protected void CreateDIBSection(int cx, int cy, int ppm_x, int ppm_y, short BitCount)
{
IntPtr hDC = WinInvoke32.GetDC(IntPtr.Zero);
if(hDC.Equals(IntPtr.Zero)) return;
IntPtr pvBits = IntPtr.Zero;
BITMAPINFO BitmapInfo = new BITMAPINFO();
BitmapInfo.bmiHeader = new BITMAPINFOHEADER();
BitmapInfo.bmiHeader.biSize = 40;
BitmapInfo.bmiHeader.biWidth = cx;
BitmapInfo.bmiHeader.biHeight = cy;
BitmapInfo.bmiHeader.biPlanes = 1;
BitmapInfo.bmiHeader.biBitCount = BitCount;
BitmapInfo.bmiHeader.biCompression = WinInvoke32.BI_RGB;
BitmapInfo.bmiHeader.biSizeImage = 0;
BitmapInfo.bmiHeader.biXPelsPerMeter = ppm_x;
BitmapInfo.bmiHeader.biYPelsPerMeter = ppm_y;
BitmapInfo.bmiHeader.biClrImportant = 0;
BitmapInfo.bmiHeader.biClrUsed = 0;
m_hBitmap = WinInvoke32.CreateDIBSection(hDC, ref BitmapInfo, 0, pvBits, IntPtr.Zero, 0);
if(m_hBitmap.Equals(IntPtr.Zero))
{
WinInvoke32.ReleaseDC(IntPtr.Zero, hDC);
return;
}
else
{
IntPtr hdcMemory = WinInvoke32.CreateCompatibleDC(hDC);
IntPtr hbmpOld = WinInvoke32.SelectObject( hdcMemory, m_hBitmap );
RECT rc;
rc.left = rc.top = 0;
rc.right = cx;
rc.bottom = cy;
IntPtr hBrush = WinInvoke32.GetStockObject(WinInvoke32.WHITE_BRUSH);
WinInvoke32.FillRect(hdcMemory, ref rc, hBrush);
WinInvoke32.SelectObject(hdcMemory, hbmpOld);
WinInvoke32.DeleteDC(hdcMemory);
}
WinInvoke32.ReleaseDC(IntPtr.Zero, hDC);
}
public static extern IntPtr CreateDIBSection(IntPtr hDC, ref BITMAPINFO pBitmapInfo, int un, IntPtr lplpVoid, IntPtr handle, int offset);