Pixmaps and Masks?

[SEGV <mlepage cgocable net>]

Suppose I have:


    GdkPixmap* pLargeImage; // 256x256 image
    GdkPixmap* pSmallImage; // 32x32 image
    GdkBitmap* pSmallImageMask; // 32x32 image mask


I can copy the small pixmap to the centre of the large pixmap with this call:

    gdk_draw_pixmap(pLargeImage, gc, pSmallImage,
        0, 0, // src
        112, 112, // dest
        32, 32);


How can preserve the transparency in the small image? That is, in this case, how
do I use the mask?


-- 
SEGV    http://www.cgocable.net/~mlepage/