gdkDrawRgbImage(object, gc, x, y, width, height, dith, rgb.buf, rowstride)rowstride parameter allows for lines to be aligned more flexibly.
For example, lines may be allocated to begin on 32-bit boundaries,
even if the width of the rectangle is odd. Rowstride is also useful
when drawing a subrectangle of a larger image in memory. Finally, to
replicate the same line a number of times, the trick of setting
rowstride to 0 is allowed.
In general, for 0 <= i="" <="" j *
rowstride + i * 3], green value rgb.buf[j * rowstride + i * 3 +
1], and blue value rgb.buf[j * rowstride + i * 3 + 2].