Move Image struct and add clear image, set pixel and draw_line functions

src/main.c

@@ -1,26 +1,34 @@
-#include "aliases.h"
+#include "img.h"
 #include "mem_arena.h"
 #include "mem_utils.h"
-#include "pam.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-typedef struct img Image;
-struct img {
-  u64 width;
-  u64 height;
-  u8 *buf;
+enum {
+  TINY_EXIT_SUCCESS,
+  TINY_EXIT_ARENA_INIT_FAILED,
+  TINY_EXIT_IMAGE_INIT_FAILED,
 };
 
 int main(void) {
   Arena *arena = NULL;
   if (!wapp_mem_arena_init(&arena, 10ul * 1024ul * 1024ul * 1024ul,
                            WAPP_MEM_ALLOC_RESERVE, false)) {
-    return -1;
+    return TINY_EXIT_ARENA_INIT_FAILED;
   }
 
+  Colour cyan = {.r = 0, .g = 255, .b = 255, .a = 255};
+  Colour red = {.r = 255, .g = 0, .b = 0, .a = 255};
+  Image img = {.width = 200, .height = 200};
+  if (!init_image(arena, &img)) {
+    return TINY_EXIT_IMAGE_INIT_FAILED;
+  }
+
+  clear_image(&img, cyan);
+  save_image(&img, "result.pam");
+
   wapp_mem_arena_destroy(&arena);
 
-  return 0;
+  return TINY_EXIT_SUCCESS;
 }