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/* 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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