From: Christoffer Aasted <dezzadk@gmail.com>
Date: Sun, 14 Jun 2026 15:46:12 +0000 (+0000)
Subject: patch 9.2.0646: GTK3 GUI slow on HiDPI/4K with software rendering
X-Git-Tag: v9.2.0646^0
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0f58fc39e206d45e9c82a8936a2c28fa6422ce47;p=thirdparty%2Fvim.git

patch 9.2.0646: GTK3 GUI slow on HiDPI/4K with software rendering

Problem:  GTK3 GUI slow on HiDPI/4K with software rendering
Solution: Turn off Alpha rendering processing (Christoffer Aasted)

Reduces the processing load significantly, since it contains no alpha
channel.

https://www.cairographics.org/manual/cairo-cairo-surface-t.html#CAIRO-CONTENT-COLOR-ALPHA:CAPS

Tested on aarch64 with a rpi5 and 4k/hidpi integer scaling.

Slowest gvim I have encountered yet.

Slow symptoms;
* Startup
* Scrolling
* Drawing text
* Loading new buffers

related: #18002
closes:  #20513

Signed-off-by: Christoffer Aasted <dezzadk@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
---

diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index b99f49062f..5fe1ea730b 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -814,7 +814,7 @@ scale_factor_event(GtkWidget *widget,
     gtk_window_get_size(GTK_WINDOW(gui.mainwin), &w, &h);
     gui.surface = gdk_window_create_similar_surface(
 	    gtk_widget_get_window(widget),
-	    CAIRO_CONTENT_COLOR_ALPHA,
+	    CAIRO_CONTENT_COLOR,
 	    w, h);
 
     int	    usable_height = h;
@@ -2900,7 +2900,7 @@ drawarea_realize_cb(GtkWidget *widget, gpointer data UNUSED)
 #if GTK_CHECK_VERSION(3,0,0)
     gui.surface = gdk_window_create_similar_surface(
 	    gtk_widget_get_window(widget),
-	    CAIRO_CONTENT_COLOR_ALPHA,
+	    CAIRO_CONTENT_COLOR,
 	    gtk_widget_get_allocated_width(widget),
 	    gtk_widget_get_allocated_height(widget));
 #else
@@ -3035,7 +3035,7 @@ drawarea_configure_event_cb(GtkWidget	      *widget,
 
     gui.surface = gdk_window_create_similar_surface(
 	    gtk_widget_get_window(widget),
-	    CAIRO_CONTENT_COLOR_ALPHA,
+	    CAIRO_CONTENT_COLOR,
 	    event->width, event->height);
 
     gtk_widget_queue_draw(widget);
diff --git a/src/version.c b/src/version.c
index 4a8bfe8213..959bc0f9af 100644
--- a/src/version.c
+++ b/src/version.c
@@ -759,6 +759,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    646,
 /**/
     645,
 /**/