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tdf#43740 Do not use UniscribeLayout for CJK Ideograph Variations.

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It used to use UniscribeLayout when any Unicode varaiation selector
were found, disregard whether it is a Asian or a complex script.
However CJK Ideograph Vairations are better layouted by WinSimpleLayout.

Just check the case, differ based on the base character of the
variation sequence.

Change-Id: I4a2ad160a9ab70a6dbc96c301a6a5ad16e140245
Reviewed-on: https://gerrit.libreoffice.org/29619
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>
Tested-by: Khaled Hosny <khaledhosny@eglug.org>
This commit is contained in:
Mark Hung 2016-10-08 22:18:03 +08:00 committed by Khaled Hosny
parent dcef76b34a
commit bd041161f3
1 changed files with 25 additions and 2 deletions
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27
vcl/source/outdev/text.cxx
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@ -1233,17 +1233,40 @@ ImplLayoutArgs OutputDevice::ImplPrepareLayoutArgs( OUString& rStr,
// disable CTL for non-CTL text
const sal_Unicode* pStr = rStr.getStr() + nMinIndex;
const sal_Unicode* pEnd = rStr.getStr() + nEndIndex;
bool bIsCJKIdeograph = false;
for( ; pStr < pEnd; ++pStr )
{
if (pStr + 1 < pEnd && rtl::isHighSurrogate( *pStr ) )
{
sal_uInt32 nCode = rtl::combineSurrogates( pStr[0] , pStr[1] );
if ( !bIsCJKIdeograph && nCode >= 0xE0100 && nCode < 0xE01F0 ) // Variation Selector Supplements
break;
if ( nCode >= 0x20000 && nCode <= 0x2CEB0 )// CJK Unified Ideographs Extension B-E
bIsCJKIdeograph = true;
++pStr;
continue;
}
if ( ((*pStr >= 0xF900) && (*pStr < 0xFB00)) // CJK Compatibility Ideographs
|| ((*pStr >= 0x3400) && (*pStr < 0xA000)) // CJK Unified Ideographs and Extension A
)
{
bIsCJKIdeograph = true;
continue;
}
if( ((*pStr >= 0x0300) && (*pStr < 0x0370)) // diacritical marks
|| ((*pStr >= 0x0590) && (*pStr < 0x10A0)) // many CTL scripts
|| ((*pStr >= 0x1100) && (*pStr < 0x1200)) // hangul jamo
|| ((*pStr >= 0x1700) && (*pStr < 0x1900)) // many CTL scripts
|| ((*pStr >= 0xFB1D) && (*pStr < 0xFE00)) // middle east presentation
|| ((*pStr >= 0xFE70) && (*pStr < 0xFEFF)) // arabic presentation B
|| ((*pStr >= 0xFE00) && (*pStr < 0xFE10)) // variation selectors in BMP
|| ((pStr + 1 < pEnd) && (pStr[0] == 0xDB40) && (0xDD00 <= pStr[1]) && (pStr[1] < 0xDEF0)) // variation selector supplement
|| (!bIsCJKIdeograph && (*pStr >= 0xFE00) && (*pStr < 0xFE10)) // variation selectors in BMP
)
break;
bIsCJKIdeograph = false;
}
if( pStr >= pEnd )
nLayoutFlags |= SalLayoutFlags::ComplexDisabled;
}