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);
}
}
}