std::string FontRendererImpl::GetFontKey(ComPtr<IDWriteFontFace> fontFace, float emSize)
{
// get the file reference key
uint32_t reqFiles = 1;
IDWriteFontFile* file;
fontFace->GetFiles(&reqFiles, &file);
const void* referenceKey;
uint32_t referenceKeySize;
file->GetReferenceKey(&referenceKey, &referenceKeySize);
// store in a buffer and append the size
uint32_t referenceKeySizeTarget = min(referenceKeySize, 128);
char refKeyBuffer[256];
memcpy(refKeyBuffer, referenceKey, referenceKeySizeTarget);
*(float*)&refKeyBuffer[referenceKeySizeTarget] = emSize;
// release the file
file->Release();
return std::string(refKeyBuffer, referenceKeySizeTarget + 4);
}
void QWinRTFontDatabase::releaseHandle(void *handle)
{
if (!handle)
return;
IDWriteFontFile *fontFile = reinterpret_cast<IDWriteFontFile *>(handle);
if (m_fonts.contains(fontFile)) {
m_fonts.remove(fontFile);
fontFile->Release();
return;
}
QBasicFontDatabase::releaseHandle(handle);
}