https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1037256#20
Above Message #20 approach might be too ad-hoc, it might be better to investigate more generic alternative. just as PoC, it might be useful to apply custom style, but this is just an idea and not fully confirmed yet.
>From 22ba16ddf1f7246db8dd8da6deda53ef76f20a81 Mon Sep 17 00:00:00 2001 From: Kentaro Hayashi <ken...@xdump.org> Date: Mon, 23 Dec 2024 23:26:17 +0900 Subject: [PATCH 1/2] gtk: support to apply custom styles with gtkrc In the previous versions, it does not support applying language specific custom style. Without custom style, it can't resolve language specific style issue such as Han unification. Because of Han unification, wrong font typefaces are rendered by default when you choose Japanese language using GUI installer. Most of typefaces are correct, but there are wrong typefaces (Simplified Chinese) which is used for widget rendering. Notably, even though "Continue" or "Back" button can't be rendered correctly. This issue [1] will not be solved by using DroidSansFallback.ttf (which is shipped by fonts-android udeb) for Japanese. It means that we need to switch font itself which contains Japanese typeface to fix this issue. In this commit, add fallback to apply custom gtkrc to override existing style. [1] Your Code Displays Japanese Wrong https://heistak.github.io/your-code-displays-japanese-wrong/ Signed-off-by: Kentaro Hayashi <ken...@xdump.org> --- src/modules/frontend/gtk/di.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/src/modules/frontend/gtk/di.c b/src/modules/frontend/gtk/di.c index a6cb38f1..843624d4 100644 --- a/src/modules/frontend/gtk/di.c +++ b/src/modules/frontend/gtk/di.c @@ -45,6 +45,7 @@ #include <gtk/gtk.h> #include <gdk/gdkkeysyms.h> +#include <glib/gprintf.h> #include "question.h" #include "database.h" @@ -355,6 +356,36 @@ static GtkTextDirection get_text_direction(struct frontend * fe) return direction; } +/** Set language specific style explicitly + * + * @param fe cdebconf frontend + */ +static void set_language_specific_style(struct frontend *fe) +{ + gchar rc_language_path[PATH_MAX]; + gchar * rc_contents; + gsize length; + char * language = cdebconf_gtk_get_text(fe, "debconf/language", + "Current language for installer"); + if (language) { + /* Apply language specific custom style, such as + * font name. + * + * Typically, it is required to resolve Han Unification issue + * for rendering Japanese typeface correctly. + * + * [1] https://wiki.debian.org/DebianInstaller/GUIFonts + */ + g_snprintf(rc_language_path, PATH_MAX, "/etc/gtk-2.0/%s.gtkrc", language); + if (g_file_test(rc_language_path, G_FILE_TEST_IS_REGULAR)) { + if (g_file_get_contents(rc_language_path, &rc_contents, &length, NULL)) { + gtk_rc_parse_string(rc_contents); + g_free(rc_contents); + } + } + } +} + /** Update various settings with the current language settings. * * @param fe cdebconf frontend @@ -365,6 +396,9 @@ static void refresh_language(struct frontend * fe) gtk_rc_reparse_all(); /* Adapt text direction. */ gtk_widget_set_default_direction(get_text_direction(fe)); + + /* Override specific style supplementary */ + set_language_specific_style(fe); } /** Update what needs to be updated on a new user interaction. -- 2.45.2
