Add "al_is_image_addon_initialized"

Author: MarkOates

addons/image/allegro5/allegro_image.h

@@ -32,6 +32,7 @@ extern "C" {
 
 
 ALLEGRO_IIO_FUNC(bool, al_init_image_addon, (void));
+ALLEGRO_IIO_FUNC(bool, al_is_image_addon_initialized, (void));
 ALLEGRO_IIO_FUNC(void, al_shutdown_image_addon, (void));
 ALLEGRO_IIO_FUNC(uint32_t, al_get_allegro_image_version, (void));
 

addons/image/iio.c

@@ -164,6 +164,14 @@ bool al_init_image_addon(void)
 }
 
 
+/* Function: al_is_image_addon_initialized
+ */
+bool is_image_addon_initialized(void)
+{
+   return iio_inited;
+}
+
+
 /* Function: al_shutdown_image_addon
  */
 void al_shutdown_image_addon(void)

docs/src/refman/image.txt

@@ -29,6 +29,10 @@ contains textures compressed in the DXT1, DXT3 and DXT5 formats. Note that when
 loading a DDS file, the created bitmap will always be a video bitmap and will
 have the pixel format matching the format in the file.
 
+## API: al_is_image_addon_initialized
+
+Returns true if the image addon has been initialized, otherwise returns false.
+
 ## API: al_shutdown_image_addon
 
 Shut down the image addon. This is done automatically at program exit,