ERING is not defined in your build of the library, which should correspond to all default builds of FreeType.</p>
<p>The filter affects glyph bitmaps rendered through <a href="ft2-base_interface.html#FT_Render_Glyph">FT_Render_Glyph</a>, <a href="ft2-outline_processing.html#FT_Outline_Get_Bitmap">FT_Outline_Get_Bitmap</a>, <a href="ft2-base_interface.html#FT_Load_Glyph">FT_Load_Glyph</a>, and <a href="ft2-base_interface.html#FT_Load_Char">FT_Load_Char</a>.</p>
<p>It does <i>not</i> affect the output of <a h