Add colors black, red, green and blue.

README.md

@@ -4,6 +4,10 @@ desktop. Work in progress. Following are the supported define and functions.
 
 ## `raygint/display.h`
 Macros:
+* `C_BLACK`
+* `C_BLUE`
+* `C_GREEN`
+* `C_RED`
 * `C_WHITE`
 * `DWIDTH`
 * `DHEIGHT`

include/raygint/display.h

@@ -8,9 +8,13 @@
 #include <raylib.h>
 /* Colors. */
 #define C_WHITE WHITE
+#define C_BLACK BLACK
+#define C_RED RED
+#define C_GREEN GREEN
+#define C_BLUE BLUE
 /* Simple functions. */
 #define dclear(c) ClearBackground(c)
-#define drect(x, y, w, h, c) DrawRectangle(x, y, (x) - (w), (y) - (h), c)
+#define drect(x1, y1, x2, y2, c) DrawRectangle(x1, y1, (x2) - (x1), (y2) - (y1), c)
 #endif /* RAYLIB */
 
 #ifdef RAYLIB_CG