From: Chun-wei Fan <fanchunwei@src.gnome.org>
Date: Tue, 9 May 2023 10:10:34 +0000 (+0800)
Subject: gdkglcontext-win32-wgl.c: Always request alpha bits
X-Git-Tag: archive/raspbian/4.12.3+ds-1+rpi1~1^2^2^2~59^2^2~291^2
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=0073ee29da7dc1bfc3cc477206791056924adcbb;p=gtk4.git

gdkglcontext-win32-wgl.c: Always request alpha bits

...when we are using wglChoosePixelFormatARHB().  This ensures that we
hvae a HDC with a pixel format that will really support alpha bits, as
we did for the traditional ChoosePixelFormat().

Thanks to Patrick Zacharias for testing and pointing things out.
---

diff --git a/gdk/win32/gdkglcontext-win32-wgl.c b/gdk/win32/gdkglcontext-win32-wgl.c
index 3721d7136e..fdc8e50e6e 100644
--- a/gdk/win32/gdkglcontext-win32-wgl.c
+++ b/gdk/win32/gdkglcontext-win32-wgl.c
@@ -171,6 +171,9 @@ get_wgl_pfd (HDC                    hdc,
       pixelAttribs[i++] = WGL_COLOR_BITS_ARB;
       pixelAttribs[i++] = colorbits;
 
+      pixelAttribs[i++] = WGL_ALPHA_BITS_ARB;
+      pixelAttribs[i++] = 8;
+
       /* end of "Update PIXEL_ATTRIBUTES above if any groups are added here!" */
 
       pixelAttribs[i++] = 0; /* end of pixelAttribs */