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Third Party Harfbuzz
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84186a64
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Third Party Harfbuzz
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体验新版 GitCode,发现更多精彩内容 >>
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84186a64
编写于
8月 01, 2012
作者:
B
Behdad Esfahbod
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Add commentary on the compatibility decomposition in the normalizer
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src/hb-ot-shape-normalize.cc
src/hb-ot-shape-normalize.cc
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src/hb-ot-shape-normalize.cc
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@@ -63,10 +63,22 @@
*
* - When a font does not support a character but supports its decomposition,
* well, use the decomposition (preferring the canonical decomposition, but
* falling back to the compatibility decomposition if necessary).
* falling back to the compatibility decomposition if necessary). The
* compatibility decomposition is really nice to have, for characters like
* ellipsis, or various-sized space characters.
*
* - The Indic shaper requests decomposed output. This will handle splitting
* matra for the Indic shaper.
* - The complex shapers can customize the compose and decompose functions to
* offload some of their requirements to the normalizer. For example, the
* Indic shaper may want to disallow recomposing of two matras.
*
* - We try compatibility decomposition if decomposing through canonical
* decomposition alone failed to find a sequence that the font supports.
* We don't try compatibility decomposition recursively during the canonical
* decomposition phase. This has minimal impact. There are only a handful
* of Greek letter that have canonical decompositions that include characters
* with compatibility decomposition. Those can be found using this command:
*
* egrep "`echo -n ';('; grep ';<' UnicodeData.txt | cut -d';' -f1 | tr '\n' '|'; echo ') '`" UnicodeData.txt
*/
static
void
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