Russell,
Unicode does not deal with text rendering -- this is another level. The
character-to-glyph transformation is being done on a layout level. The
most popular layout system is OpenType Layout. Then, the laid out glyph
coordinates are passed to a rasterizer such as the Microsoft system
rasterizer or such as FreeType.
This should be your first reading:
http://www.microsoft.com/typography/Glyph%20Processing/overview.mspx
The most popular OpenType Layout engines are Uniscribe (pre-installed on
Windows, available through APIs), ICU Layout (opensource),
Pango/HarfBuzz (opensource), Monotype WorldType (commercial), Bitstream
Panorama (commercial). On Mac OS X, there is a number of text subsystems
such as ATSUI or CoreText, but they only support OpenType Layout in a
limited way (though the support was somewhat extended in Mac OS X 10.5).
A.
Russell Shaw wrote:
Hi,
I was thinking of making a multilingual text editor.
I don't get how glyphs are done outside of english.
I've read the Unicode Standard book.
When a paragraph of unicode characters is processed, the glyphs
are layed out according to the state contained in the unicode
character sequence.
Depending on this state, the same unicode characters can map to
multiple glyphs depending on context.
If multiple fonts exist for a language, then for all these font
files to work with an editor, then all these glyphs must be indexed
the same.
Where can i find the standard that specifies what glyphs are indexed
by what number? Or are these glyphs created on the fly by the unicode
paragraph layout processor?
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Adam Twardoch
| Language Typography Unicode Fonts OpenType
| twardoch.com | silesian.com | fontlab.net
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