/**
* <summary>
* Draws a bitmap at the specified position.
* <para>
* The bitmap is provided as a binary object,
* where each pixel maps to a bit, from left to right and from top to bottom.
* The most significant bit of each byte maps to the leftmost pixel, and the least
* significant bit maps to the rightmost pixel. Bits set to 1 are drawn using the
* layer selected pen color. Bits set to 0 are drawn using the specified background
* gray level, unless -1 is specified, in which case they are not drawn at all
* (as if transparent).
* </para>
* </summary>
* <param name="x">
* the distance from left of layer to the left of the bitmap, in pixels
* </param>
* <param name="y">
* the distance from top of layer to the top of the bitmap, in pixels
* </param>
* <param name="w">
* the width of the bitmap, in pixels
* </param>
* <param name="bitmap">
* a binary object
* </param>
* <param name="bgcol">
* the background gray level to use for zero bits (0 = black,
* 255 = white), or -1 to leave the pixels unchanged
* </param>
* <returns>
* <c>0</c> if the call succeeds.
* </returns>
* <para>
* On failure, throws an exception or returns a negative error code.
* </para>
*/
public virtual int drawBitmap(int x, int y, int w, byte[] bitmap, int bgcol)
{
return(_objptr.drawBitmap(x, y, w, bitmap, bgcol));
}