css: Add a GtkCssValue for GtkCssImageEffect

This will allow us to use the CSS machinery to apply a highlight or dim
effect when images are prelit or insensitive.

https://bugzilla.gnome.org/show_bug.cgi?id=705443

4 files changed, 84 insertions, 0 deletions

diff --git a/gtk/gtkcssenumvalue.c b/gtk/gtkcssenumvalue.c
index 547edb8ea0..8151d58de2 100644
--- a/gtk/gtkcssenumvalue.c
+++ b/gtk/gtkcssenumvalue.c
@@ -653,3 +653,56 @@ _gtk_css_fill_mode_value_get (const GtkCssValue *value)
   return value->value;
 }
 
+/* GtkCssImageEffect */
+
+static const GtkCssValueClass GTK_CSS_VALUE_IMAGE_EFFECT = {
+  gtk_css_value_enum_free,
+  gtk_css_value_enum_compute,
+  gtk_css_value_enum_equal,
+  gtk_css_value_enum_transition,
+  gtk_css_value_enum_print
+};
+
+static GtkCssValue image_effect_values[] = {
+  { &GTK_CSS_VALUE_IMAGE_EFFECT, 1, GTK_CSS_IMAGE_EFFECT_NONE, "none" },
+  { &GTK_CSS_VALUE_IMAGE_EFFECT, 1, GTK_CSS_IMAGE_EFFECT_HIGHLIGHT, "highlight" },
+  { &GTK_CSS_VALUE_IMAGE_EFFECT, 1, GTK_CSS_IMAGE_EFFECT_DIM, "dim" }
+};
+
+GtkCssValue *
+_gtk_css_image_effect_value_new (GtkCssImageEffect image_effect)
+{
+  guint i;
+
+  for (i = 0; i < G_N_ELEMENTS (image_effect_values); i++)
+    {
+      if (image_effect_values[i].value == image_effect)
+        return _gtk_css_value_ref (&image_effect_values[i]);
+    }
+
+  g_return_val_if_reached (NULL);
+}
+
+GtkCssValue *
+_gtk_css_image_effect_value_try_parse (GtkCssParser *parser)
+{
+  guint i;
+
+  g_return_val_if_fail (parser != NULL, NULL);
+
+  for (i = 0; i < G_N_ELEMENTS (image_effect_values); i++)
+    {
+      if (_gtk_css_parser_try (parser, image_effect_values[i].name, TRUE))
+        return _gtk_css_value_ref (&image_effect_values[i]);
+    }
+
+  return NULL;
+}
+
+GtkCssImageEffect
+_gtk_css_image_effect_value_get (const GtkCssValue *value)
+{
+  g_return_val_if_fail (value->class == &GTK_CSS_VALUE_IMAGE_EFFECT, GTK_CSS_IMAGE_EFFECT_NONE);
+
+  return value->value;
+}
diff --git a/gtk/gtkcssenumvalueprivate.h b/gtk/gtkcssenumvalueprivate.h
index b981008d53..c21df476b7 100644
--- a/gtk/gtkcssenumvalueprivate.h
+++ b/gtk/gtkcssenumvalueprivate.h
@@ -64,6 +64,10 @@ GtkCssValue *   _gtk_css_fill_mode_value_new          (GtkCssFillMode     fill_m
 GtkCssValue *   _gtk_css_fill_mode_value_try_parse    (GtkCssParser      *parser);
 GtkCssFillMode  _gtk_css_fill_mode_value_get          (const GtkCssValue *value);
 
+GtkCssValue *     _gtk_css_image_effect_value_new       (GtkCssImageEffect  image_effect);
+GtkCssValue *     _gtk_css_image_effect_value_try_parse (GtkCssParser      *parser);
+GtkCssImageEffect _gtk_css_image_effect_value_get       (const GtkCssValue *value);
+
 G_END_DECLS
 
 #endif /* __GTK_CSS_ENUM_VALUE_PRIVATE_H__ */
diff --git a/gtk/gtkcssstylepropertyimpl.c b/gtk/gtkcssstylepropertyimpl.c
index c189ea691c..3ff3d76692 100644
--- a/gtk/gtkcssstylepropertyimpl.c
+++ b/gtk/gtkcssstylepropertyimpl.c
@@ -465,6 +465,18 @@ parse_css_fill_mode (GtkCssStyleProperty *property,
 }
 
 static GtkCssValue *
+image_effect_parse (GtkCssStyleProperty *property,
+		    GtkCssParser        *parser)
+{
+  GtkCssValue *value = _gtk_css_image_effect_value_try_parse (parser);
+
+  if (value == NULL)
+    _gtk_css_parser_error (parser, "unknown value for property");
+
+  return value;
+}
+
+static GtkCssValue *
 bindings_value_parse_one (GtkCssParser *parser)
 {
   char *name;
@@ -1398,6 +1410,14 @@ _gtk_css_style_property_init_properties (void)
                                           NULL,
                                           NULL,
                                           _gtk_css_number_value_new (1, GTK_CSS_NUMBER));
+  gtk_css_style_property_register        ("-gtk-image-effect",
+					  GTK_CSS_PROPERTY_GTK_IMAGE_EFFECT,
+					  G_TYPE_NONE,
+					  GTK_STYLE_PROPERTY_INHERIT | GTK_STYLE_PROPERTY_NO_RESIZE,
+					  image_effect_parse,
+					  NULL,
+					  NULL,
+					  _gtk_css_image_effect_value_new (GTK_CSS_IMAGE_EFFECT_NONE));
 
   gtk_css_style_property_register        ("engine",
                                           GTK_CSS_PROPERTY_ENGINE,
diff --git a/gtk/gtkcsstypesprivate.h b/gtk/gtkcsstypesprivate.h
index b2881feaea..72511d9654 100644
--- a/gtk/gtkcsstypesprivate.h
+++ b/gtk/gtkcsstypesprivate.h
@@ -133,6 +133,7 @@ enum { /*< skip >*/
   GTK_CSS_PROPERTY_ANIMATION_DELAY,
   GTK_CSS_PROPERTY_ANIMATION_FILL_MODE,
   GTK_CSS_PROPERTY_OPACITY,
+  GTK_CSS_PROPERTY_GTK_IMAGE_EFFECT,
   GTK_CSS_PROPERTY_ENGINE,
   GTK_CSS_PROPERTY_GTK_KEY_BINDINGS,
   /* add more */
@@ -165,6 +166,12 @@ typedef enum /*< skip >*/ {
 } GtkCssFillMode;
 
 typedef enum /*< skip >*/ {
+  GTK_CSS_IMAGE_EFFECT_NONE,
+  GTK_CSS_IMAGE_EFFECT_HIGHLIGHT,
+  GTK_CSS_IMAGE_EFFECT_DIM
+} GtkCssImageEffect;
+
+typedef enum /*< skip >*/ {
   /* relative font sizes */
   GTK_CSS_FONT_SIZE_SMALLER,
   GTK_CSS_FONT_SIZE_LARGER,