private void LoadBitmap(Stream stream)
{
ValidateStream(stream);
var reader = new BinaryReader(stream);
// Read the header.
_header = (TGA_HEADER)reader.ReadStruct(typeof(TGA_HEADER));
/*long t = stream.Position;
BinaryWriter wr = new BinaryWriter(stream, Encoding.ASCII);
if (!header.HasColorMap)
{
header.colormaplength = 0;
header.colormapstart = 0;
stream.Position = 0;
wr.WriteStruct(header);
}*/
// stream.Position = t;
if (_header.identsize > 0)
{
var imageId = reader.ReadBytes(_header.identsize);
Debug.WriteLine("Has ImageID: " + Encoding.ASCII.GetString(imageId));
}
// Check if we know the image data type.
if (!Enum.IsDefined(typeof(TgaPixelFormat), PixelFormat)) throw new Exception("Unknown image data type.");
// Check if color map is needed by data type and load it if available.
var colorMap = new byte[0];
if (PixelFormat == TgaPixelFormat.Indexed)
if (!HasPalette)
throw new Exception("No color map is defined.");
else
colorMap = reader.ReadBytes((PaletteBits / 8) * _header.colormaplength);
// Check if file has footer
var tempPos = stream.Position;
stream.Seek(-26, SeekOrigin.End);
var footer = (TGA_FOOTER)reader.ReadStruct(typeof(TGA_FOOTER));
stream.Position = tempPos;
_fileVersion = TgaFileVersion.Version1;
if (footer.IsValidFooter)
_fileVersion = TgaFileVersion.Version2;
_bitmap = null;
switch (_header.bits)
{
case 32:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
break;
case 24:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
break;
case 16:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format16bppRgb555);
break;
case 8:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
// Load palette from image data.
if (HasPalette && PixelFormat == TgaPixelFormat.Indexed)
{
var bytesPerColor = PaletteBits / 8;
for (var i = _header.colormapstart + bytesPerColor - 1; i < colorMap.Length; i += bytesPerColor)
{
var colorIndex = i/bytesPerColor;
if (colorIndex < _bitmap.Palette.Entries.Length)
_bitmap.Palette.Entries[colorIndex] = Color.FromArgb(colorMap[i], colorMap[i - 1], colorMap[i - 2]);
else
throw new Exception("Unexpected length of color palette.");
}
}
else if (PixelFormat == TgaPixelFormat.Greyscale)
{
// Build a 256 color palette of grey colors.
for (var i = 0; i < _bitmap.Palette.Entries.Length; i++)
_bitmap.Palette.Entries[i] = Color.FromArgb(i, i, i);
}
break;
}
if (_bitmap == null)
throw new NotSupportedException("The tga image format is not supported.");
ReadPixels(_bitmap,
Compressed
? new TruevisionRleReader(reader.BaseStream, _bitmap.PixelFormat)
: reader,
BottomToTop
);
if (_fileVersion == TgaFileVersion.Version2)
{
if (footer.developerDirectoryOffset > 0)
{
stream.Seek(footer.developerDirectoryOffset, SeekOrigin.Begin);
}
if (footer.extensionAreaOffset > 0)
{
//char[] trimChars = " \0".ToCharArray();
stream.Seek(footer.extensionAreaOffset, SeekOrigin.Begin);
var extension = (TGA_EXTENSION)reader.ReadStruct(typeof(TGA_EXTENSION));
// Debug.WriteLine("Generated by software: " + extension.softwareID + " v." + (float)extension.softwareVersionNumber / 100);
}
var bytesToPreserve = reader.ReadBytes((int)(stream.Length - 26 - stream.Position));
// Debug.WriteLine(System.Text.Encoding.ASCII.GetString(bytesToPreserve));
}
}
private void LoadBitmap(Stream stream)
{
ValidateStream(stream);
var reader = new BinaryReader(stream);
// Read the header.
_header = (TGA_HEADER)reader.ReadStruct(typeof(TGA_HEADER));
/*long t = stream.Position;
* BinaryWriter wr = new BinaryWriter(stream, Encoding.ASCII);
* if (!header.HasColorMap)
* {
* header.colormaplength = 0;
* header.colormapstart = 0;
* stream.Position = 0;
* wr.WriteStruct(header);
* }*/
// stream.Position = t;
if (_header.identsize > 0)
{
var imageId = reader.ReadBytes(_header.identsize);
Debug.WriteLine("Has ImageID: " + Encoding.ASCII.GetString(imageId));
}
// Check if we know the image data type.
if (!Enum.IsDefined(typeof(TgaPixelFormat), PixelFormat))
{
throw new Exception("Unknown image data type.");
}
// Check if color map is needed by data type and load it if available.
var colorMap = new byte[0];
if (PixelFormat == TgaPixelFormat.Indexed)
{
if (!HasPalette)
{
throw new Exception("No color map is defined.");
}
else
{
colorMap = reader.ReadBytes((PaletteBits / 8) * _header.colormaplength);
}
}
// Check if file has footer
var tempPos = stream.Position;
stream.Seek(-26, SeekOrigin.End);
var footer = (TGA_FOOTER)reader.ReadStruct(typeof(TGA_FOOTER));
stream.Position = tempPos;
_fileVersion = TgaFileVersion.Version1;
if (footer.IsValidFooter)
{
_fileVersion = TgaFileVersion.Version2;
}
_bitmap = null;
switch (_header.bits)
{
case 32:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
break;
case 24:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
break;
case 16:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format16bppRgb555);
break;
case 8:
_bitmap = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
// Load palette from image data.
if (HasPalette && PixelFormat == TgaPixelFormat.Indexed)
{
var bytesPerColor = PaletteBits / 8;
for (var i = _header.colormapstart + bytesPerColor - 1; i < colorMap.Length; i += bytesPerColor)
{
var colorIndex = i / bytesPerColor;
if (colorIndex < _bitmap.Palette.Entries.Length)
{
_bitmap.Palette.Entries[colorIndex] = Color.FromArgb(colorMap[i], colorMap[i - 1], colorMap[i - 2]);
}
else
{
throw new Exception("Unexpected length of color palette.");
}
}
}
else if (PixelFormat == TgaPixelFormat.Greyscale)
{
// Build a 256 color palette of grey colors.
for (var i = 0; i < _bitmap.Palette.Entries.Length; i++)
{
_bitmap.Palette.Entries[i] = Color.FromArgb(i, i, i);
}
}
break;
}
if (_bitmap == null)
{
throw new NotSupportedException("The tga image format is not supported.");
}
ReadPixels(_bitmap,
Compressed
? new TruevisionRleReader(reader.BaseStream, _bitmap.PixelFormat)
: reader,
BottomToTop
);
if (_fileVersion == TgaFileVersion.Version2)
{
if (footer.developerDirectoryOffset > 0)
{
stream.Seek(footer.developerDirectoryOffset, SeekOrigin.Begin);
}
if (footer.extensionAreaOffset > 0)
{
//char[] trimChars = " \0".ToCharArray();
stream.Seek(footer.extensionAreaOffset, SeekOrigin.Begin);
var extension = (TGA_EXTENSION)reader.ReadStruct(typeof(TGA_EXTENSION));
// Debug.WriteLine("Generated by software: " + extension.softwareID + " v." + (float)extension.softwareVersionNumber / 100);
}
var bytesToPreserve = reader.ReadBytes((int)(stream.Length - 26 - stream.Position));
// Debug.WriteLine(System.Text.Encoding.ASCII.GetString(bytesToPreserve));
}
}
