cc\image.png", "mohammad", @"D:\cc\w.png", ImageFormat.Png);


    file.SaveAs(targetPath);
    return Json(new { message = Request.Files.Count });
}

Watermark Function

public void Watermark(string sourceImage, string text, string targetImage, ImageFormat fmt)
{
    try
    {
        // open source image as stream and create a memorystream for output
        var source = new FileStream(sourceImage, FileMode.Open);
        Stream output = new MemoryStream();
        Image img = Image.FromStream(source);

        // choose font for text
        Font font = new Font("Arial", 20, FontStyle.Bold, GraphicsUnit.Pixel);

        //choose color and transparency
        Color color = Color.FromArgb(100, 255, 0, 0);

        //location of the watermark text in the parent image
        Point pt = new Point(10, 5);
        SolidBrush brush = new SolidBrush(color);

        //draw text on image
        Graphics graphics = Graphics.FromImage(img);
        graphics.DrawString(text, font, brush, pt);
        graphics.Dispose();

        //update image memorystream
        img.Save(output, fmt);
        Image imgFinal = Image.FromStream(output);

        //write modified image to file
        Bitmap bmp = new System.Drawing.Bitmap(img.Width, img.Height, img.PixelFormat);
        Graphics graphics2 = Graphics.FromImage(bmp);
        graphics2.DrawImage(imgFinal, new Point(0, 0));
        bmp.Save(targetImage, fmt);

        imgFinal.Dispose();
        img.Dispose();
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

Upvotes: 0

Views: 1199

Answers (1)

Andrii Litvinov
Andrii Litvinov

Reputation: 13182

You can pass file.InputStream directly to Watermark method, where you already use Image.FromStream method. So you will directly read image from input stream.

Upvotes: 2

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