ented in default builds of the library. You need to #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING in your &lsquo;ftoption.h&rsquo; file in order to activate it.</p>
<p>FreeType generates alpha coverage maps, which are linear by nature. For instance, the value 0x80 in bitmap representation means that (within numerical precision) 0x80/0xff fraction of that pixel is covered by the glyph's outline. The blending function for placing text over a background is</p>
<pre class="colored">
  dst = alpha * src + (1 - alp