gtk-egl: add scanout_disable support

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1487669841-13668-7-git-send-email-kraxel@redhat.com

include/ui/gtk.h

@@ -103,6 +103,7 @@ void gd_egl_switch(DisplayChangeListener *dcl,
                    DisplaySurface *surface);
 QEMUGLContext gd_egl_create_context(DisplayChangeListener *dcl,
                                     QEMUGLParams *params);
+void gd_egl_scanout_disable(DisplayChangeListener *dcl);
 void gd_egl_scanout_texture(DisplayChangeListener *dcl,
                             uint32_t backing_id,
                             bool backing_y_0_top,

ui/gtk-egl.c

@@ -170,6 +170,16 @@ QEMUGLContext gd_egl_create_context(DisplayChangeListener *dcl,
     return qemu_egl_create_context(dcl, params);
 }
 
+void gd_egl_scanout_disable(DisplayChangeListener *dcl)
+{
+    VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
+
+    vc->gfx.w = 0;
+    vc->gfx.h = 0;
+    vc->gfx.tex_id = 0;
+    gtk_egl_set_scanout_mode(vc, false);
+}
+
 void gd_egl_scanout_texture(DisplayChangeListener *dcl,
                             uint32_t backing_id, bool backing_y_0_top,
                             uint32_t backing_width, uint32_t backing_height,
@@ -188,11 +198,6 @@ void gd_egl_scanout_texture(DisplayChangeListener *dcl,
     eglMakeCurrent(qemu_egl_display, vc->gfx.esurface,
                    vc->gfx.esurface, vc->gfx.ectx);
 
-    if (vc->gfx.tex_id == 0 || vc->gfx.w == 0 || vc->gfx.h == 0) {
-        gtk_egl_set_scanout_mode(vc, false);
-        return;
-    }
-
     gtk_egl_set_scanout_mode(vc, true);
     if (!vc->gfx.fbo_id) {
         glGenFramebuffers(1, &vc->gfx.fbo_id);

ui/gtk.c

@@ -688,6 +688,7 @@ static const DisplayChangeListenerOps dcl_egl_ops = {
     .dpy_gl_ctx_destroy      = qemu_egl_destroy_context,
     .dpy_gl_ctx_make_current = gd_egl_make_current,
     .dpy_gl_ctx_get_current  = qemu_egl_get_current_context,
+    .dpy_gl_scanout_disable  = gd_egl_scanout_disable,
     .dpy_gl_scanout_texture  = gd_egl_scanout_texture,
     .dpy_gl_update           = gd_egl_scanout_flush,
 };