Ron Yust wrote:
> Phil,
>
> Can you answer just one question? Has the Java2D team talked to the Swing
> team about this problem?
>
> It's amazing that as long as Swing and Java2D have been out (even in beta)
> that no one has attempted to address this problem. I've seen Swing code
> that checks whether it is running a 1.2.x VM so I know they can program for
> Java2 differences. I'll bet they are not even aware of what should be
> changed. Or they may feel it is a Java2D problem instead since
> Windows-based anti-aliased text looks fine with Swing. Maybe it's Java2D's
> AA algorithm that erroneously extends the length of text. I would expect an
> AA text string to be the same length as a non-AA string, but just more
> readable. This is how I see other AA rendering on my Windows NT and
> Macintosh machines!
Rendering glyphs is more complicated than that. Depending upon the antialiasing
implementation, and the complexity and point size of the glyph, the glyph may
need to be slightly "stretched" in the horizontal (or vertical) direction. This
stretching is necessary to ensure that the glyph is rendered into enough pixels
that it is legible. For example, consider what happens to a lowercase "m" as the
point size is decreased - a bounding box that encompases the pixels of the glyph
will not scale linearly. If the bounding box did scale linearly, the vertical
stems on the "m" would have no space between them at a small enough point size.
Simply toggling AA on and off may not guarantee that the rendered glyphs have
the same pixel dimensions.
However, I'd certainly agree that Java base classes and Swing should handle AA
in identical fashion.
> -Ron
>
> > Its not quite that simple, since getStringBounds() needs to know the G2D
> > It is believed that Swing's metrics calculations are structured
> > in a way that
> > assumes the metrics are not affected by anything. This would probably
> > require significant changes in Swing, possibly with some
> > performance impact.
> > The Swing team will look into how they should handle this, but its not
> > going to make a release this year, so the recommendation is not
> > to use A-A text.
> >
> > -Phil.
>
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