public MemoryStream EncodePalette()
{
// Calculate what the length of the palette will be
int paletteLength = 16 + (m_paletteEntries * m_pixelCodec.Bpp / 8);
MemoryStream destination = new MemoryStream(paletteLength);
// Write out the PVPL header
destination.WriteByte((byte)'P');
destination.WriteByte((byte)'V');
destination.WriteByte((byte)'P');
destination.WriteByte((byte)'L');
PTStream.WriteInt32(destination, paletteLength - 8);
destination.WriteByte((byte)m_pixelFormat);
destination.WriteByte(0);
PTStream.WriteUInt32(destination, 0);
PTStream.WriteUInt16(destination, m_paletteEntries);
// Write the palette data
byte[] palette = m_pixelCodec.EncodePalette(m_decodedPalette, m_paletteEntries);
destination.Write(palette, 0, palette.Length);
return(destination);
}
public MemoryStream EncodeTexture()
{
// Calculate what the length of the texture will be
int textureLength = 16 + (TextureWidth * TextureHeight * DataCodec.Bpp / 8);
if (HasGlobalIndex)
{
textureLength += 16;
}
if (DataCodec.PaletteEntries != 0 && !DataCodec.NeedsExternalPalette)
{
textureLength += (DataCodec.PaletteEntries * PixelCodec.Bpp / 8);
}
// Calculate the mipmap padding (if the texture contains mipmaps)
int mipmapPadding = 0;
if (DataCodec.HasMipmaps)
{
if (DataFormat == PvrDataFormat.SQUARE_TWIDDLED_MIPMAP)
{
// A 1x1 mipmap takes up as much space as a 2x1 mipmap
// There are also 4 extra bytes at the end of the file
mipmapPadding = (DataCodec.Bpp) >> 3;
textureLength += 4;
}
else if (DataFormat == PvrDataFormat.SQUARE_TWIDDLED_MIPMAP_ALT)
{
// A 1x1 mipmap takes up as much space as a 2x2 mipmap
mipmapPadding = (3 * DataCodec.Bpp) >> 3;
}
textureLength += mipmapPadding;
for (int size = 1; size < TextureWidth; size <<= 1)
{
textureLength += Math.Max((size * size * DataCodec.Bpp) >> 3, 1);
}
}
MemoryStream destination = new MemoryStream(textureLength);
// Write out the GBIX header (if we are including one)
if (HasGlobalIndex)
{
destination.WriteByte((byte)'G');
destination.WriteByte((byte)'B');
destination.WriteByte((byte)'I');
destination.WriteByte((byte)'X');
PTStream.WriteUInt32(destination, 8);
PTStream.WriteUInt32(destination, GlobalIndex);
PTStream.WriteUInt32(destination, 0);
}
// Write out the PVRT header
destination.WriteByte((byte)'P');
destination.WriteByte((byte)'V');
destination.WriteByte((byte)'R');
destination.WriteByte((byte)'T');
if (HasGlobalIndex)
{
PTStream.WriteInt32(destination, textureLength - 24);
}
else
{
PTStream.WriteInt32(destination, textureLength - 8);
}
destination.WriteByte((byte)PixelFormat);
destination.WriteByte((byte)DataFormat);
PTStream.WriteUInt16(destination, 0);
PTStream.WriteUInt16(destination, TextureWidth);
PTStream.WriteUInt16(destination, TextureHeight);
// If we have an internal palette, write it
if (DataCodec.PaletteEntries != 0 && !DataCodec.NeedsExternalPalette)
{
byte[] palette = PixelCodec.EncodePalette(m_texturePalette, DataCodec.PaletteEntries);
destination.Write(palette, 0, palette.Length);
}
// Write out any mipmaps
if (DataCodec.HasMipmaps)
{
// Write out any padding bytes before the 1x1 mipmap
for (int i = 0; i < mipmapPadding; i++)
{
destination.WriteByte(0);
}
for (int size = 1; size < TextureWidth; size <<= 1)
{
byte[] mipmapDecodedData = null;
if (DataCodec.NeedsExternalPalette)
{
if (DataCodec.VQ)
{
mipmapDecodedData = BitmapToRawVQResized(m_decodedBitmap, size, 1, m_codeBook);
}
else
{
mipmapDecodedData = BitmapToRawIndexedResized(m_decodedBitmap, size, 1, m_palette);
}
}
else
{
mipmapDecodedData = BitmapToRawResized(m_decodedBitmap, size, 1);
}
byte[] mipmapTextureData = DataCodec.Encode(mipmapDecodedData, 0, size, size);
destination.Write(mipmapTextureData, 0, mipmapTextureData.Length);
}
}
// Write the texture data
byte[] textureData = DataCodec.Encode(m_decodedData, TextureWidth, TextureHeight, null);
destination.Write(textureData, 0, textureData.Length);
// If the data format is square twiddled with mipmaps, write out the extra bytes.
if (DataFormat == PvrDataFormat.SQUARE_TWIDDLED_MIPMAP)
{
destination.Write(new byte[] { 0, 0, 0, 0 }, 0, 4);
}
// Compress the texture
if (CompressionFormat != PvrCompressionFormat.NONE)
{
CompressionCodec = PvrCompressionCodec.GetCompressionCodec(CompressionFormat);
if (CompressionCodec != null)
{
// Ok, we need to convert the current stream to an array, compress it, then write it back to a new stream
byte[] buffer = destination.ToArray();
buffer = CompressionCodec.Compress(buffer, (HasGlobalIndex ? 0x20 : 0x10), PixelCodec, DataCodec);
destination = new MemoryStream();
destination.Write(buffer, 0, buffer.Length);
}
}
return(destination);
}
