Feature: Automatic UI and font zoom levels when supported by the OS.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/gfx.cpp b/src/gfx.cpp
index 54851d375..786bbb25b 100644
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -59,6 +59,10 @@ static ReusableBuffer<uint8> _cursor_backup;
 ZoomLevel _gui_zoom; ///< GUI Zoom level
 ZoomLevel _font_zoom; ///< Font Zoom level
 
+int8 _gui_zoom_cfg;  ///< GUI zoom level in config.
+int8 _font_zoom_cfg; ///< Font zoom level in config.
+
+
 /**
  * The rect for repaint.
  *
@@ -1876,3 +1880,23 @@ void SortResolutions()
 {
 	std::sort(_resolutions.begin(), _resolutions.end());
 }
+
+/**
+ * Resolve GUI zoom level, if auto-suggestion is requested.
+ */
+void UpdateGUIZoom()
+{
+	/* Determine real GUI zoom to use. */
+	if (_gui_zoom_cfg == ZOOM_LVL_CFG_AUTO) {
+		_gui_zoom = static_cast<ZoomLevel>(Clamp(VideoDriver::GetInstance()->GetSuggestedUIZoom(), _settings_client.gui.zoom_min, _settings_client.gui.zoom_max));
+	} else {
+		_gui_zoom = static_cast<ZoomLevel>(_gui_zoom_cfg);
+	}
+
+	/* Determine real font zoom to use. */
+	if (_font_zoom_cfg == ZOOM_LVL_CFG_AUTO) {
+		_font_zoom = static_cast<ZoomLevel>(VideoDriver::GetInstance()->GetSuggestedUIZoom());
+	} else {
+		_font_zoom = static_cast<ZoomLevel>(_font_zoom_cfg);
+	}
+}