It is now possible to set a default custom theme, whether you want a hidpi default theme, or just use a custom font for the default theme

scene/register_scene_types.cpp

@@ -271,7 +271,28 @@ void register_scene_types() {
 	resource_loader_shader = memnew( ResourceFormatLoaderShader );
 	ResourceLoader::add_resource_format_loader( resource_loader_shader );
 
-	make_default_theme();
+	bool default_theme_hidpi=GLOBAL_DEF("display/use_hidpi_theme",false);
+	Globals::get_singleton()->set_custom_property_info("display/use_hidpi_theme",PropertyInfo(Variant::BOOL,"display/use_hidpi_theme",PROPERTY_HINT_NONE,"",PROPERTY_USAGE_DEFAULT|PROPERTY_USAGE_RESTART_IF_CHANGED));
+	String theme_path = GLOBAL_DEF("display/custom_theme","");
+	Globals::get_singleton()->set_custom_property_info("display/custom_theme",PropertyInfo(Variant::STRING,"display/custom_theme",PROPERTY_HINT_FILE,"*.tres,*.res",PROPERTY_USAGE_DEFAULT|PROPERTY_USAGE_RESTART_IF_CHANGED));
+	String font_path = GLOBAL_DEF("display/custom_theme_font","");
+	Globals::get_singleton()->set_custom_property_info("display/custom_theme_font",PropertyInfo(Variant::STRING,"display/custom_theme_font",PROPERTY_HINT_FILE,"*.tres,*.res,*.fnt",PROPERTY_USAGE_DEFAULT|PROPERTY_USAGE_RESTART_IF_CHANGED));
+
+
+	if (theme_path!=String()) {
+		Ref<Theme> theme = ResourceLoader::load(theme_path);
+		if (theme.is_valid()) {
+			Theme::set_default(theme);
+		}
+	} else {
+
+		Ref<Font> font;
+		if (font_path!=String()) {
+			font=ResourceLoader::load(font_path);
+		}
+		make_default_theme(default_theme_hidpi,font);
+	}
+
 
 	OS::get_singleton()->yield(); //may take time to init
 

scene/resources/default_theme/default_theme.cpp

@@ -16,14 +16,8 @@
 #include "theme_data.h"
 #include "os/os.h"
 
-
-#include "normal_font.inc"
-#include "bold_font.inc"
-#include "mono_font.inc"
-
-#include "font_normal.inc"
-#include "font_source.inc"
-#include "font_large.inc"
+#include "font_lodpi.inc"
+#include "font_hidpi.inc"
 
 typedef Map<const void*,Ref<ImageTexture> > TexCacheMap;
 
@@ -124,21 +118,14 @@ static Ref<BitmapFont> make_font(int p_height,int p_ascent, int p_valign, int p_
 	return font;
 }
 
+
+
 static Ref<BitmapFont> make_font2(int p_height,int p_ascent, int p_charcount, const int *p_char_rects,int p_kerning_count,const int *p_kernings,int p_w, int p_h, const unsigned char *p_img) {
 
 
 	Ref<BitmapFont> font( memnew( BitmapFont ) );
 
-	DVector<uint8_t> img;
-	img.resize(p_w*p_h*2);
-	{
-		DVector<uint8_t>::Write w = img.write();
-		for(int i=0;i<(p_w*p_h*2);i++) {
-			w[i]=p_img[i];
-		}
-	}
-
-	Image image(p_w,p_h,0,Image::FORMAT_GRAYSCALE_ALPHA,img);
+	Image image(p_img);
 	Ref<ImageTexture> tex = memnew( ImageTexture );
 	tex->create_from_image(image);
 
@@ -926,16 +913,23 @@ void fill_default_theme(Ref<Theme>& t,const Ref<Font> & default_font,const Ref<F
 
 }
 
-void make_default_theme() {
+void make_default_theme(bool p_hidpi,Ref<Font> p_font) {
 
 	Ref<Theme> t;
 	t.instance();
 
 	Ref<StyleBox> default_style;
 	Ref<Texture> default_icon;
-	Ref<BitmapFont> default_font=make_font2(_builtin_normal_font_height,_builtin_normal_font_ascent,_builtin_normal_font_charcount,&_builtin_normal_font_charrects[0][0],_builtin_normal_font_kerning_pair_count,&_builtin_normal_font_kerning_pairs[0][0],_builtin_normal_font_img_width,_builtin_normal_font_img_height,_builtin_normal_font_img_data);
-	Ref<BitmapFont> large_font=make_font2(_builtin_large_font_height,_builtin_large_font_ascent,_builtin_large_font_charcount,&_builtin_large_font_charrects[0][0],_builtin_large_font_kerning_pair_count,&_builtin_large_font_kerning_pairs[0][0],_builtin_large_font_img_width,_builtin_large_font_img_height,_builtin_large_font_img_data);
-	fill_default_theme(t,default_font,large_font,default_icon,default_style,false);
+	Ref<BitmapFont> default_font;
+	if (p_font.is_valid()) {
+		default_font=p_font;
+	} if (p_hidpi) {
+		default_font=make_font2(_hidpi_font_height,_hidpi_font_ascent,_hidpi_font_charcount,&_hidpi_font_charrects[0][0],_hidpi_font_kerning_pair_count,&_hidpi_font_kerning_pairs[0][0],_hidpi_font_img_width,_hidpi_font_img_height,_hidpi_font_img_data);
+	} else {
+		default_font=make_font2(_lodpi_font_height,_lodpi_font_ascent,_lodpi_font_charcount,&_lodpi_font_charrects[0][0],_lodpi_font_kerning_pair_count,&_lodpi_font_kerning_pairs[0][0],_lodpi_font_img_width,_lodpi_font_img_height,_lodpi_font_img_data);
+	}
+	Ref<BitmapFont> large_font=default_font;
+	fill_default_theme(t,default_font,large_font,default_icon,default_style,p_hidpi);
 
 	Theme::set_default( t );
 	Theme::set_default_icon( default_icon );

scene/resources/default_theme/default_theme.h

@@ -18,7 +18,7 @@
 */
 
 void fill_default_theme(Ref<Theme>& theme,const Ref<Font> & default_font,const Ref<Font> & large_font,Ref<Texture>& default_icon, Ref<StyleBox>& default_style,bool p_hidpi);
-void make_default_theme();
+void make_default_theme(bool p_hidpi, Ref<Font> p_font);
 void clear_default_theme();
 
 #endif

tools/editor/io_plugins/editor_font_import_plugin.cpp

@@ -489,18 +489,22 @@ class EditorFontImportDialog : public ConfirmationDialog {
 		Image img  = tex->get_data();
 
 		f->store_line("static const int _builtin_font_img_width="+itos(img.get_width())+";");
-		f->store_line("static const int _builtin_font_img_height="+itos(img.get_height())+";");
-		f->store_line("static const unsigned char _builtin_font_img_data["+itos(img.get_width()*img.get_height()*2)+"]={");
-		for(int i=0;i<img.get_height();i++) {
+		f->store_line("static const int _builtin_font_img_height="+itos(img.get_height())+";");		
 
-			for(int j=0;j<img.get_width();j++) {
+		String fname = p_font.basename()+".sv.png";
+		ResourceSaver::save(fname,tex);
+		Vector<uint8_t> data=FileAccess::get_file_as_array(fname);
 
-				Color c = img.get_pixel(j,i);
-				int v = CLAMP(((c.r+c.g+c.b)/3.0)*255,0,255);
-				int a = CLAMP(c.a*255,0,255);
 
-				f->store_line(itos(v)+","+itos(a)+",");
-			}
+		f->store_line("static const int _builtin_font_img_data_size="+itos(data.size())+";");
+		f->store_line("static const unsigned char _builtin_font_img_data["+itos(data.size())+"]={");
+
+
+
+		for(int i=0;i<data.size();i++) {
+
+			f->store_line(itos(data[i])+",");
+
 		}
 		f->store_line("};");