DESCRIPTION

Not yet written yet, sorry...

$p

The source pixels (1..4 bytes per pixel, depending on format). Use like this:

$p*3.5		# the return value is the result

$P

The source pixels without alpha. Use it like this:

$P *= 0.5; $p	# modify $P inplace, return also modified $p as result

$x

A two-dimensional vector containing the x-coordinates of each point in the current tile:

$x = (zeroes(long,$w)->xvals + $destination->x)->dummy(1,$h)->sever;

$y

A two-dimensional vector containing the y-coordinates of each point in the current tile:

$y = (zeroes(long,$h)->xvals + $destination->y)->dummy(0,$w)->sever;

$bpp

The bytes per pixel value of the destination area.