/// <exception cref="PngProcessingException"/>
public PngHeader([NotNull] byte[] bytes)
{
if (bytes.Length != 13)
{
throw new PngProcessingException("PNG header chunk must have exactly 13 data bytes");
}
var reader = new SequentialByteArrayReader(bytes);
ImageWidth = reader.GetInt32();
ImageHeight = reader.GetInt32();
BitsPerSample = reader.GetByte();
var colorTypeNumber = reader.GetByte();
var colorType = PngColorType.FromNumericValue(colorTypeNumber);
if (colorType == null)
{
throw new PngProcessingException("Unexpected PNG color type: " + colorTypeNumber);
}
ColorType = colorType;
CompressionType = reader.GetByte();
FilterMethod = reader.GetByte();
InterlaceMethod = reader.GetByte();
}
public string GetColorTypeDescription()
{
if (!Directory.TryGetInt32(PngDirectory.TagColorType, out int value))
{
return(null);
}
return(PngColorType.FromNumericValue(value).Description);
}
/// <exception cref="PngProcessingException"/>
public PngHeader(byte[] bytes)
{
if (bytes.Length != 13)
{
throw new PngProcessingException("PNG header chunk must have exactly 13 data bytes");
}
var reader = new SequentialByteArrayReader(bytes);
ImageWidth = reader.GetInt32();
ImageHeight = reader.GetInt32();
BitsPerSample = reader.GetByte();
ColorType = PngColorType.FromNumericValue(reader.GetByte());
CompressionType = reader.GetByte();
FilterMethod = reader.GetByte();
InterlaceMethod = reader.GetByte();
}
