/// <summary>
/// 添加icon
/// </summary>
public static byte[] AddIcon(this QrCode coder, byte[] bs, string icon_path)
{
using (var bm = ConvertHelper.BytesToBitmap(bs))
{
using (var ms = new MemoryStream())
{
using (var imageFactory = new ImageFactory(preserveExifData: true))
{
using (var iconFactory = new ImageFactory(preserveExifData: true))
{
var icon = iconFactory.Load(icon_path)
.Resize(new Size()
{
Width = bm.Width / 5, Height = bm.Height / 5
}).Image;
var overlay = new ImageLayer()
{
Image = icon,
Position = new Point((bm.Width - icon.Width) / 2, (bm.Height - icon.Height) / 2),
Size = new Size(icon.Width, icon.Height)
};
imageFactory.Load(bm)
.Overlay(overlay)
.Format(new JpegFormat {
Quality = 100
})
.Save(ms);
return(ms.ToArray());
}
}
}
}
}
/// <summary>
/// 带图标二维码，加上图标后请把容错级别调高，这样可以提高识别成功率
/// </summary>
public static byte[] GetQrCodeWithIconBytes(this QrCode coder,
string content, string icon_path, int size = QrCode.QRCODE_SIZE)
{
if (!File.Exists(icon_path))
{
throw new Exception("二维码水印图片不存在");
}
var bs = coder.GetQrCodeBytes(content, size);
using (var bm = ConvertHelper.BytesToBitmap(bs))
{
using (var g = Graphics.FromImage(bm))
{
using (var logo = Image.FromFile(icon_path))
{
using (var smallLogo = logo.GetThumbnailImage(bm.Width / 5, bm.Height / 5, null, IntPtr.Zero))
{
//把压缩后的图片绘制到二维码上
g.DrawImage(smallLogo, (bm.Width - smallLogo.Width) / 2, (bm.Height - smallLogo.Height) / 2);
}
}
}
return(bm.ToBytes(coder.Formart));
}
}
