unsafe static void ReadRawBitmapData(Surface surface, Stream destinationStream, Byte bpp)
{
Int32 stride = MbmFile.GetStride(surface.Width, (Byte)bpp);
for (int y = 0; y < surface.Height; y++)
{
destinationStream.Position = stride * y;
ColorBgra *row = surface.GetRowAddress(y);
for (int x = 0; x < surface.Width; x++)
{
destinationStream.WriteByte(row[x].R);
if (bpp >= 16)
{
destinationStream.WriteByte(row[x].G);
}
if (bpp >= 24)
{
destinationStream.WriteByte(row[x].B);
}
if (bpp >= 32)
{
destinationStream.WriteByte(row[x].A);
}
}
for (int x = surface.Width * (bpp / 8); x < stride; x++)
{
destinationStream.WriteByte(255);
}
}
}
/// <summary>
/// Load bitmap data to Paint.NET surface.
/// </summary>
/// <param name="header">The bitmap header to convert.</param>
/// <param name="offset">The offset of the header in the stream.</param>
/// <param name="source">The source stream.</param>
/// <param name="surface">Paint.NET surface.</param>
unsafe static void LoadBitmapToSurface(SBMHeader header, UInt32 offset, Stream source, Surface surface)
{
UInt32 lastPos = (UInt32)source.Position;
source.Seek(offset + header.headerLength, SeekOrigin.Begin);
UInt32 compressedSize = header.bitmapSize - header.headerLength;
UInt32 stride = (UInt32)MbmFile.GetStride(header.sizeInPixel.Width, (Byte)(header.bitsPerPixel));
UInt32 realSize = (UInt32)header.sizeInPixel.Height * stride;
byte[] decompressedData = new byte[realSize];
MemoryStream destinationStream = new MemoryStream(decompressedData, 0, (int)realSize);
destinationStream.Seek(0, SeekOrigin.Begin);
switch (header.compression)
{
case BitmapCompression comp when(comp <= BitmapCompression.ThirtyTwoABitsRLE && comp > BitmapCompression.None):
Algorithm.RLEDecompressor.Decompress(destinationStream, source, (int)compressedSize, comp);
break;
default:
source.Read(decompressedData, 0, (int)realSize);
break;
}
destinationStream.Seek(0, SeekOrigin.Begin);
for (int y = 0; y < header.sizeInPixel.Height; y++)
{
destinationStream.Seek(stride * y, SeekOrigin.Begin);
ColorBgra *rowData = surface.GetRowAddress(y);
// Convert to PDN representation
switch (header.bitsPerPixel)
{
// These case are generally easy
// Each channel is represent by 8 bits
case UInt32 i when(i % 8 == 0):
for (int x = 0; x < header.sizeInPixel.Width; x++)
{
rowData[x].R = (i >= 8) ? (Byte)destinationStream.ReadByte() : (Byte)0;
rowData[x].G = (i >= 16) ? (Byte)destinationStream.ReadByte() : (Byte)0;
rowData[x].B = (i >= 24) ? (Byte)destinationStream.ReadByte() : (Byte)0;
rowData[x].A = (i >= 32) ? (Byte)destinationStream.ReadByte() : (Byte)255;
}
break;
default:
throw new MbmException(String.Format("Unhandled converting {0} bits per pixel to Paint.NET surface", header.bitsPerPixel));
}
}
source.Seek(lastPos, SeekOrigin.Begin);
}
static BitmapCompression ChooseBestCompressionMode(int width, int height, UInt32 bpp, BitmapColor colorMode)
{
Int32 stride = MbmFile.GetStride(width, (Byte)bpp);
if (width * height <= MaximumSizeNoCompress)
{
// At this size we should not compress. Not worth at all
return(BitmapCompression.None);
}
switch (colorMode)
{
case BitmapColor.ColorWithAlpha:
return(BitmapCompression.ThirtyTwoABitsRLE);
case BitmapColor.ColorWithAlphaPM:
return(BitmapCompression.ThirtyTwoABitsRLE);
case BitmapColor.Color:
break;
default:
throw new MbmException(String.Format("Unsupported bitmap color type to save: {0}", colorMode.ToString()));
}
switch (bpp)
{
case 32:
return(BitmapCompression.ThirtyTwoUBitsRLE);
case 24:
return(BitmapCompression.TwentyFourBitsRLE);
case 16:
return(BitmapCompression.SixteenBitsRLE);
case 12:
return(BitmapCompression.TwelveBitsRLE);
case 8:
return(BitmapCompression.ByteRLE);
default:
break;
}
throw new MbmException(String.Format("Unsupported bits per pixel to save: {0}", bpp));
}
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);
}