art_rgb_affine()

Hello,

In art_rgb_affine(), how should I know what size the final image needs?
I know that max(size) is sqr(a^2 + b^2), but how should one get the
real size for a given angle? In other words, how big should dst be and
what values should x0, y0, x1, y1, dst_rowstride contain?


Best regards and thanks in advance,

Leslie


(a CC'd reply would be kind)