From: Matthias Clasen <mclasen@redhat.com>
Date: Thu, 28 Jan 2021 23:17:22 +0000 (-0500)
Subject: widget: Use subpixel positioning
X-Git-Tag: archive/raspbian/4.4.1+ds1-2+rpi1~1^2~83^2^2~468^2~1
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=da59c77ae271f564762abf18daa551dfdc31fee1;p=gtk4.git

widget: Use subpixel positioning

Before turning off pangos rounding of glyph positions,
we must check if the cairo we are using is new enough
to have working subpixel positioning (the relevant
cairo commit is 52a7c79fd4ff96bb5fac175f0199819b0f8c18fc).
---

diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 3168091367..cddb261e47 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -6305,9 +6305,11 @@ update_pango_context (GtkWidget    *widget,
 
   font_desc = gtk_css_style_get_pango_font (style);
   pango_context_set_font_description (context, font_desc);
-
   pango_font_description_free (font_desc);
 
+  if (cairo_version () >= CAIRO_VERSION_ENCODE (1, 17, 4))
+    pango_context_set_round_glyph_positions (context, FALSE);
+
   pango_context_set_base_dir (context,
                               _gtk_widget_get_direction (widget) == GTK_TEXT_DIR_LTR ?
                               PANGO_DIRECTION_LTR : PANGO_DIRECTION_RTL);