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