Exemplo n.º 1
0
        public void ToFile(string fileName)
        {
            BITMAPFILEHEADER bmfh;

            bmfh.bfType = 0x4D42;
            int fileSize = Marshal.SizeOf(typeof(BITMAPFILEHEADER));

            fileSize        += Marshal.SizeOf(typeof(BITMAPINFOHEADER));
            fileSize        += Marshal.SizeOf(typeof(RGBQUAD)) * colorTable.Count();
            bmfh.bfOffBits   = (uint)fileSize;
            fileSize        += imageData.Count();
            bmfh.bfSize      = (uint)fileSize;
            bmfh.bfReserved1 = 0;
            bmfh.bfReserved2 = 0;
            using (var writer = new BinaryWriter(File.Open(fileName, FileMode.Create)))
            {
                ReadWriteStructWithAllocGCHandle.WriteTo <BITMAPFILEHEADER>(writer, bmfh);
                ReadWriteStructWithAllocGCHandle.WriteTo <BITMAPINFOHEADER>(writer, bmih);
                foreach (var c in colorTable)
                {
                    ReadWriteStructWithAllocGCHandle.WriteTo <RGBQUAD>(writer, c);
                }
                writer.Write(imageData);
            }
        }
Exemplo n.º 2
0
        public static Bmp FromFile(string fileName)
        {
            Bmp bmp = new Bmp();

            using (BinaryReader reader = new BinaryReader(File.Open(fileName, FileMode.Open)))
            {
                BITMAPFILEHEADER bmfh;
                bmfh = ReadWriteStructWithAllocGCHandle.ReadFrom <BITMAPFILEHEADER>(reader);
                if (bmfh.bfType != 0x4D42)
                {
                    throw new FileFormatException();
                }
                bmp.bmih = ReadWriteStructWithAllocGCHandle.ReadFrom <BITMAPINFOHEADER>(reader);
                uint numQuads;
                if (bmp.bmih.biClrUsed == 0)
                {
                    switch (bmp.bmih.biBitCount)
                    {
                    case 1:
                    case 4:
                    case 8:
                        numQuads = (uint)(1 << bmp.bmih.biBitCount);
                        break;

                    default:
                        throw new FileFormatException();
                    }
                }
                else
                {
                    numQuads = bmp.bmih.biClrUsed;
                }

                if (bmp.bmih.biHeight < 0)
                {
                    // TODO: TopDown 形式のサポート
                    throw new NotImplementedException();
                }

                bmp.colorTable = new RGBQUAD[numQuads];
                for (int i = 0; i < numQuads; ++i)
                {
                    bmp.colorTable[i] = ReadWriteStructWithAllocGCHandle.ReadFrom <RGBQUAD>(reader);
                }
                if (reader.BaseStream.Position != bmfh.bfOffBits)
                {
                    throw new FileFormatException();
                }
                // https://stackoverflow.com/a/10038017/4699324
                using (var ms = new MemoryStream())
                {
                    reader.BaseStream.CopyTo(ms);
                    bmp.imageData = ms.ToArray();
                }
            }
            return(bmp);
        } // FromFile