/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode,
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
string fileExtemsion = System.IO.Path.GetExtension(originalImagePath).ToLower();
ImageFormat imgF = ImageFormat.Png;
switch (fileExtemsion)
{
case ".gif":
imgF = ImageFormat.Gif;
break;
case ".jpg":
imgF = ImageFormat.Jpeg;
break;
case ".bmp":
imgF = ImageFormat.Bmp;
break;
case ".png":
imgF = ImageFormat.Png;
break;
}
MakeThumbnail(originalImagePath, thumbnailPath, width, height, mode,
imgF,
interpolationMode, smoothingMode);
}
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, string mode)
{
MakeThumbnailMode makeThumbnailMode = MakeThumbnailMode.None;
switch (mode)
{
case "HW": //指定高宽缩放（可能变形）
makeThumbnailMode = MakeThumbnailMode.HW;
break;
case "W": //指定宽，高按比例
makeThumbnailMode = MakeThumbnailMode.W;
break;
case "H": //指定高，宽按比例
makeThumbnailMode = MakeThumbnailMode.H;
break;
case "Cut": //指定高宽裁减（不变形）
makeThumbnailMode = MakeThumbnailMode.Cut;
break;
default:
break;
}
MakeThumbnail(originalImagePath, thumbnailPath, width, height, makeThumbnailMode);
}
/// <summary>
/// 生成图片水印缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">水印缩略图保存路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="waterMarkPicPath">水印图片</param>
/// <param name="watermarkPosition">水印位置</param>
/// <param name="transparentValue">水印透明度</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeImageWaterThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, string waterMarkPicPath,
string watermarkPosition = "WM_CENTER", int transparentValue = 30,
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
MakeImageWaterThumbnail(originalImagePath, thumbnailPath, width, height, mode, ImageFormat.Png,
waterMarkPicPath, watermarkPosition, transparentValue,
interpolationMode, smoothingMode);
}
///// <summary>创建规定大小的图像/// 源图像只能是JPG格式
///// </summary>
///// <param name="oPath">源图像绝对路径</param>
///// <param name="tPath">生成图像绝对路径</param>
///// <param name="width">生成图像的宽度</param>
///// <param name="height">生成图像的高度</param>
//public void CreateImage(string oPath, string tPath, int width, int height)
//{
//Bitmap originalBmp = new Bitmap(oPath);
//// 源图像在新图像中的位置
//int left, top;
//if (originalBmp.Width <= width && originalBmp.Height <= height)
//{
//// 原图像的宽度和高度都小于生成的图片大小
//left = (int)Math.Round((decimal)(width - originalBmp.Width) / 2);
//top = (int)Math.Round((decimal)(height - originalBmp.Height) / 2);
//// 最终生成的图像
//Bitmap bmpOut = new Bitmap(width, height);
//using (Graphics graphics = Graphics.FromImage(bmpOut))
//{
//// 设置高质量插值法
//graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
//// 清空画布并以白色背景色填充
//graphics.Clear(Color.White);
//// 把源图画到新的画布上
//graphics.DrawImage(originalBmp, left, top, originalBmp.Width, originalBmp.Height);
//}
//bmpOut.Save(tPath);
//bmpOut.Dispose();
//originalBmp.Dispose();
//return;
//}
//// 新图片的宽度和高度，如400*200的图像，想要生成160*120的图且不变形，
//// 那么生成的图像应该是160*80，然后再把160*80的图像画到160*120的画布上
//int newWidth, newHeight;
//if (width * originalBmp.Height < height * originalBmp.Width)
//{
//newWidth = width;
//newHeight = (int)Math.Round((decimal)originalBmp.Height * width / originalBmp.Width);
//// 缩放成宽度跟预定义的宽度相同的，即left=0，计算top
//left = 0;
//top = (int)Math.Round((decimal)(height - newHeight) / 2);
//}
//else
//{
//newWidth = (int)Math.Round((decimal)originalBmp.Width * height / originalBmp.Height);
//newHeight = height;
//// 缩放成高度跟预定义的高度相同的，即top=0，计算left
//left = (int)Math.Round((decimal)(width - newWidth) / 2);
//top = 0;
//}
//// 生成按比例缩放的图，如：160*80的图
//Bitmap bmpOut2 = new Bitmap(newWidth, newHeight);
//using (Graphics graphics = Graphics.FromImage(bmpOut2))
//{
//graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
//graphics.FillRectangle(Brushes.White, 0, 0, newWidth, newHeight);
//graphics.DrawImage(originalBmp, 0, 0, newWidth, newHeight);
//}
//// 再把该图画到预先定义的宽高的画布上，如160*120
//Bitmap lastbmp = new Bitmap(width, height);
//using (Graphics graphics = Graphics.FromImage(lastbmp))
//{
//// 设置高质量插值法
//graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
//// 清空画布并以白色背景色填充
//graphics.Clear(Color.White);
//// 把源图画到新的画布上
//graphics.DrawImage(bmpOut2, left, top);
//}
//lastbmp.Save(tPath);
//lastbmp.Dispose();
//originalBmp.Dispose();
//}
///// <summary>
///// Creates a thumbnail from an existing image. Sets the biggest dimension of the
///// thumbnail to either desiredWidth or Height and scales the other dimension down
///// to preserve the aspect ratio
///// </summary>
///// <param name="imageStream">stream to create thumbnail for</param>
///// <param name="desiredWidth">maximum desired width of thumbnail</param>
///// <param name="desiredHeight">maximum desired height of thumbnail</param>
///// <returns>Bitmap thumbnail</returns>
//public Bitmap CreateThumbnail(Bitmap originalBmp, int desiredWidth, int desiredHeight)
//{
//// If the image is smaller than a thumbnail just return it
//if (originalBmp.Width <= desiredWidth && originalBmp.Height <= desiredHeight)
//{
//return originalBmp;
//}
//int newWidth, newHeight;
//// scale down the smaller dimension
//if (desiredWidth * originalBmp.Height < desiredHeight * originalBmp.Width)
//{
//newWidth = desiredWidth;
//newHeight = (int)Math.Round((decimal)originalBmp.Height * desiredWidth / originalBmp.Width);
//}
//else
//{
//newHeight = desiredHeight;
//newWidth = (int)Math.Round((decimal)originalBmp.Width * desiredHeight / originalBmp.Height);
//}
//// This code creates cleaner (though bigger) thumbnails and properly
//// and handles GIF files better by generating a white background for
//// transparent images (as opposed to black)
//// This is preferred to calling Bitmap.GetThumbnailImage()
//Bitmap bmpOut = new Bitmap(newWidth, newHeight);
//using (Graphics graphics = Graphics.FromImage(bmpOut))
//{
//graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
//graphics.FillRectangle(Brushes.White, 0, 0, newWidth, newHeight);
//graphics.DrawImage(originalBmp, 0, 0, newWidth, newHeight);
//}
//return bmpOut;
//}
#endregion
#endregion
#region 生成缩略图同时生成水印
/// <summary>
/// 生成文字水印缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">水印缩略图保存路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="watermarkText">水印文字</param>
/// <param name="watermarkPosition">水印位置</param>
/// <param name="fontFamily">水印字体样式</param>
/// <param name="fontSize">水印字体大小</param>
/// <param name="fontColor">水印字体颜色</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeTextWaterThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, string watermarkText,
string watermarkPosition = "WM_CENTER", string fontFamily = "arial",
int fontSize = 14, string fontColor = "#FFFFFF",
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
MakeTextWaterThumbnail(originalImagePath, thumbnailPath, width, height, mode,
ImageFormat.Png, watermarkText, watermarkPosition, fontFamily, fontSize, fontColor,
interpolationMode, smoothingMode);
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="imageFormat">图片保存格式</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>当原图尺寸小于指定缩略尺寸时, 不进行缩略, 直接输出原图, 并且不更改尺寸.</remarks>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, System.Drawing.Imaging.ImageFormat imageFormat,
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
using (Image originalImage = Image.FromFile(originalImagePath))
{
Graphics graphics;
Bitmap bitmap = GetThumbnail(originalImage, width, height, mode, out graphics,
interpolationMode, smoothingMode);
try
{
//以xxx格式保存缩略图
bitmap.Save(thumbnailPath, imageFormat);
}
finally
{
bitmap.Dispose();
graphics.Dispose();
}
}
}
/// <summary>
/// 生成图片水印缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">水印缩略图保存路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="imageFormat">图片保存格式</param>
/// <param name="waterMarkPicPath">水印图片</param>
/// <param name="watermarkPosition">水印位置</param>
/// <param name="transparentValue">水印透明度</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeImageWaterThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, ImageFormat imageFormat, string waterMarkPicPath,
string watermarkPosition = "WM_CENTER", int transparentValue = 30,
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
using (Image originalImage = Image.FromFile(originalImagePath))
{
Graphics picture;
Bitmap bitmap = GetThumbnail(originalImage, width, height, mode, out picture,
interpolationMode, smoothingMode);
Image watermark = new Bitmap(waterMarkPicPath);
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float tranValue = (float)transparentValue / 100;
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, tranValue, 0.0f }, //透明度默认值为0.3
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
int watermarkWidth = 0;
int watermarkHeight = 0;
double bl = 1d;
//计算水印图片的比率
//取背景的1/4宽度来比较
if ((bitmap.Width > watermark.Width * 4) && (bitmap.Height > watermark.Height * 4))
{
bl = 1;
}
else if ((bitmap.Width > watermark.Width * 4) && (bitmap.Height < watermark.Height * 4))
{
bl = Convert.ToDouble(bitmap.Height / 4) / Convert.ToDouble(watermark.Height);
}
else
if ((bitmap.Width < watermark.Width * 4) && (bitmap.Height > watermark.Height * 4))
{
bl = Convert.ToDouble(bitmap.Width / 4) / Convert.ToDouble(watermark.Width);
}
else
{
if ((bitmap.Width * watermark.Height) > (bitmap.Height * watermark.Width))
{
bl = Convert.ToDouble(bitmap.Height / 4) / Convert.ToDouble(watermark.Height);
}
else
{
bl = Convert.ToDouble(bitmap.Width / 4) / Convert.ToDouble(watermark.Width);
}
}
watermarkWidth = Convert.ToInt32(watermark.Width * bl);
watermarkHeight = Convert.ToInt32(watermark.Height * bl);
switch (watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = 10;
ypos = 10;
break;
case "WM_TOP_RIGHT":
xpos = bitmap.Width - watermarkWidth - 10;
ypos = 10;
break;
case "WM_BOTTOM_RIGHT":
xpos = bitmap.Width - watermarkWidth - 10;
ypos = bitmap.Height - watermarkHeight - 10;
break;
case "WM_BOTTOM_LEFT":
xpos = 10;
ypos = bitmap.Height - watermarkHeight - 10;
break;
case "WM_CENTER":
xpos = bitmap.Width / 2 - (watermarkWidth / 2);
ypos = bitmap.Height / 2 - (watermarkHeight / 2);
break;
}
picture.DrawImage(watermark, new Rectangle(xpos, ypos, watermarkWidth, watermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
try
{
//以xxx格式保存缩略+水印图
bitmap.Save(thumbnailPath, imageFormat);
}
finally
{
watermark.Dispose();
imageAttributes.Dispose();
bitmap.Dispose();
picture.Dispose();
}
}
}
/// <summary>
/// 生成文字水印缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">水印缩略图保存路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="imageFormat">图片保存格式</param>
/// <param name="watermarkText">水印文字</param>
/// <param name="watermarkPosition">水印位置</param>
/// <param name="fontFamily">水印字体样式</param>
/// <param name="fontSize">水印字体大小</param>
/// <param name="fontColor">水印字体颜色</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeTextWaterThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, ImageFormat imageFormat, string watermarkText,
string watermarkPosition = "WM_CENTER", string fontFamily = "arial",
int fontSize = 14, string fontColor = "#FFFFFF",
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
//using (Image originalImage = Image.FromFile(originalImagePath))
//{
//Bitmap bitmap = GetThumbnail(originalImage, width, height, mode, out picture,
// interpolationMode, smoothingMode);
//Font crFont = new Font(fontFamily, fontSize);
//SizeF crSize = picture.MeasureString(watermarkText, crFont);
//float xpos = 0;
//float ypos = 0;
//switch (watermarkPosition)
//{
// case "WM_TOP_LEFT":
// xpos = (crSize.Width / 2);
// ypos = 8;
// break;
// case "WM_TOP_RIGHT":
// xpos = ((float)bitmap.Width * (float)1.00) - (crSize.Width / 2);
// ypos = 8;
// break;
// case "WM_BOTTOM_RIGHT":
// xpos = ((float)bitmap.Width * (float)1.00) - (crSize.Width / 2);
// ypos = ((float)bitmap.Height * (float)1.00) - (crSize.Height);
// break;
// case "WM_BOTTOM_LEFT":
// xpos = (crSize.Width / 2);
// ypos = ((float)bitmap.Height * (float)1.00) - crSize.Height;
// break;
// case "WM_CENTER":
// xpos = ((float)bitmap.Width * (float).50);
// ypos = ((float)bitmap.Height * (float).50) - (crSize.Height / 2);
// break;
//}
//StringFormat strFormat = new StringFormat();
//strFormat.Alignment = StringAlignment.Center;
//SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
//picture.DrawString(watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, strFormat);
//SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, ColorTranslator.FromHtml(fontColor)));
//picture.DrawString(watermarkText, crFont, semiTransBrush, xpos, ypos, strFormat);
//try
//{
// //以xxx格式保存缩略+水印图
// bitmap.Save(thumbnailPath, imageFormat);
//}
//finally
//{
// semiTransBrush2.Dispose();
// semiTransBrush.Dispose();
// bitmap.Dispose();
// picture.Dispose();
//}
string tempPath = "/Upload/Temp/" + new Guid() + ".jpg";
addWatermarkText(originalImagePath, HttpContext.Current.Server.MapPath(tempPath), watermarkText, watermarkPosition, fontFamily, fontSize, fontColor, interpolationMode, smoothingMode);
MakeThumbnail(HttpContext.Current.Server.MapPath(tempPath), thumbnailPath, width, height, mode);
//}
}
/// <summary>
/// 获取缩略图对象
/// </summary>
/// <param name="originalImage">源图对象</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="graphics">输出绘图对象, 可继续追加水印</param>
/// <param name="interpolationMode">指定在缩放或旋转图像时使用的算法</param>
/// <param name="smoothingMode">指定是否将平滑处理（抗锯齿）应用于直线、曲线和已填充区域的边缘</param>
/// <remarks>当原图尺寸小于指定缩略尺寸时, 不进行缩略, 直接输出原图, 并且不更改尺寸.</remarks>
public static Bitmap GetThumbnail(Image originalImage, int width, int height,
MakeThumbnailMode mode, out Graphics graphics,
//DONE: 由外部设置缩略图的清晰度, 拟减少文件大小 BEN ADD 20130123 22:41
//TODO: 参数太多, 用对象封装, 拟减少调用的痛苦程度 BEN ADD 20130124 16:40
InterpolationMode interpolationMode = InterpolationMode.High,
SmoothingMode smoothingMode = SmoothingMode.HighQuality)
{
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
//TODO: Auto目前按照容器宽度进行等比例判断, 这是错误的, 应该根据原图的宽高比进行判断
if (mode == MakeThumbnailMode.Auto)
{
if (towidth > toheight)
{
mode = MakeThumbnailMode.W;
}
else
{
mode = MakeThumbnailMode.H;
}
}
//当原图尺寸小于指定缩略尺寸时, 不进行缩略, 直接输出原图, 并且不更改尺寸.
if (ow < towidth && oh < toheight)
{
towidth = ow;
toheight = oh;
}
else
{
switch (mode)
{
case MakeThumbnailMode.HW: //指定高宽缩放（可能变形）
break;
case MakeThumbnailMode.W: //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case MakeThumbnailMode.H: //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case MakeThumbnailMode.Cut: //指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height >
(double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
}
//新建一个bmp图片
Bitmap bitmap = new System.Drawing.Bitmap(towidth, toheight);
bitmap.MakeTransparent(Color.Transparent);
//新建一个画板
graphics = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
graphics.InterpolationMode = interpolationMode;
//设置高质量,低速度呈现平滑程度
graphics.SmoothingMode = smoothingMode;
//清空画布并以透明背景色填充
graphics.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
graphics.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
return(bitmap);
}
public static bool SmallPic(string originalImagePath, string thumbnailPath, int width, int height, int targetRate, MakeThumbnailMode mode, ref byte[] retBytes, ImageFormat format)
{
Bitmap bitmap;
Bitmap bitmap2;
System.Drawing.Image image = System.Drawing.Image.FromFile(originalImagePath);
int num = width;
int num2 = height;
int num3 = 0;
int num4 = 0;
int num5 = image.Width;
int num6 = image.Height;
if (((num > num5) || (num2 > num6)) && ((mode == MakeThumbnailMode.Width) || (mode == MakeThumbnailMode.Height)))
{
num = num5;
num2 = num6;
mode = MakeThumbnailMode.Solid;
}
switch (mode)
{
case MakeThumbnailMode.Liquid:
if ((((double)image.Width) / ((double)image.Height)) > (((double)num) / ((double)num2)))
{
num2 = (num * image.Height) / image.Width;
}
else
{
num = (num2 * image.Width) / image.Height;
}
break;
case MakeThumbnailMode.Width:
num2 = (image.Height * width) / image.Width;
break;
case MakeThumbnailMode.Height:
num = (image.Width * height) / image.Height;
break;
case MakeThumbnailMode.Cut:
if ((((double)image.Width) / ((double)image.Height)) >= (((double)num) / ((double)num2)))
{
num5 = (num6 * num) / num2;
num4 = 0;
num3 = (image.Width - num5) / 2;
break;
}
num6 = (num5 * num2) / num;
num3 = 0;
num4 = (image.Height - num6) / 2;
break;
case MakeThumbnailMode.Part:
if ((((double)image.Width) / ((double)image.Height)) <= (((double)num) / ((double)num2)))
{
num6 = num2;
num5 = (num6 * image.Width) / image.Height;
num4 = 0;
num3 = (num - num5) / 2;
break;
}
num5 = num;
num6 = (num5 * image.Height) / image.Width;
num3 = 0;
num4 = (num2 - num6) / 2;
break;
case MakeThumbnailMode.Contain:
if ((((double)image.Width) / ((double)image.Height)) <= (((double)num) / ((double)num2)))
{
num5 = (image.Height * num) / num2;
num4 = 0;
num3 = (image.Width - num5) / 2;
break;
}
num6 = (image.Width * num2) / num;
num3 = 0;
num4 = (image.Height - num6) / 2;
break;
case MakeThumbnailMode.Rate:
height = (image.Height * targetRate) / 100;
width = (image.Width * targetRate) / 100;
num = (image.Width * height) / image.Height;
num2 = (image.Height * width) / image.Width;
break;
}
try
{
bitmap = new Bitmap(originalImagePath);
bitmap2 = new Bitmap(bitmap, num, num2);
if (!string.IsNullOrEmpty(thumbnailPath))
{
bitmap2.Save(thumbnailPath);
}
MemoryStream stream = new MemoryStream();
bitmap2.Save(stream, format);
retBytes = stream.GetBuffer();
stream.Close();
bitmap.Dispose();
bitmap2.Dispose();
}
catch (Exception exception)
{
if (image != null)
{
image.Dispose();
}
bitmap = null;
bitmap2 = null;
throw exception;
}
finally
{
image.Dispose();
bitmap = null;
bitmap2 = null;
}
return(true);
}
public static bool MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, int targetRate, MakeThumbnailMode mode, ref byte[] retBytes)
{
System.Drawing.Image image = System.Drawing.Image.FromFile(originalImagePath);
int num = width;
int num2 = height;
int x = 0;
int y = 0;
int num5 = image.Width;
int num6 = image.Height;
if (((num > num5) || (num2 > num6)) && ((mode == MakeThumbnailMode.Width) || (mode == MakeThumbnailMode.Height)))
{
num = num5;
num2 = num6;
mode = MakeThumbnailMode.Solid;
}
switch (mode)
{
case MakeThumbnailMode.Liquid:
if ((((double)image.Width) / ((double)image.Height)) > (((double)num) / ((double)num2)))
{
num2 = (num * image.Height) / image.Width;
}
else
{
num = (num2 * image.Width) / image.Height;
}
break;
case MakeThumbnailMode.Width:
num2 = (image.Height * width) / image.Width;
break;
case MakeThumbnailMode.Height:
num = (image.Width * height) / image.Height;
break;
case MakeThumbnailMode.Cut:
if ((((double)image.Width) / ((double)image.Height)) >= (((double)num) / ((double)num2)))
{
num5 = (num6 * num) / num2;
y = 0;
x = (image.Width - num5) / 2;
break;
}
num6 = (num5 * num2) / num;
x = 0;
y = (image.Height - num6) / 2;
break;
case MakeThumbnailMode.Part:
if ((((double)image.Width) / ((double)image.Height)) <= (((double)num) / ((double)num2)))
{
num6 = num2;
num5 = (num6 * image.Width) / image.Height;
y = 0;
x = (num - num5) / 2;
break;
}
num5 = num;
num6 = (num5 * image.Height) / image.Width;
x = 0;
y = (num2 - num6) / 2;
break;
case MakeThumbnailMode.Contain:
if ((((double)image.Width) / ((double)image.Height)) <= (((double)num) / ((double)num2)))
{
num6 = image.Height;
num5 = (num6 * num) / num2;
y = 0;
x = (image.Width - num5) / 2;
break;
}
num5 = image.Width;
num6 = (num5 * num2) / num;
x = 0;
y = (image.Height - num6) / 2;
break;
case MakeThumbnailMode.Rate:
height = (image.Height * targetRate) / 100;
width = (image.Width * targetRate) / 100;
num = (image.Width * height) / image.Height;
num2 = (image.Height * width) / image.Width;
break;
}
System.Drawing.Image image2 = new Bitmap(num, num2);
Graphics graphics = Graphics.FromImage(image2);
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.Clear(Color.Transparent);
graphics.DrawImage(image, new Rectangle(0, 0, num, num2), new Rectangle(x, y, num5, num6), GraphicsUnit.Pixel);
try
{
if (!string.IsNullOrEmpty(thumbnailPath))
{
image2.Save(thumbnailPath, ImageFormat.Jpeg);
}
MemoryStream stream = new MemoryStream();
image2.Save(stream, ImageFormat.Jpeg);
retBytes = stream.GetBuffer();
stream.Close();
}
catch (Exception exception)
{
throw exception;
}
finally
{
image.Dispose();
image2.Dispose();
graphics.Dispose();
}
return(true);
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, MakeThumbnailMode mode)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
switch (mode)
{
case MakeThumbnailMode.指定高宽缩放可能变形: //指定高宽缩放（可能变形）
break;
case MakeThumbnailMode.指定宽然后高按比例: //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case MakeThumbnailMode.指定高然后宽按比例: //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case MakeThumbnailMode.指定高宽裁减不变形: //指定高宽裁减（不变形）
if (originalImage.Width / (double)originalImage.Height > towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
}
//新建一个bmp图片
Image bitmap = new Bitmap(towidth, toheight);
//新建一个画板
Graphics g = Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = InterpolationMode.High;
//设置高质量,低速度呈现平滑程度
g.SmoothingMode = SmoothingMode.HighQuality;
//清空画布并以透明背景色填充
g.Clear(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);
try
{
//以指定格式保存缩略图
bitmap.Save(thumbnailPath, originalImage.RawFormat);
}
catch (Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="imageFormat">缩略图保存格式</param>
/// <remarks>当原图尺寸小于指定缩略尺寸时, 不进行缩略, 直接输出原图, 并且不更改尺寸.</remarks>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode, System.Drawing.Imaging.ImageFormat imageFormat)
{
Image originalImage = Image.FromFile(originalImagePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = originalImage.Width;
int oh = originalImage.Height;
if (mode == MakeThumbnailMode.Auto)
{
if (ow > oh)
{
mode = MakeThumbnailMode.W;
}
else
{
mode = MakeThumbnailMode.H;
}
}
//当原图尺寸小于指定缩略尺寸时, 不进行缩略, 直接输出原图, 并且不更改尺寸.
if (ow < towidth && oh < toheight)
{
try
{
//以xxx格式保存缩略图
originalImage.Save(thumbnailPath, imageFormat);
}
catch (Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
}
return;
}
switch (mode)
{
case MakeThumbnailMode.HW: //指定高宽缩放（可能变形）
break;
case MakeThumbnailMode.W: //指定宽，高按比例
toheight = originalImage.Height * width / originalImage.Width;
break;
case MakeThumbnailMode.H: //指定高，宽按比例
towidth = originalImage.Width * height / originalImage.Height;
break;
case MakeThumbnailMode.Cut: //指定高宽裁减（不变形）
if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)
{
oh = originalImage.Height;
ow = originalImage.Height * towidth / toheight;
y = 0;
x = (originalImage.Width - ow) / 2;
}
else
{
ow = originalImage.Width;
oh = originalImage.Width * height / towidth;
x = 0;
y = (originalImage.Height - oh) / 2;
}
break;
default:
break;
}
//新建一个bmp图片
using (Bitmap bitmap = new System.Drawing.Bitmap(towidth, toheight))
{
bitmap.MakeTransparent(Color.Transparent);
//新建一个画板
Graphics g = System.Drawing.Graphics.FromImage(bitmap);
//设置高质量插值法
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
//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(Color.Transparent);
//在指定位置并且按指定大小绘制原图片的指定部分
g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),
new Rectangle(x, y, ow, oh),
GraphicsUnit.Pixel);
try
{
//以xxx格式保存缩略图
bitmap.Save(thumbnailPath, imageFormat);
}
catch (Exception e)
{
throw e;
}
finally
{
originalImage.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="originalImagePath">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="width">缩略图宽度</param>
/// <param name="height">缩略图高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <remarks>缩略图默认png格式</remarks>
public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height,
MakeThumbnailMode mode)
{
MakeThumbnail(originalImagePath, thumbnailPath, width, height, mode, System.Drawing.Imaging.ImageFormat.Png);
}
public UploadImageHandlerBase(MakeThumbnailMode mode = MakeThumbnailMode.None, bool isLocalSave = true, ApplicationKeyType applicationKeyType = ApplicationKeyType.None)
: base(isLocalSave, applicationKeyType)
{
ThumbnailMode = mode == MakeThumbnailMode.None ? MakeThumbnailMode.W : mode;
}