/// <summary>
/// 通过指定的 CompressOption 实例执行单个文件压缩
/// </summary>
/// <param name="option"></param>
/// <exception cref="NotSupportedException">Image.FromFile 引发的 OutOfMemoryException</exception>
/// <exception cref="FileNotFoundException"></exception>
/// <exception cref="System.ArgumentException"></exception>
public static void CompressSingle(string filename, string outputPath, ICompressOption option)
{
Image img;
try
{
img = Image.FromFile(filename);
}
/* OutOfMemoryException
* The file does not have a valid image format.
* -or-
* GDI+ does not support the pixel format of the file.
* --MSDN : https://docs.microsoft.com/en-us/dotnet/api/system.drawing.image.fromfile?view=dotnet-plat-ext-3.1
*/
catch (OutOfMemoryException e)
{
throw new NotSupportedException("Not Supported file format or out of memory.(Mostly the former)", e);
}
var output = new Bitmap(img.Size.Width, img.Size.Height);
Graphics g = Graphics.FromImage(output);
g.DrawImage(img, new Rectangle(0, 0, img.Size.Width, img.Size.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel);
g.Dispose();
img.Dispose();
var codec = GetCodecInfo(ImageFormat.Jpeg);
var eps = GetQualityEncoderParameters(option.Quality);
var realPath = outputPath.IsDirectory() ?
Path.Combine(outputPath, Path.GetFileNameWithoutExtension(filename)) + ".jpg"
: outputPath;//outputPath could be either a directory or a file path.
output.Save(realPath, codec, eps);
output.Dispose();
}
public static CompressOption FromInterface(ICompressOption iOption) => (CompressOption)iOption;
