///<summary>
/// 添加图片水印
/// </summary>
/// <param name="watermarkImageFile">水印图片</param>
/// <param name="sourceImageFile">原文件</param>
/// <param name="position">水印位置</param>
/// 时间：2015-12-17 15:48
/// 备注：
public static void AttachPng(string watermarkImageFile, string sourceImageFile, ImgWaterPosition position)
{
string sourceImgTmpPath = sourceImageFile.CreateTempFilePath();
Image sourceImg = Image.FromFile(sourceImgTmpPath);
ImageFormat sourceImgFmt = sourceImg.RawFormat;
int sourceImgH = sourceImg.Height,
sourceImaW = sourceImg.Width;
using (Bitmap sourceBmp = new Bitmap(sourceImaW, sourceImgH))
{
using (Graphics graphics = Graphics.FromImage(sourceBmp))
{
// 设置画布的描绘质量
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.DrawImage(sourceImg, new Rectangle(0, 0, sourceImaW, sourceImgH),
0, 0, sourceImaW, sourceImgH, GraphicsUnit.Pixel);
sourceImg.Dispose();
sourceImg = Image.FromFile(watermarkImageFile);
SetWaterMarkImagePosition(graphics, sourceImg, sourceImaW, sourceImgH, position);
}
SetWaterMarkImageQuality(sourceBmp, sourceImageFile, sourceImgFmt);
sourceImg.Dispose();
}
File.Delete(sourceImgTmpPath);
}
private static void SetWaterMarkImagePosition(Graphics sourceG, Image sourceImage, int sourceImageWidth, int sourceImageHight, ImgWaterPosition position)
{
Size sourceSize = CreateImageSize(sourceImageWidth, sourceImageHight, sourceImage);
int x = 0,
y = 0,
padding = 10;
switch (position)
{
case ImgWaterPosition.Center:
x = (sourceImageWidth - sourceSize.Width) / 2;
y = (sourceImageHight - sourceSize.Height) / 2;
break;
case ImgWaterPosition.TopLeft:
x = padding;
y = padding;
break;
case ImgWaterPosition.TopRight:
x = (sourceImageWidth - sourceSize.Width) - padding;
y = padding;
break;
case ImgWaterPosition.BottomLeft:
x = padding;
y = (sourceImageHight - sourceSize.Height) - padding;
break;
default:
x = (sourceImageWidth - sourceSize.Width) - padding;
y = (sourceImageHight - sourceSize.Height) - padding;
break;
}
sourceG.DrawImage(sourceImage, new Rectangle(x, y, sourceSize.Width, sourceSize.Height),
0, 0, sourceImage.Width, sourceImage.Height, GraphicsUnit.Pixel);
}
