[gegl] docs/web: add mipmap preview rendering to feature list

[Øyvind Kolås <ok src gnome org>]

commit dc7d610116b3c5de678ac2d9c1704be6ec7e1706
Author: Øyvind Kolås <pippin gimp org>
Date:   Mon Feb 27 11:30:31 2017 +0100

    docs/web: add mipmap preview rendering to feature list

 docs/features.txt |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)
---
diff --git a/docs/features.txt b/docs/features.txt
index ebfb188..9e6431c 100644
--- a/docs/features.txt
+++ b/docs/features.txt
@@ -12,8 +12,9 @@ GEGL Feature List
      * Processes subregions and dependencies.
      * Subgraph caches to aid performance of non-destructive editing.
      * Multi-threaded processing.
-     * Experimental OpenCL acceleration, with possibility of hybrid cpu/gpu
-       processing.
+     * OpenCL acceleration, capable of hybrid cpu/gpu processing.
+     * Experimental mipmap preview rendering, do zoomed out preview 
+       rendering touching only 25% 6.25% of the pixels.
   - link:api.html#GeglBuffer[GeglBuffer]
      * Storage of all babl supported formats.
      * Sparse swapped buffers (larger than RAM images).
@@ -35,6 +36,7 @@ GEGL Feature List
       * HDR exposure merging and tone mapping operations.
       * Most operations operate in
         http://en.wikipedia.org/wiki/ScRGB_color_space[scRGB] (using 32bit
-        floating point/HDR linear light RGBA)
+        floating point/HDR linear light RGBA), operations use babl formats to
+        specify whether they work on linearized data or.
   - Bounding box based hit detection.
   - XML serialization format (not-finalized)