Fix font enumeration, with the same family name, on Windows.

Function EnumFontFamiliesEx with parameters (lfCharSet = DEFAULT_CHARSET, lfFaceName = '\0') enumerates only first installed font from many with same family name.
This patch calls EnumFontFamiliesEx twice:
 1. Without family name to enumerate families;
 2. With family name to enumerate fonts with same family.

Task-number: QTBUG-40828
Change-Id: Ic36a24a9e70f735a7324c05fe4b70f7c7e5710d0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>

1 files changed, 34 insertions, 2 deletions

diff --git a/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp b/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
index 99c9e0faba..011fc9facb 100644
--- a/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase_ft.cpp
@@ -375,6 +375,31 @@ static int QT_WIN_CALLBACK storeFont(ENUMLOGFONTEX* f, NEWTEXTMETRICEX *textmetr
     return 1;
 }
 
+static int QT_WIN_CALLBACK storeFontSub(ENUMLOGFONTEX* f, NEWTEXTMETRICEX *textmetric,
+                                        int type, LPARAM namesSetIn)
+{
+    Q_UNUSED(textmetric)
+    Q_UNUSED(type)
+
+    HDC dummy = GetDC(0);
+    LOGFONT lf;
+    lf.lfCharSet = DEFAULT_CHARSET;
+    if (wcslen(f->elfLogFont.lfFaceName) >= LF_FACESIZE) {
+        qWarning("%s: Unable to enumerate family '%s'.",
+                 __FUNCTION__, qPrintable(QString::fromWCharArray(f->elfLogFont.lfFaceName)));
+        return 1;
+    }
+    wmemcpy(lf.lfFaceName, f->elfLogFont.lfFaceName,
+            wcslen(f->elfLogFont.lfFaceName) + 1);
+    lf.lfPitchAndFamily = 0;
+    EnumFontFamiliesEx(dummy, &lf, (FONTENUMPROC)storeFont,
+                       (LPARAM)namesSetIn, 0);
+    ReleaseDC(0, dummy);
+
+    // keep on enumerating
+    return 1;
+}
+
 void QWindowsFontDatabaseFT::populateFontDatabase()
 {
     m_families.clear();
@@ -409,8 +434,15 @@ void QWindowsFontDatabaseFT::populate(const QString &family)
     wmemcpy(lf.lfFaceName, reinterpret_cast<const wchar_t*>(family.utf16()),
             family.size() + 1);
     lf.lfPitchAndFamily = 0;
-    EnumFontFamiliesEx(dummy, &lf, (FONTENUMPROC)storeFont,
-                       (LPARAM)&m_families, 0);
+
+    if (family.isEmpty()) {
+        EnumFontFamiliesEx(dummy, &lf, (FONTENUMPROC)storeFontSub,
+                           (LPARAM)&m_families, 0);
+    } else {
+        EnumFontFamiliesEx(dummy, &lf, (FONTENUMPROC)storeFont,
+                           (LPARAM)&m_families, 0);
+    }
+
     ReleaseDC(0, dummy);
 }