* include/freetype/freetype.h (FT_RENDER_MODE_SDF): Improve documentation.

* include/freetype/freetype.h (FT_RENDER_MODE_SDF): Added one more point to the limitations of sdf.
3 years ago · ee0f8213be
parent 31c0a833d6
commit ee0f8213be
1 changed files with 5 additions and 0 deletions
--- a/include/freetype/freetype.h
+++ b/include/freetype/freetype.h
@ -3399,6 +3399,11 @@ FT_BEGIN_HEADER
   *      output due to limited availability of pixel grid to store distance
   *      information.
   *
+   *   4. Since the output buffer is normalized, precision at smaller spread
+   *      will be greater than precision at larger spread values, because the
+   *      output range of [0 .. 255] will be mapped to a smaller sdf range.
+   *      A spread of 2 should be sufficient in most cases.
+   *
   *   Point (1) and (2) can be avoided by using `bsdf` and overall it is
   *   more stable than the `sdf` rasterizer.
   *