---
name: "register_bitmap_file_type"
section: "3alleg4"
platform: "linux"
package: "allegro4-doc"
version: "2:4.4.3.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/register_bitmap_file_type/3alleg4"
---

# register\_bitmap\_file\_type(3alleg4)

Registers custom bitmap loading/saving functions. Allegro game programming library.

## NAME

register\_bitmap\_file\_type - Registers custom bitmap loading/saving functions. Allegro game programming library.

## SYNOPSIS

**#include \<allegro.h\>**

**void register\_bitmap\_file\_type(const char \*ext,** **BITMAP \*(\*load)(const char \*filename, RGB \*pal),** **int (\*save)(const char \*filename, BITMAP \*bmp, const RGB \*pal));**

## DESCRIPTION

Informs the load\_bitmap() and save\_bitmap() functions of a new file type,  providing routines to read and write images in this format (either  function may be NULL). The functions you supply must follow the same prototype as load\_bitmap() and save\_bitmap(). Example:

```
   BITMAP *load_dump(const char *filename, RGB *pal)
   {
      ...
   }
   int save_dump(const char *filename, BITMAP *bmp, const RGB *pal)
   {
      ...
   }
      register_bitmap_file_type("dump", load_dump, save_dump);
```

## SEE ALSO

**load\_bitmap**(3alleg4), **save\_bitmap**(3alleg4)