From 434134454527f604e5993f1661720e3536d8c7a3 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Sun, 2 Jun 2024 11:04:09 -0400
Subject: [PATCH] css: Add a utility for color space coords

---
 gtk/gtkcsscolor.c        | 55 ++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcsscolorprivate.h |  3 +++
 2 files changed, 58 insertions(+)

diff --git a/gtk/gtkcsscolor.c b/gtk/gtkcsscolor.c
index 66830ad5fd..63907d67bc 100644
--- a/gtk/gtkcsscolor.c
+++ b/gtk/gtkcsscolor.c
@@ -157,6 +157,61 @@ gtk_css_color_to_string (const GtkCssColor *color)
   return g_string_free (gtk_css_color_print (color, FALSE, g_string_new ("")), FALSE);
 }
 
+const char *
+gtk_css_color_space_get_coord_name (GtkCssColorSpace color_space,
+                                    guint            coord)
+{
+  if (coord == 3)
+    return "alpha";
+
+  switch (color_space)
+    {
+    case GTK_CSS_COLOR_SPACE_SRGB:
+    case GTK_CSS_COLOR_SPACE_SRGB_LINEAR:
+      switch (coord)
+        {
+        case 0: return "r";
+        case 1: return "g";
+        case 2: return "b";
+        default: g_assert_not_reached ();
+        }
+    case GTK_CSS_COLOR_SPACE_HSL:
+      switch (coord)
+        {
+        case 0: return "h";
+        case 1: return "s";
+        case 2: return "l";
+        default: g_assert_not_reached ();
+        }
+    case GTK_CSS_COLOR_SPACE_HWB:
+      switch (coord)
+        {
+        case 0: return "h";
+        case 1: return "w";
+        case 2: return "b";
+        default: g_assert_not_reached ();
+        }
+    case GTK_CSS_COLOR_SPACE_OKLAB:
+      switch (coord)
+        {
+        case 0: return "l";
+        case 1: return "a";
+        case 2: return "b";
+        default: g_assert_not_reached ();
+        }
+    case GTK_CSS_COLOR_SPACE_OKLCH:
+      switch (coord)
+        {
+        case 0: return "l";
+        case 1: return "c";
+        case 2: return "h";
+        default: g_assert_not_reached ();
+        }
+    default:
+      g_assert_not_reached ();
+    }
+}
+
 /* }}} */
 /* {{{ Color conversion */
 
diff --git a/gtk/gtkcsscolorprivate.h b/gtk/gtkcsscolorprivate.h
index 5ed457d224..f48764f410 100644
--- a/gtk/gtkcsscolorprivate.h
+++ b/gtk/gtkcsscolorprivate.h
@@ -109,4 +109,7 @@ void    gtk_css_color_interpolate (const GtkCssColor      *from,
                                    GtkCssHueInterpolation  interp,
                                    GtkCssColor            *output);
 
+const char * gtk_css_color_space_get_coord_name (GtkCssColorSpace color_space,
+                                                 guint            coord);
+
 G_END_DECLS