bool
ScaledFontWin::GetFontFileData(FontFileDataOutput aDataCallback, void *aBaton)
{
AutoDC dc;
AutoSelectFont font(dc.GetDC(), &mLogFont);
// Check for a font collection first.
uint32_t table = 0x66637474; // 'ttcf'
uint32_t tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
if (tableSize == GDI_ERROR) {
// Try as if just a single font.
table = 0;
tableSize = ::GetFontData(dc.GetDC(), table, 0, nullptr, 0);
if (tableSize == GDI_ERROR) {
return false;
}
}
UniquePtr<uint8_t[]> fontData(new uint8_t[tableSize]);
uint32_t sizeGot =
::GetFontData(dc.GetDC(), table, 0, fontData.get(), tableSize);
if (sizeGot != tableSize) {
return false;
}
// If it's a font collection then attempt to get the index.
uint32_t index = 0;
if (table != 0) {
UniquePtr<SFNTData> sfntData = SFNTData::Create(fontData.get(),
tableSize);
if (!sfntData) {
gfxWarning() << "Failed to create SFNTData for GetFontFileData.";
return false;
}
// We cast here because for VS2015 char16_t != wchar_t, even though they are
// both 16 bit.
if (!sfntData->GetIndexForU16Name(
reinterpret_cast<char16_t*>(mLogFont.lfFaceName), &index, LF_FACESIZE - 1)) {
gfxWarning() << "Failed to get index for face name.";
gfxDevCrash(LogReason::GetFontFileDataFailed) <<
"Failed to get index for face name |" <<
NS_ConvertUTF16toUTF8(mLogFont.lfFaceName).get() << "|.";
return false;
}
}
aDataCallback(fontData.get(), tableSize, index, mSize, aBaton);
return true;
}
