public static Bitmap GetDrawingBitmap(this IntPtr dibBitmap)
{
Bitmap finalImg = null;
if (dibBitmap != IntPtr.Zero && IsDib(dibBitmap))
{
Bitmap tempImg = null;
try
{
BITMAPINFOHEADER header = (BITMAPINFOHEADER)Marshal.PtrToStructure(dibBitmap, typeof(BITMAPINFOHEADER));
if (header.Validate())
{
PixelFormat format = header.GetDrawingPixelFormat();
tempImg = new Bitmap(header.biWidth, Math.Abs(header.biHeight), header.GetStride(), format, header.GetScan0(dibBitmap));
ColorPalette pal = header.GetDrawingPalette(dibBitmap);
if (pal != null)
{
tempImg.Palette = pal;
}
float xdpi = header.GetXDpi();
float ydpi = header.GetYDpi();
if (xdpi != 0 && ydpi == 0)
{
ydpi = xdpi;
}
else if (ydpi != 0 && xdpi == 0)
{
xdpi = ydpi;
}
if (xdpi != 0)
{
tempImg.SetResolution(xdpi, ydpi);
}
if (header.IsBottomUpImage)
{
tempImg.RotateFlip(RotateFlipType.RotateNoneFlipY);
}
finalImg = tempImg;
tempImg = null;
}
}
finally
{
if (tempImg != null)
{
tempImg.Dispose();
}
}
}
return(finalImg);
}