int FontPlatformData::emSizeInFontUnits() const
{
if (m_emSizeInFontUnits)
return m_emSizeInFontUnits;
SkAdvancedTypefaceMetrics* metrics = m_typeface->getAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo);
m_emSizeInFontUnits = metrics->fEmSize;
metrics->unref();
return m_emSizeInFontUnits;
}
int FontPlatformData::emSizeInFontUnits() const
{
if (mEmSizeInFontUnits)
return mEmSizeInFontUnits;
SkAdvancedTypefaceMetrics* metrics = 0;
if (mTypeface)
metrics = mTypeface->getAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo);
if (metrics) {
mEmSizeInFontUnits = metrics->fEmSize;
metrics->unref();
} else
mEmSizeInFontUnits = 1000; // default value copied from Skia.
return mEmSizeInFontUnits;
}
void runTest(skiatest::Reporter* reporter) {
SkAdvancedTypefaceMetrics metrics;
metrics.setGlyphWidths(
fAdvancesLen, fSubset, fSubsetLen,
std::function<bool(int, int16_t*)>([this](int gId, int16_t* advance) {
if (gId >= 0 && gId < fAdvancesLen) {
*advance = fAdvances[gId];
return true;
}
return false;
}));
SkString stringResult = stringify_advance_data(metrics.fGlyphWidths);
if (!stringResult.equals(fExpected)) {
ERRORF(reporter, "Expected: %s\n Result: %s\n", fExpected, stringResult.c_str());
}
}
int FontPlatformData::emSizeInFontUnits() const
{
if (m_emSizeInFontUnits)
return m_emSizeInFontUnits;
// FIXME: Switch to the SkTypeface::GetUnitsPerEm API once this becomes available.
// https://bugs.webkit.org/show_bug.cgi?id=75961
#if OS(ANDROID)
// Android doesn't currently support Skia's getAdvancedTypefaceMetrics(),
// but it has access to another method to replace this functionality.
m_emSizeInFontUnits = SkFontHost::GetUnitsPerEm(m_typeface->uniqueID());
#else
SkAdvancedTypefaceMetrics* metrics = m_typeface->getAdvancedTypefaceMetrics(SkAdvancedTypefaceMetrics::kNo_PerGlyphInfo);
m_emSizeInFontUnits = metrics->fEmSize;
metrics->unref();
#endif
return m_emSizeInFontUnits;
}
SkAdvancedTypefaceMetrics* DWriteFontTypeface::onGetAdvancedTypefaceMetrics(
PerGlyphInfo perGlyphInfo,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
SkAdvancedTypefaceMetrics* info = nullptr;
HRESULT hr = S_OK;
const unsigned glyphCount = fDWriteFontFace->GetGlyphCount();
DWRITE_FONT_METRICS dwfm;
fDWriteFontFace->GetMetrics(&dwfm);
info = new SkAdvancedTypefaceMetrics;
info->fEmSize = dwfm.designUnitsPerEm;
info->fLastGlyphID = SkToU16(glyphCount - 1);
// SkAdvancedTypefaceMetrics::fFontName is in theory supposed to be
// the PostScript name of the font. However, due to the way it is currently
// used, it must actually be a family name.
SkTScopedComPtr<IDWriteLocalizedStrings> familyNames;
hr = fDWriteFontFamily->GetFamilyNames(&familyNames);
UINT32 familyNameLen;
hr = familyNames->GetStringLength(0, &familyNameLen);
SkSMallocWCHAR familyName(familyNameLen+1);
hr = familyNames->GetString(0, familyName.get(), familyNameLen+1);
hr = sk_wchar_to_skstring(familyName.get(), familyNameLen, &info->fFontName);
if (perGlyphInfo & kToUnicode_PerGlyphInfo) {
populate_glyph_to_unicode(fDWriteFontFace.get(), glyphCount, &(info->fGlyphToUnicode));
}
DWRITE_FONT_FACE_TYPE fontType = fDWriteFontFace->GetType();
if (fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE ||
fontType == DWRITE_FONT_FACE_TYPE_TRUETYPE_COLLECTION) {
info->fType = SkAdvancedTypefaceMetrics::kTrueType_Font;
} else {
info->fAscent = dwfm.ascent;
info->fDescent = dwfm.descent;
info->fCapHeight = dwfm.capHeight;
return info;
}
AutoTDWriteTable<SkOTTableHead> headTable(fDWriteFontFace.get());
AutoTDWriteTable<SkOTTablePostScript> postTable(fDWriteFontFace.get());
AutoTDWriteTable<SkOTTableHorizontalHeader> hheaTable(fDWriteFontFace.get());
AutoTDWriteTable<SkOTTableOS2> os2Table(fDWriteFontFace.get());
if (!headTable.fExists || !postTable.fExists || !hheaTable.fExists || !os2Table.fExists) {
info->fAscent = dwfm.ascent;
info->fDescent = dwfm.descent;
info->fCapHeight = dwfm.capHeight;
return info;
}
//There exist CJK fonts which set the IsFixedPitch and Monospace bits,
//but have full width, latin half-width, and half-width kana.
bool fixedWidth = (postTable->isFixedPitch &&
(1 == SkEndian_SwapBE16(hheaTable->numberOfHMetrics)));
//Monospace
if (fixedWidth) {
info->fStyle |= SkAdvancedTypefaceMetrics::kFixedPitch_Style;
}
//Italic
if (os2Table->version.v0.fsSelection.field.Italic) {
info->fStyle |= SkAdvancedTypefaceMetrics::kItalic_Style;
}
//Script
if (SkPanose::FamilyType::Script == os2Table->version.v0.panose.bFamilyType.value) {
info->fStyle |= SkAdvancedTypefaceMetrics::kScript_Style;
//Serif
} else if (SkPanose::FamilyType::TextAndDisplay == os2Table->version.v0.panose.bFamilyType.value &&
SkPanose::Data::TextAndDisplay::SerifStyle::Triangle <= os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value &&
SkPanose::Data::TextAndDisplay::SerifStyle::NoFit != os2Table->version.v0.panose.data.textAndDisplay.bSerifStyle.value) {
info->fStyle |= SkAdvancedTypefaceMetrics::kSerif_Style;
}
info->fItalicAngle = SkEndian_SwapBE32(postTable->italicAngle) >> 16;
info->fAscent = SkToS16(dwfm.ascent);
info->fDescent = SkToS16(dwfm.descent);
info->fCapHeight = SkToS16(dwfm.capHeight);
info->fBBox = SkIRect::MakeLTRB((int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMin),
(int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMax),
(int32_t)SkEndian_SwapBE16((uint16_t)headTable->xMax),
(int32_t)SkEndian_SwapBE16((uint16_t)headTable->yMin));
//TODO: is this even desired? It seems PDF only wants this value for Type1
//fonts, and we only get here for TrueType fonts.
info->fStemV = 0;
/*
// Figure out a good guess for StemV - Min width of i, I, !, 1.
// This probably isn't very good with an italic font.
int16_t min_width = SHRT_MAX;
info->fStemV = 0;
char stem_chars[] = {'i', 'I', '!', '1'};
for (size_t i = 0; i < SK_ARRAY_COUNT(stem_chars); i++) {
ABC abcWidths;
if (GetCharABCWidths(hdc, stem_chars[i], stem_chars[i], &abcWidths)) {
int16_t width = abcWidths.abcB;
if (width > 0 && width < min_width) {
min_width = width;
info->fStemV = min_width;
}
}
}
*/
if (perGlyphInfo & kHAdvance_PerGlyphInfo) {
if (fixedWidth) {
SkAdvancedTypefaceMetrics::WidthRange range(0);
int16_t advance;
getWidthAdvance(fDWriteFontFace.get(), 1, &advance);
range.fAdvance.append(1, &advance);
SkAdvancedTypefaceMetrics::FinishRange(
&range, 0, SkAdvancedTypefaceMetrics::WidthRange::kDefault);
info->fGlyphWidths.emplace_back(std::move(range));
} else {
IDWriteFontFace* borrowedFontFace = fDWriteFontFace.get();
info->setGlyphWidths(
glyphCount,
glyphIDs,
glyphIDsCount,
SkAdvancedTypefaceMetrics::GetAdvance([borrowedFontFace](int gId, int16_t* data) {
return getWidthAdvance(borrowedFontFace, gId, data);
})
);
}
}
return info;
}