// returns color at specified point.
// the return value suited for current pixel format.
// outrange point will raise an error.
int getColorAt(int x, int y)
{
RECT r = new RECT();
r.Left = x;
r.Top = y;
r.Bottom = r.Top + 1;
r.Right = r.Left + 1;
DDSURFACEDESC2 desc = new DDSURFACEDESC2();
surface.GetSurfaceDesc(ref desc);
surface.Lock(ref r, ref desc, CONST_DDLOCKFLAGS.DDLOCK_WAIT | CONST_DDLOCKFLAGS.DDLOCK_READONLY, 0);
int c = surface.GetLockedPixel(x, y);
surface.Unlock(ref r);
return(c);
}
internal Surface(DirectDrawSurface7 _handle)
{
this.surface = _handle;
// compute the size of this surface
DDSURFACEDESC2 desc = new DDSURFACEDESC2();
surface.GetSurfaceDesc(ref desc);
this.size = new Size(desc.lWidth, desc.lHeight);
resetClipRect();
// compute the bit shift width for color fill
DDPIXELFORMAT pixelFormat = new DDPIXELFORMAT();
surface.GetPixelFormat(ref pixelFormat);
widthR = countBitWidth(pixelFormat.lRBitMask);
widthG = countBitWidth(pixelFormat.lGBitMask);
widthB = countBitWidth(pixelFormat.lBBitMask);
}
/// <summary>
/// Initialize a new surface based on a previously created surface
/// </summary>
/// <param name="directDrawSurface">The native DirectDraw surface used as reference.</param>
public DirectDrawSurface(DirectDrawSurface7 directDrawSurface)
{
directDrawSurface.GetSurfaceDesc(ref descriptor);
surface = directDrawSurface;
}
/// <summary>
/// Initialize a new surface based on a previously created surface
/// </summary>
/// <param name="directDrawSurface">The native DirectDraw surface used as reference.</param>
internal DirectDrawSurface(DirectDrawSurface7 directDrawSurface)
{
directDrawSurface.GetSurfaceDesc(ref _descriptor);
_surface = directDrawSurface;
}
/// <summary>
/// Initialize a new surface based on a previously created surface
/// </summary>
/// <param name="directDrawSurface">The native DirectDraw surface used as reference.</param>
public DirectDrawSurface(DirectDrawSurface7 directDrawSurface)
{
directDrawSurface.GetSurfaceDesc(ref descriptor);
surface = directDrawSurface;
}