diff options
Diffstat (limited to 'src/gui/text/qfontengine.cpp')
| -rw-r--r-- | src/gui/text/qfontengine.cpp | 86 |
1 files changed, 62 insertions, 24 deletions
diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp index dff400c18b..ee74c7f8fb 100644 --- a/src/gui/text/qfontengine.cpp +++ b/src/gui/text/qfontengine.cpp @@ -13,6 +13,7 @@ #include "qpainter.h" #include "qpainterpath.h" #include "qvarlengtharray.h" +#include "qtextengine_p.h" #include <qmath.h> #include <qendian.h> #include <private/qstringiterator_p.h> @@ -429,6 +430,11 @@ void QFontEngine::initializeHeightMetrics() const m_heightMetricsQueried = true; } +bool QFontEngine::preferTypoLineMetrics() const +{ + return (fontDef.styleStrategy & QFont::PreferTypoLineMetrics) != 0; +} + bool QFontEngine::processOS2Table() const { QByteArray os2 = getSfntTable(QFont::Tag("OS/2").value()); @@ -443,7 +449,7 @@ bool QFontEngine::processOS2Table() const enum { USE_TYPO_METRICS = 0x80 }; QFixed unitsPerEm = emSquareSize(); - if (fsSelection & USE_TYPO_METRICS) { + if (preferTypoLineMetrics() || fsSelection & USE_TYPO_METRICS) { // Some fonts may have invalid OS/2 data. We detect this and bail out. if (typoAscent == 0 && typoDescent == 0) return false; @@ -1542,12 +1548,12 @@ glyph_t QFontEngineBox::glyphIndex(uint ucs4) const return 1; } -bool QFontEngineBox::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs, int *nglyphs, QFontEngine::ShaperFlags flags) const +int 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; + return -1; } int ucs4Length = 0; @@ -1563,7 +1569,7 @@ bool QFontEngineBox::stringToCMap(const QChar *str, int len, QGlyphLayout *glyph if (!(flags & GlyphIndicesOnly)) recalcAdvances(glyphs, flags); - return true; + return *nglyphs; } void QFontEngineBox::recalcAdvances(QGlyphLayout *glyphs, QFontEngine::ShaperFlags) const @@ -1793,11 +1799,7 @@ QFontEngine *QFontEngineMulti::loadEngine(int at) glyph_t QFontEngineMulti::glyphIndex(uint ucs4) const { glyph_t glyph = engine(0)->glyphIndex(ucs4); - if (glyph == 0 - && ucs4 != QChar::LineSeparator - && ucs4 != QChar::LineFeed - && ucs4 != QChar::CarriageReturn - && ucs4 != QChar::ParagraphSeparator) { + if (glyph == 0 && !isIgnorableChar(ucs4)) { if (!m_fallbackFamiliesQueried) const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried(); for (int x = 1, n = qMin(m_engines.size(), 256); x < n; ++x) { @@ -1824,13 +1826,55 @@ glyph_t QFontEngineMulti::glyphIndex(uint ucs4) const return glyph; } -bool QFontEngineMulti::stringToCMap(const QChar *str, int len, - QGlyphLayout *glyphs, int *nglyphs, - QFontEngine::ShaperFlags flags) const +int QFontEngineMulti::stringToCMap(const QChar *str, int len, + QGlyphLayout *glyphs, int *nglyphs, + QFontEngine::ShaperFlags flags) const { - if (!engine(0)->stringToCMap(str, len, glyphs, nglyphs, flags)) - return false; + const int originalNumGlyphs = glyphs->numGlyphs; + int mappedGlyphCount = engine(0)->stringToCMap(str, len, glyphs, nglyphs, flags); + if (mappedGlyphCount < 0) + return -1; + + // If ContextFontMerging is set and the match for the string was incomplete, we try all + // fallbacks on the full string until we find the best match. + bool contextFontMerging = mappedGlyphCount < *nglyphs && (fontDef.styleStrategy & QFont::ContextFontMerging); + if (contextFontMerging) { + QVarLengthGlyphLayoutArray tempLayout(len); + if (!m_fallbackFamiliesQueried) + const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried(); + + int maxGlyphCount = 0; + uchar engineIndex = 0; + for (int x = 1, n = qMin(m_engines.size(), 256); x < n; ++x) { + int numGlyphs = len; + const_cast<QFontEngineMulti *>(this)->ensureEngineAt(x); + maxGlyphCount = engine(x)->stringToCMap(str, len, &tempLayout, &numGlyphs, flags); + + // If we found a better match, we copy data into the main QGlyphLayout + if (maxGlyphCount > mappedGlyphCount) { + *nglyphs = numGlyphs; + glyphs->numGlyphs = originalNumGlyphs; + glyphs->copy(&tempLayout); + engineIndex = x; + if (maxGlyphCount == numGlyphs) + break; + } + } + if (engineIndex > 0) { + for (int y = 0; y < glyphs->numGlyphs; ++y) { + if (glyphs->glyphs[y] != 0) + glyphs->glyphs[y] |= (engineIndex << 24); + } + } else { + contextFontMerging = false; + } + + mappedGlyphCount = maxGlyphCount; + } + + // Fill in missing glyphs by going through string one character at the time and finding + // the first viable fallback. int glyph_pos = 0; QStringIterator it(str, str + len); @@ -1861,15 +1905,10 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len, lastFallback = -1; } - if (glyphs->glyphs[glyph_pos] == 0 - && ucs4 != QChar::LineSeparator - && ucs4 != QChar::LineFeed - && ucs4 != QChar::CarriageReturn - && ucs4 != QChar::ParagraphSeparator - && QChar::category(ucs4) != QChar::Other_Control) { + if (glyphs->glyphs[glyph_pos] == 0 && !isIgnorableChar(ucs4)) { if (!m_fallbackFamiliesQueried) const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried(); - for (int x = 1, n = qMin(m_engines.size(), 256); x < n; ++x) { + for (int x = contextFontMerging ? 0 : 1, n = qMin(m_engines.size(), 256); x < n; ++x) { QFontEngine *engine = m_engines.at(x); if (!engine) { if (!shouldLoadFontEngineForCharacter(x, ucs4)) @@ -1946,8 +1985,7 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len, *nglyphs = glyph_pos; glyphs->numGlyphs = glyph_pos; - - return true; + return mappedGlyphCount; } bool QFontEngineMulti::shouldLoadFontEngineForCharacter(int at, uint ucs4) const @@ -2239,7 +2277,7 @@ bool QFontEngineMulti::canRender(const QChar *string, int len) const QGlyphLayout g; g.numGlyphs = nglyphs; g.glyphs = glyphs.data(); - if (!stringToCMap(string, len, &g, &nglyphs, GlyphIndicesOnly)) + if (stringToCMap(string, len, &g, &nglyphs, GlyphIndicesOnly) < 0) Q_UNREACHABLE(); for (int i = 0; i < nglyphs; i++) { |