accumulating matrix on the final matrix

    May 03 2010 | 1:18 am
    I am trying to extract specific size (smaller than 320x240) and save into buffer image, and overlay on the final matrix.
    since the height of each object is fixed, I want to use its x coordinate to decide the spot to overlayed on the final matrix screen. and the each images' opacity will be changed when bang it over the final composition.
    so I'd like to know how to accumulate buffered image over the final matrix. I tried to use dstdimstart, dstdimend.
    I wish to know how to overlay image on the designated coordinate on the matrix without any stretching objects.