Hagen - Pragma ADE

30
Modes
glyph 256
font 42: U+00074: t
glyph 256
font 42: U+00065: e
glyph 256
font 42: U+00073: s
glyph 256
font 42: U+00074: t
userskip
1.9072 - 0.9536 + 0.6357
glyph 256
font 42: U+00042: B
glyph 256
font 42: U+0004C: L
glyph 256
font 42: U+00041: A
glyph 256
font 42: U+00074: t
glyph 256
font 42: U+00065: e
glyph 256
font 42: U+00073: s
glyph 256
font 42: U+00074: t
Figure 2.2 The text ‘test BLAtest’
converted to nodes.
In addition to hyphenation and kerning we can have ligatures. The list in figure 2.4
shows that we get a reference to a ligature in the glyph node but that the components
are still known. This figure also demonstrates that the ligature is build in steps.
A.10 If we insert an explicit \discretionary command, we see in figure 2.5 that we get
three variants. In figure 2.6 we render some Dutch words and these have quite some
ligatures.
So, we have hyphenation, ligature building and kerning and to some extent these
mechanisms hook into each other. This process is driven by information stored in the
font and rules related to the language. The hyphenation happens first, so the builder
just sees discretionary nodes and needs to act properly on them. Although languages
play an important role in formatting the text, for the moment we can forget about that.
This leaves the font.
As we already mentioned in a previous chapter, in ConT E Xt we use Unicode internally.
This also means that fonts are organized this way. By default the glyph representation
of a Unicode character sits in the same slot in the glyph table. All additional glyphs, like