[gtk+] css: Implement font-variant-caps

[Matthias Clasen <matthiasc src gnome org>]

commit 8525afc4081e88ba4e58c7a9f90f8721d2478590
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Sep 18 00:12:12 2017 -0400

    css: Implement font-variant-caps
    
    This gets translated to the corresponding OpenType features.

 gtk/gtkcssstyle.c             |   33 +++++++++++++++++++++++++++++++++
 gtk/gtkcssstylepropertyimpl.c |   24 ++++++++++++++++++++++++
 gtk/gtkcsstypesprivate.h      |    1 +
 3 files changed, 58 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssstyle.c b/gtk/gtkcssstyle.c
index a0bdc8d..8b35f0e 100644
--- a/gtk/gtkcssstyle.c
+++ b/gtk/gtkcssstyle.c
@@ -228,6 +228,7 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
   GtkCssValue *kerning;
   GtkCssValue *ligatures;
   GtkCssValue *position;
+  GtkCssValue *caps;
   GString *s;
   int i;
 
@@ -312,6 +313,38 @@ gtk_css_style_get_pango_attributes (GtkCssStyle *style)
       g_string_append (s, "sups 1");
     }
 
+  caps = gtk_css_style_get_value (style, GTK_CSS_PROPERTY_FONT_VARIANT_CAPS);
+  if (strcmp (_gtk_css_ident_value_get (caps), "small-caps") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "smcp 1");
+    }
+  else if (strcmp (_gtk_css_ident_value_get (caps), "all-small-caps") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "c2sc 1, smcp 1");
+    }
+  else if (strcmp (_gtk_css_ident_value_get (caps), "petite-caps") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "pcap 1");
+    }
+  else if (strcmp (_gtk_css_ident_value_get (caps), "all-petite-caps") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "c2pc 1, pcap 1");
+    }
+  else if (strcmp (_gtk_css_ident_value_get (caps), "unicase") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "unic 1");
+    }
+  else if (strcmp (_gtk_css_ident_value_get (caps), "titling-caps") == 0)
+    {
+      if (s->len > 0) g_string_append (s, ", ");
+      g_string_append (s, "titl 1");
+    }
+
   attrs = add_pango_attr (attrs, pango_attr_font_features_new (s->str));
   g_string_free (s, TRUE);
 
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index 3514dc2..12b4f3c 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -642,6 +642,22 @@ parse_font_variant_position (GtkCssStyleProperty *property,
 }
 
 static GtkCssValue *
+parse_font_variant_caps (GtkCssStyleProperty *property,
+                         GtkCssParser        *parser)
+{
+  GtkCssValue *value = NULL;
+
+  value = _gtk_css_ident_value_try (parser, "normal",
+                                            "small-caps", "all-small-caps",
+                                            "petite-caps", "all-petite-caps",
+                                            "unicase", "titling-caps", NULL);
+  if (value == NULL)
+    _gtk_css_parser_error (parser, "unknown value for property");
+
+  return value;
+}
+
+static GtkCssValue *
 box_shadow_value_parse (GtkCssStyleProperty *property,
                         GtkCssParser        *parser)
 {
@@ -1150,6 +1166,14 @@ _gtk_css_style_property_init_properties (void)
                                           parse_font_variant_position,
                                           NULL,
                                           _gtk_css_ident_value_new ("normal"));
+  gtk_css_style_property_register        ("font-variant-caps",
+                                          GTK_CSS_PROPERTY_FONT_VARIANT_CAPS,
+                                          G_TYPE_NONE,
+                                          0,
+                                          GTK_CSS_AFFECTS_TEXT | GTK_CSS_AFFECTS_TEXT_ATTRS,
+                                          parse_font_variant_caps,
+                                          NULL,
+                                          _gtk_css_ident_value_new ("normal"));
   gtk_css_style_property_register        ("text-shadow",
                                           GTK_CSS_PROPERTY_TEXT_SHADOW,
                                           G_TYPE_NONE,
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index cb340ea..3adb14c 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -166,6 +166,7 @@ enum { /*< skip >*/
   GTK_CSS_PROPERTY_FONT_KERNING,
   GTK_CSS_PROPERTY_FONT_VARIANT_LIGATURES,
   GTK_CSS_PROPERTY_FONT_VARIANT_POSITION,
+  GTK_CSS_PROPERTY_FONT_VARIANT_CAPS,
   GTK_CSS_PROPERTY_TEXT_SHADOW,
   GTK_CSS_PROPERTY_BOX_SHADOW,
   GTK_CSS_PROPERTY_MARGIN_TOP,