Loads a bitmap from a file. The palette data will be stored in the second
parameter, which should be an array of 256 RGB structures. At present this
function supports BMP, LBM, PCX, and TGA files, determining the type from
the file extension.
If the file contains a truecolor image, you must set the video mode or
call set_color_conversion() before loading it. In this case, if the
destination color depth is 8-bit, the palette will be generated by calling
generate_optimized_palette() on the bitmap; otherwise, the returned
palette will be generated by calling generate_332_palette().
The pal argument may be NULL. In this case, the palette data are simply
not returned. Additionally, if the file is a truecolor image and the
destination color depth is 8-bit, the color conversion process will use
the current palette instead of generating an optimized one.
Example:
BITMAP *bmp;
PALETTE palette;
...
bmp = load_bitmap("image.pcx", palette);
if (!bmp)
abort_on_error("Couldn't load image.pcx!");
...
destroy_bitmap(bmp);
Returns a pointer to the bitmap or NULL on error. Remember that you are
responsible for destroying the bitmap when you are finished with it to
avoid memory leaks.
