ComplexTextController::ComplexTextRun::ComplexTextRun(CTRunRef ctRun, const SimpleFontData* fontData, const UChar* characters, unsigned stringLocation, size_t stringLength, CFRange runRange) : m_fontData(fontData) , m_characters(characters) , m_stringLocation(stringLocation) , m_stringLength(stringLength) , m_indexEnd(runRange.location + runRange.length) , m_isMonotonic(true) { m_glyphCount = CTRunGetGlyphCount(ctRun); m_coreTextIndices = CTRunGetStringIndicesPtr(ctRun); if (!m_coreTextIndices) { m_coreTextIndicesVector.grow(m_glyphCount); CTRunGetStringIndices(ctRun, CFRangeMake(0, 0), m_coreTextIndicesVector.data()); m_coreTextIndices = m_coreTextIndicesVector.data(); } m_glyphs = CTRunGetGlyphsPtr(ctRun); if (!m_glyphs) { m_glyphsVector.grow(m_glyphCount); CTRunGetGlyphs(ctRun, CFRangeMake(0, 0), m_glyphsVector.data()); m_glyphs = m_glyphsVector.data(); } m_advances = CTRunGetAdvancesPtr(ctRun); if (!m_advances) { m_advancesVector.grow(m_glyphCount); CTRunGetAdvances(ctRun, CFRangeMake(0, 0), m_advancesVector.data()); m_advances = m_advancesVector.data(); } }
void CoreTextController::adjustGlyphsAndAdvances() { size_t runCount = m_coreTextRuns.size(); for (size_t r = 0; r < runCount; ++r) { const CoreTextRun& coreTextRun = m_coreTextRuns[r]; unsigned glyphCount = coreTextRun.glyphCount(); const SimpleFontData* fontData = coreTextRun.fontData(); Vector<CGGlyph, 256> glyphsVector; const CGGlyph* glyphs; Vector<CGSize, 256> advancesVector; const CGSize* advances; if (coreTextRun.ctRun()) { glyphs = CTRunGetGlyphsPtr(coreTextRun.ctRun()); if (!glyphs) { glyphsVector.grow(glyphCount); CTRunGetGlyphs(coreTextRun.ctRun(), CFRangeMake(0, 0), glyphsVector.data()); glyphs = glyphsVector.data(); } advances = CTRunGetAdvancesPtr(coreTextRun.ctRun()); if (!advances) { advancesVector.grow(glyphCount); CTRunGetAdvances(coreTextRun.ctRun(), CFRangeMake(0, 0), advancesVector.data()); advances = advancesVector.data(); } } else { // Synthesize a run of missing glyphs. glyphsVector.fill(0, glyphCount); glyphs = glyphsVector.data(); advancesVector.fill(CGSizeMake(fontData->widthForGlyph(0), 0), glyphCount); advances = advancesVector.data(); } bool lastRun = r + 1 == runCount; const UChar* cp = coreTextRun.characters(); CGFloat roundedSpaceWidth = roundCGFloat(fontData->m_spaceWidth); bool roundsAdvances = !m_font.isPrinterFont() && fontData->platformData().roundsGlyphAdvances(); bool hasExtraSpacing = (m_font.letterSpacing() || m_font.wordSpacing() || m_padding) && !m_run.spacingDisabled(); for (unsigned i = 0; i < glyphCount; i++) { CFIndex characterIndex = coreTextRun.indexAt(i); UChar ch = *(cp + characterIndex); bool lastGlyph = lastRun && i + 1 == glyphCount; UChar nextCh; if (lastGlyph) nextCh = ' '; else if (i + 1 < glyphCount) nextCh = *(cp + coreTextRun.indexAt(i + 1)); else nextCh = *(m_coreTextRuns[r + 1].characters() + m_coreTextRuns[r + 1].indexAt(0)); bool treatAsSpace = Font::treatAsSpace(ch); CGGlyph glyph = treatAsSpace ? fontData->m_spaceGlyph : glyphs[i]; CGSize advance = treatAsSpace ? CGSizeMake(fontData->m_spaceWidth, advances[i].height) : advances[i]; if (ch == '\t' && m_run.allowTabs()) { float tabWidth = m_font.tabWidth(); advance.width = tabWidth - fmodf(m_run.xPos() + m_totalWidth, tabWidth); } else if (ch == zeroWidthSpace || Font::treatAsZeroWidthSpace(ch) && !treatAsSpace) { advance.width = 0; glyph = fontData->m_spaceGlyph; } float roundedAdvanceWidth = roundf(advance.width); if (roundsAdvances) advance.width = roundedAdvanceWidth; advance.width += fontData->m_syntheticBoldOffset; // We special case spaces in two ways when applying word rounding. // First, we round spaces to an adjusted width in all fonts. // Second, in fixed-pitch fonts we ensure that all glyphs that // match the width of the space glyph have the same width as the space glyph. if (roundedAdvanceWidth == roundedSpaceWidth && (fontData->m_treatAsFixedPitch || glyph == fontData->m_spaceGlyph) && m_run.applyWordRounding()) advance.width = fontData->m_adjustedSpaceWidth; if (hasExtraSpacing) { // If we're a glyph with an advance, go ahead and add in letter-spacing. // That way we weed out zero width lurkers. This behavior matches the fast text code path. if (advance.width && m_font.letterSpacing()) advance.width += m_font.letterSpacing(); // Handle justification and word-spacing. if (glyph == fontData->m_spaceGlyph) { // Account for padding. WebCore uses space padding to justify text. // We distribute the specified padding over the available spaces in the run. if (m_padding) { // Use leftover padding if not evenly divisible by number of spaces. if (m_padding < m_padPerSpace) { advance.width += m_padding; m_padding = 0; } else { advance.width += m_padPerSpace; m_padding -= m_padPerSpace; } } // Account for word-spacing. if (treatAsSpace && characterIndex > 0 && !Font::treatAsSpace(*m_run.data(characterIndex - 1)) && m_font.wordSpacing()) advance.width += m_font.wordSpacing(); } } // Deal with the float/integer impedance mismatch between CG and WebCore. "Words" (characters // followed by a character defined by isRoundingHackCharacter()) are always an integer width. // We adjust the width of the last character of a "word" to ensure an integer width. // Force characters that are used to determine word boundaries for the rounding hack // to be integer width, so the following words will start on an integer boundary. if (m_run.applyWordRounding() && Font::isRoundingHackCharacter(ch)) advance.width = ceilCGFloat(advance.width); // Check to see if the next character is a "rounding hack character", if so, adjust the // width so that the total run width will be on an integer boundary. if (m_run.applyWordRounding() && !lastGlyph && Font::isRoundingHackCharacter(nextCh) || m_run.applyRunRounding() && lastGlyph) { CGFloat totalWidth = m_totalWidth + advance.width; CGFloat extraWidth = ceilCGFloat(totalWidth) - totalWidth; if (m_run.ltr()) advance.width += extraWidth; else { m_totalWidth += extraWidth; if (m_lastRoundingGlyph) m_adjustedAdvances[m_lastRoundingGlyph - 1].width += extraWidth; else m_finalRoundingWidth = extraWidth; m_lastRoundingGlyph = m_adjustedAdvances.size() + 1; } } m_totalWidth += advance.width; advance.height *= -1; m_adjustedAdvances.append(advance); m_adjustedGlyphs.append(glyph); } } }