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153cb33eec
Maintain the bounding box of drawables (i.e., the bounds of their actual rendered content) separately from their logical boundary (as shown in the UI). The bounding box is calculated through the new GimpDrawable::get_bounding_box() virtual function, which has a corresponding gimp_drawable_get_bounding_box() function; the default implementation simply returns the drawable's logical boundary. The bounding box is specified in drawable coordinates, i.e., it's not affected by the drawable's offset. The bounding box is recalculated through gimp_drawable_update_bounding_box(), which should be called whenever a change may affect the bounding box (for example, when setting a new buffer, as done implicitly by GimpDrawable's ::set_buffer() implementation, or when a drawable filter's properties change, as will be done by GimpDrawableFilter in a following commit). When the bounding box changes, the affected regions of the drawable are updated, and the GimpDrawable::bounding-box-changed signal is emitted. When gimp_drawable_update() is called with negative width/height values, the entire drawable's bounding box is updated, rather than only its logical boundary. Likewise, GimpDrawableStack and GimpLayerStack are adapted to use the bounding box, instead of the logical bounds, when updating the drawable's area.
243 lines
8 KiB
C
243 lines
8 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 <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 "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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gimp_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_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 = 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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GeglRectangle bounding_box;
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bounding_box = gimp_drawable_get_bounding_box (GIMP_DRAWABLE (item));
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bounding_box.x += gimp_item_get_offset_x (item);
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bounding_box.y += gimp_item_get_offset_y (item);
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gimp_drawable_stack_update (GIMP_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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