private static BitmapV5Header FillBitmapHeader(BinaryReader rdr, DibClass cls)
{
// I'm assuming that BitmapCore bitmaps use RGB encoding without compression
var v5 = new BitmapV5Header {
bV5Compression = BiCompression.BiRgb
};
var isCore = cls == DibClass.Core;
v5.bV5Size = rdr.ReadUInt32();
v5.bV5Width = isCore ? rdr.ReadUInt16() : rdr.ReadInt32();
v5.bV5Height = isCore ? rdr.ReadUInt16() : rdr.ReadInt32();
v5.bV5Planes = rdr.ReadUInt16();
v5.bV5BitCount = rdr.ReadUInt16();
if (cls == DibClass.Core)
{
return(v5);
}
v5.bV5Compression = (BiCompression)rdr.ReadUInt32();
v5.bV5SizeImage = rdr.ReadUInt32();
v5.bV5XPelsPerMeter = rdr.ReadInt32();
v5.bV5YPelsPerMeter = rdr.ReadInt32();
v5.bV5ClrUsed = rdr.ReadUInt32();
v5.bV5ClrImportant = rdr.ReadUInt32();
if (cls == DibClass.V3)
{
return(v5);
}
v5.bV5RedMask = rdr.ReadUInt32();
v5.bV5GreenMask = rdr.ReadUInt32();
v5.bV5BlueMask = rdr.ReadUInt32();
v5.bV5AlphaMask = rdr.ReadUInt32();
v5.bV5CSType = rdr.ReadUInt32();
v5.bV5Endpoints = new CieXyzTriple(rdr);
v5.bV5GammaRed = rdr.ReadUInt32();
v5.bV5GammaGreen = rdr.ReadUInt32();
v5.bV5GammaBlue = rdr.ReadUInt32();
if (cls == DibClass.V4)
{
return(v5);
}
v5.bV5Intent = rdr.ReadUInt32();
v5.bV5ProfileData = rdr.ReadUInt32();
v5.bV5ProfileSize = rdr.ReadUInt32();
v5.bV5Reserved = rdr.ReadUInt32();
return(v5);
}
/// <summary>Reads header information from a stream.</summary>
private void Initialise(Stream stream)
{
BinaryReader rdr;
int first;
try
{
rdr = new BinaryReader(stream);
first = rdr.PeekChar();
}
catch (ArgumentException aex) { throw new DibException("Unable to initialise DIB", aex); }
// see if it has a BitmapFileHeader at the beginning
if (first == 'B')
{
_fileHeader = new BitmapFileHeader(rdr);
}
// determine the Dib type (the BitmapFileHeader will have advanced the reader)
// maybe do some validation on the structs?
switch (rdr.PeekChar())
{
case 12:
Class = DibClass.Core;
break;
case 40:
Class = DibClass.V3;
break;
case 108:
Class = DibClass.V4;
break;
case 124:
Class = DibClass.V5;
break;
default:
throw new DibException("Unrecognised BitmapInfoHeader dwSize");
}
_infoHeader = FillBitmapHeader(rdr, Class);
if (_fileHeader.bfType == 0)
{
// if no fileheader was read earlier
// create the FileHeader
_fileHeader = CreateFileHeader();
}
else
{
// resize the data array to remove the fileheader
var sizeOfBitmapFileHeader = Marshal.SizeOf(typeof(BitmapFileHeader));
var newData = new byte[_dibData.Length - sizeOfBitmapFileHeader];
Array.Copy(_dibData, sizeOfBitmapFileHeader, newData, 0, newData.Length);
_dibData = newData;
}
}
