public void DecodePngImageTest()
{
using (Stream stream = File.OpenRead("screenshot.png"))
using (PngDecoder decoder = new PngDecoder(stream))
{
Assert.Equal(8, decoder.BitDepth);
Assert.Equal(0x00214800, decoder.DecompressedSize);
Assert.Equal(0x780, decoder.BytesPerRow);
Assert.Equal(3, decoder.Channels);
Assert.Equal(PngColorType.RGB, decoder.ColorType);
Assert.Equal(1136, decoder.Height);
Assert.Equal(stream, decoder.Stream);
// The revision can differ, e.g. 1.16.34 on Windows and 1.16.20 on Ubuntu Xenial, so don't check the
// entire string.
Assert.NotNull(decoder.Version);
var version = new Version(decoder.Version);
Assert.Equal(1, version.Major);
Assert.Equal(640, decoder.Width);
byte[] data = new byte[decoder.DecompressedSize];
decoder.TransformSetBgr();
decoder.Decode(data);
SHA1 hasher = SHA1.Create();
var hash = hasher.ComputeHash(data);
var hashString = string.Join("", hash.Select(c => c.ToString("x2")));
Assert.Equal(2181120, data.Length);
Assert.Equal("43e046fbb27bfc352c6007247380966dc92f25e0", hashString);
}
}
public static byte[] DecompressImage()
{
byte[] buffer = new byte[BufferSize];
using (Stream stream = File.OpenRead(FileName))
{
for (int i = 0; i < N; i++)
{
stream.Position = 0;
PngDecoder png = new PngDecoder(stream);
png.TransformSetBgr();
png.Decode(buffer);
}
}
return(buffer);
}