[gtk+] css: Add rem unit

[Benjamin Otte <otte src gnome org>]

commit 0e7691c12ec2249b80e6f7d46f5e8f2aeecf345a
Author: Benjamin Otte <otte redhat com>
Date:   Thu Feb 4 19:37:44 2016 +0100

    css: Add rem unit
    
    Good luck, Lapo.

 gtk/gtkcssnumbervalue.c  |    9 ++++-----
 gtk/gtkcssparser.c       |    1 +
 gtk/gtkcsstypesprivate.h |    1 +
 3 files changed, 6 insertions(+), 5 deletions(-)
---
diff --git a/gtk/gtkcssnumbervalue.c b/gtk/gtkcssnumbervalue.c
index 49bd67c..2524d46 100644
--- a/gtk/gtkcssnumbervalue.c
+++ b/gtk/gtkcssnumbervalue.c
@@ -117,29 +117,27 @@ gtk_css_value_number_compute (GtkCssValue             *number,
     case GTK_CSS_PC:
       return _gtk_css_number_value_new (number->value * 96.0 / 72.0 * 12.0,
                                         GTK_CSS_PX);
-      break;
     case GTK_CSS_IN:
       return _gtk_css_number_value_new (number->value * 96.0,
                                         GTK_CSS_PX);
-      break;
     case GTK_CSS_CM:
       return _gtk_css_number_value_new (number->value * 96.0 * 0.39370078740157477,
                                         GTK_CSS_PX);
-      break;
     case GTK_CSS_MM:
       return _gtk_css_number_value_new (number->value * 96.0 * 0.039370078740157477,
                                         GTK_CSS_PX);
-      break;
     case GTK_CSS_EM:
       return _gtk_css_number_value_new (number->value *
                                         get_base_font_size (property_id, provider, style, parent_style),
                                         GTK_CSS_PX);
-      break;
     case GTK_CSS_EX:
       /* for now we pretend ex is half of em */
       return _gtk_css_number_value_new (number->value * 0.5 * 
                                         get_base_font_size (property_id, provider, style, parent_style),
                                         GTK_CSS_PX);
+    case GTK_CSS_REM:
+      return _gtk_css_number_value_new (number->value * _gtk_css_font_size_get_default (provider),
+                                        GTK_CSS_PX);
     case GTK_CSS_RAD:
       return _gtk_css_number_value_new (number->value * 360.0 / (2 * G_PI),
                                         GTK_CSS_DEG);
@@ -191,6 +189,7 @@ gtk_css_value_number_print (const GtkCssValue *number,
     /* [GTK_CSS_PT] = */ "pt",
     /* [GTK_CSS_EM] = */ "em",
     /* [GTK_CSS_EX] = */ "ex",
+    /* [GTK_CSS_REM] = */ "rem",
     /* [GTK_CSS_PC] = */ "pc",
     /* [GTK_CSS_IN] = */ "in",
     /* [GTK_CSS_CM] = */ "cm",
diff --git a/gtk/gtkcssparser.c b/gtk/gtkcssparser.c
index 13d81e1..2c52fb2 100644
--- a/gtk/gtkcssparser.c
+++ b/gtk/gtkcssparser.c
@@ -617,6 +617,7 @@ _gtk_css_number_value_parse (GtkCssParser           *parser,
     { "pt",   GTK_CSS_PT,      GTK_CSS_PARSE_LENGTH },
     { "em",   GTK_CSS_EM,      GTK_CSS_PARSE_LENGTH },
     { "ex",   GTK_CSS_EX,      GTK_CSS_PARSE_LENGTH },
+    { "rem",  GTK_CSS_REM,     GTK_CSS_PARSE_LENGTH },
     { "pc",   GTK_CSS_PC,      GTK_CSS_PARSE_LENGTH },
     { "in",   GTK_CSS_IN,      GTK_CSS_PARSE_LENGTH },
     { "cm",   GTK_CSS_CM,      GTK_CSS_PARSE_LENGTH },
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index b32c05a..dacba66 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -348,6 +348,7 @@ typedef enum /*< skip >*/ {
   GTK_CSS_PT,
   GTK_CSS_EM,
   GTK_CSS_EX,
+  GTK_CSS_REM,
   GTK_CSS_PC,
   GTK_CSS_IN,
   GTK_CSS_CM,