void UniscribeController::itemizeShapeAndPlace(const UChar* cp, unsigned length, const Font* fontData, GlyphBuffer* glyphBuffer)
{
// ScriptItemize (in Windows XP versions prior to SP2) can overflow by 1. This is why there is an extra empty item
// hanging out at the end of the array
m_items.resize(6);
int numItems = 0;
HRESULT rc = S_OK;
while (rc = ::ScriptItemize(cp, length, m_items.size() - 1, &m_control, &m_state, m_items.data(), &numItems) == E_OUTOFMEMORY) {
m_items.resize(m_items.size() * 2);
resetControlAndState();
}
if (FAILED(rc)) {
WTFLogAlways("UniscribeController::itemizeShapeAndPlace: ScriptItemize failed, rc=%lx", rc);
return;
}
m_items.resize(numItems + 1);
if (m_run.rtl()) {
for (int i = m_items.size() - 2; i >= 0; i--) {
if (!shapeAndPlaceItem(cp, i, fontData, glyphBuffer))
return;
}
} else {
for (unsigned i = 0; i < m_items.size() - 1; i++) {
if (!shapeAndPlaceItem(cp, i, fontData, glyphBuffer))
return;
}
}
}
// FIXME: Rearchitect this to be more like WidthIterator in Font.cpp. Have an advance() method
// that does stuff in that method instead of doing everything in the constructor. Have advance()
// take the GlyphBuffer as an arg so that we don't have to populate the glyph buffer when
// measuring.
UniscribeController::UniscribeController(const Font* font, const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts)
: m_font(*font)
, m_run(run)
, m_fallbackFonts(fallbackFonts)
, m_minGlyphBoundingBoxX(numeric_limits<float>::max())
, m_maxGlyphBoundingBoxX(numeric_limits<float>::min())
, m_minGlyphBoundingBoxY(numeric_limits<float>::max())
, m_maxGlyphBoundingBoxY(numeric_limits<float>::min())
, m_end(run.length())
, m_currentCharacter(0)
, m_runWidthSoFar(0)
, m_padding(run.expansion())
, m_computingOffsetPosition(false)
, m_includePartialGlyphs(false)
, m_offsetX(0)
, m_offsetPosition(0)
{
if (!m_padding)
m_padPerSpace = 0;
else {
float numSpaces = 0;
for (int s = 0; s < m_run.length(); s++) {
if (Font::treatAsSpace(m_run[s]))
numSpaces++;
}
if (numSpaces == 0)
m_padPerSpace = 0;
else
m_padPerSpace = m_padding / numSpaces;
}
// Null out our uniscribe structs
resetControlAndState();
}
// FIXME: Rearchitect this to be more like WidthIterator in Font.cpp. Have an advance() method
// that does stuff in that method instead of doing everything in the constructor. Have advance()
// take the GlyphBuffer as an arg so that we don't have to populate the glyph buffer when
// measuring.
UniscribeController::UniscribeController(const Font* font, const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts)
: m_font(*font)
, m_run(run)
, m_fallbackFonts(fallbackFonts)
, m_end(run.length())
, m_currentCharacter(0)
, m_runWidthSoFar(0)
, m_computingOffsetPosition(false)
, m_includePartialGlyphs(false)
, m_offsetX(0)
, m_offsetPosition(0)
{
m_padding = m_run.padding();
if (!m_padding)
m_padPerSpace = 0;
else {
float numSpaces = 0;
for (int s = 0; s < m_run.length(); s++)
if (Font::treatAsSpace(m_run[s]))
numSpaces++;
if (numSpaces == 0)
m_padPerSpace = 0;
else
m_padPerSpace = ceilf(m_run.padding() / numSpaces);
}
// Null out our uniscribe structs
resetControlAndState();
}
