[gegl] gegl-utils: extend gegl_babl_variant with CMYK based spaces

[Øyvind "pippin" Kolås <ok src gnome org>]

commit f25ceea6eb3e5cfdbd5c0ab356da19959ec9fca4
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Nov 9 15:47:44 2018 +0100

    gegl-utils: extend gegl_babl_variant with CMYK based spaces
    
    The CMYK spaces only exist in one TRC variant, most math in GEGL is assuming
    operation on additive like spaces - thus the premultiplied/non-premultiplied
    versions returned for CMYK models is the lower-case thus inverted versions
    of encodings.

 gegl/gegl-utils.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
---
diff --git a/gegl/gegl-utils.c b/gegl/gegl-utils.c
index 482f0c2b0..18cf925d1 100644
--- a/gegl/gegl-utils.c
+++ b/gegl/gegl-utils.c
@@ -66,6 +66,15 @@ static const Babl *gegl_babl_format_linear_float (const Babl *format)
   {
     format = babl_format_with_space ("YA float", space);
   }
+  else if (babl_model_is (model, "cmyk") ||
+           babl_model_is (model, "cmykA") ||
+           babl_model_is (model, "camayakaA") ||
+           babl_model_is (model, "CMYK") ||
+           babl_model_is (model, "CMYKA") ||
+           babl_model_is (model, "CaMaYaKaA"))
+  {
+    format  = babl_format_with_space ("cmykA float", space);
+  }
   else if (babl_model_is (model, "RGB") ||
            babl_model_is (model, "R'G'B'") ||
            babl_model_is (model, "R~G~B~"))
@@ -114,6 +123,15 @@ static const Babl *gegl_babl_format_perceptual_float (const Babl *format)
   {
     format = babl_format_with_space ("Y~A float", space);
   }
+  else if (babl_model_is (model, "cmyk") ||
+           babl_model_is (model, "cmykA") ||
+           babl_model_is (model, "camayakaA") ||
+           babl_model_is (model, "CMYK") ||
+           babl_model_is (model, "CMYKA") ||
+           babl_model_is (model, "CaMaYaKaA"))
+  {
+    format  = babl_format_with_space ("cmykA float", space);
+  }
   else if (babl_model_is (model, "RGB") ||
            babl_model_is (model, "R'G'B'") ||
            babl_model_is (model, "R~G~B~"))
@@ -162,6 +180,15 @@ static const Babl *gegl_babl_format_nonlinear_float (const Babl *format)
   {
     format = babl_format_with_space ("Y'A float", space);
   }
+  else if (babl_model_is (model, "cmyk") ||
+           babl_model_is (model, "cmykA") ||
+           babl_model_is (model, "camayakaA") ||
+           babl_model_is (model, "CMYK") ||
+           babl_model_is (model, "CMYKA") ||
+           babl_model_is (model, "CaMaYaKaA"))
+  {
+    format  = babl_format_with_space ("cmykA float", space);
+  }
   else if (babl_model_is (model, "RGB") ||
            babl_model_is (model, "R'G'B'") ||
            babl_model_is (model, "R~G~B~"))
@@ -207,6 +234,15 @@ static const Babl *gegl_babl_format_premultiplied_linear_float (const Babl *form
   {
     format = babl_format_with_space ("YaA float", space);
   }
+  else if (babl_model_is (model, "cmyk") ||
+           babl_model_is (model, "cmykA") ||
+           babl_model_is (model, "camayakaA") ||
+           babl_model_is (model, "CMYK") ||
+           babl_model_is (model, "CMYKA") ||
+           babl_model_is (model, "CaMaYaKaA"))
+  {
+    format  = babl_format_with_space ("camayakaA float", space);
+  }
 #if 0 // just treat as else
   else if (babl_model_is (model, "RGB") ||
            babl_model_is (model, "R'G'B'") ||
@@ -250,6 +286,15 @@ static const Babl *gegl_babl_format_premultiplied_perceptual_float (const Babl *
   {
     format = babl_format_with_space ("Y~aA float", space);
   }
+  else if (babl_model_is (model, "cmyk") ||
+      babl_model_is (model, "cmykA") ||
+      babl_model_is (model, "camayakaA") ||
+      babl_model_is (model, "CMYK") ||
+      babl_model_is (model, "CMYKA") ||
+      babl_model_is (model, "CaMaYaKaA"))
+  {
+    format  = babl_format_with_space ("camayakaA float", space);
+  }
 #if 0 // just treat as else
   else if (babl_model_is (model, "RGB") ||
            babl_model_is (model, "R'G'B'") ||