Updated README. Added example config. Added default font for ease of use.

README.md

@@ -3,9 +3,10 @@ A utility which can be used to create custom images for TRMNL devices via code
 
 # How to write new visual stuff
 1. Inherit from `Widget` and then do your magic inside your own class.
-2. Instantiate your widget in `main.cpp` and add it to the vector of widgets.
-3. ???
-4. Profit
+2. Add your widget builder in `main.cpp` inside `init builders`.
+3. Write your config file.
+4. ???
+5. Profit
 
 # ImageMagick commands
 ### Convert image without dithering

config_example.json

@@ -0,0 +1,14 @@
+{
+	"width": 800,
+	"height": 600,
+	"output": "trmnl.png",
+	"font": "font.ttf",
+	"widgets":
+	[
+		{
+			"name": "widget_name",
+			"parameter1": "example",
+			"parameter2": 10
+		}
+	]
+}

main.cpp

@@ -63,6 +63,7 @@ int main(int argc, char **argv)
 	// Change screen size from JSON
 	json_extract(cfg, "width", screen_width);
 	json_extract(cfg, "height", screen_height);
+	json_extract(cfg, "font", default_font_name);
 
 	// Create surface
 	main_surface = SDL_CreateRGBSurfaceWithFormat(0, screen_width, screen_height, 32, SDL_PIXELFORMAT_RGBA8888);

sdl_helpers.cpp

@@ -53,7 +53,7 @@ void clean_sdl()
 	SDL_Quit();
 }
 
-TTF_Font* get_font(const string& filename, int size)
+TTF_Font* get_font(int size, const string& filename)
 {
 	pair<string, int> key(filename, size);
 	if (0 != font_map.count(key))

sdl_helpers.h

@@ -8,6 +8,8 @@
 
 #include "json.hpp"
 
+std::string default_font_name = "font.ttf";
+
 // Call this before everything
 // Prints its messages
 bool init_sdl();
@@ -17,7 +19,7 @@ void clean_sdl();
 
 // A simple way to get a font pointer to use
 // Can return NULL
-TTF_Font* get_font(const std::string& filename, int size);
+TTF_Font* get_font(int size, const std::string& filename = default_font_name);
 
 // Reads the file and tries to parse a JSON file with comments
 // cfg - output json struct