/// <summary>取得图片文件的宽高</summary>
/// <param name="srcFile"></param>
/// <param name="ww">取得图片的宽度</param>
/// <param name="hh">取得图片的高度</param>
/// <returns></returns>
public static bool Get_Pic_WW_HH(string srcFile, out int ww, out int hh)
{
string sExt = DirFileHelper.GetFileExtension(srcFile).ToLower();
if (sExt == "gif" || sExt == "jpg" || sExt == "jpeg" || sExt == "bmp" || sExt == "png")
{
if (srcFile.IndexOf(":") < 0)
{
srcFile = DirFileHelper.GetMapPath(srcFile);
}
if (DirFileHelper.IsExistFile(srcFile))
{
try
{
Image testImage = Image.FromFile(srcFile);
ww = testImage.Width;
hh = testImage.Height;
testImage.Dispose();
return(true);
}
catch (Exception ex)
{
throw ex;
}
}
}
ww = 0;
hh = 0;
return(false);
}
/// <summary>在图片上生成图片水印</summary>
/// <param name="srcFile">要添加水印的图片</param>
/// <param name="top">上边距 为0时下边距生效</param>
/// <param name="bottom">下边距 上边距为0时生效</param>
/// <param name="left">左边距 为0时右边距生效</param>
/// <param name="right">右边距 左边距为0时生效</param>
/// <param name="limitWidth">原图小于该宽度,将不添加水印</param>
/// <param name="HighQuality">如果大于0，使用质量控制(50-100)</param>
/// <param name="_WaterPicPath">水印图片所在地址,默认:"/images/Water.png"</param>
public static void MakeWaterPic(string srcFile, int top = 0, int bottom = 10, int left = 0, int right = 10, int limitWidth = 300, int HighQuality = 0, string _WaterPicPath = "/images/Water.png")
{
#region 取得图片绝对地址
if (srcFile.IndexOf(":") < 0)
{
srcFile = DirFileHelper.GetMapPath(srcFile);
}
if (!DirFileHelper.IsExistFile(srcFile))
{
return;
}
#endregion
#region 取得水印图片
if (_WaterPicPath.IndexOf(":") < 0)
{
_WaterPicPath = DirFileHelper.GetMapPath(_WaterPicPath);
}
if (!DirFileHelper.IsExistFile(_WaterPicPath))
{
return;
}
#endregion
//---------------------------------------
#region 判断
Image srcImage = Image.FromFile(srcFile);
Image watImage = Image.FromFile(_WaterPicPath);
//水印图大于原图或原图小于300,不加水印
if (watImage.Width > srcImage.Width || srcImage.Width < limitWidth)
{
srcImage.Dispose();
watImage.Dispose();
return;
}
#endregion
//---------------------------------------
#region 位置
int x = 0, y = 0;
if (top != 0)
{
y = top;
if (left != 0)
{
x = left;
}
else
{
x = srcImage.Width - watImage.Width - right;
}
}
else if (bottom != 0)
{
y = srcImage.Height - watImage.Height - bottom;
if (left != 0)
{
x = left;
}
else
{
x = srcImage.Width - watImage.Width - right;
}
}
else
{
//居中
x = srcImage.Width / 2 - watImage.Width / 2;
y = srcImage.Height / 2 - watImage.Height / 2;
}
#endregion
//---------------------------------------
#region 保存
Bitmap bitmap = new Bitmap(srcImage);
Graphics g = Graphics.FromImage(bitmap);
g.DrawImage(watImage, new Rectangle(x, y, watImage.Width, watImage.Height), 0, 0, watImage.Width, watImage.Height, GraphicsUnit.Pixel);
srcImage.Dispose();
watImage.Dispose();
g.Dispose();
try
{
if (DirFileHelper.GetFileExtension(srcFile) == "png")
{
bitmap.Save(srcFile, System.Drawing.Imaging.ImageFormat.Png);
}
else//以jpg格式保存缩略图
{
//---------------------------------------
//高质量--使用分级图片质量
if (HighQuality > 0)
{
// 以下代码为保存图片时,设置压缩质量
EncoderParameters encoderParams = new EncoderParameters();
long[] quality = new long[1];
quality[0] = HighQuality; //50-100内
EncoderParameter encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
encoderParams.Param[0] = encoderParam;
//获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象.
ImageCodecInfo[] arrayICI = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegICI = null;
for (int i = 0; i < arrayICI.Length; i++)
{
if (arrayICI[i].FormatDescription.Equals("JPEG"))
{
jpegICI = arrayICI[i];//设置JPEG编码
break;
}
}
//---------------------------------------
bitmap.Save(srcFile, jpegICI, encoderParams);
}
else
{
bitmap.Save(srcFile, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
catch (Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
}
#endregion
}
/// <summary>生成缩略图</summary>
/// <param name="srcFile">原图片路径(服务器路径d:\web\upload\100.jpg)</param>
/// <param name="decFile">缩略图路径(服务器路径d:\web\upload\100.jpg)</param>
/// <param name="iMaxWidth">限制的宽度</param>
/// <param name="iMaxHeight">限制的高度</param>
/// <param name="highQuality">如果大于0，使用质量控制(50-100)</param>
/// <param name="CutType">0=按比例生成宽高，1=固定图片宽高，2=固定背景宽高，图片按比例生成</param>
public static void MakeThumbImage(string srcFile, string decFile, int iMaxWidth, int iMaxHeight, int highQuality = 0, int CutType = 0)
{
#region 取得路径
if (srcFile.IndexOf(":") < 0)
{
srcFile = DirFileHelper.GetMapPath(srcFile);
}
if (decFile.IndexOf(":") < 0)
{
decFile = DirFileHelper.GetMapPath(decFile);
}
if (!DirFileHelper.IsExistFile(srcFile))
{
return;
}
#endregion
//---------------------------------------
#region 原始图片宽高
Image srcImage = Image.FromFile(srcFile);
int iSrcWidth = srcImage.Width;
int iSrcHeight = srcImage.Height;
#endregion
//---------------------------------------
#region 读取新图片宽高
int toWidth = 0, toHeight = 0, x = 0, y = 0;
if (CutType == 1)//固定宽高
{
toWidth = iMaxWidth;
toHeight = iMaxHeight;
}
else
{
//如果原始图,高度大于宽度,按高度缩放,如果宽度大高度按宽度缩放（不变形）
//如果图片缩放后,还是比限制大,再进行缩放,直接宽同度都不超过限制
if ((iSrcWidth < iMaxWidth) && (iSrcHeight < iMaxHeight))
{
toWidth = iSrcWidth;
toHeight = iSrcHeight;
}
else
{
if (iSrcHeight > iSrcWidth)
{
toHeight = iMaxHeight;
toWidth = iSrcWidth * iMaxHeight / iSrcHeight;
if (toWidth > iMaxWidth)
{
//toHeight 必须在 toWidth 前
toHeight = toHeight * iMaxWidth / toWidth;
toWidth = iMaxWidth;
}
}
else
{
toHeight = iSrcHeight * iMaxWidth / iSrcWidth;
toWidth = iMaxWidth;
if (toHeight > iMaxHeight)
{
//toWidth 必须在 toHeight 前
toWidth = toWidth * iMaxHeight / toHeight;
toHeight = iMaxHeight;
}
}
}
}
#endregion
#region 输出
Bitmap bitmap;
if (CutType == 2)
{
//2=固定背景宽高，图片按比例生成
bitmap = new Bitmap(iMaxWidth, iMaxHeight);
if (toWidth <= iMaxWidth && toHeight <= iMaxHeight)
{
x = Convert.ToInt16((iMaxWidth - toWidth) / 2);
y = Convert.ToInt16((iMaxHeight - toHeight) / 2);
}
else
{
if (toWidth < toHeight)
{
x = Convert.ToInt16((iMaxWidth - toWidth) / 2);
}
else
{
y = Convert.ToInt16((iMaxHeight - toHeight) / 2);
}
}
}
else
{
bitmap = new Bitmap(toWidth, toHeight);
}
Graphics g = Graphics.FromImage(bitmap);
//高质量
//g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
//g.Clear(System.Drawing.Color.Transparent);
g.Clear(System.Drawing.Color.White);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(srcImage, new Rectangle(x, y, toWidth, toHeight), new Rectangle(0, 0, iSrcWidth, iSrcHeight), GraphicsUnit.Pixel);
srcImage.Dispose();
g.Dispose();
try
{
if (DirFileHelper.GetFileExtension(srcFile) == "png")
{
bitmap.Save(decFile, System.Drawing.Imaging.ImageFormat.Png);
}
else//以jpg格式保存缩略图
{
//---------------------------------------
//高质量--使用分级图片质量
if (highQuality > 0)
{
// 以下代码为保存图片时,设置压缩质量
var encoderParams = new EncoderParameters();
var quality = new long[1];
quality[0] = highQuality; //50-100内
var encoderParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality);
encoderParams.Param[0] = encoderParam;
//获得包含有关内置图像编码解码器的信息的ImageCodecInfo 对象.
ImageCodecInfo[] arrayIci = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo jpegIci = null;
for (int i = 0; i < arrayIci.Length; i++)
{
if (arrayIci[i].FormatDescription.Equals("JPEG"))
{
jpegIci = arrayIci[i];
//设置JPEG编码
break;
}
}
//---------------------------------------
bitmap.Save(decFile, jpegIci, encoderParams);
}
else
{
bitmap.Save(decFile, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
catch (Exception e)
{
throw e;
}
finally
{
bitmap.Dispose();
}
#endregion
}