From 9d3eafa1a242fa6f9c9921092ad9c4ed01c2167f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Fri, 17 Jun 2016 11:38:13 -0400
Subject: [PATCH] wayland: Only set the opaque region if we got a opaque buffer

If the application set the window ALPHA_BITS hint to > 0, we will
choose an RGBA buffer instead of an RGBX buffer, meaning it will not be
opaque, and if so, lets not lie to the compositor saying it's opaque.
---
 src/wl_window.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/wl_window.c b/src/wl_window.c
index 04cbd997f..0deea6353 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -178,6 +178,12 @@ static const struct wl_surface_listener surfaceListener = {
 static void setOpaqueRegion(_GLFWwindow* window)
 {
     struct wl_region* region;
+    int alphaBits;
+
+    eglGetConfigAttrib(_glfw.egl.display, window->context.egl.config,
+                       EGL_ALPHA_SIZE, &alphaBits);
+    if (alphaBits > 0)
+        return;
 
     region = wl_compositor_create_region(_glfw.wl.compositor);
     if (!region)