91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
// 14 april 2016
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#include "uipriv_windows.hpp"
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#include "attrstr.hpp"
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IDWriteFactory *dwfactory = NULL;
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// TOOD rename to something else, maybe
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HRESULT uiprivInitDrawText(void)
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{
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// TOOD use DWRITE_FACTORY_TYPE_ISOLATED instead?
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return DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED,
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__uuidof (IDWriteFactory),
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(IUnknown **) (&dwfactory));
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}
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void uiprivUninitDrawText(void)
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{
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dwfactory->Release();
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}
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fontCollection *uiprivLoadFontCollection(void)
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{
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fontCollection *fc;
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HRESULT hr;
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fc = uiprivNew(fontCollection);
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// always get the latest available font information
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hr = dwfactory->GetSystemFontCollection(&(fc->fonts), TRUE);
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if (hr != S_OK)
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logHRESULT(L"error getting system font collection", hr);
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fc->userLocaleSuccess = GetUserDefaultLocaleName(fc->userLocale, LOCALE_NAME_MAX_LENGTH);
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return fc;
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}
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void uiprivFontCollectionFree(fontCollection *fc)
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{
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fc->fonts->Release();
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uiprivFree(fc);
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}
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WCHAR *uiprivFontCollectionFamilyName(fontCollection *fc, IDWriteFontFamily *family)
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{
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IDWriteLocalizedStrings *names;
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WCHAR *str;
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HRESULT hr;
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hr = family->GetFamilyNames(&names);
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if (hr != S_OK)
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logHRESULT(L"error getting names of font out", hr);
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str = fontCollectionCorrectString(fc, names);
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names->Release();
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return str;
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}
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WCHAR *uiprivFontCollectionCorrectString(fontCollection *fc, IDWriteLocalizedStrings *names)
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{
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UINT32 index;
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BOOL exists;
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UINT32 length;
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WCHAR *wname;
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HRESULT hr;
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// this is complex, but we ignore failure conditions to allow fallbacks
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// 1) If the user locale name was successfully retrieved, try it
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// 2) If the user locale name was not successfully retrieved, or that locale's string does not exist, or an error occurred, try L"en-us", the US English locale
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// 3) And if that fails, assume the first one
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// This algorithm is straight from MSDN: https://msdn.microsoft.com/en-us/library/windows/desktop/dd368214%28v=vs.85%29.aspx
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// For step 2 to work, start by setting hr to S_OK and exists to FALSE.
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// TODO does it skip step 2 entirely if step 1 fails? rewrite it to be a more pure conversion of the MSDN code?
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hr = S_OK;
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exists = FALSE;
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if (fc->userLocaleSuccess != 0)
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hr = names->FindLocaleName(fc->userLocale, &index, &exists);
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if (hr != S_OK || (hr == S_OK && !exists))
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hr = names->FindLocaleName(L"en-us", &index, &exists);
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// TODO check hr again here? or did I decide that would be redundant because COM requires output arguments to be filled regardless of return value?
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if (!exists)
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index = 0;
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hr = names->GetStringLength(index, &length);
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if (hr != S_OK)
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logHRESULT(L"error getting length of font name", hr);
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// GetStringLength() does not include the null terminator, but GetString() does
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wname = (WCHAR *) uiAlloc((length + 1) * sizeof (WCHAR), "WCHAR[]");
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hr = names->GetString(index, wname, length + 1);
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if (hr != S_OK)
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logHRESULT(L"error getting font name", hr);
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return wname;
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}
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