TextRunWalker(const TextRun& run, unsigned startingX, const Font* font)
: m_font(font)
, m_startingX(startingX)
, m_offsetX(m_startingX)
, m_run(getTextRun(run))
, m_iterateBackwards(m_run.rtl())
{
// Do not use |run| inside this constructor. Use |m_run| instead.
memset(&m_item, 0, sizeof(m_item));
// We cannot know, ahead of time, how many glyphs a given script run
// will produce. We take a guess that script runs will not produce more
// than twice as many glyphs as there are code points and fallback if
// we find that we are wrong.
m_maxGlyphs = m_run.length() * 2;
createGlyphArrays();
m_item.log_clusters = new unsigned short[m_run.length()];
m_item.face = 0;
m_item.font = allocHarfbuzzFont();
m_item.string = m_run.characters();
m_item.stringLength = m_run.length();
m_item.item.bidiLevel = m_run.rtl();
reset();
}
TextRunWalker(const TextRun& run, unsigned startingX, const Font* font)
: m_font(font)
, m_startingX(startingX)
, m_offsetX(m_startingX)
, m_run(getTextRun(run))
, m_iterateBackwards(m_run.rtl())
, m_wordSpacingAdjustment(0)
, m_padding(0)
, m_padError(0)
{
// Do not use |run| inside this constructor. Use |m_run| instead.
memset(&m_item, 0, sizeof(m_item));
// We cannot know, ahead of time, how many glyphs a given script run
// will produce. We take a guess that script runs will not produce more
// than twice as many glyphs as there are code points plus a bit of
// padding and fallback if we find that we are wrong.
createGlyphArrays((m_run.length() + 2) * 2);
m_item.log_clusters = new unsigned short[m_run.length()];
m_item.face = 0;
m_item.font = allocHarfbuzzFont();
m_item.item.bidiLevel = m_run.rtl();
int length = m_run.length();
m_item.stringLength = length;
if (!m_item.item.bidiLevel)
m_item.string = m_run.characters();
else {
// Assume mirrored character is in the same Unicode multilingual plane as the original one.
UChar* string = new UChar[length];
mirrorCharacters(string, m_run.characters(), length);
m_item.string = string;
}
reset();
}