Draw border around bitmap

Question

I have got a System.Drawing.Bitmap in my code.

The width is fix, the height varies.

What I want to do, is to add a white border around the bitma

Answer 1

Below function will add border around the bitmap image. Original image will increase in size by the width of border.

private static Bitmap DrawBitmapWithBorder(Bitmap bmp, int borderSize = 10)
{
    int newWidth = bmp.Width + (borderSize * 2);
    int newHeight = bmp.Height + (borderSize * 2);

    Image newImage = new Bitmap(newWidth, newHeight);
    using (Graphics gfx = Graphics.FromImage(newImage))
    {
        using (Brush border = new SolidBrush(Color.White))
        {
            gfx.FillRectangle(border, 0, 0,
                newWidth, newHeight);
        }
        gfx.DrawImage(bmp, new Rectangle(borderSize, borderSize, bmp.Width, bmp.Height));

    }
    return (Bitmap)newImage;
}