From f9612533c23d18ad1babeeb545aaa5a13d09a656 Mon Sep 17 00:00:00 2001
From: Matthias Clasen <mclasen@redhat.com>
Date: Wed, 31 Jul 2024 19:59:09 -0400
Subject: [PATCH] css: Add gtk_css_color_to_color

This api lets one obtain a color state and color values from
a GtkCssColor. We don't want to force everything though sRGB,
but we can't quite avoid conversion here, since we don't have
a 100% match between the css color spaces and color states.

css color cleanup
---
 gtk/gtkcsscolor.c        | 48 ++++++++++++++++++++++++++++++++++++++++
 gtk/gtkcsscolorprivate.h | 10 +++++++++
 2 files changed, 58 insertions(+)

diff --git a/gtk/gtkcsscolor.c b/gtk/gtkcsscolor.c
index 5604ef72dd..00c51132a1 100644
--- a/gtk/gtkcsscolor.c
+++ b/gtk/gtkcsscolor.c
@@ -19,6 +19,7 @@
 
 #include "gtkcsscolorprivate.h"
 #include "gtkcolorutilsprivate.h"
+#include "gdkcolorstateprivate.h"
 
 /* {{{ Initialization */
 
@@ -1163,5 +1164,52 @@ gtk_css_color_interpolation_method_print (GtkCssColorSpace        in,
   }
 }
 
+/* }}} */
+/* {{{ GdkColor conversion */
+
+void
+gtk_css_color_to_color (const GtkCssColor *css,
+                        GdkColor          *color)
+{
+  switch (css->color_space)
+    {
+    case GTK_CSS_COLOR_SPACE_SRGB:
+      gdk_color_init (color, GDK_COLOR_STATE_SRGB, css->values);
+      break;
+
+    case GTK_CSS_COLOR_SPACE_SRGB_LINEAR:
+      gdk_color_init (color, GDK_COLOR_STATE_SRGB_LINEAR, css->values);
+      break;
+
+    case GTK_CSS_COLOR_SPACE_REC2100_PQ:
+      gdk_color_init (color, GDK_COLOR_STATE_REC2100_PQ, css->values);
+      break;
+
+    case GTK_CSS_COLOR_SPACE_HSL:
+    case GTK_CSS_COLOR_SPACE_HWB:
+    case GTK_CSS_COLOR_SPACE_OKLAB:
+    case GTK_CSS_COLOR_SPACE_OKLCH:
+      {
+        GtkCssColor tmp;
+        gtk_css_color_convert (css, GTK_CSS_COLOR_SPACE_SRGB, &tmp);
+        gdk_color_init (color, GDK_COLOR_STATE_SRGB, tmp.values);
+      }
+      break;
+
+    case GTK_CSS_COLOR_SPACE_REC2020:
+    case GTK_CSS_COLOR_SPACE_DISPLAY_P3:
+    case GTK_CSS_COLOR_SPACE_XYZ:
+      {
+        GtkCssColor tmp;
+        gtk_css_color_convert (css, GTK_CSS_COLOR_SPACE_REC2100_PQ, &tmp);
+        gdk_color_init (color, GDK_COLOR_STATE_REC2100_PQ, tmp.values);
+      }
+      break;
+
+    default:
+      g_assert_not_reached ();
+    }
+}
+
 /* }}} */
 /* vim:set foldmethod=marker expandtab: */
diff --git a/gtk/gtkcsscolorprivate.h b/gtk/gtkcsscolorprivate.h
index 5b88a023ac..afaee054ea 100644
--- a/gtk/gtkcsscolorprivate.h
+++ b/gtk/gtkcsscolorprivate.h
@@ -22,6 +22,7 @@
 
 #include "gtk/css/gtkcssparserprivate.h"
 #include "gtkcsstypesprivate.h"
+#include "gdk/gdkcolorprivate.h"
 
 G_BEGIN_DECLS
 
@@ -115,4 +116,13 @@ void gtk_css_color_interpolation_method_print (GtkCssColorSpace        in,
                                                GtkCssHueInterpolation  interp,
                                                GString                *string);
 
+static inline gboolean
+gtk_css_color_is_clear (const GtkCssColor *color)
+{
+  return color->values[3] < (float) 0x00ff / (float) 0xffff;
+}
+
+void gtk_css_color_to_color (const GtkCssColor *css,
+                             GdkColor          *color);
+
 G_END_DECLS