leading up to ivtools-1.1

[Scott J. <sc...@ac...>]

In pushing towards ivtools-1.1 (due in the fall, as usual), I'm looking at
wrapping up a full-featured implementation of the alpha-transparent,
anti-aliasing mechanisms people have come to expect in their
drawing editors.  You really don't need the anti-aliasing until the
drawing gets rendered via ghostscript, but  you want it, don't you.

My plans have been informally documented here:

    http://advogato.org/person/sej/diary.html?start=139

But these are the goals:

    - alpha-transparent rasters with EPS export/import
    - user-selectable global anti-aliasing mechanism by
        rendering to pixmap at 2x, and reducing on the fly
    - polygon-clipped rasters with EPS export/import

This postpones things like PorterDuff alpha-compositing
(with an 8-bit key or mask) and Sketch-like blend-groups
(however you do those), but it augments the easy-to-use,
easy-to-understand GUI of idraw with modern-day tools.

Scott Johnston
 http://www.ivtools.org