public EditableBitmap()
{
FileName = "";
Height = 0;
Width = 0;
RowSize = 0;
BitsPerPixel = 0;
FileHeader = new BitmapFileHeader();
InfoHeader = new DIBHeader();
}
public void SaveImage(string fileName)
{
var stream = new FileStream(fileName, FileMode.Create);
var writer = new BinaryWriter(stream);
InfoHeader = new DIBHeader
{
Size = (uint)DIBHeaderVersion.BITMAPINFOHEADER,
Width = Width,
Height = Height,
Planes = 1,
BitCount = 24,
Compression = CompressionMethod.BI_RGB,
SizeImage = (uint)(((Width * 3 + 3) & 0xFFFFFFFCu) * Height),
XPelsPerMeter = 2835,
YPelsPerMeter = 2835,
ClrUsed = 0,
ClrImportant = 0
};
FileHeader = new BitmapFileHeader
{
Size = 14 + InfoHeader.Size + InfoHeader.SizeImage,
OffBits = 14 + InfoHeader.Size
};
WriteFileHeader(writer);
WriteDIBHeader(writer);
int paddingSize = RowSize - (Width * BitsPerPixel) / 8;
byte[] paddingData = { 0, 0, 0, 0 };
for (int i = Height - 1; i >= 0; i--)
{
for (int j = 0; j < Width; j++)
{
var cur = GetPixelRowColumn(i, j);
writer.Write(cur.B);
writer.Write(cur.G);
writer.Write(cur.R);
}
writer.Write(paddingData, 0, paddingSize);
}
writer.Close();
stream.Close();
}
private void LoadBitmap()
{
MemoryStream memoryStream = new MemoryStream(File.ReadAllBytes(FileName));
var reader = new BinaryReader(memoryStream);
// read Bitmap file header
FileHeader = new BitmapFileHeader();
ReadFileHeader(reader);
// read DIB header
InfoHeader = new DIBHeader();
ReadDIBHeader(reader);
Height = InfoHeader.Height;
Width = InfoHeader.Width;
BitsPerPixel = InfoHeader.BitCount;
CalcRowSize(); // (in bytes), in addition to padding
if (InfoHeader.Compression != CompressionMethod.BI_RGB &&
InfoHeader.Compression != CompressionMethod.BI_RLE4 &&
InfoHeader.Compression != CompressionMethod.BI_RLE8 &&
InfoHeader.Compression != CompressionMethod.BI_BITFIELDS)
{
throw new Exception("Unsupprted format: " + InfoHeader.Compression);
}
// read Extra bit masks
// 8.8.8.0
BMask = 0x000000FF;
GMask = 0x0000FF00;
RMask = 0x00FF0000;
if (BitsPerPixel == 16)
{
//5.5.5.0
BMask = 0x001F;
GMask = 0x03E0;
RMask = 0x7C00;
}
if (InfoHeader.Size == (uint)DIBHeaderVersion.BITMAPV4HEADER || InfoHeader.Size == (uint)DIBHeaderVersion.BITMAPV5HEADER)
{
BMask = InfoHeader.BlueMask;
GMask = InfoHeader.GreenMask;
RMask = InfoHeader.RedMask;
}
if (InfoHeader.Compression == CompressionMethod.BI_BITFIELDS)
{
RMask = reader.ReadUInt32();
GMask = reader.ReadUInt32();
BMask = reader.ReadUInt32();
}
// it's illegal to combine 1/4/8/24bpp with BI_BITFIELDS or with BITMAPV4HEADER or BITMAPV5HEADER, so I'll ignore the colors bit masks
if (BitsPerPixel != 16 || BitsPerPixel != 32)
{
// default colors bit masks for 24bpp
BMask = 0x000000FF;
GMask = 0x0000FF00;
RMask = 0x00FF0000;
}
// Top-down DIBs cannot be compressed
if (Height < 0 &&
(InfoHeader.Compression != CompressionMethod.BI_RGB || InfoHeader.Compression != CompressionMethod.BI_BITFIELDS))
{
throw new Exception("Top-down DIBs can't be compressed. DIBHeader.Compression=" + InfoHeader.Compression);
}
if (BitsPerPixel <= 8 || InfoHeader.ClrUsed > 0)
{
ReadPalette(reader);
}
else
{
Palette = null;
}
SeekToPixelArray(reader);
if (BitsPerPixel == 32)
{
Read32bitBitmap(memoryStream, Height < 0);
}
else if (BitsPerPixel == 24)
{
Read24bitBitmap(memoryStream, Height < 0);
}
else if (BitsPerPixel == 16)
{
Read16bitBitmap(memoryStream, Height < 0);
}
else if (BitsPerPixel == 8)
{
if (InfoHeader.Compression == CompressionMethod.BI_RLE4)
{
ReadRLE4Bitmap(reader);
}
else if (InfoHeader.Compression == CompressionMethod.BI_RLE8)
{
ReadRLE8Bitmap(reader);
}
else
{
ReadIndexedBitmap(memoryStream, Height < 0);
}
}
// no need to keep it negative, in case it is
Height = Math.Abs(Height);
memoryStream.Dispose();
reader.Dispose();
}
