int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool includePartialGlyphs) const
{
#if USE(FREETYPE)
if (!primaryFont()->platformData().m_pattern)
return offsetForPositionForSimpleText(run, xFloat, includePartialGlyphs);
#endif
// FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers
// to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem.
int x = static_cast<int>(xFloat);
PangoLayout* layout = getDefaultPangoLayout(run);
setPangoAttributes(this, run, layout);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
int index, trailing;
pango_layout_xy_to_index(layout, x * PANGO_SCALE, 1, &index, &trailing);
glong offset = g_utf8_pointer_to_offset(utf8, utf8 + index);
if (includePartialGlyphs)
offset += trailing;
g_free(utf8);
g_object_unref(layout);
return offset;
}
int Font::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const
{
if (codePath(run) != Complex)
return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, x, includePartialGlyphs);
}
int Font::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const
{
// FIXME: Use the fast code path once it handles partial runs with kerning and ligatures. See http://webkit.org/b/100050
if (codePath(run) != Complex && !typesettingFeatures())
return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, x, includePartialGlyphs);
}
int Font::offsetForPositionForComplexText(const TextRun& run, float xFloat, bool includePartialGlyphs) const
{
// FIXME: This truncation is not a problem for HTML, but only affects SVG, which passes floating-point numbers
// to Font::offsetForPosition(). Bug http://webkit.org/b/40673 tracks fixing this problem.
int position = static_cast<int>(xFloat);
TextRunComponents components;
int w = generateComponents(&components, *this, run);
if (position >= w)
return run.length();
int offset = 0;
if (run.rtl()) {
for (size_t i = 0; i < components.size(); ++i) {
const TextRunComponent& comp = components.at(i);
int xe = w - comp.m_offset;
int xs = xe - comp.m_width;
if (position >= xs)
return offset + (comp.isSpace()
? static_cast<int>((position - xe) * comp.m_spaces / std::max(1.f, comp.m_width) + 0.5)
: offsetForPositionForSimpleText(comp.m_textRun, position - xs, includePartialGlyphs));
offset += comp.textLength();
}
} else {
for (size_t i = 0; i < components.size(); ++i) {
const TextRunComponent& comp = components.at(i);
int xs = comp.m_offset;
int xe = xs + comp.m_width;
if (position <= xe) {
if (position - xs >= xe)
return offset + comp.textLength();
return offset + (comp.isSpace()
? static_cast<int>((position - xs) * comp.m_spaces / std::max(1.f, comp.m_width) + 0.5)
: offsetForPositionForSimpleText(comp.m_textRun, position - xs, includePartialGlyphs));
}
offset += comp.textLength();
}
}
return run.length();
}
int Font::offsetForPosition(const TextRun& run, int x, bool includePartialGlyphs) const
{
#if ENABLE(SVG_FONTS)
if (primaryFont()->isSVGFont())
return offsetForPositionForTextUsingSVGFont(run, x, includePartialGlyphs);
#endif
if (canUseGlyphCache(run))
return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, x, includePartialGlyphs);
}
int Font::offsetForPosition(const TextRun& run, float x, bool includePartialGlyphs) const
{
#if ENABLE(SVG_FONTS)
if (primaryFont()->isSVGFont())
return offsetForPositionForTextUsingSVGFont(run, x, includePartialGlyphs);
#endif
#if USE(WRATH)
//return DrawnTextOfWRATH::offsetForPosition(*this, run, x, includePartialGlyphs);
#endif
if (codePath(run) != Complex)
return offsetForPositionForSimpleText(run, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, x, includePartialGlyphs);
}
int Font::offsetForPosition(const TextRun& run, const TextStyle& style, int x, bool includePartialGlyphs) const
{
if (canUseGlyphCache(run))
return offsetForPositionForSimpleText(run, style, x, includePartialGlyphs);
return offsetForPositionForComplexText(run, style, x, includePartialGlyphs);
}