private static bool ReadTGAInfo(byte[] WorkPtr, out STargaHeader TargaHeader)
{
TargaHeader.PostHeaderSkip = WorkPtr[0];
TargaHeader.ColorMapType = WorkPtr[1];
TargaHeader.ImageType = WorkPtr[2];
TargaHeader.ColorMapStart = BitConverter.ToUInt16(WorkPtr, 3);
TargaHeader.ColorMapLength = BitConverter.ToUInt16(WorkPtr, 5);
TargaHeader.ColorMapBits = WorkPtr[7];
TargaHeader.XStart = BitConverter.ToUInt16(WorkPtr, 8);
TargaHeader.YStart = BitConverter.ToUInt16(WorkPtr, 10);
TargaHeader.Width = BitConverter.ToUInt16(WorkPtr, 12);
TargaHeader.Height = BitConverter.ToUInt16(WorkPtr, 14);
TargaHeader.BPP = WorkPtr[16];
TargaHeader.Descriptor = WorkPtr[17];
// check the header
if (TargaHeader.ColorMapType != 0 || // 0 = RGB, 1 = Palette
// 1 = Palette, 2 = RGB, 3 = mono, 9 = RLE Palette, 10 = RLE RGB, 11 RLE mono
(TargaHeader.ImageType != 2 && TargaHeader.ImageType != 10 && TargaHeader.ImageType != 9) ||
(TargaHeader.BPP != 24 && TargaHeader.BPP != 32))
{
#if DEBUG
throw new NotImplementedException("Unsupported TGA mode");
#endif
#if ASSERTS_ENABLED
if (((byte *)pTargaHeader)[0] == 'B' && ((byte *)pTargaHeader)[1] == 'M')
{
assert(!"This TGA's header looks like a BMP!"); // look at the first two bytes and see if they are 'BM'
// if so it's a BMP not a TGA
}
else
{
byte *pColorMapType = NULL;
switch (TargaHeader.ColorMapType)
{
case 0:
pColorMapType = "RGB Color Map";
break;
case 1:
pColorMapType = "Palette Color Map";
break;
default:
pColorMapType = "<Illegal Color Map>";
break;
}
byte *pImageType = NULL;
switch (TargaHeader.ImageType)
{
case 1:
pImageType = "Palette Image Type";
break;
case 2:
pImageType = "RGB Image Type";
break;
case 3:
pImageType = "mono Image Type";
break;
case 9:
pImageType = "RLE Palette Image Type";
break;
case 10:
pImageType = "RLE RGB Image Type";
break;
case 11:
pImageType = "RLE mono Image Type";
break;
default:
pImageType = "<Illegal Image Type>";
break;
}
int ColorDepth = TargaHeader.BPP;
CJString ErrorString;
ErrorString.Format("Image type %s %s (%u bpp) not supported!", pColorMapType, pImageType, ColorDepth);
ShowSystemMessage("TGA File IO Error", ErrorString.GetBytePtr(), "TGA Error");
}
#endif // ASSERTS_ENABLED
return(false);
}
return(true);
}
//*********************************************************************************************************************
static unsafe bool ReadTGAInfo(Byte *WorkPtr, out STargaHeader TargaHeader)
{
TargaHeader.PostHeaderSkip = WorkPtr[0];
TargaHeader.ColorMapType = WorkPtr[1];
TargaHeader.ImageType = WorkPtr[2];
TargaHeader.ColorMapStart = *((ushort *)(&WorkPtr[3]));
TargaHeader.ColorMapLength = *((ushort *)(&WorkPtr[5]));
TargaHeader.ColorMapBits = WorkPtr[7];
TargaHeader.XStart = *((ushort *)(&WorkPtr[8]));
TargaHeader.YStart = *((ushort *)(&WorkPtr[10]));
TargaHeader.Width = *((ushort *)(&WorkPtr[12]));
TargaHeader.Height = *((ushort *)(&WorkPtr[14]));
TargaHeader.BPP = WorkPtr[16];
TargaHeader.Descriptor = WorkPtr[17];
// check the header
if (TargaHeader.ColorMapType != 0 || // 0 = RGB, 1 = Palette
// 1 = Palette, 2 = RGB, 3 = mono, 9 = RLE Palette, 10 = RLE RGB, 11 RLE mono
(TargaHeader.ImageType != 2 && TargaHeader.ImageType != 10 && TargaHeader.ImageType != 9) ||
(TargaHeader.BPP != 24 && TargaHeader.BPP != 32))
{
#if ASSERTS_ENABLED
if (((Byte *)pTargaHeader)[0] == 'B' && ((Byte *)pTargaHeader)[1] == 'M')
{
assert(!"This TGA's header looks like a BMP!"); // look at the first two bytes and see if they are 'BM'
// if so it's a BMP not a TGA
}
else
{
Byte *pColorMapType = NULL;
switch (TargaHeader.ColorMapType)
{
case 0:
pColorMapType = "RGB Color Map";
break;
case 1:
pColorMapType = "Palette Color Map";
break;
default:
pColorMapType = "<Illegal Color Map>";
break;
}
Byte *pImageType = NULL;
switch (TargaHeader.ImageType)
{
case 1:
pImageType = "Palette Image Type";
break;
case 2:
pImageType = "RGB Image Type";
break;
case 3:
pImageType = "mono Image Type";
break;
case 9:
pImageType = "RLE Palette Image Type";
break;
case 10:
pImageType = "RLE RGB Image Type";
break;
case 11:
pImageType = "RLE mono Image Type";
break;
default:
pImageType = "<Illegal Image Type>";
break;
}
int ColorDepth = TargaHeader.BPP;
CJString ErrorString;
ErrorString.Format("Image type %s %s (%u bpp) not supported!", pColorMapType, pImageType, ColorDepth);
ShowSystemMessage("TGA File IO Error", ErrorString.GetBytePtr());
}
#endif // ASSERTS_ENABLED
return(false);
}
return(true);
}