private void ShowInfos(string fileName)
{
Bitmap bmp = null;
try
{
string boxText;
string bmpText = string.Empty;
if (Path.GetExtension(fileName) == ".ico")
{
Icon icon = new Icon(fileName);
bmp = icon.ToBitmap();
icon.Dispose();
}
else
{
bmp = new Bitmap(fileName);
if (bmp.RawFormat.Guid == ImageFormat.Bmp.Guid)
{
//Analyze the Headers
BITMAPFILEHEADER fileHeader = new BITMAPFILEHEADER();
BITMAPINFOHEADER infoHeader = new BITMAPINFOHEADER();
FileStream stream = File.OpenRead(fileName);
BinaryReader reader = new BinaryReader(stream);
fileHeader.bfType = reader.ReadUInt16();
fileHeader.bfSize = reader.ReadUInt32();
fileHeader.bfReserved1 = reader.ReadUInt16();
fileHeader.bfReserved2 = reader.ReadUInt16();
fileHeader.bfOffBits = reader.ReadUInt32();
infoHeader.biSize = reader.ReadUInt32();
infoHeader.biWidth = reader.ReadInt32();
infoHeader.biHeight = reader.ReadInt32();
infoHeader.biPlanes = reader.ReadUInt16();
infoHeader.biBitCount = reader.ReadUInt16();
infoHeader.biCompression = (BitmapCompressionMode)reader.ReadUInt32();
infoHeader.biSizeImage = reader.ReadUInt32();
infoHeader.biXPelsPerMeter = reader.ReadInt32();
infoHeader.biYPelsPerMeter = reader.ReadInt32();
infoHeader.biClrUsed = reader.ReadUInt32();
infoHeader.biClrImportant = reader.ReadUInt32();
reader.Close();
if (infoHeader.biSize == 40)
{
bmpText = "Bitmap V1 Header";
}
else if (infoHeader.biSize == 124)
{
bmpText = "Bitmap V5 Header";
}
else if (infoHeader.biSize == 108)
{
bmpText = "Bitmap V4 Header";
}
else if (infoHeader.biSize == 56)
{
bmpText = "Bitmap V3 Header";
}
else if (infoHeader.biSize == 52)
{
bmpText = "Bitmap V2 Header";
}
bmpText += Environment.NewLine + "Compression: " + infoHeader.biCompression.ToString();
}
}
int stride;
BitmapData data = bmp.LockBits(new Rectangle(Point.Empty, bmp.Size), ImageLockMode.ReadOnly, bmp.PixelFormat);
stride = data.Stride;
bmp.UnlockBits(data);
boxText = string.Format("Width: {0}, Height: {1}" + Environment.NewLine + "PixelFormat: {2}" + Environment.NewLine + "Stride: {3}", bmp.Width, bmp.Height, bmp.PixelFormat, stride);
MessageBox.Show(boxText + Environment.NewLine + bmpText, Path.GetFileName(fileName), MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
bmp?.Dispose();
}
}
/// <remarks>
/// Using Windows DIB Header BITMAPV5INFOHEADER
/// DataType: BI_BITFIELDS (3)
/// For compatibility with the GDI bitmap formats:
/// RGBAX is 8.8.8.8.0
/// Red mask = 0xFF0000
/// Green mask = 0xFF00
/// Blue mask = 0xFF
/// Alpha mask = 0xFF000000
/// No Gamma correction
/// No Compression
/// Encoding 32 bits bitmap to 32 bits file takes ~2.5ms per megapixel
/// Forcing 24 bits bitmap to 32 bits file takes ~10.0ms per megapixel
/// </remarks>
private void Encode32Bpp(Image bmp)
{
BITMAPFILEHEADER bmpFH = BITMAPFILEHEADER.Create();
BITMAPV5HEADER bmpV5 = BITMAPV5HEADER.Create();
Bitmap bitmap = CastImageToBitmap(bmp);
BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
int paddingLength = 0;
int rowSize = data.Stride < 0 ? -data.Stride : data.Stride;
using (BinaryWriter bw = new BinaryWriter(new FileStream(_path, FileMode.Create)))
{
// Encodes file header
uint rawDataLength;
if (bitmap.PixelFormat == PixelFormat.Format24bppRgb)
{
paddingLength = 4 - ((data.Width * 3) % 4);
if (paddingLength == 4)
{
paddingLength = 0;
}
rawDataLength = (uint)(((rowSize - paddingLength) * data.Height * 4) / 3);
}
else
{
rawDataLength = (uint)(rowSize * data.Height);
}
bmpFH.bfSize = FileHeaderSize + bmpV5.biSize + rawDataLength;
bmpFH.bfOffBits = FileHeaderSize + bmpV5.biSize;
//=============== Read just for forced (Padding)===================================
bw.Write(bmpFH.bfType);
bw.Write(bmpFH.bfSize);
bw.Write(bmpFH.bfReserved1);
bw.Write(bmpFH.bfReserved2);
bw.Write(bmpFH.bfOffBits);
// Encodes DBI Header
bmpV5.biWidth = bitmap.Width;
bmpV5.biHeight = bitmap.Height;
bmpV5.biPlanes = 1;
bmpV5.biBitCount = 32;
bmpV5.biCompression = BitmapCompressionMode.BI_BITFIELDS;
bmpV5.biSizeImage = rawDataLength;
bmpV5.biXPelsPerMeter = 0xec4; // (int)Math.Round(bitmap.VerticalResolution * 39.3701); // Pixels per meter
bmpV5.biYPelsPerMeter = 0xec4; // (int)Math.Round(bitmap.VerticalResolution * 39.3701); // Pixels per meter
bmpV5.biClrUsed = 0;
bmpV5.biClrImportant = 0;
// Encodes DBI Extra for ARGB
bmpV5.biRedMask = 0xff0000;
bmpV5.biGreenMask = 0xff00;
bmpV5.biBlueMask = 0xff;
bmpV5.biAlphaMask = 0xff000000;
bmpV5.biCSType = 0x57696e20; //= "Win ", sRGB = 0x73524742;
bmpV5.biEndPoints = new byte[36];
bmpV5.biGammaRed = 0;
bmpV5.biGammaGreen = 0;
bmpV5.biGammaBlue = 0;
bmpV5.biIntent = (int)GamutMappingIntent.LCS_GM_IMAGES;
bmpV5.biProfileData = 0;
bmpV5.biProfileSize = 0;
bmpV5.biReserved = 0;
bw.Write(bmpV5.biSize);
bw.Write(bmpV5.biWidth);
bw.Write(bmpV5.biHeight);
bw.Write(bmpV5.biPlanes);
bw.Write(bmpV5.biBitCount);
bw.Write((uint)bmpV5.biCompression);
bw.Write(bmpV5.biSizeImage);
bw.Write(bmpV5.biXPelsPerMeter);
bw.Write(bmpV5.biYPelsPerMeter);
bw.Write(bmpV5.biClrUsed);
bw.Write(bmpV5.biClrImportant);
bw.Write(bmpV5.biRedMask);
bw.Write(bmpV5.biGreenMask);
bw.Write(bmpV5.biBlueMask);
bw.Write(bmpV5.biAlphaMask);
bw.Write(bmpV5.biCSType);
bw.Write(bmpV5.biEndPoints);
bw.Write(bmpV5.biGammaRed);
bw.Write(bmpV5.biGammaGreen);
bw.Write(bmpV5.biGammaBlue);
bw.Write(bmpV5.biIntent);
bw.Write(bmpV5.biProfileData);
bw.Write(bmpV5.biProfileSize);
bw.Write(bmpV5.biReserved);
// Encodes image data
byte[] rowBytes = new byte[rowSize];
if (bitmap.PixelFormat == PixelFormat.Format24bppRgb)
{
// Forces 24 bits bitmap to 32 bits file
IntPtr ptr = data.Scan0 + ((bmp.Height - 1) * data.Stride);
byte[] bytesWithAlpha = new byte[((rowBytes.Length - paddingLength) * 4) / 3];
for (int i = (bmp.Height - 1); i >= 0; i--, ptr -= data.Stride)
//for (IntPtr ptr = data.Scan0 + ((bmp.Height - 1) * data.Stride); ptr.ToInt64() >= data.Scan0.ToInt64(); ptr -= data.Stride)
{
Marshal.Copy(ptr, rowBytes, 0, data.Stride);
int index = 0;
int num = rowBytes.Length - paddingLength;
for (int x = 0; x < num; x++)
{
bytesWithAlpha[index] = rowBytes[x];
index++;
if ((x % 3) == 2)
{
bytesWithAlpha[index] = ForcedAlpha;
index++;
}
}
bw.Write(bytesWithAlpha);
}
}
else
{
// 32 bits bitmap to 32 bits file
IntPtr ptr = data.Scan0 + ((bmp.Height - 1) * data.Stride);
for (int i = (bmp.Height - 1); i >= 0; i--, ptr -= data.Stride)
//for (IntPtr ptr = data.Scan0 + ((bmp.Height - 1) * data.Stride); ptr.ToInt64() >= data.Scan0.ToInt64(); ptr -= data.Stride)
{
Marshal.Copy(ptr, rowBytes, 0, rowSize);
bw.Write(rowBytes);
}
}
}
bitmap.UnlockBits(data);
}