[gtk/small-caps: 2/3] css: Change the way case variants are handled

[Matthias Clasen <matthiasc src gnome org>]

commit 26e445666337a9907d6eca55d66a2f44e5f4585e
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 8 08:08:19 2021 -0500

    css: Change the way case variants are handled
    
    Instead of translating font-variant-caps directly
    to OpenType features, translate them to a PangoVariant,
    now that that enumeration reflects all the css values.
    
    This allows pango to emulate Small Caps for fonts that
    don't support the OpenType feature.

 gtk/gtkcssstyle.c | 51 ++++++++++++++++++++++++++-------------------------
 1 file changed, 26 insertions(+), 25 deletions(-)
---
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index 31b5d3e2c9..f03d9b4f1a 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -513,31 +513,6 @@ gtk_css_style_compute_font_features (GtkCssStyle *style)
       break;
     }
 
-  switch (_gtk_css_font_variant_caps_value_get (style->font_variant->font_variant_caps))
-    {
-    case GTK_CSS_FONT_VARIANT_CAPS_SMALL_CAPS:
-      append_separated (&s, "smcp 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_ALL_SMALL_CAPS:
-      append_separated (&s, "c2sc 1, smcp 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_PETITE_CAPS:
-      append_separated (&s, "pcap 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_ALL_PETITE_CAPS:
-      append_separated (&s, "c2pc 1, pcap 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_UNICASE:
-      append_separated (&s, "unic 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_TITLING_CAPS:
-      append_separated (&s, "titl 1");
-      break;
-    case GTK_CSS_FONT_VARIANT_CAPS_NORMAL:
-    default:
-      break;
-    }
-
   numeric = _gtk_css_font_variant_numeric_value_get (style->font_variant->font_variant_numeric);
   if (numeric == GTK_CSS_FONT_VARIANT_NUMERIC_NORMAL)
     {
@@ -675,6 +650,32 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
       }
    }
 
+  /* casing variants */
+  switch (_gtk_css_font_variant_caps_value_get (style->font_variant->font_variant_caps))
+    {
+    case GTK_CSS_FONT_VARIANT_CAPS_SMALL_CAPS:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_SMALL_CAPS));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_ALL_SMALL_CAPS:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_ALL_SMALL_CAPS));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_PETITE_CAPS:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_PETITE_CAPS));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_ALL_PETITE_CAPS:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_ALL_PETITE_CAPS));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_UNICASE:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_UNICASE));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_TITLING_CAPS:
+      attrs = add_pango_attr (attrs, pango_attr_variant_new (PANGO_VARIANT_TITLE_CAPS));
+      break;
+    case GTK_CSS_FONT_VARIANT_CAPS_NORMAL:
+    default:
+      break;
+    }
+
   /* OpenType features */
   {
     char *font_features = gtk_css_style_compute_font_features (style);