Make it possible to use the -visual argument

for xcb applications to use a specific visual id when creating windows.

Also make it possible to retrieve the visual id of a specific window
with QXcbWindowFunctions::visualId(QWindow *window).

UINT_MAX is used as an invalid visualId.

Change-Id: If62ada119ce8f9174cc211f53bbf1ce1bb7d021a
Reviewed-by: Andy Shaw <andy.shaw@digia.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/platformheaders/xcbfunctions/qxcbwindowfunctions.h b/src/platformheaders/xcbfunctions/qxcbwindowfunctions.h
index f9008039a1..ae05cf52a9 100644
--- a/src/platformheaders/xcbfunctions/qxcbwindowfunctions.h
+++ b/src/platformheaders/xcbfunctions/qxcbwindowfunctions.h
@@ -72,6 +72,17 @@ public:
         if (func)
             func(window, type);
     }
+
+    typedef uint (*VisualId)(QWindow *window);
+    static const QByteArray visualIdIdentifier() { return QByteArrayLiteral("XcbVisualId"); }
+
+    static uint visualId(QWindow *window)
+    {
+        QXcbWindowFunctions::VisualId func = reinterpret_cast<VisualId>(QGuiApplication::platformFunction(visualIdIdentifier()));
+        if (func)
+            return func(window);
+        return UINT_MAX;
+    }
 };