From 73557d011bf165830ebd5e18643d09536c742392 Mon Sep 17 00:00:00 2001
From: Idriss Fekir <mcsm224@gmail.com>
Date: Tue, 21 May 2024 18:59:09 +0100
Subject: [PATCH] text: keep fonts usable if the current one becomes missing

If a font is being used and becomes missing all other fonts become
unusable, setting the fontconfig object to the pango fontmap
fixes this.
---
 app/text/gimptext-compat.c | 7 +++++++
 app/text/gimptextlayout.c  | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/app/text/gimptext-compat.c b/app/text/gimptext-compat.c
index fbf5901902..dfb11164c8 100644
--- a/app/text/gimptext-compat.c
+++ b/app/text/gimptext-compat.c
@@ -23,6 +23,8 @@
 #include <gegl.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <pango/pangocairo.h>
+#include <pango/pangofc-fontmap.h>
+#include <fontconfig/fontconfig.h>
 
 #include "libgimpcolor/gimpcolor.h"
 
@@ -154,6 +156,11 @@ text_get_extents (Gimp        *gimp,
     g_error ("You are using a Pango that has been built against a cairo "
              "that lacks the Freetype font backend");
 
+  /* In case a font becomes missing mid-session and is chosen (or is already in use)
+   * pango substitutes EVERY font for the default font, to avoid this
+   * the FcConfig has to be set everytime a pango fontmap is created
+   */
+  pango_fc_font_map_set_config (PANGO_FC_FONT_MAP (fontmap), FcConfigGetCurrent ());
   pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap),
                                        72.0); /* FIXME: resolution */
   context = pango_font_map_create_context (fontmap);
diff --git a/app/text/gimptextlayout.c b/app/text/gimptextlayout.c
index 9b7c957654..d3b27832ab 100644
--- a/app/text/gimptextlayout.c
+++ b/app/text/gimptextlayout.c
@@ -25,6 +25,8 @@
 #include <gegl.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>
 #include <pango/pangocairo.h>
+#include <pango/pangofc-fontmap.h>
+#include <fontconfig/fontconfig.h>
 
 #include "libgimpbase/gimpbase.h"
 #include "libgimpcolor/gimpcolor.h"
@@ -856,6 +858,11 @@ gimp_text_get_pango_context (GimpText *text,
     g_error ("You are using a Pango that has been built against a cairo "
              "that lacks the Freetype font backend");
 
+  /* In case a font becomes missing mid-session and is chosen (or is already in use)
+   * pango substitutes EVERY font for the default font, to avoid this
+   * the FcConfig has to be set everytime a pango fontmap is created
+   */
+  pango_fc_font_map_set_config (PANGO_FC_FONT_MAP (fontmap), FcConfigGetCurrent ());
   pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap), yres);
 
   context = pango_font_map_create_context (fontmap);