[gimp] app: drop alpha from all fishes in gimpgradient.c

[Michael Natterer <mitch src gnome org>]

commit 0c066f311e3024a90fe835feb9f89906d7882fb4
Author: Michael Natterer <mitch gimp org>
Date:   Sat Apr 14 21:09:01 2018 +0200

    app: drop alpha from all fishes in gimpgradient.c
    
    Alpha is calculated separately, ne need to run it through babl.
    Also some formatting cleanup.

 app/core/gimpgradient.c |   58 +++++++++++++++++++++++++---------------------
 1 files changed, 31 insertions(+), 27 deletions(-)
---
diff --git a/app/core/gimpgradient.c b/app/core/gimpgradient.c
index 3a269b4..1d9e2fc 100644
--- a/app/core/gimpgradient.c
+++ b/app/core/gimpgradient.c
@@ -101,7 +101,7 @@ G_DEFINE_TYPE_WITH_CODE (GimpGradient, gimp_gradient, GIMP_TYPE_DATA,
 static const Babl *fish_srgb_to_linear_rgb = NULL;
 static const Babl *fish_linear_rgb_to_srgb = NULL;
 static const Babl *fish_srgb_to_cie_lab    = NULL;
-static const Babl *fish_cie_lab_a_to_srgb  = NULL;
+static const Babl *fish_cie_lab_to_srgb    = NULL;
 
 
 static void
@@ -128,12 +128,12 @@ gimp_gradient_class_init (GimpGradientClass *klass)
 
   fish_srgb_to_linear_rgb = babl_fish (babl_format ("R'G'B' double"),
                                        babl_format ("RGB double"));
-  fish_linear_rgb_to_srgb = babl_fish (babl_format ("RGBA double"),
-                                       babl_format ("R'G'B'A double"));
+  fish_linear_rgb_to_srgb = babl_fish (babl_format ("RGB double"),
+                                       babl_format ("R'G'B' double"));
   fish_srgb_to_cie_lab    = babl_fish (babl_format ("R'G'B' double"),
                                        babl_format ("CIE Lab double"));
-  fish_cie_lab_a_to_srgb  = babl_fish (babl_format ("CIE Lab alpha double"),
-                                       babl_format ("R'G'B'A double"));
+  fish_cie_lab_to_srgb    = babl_fish (babl_format ("CIE Lab double"),
+                                       babl_format ("R'G'B' double"));
 }
 
 static void
@@ -522,19 +522,21 @@ gimp_gradient_get_color_at (GimpGradient                *gradient,
     {
       switch (blend_color_space)
         {
-          case GIMP_GRADIENT_BLEND_CIE_LAB:
-            babl_process (fish_srgb_to_cie_lab,
-                          &left_color, &left_color, 1);
-            babl_process (fish_srgb_to_cie_lab,
-                          &right_color, &right_color, 1);
-            break;
-          case GIMP_GRADIENT_BLEND_RGB_LINEAR:
-            babl_process (fish_srgb_to_linear_rgb,
-                          &left_color, &left_color, 1);
-            babl_process (fish_srgb_to_linear_rgb,
-                          &right_color, &right_color, 1);
-          case GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL:
-            break;
+        case GIMP_GRADIENT_BLEND_CIE_LAB:
+          babl_process (fish_srgb_to_cie_lab,
+                        &left_color, &left_color, 1);
+          babl_process (fish_srgb_to_cie_lab,
+                        &right_color, &right_color, 1);
+          break;
+
+        case GIMP_GRADIENT_BLEND_RGB_LINEAR:
+          babl_process (fish_srgb_to_linear_rgb,
+                        &left_color, &left_color, 1);
+          babl_process (fish_srgb_to_linear_rgb,
+                        &right_color, &right_color, 1);
+
+        case GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL:
+          break;
         }
 
       rgb.r = left_color.r + (right_color.r - left_color.r) * factor;
@@ -543,15 +545,17 @@ gimp_gradient_get_color_at (GimpGradient                *gradient,
 
       switch (blend_color_space)
         {
-          case GIMP_GRADIENT_BLEND_CIE_LAB:
-            babl_process (fish_cie_lab_a_to_srgb,
-                          &rgb, &rgb, 1);
-            break;
-          case GIMP_GRADIENT_BLEND_RGB_LINEAR:
-            babl_process (fish_linear_rgb_to_srgb,
-                          &rgb, &rgb, 1);
-          case GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL:
-            break;
+        case GIMP_GRADIENT_BLEND_CIE_LAB:
+          babl_process (fish_cie_lab_to_srgb,
+                        &rgb, &rgb, 1);
+          break;
+
+        case GIMP_GRADIENT_BLEND_RGB_LINEAR:
+          babl_process (fish_linear_rgb_to_srgb,
+                        &rgb, &rgb, 1);
+
+        case GIMP_GRADIENT_BLEND_RGB_PERCEPTUAL:
+          break;
         }
     }
   else