110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
// 22 december 2015
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// Before we begin, you may be wondering why this file is C++.
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// Simple: <dwrite.h> is C++ only! Thanks Microsoft!
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// And unlike UI Automation which accidentally just forgets the 'struct' and 'enum' tags in places, <dwrite.h> is a full C++ header file, with class definitions and the use of __uuidof. Oh well :/
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#include "uipriv_windows.h"
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// notes:
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// only available in windows 8 and newer:
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// - character spacing
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// - kerning control
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// - justficiation (how could I possibly be making this up?!)
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// - vertical text (SERIOUSLY?! WHAT THE ACTUAL FUCK, MICROSOFT?!?!?!? bonus: some parts of MSDN even say 8.1 only!)
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static IDWriteFactory *dwfactory = NULL;
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HRESULT initDrawText(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 uninitDrawText(void)
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{
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dwfactory->Release();
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}
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struct uiDrawFontFamilies {
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IDWriteFontCollection *fonts;
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WCHAR userLocale[LOCALE_NAME_MAX_LENGTH];
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int userLocaleSuccess;
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};
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uiDrawFontFamilies *uiDrawListFontFamilies(void)
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{
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uiDrawFontFamilies *ff;
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HRESULT hr;
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ff = uiNew(uiDrawFontFamilies);
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// always get the latest available font information
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hr = dwfactory->GetSystemFontCollection(&(ff->fonts), TRUE);
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if (hr != S_OK)
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logHRESULT("error getting list of system fonts in uiDrawListFontFamilies()", hr);
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ff->userLocaleSuccess = GetUserDefaultLocaleName(ff->userLocale, LOCALE_NAME_MAX_LENGTH);
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return ff;
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}
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uintmax_t uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
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{
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return ff->fonts->GetFontFamilyCount();
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}
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char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, uintmax_t n)
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{
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IDWriteFontFamily *family;
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IDWriteLocalizedStrings *names;
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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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char *name;
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HRESULT hr;
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hr = ff->fonts->GetFontFamily(n, &family);
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if (hr != S_OK)
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logHRESULT("error getting font out of collection in uiDrawFontFamiliesFamily()", hr);
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hr = family->GetFamilyNames(&names);
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if (hr != S_OK)
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logHRESULT("error getting names of font out in uiDrawFontFamiliesFamily()", 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 (ff->userLocaleSuccess != 0)
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hr = names->FindLocaleName(ff->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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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("error getting length of font name in uiDrawFontFamiliesFamily()", 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("error getting font name in uiDrawFontFamiliesFamily()", hr);
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name = toUTF8(wname);
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uiFree(wname);
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names->Release();
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family->Release();
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return name;
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}
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void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
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{
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ff->fonts->Release();
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uiFree(ff);
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}
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