/// <summary>
/// Try to compress RLE stream, with given bitmap compression type.
/// </summary>
/// <param name="dest">The destination stream that will contains compressed pixel data.</param>
/// <param name="source">The source stream we want to compress from.</param>
/// <param name="sourceSize">The size of the source.</param>
/// <param name="compression">The compression of destination stream.</param>
public static void Compress(Stream dest, Stream source, int sourceSize, BitmapCompression compression)
{
switch (compression)
{
case BitmapCompression.TwentyFourBitsRLE:
CompressTwentyFourBitsRLE(dest, source, sourceSize);
break;
default:
throw new MbmException(String.Format("Unsupported decompression type: {0}", compression.ToString()));
}
}
/// <summary>
/// Try to decompress RLE stream, with given bitmap compression type.
/// </summary>
/// <param name="dest">The destination stream that will contains decompressed pixel data.</param>
/// <param name="source">The source stream we want to decompress from.</param>
/// <param name="compression">The compression of source stream.</param>
public static void Decompress(Stream dest, Stream source, int sourceSize, BitmapCompression compression)
{
switch (compression)
{
case BitmapCompression.TwentyFourBitsRLE:
DecompressTwentyFourBitsRLE(dest, source, sourceSize);
using (var stream = new FileStream("test.bin", FileMode.OpenOrCreate, FileAccess.Write))
{
var last = dest.Position;
dest.Position = 0;
dest.CopyTo(stream);
dest.Position = last;
}
break;
default:
throw new MbmException(String.Format("Unsupported decompression type: {0}", compression.ToString()));
}
}
public static void Save(Document input, Stream output, Surface scratchSurface, UInt32 bpp, BitmapColor colorMode)
{
// Flatten the image first
input.Flatten(scratchSurface);
// Build up SBM Header
SBMHeader header = new SBMHeader();
header.headerLength = 40;
header.sizeInPixel.Width = input.Width;
header.sizeInPixel.Height = input.Height;
header.sizeInTwips.Width = input.Width * 15;
header.sizeInTwips.Height = input.Height * 15;
header.colorMode = colorMode;
header.bitsPerPixel = bpp;
// Determine what compression to use
BitmapCompression compressionToUse = ChooseBestCompressionMode(input.Width, input.Height, bpp, colorMode);
header.compression = compressionToUse;
Int32 stride = MbmFile.GetStride(input.Width, (Byte)bpp);
byte[] rawBitmapData = new byte[stride * input.Height];
byte[] compressedBitmapData = null;
MemoryStream bitmapStream = new MemoryStream(rawBitmapData, 0, rawBitmapData.Length);
ReadRawBitmapData(scratchSurface, bitmapStream, (Byte)bpp);
bitmapStream.Seek(0, SeekOrigin.Begin);
switch (compressionToUse)
{
case BitmapCompression comp when(comp >= BitmapCompression.ByteRLE && comp <= BitmapCompression.ThirtyTwoABitsRLE):
compressedBitmapData = new byte[stride * input.Height];
MemoryStream compressedDestStream = new MemoryStream(compressedBitmapData, 0, compressedBitmapData.Length);
compressedDestStream.Seek(0, SeekOrigin.Begin);
Algorithm.RLECompressor.Compress(compressedDestStream, bitmapStream, stride * input.Height, compressionToUse);
header.bitmapSize = (UInt32)(40 + compressedDestStream.Position);
break;
case BitmapCompression.None:
header.bitmapSize = (UInt32)(40 + stride * input.Height);
break;
default:
throw new MbmException(String.Format("Unsupported bitmap compression type {0}", compressionToUse.ToString()));
}
output.Seek(/*sizeof(MbmHeader)*/ 20, SeekOrigin.Begin);
MbmBinaryWriter writer = new MbmBinaryWriter(output);
// Try to write our header
writer.WriteUInt32(header.bitmapSize);
writer.WriteUInt32(header.headerLength);
writer.WriteSize(header.sizeInPixel);
writer.WriteSize(header.sizeInTwips);
writer.WriteUInt32(header.bitsPerPixel);
writer.WriteUInt32((UInt32)header.colorMode);
writer.WriteUInt32(header.paletteSize);
writer.WriteUInt32((UInt32)header.compression);
// Write data
switch (compressionToUse)
{
case BitmapCompression comp when(comp >= BitmapCompression.ByteRLE && comp <= BitmapCompression.ThirtyTwoABitsRLE):
output.Write(compressedBitmapData, 0, (int)(header.bitmapSize - header.headerLength));
break;
case BitmapCompression.None:
output.Write(rawBitmapData, 0, rawBitmapData.Length);
break;
default:
break;
}
// Write trailer
UInt32 trailerOffset = writer.Tell();
writer.WriteUInt32(1);
writer.WriteUInt32(20);
// Seek back and write our header
writer.Seek(0);
writer.WriteUInt32(MbmHeader.directFileStoreUIDNum);
writer.WriteUInt32(MbmHeader.multiBitmapUIDNum);
writer.WriteUInt32(0);
writer.WriteUInt32(0); // Checksum
writer.WriteUInt32(trailerOffset);
}
