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-rw-r--r--app/core/gimplayerstack.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/app/core/gimplayerstack.c b/app/core/gimplayerstack.c
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--- /dev/null
+++ b/app/core/gimplayerstack.c
@@ -0,0 +1,243 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
+ *
+ * gimplayerstack.c
+ * Copyright (C) 2017 Ell
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+#include <gegl.h>
+
+#include "core-types.h"
+
+#include "gimplayer.h"
+#include "gimplayerstack.h"
+
+
+/* local function prototypes */
+
+static void gimp_layer_stack_constructed (GObject *object);
+
+static void gimp_layer_stack_add (GimpContainer *container,
+ GimpObject *object);
+static void gimp_layer_stack_remove (GimpContainer *container,
+ GimpObject *object);
+static void gimp_layer_stack_reorder (GimpContainer *container,
+ GimpObject *object,
+ gint new_index);
+
+static void gimp_layer_stack_layer_active (GimpLayer *layer,
+ GimpLayerStack *stack);
+static void gimp_layer_stack_layer_excludes_backdrop (GimpLayer *layer,
+ GimpLayerStack *stack);
+
+static void gimp_layer_stack_update_backdrop (GimpLayerStack *stack,
+ GimpLayer *layer,
+ gboolean ignore_active,
+ gboolean ignore_excludes_backdrop);
+static void gimp_layer_stack_update_range (GimpLayerStack *stack,
+ gint first,
+ gint last);
+
+
+G_DEFINE_TYPE (GimpLayerStack, gimp_layer_stack, GIMP_TYPE_DRAWABLE_STACK)
+
+#define parent_class gimp_layer_stack_parent_class
+
+
+static void
+gimp_layer_stack_class_init (GimpLayerStackClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpContainerClass *container_class = GIMP_CONTAINER_CLASS (klass);
+
+ object_class->constructed = gimp_layer_stack_constructed;
+
+ container_class->add = gimp_layer_stack_add;
+ container_class->remove = gimp_layer_stack_remove;
+ container_class->reorder = gimp_layer_stack_reorder;
+}
+
+static void
+gimp_layer_stack_init (GimpLayerStack *stack)
+{
+}
+
+static void
+gimp_layer_stack_constructed (GObject *object)
+{
+ GimpContainer *container = GIMP_CONTAINER (object);
+
+ G_OBJECT_CLASS (parent_class)->constructed (object);
+
+ gimp_assert (g_type_is_a (gimp_container_get_children_type (container),
+ GIMP_TYPE_LAYER));
+
+ gimp_container_add_handler (container, "active-changed",
+ G_CALLBACK (gimp_layer_stack_layer_active),
+ container);
+ gimp_container_add_handler (container, "excludes-backdrop-changed",
+ G_CALLBACK (gimp_layer_stack_layer_excludes_backdrop),
+ container);
+}
+
+static void
+gimp_layer_stack_add (GimpContainer *container,
+ GimpObject *object)
+{
+ GimpLayerStack *stack = GIMP_LAYER_STACK (container);
+
+ GIMP_CONTAINER_CLASS (parent_class)->add (container, object);
+
+ gimp_layer_stack_update_backdrop (stack, GIMP_LAYER (object), FALSE, FALSE);
+}
+
+static void
+gimp_layer_stack_remove (GimpContainer *container,
+ GimpObject *object)
+{
+ GimpLayerStack *stack = GIMP_LAYER_STACK (container);
+ gboolean update_backdrop;
+ gint index;
+
+ update_backdrop = gimp_filter_get_active (GIMP_FILTER (object)) &&
+ gimp_layer_get_excludes_backdrop (GIMP_LAYER (object));
+
+ if (update_backdrop)
+ index = gimp_container_get_child_index (container, object);
+
+ GIMP_CONTAINER_CLASS (parent_class)->remove (container, object);
+
+ if (update_backdrop)
+ gimp_layer_stack_update_range (stack, index, -1);
+}
+
+static void
+gimp_layer_stack_reorder (GimpContainer *container,
+ GimpObject *object,
+ gint new_index)
+{
+ GimpLayerStack *stack = GIMP_LAYER_STACK (container);
+ gboolean update_backdrop;
+ gint index;
+
+ update_backdrop = gimp_filter_get_active (GIMP_FILTER (object)) &&
+ gimp_layer_get_excludes_backdrop (GIMP_LAYER (object));
+
+ if (update_backdrop)
+ index = gimp_container_get_child_index (container, object);
+
+ GIMP_CONTAINER_CLASS (parent_class)->reorder (container, object, new_index);
+
+ if (update_backdrop)
+ gimp_layer_stack_update_range (stack, index, new_index);
+}
+
+
+/* public functions */
+
+GimpContainer *
+gimp_layer_stack_new (GType layer_type)
+{
+ g_return_val_if_fail (g_type_is_a (layer_type, GIMP_TYPE_LAYER), NULL);
+
+ return g_object_new (GIMP_TYPE_LAYER_STACK,
+ "name", g_type_name (layer_type),
+ "children-type", layer_type,
+ "policy", GIMP_CONTAINER_POLICY_STRONG,
+ NULL);
+}
+
+
+/* private functions */
+
+static void
+gimp_layer_stack_layer_active (GimpLayer *layer,
+ GimpLayerStack *stack)
+{
+ gimp_layer_stack_update_backdrop (stack, layer, TRUE, FALSE);
+}
+
+static void
+gimp_layer_stack_layer_excludes_backdrop (GimpLayer *layer,
+ GimpLayerStack *stack)
+{
+ gimp_layer_stack_update_backdrop (stack, layer, FALSE, TRUE);
+}
+
+static void
+gimp_layer_stack_update_backdrop (GimpLayerStack *stack,
+ GimpLayer *layer,
+ gboolean ignore_active,
+ gboolean ignore_excludes_backdrop)
+{
+ if ((ignore_active || gimp_filter_get_active (GIMP_FILTER (layer))) &&
+ (ignore_excludes_backdrop || gimp_layer_get_excludes_backdrop (layer)))
+ {
+ gint index;
+
+ index = gimp_container_get_child_index (GIMP_CONTAINER (stack),
+ GIMP_OBJECT (layer));
+
+ gimp_layer_stack_update_range (stack, index + 1, -1);
+ }
+}
+
+static void
+gimp_layer_stack_update_range (GimpLayerStack *stack,
+ gint first,
+ gint last)
+{
+ GList *iter;
+
+ g_return_if_fail (first >= 0 && last >= -1);
+
+ /* if the range is reversed, flip first and last; note that last == -1 is
+ * used to update all layers from first onward.
+ */
+ if (last >= 0 && last < first)
+ {
+ gint temp = first;
+
+ first = last + 1;
+ last = temp + 1;
+ }
+
+ iter = gimp_item_stack_get_item_iter (GIMP_ITEM_STACK (stack));
+
+ for (iter = g_list_nth (iter, first);
+ iter && first != last;
+ iter = g_list_next (iter), first++)
+ {
+ GimpItem *item = iter->data;
+
+ if (gimp_filter_get_active (GIMP_FILTER (item)))
+ {
+ GeglRectangle bounding_box;
+
+ bounding_box = gimp_drawable_get_bounding_box (GIMP_DRAWABLE (item));
+
+ bounding_box.x += gimp_item_get_offset_x (item);
+ bounding_box.y += gimp_item_get_offset_y (item);
+
+ gimp_drawable_stack_update (GIMP_DRAWABLE_STACK (stack),
+ bounding_box.x, bounding_box.y,
+ bounding_box.width, bounding_box.height);
+ }
+ }
+}
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