Add basic implementation for bitmap font

src/BitmapFont.c

@@ -0,0 +1,83 @@
+#include "BitmapFont.h"
+#include "AssetManager.h"
+#include "Renderer.h"
+#include "SDL_render.h"
+#include "aliases.h"
+#include "reusable_ids.h"
+#include <stdlib.h>
+
+struct bitmap_font {
+  AssetID font_atlas;
+  u64 width;
+  u64 height;
+  u64 tile_width;
+  u64 tile_height;
+  u64 rows;
+  u64 cols;
+};
+
+BitmapFont *load_bitmap_font(AssetManager *am, const Renderer *renderer,
+                             const char *filepath, u64 tile_width,
+                             u64 tile_height) {
+  BitmapFont *font = (BitmapFont *)malloc(sizeof(BitmapFont));
+  if (!font) {
+    return NULL;
+  }
+
+  font->font_atlas =
+      load_asset_to_manager(am, filepath, ASSET_TYPE_IMAGE, renderer);
+
+  if (font->font_atlas == INVALID_ID) {
+    unload_bitmap_font(am, &font);
+
+    return NULL;
+  }
+
+  SDL_Texture *texture = get_texture(am, font->font_atlas);
+
+  i32 w;
+  i32 h;
+
+  if (SDL_QueryTexture(texture, NULL, NULL, &w, &h) != 0) {
+    unload_bitmap_font(am, &font);
+
+    return NULL;
+  }
+
+  font->width = w;
+  font->height = h;
+
+  font->tile_width = tile_width;
+  font->tile_height = tile_height;
+
+  font->rows = font->height / font->tile_height;
+  font->cols = font->width / font->tile_width;
+
+  return font;
+}
+
+RenderRect get_character_sprite(BitmapFont *font, u64 index) {
+  u64 col = index % font->cols;
+  u64 row = index / font->cols;
+
+  RenderRect rect = {
+      .x = col * font->tile_width,
+      .y = row * font->tile_height,
+      .width = font->tile_width,
+      .height = font->tile_height,
+  };
+
+  return rect;
+}
+
+void unload_bitmap_font(AssetManager *am, BitmapFont **font) {
+  if (!am || !(*font)) {
+    return;
+  }
+
+  remove_asset_from_manager(am, &((*font)->font_atlas));
+
+  free(*font);
+
+  *font = NULL;
+}