Free-shape text formatting

TeX line-breaking algorithm needs to know the widths of all the resulting
lines in advance. That limits its applicability to free-shape layouts
because the line width may depend on the vertical position of the line which
in turn may depend on future page break and cannot be always known in advance.

We will present a generalised version of the line breaking algorithm which
works inside a general shape and allows vertical stretching of the
formatted text.

However, this generalised algorithm assumes interdependency of the line and
page breaking and therefore cannot be easily integrated into TeX formatting
model. We will discuss the necessary generalisations of TeX document and
formatting model which would make reliable free-shape text formatting
possible.