/// <summary>
/// Convert the specified binary format into a font.
/// </summary>
/// <returns>The converted font.</returns>
/// <param name="source">Binary format.</param>
public GameFont Convert(BinaryFormat source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
var reader = new DataReader(source.Stream);
var font = new GameFont();
// Main header
reader.ReadUInt32(); // header size
reader.ReadBytes(4); // Size in memory of some sections
reader.ReadBytes(6); // Flags
var numGlyphs = reader.ReadUInt16();
font.CharWidth = reader.ReadUInt16();
font.CharHeight = reader.ReadUInt16();
reader.ReadUInt16(); // Pixels per glyph
reader.ReadUInt16(); // Depth (1: 4bpp)
reader.ReadBytes(8); // Padding
// Palette
var palette = new Colour[16];
for (int i = 0; i < palette.Length; i++)
{
palette[i] = new Colour(
reader.ReadByte(),
reader.ReadByte(),
reader.ReadByte());
reader.ReadByte(); // Alpha
}
font.SetPalette(palette);
// Variable Width Table (VWT)
int numGlyphInfo = reader.ReadInt32() / 2; // Size
var glyphs = new List <Glyph>(numGlyphs);
for (int i = 0; i < numGlyphs; i++)
{
var glyph = new Glyph();
// There is no information about chars but it seems they starts at 0x20
glyph.Char = (char)(i + 0x20);
// There may be not information for all the glyphs
if (i < numGlyphInfo)
{
glyph.BearingX = reader.ReadByte();
glyph.Advance = reader.ReadByte();
glyph.Width = glyph.Advance - glyph.BearingX;
}
glyphs.Add(glyph);
}
font.SetGlyphs(glyphs);
// Reserved space
reader.ReadBytes(4 + (4 * numGlyphs));
// Glyphs
// ..Header
reader.ReadUInt32(); // header size
var huffmanTreeSize = reader.ReadInt32();
var compressedDataSize = reader.ReadInt32();
reader.ReadUInt32(); // compressed size in bits
var glyphSize = reader.ReadUInt32();
var numImages = reader.ReadUInt32();
reader.ReadInt32(); // glyph position table size
reader.ReadUInt32(); // uncompressed font size
// ..Huffman Tree
reader.ReadBytes(2); // huffman header
var huffmanTree = reader.ReadBytes(huffmanTreeSize - 2);
// ..Glyph Position Table
var glyphPositions = new int[numImages];
for (int i = 0; i < numImages; i++)
{
glyphPositions[i] = reader.ReadInt32();
}
// ..Compressed data
var compressedGlyphs = reader.ReadBytes(compressedDataSize);
for (int i = 0; i < numImages && i < numGlyphs; i++)
{
var glyph = font.Glyphs[i];
// Get the decompressed bytes for the glyph
var decompressed = new byte[glyphSize * 2];
Huffman.Decompress(
huffmanTree,
compressedGlyphs,
decompressed,
glyphPositions[i]);
int position = 0;
// Convert into array format
int[,] glyphImg = new int[font.CharWidth, font.CharHeight];
for (int h = 0; h < font.CharHeight; h++)
{
for (int w = 0; w < font.CharWidth; w++)
{
glyphImg[w, h] = decompressed[position++];
}
}
glyph.SetImage(glyphImg);
font.Glyphs[i] = glyph;
}
return(font);
}
/// <summary>
/// Convert the specified font into binary format..
/// </summary>
/// <returns>Binary representation of the font.</returns>
/// <param name="source">Font to convert.</param>
public BinaryFormat Convert(GameFont source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
var stream = new DataStream(new MemoryStream(), 0, 0);
var writer = new DataWriter(stream);
int numGlyphs = source.Glyphs.Count;
int pixGlyph = source.CharWidth * source.CharHeight;
// Main header
// Hard-coded: 4 bpp with flags 0x010101
writer.Write(0x20);
writer.Write(0x00); // will set later
writer.Write(0x010101);
writer.Write((ushort)0x00);
writer.Write((ushort)numGlyphs);
writer.Write((ushort)source.CharWidth);
writer.Write((ushort)source.CharHeight);
writer.Write((ushort)(pixGlyph / 2));
writer.Write((ushort)0x01);
stream.WriteTimes(0x00, 8);
// Palette
foreach (var color in source.GetPalette())
{
writer.Write((byte)color.Red);
writer.Write((byte)color.Green);
writer.Write((byte)color.Blue);
if (color.Red > 0 && color.Green > 0 && color.Blue > 0)
{
writer.Write((byte)0x80);
}
else
{
writer.Write((byte)0x00);
}
}
// Variable Width Table (VWT)
int vwtSize = numGlyphs * 2;
writer.Write(vwtSize);
foreach (var glyph in source.Glyphs)
{
writer.Write((byte)glyph.BearingX);
writer.Write((byte)glyph.Advance);
}
// Reserved space
stream.WriteTimes(0x00, 4 + (4 * numGlyphs));
// Glyphs
long glyphSection = stream.RelativePosition;
stream.WriteTimes(0x00, 0x20); // header
// Flatten the glyph bytes
var rawData = new byte[numGlyphs * pixGlyph / 2];
int rawDataIdx = 0;
foreach (var glyph in source.Glyphs)
{
int[,] glyphImg = glyph.GetImage();
for (int h = 0; h < source.CharHeight; h++)
{
for (int w = 0; w < source.CharWidth; w++)
{
if (rawDataIdx % 2 == 0)
{
rawData[rawDataIdx / 2] = (byte)glyphImg[w, h];
}
else
{
rawData[rawDataIdx / 2] |= (byte)(glyphImg[w, h] << 4);
}
rawDataIdx++;
}
}
}
// Get Huffman tree
HuffmanNode huffmanTree = Huffman.MakeTree(rawData);
int huffmanTreeSize = Huffman.WriteTree(huffmanTree, stream);
var codewords = Huffman.GetCodewords(huffmanTree);
// Write empty position table
long positionTableSection = stream.RelativePosition;
stream.WriteTimes(0x00, numGlyphs * 4L);
var compressed = new DataStream(stream, stream.RelativePosition, 0);
int compressedPos = 0;
rawDataIdx = 0;
for (int i = 0; i < numGlyphs; i++)
{
stream.Seek(positionTableSection + (i * 4L), SeekMode.Origin);
writer.Write(compressedPos);
Huffman.Compress(codewords, rawData, rawDataIdx, pixGlyph, compressed, ref compressedPos);
rawDataIdx += pixGlyph;
}
// ..Header
stream.Seek(glyphSection, SeekMode.Origin);
writer.Write(0x20);
writer.Write(huffmanTreeSize);
writer.Write((uint)compressed.Length);
writer.Write(compressedPos);
writer.Write(pixGlyph / 2);
writer.Write(numGlyphs + 1);
writer.Write((numGlyphs + 1) * 4);
writer.Write(rawData.Length);
compressed.Dispose();
// Set the unknown field size
stream.Seek(0x04, SeekMode.Origin);
writer.Write((uint)(stream.Length - vwtSize - 7));
return(new BinaryFormat(stream));
}
