+static GtkCssImage *
+gtk_css_image_linear_transition (GtkCssImage *start_image,
+ GtkCssImage *end_image,
+ guint property_id,
+ double progress)
+{
+ GtkCssImageLinear *start, *end, *result;
+ guint i;
+
+ start = GTK_CSS_IMAGE_LINEAR (start_image);
+
+ if (end_image == NULL)
+
+ if (!GTK_IS_CSS_IMAGE_LINEAR (end_image))
+ return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
+
+ end = GTK_CSS_IMAGE_LINEAR (end_image);
+
+ if ((start->repeating != end->repeating)
+ || (start->stops->len != end->stops->len))
+ return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
+
+ result = g_object_new (GTK_TYPE_CSS_IMAGE_LINEAR, NULL);
+ result->repeating = start->repeating;
+
+ result->angle = _gtk_css_value_transition (start->angle, end->angle, property_id, progress);
+ if (result->angle == NULL)
+ goto fail;
+
+ for (i = 0; i < start->stops->len; i++)
+ {
+ GtkCssImageLinearColorStop stop, *start_stop, *end_stop;
+
+ start_stop = &g_array_index (start->stops, GtkCssImageLinearColorStop, i);
+ end_stop = &g_array_index (end->stops, GtkCssImageLinearColorStop, i);
+
+ if ((start_stop->offset != NULL) != (end_stop->offset != NULL))
+ goto fail;
+
+ if (start_stop->offset == NULL)
+ {
+ stop.offset = NULL;
+ }
+ else
+ {
+ stop.offset = _gtk_css_value_transition (start_stop->offset,
+ end_stop->offset,
+ property_id,
+ progress);
+ if (stop.offset == NULL)
+ goto fail;
+ }
+
+ stop.color = _gtk_css_value_transition (start_stop->color,
+ end_stop->color,
+ property_id,
+ progress);
+ if (stop.color == NULL)
+ {
+ if (stop.offset)
+ _gtk_css_value_unref (stop.offset);
+ goto fail;
+ }
+
+ g_array_append_val (result->stops, stop);
+ }
+
+ return GTK_CSS_IMAGE (result);
+
+fail:
+ g_object_unref (result);
+ return GTK_CSS_IMAGE_CLASS (_gtk_css_image_linear_parent_class)->transition (start_image, end_image, property_id, progress);
+}
+
+static gboolean
+gtk_css_image_linear_equal (GtkCssImage *image1,
+ GtkCssImage *image2)
+{
+ GtkCssImageLinear *linear1 = GTK_CSS_IMAGE_LINEAR (image1);
+ GtkCssImageLinear *linear2 = GTK_CSS_IMAGE_LINEAR (image2);
+ guint i;
+
+ if (linear1->repeating != linear2->repeating ||
+ !_gtk_css_value_equal (linear1->angle, linear2->angle) ||
+ linear1->stops->len != linear2->stops->len)
+ return FALSE;
+
+ for (i = 0; i < linear1->stops->len; i++)
+ {
+ GtkCssImageLinearColorStop *stop1, *stop2;
+
+ stop1 = &g_array_index (linear1->stops, GtkCssImageLinearColorStop, i);
+ stop2 = &g_array_index (linear2->stops, GtkCssImageLinearColorStop, i);
+
+ if (!_gtk_css_value_equal0 (stop1->offset, stop2->offset) ||
+ !_gtk_css_value_equal (stop1->color, stop2->color))
+ return FALSE;
+ }
+
+ return TRUE;
+}
+