public System.IO.Stream Process(IImageProcessorSetting setting, System.IO.Stream imageStream)
{
ExceptionHelper.ThrowIfNull(imageStream, "imageStream");
if (!_Args.IsNeetProcess())
{
return(imageStream.Copy());
}
var image = Image.FromStream(imageStream);
var height = _Args.Height;
var width = _Args.Width;
if (_Args.Multiple.HasValue)
{
if (height.HasValue)
{
height = height.Value * _Args.Multiple.Value;
}
if (width.HasValue)
{
width = width.Value * _Args.Multiple.Value;
}
}
if (height.HasValue && width.HasValue)
{
var heightFirst = _Args.Edge == ZoomProcessArguments.EdgeEnum.Long
? image.Height >= image.Width
: image.Height <= image.Width;
if (heightFirst)
{
var e = (double)image.Height / (double)height.Value;
width = (int)((double)image.Width / e);
}
else
{
var e = (double)image.Width / (double)width.Value;
height = (int)((double)image.Height / e);
}
}
else
{
var e = (double)image.Height / (double)image.Width;
if (height.HasValue)
{
width = (int)((double)height.Value / e);
}
else if (width.HasValue)
{
height = (int)(width.Value * e);
}
}
var format = String.IsNullOrWhiteSpace(_Args.Format) ? ".jpg" : _Args.Format;
var mineType = Flh.IO.MimeTypeHelper.GetMimeType(format);
ExceptionHelper.ThrowIfTrue(!mineType.StartsWith("image/"), "_Args", "输出图片格式设置错误");
if (height.HasValue && width.HasValue && _Args.Large.HasValue && _Args.Large.Value)
{
if (height.Value > image.Height || width.Value > image.Width)
{
height = null;
width = null;
}
}
if (height.HasValue && width.HasValue)
{
using (var zoomImage = new Bitmap(width.Value, height.Value))
{
using (var graphics = Graphics.FromImage(zoomImage))
{
graphics.DrawImage(image, 0, 0, width.Value, height.Value);
return(GetQualityZoomStream(zoomImage, mineType, _Args.Quality, _Args.AbsoluteQuality));
}
}
}
else if (_Args.AbsoluteQuality.HasValue || _Args.Quality.HasValue)
{
return(GetQualityZoomStream(image, mineType, _Args.Quality, _Args.AbsoluteQuality));
}
else
{
var result = new System.IO.MemoryStream();
image.Save(result, GetImageFormatByMineType(mineType));
result.Position = 0;
return(result);
}
}