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optimize padding code

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This commit is contained in:
be5invis 2016-05-03 00:26:04 +08:00
parent d71c135c73
commit 8a37a12411
1 changed files with 4 additions and 3 deletions
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7
buildglyphs.ptl
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@ -512,14 +512,15 @@ export as build : define [buildFont para recursive recursiveCodes] : begin
# Note: we use 1000upm in design, and (1000 * upmsacle)upm in production, to avoid rounding error.
let [asc : para.leading * CAP / (CAP - DESCENDER)] [desc : para.leading * DESCENDER / (CAP - DESCENDER)] : begin
local bottomPad : fallback para.linegap 0
set font.head.unitsPerEm 1000
set font.hhea.ascender asc
set font.OS_2.usWinAscent asc
set font.OS_2.sTypoAscender asc
set font.hhea.descender (DESCENDER - para.linegap)
set font.OS_2.usWinDescent ([Math.abs desc] + para.liengap)
set font.OS_2.sTypoDescender (desc - para.liengap)
set font.hhea.descender (DESCENDER - bottomPad)
set font.OS_2.usWinDescent ([Math.abs desc] + bottomPad)
set font.OS_2.sTypoDescender (desc - bottomPad)
set font.hhea.lineGap (para.leading - asc + DESCENDER)
set font.OS_2.sTypoLineGap (para.leading - asc + desc)