/// <summary>
/// 添加水印
/// </summary>
/// <param name="originalImagePath">源图相对路径，相对于网站根目录。如：wwwroot/upload/image/a.jpg</param>
public static void AddWaterMark(string originalImagePath)
{
string filename = "";
string extension = Path.GetExtension(originalImagePath);
filename = originalImagePath.Replace(extension, "WaterMark" + extension);
var waterMarkConfig = ConfigHelper.Get <WaterMarkConfig>();
WaterMarkText waterMarkTextInfo = waterMarkConfig.WaterMarkTextInfo;
WaterMarkImage waterMarkImageInfo = waterMarkConfig.WaterMarkImageInfo;
int waterMarkType = waterMarkConfig.WaterMarkType;
float transparence = Convert.ToSingle(waterMarkImageInfo.Transparence) / 100f;
string str5 = FileHelper.MapPath("~/") + Path.DirectorySeparatorChar.ToString();
originalImagePath = str5 + originalImagePath;
filename = str5 + filename;
Image image = null;
try
{
image = Image.FromFile(originalImagePath);
}
catch (FileNotFoundException ex)
{
throw new Exception(ex.Message);
}
Bitmap bitmap = new Bitmap(image.Width, image.Height, PixelFormat.Format24bppRgb);
Graphics picture = Graphics.FromImage(bitmap);
picture.Clear(Color.Green);
picture.SmoothingMode = SmoothingMode.HighQuality;
picture.InterpolationMode = InterpolationMode.High;
picture.DrawImage(image, 0, 0, image.Width, image.Height);
switch (waterMarkType)
{
case 0:
AddWatermarkText(picture, waterMarkTextInfo, image.Width, image.Height);
break;
case 1:
AddWatermarkImage(picture, waterMarkImageInfo, image.Width, image.Height, transparence);
break;
}
try
{
bitmap.Save(filename, ImageFormat.Jpeg);
}
catch (ArgumentNullException ex)
{
throw new Exception(ex.Message);
}
finally
{
bitmap.Dispose();
image.Dispose();
picture.Dispose();
}
FileHelper.Delete(originalImagePath, FileMethod.File);
string newFile = filename.Replace("WaterMark", "");
FileHelper.Move(filename, newFile, FileMethod.File);
}
/// <summary>
/// 添加图片水印
/// </summary>
/// <param name="picture">Graphics对象</param>
/// <param name="waterMarkImageInfo">图片水印对象</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
/// <param name="transparence">透明度</param>
private static void AddWatermarkImage(Graphics picture, WaterMarkImage waterMarkImageInfo, int width, int height, float transparence)
{
string filename = FileHelper.MapPath("~/" + waterMarkImageInfo.ImagePath);
string waterMarkPosition = waterMarkImageInfo.WaterMarkPosition;
int waterMarkPositionX = waterMarkImageInfo.WaterMarkPositionX;
int waterMarkPositionY = waterMarkImageInfo.WaterMarkPositionY;
Image image = null;
try
{
image = new Bitmap(filename);
}
catch (ArgumentException ex)
{
throw new Exception(ex.Message);
}
ColorMap map = new ColorMap
{
OldColor = Color.FromArgb(255, 0, 255, 0),
NewColor = Color.FromArgb(0, 0, 0, 0)
};
ColorMap[] mapArray = new ColorMap[] { map };
ImageAttributes imageAttr = new ImageAttributes();
imageAttr.SetRemapTable(mapArray, ColorAdjustType.Bitmap);
float[][] numArray2 = new float[5][];
float[] numArray3 = new float[5];
numArray3[0] = 1f;
numArray2[0] = numArray3;
float[] numArray4 = new float[5];
numArray4[1] = 1f;
numArray2[1] = numArray4;
float[] numArray5 = new float[5];
numArray5[2] = 1f;
numArray2[2] = numArray5;
float[] numArray6 = new float[5];
numArray6[3] = transparence;
numArray2[3] = numArray6;
float[] numArray7 = new float[5];
numArray7[4] = 1f;
numArray2[4] = numArray7;
float[][] newColorMatrix = numArray2;
ColorMatrix matrix = new ColorMatrix(newColorMatrix);
imageAttr.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int x = 0;
int y = 0;
int num5 = 0;
int num6 = 0;
double num7 = 1.0;
int num8 = (waterMarkImageInfo.WaterMarkPercent == 0) ? 4 : waterMarkImageInfo.WaterMarkPercent;
int num9 = (waterMarkImageInfo.WaterMarkThumbPercent == 0) ? 1 : waterMarkImageInfo.WaterMarkThumbPercent;
if (waterMarkImageInfo.WaterMarkPercentType == "ManualSet")
{
num7 = 1.0 / Convert.ToDouble(num9);
}
else
{
double num10 = Convert.ToDouble((int)(width / num8));
double num11 = Convert.ToDouble((int)(height / num8));
double num12 = Convert.ToDouble(image.Width);
double num13 = Convert.ToDouble(image.Height);
if ((width > (image.Width * num8)) && (height > (image.Height * num8)))
{
num7 = 1.0;
}
else if ((width > (image.Width * num8)) && (height < (image.Height * num8)))
{
num7 = num11 / num13;
}
else if ((width < (image.Width * num8)) && (height > (image.Height * num8)))
{
num7 = num10 / num12;
}
else if ((width * image.Height) > (height * image.Width))
{
num7 = num11 / num13;
}
else
{
num7 = num10 / num12;
}
}
num5 = Convert.ToInt32((double)(image.Width * num7));
num6 = Convert.ToInt32((double)(image.Height * num7));
string str3 = waterMarkPosition;
if (str3 != null)
{
if (!(str3 == "WM_TOP_LEFT"))
{
if (str3 == "WM_TOP_RIGHT")
{
x = (width - num5) - 10;
y = 10;
}
else if (str3 == "WM_BOTTOM_RIGHT")
{
x = (width - num5) - 10;
y = (height - num6) - 10;
}
else if (str3 == "WM_BOTTOM_LEFT")
{
x = 10;
y = (height - num6) - 10;
}
else if (str3 == "WM_SetByManual")
{
x = waterMarkPositionX;
y = waterMarkPositionY;
}
}
else
{
x = 10;
y = 10;
}
}
try
{
picture.DrawImage(image, new Rectangle(x, y, num5, num6), 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, imageAttr);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
image.Dispose();
imageAttr.Dispose();
}
}
