/// <summary>
/// Applies the watermark to the image.
/// </summary>
/// <param name="imageToAddWatermarkTo">
/// The image to add the watermark to.
/// </param>
/// <param name="url"></param>
private static void ApplyWatermark(Image <Rgba32> imageToAddWatermarkTo, string url, IImageSettings imageSettings)
{
Contract.Requires(imageToAddWatermarkTo != null);
const int spacer = 5;
string watermarkFilename = imageSettings.WatermarkImage;
if (string.IsNullOrEmpty(watermarkFilename))
{
return;
}
if (!File.Exists(watermarkFilename))
{
return;
}
using (Image <Rgba32> watermark = SixLabors.ImageSharp.Image.Load(watermarkFilename)
.CloneAs <Rgba32>())
{
watermark.Mutate(operation: pc => pc.BackgroundColor(Color.Transparent));
int width = watermark.Width;
int height = watermark.Height;
using (Image <Rgba32> qr = QrCode.EncodeUrl(url))
{
if (qr != null)
{
qr.Mutate(operation: px => px.BackgroundColor(Color.Transparent));
int qrWidth = qr.Width;
int qrHeight = qr.Height;
int qrXPos = imageToAddWatermarkTo.Width - (qrWidth + spacer);
int qrYPos = imageToAddWatermarkTo.Height - (qrHeight + spacer);
width = watermark.Width + (qrWidth > 0 ? qrWidth + 2 * spacer : 0);
int maxHeight = Math.Max(val1: watermark.Height, qrHeight + spacer);
if (imageToAddWatermarkTo.Width <= width || imageToAddWatermarkTo.Height <= maxHeight)
{
return;
}
imageToAddWatermarkTo.Mutate(operation: pc =>
{
pc.DrawImage(image: qr,
new Point(x: qrXPos, y: qrYPos),
colorBlending: PixelColorBlendingMode.Overlay,
alphaComposition: PixelAlphaCompositionMode.SrcOver,
opacity: 1);
});
}
}
if (imageToAddWatermarkTo.Width <= width || imageToAddWatermarkTo.Height <= height)
{
return;
}
int x = imageToAddWatermarkTo.Width - width;
int y = imageToAddWatermarkTo.Height - height;
imageToAddWatermarkTo.Mutate(operation: pc =>
{
pc.DrawImage(image: watermark,
new Point(x: x, y: y),
colorBlending: PixelColorBlendingMode.Overlay,
alphaComposition: PixelAlphaCompositionMode.SrcOver,
opacity: 1);
});
}
}