Re: [Dev-C++] Help with ALLEGRO question

I don't run allegro, so I haven't the header files and can compare them
but:

your add_blender8() is a function, and you send it in as a function
pointer to the create_color_table function. The compiler error on the
other hand seem to list a parameter list taking an integer as third
parameter, i.e. the result of the call to add_blender8(xxx).

/Per W


On Tue, 29 Apr 2003, Louis Godio wrote:

> Hi,
> I'm new to the ALLEGRO  package and when trying to compile this code
> segment:
>
>     /* for generating the 8 bit additive color lookup table */
> static void add_blender8 (PALETTE pal, int x, int y, RGB *rgb)
>     {  int r, g, b;
>        r = (int)pal[x].r + (int)pal[y].r;
>        g = (int)pal[x].g + (int)pal[y].g;
>        b = (int)pal[x].b + (int)pal[y].b;
>        rgb->r = MIN(r, 63);
>        rgb->g = MIN(g, 63);
>        rgb->b = MIN(b, 63);
>     }
>
> int main ();
> .....
>
>
>       PALETTE pal;
>       COLOR_MAP * color_map;
>       RGB_MAP * rgb_map;
>
>       color_map = (COLOR_MAP *) malloc(sizeof(COLOR_MAP));
>
>       create_color_table (color_map, pal, add_blender8, NULL);
> .....
>
>
> I get the compiler error:
>
>       converting `void (*)(RGB *, int, int, RGB *)' to
>                  `void (*)(const RGB *, int, int, RGB *)' is a
>       contravariance violation.
>
>
> Can any ALLEGRO experts help me on eliminating this error ?
>
>
>
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