/// <summary>
/// Creates a new instance of PngHeader
/// </summary>
public PngHeader(int width, int height)
{
_width = width;
_height = height;
_bitdepth = BitDepth.Eight;
_colortype = ColorType.TruecolorAlpha;
_interlaceMethod = InterlaceMethod.NoInterlacing;
}
public Ihdr(UInt32 width, UInt32 height, BitDepth bitDepth, ColorType colorType, CompressionMethod compressionMethod = CompressionMethod.Default, FilterMethod filterMethod = FilterMethod.Default, InterlaceMethod interlaceMethod = InterlaceMethod.None)
: base(ChunkType.IHDR)
{
#region Sanity
if(width == 0 || width > Int32.MaxValue)
throw new ArgumentOutOfRangeException("width", "width must be greater than 0 and smaller than In32.MaxValue(2^31-1)");
if(height == 0 || height > Int32.MaxValue)
throw new ArgumentOutOfRangeException("height", "height must be greater than 0 and smaller than In32.MaxValue(2^31-1)");
BitDepth[] allowedBitDepths;
switch (colorType)
{
case ColorType.Grayscale:
if(!(allowedBitDepths = new[] { BitDepth._1, BitDepth._2, BitDepth._4, BitDepth._8, BitDepth._16 }).Contains(bitDepth))
throw new ArgumentOutOfRangeException("bitDepth", String.Format("bitDepth must be one of {0} for colorType {1}", allowedBitDepths.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2)), colorType));
break;
case ColorType.Rgb:
if(!(allowedBitDepths = new[]{BitDepth._8, BitDepth._16}).Contains(bitDepth))
throw new ArgumentOutOfRangeException("bitDepth", String.Format("bitDepth must be one of {0} for colorType {1}", allowedBitDepths.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2)), colorType));
break;
case ColorType.Palette:
if(!(allowedBitDepths = new[] { BitDepth._1, BitDepth._2, BitDepth._4, BitDepth._8}).Contains(bitDepth))
throw new ArgumentOutOfRangeException("bitDepth", String.Format("bitDepth must be one of {0} for colorType {1}", allowedBitDepths.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2)), colorType));
break;
case ColorType.GrayscaleWithAlpha:
if(!(allowedBitDepths = new[] { BitDepth._8, BitDepth._16}).Contains(bitDepth))
throw new ArgumentOutOfRangeException("bitDepth", String.Format("bitDepth must be one of {0} for colorType {1}", allowedBitDepths.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2)), colorType));
break;
case ColorType.Rgba:
if(!(allowedBitDepths = new[] { BitDepth._8, BitDepth._16}).Contains(bitDepth))
throw new ArgumentOutOfRangeException("bitDepth", String.Format("bitDepth must be one of {0} for colorType {1}", allowedBitDepths.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2)), colorType));
break;
default:
throw new ArgumentOutOfRangeException("colorType", String.Format("Unknown colorType: {0}", colorType));
}
if(compressionMethod != CompressionMethod.Default)
throw new ArgumentOutOfRangeException("compressionMethod", String.Format("Unknown compressionMethod: {0}", compressionMethod));
if(filterMethod != FilterMethod.Default)
throw new ArgumentOutOfRangeException("filterMethod", String.Format("Unknown filterMethod: {0}", filterMethod));
var allowedInterlaceMethods = new[] {InterlaceMethod.None, InterlaceMethod.Adam7};
if(!allowedInterlaceMethods.Contains(interlaceMethod))
throw new ArgumentOutOfRangeException("interlaceMethod", String.Format("interlaceMethod must be one of {0}", allowedInterlaceMethods.Aggregate("", (s, bd) => s + bd + ", ", s => s.Trim().Substring(0, s.Length - 2))));
#endregion
Width = width;
Height = height;
BitDepth = bitDepth;
ColorType = colorType;
CompressionMethod = compressionMethod;
FilterMethod = filterMethod;
InterlaceMethod = interlaceMethod;
}
public override void Load(byte [] data)
{
Width = BitConverter.ToUInt32 (data, 0, false);
Height = BitConverter.ToUInt32 (data, 4, false);
Depth = data [8];
Color = (ColorType) data [9];
//if (Color != ColorType.Rgb)
// throw new System.Exception (System.String.Format ("unsupported {0}", Color));
this.Compression = (CompressionMethod) data [10];
if (this.Compression != CompressionMethod.Zlib)
throw new System.Exception (System.String.Format ("unsupported {0}", Compression));
Filter = (FilterMethod) data [11];
if (Filter != FilterMethod.Adaptive)
throw new System.Exception (System.String.Format ("unsupported {0}", Filter));
Interlace = (InterlaceMethod) data [12];
//if (Interlace != InterlaceMethod.None)
// throw new System.Exception (System.String.Format ("unsupported {0}", Interlace));
}
