diff options
Diffstat (limited to 'vcl/win')
| -rw-r--r-- | vcl/win/source/gdi/winlayout.cxx | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/vcl/win/source/gdi/winlayout.cxx b/vcl/win/source/gdi/winlayout.cxx index 7fab9292f41b..51db718e72e2 100644 --- a/vcl/win/source/gdi/winlayout.cxx +++ b/vcl/win/source/gdi/winlayout.cxx @@ -415,12 +415,19 @@ bool SimpleWinLayout::LayoutText( ImplLayoutArgs& rArgs ) bool bSurrogate = ((nCharCode >= 0xD800) && (nCharCode <= 0xDFFF)); if( bSurrogate ) { - if( nCharCode >= 0xDC00 ) // this part of a surrogate pair was already processed + // ignore high surrogates, they were already processed with their low surrogates + if( nCharCode >= 0xDC00 ) continue; - nCharCode = 0x10000 + ((pCodes[0] - 0xD800) << 10) + (pCodes[1] - 0xDC00); - } + // check the second half of the surrogate pair + bSurrogate &= (0xDC00 <= pCodes[1]) && (pCodes[1] <= 0xDFFF); + // calculate the UTF-32 code of valid surrogate pairs + if( bSurrogate ) + nCharCode = 0x10000 + ((pCodes[0] - 0xD800) << 10) + (pCodes[1] - 0xDC00); + else // or fall back to a replacement character + nCharCode = '?'; + } - // get the advance width for the current UCS-4 code point + // get the advance width for the current UTF-32 code point int nGlyphWidth = mrWinFontEntry.GetCachedGlyphWidth( nCharCode ); if( nGlyphWidth == -1 ) { @@ -438,7 +445,7 @@ bool SimpleWinLayout::LayoutText( ImplLayoutArgs& rArgs ) mpGlyphAdvances[ i ] = nGlyphWidth; mnWidth += nGlyphWidth; - // remaining codes of surrogate pair get a zero width + // the second half of surrogate pair gets a zero width if( bSurrogate && ((i+1) < mnGlyphCount) ) mpGlyphAdvances[ i+1 ] = 0; |