+static double
+get_base_font_size (guint property_id,
+ GtkStyleProviderPrivate *provider,
+ GtkCssComputedValues *values,
+ GtkCssComputedValues *parent_values,
+ GtkCssDependencies *dependencies)
+{
+ if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
+ {
+ *dependencies = GTK_CSS_DEPENDS_ON_PARENT;
+ if (parent_values)
+ return _gtk_css_number_value_get (_gtk_css_computed_values_get_value (parent_values, GTK_CSS_PROPERTY_FONT_SIZE), 100);
+ else
+ return _gtk_css_font_size_get_default (provider);
+ }
+
+ *dependencies = GTK_CSS_DEPENDS_ON_FONT_SIZE;
+ return _gtk_css_number_value_get (_gtk_css_computed_values_get_value (values, GTK_CSS_PROPERTY_FONT_SIZE), 100);
+}
+
+static GtkCssValue *
+gtk_css_value_number_compute (GtkCssValue *number,
+ guint property_id,
+ GtkStyleProviderPrivate *provider,
+ GtkCssComputedValues *values,
+ GtkCssComputedValues *parent_values,
+ GtkCssDependencies *dependencies)
+{
+ switch (number->unit)
+ {
+ default:
+ g_assert_not_reached();
+ /* fall through */
+ case GTK_CSS_PERCENT:
+ /* percentages for font sizes are computed, other percentages aren't */
+ if (property_id == GTK_CSS_PROPERTY_FONT_SIZE)
+ return _gtk_css_number_value_new (number->value / 100.0 *
+ get_base_font_size (property_id, provider, values, parent_values, dependencies),
+ GTK_CSS_PX);
+ case GTK_CSS_NUMBER:
+ case GTK_CSS_PX:
+ case GTK_CSS_DEG:
+ case GTK_CSS_S:
+ return _gtk_css_value_ref (number);
+ case GTK_CSS_PT:
+ return _gtk_css_number_value_new (number->value * 96.0 / 72.0,
+ GTK_CSS_PX);
+ 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, values, parent_values, dependencies),
+ 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, values, parent_values, dependencies),
+ GTK_CSS_PX);
+ case GTK_CSS_RAD:
+ return _gtk_css_number_value_new (number->value * 360.0 / (2 * G_PI),
+ GTK_CSS_DEG);
+ case GTK_CSS_GRAD:
+ return _gtk_css_number_value_new (number->value * 360.0 / 400.0,
+ GTK_CSS_DEG);
+ case GTK_CSS_TURN:
+ return _gtk_css_number_value_new (number->value * 360.0,
+ GTK_CSS_DEG);
+ case GTK_CSS_MS:
+ return _gtk_css_number_value_new (number->value / 1000.0,
+ GTK_CSS_S);
+ }
+}
+