Render text working.

src/asset/asset.h

@@ -11,6 +11,7 @@
 #include <zip.h>
 
 #include "asset/type/assetpaletteimage.h"
+#include "asset/type/assetalphaimage.h"
 
 #define ASSET_HEADER_SIZE 3
 #define ASSET_REFERENCE_COUNT_MAX 8
@@ -29,6 +30,7 @@ typedef enum {
 typedef enum {
   ASSET_TYPE_UNKNOWN,
   ASSET_TYPE_PALETTE_IMAGE,
+  ASSET_TYPE_ALPHA_IMAGE,
 
   ASSET_TYPE_COUNT
 } assettype_t;
@@ -43,12 +45,14 @@ typedef struct asset_s {
 
   union {
     assetpaletteimage_t paletteImage;
+    assetalphaimager_t alphaImage;
   };
 } asset_t;
 
 typedef struct {
   const char_t header[ASSET_HEADER_SIZE + 1];
   errorret_t (*load)(asset_t *asset);
+  errorret_t (*dispose)(asset_t *asset);
 } assetdef_t;
 
 extern assetdef_t ASSET_DEFINITIONS[ASSET_TYPE_COUNT];
@@ -97,4 +101,4 @@ errorret_t assetLoad(asset_t *asset);
  * 
  * @param asset The asset to dispose of.
  */
-void assetDispose(asset_t *asset);
+errorret_t assetDispose(asset_t *asset);