[Git][freetype/freetype][1100-sdf-precision-improvement] * include/freetype/freetype.h (FT_RENDER_MODE_SDF): Improve documentation.

[Anuj Verma (@anujv)]

Anuj Verma pushed to branch 1100-sdf-precision-improvement at FreeType / FreeType

Commits:

• ee0f8213
  by Anuj Verma at 2021-10-16T10:30:06+05:30

  * 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.
  

1 changed file:

• include/freetype/freetype.h

Changes:

include/freetype/freetype.h

---

...	...	@@ -3399,6 +3399,11 @@ FT_BEGIN_HEADER
3399	3399	* output due to limited availability of pixel grid to store distance
3400	3400	* information.
3401	3401	*
	3402	+ * 4. Since the output buffer is normalized, precision at smaller spread
	3403	+ * will be greater than precision at larger spread values, because the
	3404	+ * output range of [0 .. 255] will be mapped to a smaller sdf range.
	3405	+ * A spread of 2 should be sufficient in most cases.
	3406	+ *
3402	3407	* Point (1) and (2) can be avoided by using `bsdf` and overall it is
3403	3408	* more stable than the `sdf` rasterizer.
3404	3409	*

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