diff options
Diffstat (limited to 'src/gui/text/qfontengine.cpp')
| -rw-r--r-- | src/gui/text/qfontengine.cpp | 221 |
1 files changed, 112 insertions, 109 deletions
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp index 83e64a51a6..a72ac23418 100644 --- a/src/gui/text/qfontengine.cpp +++ b/src/gui/text/qfontengine.cpp @@ -101,35 +101,13 @@ static HB_Bool hb_stringToGlyphs(HB_Font font, const HB_UChar16 *string, hb_uint *numGlyphs = nGlyphs; if (rightToLeft && result && !fe->symbol) { - uint glyph_pos = 0; - for (uint i = 0; i < length; ++i, ++glyph_pos) { - uint ucs4 = str[i].unicode(); - if (Q_UNLIKELY(QChar::isHighSurrogate(ucs4) && i + 1 < length)) { - uint low = str[i + 1].unicode(); - if (Q_LIKELY(QChar::isLowSurrogate(low))) { - ucs4 = QChar::surrogateToUcs4(ucs4, low); - ++i; - } - } - - uint mirrored = QChar::mirroredChar(ucs4); - if (Q_UNLIKELY(mirrored != ucs4)) { - QChar chars[2]; - uint numChars = 0; - if (Q_UNLIKELY(QChar::requiresSurrogates(mirrored))) { - chars[numChars++] = QChar(QChar::highSurrogate(mirrored)); - chars[numChars++] = QChar(QChar::lowSurrogate(mirrored)); - } else { - chars[numChars++] = QChar(mirrored); - } - - qglyphs.numGlyphs = numChars; - qglyphs.glyphs = glyphs + glyph_pos; - nGlyphs = numChars; - if (!fe->stringToCMap(chars, numChars, &qglyphs, &nGlyphs, QFontEngine::GlyphIndicesOnly)) - Q_UNREACHABLE(); - Q_ASSERT(nGlyphs == 1); - } + QStringIterator it(str, str + length); + while (it.hasNext()) { + const uint ucs4 = it.next(); + const uint mirrored = QChar::mirroredChar(ucs4); + if (Q_UNLIKELY(mirrored != ucs4)) + *glyphs = fe->glyphIndex(mirrored); + ++glyphs; } } @@ -242,8 +220,8 @@ Q_AUTOTEST_EXPORT QList<QFontEngine *> QFontEngine_stopCollectingEngines() // QFontEngine -QFontEngine::QFontEngine() - : ref(0), +QFontEngine::QFontEngine(Type type) + : m_type(type), ref(0), font_(0), font_destroy_func(0), face_(0), face_destroy_func(0) { @@ -359,6 +337,15 @@ bool QFontEngine::supportsScript(QChar::Script script) const return true; } +#ifdef Q_OS_MAC + { + // in AAT fonts, 'gsub' table is effectively replaced by 'mort'/'morx' table + uint len; + if (getSfntTableData(MAKE_TAG('m','o','r','t'), 0, &len) || getSfntTableData(MAKE_TAG('m','o','r','x'), 0, &len)) + return true; + } +#endif + #ifdef QT_ENABLE_HARFBUZZ_NG if (useHarfbuzzNG) { bool ret = false; @@ -385,6 +372,17 @@ bool QFontEngine::supportsScript(QChar::Script script) const return hbFace->supported_scripts[script_to_hbscript(script)]; } +bool QFontEngine::canRender(const QChar *str, int len) const +{ + QStringIterator it(str, str + len); + while (it.hasNext()) { + if (glyphIndex(it.next()) == 0) + return false; + } + + return true; +} + glyph_metrics_t QFontEngine::boundingBox(glyph_t glyph, const QTransform &matrix) { glyph_metrics_t metrics = boundingBox(glyph); @@ -397,38 +395,14 @@ glyph_metrics_t QFontEngine::boundingBox(glyph_t glyph, const QTransform &matrix QFixed QFontEngine::xHeight() const { - QChar x((ushort)'x'); - - glyph_t glyph; - - QGlyphLayout glyphs; - glyphs.numGlyphs = 1; - glyphs.glyphs = &glyph; - - int nglyphs = 1; - if (!stringToCMap(&x, 1, &glyphs, &nglyphs, GlyphIndicesOnly)) - Q_UNREACHABLE(); - Q_ASSERT(nglyphs == 1); - + const glyph_t glyph = glyphIndex('x'); glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyph); return bb.height; } QFixed QFontEngine::averageCharWidth() const { - QChar x((ushort)'x'); - - glyph_t glyph; - - QGlyphLayout glyphs; - glyphs.numGlyphs = 1; - glyphs.glyphs = &glyph; - - int nglyphs = 1; - if (!stringToCMap(&x, 1, &glyphs, &nglyphs, GlyphIndicesOnly)) - Q_UNREACHABLE(); - Q_ASSERT(nglyphs == 1); - + const glyph_t glyph = glyphIndex('x'); glyph_metrics_t bb = const_cast<QFontEngine *>(this)->boundingBox(glyph); return bb.xoff; } @@ -489,18 +463,14 @@ void QFontEngine::getGlyphPositions(const QGlyphLayout &glyphs, const QTransform if (glyphs.justifications[i].nKashidas) { QChar ch(0x640); // Kashida character - glyph_t kashidaGlyph; + glyph_t kashidaGlyph = glyphIndex(ch.unicode()); QFixed kashidaWidth; QGlyphLayout g; g.numGlyphs = 1; g.glyphs = &kashidaGlyph; g.advances = &kashidaWidth; - - int nglyphs = 1; - if (!stringToCMap(&ch, 1, &g, &nglyphs, 0)) - Q_UNREACHABLE(); - Q_ASSERT(nglyphs == 1); + recalcAdvances(&g, 0); for (uint k = 0; k < glyphs.justifications[i].nKashidas; ++k) { xpos -= kashidaWidth; @@ -937,14 +907,31 @@ void QFontEngine::getUnscaledGlyph(glyph_t glyph, QPainterPath *path, glyph_metr addGlyphsToPath(&glyph, &p, 1, path, QFlag(0)); } +/*! + Returns \c true if the font table idetified by \a tag exists in the font; + returns \c false otherwise. + + If \a buffer is NULL, stores the size of the buffer required for the font table data, + in bytes, in \a length. If \a buffer is not NULL and the capacity + of the buffer, passed in \a length, is sufficient to store the font table data, + also copies the font table data to \a buffer. + + Note: returning \c false when the font table exists could lead to an undefined behavior. +*/ +bool QFontEngine::getSfntTableData(uint tag, uchar *buffer, uint *length) const +{ + Q_UNUSED(tag) + Q_UNUSED(buffer) + Q_UNUSED(length) + return false; +} + QByteArray QFontEngine::getSfntTable(uint tag) const { QByteArray table; uint len = 0; if (!getSfntTableData(tag, 0, &len)) return table; - if (!len) - return table; table.resize(len); if (!getSfntTableData(tag, reinterpret_cast<uchar *>(table.data()), &len)) return QByteArray(); @@ -1382,7 +1369,15 @@ QFontEngine::GlyphCacheEntry &QFontEngine::GlyphCacheEntry::operator=(const Glyp // ------------------------------------------------------------------ QFontEngineBox::QFontEngineBox(int size) - : _size(size) + : QFontEngine(Box), + _size(size) +{ + cache_cost = sizeof(QFontEngineBox); +} + +QFontEngineBox::QFontEngineBox(Type type, int size) + : QFontEngine(type), + _size(size) { cache_cost = sizeof(QFontEngineBox); } @@ -1391,8 +1386,15 @@ QFontEngineBox::~QFontEngineBox() { } +glyph_t QFontEngineBox::glyphIndex(uint ucs4) const +{ + Q_UNUSED(ucs4) + return 0; +} + bool QFontEngineBox::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const { + Q_ASSERT(glyphs->numGlyphs >= *nglyphs); if (*nglyphs < len) { *nglyphs = len; return false; @@ -1503,22 +1505,11 @@ qreal QFontEngineBox::maxCharWidth() const return _size; } - -const char *QFontEngineBox::name() const -{ - return "null"; -} - -bool QFontEngineBox::canRender(const QChar *, int) +bool QFontEngineBox::canRender(const QChar *, int) const { return true; } -QFontEngine::Type QFontEngineBox::type() const -{ - return Box; -} - QImage QFontEngineBox::alphaMapForGlyph(glyph_t) { QImage image(_size, _size, QImage::Format_Indexed8); @@ -1550,6 +1541,7 @@ static inline glyph_t stripped(glyph_t glyph) { return glyph & 0x00ffffff; } QFontEngineMulti::QFontEngineMulti(int engineCount) + : QFontEngine(Multi) { engines.fill(0, engineCount); cache_cost = 0; @@ -1564,6 +1556,35 @@ QFontEngineMulti::~QFontEngineMulti() } } +glyph_t QFontEngineMulti::glyphIndex(uint ucs4) const +{ + glyph_t glyph = engine(0)->glyphIndex(ucs4); + if (glyph == 0 && ucs4 != QChar::LineSeparator) { + const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried(); + for (int x = 1, n = qMin(engines.size(), 256); x < n; ++x) { + QFontEngine *engine = engines.at(x); + if (!engine) { + if (!shouldLoadFontEngineForCharacter(x, ucs4)) + continue; + const_cast<QFontEngineMulti *>(this)->loadEngine(x); + engine = engines.at(x); + } + Q_ASSERT(engine != 0); + if (engine->type() == Box) + continue; + + glyph = engine->glyphIndex(ucs4); + if (glyph != 0) { + // set the high byte to indicate which engine the glyph came from + glyph |= (x << 24); + break; + } + } + } + + return glyph; +} + bool QFontEngineMulti::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const @@ -1573,13 +1594,10 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len, const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried(); int glyph_pos = 0; - for (int i = 0; i < len; ++i) { - bool surrogate = (str[i].isHighSurrogate() && i < len-1 && str[i+1].isLowSurrogate()); - uint ucs4 = surrogate ? QChar::surrogateToUcs4(str[i], str[i+1]) : str[i].unicode(); - if (glyphs->glyphs[glyph_pos] == 0 && str[i].category() != QChar::Separator_Line) { - QFixed tmpAdvance; - if (!(flags & GlyphIndicesOnly)) - tmpAdvance = glyphs->advances[glyph_pos]; + QStringIterator it(str, str + len); + while (it.hasNext()) { + const uint ucs4 = it.peekNext(); + if (glyphs->glyphs[glyph_pos] == 0 && ucs4 != QChar::LineSeparator) { for (int x = 1, n = qMin(engines.size(), 256); x < n; ++x) { if (engines.at(x) == 0 && !shouldLoadFontEngineForCharacter(x, ucs4)) continue; @@ -1593,27 +1611,21 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len, if (engine->type() == Box) continue; - if (!(flags & GlyphIndicesOnly)) - glyphs->advances[glyph_pos] = QFixed(); - int num = 2; - QGlyphLayout g = glyphs->mid(glyph_pos, num); - if (!engine->stringToCMap(str + i, surrogate ? 2 : 1, &g, &num, flags)) - Q_UNREACHABLE(); - Q_ASSERT(num == 1); - if (glyphs->glyphs[glyph_pos]) { + glyph_t glyph = engine->glyphIndex(ucs4); + if (glyph != 0) { + glyphs->glyphs[glyph_pos] = glyph; + if (!(flags & GlyphIndicesOnly)) { + QGlyphLayout g = glyphs->mid(glyph_pos, 1); + engine->recalcAdvances(&g, flags); + } // set the high byte to indicate which engine the glyph came from glyphs->glyphs[glyph_pos] |= (x << 24); break; } } - - // ensure we use metrics from the 1st font when we use the fallback image. - if (!(flags & GlyphIndicesOnly) && glyphs->glyphs[glyph_pos] == 0) - glyphs->advances[glyph_pos] = tmpAdvance; } - if (surrogate) - ++i; + it.advance(); ++glyph_pos; } @@ -1898,7 +1910,7 @@ qreal QFontEngineMulti::minRightBearing() const return engine(0)->minRightBearing(); } -bool QFontEngineMulti::canRender(const QChar *string, int len) +bool QFontEngineMulti::canRender(const QChar *string, int len) const { if (engine(0)->canRender(string, len)) return true; @@ -1959,13 +1971,4 @@ QImage QFontEngineMulti::alphaRGBMapForGlyph(glyph_t glyph, QFixed subPixelPosit return engine(which)->alphaRGBMapForGlyph(stripped(glyph), subPixelPosition, t); } -QTestFontEngine::QTestFontEngine(int size) - : QFontEngineBox(size) -{} - -QFontEngine::Type QTestFontEngine::type() const -{ - return TestFontEngine; -} - QT_END_NAMESPACE |