[gnome-photos] operation-insta-hefe-curve: Use single precision floating point

[Debarshi Ray <debarshir src gnome org>]

commit ff369cd007fb3f6d50c751c031df0eb6c4c7fb4a
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Dec 11 00:27:54 2017 +0100

    operation-insta-hefe-curve: Use single precision floating point
    
    Single precision floating point is all that's needed. It is wasteful to
    promote calculations to double precision through the use of such
    literals. This can have significant performance impact on architectures
    like ARM.

 src/photos-operation-insta-hefe-curve.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/photos-operation-insta-hefe-curve.c b/src/photos-operation-insta-hefe-curve.c
index 13657f7..c0b37f9 100644
--- a/src/photos-operation-insta-hefe-curve.c
+++ b/src/photos-operation-insta-hefe-curve.c
@@ -71,9 +71,9 @@ photos_operation_insta_hefe_curve_process (GeglOperation *operation,
       const float r2 = r * r;
       const float r3 = r2 * r;
 
-      out[0] = -13.47f * r3 * r3 + 41.23f * r3 * r2 - 45.04f * r2 * r2 + 19.17 * r3 - 1.492f * r2 + 0.5954f 
* r;
-      out[1] = -12.28f * g3 * g3 + 41.09f * g3 * g2 - 50.52f * g2 * g2 + 26.03 * g3 - 3.916f * g2 + 0.58f * 
g;
-      out[2] = -1.066f * b3 * b3 + 9.679f * b3 * b2 - 19.09f * b2 * b2 + 12.92 * b3 - 1.835f * b2 + 0.3487f 
* b;
+      out[0] = -13.47f * r3 * r3 + 41.23f * r3 * r2 - 45.04f * r2 * r2 + 19.17f * r3 - 1.492f * r2 + 0.5954f 
* r;
+      out[1] = -12.28f * g3 * g3 + 41.09f * g3 * g2 - 50.52f * g2 * g2 + 26.03f * g3 - 3.916f * g2 + 0.58f * 
g;
+      out[2] = -1.066f * b3 * b3 + 9.679f * b3 * b2 - 19.09f * b2 * b2 + 12.92f * b3 - 1.835f * b2 + 0.3487f 
* b;
       out[3] = in[3];
 
       in += 4;