/// <summary>
/// 重新调整图片的尺寸
/// </summary>
/// <param name="imageStream">源图片流</param>
/// <param name="maxSize">最大尺寸</param>
/// <param name="isSameRate">是否保存相同比率</param>
/// <returns></returns>
public static byte[] Resize(Stream imageStream, ImageSize maxSize, bool isSameRate = false)
{
using (SKManagedStream managedStream = new SKManagedStream(imageStream)) //包装流
{
using (SKBitmap bitmap = SKBitmap.Decode(managedStream)) // 将流加载到图片中
{
if (bitmap == null)
{
throw new ImageException("传递的参数不是有效图片");
}
ImageSize sourceSize = new ImageSize(bitmap.Width, bitmap.Height);
ImageSize newSize = maxSize;
if (isSameRate)
{
newSize = ImageSize.GetSameRateSize(sourceSize, maxSize);
}
using (SKBitmap newBitmap = bitmap.Resize(new SKImageInfo(newSize.Width, newSize.Height), SKFilterQuality.High))
{
if (newBitmap == null)
{
throw new ImageException("调整图片尺寸失败");
}
using (SKImage image = SKImage.FromBitmap(newBitmap))
{
using (SKData p = image.Encode(SKEncodedImageFormat.Jpeg, 100))
{
return(p.ToArray());
}
}
}
}
}
}