/// <summary>
/// 从XNA媒体库中取到图片.
/// 并且重新定义到目前大小.
/// </summary>
/// <param name="name">图片名称</param>
/// <returns>通过stream定义图片大小, jpeg格式.</returns>
public static Stream GetResizedImage(string name)
{
MediaLibrary mediaLibrary = new MediaLibrary();
PictureCollection pictureCollection = mediaLibrary.Pictures;
Picture picture = pictureCollection.Where(p => p.Name == name).FirstOrDefault();
if (picture == null)
{
throw new InvalidOperationException(string.Format("不能加载图片 {0}. 图片可能被删除", name));
}
Stream originalImageStream = picture.GetImage();
BitmapImage bmp = new BitmapImage();
bmp.SetSource(originalImageStream);
WriteableBitmap originalImage = new WriteableBitmap(bmp);
MemoryStream targetStream = new MemoryStream();
originalImage.SaveJpeg(targetStream, ResizedImageWidth, ResizedImageHeight, 0, 100);
// 现在图片被移到WriteableBitmap类, 原图片的stream被关闭.
originalImageStream.Close();
targetStream.Position = 0;
return(targetStream);
}
