typedef struct 
{
int  w       __attribute__((packed));
int  h       __attribute__((packed));
char *bmp    __attribute__((packed));
char *alpha  __attribute__((packed));
} GB_BMP     __attribute__((packed));


void (* __stdcall gb_pixel_set)(GB_BMP *b, int x, int y, unsigned c);
int  (* __stdcall gb_pixel_get)(GB_BMP *b, int x, int y, unsigned *c);
void (* __stdcall gb_line)(GB_BMP *b, int x1, int y1, int x2, int y2, unsigned c);
void (* __stdcall gb_rect)(GB_BMP *b, int x, int y, int w, int h, unsigned c);
void (* __stdcall gb_bar)(GB_BMP *b, int x, int y, int w, int h, unsigned c);
void (* __stdcall gb_circle)(GB_BMP *b, int x, int y, int r, unsigned c);
void (* __stdcall gb_image_set)(GB_BMP *b_dest, int x_d, int y_d, GB_BMP *b_src, int x_s, int y_s, int w, int h);
void (* __stdcall gb_image_set_t)(GB_BMP *b_dest, int x_d, int y_d, GB_BMP *b_src, int x_s, int y_s, int w, int h, unsigned c);