|
Apple Advanced Typography (AAT) is Apple Inc.'s computer software for advanced font rendering, supporting internationalization and complex features for typographers, a successor to Apple's little-used QuickDraw GX font technology of the mid-1990s. It is a set of extensions to the TrueType outline font standard, with smartfont features similar to the OpenType font format that was developed by Adobe and Microsoft, and the open source Graphite. It also incorporates concepts from Adobe's "multiple master" font format, allowing for axes of traits to be defined and morphing of a glyph independently along each of these axes. AAT font features do not alter the underlying typed text; they only affect the characters' representation during glyph conversion. == Features == Significant features of AAT currently include: * Several degrees of ligature control * Kashida justification and joiners * Cross-stream kerning (required for Nasta'liq Urdu, for example) * Indic vowel rearrangement * Independently controllable substitution of: * * Old style figures * * Small caps and drop caps * * Swash variants * * Alternative glyphs: * * * Individual alternatives on a per-glyph basis * * * Wholesale alternatives, such as engraved text * * Anything else the font designer wants to add * Glyph variation axes AAT font features are supported on Mac OS 8.5 and above, including OS X. The cross-platform ICU library provide basic AAT support for left-to-right scripts.〔(ICU Layout Engine – Overview )〕 As of OS X Yosemite and iOS 8, AAT supports language-specific shaping—that is, changing how glyphs are processed depending on the human language they are being used to represent. This support is available through the use of language tags in Core Text.〔https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ltag.html〕 Provision was added at the same time for the relative positioning of two glyphs via anchor points via the ‘kerx’ and ‘ankr’ tables.〔https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6ankr.html〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Apple Advanced Typography」の詳細全文を読む スポンサード リンク
|