[gegl] buffer: short-circuit all samplers to be nearest when doing mipmap processing

[Øyvind Kolås <ok src gnome org>]

commit d53e853e5b2eccc3de4cf09f31690e32358a31a0
Author: Øyvind Kolås <pippin gimp org>
Date:   Thu Jul 3 17:34:48 2014 +0200

    buffer: short-circuit all samplers to be nearest when doing mipmap processing

 gegl/buffer/gegl-sampler.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gegl/buffer/gegl-sampler.c b/gegl/buffer/gegl-sampler.c
index 5276c9e..0e02c0c 100644
--- a/gegl/buffer/gegl-sampler.c
+++ b/gegl/buffer/gegl-sampler.c
@@ -144,6 +144,14 @@ gegl_sampler_get (GeglSampler     *self,
                   void            *output,
                   GeglAbyssPolicy  repeat_mode)
 {
+  if (self->lvel)
+  {
+    double factor = 1.0 / (1 << self->lvel);
+    GeglRectangle rect={floorf (x * factor), floorf (y * factor),1,1};
+    gegl_buffer_get (self->buffer, &rect, factor, self->format, output, GEGL_AUTO_ROWSTRIDE, repeat_mode);
+    return;
+  }
+
   if (gegl_cl_is_accelerated ())
     {
       GeglRectangle rect={x,y,1,1};