private static byte[] ReprocessPngFile(byte[] png, ParseContext context, CommandLineOptions opts)
{
var tempFilePath = Path.Combine(Path.GetTempPath(), "IcoCrush" + Guid.NewGuid().ToString("N") + ".png");
File.WriteAllBytes(tempFilePath, png);
var tokens = opts.PngToolPath.Split(' ').ToList();
var exe = tokens[0];
tokens.RemoveAt(0);
tokens.Add(tempFilePath);
var info = new ProcessStartInfo
{
FileName = exe,
Arguments = string.Join(' ', tokens),
WindowStyle = ProcessWindowStyle.Hidden,
};
System.Console.WriteLine(info.FileName);
System.Console.WriteLine(info.Arguments);
using (var process = Process.Start(info))
{
process.WaitForExit();
if (process.ExitCode != 0)
{
throw new Exception($"PNG process returned error code {process.ExitCode}. Process: {info.FileName} {info.Arguments}");
}
}
var result = File.ReadAllBytes(tempFilePath);
File.Delete(tempFilePath);
var outputEncoding = PngDecoder.GetPngFileEncoding(new Memory <byte>(result));
if (outputEncoding.ColorType != PngColorType.RGBA)
{
System.Console.WriteLine($"Warning: After running the PNG through the external tool, the color type is: {outputEncoding.ColorType}. ICO files require color type RGBA for embedded PNGs.");
}
else if (outputEncoding.BitsPerChannel != 8)
{
System.Console.WriteLine($"Warning: After running the PNG through the external tool, the color depth is: {outputEncoding.BitsPerChannel * 4}-bit. ICO files require 32-bit color depth for embedded PNGs.");
}
return(result);
}
private static void ReadPngFile(CommandLineOptions opts, ParseContext context, IcoFrame frame, byte[] sourceFile, out bool canSourceBePreserved)
{
using (var stream = new MemoryStream(sourceFile))
{
var decoder = new SixLabors.ImageSharp.Formats.Png.PngDecoder();
frame.CookedData = decoder.Decode <Rgba32>(new Configuration(), stream);
}
var encoding = PngDecoder.GetPngFileEncoding(new Memory <byte>(sourceFile));
frame.Encoding.Type = IcoEncodingType.Png;
frame.Encoding.ClaimedBitDepth = 32;
frame.Encoding.ActualBitDepth = 32;
canSourceBePreserved = encoding.ColorType == PngColorType.RGBA && encoding.BitsPerChannel == 8;
}