dwrite: Implement FindFamilyName() for system font collection.

dlls/dwrite/font.c

@@ -690,8 +690,22 @@ static HRESULT WINAPI dwritefontcollection_GetFontFamily(IDWriteFontCollection *
 static HRESULT WINAPI dwritefontcollection_FindFamilyName(IDWriteFontCollection *iface, const WCHAR *name, UINT32 *index, BOOL *exists)
 {
     struct dwrite_fontcollection *This = impl_from_IDWriteFontCollection(iface);
-    FIXME("(%p)->(%s %p %p): stub\n", This, debugstr_w(name), index, exists);
-    return E_NOTIMPL;
+    UINT32 i;
+
+    TRACE("(%p)->(%s %p %p)\n", This, debugstr_w(name), index, exists);
+
+    for (i = 0; i < This->count; i++)
+        if (!strcmpW(This->families[i], name))
+        {
+            *index = i;
+            *exists = TRUE;
+            return S_OK;
+        }
+
+    *index = (UINT32)-1;
+    *exists = FALSE;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI dwritefontcollection_GetFontFromFontFace(IDWriteFontCollection *iface, IDWriteFontFace *face, IDWriteFont **font)

dlls/dwrite/tests/font.c

@@ -536,7 +536,6 @@ static void test_system_fontcollection(void)
     i = IDWriteFontCollection_GetFontFamilyCount(collection);
     ok(i, "got %u\n", i);
 
-todo_wine {
     ret = FALSE;
     i = (UINT32)-1;
     hr = IDWriteFontCollection_FindFamilyName(collection, tahomaW, &i, &ret);
@@ -550,7 +549,7 @@ todo_wine {
     ok(hr == S_OK, "got 0x%08x\n", hr);
     ok(!ret, "got %d\n", ret);
     ok(i == (UINT32)-1, "got %u\n", i);
-}
+
     IDWriteFontCollection_Release(collection);
 }