PIKApp/app/core/pikalayer-floating-selection.c

349 lines
11 KiB
C
Raw Permalink Normal View History

2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* 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 "libpikabase/pikabase.h"
#include "core-types.h"
#include "pikaboundary.h"
#include "pikadrawable-filters.h"
#include "pikadrawable-floating-selection.h"
#include "pikaerror.h"
#include "pikaimage.h"
#include "pikaimage-undo.h"
#include "pikaimage-undo-push.h"
#include "pikalayer.h"
#include "pikalayer-floating-selection.h"
#include "pikalayermask.h"
#include "pika-intl.h"
/* public functions */
void
floating_sel_attach (PikaLayer *layer,
PikaDrawable *drawable)
{
PikaImage *image;
PikaLayer *floating_sel;
PikaLayer *parent = NULL;
gint position = 0;
g_return_if_fail (PIKA_IS_LAYER (layer));
g_return_if_fail (PIKA_IS_DRAWABLE (drawable));
g_return_if_fail (pika_item_is_attached (PIKA_ITEM (drawable)));
g_return_if_fail (drawable != PIKA_DRAWABLE (layer));
g_return_if_fail (pika_item_get_image (PIKA_ITEM (layer)) ==
pika_item_get_image (PIKA_ITEM (drawable)));
image = pika_item_get_image (PIKA_ITEM (drawable));
floating_sel = pika_image_get_floating_selection (image);
/* If there is already a floating selection, anchor it */
if (floating_sel)
{
floating_sel_anchor (floating_sel);
/* if we were pasting to the old floating selection, paste now
* to the drawable
*/
if (drawable == (PikaDrawable *) floating_sel)
{
GList *drawables = pika_image_get_selected_drawables (image);
g_return_if_fail (g_list_length (drawables) == 1);
drawable = drawables->data;
g_list_free (drawables);
}
}
pika_layer_set_lock_alpha (layer, TRUE, FALSE);
pika_layer_set_floating_sel_drawable (layer, drawable);
/* Floating selection layer placement, default to the top of the
* layers stack; parent and position are adapted according to the
* drawable associated with the floating selection.
*/
if (PIKA_IS_LAYER_MASK (drawable))
{
PikaLayer *tmp = pika_layer_mask_get_layer (PIKA_LAYER_MASK (drawable));
parent = PIKA_LAYER (pika_item_get_parent (PIKA_ITEM (tmp)));
position = pika_item_get_index (PIKA_ITEM (tmp));
}
else if (PIKA_IS_LAYER (drawable))
{
parent = PIKA_LAYER (pika_item_get_parent (PIKA_ITEM (drawable)));
position = pika_item_get_index (PIKA_ITEM (drawable));
}
pika_image_add_layer (image, layer, parent, position, TRUE);
}
void
floating_sel_anchor (PikaLayer *layer)
{
PikaImage *image;
PikaDrawable *drawable;
PikaFilter *filter = NULL;
GeglRectangle bounding_box;
GeglRectangle dr_bounding_box;
gint off_x, off_y;
gint dr_off_x, dr_off_y;
g_return_if_fail (PIKA_IS_LAYER (layer));
g_return_if_fail (pika_layer_is_floating_sel (layer));
/* Don't let pika_image_remove_layer free the layer while we still need it */
g_object_ref (layer);
image = pika_item_get_image (PIKA_ITEM (layer));
pika_image_undo_group_start (image, PIKA_UNDO_GROUP_FS_ANCHOR,
C_("undo-type", "Anchor Floating Selection"));
drawable = pika_layer_get_floating_sel_drawable (layer);
pika_item_get_offset (PIKA_ITEM (layer), &off_x, &off_y);
pika_item_get_offset (PIKA_ITEM (drawable), &dr_off_x, &dr_off_y);
bounding_box = pika_drawable_get_bounding_box (PIKA_DRAWABLE (layer));
dr_bounding_box = pika_drawable_get_bounding_box (drawable);
bounding_box.x += off_x;
bounding_box.y += off_y;
dr_bounding_box.x += dr_off_x;
dr_bounding_box.y += dr_off_y;
if (pika_item_get_visible (PIKA_ITEM (layer)) &&
gegl_rectangle_intersect (NULL, &bounding_box, &dr_bounding_box))
{
filter = pika_drawable_get_floating_sel_filter (drawable);
}
if (filter)
{
pika_drawable_merge_filter (drawable, filter, NULL, NULL,
NULL, FALSE, FALSE, FALSE);
}
pika_image_remove_layer (image, layer, TRUE, NULL);
pika_image_undo_group_end (image);
/* invalidate the boundaries */
pika_drawable_invalidate_boundary (PIKA_DRAWABLE (pika_image_get_mask (image)));
g_object_unref (layer);
}
gboolean
floating_sel_to_layer (PikaLayer *layer,
GError **error)
{
PikaItem *item;
PikaImage *image;
g_return_val_if_fail (PIKA_IS_LAYER (layer), FALSE);
g_return_val_if_fail (pika_layer_is_floating_sel (layer), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
item = PIKA_ITEM (layer);
image = pika_item_get_image (item);
/* Check if the floating layer belongs to a channel */
if (PIKA_IS_CHANNEL (pika_layer_get_floating_sel_drawable (layer)))
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("Cannot create a new layer from the floating "
"selection because it belongs to a layer mask "
"or channel."));
return FALSE;
}
pika_image_undo_group_start (image, PIKA_UNDO_GROUP_FS_TO_LAYER,
C_("undo-type", "Floating Selection to Layer"));
pika_image_undo_push_fs_to_layer (image, NULL, layer);
pika_drawable_detach_floating_sel (pika_layer_get_floating_sel_drawable (layer));
pika_layer_set_floating_sel_drawable (layer, NULL);
pika_item_set_visible (item, TRUE, TRUE);
pika_layer_set_lock_alpha (layer, FALSE, TRUE);
pika_image_undo_group_end (image);
/* When the floating selection is converted to/from a normal layer
* it does something resembling a name change, so emit the
* "name-changed" signal
*/
pika_object_name_changed (PIKA_OBJECT (layer));
pika_drawable_update (PIKA_DRAWABLE (layer),
0, 0,
pika_item_get_width (item),
pika_item_get_height (item));
return TRUE;
}
void
floating_sel_activate_drawable (PikaLayer *layer)
{
PikaImage *image;
PikaDrawable *drawable;
GList *selected_drawables;
g_return_if_fail (PIKA_IS_LAYER (layer));
g_return_if_fail (pika_layer_is_floating_sel (layer));
image = pika_item_get_image (PIKA_ITEM (layer));
drawable = pika_layer_get_floating_sel_drawable (layer);
/* set the underlying drawable to active */
if (PIKA_IS_LAYER_MASK (drawable))
{
PikaLayerMask *mask = PIKA_LAYER_MASK (drawable);
selected_drawables = g_list_prepend (NULL, pika_layer_mask_get_layer (mask));
pika_image_set_selected_layers (image, selected_drawables);
}
else if (PIKA_IS_CHANNEL (drawable))
{
selected_drawables = g_list_prepend (NULL, drawable);
pika_image_set_selected_channels (image, selected_drawables);
}
else
{
selected_drawables = g_list_prepend (NULL, drawable);
pika_image_set_selected_layers (image, selected_drawables);
}
g_list_free (selected_drawables);
}
const PikaBoundSeg *
floating_sel_boundary (PikaLayer *layer,
gint *n_segs)
{
g_return_val_if_fail (PIKA_IS_LAYER (layer), NULL);
g_return_val_if_fail (pika_layer_is_floating_sel (layer), NULL);
g_return_val_if_fail (n_segs != NULL, NULL);
if (layer->fs.boundary_known == FALSE)
{
gint width, height;
gint off_x, off_y;
width = pika_item_get_width (PIKA_ITEM (layer));
height = pika_item_get_height (PIKA_ITEM (layer));
pika_item_get_offset (PIKA_ITEM (layer), &off_x, &off_y);
if (layer->fs.segs)
g_free (layer->fs.segs);
if (pika_drawable_has_alpha (PIKA_DRAWABLE (layer)))
{
GeglBuffer *buffer;
gint i;
/* find the segments */
buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (layer));
layer->fs.segs = pika_boundary_find (buffer, NULL,
babl_format ("A float"),
PIKA_BOUNDARY_WITHIN_BOUNDS,
0, 0, width, height,
PIKA_BOUNDARY_HALF_WAY,
&layer->fs.num_segs);
/* offset the segments */
for (i = 0; i < layer->fs.num_segs; i++)
{
layer->fs.segs[i].x1 += off_x;
layer->fs.segs[i].y1 += off_y;
layer->fs.segs[i].x2 += off_x;
layer->fs.segs[i].y2 += off_y;
}
}
else
{
layer->fs.num_segs = 4;
layer->fs.segs = g_new0 (PikaBoundSeg, 4);
/* top */
layer->fs.segs[0].x1 = off_x;
layer->fs.segs[0].y1 = off_y;
layer->fs.segs[0].x2 = off_x + width;
layer->fs.segs[0].y2 = off_y;
/* left */
layer->fs.segs[1].x1 = off_x;
layer->fs.segs[1].y1 = off_y;
layer->fs.segs[1].x2 = off_x;
layer->fs.segs[1].y2 = off_y + height;
/* right */
layer->fs.segs[2].x1 = off_x + width;
layer->fs.segs[2].y1 = off_y;
layer->fs.segs[2].x2 = off_x + width;
layer->fs.segs[2].y2 = off_y + height;
/* bottom */
layer->fs.segs[3].x1 = off_x;
layer->fs.segs[3].y1 = off_y + height;
layer->fs.segs[3].x2 = off_x + width;
layer->fs.segs[3].y2 = off_y + height;
}
layer->fs.boundary_known = TRUE;
}
*n_segs = layer->fs.num_segs;
return layer->fs.segs;
}
void
floating_sel_invalidate (PikaLayer *layer)
{
g_return_if_fail (PIKA_IS_LAYER (layer));
g_return_if_fail (pika_layer_is_floating_sel (layer));
/* Invalidate the attached-to drawable's preview */
pika_viewable_invalidate_preview (PIKA_VIEWABLE (pika_layer_get_floating_sel_drawable (layer)));
/* Invalidate the boundary */
layer->fs.boundary_known = FALSE;
}