/// <summary>
/// 使用System.Drawing.Image创建WPF使用的ImageSource类型缩略图（不放大小图）
/// </summary>
/// <param name="sourceImage">System.Drawing.Image 对象</param>
/// <param name="width">指定宽度</param>
/// <param name="height">指定高度</param>
public static ImageSource CreateImageSourceThumbnia(System.Drawing.Image sourceImage, double width, double height)
{
if (sourceImage == null)
{
return(null);
}
double rw = width / sourceImage.Width;
double rh = height / sourceImage.Height;
var aspect = (float)Math.Min(rw, rh);
int w = sourceImage.Width, h = sourceImage.Height;
if (aspect < 1)
{
w = (int)Math.Round(sourceImage.Width * aspect); h = (int)Math.Round(sourceImage.Height * aspect);
}
Bitmap sourceBmp = new Bitmap(sourceImage, w, h);
IntPtr hBitmap = sourceBmp.GetHbitmap();
BitmapSource bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
if (!bitmapSource.IsFrozen && bitmapSource.CanFreeze)
{
bitmapSource.Freeze();
}
Win32Helper.DeleteObject(hBitmap);
sourceImage.Dispose();
sourceBmp.Dispose();
return(bitmapSource);
}
/// <summary>
/// 从一个Bitmap创建ImageSource
/// </summary>
/// <param name="image">Bitmap对象</param>
/// <returns></returns>
public static ImageSource CreateImageSourceFromImage(Bitmap image)
{
if (image == null)
{
return(null);
}
try
{
IntPtr ptr = image.GetHbitmap();
BitmapSource bs = Imaging.CreateBitmapSourceFromHBitmap(ptr, IntPtr.Zero, Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions());
if (!bs.IsFrozen && bs.CanFreeze)
{
bs.Freeze();
}
image.Dispose();
Win32Helper.DeleteObject(ptr);
return(bs);
}
catch (Exception)
{
return(null);
}
}
