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<section id="slots-and-c-api-making-functions-and-data-available-from-other-modules">
<p>One example is pg_RGBAFromObj where the implementation is defined in base.c, and also exported in base.c (and _pygame.h).</p>
<p>base.c has this exposing the pg_RGBAFromObj function to the <cite>c_api</cite> structure:</p>
<blockquote>
<div><p>c_api[12] = pg_RGBAFromObj;</p>
</div></blockquote>
<p>Then in src_c/include/_pygame.h there is an</p>
<blockquote>
<div><p>#define pg_RGBAFromObj.</p>
</div></blockquote>
<p>Also in _pygame.h, it needs to define the number of slots the base module uses. This is PYGAMEAPI_BASE_NUMSLOTS. So if you were adding another function, you need to increment this PYGAMEAPI_BASE_NUMSLOTS number.</p>
<p>Then to use the pg_RGBAFromObj in other files,</p>
<ol class="arabic">
<li><p>include the "pygame.h" file,</p></li>
<li><p>they have to make sure base is imported with:</p>
<blockquote>
<div><p>import_pygame_base();</p>
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<p>Examples that use pg_RGBAFromObj are: _freetype.c, color.c, gfxdraw.c, and surface.c.</p>
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