Document the SDF spread further.

8 months ago · 4e079f6357
parent e2bcca40ca
commit 4e079f6357
1 changed files with 2 additions and 1 deletions
--- a/include/freetype/ftdriver.h
+++ b/include/freetype/ftdriver.h
@ -830,7 +830,8 @@ FT_BEGIN_HEADER
   *   the result clamped to the 8-bit range [0..255].  Therefore, 'spread'
   *   is also the maximum euclidean distance from the edge after which the
   *   values are clamped.  The spread is specified in pixels with the
-   *   default value of 8.
+   *   default value of 8.  For accurate SDF texture mapping (interpolation),
+   *   the spread should be large enough to accommodate the target grid unit.
   *
   * @example:
   *   The following example code demonstrates how to set the SDF spread