248 lines
8.3 KiB
C
248 lines
8.3 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995-1997 Spencer Kimball and Peter Mattis
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*
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* pikalayerstack.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 <https://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 "pikalayer.h"
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#include "pikalayerstack.h"
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/* local function prototypes */
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static void pika_layer_stack_constructed (GObject *object);
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static void pika_layer_stack_add (PikaContainer *container,
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PikaObject *object);
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static void pika_layer_stack_remove (PikaContainer *container,
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PikaObject *object);
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static void pika_layer_stack_reorder (PikaContainer *container,
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PikaObject *object,
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gint new_index);
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static void pika_layer_stack_layer_active (PikaLayer *layer,
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PikaLayerStack *stack);
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static void pika_layer_stack_layer_excludes_backdrop (PikaLayer *layer,
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PikaLayerStack *stack);
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static void pika_layer_stack_update_backdrop (PikaLayerStack *stack,
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PikaLayer *layer,
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gboolean ignore_active,
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gboolean ignore_excludes_backdrop);
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static void pika_layer_stack_update_range (PikaLayerStack *stack,
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gint first,
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gint last);
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G_DEFINE_TYPE (PikaLayerStack, pika_layer_stack, PIKA_TYPE_DRAWABLE_STACK)
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#define parent_class pika_layer_stack_parent_class
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static void
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pika_layer_stack_class_init (PikaLayerStackClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaContainerClass *container_class = PIKA_CONTAINER_CLASS (klass);
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object_class->constructed = pika_layer_stack_constructed;
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container_class->add = pika_layer_stack_add;
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container_class->remove = pika_layer_stack_remove;
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container_class->reorder = pika_layer_stack_reorder;
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}
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static void
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pika_layer_stack_init (PikaLayerStack *stack)
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{
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}
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static void
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pika_layer_stack_constructed (GObject *object)
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{
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PikaContainer *container = PIKA_CONTAINER (object);
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G_OBJECT_CLASS (parent_class)->constructed (object);
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pika_assert (g_type_is_a (pika_container_get_children_type (container),
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PIKA_TYPE_LAYER));
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pika_container_add_handler (container, "active-changed",
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G_CALLBACK (pika_layer_stack_layer_active),
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container);
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pika_container_add_handler (container, "excludes-backdrop-changed",
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G_CALLBACK (pika_layer_stack_layer_excludes_backdrop),
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container);
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}
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static void
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pika_layer_stack_add (PikaContainer *container,
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PikaObject *object)
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{
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PikaLayerStack *stack = PIKA_LAYER_STACK (container);
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PIKA_CONTAINER_CLASS (parent_class)->add (container, object);
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pika_layer_stack_update_backdrop (stack, PIKA_LAYER (object), FALSE, FALSE);
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}
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static void
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pika_layer_stack_remove (PikaContainer *container,
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PikaObject *object)
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{
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PikaLayerStack *stack = PIKA_LAYER_STACK (container);
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gboolean update_backdrop;
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gint index;
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update_backdrop = pika_filter_get_active (PIKA_FILTER (object)) &&
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pika_layer_get_excludes_backdrop (PIKA_LAYER (object));
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if (update_backdrop)
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index = pika_container_get_child_index (container, object);
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PIKA_CONTAINER_CLASS (parent_class)->remove (container, object);
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if (update_backdrop)
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pika_layer_stack_update_range (stack, index, -1);
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}
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static void
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pika_layer_stack_reorder (PikaContainer *container,
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PikaObject *object,
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gint new_index)
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{
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PikaLayerStack *stack = PIKA_LAYER_STACK (container);
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gboolean update_backdrop;
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gint index;
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update_backdrop = pika_filter_get_active (PIKA_FILTER (object)) &&
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pika_layer_get_excludes_backdrop (PIKA_LAYER (object));
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if (update_backdrop)
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index = pika_container_get_child_index (container, object);
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PIKA_CONTAINER_CLASS (parent_class)->reorder (container, object, new_index);
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if (update_backdrop)
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pika_layer_stack_update_range (stack, index, new_index);
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}
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/* public functions */
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PikaContainer *
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pika_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, PIKA_TYPE_LAYER), NULL);
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return g_object_new (PIKA_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", PIKA_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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pika_layer_stack_layer_active (PikaLayer *layer,
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PikaLayerStack *stack)
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{
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pika_layer_stack_update_backdrop (stack, layer, TRUE, FALSE);
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}
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static void
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pika_layer_stack_layer_excludes_backdrop (PikaLayer *layer,
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PikaLayerStack *stack)
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{
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pika_layer_stack_update_backdrop (stack, layer, FALSE, TRUE);
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}
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static void
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pika_layer_stack_update_backdrop (PikaLayerStack *stack,
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PikaLayer *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 || pika_filter_get_active (PIKA_FILTER (layer))) &&
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(ignore_excludes_backdrop || pika_layer_get_excludes_backdrop (layer)))
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{
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gint index;
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index = pika_container_get_child_index (PIKA_CONTAINER (stack),
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PIKA_OBJECT (layer));
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pika_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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pika_layer_stack_update_range (PikaLayerStack *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_return_if_fail (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 = pika_item_stack_get_item_iter (PIKA_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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PikaItem *item = iter->data;
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if (pika_filter_get_active (PIKA_FILTER (item)))
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{
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GeglRectangle bounding_box;
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bounding_box = pika_drawable_get_bounding_box (PIKA_DRAWABLE (item));
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bounding_box.x += pika_item_get_offset_x (item);
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bounding_box.y += pika_item_get_offset_y (item);
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pika_drawable_stack_update (PIKA_DRAWABLE_STACK (stack),
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bounding_box.x, bounding_box.y,
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bounding_box.width, bounding_box.height);
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}
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}
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}
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