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gimp/app/core/gimplayer-floating-sel.c

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/* GIMP - The GNU Image Manipulation Program
* 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 <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "core-types.h"
#include "base/boundary.h"
#include "base/pixel-region.h"
#include "gimperror.h"
#include "gimpimage.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimplayer.h"
#include "gimplayer-floating-sel.h"
#include "gimplayermask.h"
#include "gimp-intl.h"
/* local function prototypes */
static void floating_sel_composite (GimpLayer *layer);
/* public functions */
void
floating_sel_attach (GimpLayer *layer,
GimpDrawable *drawable)
{
GimpImage *image;
GimpLayer *floating_sel;
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
g_return_if_fail (drawable != GIMP_DRAWABLE (layer));
g_return_if_fail (gimp_item_get_image (GIMP_ITEM (layer)) ==
gimp_item_get_image (GIMP_ITEM (drawable)));
image = gimp_item_get_image (GIMP_ITEM (drawable));
floating_sel = gimp_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 == (GimpDrawable *) floating_sel)
drawable = gimp_image_get_active_drawable (image);
}
/* set the drawable */
gimp_layer_set_lock_alpha (layer, TRUE, FALSE);
gimp_layer_set_floating_sel_drawable (layer, drawable);
/* add the layer to the image */
gimp_image_add_layer (image, layer, 0, TRUE);
}
void
floating_sel_anchor (GimpLayer *layer)
{
GimpImage *image;
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_layer_is_floating_sel (layer));
image = gimp_item_get_image (GIMP_ITEM (layer));
/* Start a floating selection anchoring undo */
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_ANCHOR,
_("Anchor Floating Selection"));
/* Composite the floating selection contents */
floating_sel_composite (layer);
/* remove the floating selection */
gimp_image_remove_layer (image, layer, TRUE, NULL);
/* end the group undo */
gimp_image_undo_group_end (image);
/* invalidate the boundaries */
gimp_drawable_invalidate_boundary (GIMP_DRAWABLE (gimp_image_get_mask (image)));
}
gboolean
floating_sel_to_layer (GimpLayer *layer,
GError **error)
{
GimpItem *item;
GimpImage *image;
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
g_return_val_if_fail (gimp_layer_is_floating_sel (layer), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
item = GIMP_ITEM (layer);
image = gimp_item_get_image (item);
/* Check if the floating layer belongs to a channel... */
if (GIMP_IS_CHANNEL (gimp_layer_get_floating_sel_drawable (layer)))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Cannot create a new layer from the floating "
"selection because it belongs to a layer mask "
"or channel."));
return FALSE;
}
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_TO_LAYER,
_("Floating Selection to Layer"));
gimp_image_undo_push_fs_to_layer (image, NULL, layer);
gimp_drawable_detach_floating_sel (gimp_layer_get_floating_sel_drawable (layer),
layer);
gimp_layer_set_floating_sel_drawable (layer, NULL);
gimp_item_set_visible (item, TRUE, TRUE);
gimp_layer_set_lock_alpha (layer, FALSE, TRUE);
gimp_image_undo_group_end (image);
gimp_object_name_changed (GIMP_OBJECT (layer));
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
gimp_item_get_width (item),
gimp_item_get_height (item));
return TRUE;
}
void
floating_sel_activate_drawable (GimpLayer *layer)
{
GimpImage *image;
GimpDrawable *drawable;
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_layer_is_floating_sel (layer));
image = gimp_item_get_image (GIMP_ITEM (layer));
drawable = gimp_layer_get_floating_sel_drawable (layer);
/* set the underlying drawable to active */
if (GIMP_IS_LAYER_MASK (drawable))
{
GimpLayerMask *mask = GIMP_LAYER_MASK (drawable);
gimp_image_set_active_layer (image, gimp_layer_mask_get_layer (mask));
}
else if (GIMP_IS_CHANNEL (drawable))
{
gimp_image_set_active_channel (image, GIMP_CHANNEL (drawable));
}
else
{
gimp_image_set_active_layer (image, GIMP_LAYER (drawable));
}
}
const BoundSeg *
floating_sel_boundary (GimpLayer *layer,
gint *n_segs)
{
PixelRegion bPR;
gint i;
g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
g_return_val_if_fail (gimp_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 = gimp_item_get_width (GIMP_ITEM (layer));
height = gimp_item_get_height (GIMP_ITEM (layer));
gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
if (layer->fs.segs)
g_free (layer->fs.segs);
if (gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
{
/* find the segments */
pixel_region_init (&bPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (layer)),
0, 0, width, height, FALSE);
layer->fs.segs = boundary_find (&bPR, BOUNDARY_WITHIN_BOUNDS,
0, 0, width, height,
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 (BoundSeg, 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 (GimpLayer *layer)
{
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_layer_is_floating_sel (layer));
/* Invalidate the attached-to drawable's preview */
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (gimp_layer_get_floating_sel_drawable (layer)));
/* Invalidate the boundary */
layer->fs.boundary_known = FALSE;
}
/* private functions */
static void
floating_sel_composite (GimpLayer *layer)
{
GimpDrawable *drawable;
gint off_x, off_y;
gint dr_off_x, dr_off_y;
gint combine_x, combine_y;
gint combine_width, combine_height;
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_layer_is_floating_sel (layer));
drawable = gimp_layer_get_floating_sel_drawable (layer);
gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
gimp_item_get_offset (GIMP_ITEM (drawable), &dr_off_x, &dr_off_y);
/* First restore what's behind the image if necessary,
* then check for visibility
*/
if (gimp_item_get_visible (GIMP_ITEM (layer)) &&
gimp_rectangle_intersect (off_x, off_y,
gimp_item_get_width (GIMP_ITEM (layer)),
gimp_item_get_height (GIMP_ITEM (layer)),
dr_off_x, dr_off_y,
gimp_item_get_width (GIMP_ITEM (drawable)),
gimp_item_get_height (GIMP_ITEM (drawable)),
&combine_x, &combine_y,
&combine_width, &combine_height))
{
PixelRegion fsPR;
gboolean lock_alpha = FALSE;
/* composite the area from the layer to the drawable */
pixel_region_init (&fsPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (layer)),
combine_x - off_x,
combine_y - off_y,
combine_width, combine_height,
FALSE);
/* a kludge here to prevent the case of the drawable
* underneath having lock alpha on, and disallowing
* the composited floating selection from being shown
*/
if (GIMP_IS_LAYER (drawable))
{
lock_alpha = gimp_layer_get_lock_alpha (GIMP_LAYER (drawable));
if (lock_alpha)
gimp_layer_set_lock_alpha (GIMP_LAYER (drawable), FALSE, FALSE);
}
/* apply the fs with the undo specified by the value
* passed to this function
*/
gimp_drawable_apply_region (drawable, &fsPR,
TRUE, NULL,
gimp_layer_get_opacity (layer),
gimp_layer_get_mode (layer),
NULL, NULL,
combine_x - dr_off_x,
combine_y - dr_off_y);
/* restore lock alpha */
if (lock_alpha)
gimp_layer_set_lock_alpha (GIMP_LAYER (drawable), TRUE, FALSE);
}
}
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