void SimpleFontData::platformInit()
{
FS_FIXED ascender = 0;
FS_FIXED descender = 0;
FS_FIXED leading = 0;
FsAscDescLeadSource source;
FS_LONG result;
if (m_platformData.size() > 0) {
// FIXME: hack! FS_get_ascender_descender_leading() returns ERR_NO_CURRENT_SFNT when size is 0, even though we called FS_set_scale and m_platformData.font()->cur_sfnt is not 0
result = FS_get_ascender_descender_leading(m_platformData.font(), &ascender, &descender, &leading, &source);
ASSERT_UNUSED(result, result == SUCCESS);
}
m_fontMetrics.setAscent(FS_ROUND(ascender));
m_fontMetrics.setDescent(FS_ROUND(descender));
m_fontMetrics.setLineGap(iTypeFixedToFloat(leading));
m_fontMetrics.setLineSpacing(lroundf(m_fontMetrics.ascent()) + lroundf(m_fontMetrics.descent()) + lroundf(m_fontMetrics.lineGap()));
FONT_METRICS metrics;
result = FS_font_metrics(m_platformData.font(), &metrics);
ASSERT_UNUSED(result, result == SUCCESS);
// m_fontMetrics.setUnitsPerEm(FS_get_design_units(m_platformData().font()));
m_fontMetrics.setUnitsPerEm(metrics.unitsPerEm);
FS_USHORT xRange = metrics.font_bbox.xMax - metrics.font_bbox.xMin;
m_maxCharWidth = roundf((xRange * roundf(m_platformData.size())) / metrics.unitsPerEm);
TTF_OS2 os2;
if (FS_get_table_structure(m_platformData.font(), TAG_OS2, &os2) == SUCCESS && os2.sxHeight && os2.xAvgCharWidth) {
FS_USHORT yppem = m_platformData.font()->lpm;
m_fontMetrics.setXHeight(static_cast<float>(os2.sxHeight) * yppem / metrics.unitsPerEm);
m_avgCharWidth = static_cast<float>(os2.xAvgCharWidth) * yppem / metrics.unitsPerEm;
} else {
// HACK
m_fontMetrics.setXHeight(m_fontMetrics.ascent() * 0.56);
m_fontMetrics.setHasXHeight(false);
m_avgCharWidth = m_fontMetrics.xHeight();
GlyphPage* glyphPageZero = GlyphPageTreeNode::getRootChild(this, 0)->page();
if (glyphPageZero) {
static const UChar32 xChar = 'x';
const Glyph xGlyph = glyphPageZero->glyphDataForCharacter(xChar).glyph;
if (xGlyph) {
// In widthForGlyph(), xGlyph will be compared with
// m_zeroWidthSpaceGlyph, which isn't initialized yet here.
// Initialize it with zero to make sure widthForGlyph() returns
// the right width.
m_zeroWidthSpaceGlyph = 0;
m_avgCharWidth = widthForGlyph(xGlyph);
}
}
}
if (m_platformData.orientation() == Vertical && !isTextOrientationFallback())
m_hasVerticalGlyphs = FS_get_table(m_platformData.font(), openTypeTag('v', 'h', 'e', 'a'), TBL_QUERY, 0)
|| FS_get_table(m_platformData.font(), openTypeTag('V', 'O', 'R', 'G'), TBL_QUERY, 0);
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
FS_SHORT idx, idy;
FS_FIXED dx, dy;
if (FS_get_advance(m_platformData.font(), glyph, FS_MAP_DISTANCEFIELD | FS_MAP_GRAYMAP8, &idx, &idy, &dx, &dy) != SUCCESS)
return 0;
return iTypeFixedToFloat(dx);
}
float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
{
FS_SHORT idx, idy;
FS_FIXED dx, dy;
FS_FIXED s00, s01, s10, s11;
bool needsFakeBoldReset = m_platformData.syntheticBold() && m_treatAsFixedPitch;
if (needsFakeBoldReset) {
FS_get_scale(m_platformData.font(), &s00, &s01, &s10, &s11);
FS_set_bold_pct(m_platformData.font(), 0);
FS_set_scale(m_platformData.font(), s00, s01, s10, s11);
}
if (FS_get_advance(m_platformData.font(), glyph, FS_MAP_DISTANCEFIELD | FS_MAP_GRAYMAP8, &idx, &idy, &dx, &dy) != SUCCESS)
dx = 0;
if (needsFakeBoldReset) {
FS_set_bold_pct(m_platformData.font(), ITYPEFAKEBOLDAMOUNT);
FS_set_scale(m_platformData.font(), s00, s01, s10, s11);
}
return iTypeFixedToFloat(dx);
}
