static int Main(string[] args)
{
if (args.Length is < 1 or > 2)
{
Console.Error.WriteLine("Usage: webp-to-jpeg <input> [output]");
return(1);
}
try
{
var inputFileName = args[0];
var outputFileName = args.Length > 1
? args[1]
: Path.ChangeExtension(inputFileName, ".jpg");
WebPExecuteDownloader.Download();
var builder = new WebPDecoderBuilder();
var decoder = builder.Build();
using var output = File.Create(outputFileName);
using var input = File.OpenRead(inputFileName);
decoder.Decode(input, output);
}
catch (Exception exception)
{
Console.Error.WriteLine($"Exception: {exception.Message}");
return(1);
}
return(0);
}
public void Compress(IServiceProvider serviceProvider, string srcFile, string dstFile)
{
var loggerFactory = (ILoggerFactory)serviceProvider.GetService(typeof(ILoggerFactory));
var logger = loggerFactory.CreateLogger("ImageToWebp");
string tempfile = null;
var path = Path.Combine(Path.GetFullPath("."), "webp");
//根据当前系统平台下载google压缩工具
if (Directory.Exists(path) == false)
{
logger.LogInformation("begin WebPExecuteDownloader.Download");
WebPExecuteDownloader.Download();
logger.LogInformation("end WebPExecuteDownloader.Download");
}
var builder = new WebPEncoderBuilder();
var encoder = builder
.AlphaConfig(x => x // 透明处理
.TransparentProcess(
TransparentProcesses.Exact
)
)
.Build();
var ext = Path.GetExtension(srcFile);
if (string.Equals(ext, ".gif", StringComparison.CurrentCultureIgnoreCase))
{
//gif需要更改工具名称
var type = encoder.GetType();
var fieldInfo = type.GetField("_executeFilePath", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
var _executeFilePath = (string)fieldInfo.GetValue(encoder).ToString().Replace("cwebp", "gif2webp");
fieldInfo.SetValue(encoder, _executeFilePath);
fieldInfo = type.GetField("_arguments", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
fieldInfo.SetValue(encoder, "-q 70");
}
while (true)
{
try
{
logger.LogInformation("build webp for " + dstFile);
using (var outputFile = File.Open(dstFile, FileMode.Create))
using (var inputFile = File.Open(srcFile, FileMode.Open))
{
encoder.Encode(inputFile, outputFile);
}
if (tempfile != null)
{
try
{
File.Delete(tempfile);
}
catch { }
}
break;
}
catch (Exception ex)
{
logger.LogError(ex.ToString());
if (tempfile != null)
{
try
{
File.Delete(tempfile);
}
catch { }
tempfile = null;
}
if (ex.Message.Contains("16383"))
{
//图像太大，把分辨率转小
using (var bitmap = Bitmap.FromFile(srcFile))
{
int newwidth = bitmap.Size.Width;
int newheight = bitmap.Size.Height;
if (newwidth > 16383)
{
newheight = (int)(newheight * (16383.0 / newwidth));
newwidth = 16383;
}
if (newheight > 16383)
{
newwidth = (int)(newwidth * (16383.0 / newheight));
newheight = 16383;
}
using (var newbitmap = new Bitmap(newwidth, newheight, bitmap.PixelFormat))
{
using (Graphics g = Graphics.FromImage(newbitmap))
{
g.DrawImage(bitmap, new Rectangle(0, 0, newwidth, newheight), new Rectangle(Point.Empty, bitmap.Size), GraphicsUnit.Pixel);
}
var rawformat = bitmap.RawFormat;
bitmap.Dispose();
tempfile = dstFile + ".tmp.png";
while (System.IO.File.Exists(tempfile))
{
tempfile = dstFile + DateTime.Now.ToString("yyyyMMddHHmmss") + ".tmp.png";
}
srcFile = tempfile;
newbitmap.Save(tempfile, rawformat);
}
}
}
else
{
break;
}
}
}
}
public WebPExecuteDownloadHelper()
{
WebPExecuteDownloader.Download();
}
