[gnome-photos/gnome-3-26] operation-insta-curve: Use single precision floating point

[Debarshi Ray <debarshir src gnome org>]

commit a76c30112be2f53b4aaec3592a4fc84d6d644a4c
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Dec 11 12:46:44 2017 +0100

    operation-insta-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-curve.c |  108 ++++++++++++++++++------------------
 1 files changed, 54 insertions(+), 54 deletions(-)
---
diff --git a/src/photos-operation-insta-curve.c b/src/photos-operation-insta-curve.c
index c927c5e..10f7212 100644
--- a/src/photos-operation-insta-curve.c
+++ b/src/photos-operation-insta-curve.c
@@ -442,7 +442,7 @@ photos_operation_insta_curve_brannan_process_alpha_float (GeglOperation *operati
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat saturation = 0.1;
+      const gfloat saturation = 0.1f;
       guint max;
 
       out[0] = photos_operation_insta_curve_interpolate (in[0], BRANNAN_R, BRANNAN_A);
@@ -453,13 +453,13 @@ photos_operation_insta_curve_brannan_process_alpha_float (GeglOperation *operati
       max = (out[max] > out[2]) ? max : 2;
 
       if (max != 0)
-        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5);
+        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5f);
 
       if (max != 1)
-        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5);
+        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5f);
 
       if (max != 2)
-        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5);
+        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5f);
 
       out[3] = in[3];
 
@@ -483,7 +483,7 @@ photos_operation_insta_curve_brannan_process_alpha_u8 (GeglOperation *operation,
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat saturation = 0.1;
+      const gfloat saturation = 0.1f;
       guint max;
 
       out[0] = BRANNAN_R[in[0]];
@@ -498,13 +498,13 @@ photos_operation_insta_curve_brannan_process_alpha_u8 (GeglOperation *operation,
       max = (out[max] > out[2]) ? max : 2;
 
       if (max != 0)
-        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5);
+        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5f);
 
       if (max != 1)
-        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5);
+        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5f);
 
       if (max != 2)
-        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5);
+        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5f);
 
       out[3] = in[3];
 
@@ -528,7 +528,7 @@ photos_operation_insta_curve_brannan_process_float (GeglOperation *operation,
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat saturation = 0.1;
+      const gfloat saturation = 0.1f;
       guint max;
 
       out[0] = photos_operation_insta_curve_interpolate (in[0], BRANNAN_R, BRANNAN_A);
@@ -539,13 +539,13 @@ photos_operation_insta_curve_brannan_process_float (GeglOperation *operation,
       max = (out[max] > out[2]) ? max : 2;
 
       if (max != 0)
-        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5);
+        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5f);
 
       if (max != 1)
-        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5);
+        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5f);
 
       if (max != 2)
-        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5);
+        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5f);
 
       in += 3;
       out += 3;
@@ -567,7 +567,7 @@ photos_operation_insta_curve_brannan_process_u8 (GeglOperation *operation,
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat saturation = 0.1;
+      const gfloat saturation = 0.1f;
       guint max;
 
       out[0] = BRANNAN_R[in[0]];
@@ -582,13 +582,13 @@ photos_operation_insta_curve_brannan_process_u8 (GeglOperation *operation,
       max = (out[max] > out[2]) ? max : 2;
 
       if (max != 0)
-        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5);
+        out[0] += (guint8) ((out[max] - out[0]) * saturation + 0.5f);
 
       if (max != 1)
-        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5);
+        out[1] += (guint8) ((out[max] - out[1]) * saturation + 0.5f);
 
       if (max != 2)
-        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5);
+        out[2] += (guint8) ((out[max] - out[2]) * saturation + 0.5f);
 
       in += 3;
       out += 3;
@@ -717,12 +717,12 @@ photos_operation_insta_curve_nashville_process_alpha_float (GeglOperation *opera
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat brightness = -0.05;
-      const gfloat contrast = 1.1;
+      const gfloat brightness = -0.05f;
+      const gfloat contrast = 1.1f;
 
-      out[0] = (in[0] - 0.5f) * contrast + brightness + 0.5;
-      out[1] = (in[1] - 0.5f) * contrast + brightness + 0.5;
-      out[2] = (in[2] - 0.5f) * contrast + brightness + 0.5;
+      out[0] = (in[0] - 0.5f) * contrast + brightness + 0.5f;
+      out[1] = (in[1] - 0.5f) * contrast + brightness + 0.5f;
+      out[2] = (in[2] - 0.5f) * contrast + brightness + 0.5f;
 
       out[0] = photos_operation_insta_curve_interpolate (out[0], NASHVILLE_R, NASHVILLE_A);
       out[1] = photos_operation_insta_curve_interpolate (out[1], NASHVILLE_G, NASHVILLE_A);
@@ -750,24 +750,24 @@ photos_operation_insta_curve_nashville_process_alpha_u8 (GeglOperation *operatio
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat brightness = -0.05;
-      const gfloat contrast = 1.1;
+      const gfloat brightness = -0.05f;
+      const gfloat contrast = 1.1f;
       gfloat channel;
 
-      channel = in[0] / 255.0;
-      channel = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[0] = (guint8) (channel * 255.0);
+      channel = in[0] / 255.0f;
+      channel = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[0] = (guint8) (channel * 255.0f);
 
-      channel = in[1] / 255.0;
-      out[1] = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[1] = (guint8) (channel * 255.0);
+      channel = in[1] / 255.0f;
+      out[1] = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[1] = (guint8) (channel * 255.0f);
 
-      channel = in[2] / 255.0;
-      out[2] = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[2] = (guint8) (channel * 255.0);
+      channel = in[2] / 255.0f;
+      out[2] = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[2] = (guint8) (channel * 255.0f);
 
       out[0] = NASHVILLE_R[out[0]];
       out[1] = NASHVILLE_G[out[1]];
@@ -799,12 +799,12 @@ photos_operation_insta_curve_nashville_process_float (GeglOperation *operation,
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat brightness = -0.05;
-      const gfloat contrast = 1.1;
+      const gfloat brightness = -0.05f;
+      const gfloat contrast = 1.1f;
 
-      out[0] = (in[0] - 0.5f) * contrast + brightness + 0.5;
-      out[1] = (in[1] - 0.5f) * contrast + brightness + 0.5;
-      out[2] = (in[2] - 0.5f) * contrast + brightness + 0.5;
+      out[0] = (in[0] - 0.5f) * contrast + brightness + 0.5f;
+      out[1] = (in[1] - 0.5f) * contrast + brightness + 0.5f;
+      out[2] = (in[2] - 0.5f) * contrast + brightness + 0.5f;
 
       out[0] = photos_operation_insta_curve_interpolate (out[0], NASHVILLE_R, NASHVILLE_A);
       out[1] = photos_operation_insta_curve_interpolate (out[1], NASHVILLE_G, NASHVILLE_A);
@@ -830,24 +830,24 @@ photos_operation_insta_curve_nashville_process_u8 (GeglOperation *operation,
 
   for (i = 0; i < n_pixels; i++)
     {
-      const gfloat brightness = -0.05;
-      const gfloat contrast = 1.1;
+      const gfloat brightness = -0.05f;
+      const gfloat contrast = 1.1f;
       gfloat channel;
 
-      channel = in[0] / 255.0;
-      channel = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[0] = (guint8) (channel * 255.0);
+      channel = in[0] / 255.0f;
+      channel = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[0] = (guint8) (channel * 255.0f);
 
-      channel = in[1] / 255.0;
-      out[1] = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[1] = (guint8) (channel * 255.0);
+      channel = in[1] / 255.0f;
+      out[1] = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[1] = (guint8) (channel * 255.0f);
 
-      channel = in[2] / 255.0;
-      out[2] = (channel - 0.5f) * contrast + brightness + 0.5;
-      channel = CLAMP (channel, 0.0, 1.0);
-      out[2] = (guint8) (channel * 255.0);
+      channel = in[2] / 255.0f;
+      out[2] = (channel - 0.5f) * contrast + brightness + 0.5f;
+      channel = CLAMP (channel, 0.0f, 1.0f);
+      out[2] = (guint8) (channel * 255.0f);
 
       out[0] = NASHVILLE_R[out[0]];
       out[1] = NASHVILLE_G[out[1]];