Tile first config option (-tile-first)

README

@@ -64,6 +64,7 @@ These flags take integers as argument.
 -tile-height
 -level-width : used by -create
 -level-height : used by -create
+-tile-first
 -editor-width
 -editor-height
 -editor-target-fps

include/conf.h

@@ -6,6 +6,7 @@
 
 #define TILE_WIDTH  16
 #define TILE_HEIGHT 16
+#define TILE_FIRST  0
 
 #define EDITOR_BACKGROUND_COLOR                                        \
 	(Color) { 0, 0, 0, 255 }

include/options.h

@@ -13,6 +13,7 @@ struct Options {
 	/* optionnal arguments, default values in conf.h */
 	int tile_width;
 	int tile_height;
+	int tile_first;
 	int new_level_width;
 	int new_level_height;
 	int editor_width;

src/editing_area/draw.c

@@ -18,10 +18,9 @@ void level_draw(struct Level level, struct Options options,
 			/* if tile index is out of bound, skip */
 			if (tile_index >= level.width * level.height)
 				continue;
-			const Tile tile =
-			    level.data[x + y * level.width];
+			const Tile tile = level.data[tile_index] - options.tile_first;
 			/* if tile is not in tileset, skip */
-			if (!tile || tile >= options.tileset_width *
+			if (tile < 0 || (!tile && !options.tile_first) || tile >= options.tileset_width *
 			                         options.tileset_height)
 				continue;
 

src/main.c

@@ -99,6 +99,7 @@ static void process_arguments(int argc, char **argv,
 		    {"tileset", required_argument, 0, 't'},
 		    {"tile-width", required_argument, 0, 'w'},
 		    {"tile-height", required_argument, 0, 'h'},
+		    {"tile-first", required_argument, 0, 'I'},
 		    {"level-width", required_argument, 0, 'i'},
 		    {"level-height", required_argument, 0, 'e'},
 		    {"editor-width", required_argument, 0, 'W'},
@@ -136,6 +137,9 @@ static void process_arguments(int argc, char **argv,
 		case 'h': /* tile height */
 			options->tile_height = int_arg_min(opt, 1);
 			break;
+		case 'I': /* first tile index */
+			options->tile_first = int_arg_min(opt, 0);
+			break;
 		case 'i': /* new level width */
 			options->new_level_width = int_arg_min(opt, 1);
 			break;

src/options.c

@@ -8,6 +8,7 @@ struct Options options_defaults(void)
 	    .level_path = "",
 	    .tile_width = TILE_WIDTH,
 	    .tile_height = TILE_HEIGHT,
+	    .tile_first = TILE_FIRST,
 	    .tileset_width = 0,
 	    .tileset_height = 0,
 	    .new_level_width = NEW_LEVEL_WIDTH,