I have no clue about what this code does,
but gtk_widget_set_double_buffered() is deprecated since GTK 3.14
and we require 3.22 since more than 4 years, commit 7b23d121f9
("ui: increase min required GTK version to 3.22.0").

Assert gtk_use_gl_area is set and remove the dead code.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 ui/gtk.c | 46 +++++++++-------------------------------------
 1 file changed, 9 insertions(+), 37 deletions(-)

diff --git a/ui/gtk.c b/ui/gtk.c
index bf9d3dd679..d968cf3de1 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -809,17 +809,9 @@ static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)
 
 #if defined(CONFIG_OPENGL)
     if (vc->gfx.gls) {
-        if (gtk_use_gl_area) {
-            /* invoke render callback please */
-            return FALSE;
-        } else {
-#ifdef CONFIG_X11
-            gd_egl_draw(vc);
-            return TRUE;
-#else
-            abort();
-#endif
-        }
+        assert(gtk_use_gl_area);
+        /* invoke render callback please */
+        return FALSE;
     }
 #endif
 
@@ -2156,32 +2148,12 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
 
 #if defined(CONFIG_OPENGL)
     if (display_opengl) {
-        if (gtk_use_gl_area) {
-            vc->gfx.drawing_area = gtk_gl_area_new();
-            g_signal_connect(vc->gfx.drawing_area, "realize",
-                             G_CALLBACK(gl_area_realize), vc);
-            vc->gfx.dcl.ops = &dcl_gl_area_ops;
-            vc->gfx.dgc.ops = &gl_area_ctx_ops;
-        } else {
-#ifdef CONFIG_X11
-            vc->gfx.drawing_area = gtk_drawing_area_new();
-            /*
-             * gtk_widget_set_double_buffered() was deprecated in 3.14.
-             * It is required for opengl rendering on X11 though.  A
-             * proper replacement (native opengl support) is only
-             * available in 3.16+.  Silence the warning if possible.
-             */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-            gtk_widget_set_double_buffered(vc->gfx.drawing_area, FALSE);
-#pragma GCC diagnostic pop
-            vc->gfx.dcl.ops = &dcl_egl_ops;
-            vc->gfx.dgc.ops = &egl_ctx_ops;
-            vc->gfx.has_dmabuf = qemu_egl_has_dmabuf();
-#else
-            abort();
-#endif
-        }
+        assert(gtk_use_gl_area);
+        vc->gfx.drawing_area = gtk_gl_area_new();
+        g_signal_connect(vc->gfx.drawing_area, "realize",
+                         G_CALLBACK(gl_area_realize), vc);
+        vc->gfx.dcl.ops = &dcl_gl_area_ops;
+        vc->gfx.dgc.ops = &gl_area_ctx_ops;
     } else
 #endif
     {
-- 
2.45.2

On Thu, Nov 21, 2024 at 02:09:39PM +0100, Philippe Mathieu-Daudé wrote:
> I have no clue about what this code does,
> but gtk_widget_set_double_buffered() is deprecated since GTK 3.14
> and we require 3.22 since more than 4 years, commit 7b23d121f9
> ("ui: increase min required GTK version to 3.22.0").
> 
> Assert gtk_use_gl_area is set and remove the dead code.

This assertion is dubious.

gtk_use_gl_area is only set when running on Win32, or running
on Wayland. IOW, the assert will fire on X11, which is a
supported platform, and Broadway which is admitedly more of
a curiosity than a serious GTK backend.

> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>  ui/gtk.c | 46 +++++++++-------------------------------------
>  1 file changed, 9 insertions(+), 37 deletions(-)
> 
> diff --git a/ui/gtk.c b/ui/gtk.c
> index bf9d3dd679..d968cf3de1 100644
> --- a/ui/gtk.c
> +++ b/ui/gtk.c
> @@ -809,17 +809,9 @@ static gboolean gd_draw_event(GtkWidget *widget, cairo_t *cr, void *opaque)
>  
>  #if defined(CONFIG_OPENGL)
>      if (vc->gfx.gls) {
> -        if (gtk_use_gl_area) {
> -            /* invoke render callback please */
> -            return FALSE;
> -        } else {
> -#ifdef CONFIG_X11
> -            gd_egl_draw(vc);
> -            return TRUE;
> -#else
> -            abort();
> -#endif
> -        }
> +        assert(gtk_use_gl_area);
> +        /* invoke render callback please */
> +        return FALSE;
>      }
>  #endif
>  
> @@ -2156,32 +2148,12 @@ static GSList *gd_vc_gfx_init(GtkDisplayState *s, VirtualConsole *vc,
>  
>  #if defined(CONFIG_OPENGL)
>      if (display_opengl) {
> -        if (gtk_use_gl_area) {
> -            vc->gfx.drawing_area = gtk_gl_area_new();
> -            g_signal_connect(vc->gfx.drawing_area, "realize",
> -                             G_CALLBACK(gl_area_realize), vc);
> -            vc->gfx.dcl.ops = &dcl_gl_area_ops;
> -            vc->gfx.dgc.ops = &gl_area_ctx_ops;
> -        } else {
> -#ifdef CONFIG_X11
> -            vc->gfx.drawing_area = gtk_drawing_area_new();
> -            /*
> -             * gtk_widget_set_double_buffered() was deprecated in 3.14.
> -             * It is required for opengl rendering on X11 though.  A
> -             * proper replacement (native opengl support) is only
> -             * available in 3.16+.  Silence the warning if possible.
> -             */



> -#pragma GCC diagnostic push
> -#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
> -            gtk_widget_set_double_buffered(vc->gfx.drawing_area, FALSE);
> -#pragma GCC diagnostic pop
> -            vc->gfx.dcl.ops = &dcl_egl_ops;
> -            vc->gfx.dgc.ops = &egl_ctx_ops;
> -            vc->gfx.has_dmabuf = qemu_egl_has_dmabuf();
> -#else
> -            abort();
> -#endif
> -        }
> +        assert(gtk_use_gl_area);
> +        vc->gfx.drawing_area = gtk_gl_area_new();
> +        g_signal_connect(vc->gfx.drawing_area, "realize",
> +                         G_CALLBACK(gl_area_realize), vc);
> +        vc->gfx.dcl.ops = &dcl_gl_area_ops;
> +        vc->gfx.dgc.ops = &gl_area_ctx_ops;
>      } else
>  #endif
>      {
> -- 
> 2.45.2
> 

With regards,
Daniel
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