int Font::offsetForPositionForSimpleText(const TextRun& run, int x, bool includePartialGlyphs) const
{
float delta = (float)x;
WidthIterator it(this, run);
GlyphBuffer localGlyphBuffer;
unsigned offset;
if (run.rtl()) {
delta -= floatWidthForSimpleText(run, 0);
while (1) {
offset = it.m_currentCharacter;
float w;
if (!it.advanceOneCharacter(w, &localGlyphBuffer))
break;
delta += w;
if (includePartialGlyphs) {
if (delta - w / 2 >= 0)
break;
} else {
if (delta >= 0)
break;
}
}
} else {
while (1) {
offset = it.m_currentCharacter;
float w;
if (!it.advanceOneCharacter(w, &localGlyphBuffer))
break;
delta -= w;
if (includePartialGlyphs) {
if (delta + w / 2 <= 0)
break;
} else {
if (delta <= 0)
break;
}
}
}
return offset;
}
float Font::width(const TextRun& run, int extraCharsAvailable, int& charsConsumed, String& glyphName) const
{
#if !ENABLE(SVG_FONTS)
UNUSED_PARAM(extraCharsAvailable);
#else
if (primaryFont()->isSVGFont())
return floatWidthUsingSVGFont(run, extraCharsAvailable, charsConsumed, glyphName);
#endif
charsConsumed = run.length();
glyphName = "";
#if USE(WRATH)
//return DrawnTextOfWRATH::width(*this, run);
#endif
if (codePath(run) != Complex)
return floatWidthForSimpleText(run, 0);
return floatWidthForComplexText(run);
}
float Font::width(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
{
#if ENABLE(SVG_FONTS)
if (primaryFont()->isSVGFont())
return floatWidthUsingSVGFont(run);
#endif
CodePath codePathToUse = codePath(run);
if (codePathToUse != Complex) {
// If the complex text implementation cannot return fallback fonts, avoid
// returning them for simple text as well.
static bool returnFallbackFonts = canReturnFallbackFontsForComplexText();
return floatWidthForSimpleText(run, 0, returnFallbackFonts ? fallbackFonts : 0, codePathToUse == SimpleWithGlyphOverflow || (glyphOverflow && glyphOverflow->computeBounds) ? glyphOverflow : 0);
}
#if USE(WRATH)
// return DrawnTextOfWRATH::width(*this, run);
#endif
return floatWidthForComplexText(run, fallbackFonts, glyphOverflow);
}
float Font::floatWidthForComplexText(const TextRun& run, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* overflow) const
{
#if USE(FREETYPE)
if (!primaryFont()->platformData().m_pattern)
return floatWidthForSimpleText(run, 0, fallbackFonts, overflow);
#endif
if (!run.length())
return 0.0f;
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 width;
pango_layout_get_pixel_size(layout, &width, 0);
g_free(utf8);
g_object_unref(layout);
return width;
}