Author: hdu
Date: Tue May 20 12:00:50 2014
New Revision: 1596218
URL: http://svn.apache.org/r1596218
Log:
#i124935# fix expanded/condensed text breaking in the CoreText engine
the concept of an extra-width per code-unit was obsolete at least since apps
supported unicode with its different normalization forms, diacritical marks,
surrogate-pairs, non-printing characters such as ZWJ/ZWNJ/RLM, etc. so of
course modern engines like CoreText don't aid this typographical crime.
The fix here extends the CTLayout::GetTextBreak() method to handle the obsolete
semantic of per code-unit extra-widths by successively approximating the number
of involved code-units.
Modified:
openoffice/trunk/main/vcl/aqua/source/gdi/ctlayout.cxx
Modified: openoffice/trunk/main/vcl/aqua/source/gdi/ctlayout.cxx
URL:
http://svn.apache.org/viewvc/openoffice/trunk/main/vcl/aqua/source/gdi/ctlayout.cxx?rev=1596218&r1=1596217&r2=1596218&view=diff
==============================================================================
--- openoffice/trunk/main/vcl/aqua/source/gdi/ctlayout.cxx (original)
+++ openoffice/trunk/main/vcl/aqua/source/gdi/ctlayout.cxx Tue May 20 12:00:50
2014
@@ -451,13 +451,35 @@ int CTLayout::GetTextBreak( long nMaxWid
return STRING_LEN;
CTTypesetterRef aCTTypeSetter = CTTypesetterCreateWithAttributedString(
mpAttrString );
- const double fCTMaxWidth = (double)nMaxWidth / (nFactor * mfFontScale);
- CFIndex nIndex = CTTypesetterSuggestClusterBreak( aCTTypeSetter, 0,
fCTMaxWidth );
- if( nIndex >= mnCharCount )
- return STRING_LEN;
- nIndex += mnMinCharPos;
- return (int)nIndex;
+ CFIndex nBestGuess = (nCharExtra >= 0) ? 0 : mnCharCount;
+ for( int i = 1; i <= mnCharCount; i *= 2 )
+ {
+ // guess the target width considering char-extra
expansion/condensation
+ const long nTargetWidth = nMaxWidth - nBestGuess * nCharExtra;
+ const double fCTMaxWidth = nTargetWidth / (nFactor *
mfFontScale);
+ // calculate the breaking index for the guessed target width
+ const CFIndex nNewIndex = CTTypesetterSuggestClusterBreak(
aCTTypeSetter, 0, fCTMaxWidth );
+ if( nNewIndex >= mnCharCount ) {
+ CFRelease( aCTTypeSetter );
+ return STRING_LEN;
+ }
+ // check if the original extra-width guess was good
+ if( !nCharExtra )
+ nBestGuess = nNewIndex;
+ if( nBestGuess == nNewIndex )
+ break;
+ // prepare another round for a different number of characters
+ CFIndex nNewGuess = (nNewIndex + nBestGuess + 1) / 2;
+ if( nNewGuess == nBestGuess )
+ nNewGuess += (nNewIndex > nBestGuess) ? +1 : -1;
+ nBestGuess = nNewGuess;
+ }
+
+ // suggest the best fitting cluster break as breaking position
+ CFRelease( aCTTypeSetter );
+ const int nIndex = nBestGuess + mnMinCharPos;
+ return nIndex;
}
// -----------------------------------------------------------------------
