Re: 8 bit image


> How do I instantiate an RGBQUAD?

[StructLayout(LayoutKind.Sequential)]
public struct RGBQUAD
{
public byte rgbBlue;
public byte rgbGreen;
public byte rgbRed;
public byte rgbReserved;
};

[StructLayout(LayoutKind.Sequential)]
public struct BITMAPINFOHEADER
{
public uint biSize;
public int biWidth;
public int biHeight;
public ushort biPlanes;
public ushort biBitCount;
public uint biCompression;
public uint biSizeImage;
public int biXPelsPerMeter;
public int biYPelsPerMeter;
public uint biClrUsed;
public uint biClrImportant;
};

[StructLayout(LayoutKind.Sequential)]
public struct BITMAPINFO
{
public BITMAPINFOHEADER bmiHeader;
[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray,
SizeConst=1024)]
public RGBQUAD [] bmiColors;
};


// For 8bpp Image
BITMAPINFO bmi = new BITMAPINFO();

bmi.bmiHeader.biSize = (UInt32)Marshal.SizeOf(bmi.bmiHeader);
// you fill out the rest of the structure
....

// fill in the color palette, either read the colors from a file or create
them yourself
for ( int i = 0; i < 256; i++ )
{
bmi.bmiColors[i].rgbBlue = blue; // you supply the colors
bmi.bmiColors[i].rgbRed = red;
bmi.bmiColors[i].rgbGreen = green;
bmi.bmiColors[i].rgbReserved = 0;
}

....

// Create 8bpp DIB bitmap
IntPtr hBmp = CreateDIBSection(hDC, bmi, 0, ref pBits, IntPtr.Zero, 0);

I hope this helps!



.

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