add gui.font_scale setting

README.md

@@ -75,7 +75,6 @@ the result of fundamental issues with Discord's thread implementation.
 5. `make`
 6. [Copy resources](#resources)
 
-
 #### Linux:
 
 1. Install dependencies
@@ -300,6 +299,7 @@ For example, memory_db would be set by adding `memory_db = true` under the line
 | `save_state`                | boolean | true    | save the state of the gui (active channels, tabs, expanded channels)                                                       |
 | `alt_menu`                  | boolean | false   | keep the menu hidden unless revealed with alt key                                                                          |
 | `hide_to_tray`              | boolean | false   | hide abaddon to the system tray on window close                                                                            |
+| `font_scale`                | double  |         | scale font rendering. 1 is unchanged                                                                                       |
 
 #### style
 

src/abaddon.cpp

@@ -263,6 +263,13 @@ int Abaddon::StartGTK() {
     }
 #endif
 
+    if (m_settings.GetSettings().FontScale > 0.0) {
+        auto dpi = Gdk::Screen::get_default()->get_resolution();
+        if (dpi < 0.0) dpi = 96.0;
+        auto newdpi = dpi * 1024.0 * m_settings.GetSettings().FontScale;
+        Gtk::Settings::get_default()->set_property("gtk-xft-dpi", newdpi);
+    }
+
     // store must be checked before this can be called
     m_main_window->UpdateComponents();
 

src/settings.cpp

@@ -42,6 +42,10 @@ void SettingsManager::ReadSettings() {
     try {                                                  \
         m_settings.var = m_file.get_integer(section, key); \
     } catch (...) {}
+#define SMFLT(section, key, var)                          \
+    try {                                                 \
+        m_settings.var = m_file.get_double(section, key); \
+    } catch (...) {}
 
     SMSTR("discord", "api_base", APIBaseURL);
     SMSTR("discord", "gateway", GatewayURL);
@@ -59,6 +63,7 @@ void SettingsManager::ReadSettings() {
     SMBOOL("gui", "unreads", Unreads);
     SMBOOL("gui", "alt_menu", AltMenu);
     SMBOOL("gui", "hide_to_tray", HideToTray);
+    SMFLT("gui", "font_scale", FontScale);
     SMINT("http", "concurrent", CacheHTTPConcurrency);
     SMSTR("http", "user_agent", UserAgent);
     SMSTR("style", "expandercolor", ChannelsExpanderColor);
@@ -102,6 +107,7 @@ void SettingsManager::ReadSettings() {
 #undef SMBOOL
 #undef SMSTR
 #undef SMINT
+#undef SMFLT
 
     m_read_settings = m_settings;
 }
@@ -127,6 +133,9 @@ void SettingsManager::Close() {
 #define SMINT(section, key, var)               \
     if (m_settings.var != m_read_settings.var) \
         m_file.set_integer(section, key, m_settings.var);
+#define SMFLT(section, key, var)               \
+    if (m_settings.var != m_read_settings.var) \
+        m_file.set_double(section, key, m_settings.var);
 
         SMSTR("discord", "api_base", APIBaseURL);
         SMSTR("discord", "gateway", GatewayURL);
@@ -144,6 +153,7 @@ void SettingsManager::Close() {
         SMBOOL("gui", "unreads", Unreads);
         SMBOOL("gui", "alt_menu", AltMenu);
         SMBOOL("gui", "hide_to_tray", HideToTray);
+        SMFLT("gui", "font_scale", FontScale);
         SMINT("http", "concurrent", CacheHTTPConcurrency);
         SMSTR("http", "user_agent", UserAgent);
         SMSTR("style", "expandercolor", ChannelsExpanderColor);
@@ -172,6 +182,7 @@ void SettingsManager::Close() {
 #undef SMSTR
 #undef SMBOOL
 #undef SMINT
+#undef SMFLT
 
         try {
             if (!m_file.save_to_file(m_filename))

src/settings.hpp

@@ -30,6 +30,7 @@ public:
         bool Unreads { true };
         bool AltMenu { false };
         bool HideToTray { false };
+        double FontScale { -1.0 };
 
         // [http]
         int CacheHTTPConcurrency { 20 };