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Fix surrogate pair handling in QCoreTextFontEngine

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The number of glyphs returned should take surrogate pairs into account.
The glyphs array and advances array as well. This follows the approach
in QFontEngineFT in general.

Change-Id: Ic53faa5e38c2219b987d76aec434558dad92015a
Reviewed-by: Zeno Albisser <zeno.albisser@nokia.com>
This commit is contained in:
Jiang Jiang 2012-05-18 16:00:55 +02:00 committed by Qt by Nokia
parent 9149aebac9
commit b4aa5d970d
1 changed files with 31 additions and 5 deletions
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36
src/platformsupport/fontdatabases/mac/qfontengine_coretext.mm
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@ -190,20 +190,46 @@ void QCoreTextFontEngine::init()
bool QCoreTextFontEngine::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs,
int *nglyphs, QTextEngine::ShaperFlags flags) const
{
*nglyphs = len;
QCFType<CFStringRef> cfstring;
QVarLengthArray<CGGlyph> cgGlyphs(len);
CTFontGetGlyphsForCharacters(ctfont, (const UniChar*)str, cgGlyphs.data(), len);
for (int i = 0; i < len; ++i)
if (cgGlyphs[i])
glyphs->glyphs[i] = cgGlyphs[i];
int glyph_pos = 0;
for (int i = 0; i < len; ++i) {
if (cgGlyphs[i]) {
glyphs->glyphs[glyph_pos] = cgGlyphs[i];
if (glyph_pos < i)
cgGlyphs[glyph_pos] = cgGlyphs[i];
}
glyph_pos++;
// If it's a non-BMP char, skip the lower part of surrogate pair and go
// directly to the next char without increasing glyph_pos
if (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate())
++i;
}
*nglyphs = glyph_pos;
if (flags & QTextEngine::GlyphIndicesOnly)
return true;
loadAdvancesForGlyphs(ctfont, cgGlyphs, glyphs, len, flags, fontDef);
QVarLengthArray<CGSize> advances(glyph_pos);
CTFontGetAdvancesForGlyphs(ctfont, kCTFontHorizontalOrientation, cgGlyphs.data(), advances.data(), glyph_pos);
for (int i = 0; i < glyph_pos; ++i) {
if (glyphs->glyphs[i] & 0xff000000)
continue;
glyphs->advances_x[i] = QFixed::fromReal(advances[i].width);
glyphs->advances_y[i] = QFixed::fromReal(advances[i].height);
}
if (fontDef.styleStrategy & QFont::ForceIntegerMetrics) {
for (int i = 0; i < glyph_pos; ++i) {
glyphs->advances_x[i] = glyphs->advances_x[i].round();
glyphs->advances_y[i] = glyphs->advances_y[i].round();
}
}
return true;
}