/// <summary>
/// 生成缩略图并打水印再保存。
/// </summary>
/// <Param name="originalImageStream">Stream</Param>
/// <Param name="strFileName">源图路径（物理路径）</Param>
/// <Param name="thumbnailPath">缩略图路径（物理路径）</Param>
/// <Param name="maxWidth">缩略图最大宽度</Param>
/// <Param name="maxheight">缩略图最大高度</Param>
/// <Param name="mode">生成缩略图的方式</Param>
/// <Param name="waterPath">水印图路径（物理路径）</Param>
/// <Param name="edge">水印图离原图边界的距离</Param>
/// <Param name="position">加图片水印的位置</Param>
/// <returns>是否成功</returns>
public static bool MakeThumbnailWater(Stream originalImageStream, string strFileName, string thumbnailPath, int maxWidth, int maxheight, ThumbnailModeOption mode, string waterPath, int edge, WaterPositionOption position)
{
bool success = false;
try
{
// 生成缩略图
MakeThumbnail(originalImageStream, strFileName, thumbnailPath, maxWidth, maxheight, mode);
Stream stream = File.Open(thumbnailPath, FileMode.Open);
//打水印
MakeWaterImage(stream, strFileName, thumbnailPath, waterPath, edge, position);
success = true;
}
catch (Exception /*ex*/)
{
success = false;
throw;
}
return(success);
}
/// <summary>
/// 生成缩略图并打水印再保存。
/// </summary>
/// <param name="originalImageStream">Stream</param>
/// <param name="strFileName">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="maxWidth">缩略图最大宽度</param>
/// <param name="maxheight">缩略图最大高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <param name="waterPath">水印图路径（物理路径）</param>
/// <param name="edge">水印图离原图边界的距离</param>
/// <param name="position">加图片水印的位置</param>
/// <returns>是否成功</returns>
public static bool MakeThumbnailWater(Stream originalImageStream, string strFileName, string thumbnailPath, int maxWidth, int maxheight, ThumbnailModeOption mode, string waterPath, int edge, WaterPositionOption position)
{
bool success = false;
try
{
// 生成缩略图
MakeThumbnail(originalImageStream, strFileName, thumbnailPath, maxWidth, maxheight, mode);
Stream stream = File.Open(thumbnailPath, FileMode.Open);
//打水印
MakeWaterImage(stream, strFileName, thumbnailPath, waterPath, edge, position);
success = true;
}
catch (Exception ex)
{
success = false;
throw;
}
return success;
}
/// <summary>
/// 生成缩略图并保存。
/// </summary>
/// <Param name="originalImageStream">Stream</Param>
/// <Param name="strFileName">源图路径（物理路径）</Param>
/// <Param name="thumbnailPath">缩略图路径（物理路径）</Param>
/// <Param name="maxWidth">缩略图最大宽度</Param>
/// <Param name="maxheight">缩略图最大高度</Param>
/// <Param name="mode">生成缩略图的方式</Param>
/// <returns>是否成功</returns>
public static bool MakeThumbnail(Stream originalImageStream, string strFileName, string thumbnailPath, int maxWidth, int maxheight, ThumbnailModeOption mode)
{
bool success = false;
int x = 0;
int y = 0;
int toW = maxWidth;
int toH = maxheight;
Image image = null;
Image bitmap = null;
Graphics graphics = null;
try
{
image = Image.FromStream(originalImageStream);
int w = image.Width;
int h = image.Height;
switch (mode)
{
case ThumbnailModeOption.WH:
break;
case ThumbnailModeOption.W:
if (w < maxWidth)
{
toW = w;
toH = h;
}
else
{
toH = h * maxWidth / w;
}
break;
case ThumbnailModeOption.H:
if (h < maxheight)
{
toW = w;
toH = h;
}
else
{
toW = w * maxheight / h;
}
break;
case ThumbnailModeOption.CUT:
if (((double)w / (double)h) > ((double)toW / (double)toH))
{
w = h * toW / toH;
y = 0;
x = (image.Width - w) / 2;
}
else
{
h = w * toH / toW;
x = 0;
y = (image.Height - h) / 2;
}
break;
default:
goto case ThumbnailModeOption.CUT;
}
bitmap = new Bitmap(toW, toH);
graphics = Graphics.FromImage(bitmap);
graphics.InterpolationMode = InterpolationMode.High; //设置高质量,低速度呈现平滑程度
graphics.SmoothingMode = SmoothingMode.HighQuality; //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(image, new Rectangle(0, 0, toW, toH), new Rectangle(x, y, w, h), GraphicsUnit.Pixel);
// 保存缩略图
bitmap.Save(thumbnailPath, GetImageFormat(strFileName));
success = true;
}
catch (Exception /*ex*/)
{
success = false;
throw;
}
finally
{
if (graphics != null)
{
graphics.Dispose();
}
if (bitmap != null)
{
bitmap.Dispose();
}
if (image != null)
{
image.Dispose();
}
}
return(success);
}
/// <summary>
/// 生成缩略图并保存。
/// </summary>
/// <param name="originalImageStream">Stream</param>
/// <param name="strFileName">源图路径（物理路径）</param>
/// <param name="thumbnailPath">缩略图路径（物理路径）</param>
/// <param name="maxWidth">缩略图最大宽度</param>
/// <param name="maxheight">缩略图最大高度</param>
/// <param name="mode">生成缩略图的方式</param>
/// <returns>是否成功</returns>
public static bool MakeThumbnail(Stream originalImageStream, string strFileName, string thumbnailPath, int maxWidth, int maxheight, ThumbnailModeOption mode)
{
bool success = false;
int x = 0;
int y = 0;
int toW = maxWidth;
int toH = maxheight;
Image image = null;
Image bitmap = null;
Graphics graphics = null;
try
{
image = Image.FromStream(originalImageStream);
int w = image.Width;
int h = image.Height;
switch (mode)
{
case ThumbnailModeOption.WH:
break;
case ThumbnailModeOption.W:
if (w < maxWidth)
{
toW = w;
toH = h;
}
else
{
toH = h * maxWidth / w;
}
break;
case ThumbnailModeOption.H:
if (h < maxheight)
{
toW = w;
toH = h;
}
else
{
toW = w * maxheight / h;
}
break;
case ThumbnailModeOption.CUT:
if (((double)w / (double)h) > ((double)toW / (double)toH))
{
w = h * toW / toH;
y = 0;
x = (image.Width - w) / 2;
}
else
{
h = w * toH / toW;
x = 0;
y = (image.Height - h) / 2;
}
break;
default:
goto case ThumbnailModeOption.CUT;
}
bitmap = new Bitmap(toW, toH);
graphics = Graphics.FromImage(bitmap);
graphics.InterpolationMode = InterpolationMode.High; //设置高质量,低速度呈现平滑程度
graphics.SmoothingMode = SmoothingMode.HighQuality; //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(image, new Rectangle(0, 0, toW, toH), new Rectangle(x, y, w, h), GraphicsUnit.Pixel);
// 保存缩略图
bitmap.Save(thumbnailPath, GetImageFormat(strFileName));
success = true;
}
catch (Exception ex)
{
success = false;
throw;
}
finally
{
if (graphics != null) graphics.Dispose();
if (bitmap != null) bitmap.Dispose();
if (image != null) image.Dispose();
}
return success;
}
