public static void MarkWater(string filepath, string waterfile, string watermarkPosition)
{
byte[] barrImgData = System.IO.File.ReadAllBytes(filepath);
byte[] barrWaterImgData = System.IO.File.ReadAllBytes(waterfile);
MemoryStream msImg = new MemoryStream(barrImgData);
MemoryStream msWaterImg = new MemoryStream(barrWaterImgData);
Image img = null;
Image markImg = null;
try
{
img = Image.FromStream(msImg);
markImg = Image.FromStream(msWaterImg);
float[][] ptsArray =
{
new float[] { 1, 0, 0, 0, 0 },
new float[] { 0, 1, 0, 0, 0 },
new float[] { 0, 0, 1, 0, 0 },
new float[] { 0, 0, 0, 1.0f, 0 }, //注意：此处为0.0f为完全透明，1.0f为完全不透明
new float[] { 0, 0, 0, 0, 1 }
};
ColorMatrix colorMatrix = new ColorMatrix(ptsArray);
ImageAttributes imageAttributes = new ImageAttributes();
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.SkipGrays, ColorAdjustType.Bitmap);
Bitmap newBitmap = new Bitmap(img.Width, img.Height, PixelFormat.Format48bppRgb);
newBitmap.SetResolution(img.HorizontalResolution, img.VerticalResolution);
Graphics g = Graphics.FromImage(newBitmap);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
Rectangle watermarkRectangle = PicHandle.GetWatermarkRectangle(img.Width, img.Height, markImg.Width, markImg.Height, watermarkPosition);
g.DrawImage(markImg, watermarkRectangle, 0, 0, markImg.Width, markImg.Height, GraphicsUnit.Pixel, imageAttributes);
g.Dispose();
ImageFormat igf = img.RawFormat;
if (img != null)
{
img.Dispose();
}
newBitmap.Save(filepath, igf);
newBitmap.Dispose();
}
catch (Exception exp)
{
XMS.Core.Container.LogService.Error("水印出错：" + exp.ToString());
}
finally
{
if (img != null)
{
img.Dispose();
}
if (markImg != null)
{
markImg.Dispose();
}
}
}
