private void WriteBMPFile(string fileName, DDSFile ddsFile, BC1CompressionFormat compressionFormat)
{
using (BinaryWriter writer = new BinaryWriter(File.Open(fileName, FileMode.Create)))
{
byte[] BMPMagicNumber = { 0x42, 0x4D };
int BMPFileHeaderSize = 14;
int BMPFileInfoHeaderSize = 40;
int imageRawSize = (int)ddsFile.DDSHeader.Width * (int)ddsFile.DDSHeader.Height * 3;
int fileSize = imageRawSize + BMPFileHeaderSize + BMPFileInfoHeaderSize;
var bmpFile = new BMPFile();
bmpFile.BMPFileHeader = new BMPFileHeader();
bmpFile.BMPFileHeader.MagicHeader = BMPMagicNumber;
bmpFile.BMPFileHeader.Reserved1 = 0;
bmpFile.BMPFileHeader.Reserved2 = 0;
bmpFile.BMPFileHeader.FileSize = (uint)fileSize;
bmpFile.BMPFileHeader.OffToPixelArray = (uint)BMPFileHeaderSize + (uint)BMPFileInfoHeaderSize;
bmpFile.BMPFileInfoHeader = new BMPFileInfoHeader();
bmpFile.BMPFileInfoHeader.HeaderSize = (uint)BMPFileInfoHeaderSize;
bmpFile.BMPFileInfoHeader.Width = ddsFile.DDSHeader.Width;
bmpFile.BMPFileInfoHeader.Height = ddsFile.DDSHeader.Height;
bmpFile.BMPFileInfoHeader.ColorPlanes = 1;
bmpFile.BMPFileInfoHeader.BitCount = 24;
bmpFile.BMPFileInfoHeader.CompressionType = 0;
bmpFile.BMPFileInfoHeader.RawDataSize = (uint)imageRawSize;
bmpFile.BMPFileInfoHeader.HorizontalPixelPerMeter = 2835;
bmpFile.BMPFileInfoHeader.VerticalPixelPerMeter = 2835;
bmpFile.BMPFileInfoHeader.ColorsUsed = 0;
bmpFile.BMPFileInfoHeader.ImportantColors = 0;
writer.Write(bmpFile.BMPFileHeader.MagicHeader);
writer.Write(bmpFile.BMPFileHeader.FileSize);
writer.Write(bmpFile.BMPFileHeader.Reserved1);
writer.Write(bmpFile.BMPFileHeader.Reserved2);
writer.Write(bmpFile.BMPFileHeader.OffToPixelArray);
writer.Write(bmpFile.BMPFileInfoHeader.HeaderSize);
writer.Write(bmpFile.BMPFileInfoHeader.Width);
writer.Write(bmpFile.BMPFileInfoHeader.Height);
writer.Write(bmpFile.BMPFileInfoHeader.ColorPlanes);
writer.Write(bmpFile.BMPFileInfoHeader.BitCount);
writer.Write(bmpFile.BMPFileInfoHeader.CompressionType);
writer.Write(bmpFile.BMPFileInfoHeader.RawDataSize);
writer.Write(bmpFile.BMPFileInfoHeader.HorizontalPixelPerMeter);
writer.Write(bmpFile.BMPFileInfoHeader.VerticalPixelPerMeter);
writer.Write(bmpFile.BMPFileInfoHeader.ColorsUsed);
writer.Write(bmpFile.BMPFileInfoHeader.ImportantColors);
bmpFile.PixelData = new byte[imageRawSize];
int numberOfVerticalBlocks = (int)ddsFile.DDSHeader.Height / Constants.BlockDimension;
int numberOfHorizontalBlocks = (int)ddsFile.DDSHeader.Width / Constants.BlockDimension;
int numberOfBlocks = numberOfVerticalBlocks * numberOfHorizontalBlocks;
for (int i = 0; i < numberOfBlocks; ++i)
{
var blockIndex = Helpers.ToColumnMajor(i, numberOfHorizontalBlocks);
var blockData = ddsFile.GetBlockData(blockIndex);
var blockColors = compressionFormat.Decompress(blockData);
bmpFile.SetBlockColors(blockIndex, blockColors);
}
writer.Write(bmpFile.PixelData.FlipArrayHorizontal((int)bmpFile.BMPFileInfoHeader.Height));
}
}
