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gimp/app/core/gimpselection.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 <string.h>
#include <gegl.h>
#include "core-types.h"
#include "paint-funcs/paint-funcs.h"
#include "base/pixel-region.h"
#include "base/tile.h"
#include "base/tile-manager.h"
#include "gimp.h"
#include "gimpcontext.h"
#include "gimpdrawable-private.h"
#include "gimperror.h"
#include "gimpimage.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimplayer.h"
#include "gimplayermask.h"
#include "gimplayer-floating-sel.h"
#include "gimppickable.h"
#include "gimpselection.h"
#include "gimp-intl.h"
static gboolean gimp_selection_is_attached (const GimpItem *item);
static GimpItemTree * gimp_selection_get_tree (GimpItem *item);
static void gimp_selection_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo);
static void gimp_selection_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interp_type,
GimpProgress *progress);
static void gimp_selection_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
static void gimp_selection_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result);
static void gimp_selection_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotation_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result);
static gboolean gimp_selection_stroke (GimpItem *item,
GimpDrawable *drawable,
GimpStrokeOptions *stroke_options,
gboolean push_undo,
GimpProgress *progress,
GError **error);
static void gimp_selection_invalidate_boundary (GimpDrawable *drawable);
static gboolean gimp_selection_boundary (GimpChannel *channel,
const BoundSeg **segs_in,
const BoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out,
gint x1,
gint y1,
gint x2,
gint y2);
static gboolean gimp_selection_bounds (GimpChannel *channel,
gint *x1,
gint *y1,
gint *x2,
gint *y2);
static gboolean gimp_selection_is_empty (GimpChannel *channel);
static void gimp_selection_feather (GimpChannel *channel,
gdouble radius_x,
gdouble radius_y,
gboolean push_undo);
static void gimp_selection_sharpen (GimpChannel *channel,
gboolean push_undo);
static void gimp_selection_clear (GimpChannel *channel,
const gchar *undo_desc,
gboolean push_undo);
static void gimp_selection_all (GimpChannel *channel,
gboolean push_undo);
static void gimp_selection_invert (GimpChannel *channel,
gboolean push_undo);
static void gimp_selection_border (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean feather,
gboolean edge_lock,
gboolean push_undo);
static void gimp_selection_grow (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean push_undo);
static void gimp_selection_shrink (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean edge_lock,
gboolean push_undo);
G_DEFINE_TYPE (GimpSelection, gimp_selection, GIMP_TYPE_CHANNEL)
#define parent_class gimp_selection_parent_class
static void
gimp_selection_class_init (GimpSelectionClass *klass)
{
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpItemClass *item_class = GIMP_ITEM_CLASS (klass);
GimpDrawableClass *drawable_class = GIMP_DRAWABLE_CLASS (klass);
GimpChannelClass *channel_class = GIMP_CHANNEL_CLASS (klass);
viewable_class->default_stock_id = "gimp-selection";
item_class->is_attached = gimp_selection_is_attached;
item_class->get_tree = gimp_selection_get_tree;
item_class->translate = gimp_selection_translate;
item_class->scale = gimp_selection_scale;
item_class->resize = gimp_selection_resize;
item_class->flip = gimp_selection_flip;
item_class->rotate = gimp_selection_rotate;
item_class->stroke = gimp_selection_stroke;
item_class->default_name = _("Selection Mask");
item_class->translate_desc = C_("undo-type", "Move Selection");
item_class->stroke_desc = C_("undo-type", "Stroke Selection");
drawable_class->invalidate_boundary = gimp_selection_invalidate_boundary;
channel_class->boundary = gimp_selection_boundary;
channel_class->bounds = gimp_selection_bounds;
channel_class->is_empty = gimp_selection_is_empty;
channel_class->feather = gimp_selection_feather;
channel_class->sharpen = gimp_selection_sharpen;
channel_class->clear = gimp_selection_clear;
channel_class->all = gimp_selection_all;
channel_class->invert = gimp_selection_invert;
channel_class->border = gimp_selection_border;
channel_class->grow = gimp_selection_grow;
channel_class->shrink = gimp_selection_shrink;
channel_class->feather_desc = C_("undo-type", "Feather Selection");
channel_class->sharpen_desc = C_("undo-type", "Sharpen Selection");
channel_class->clear_desc = C_("undo-type", "Select None");
channel_class->all_desc = C_("undo-type", "Select All");
channel_class->invert_desc = C_("undo-type", "Invert Selection");
channel_class->border_desc = C_("undo-type", "Border Selection");
channel_class->grow_desc = C_("undo-type", "Grow Selection");
channel_class->shrink_desc = C_("undo-type", "Shrink Selection");
}
static void
gimp_selection_init (GimpSelection *selection)
{
selection->stroking_count = 0;
}
static gboolean
gimp_selection_is_attached (const GimpItem *item)
{
return (GIMP_IS_IMAGE (gimp_item_get_image (item)) &&
gimp_image_get_mask (gimp_item_get_image (item)) ==
GIMP_CHANNEL (item));
}
static GimpItemTree *
gimp_selection_get_tree (GimpItem *item)
{
return NULL;
}
static void
gimp_selection_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
GIMP_ITEM_CLASS (parent_class)->translate (item, offset_x, offset_y,
push_undo);
}
static void
gimp_selection_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interp_type,
GimpProgress *progress)
{
GIMP_ITEM_CLASS (parent_class)->scale (item, new_width, new_height,
new_offset_x, new_offset_y,
interp_type, progress);
gimp_item_set_offset (item, 0, 0);
}
static void
gimp_selection_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
GIMP_ITEM_CLASS (parent_class)->resize (item, context, new_width, new_height,
offset_x, offset_y);
gimp_item_set_offset (item, 0, 0);
}
static void
gimp_selection_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GIMP_ITEM_CLASS (parent_class)->flip (item, context, flip_type, axis, TRUE);
}
static void
gimp_selection_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotation_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GIMP_ITEM_CLASS (parent_class)->rotate (item, context, rotation_type,
center_x, center_y,
clip_result);
}
static gboolean
gimp_selection_stroke (GimpItem *item,
GimpDrawable *drawable,
GimpStrokeOptions *stroke_options,
gboolean push_undo,
GimpProgress *progress,
GError **error)
{
GimpSelection *selection = GIMP_SELECTION (item);
const BoundSeg *dummy_in;
const BoundSeg *dummy_out;
gint num_dummy_in;
gint num_dummy_out;
gboolean retval;
if (! gimp_channel_boundary (GIMP_CHANNEL (selection),
&dummy_in, &dummy_out,
&num_dummy_in, &num_dummy_out,
0, 0, 0, 0))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("There is no selection to stroke."));
return FALSE;
}
gimp_selection_push_stroking (selection);
retval = GIMP_ITEM_CLASS (parent_class)->stroke (item, drawable,
stroke_options,
push_undo, progress, error);
gimp_selection_pop_stroking (selection);
return retval;
}
static void
gimp_selection_invalidate_boundary (GimpDrawable *drawable)
{
GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
GimpLayer *layer;
/* Turn the current selection off */
gimp_image_selection_invalidate (image);
GIMP_DRAWABLE_CLASS (parent_class)->invalidate_boundary (drawable);
/* If there is a floating selection, update it's area...
* we need to do this since this selection mask can act as an additional
* mask in the composition of the floating selection
*/
layer = gimp_image_get_active_layer (image);
if (layer && gimp_layer_is_floating_sel (layer))
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
gimp_item_get_width (GIMP_ITEM (layer)),
gimp_item_get_height (GIMP_ITEM (layer)));
/* invalidate the preview */
drawable->private->preview_valid = FALSE;
}
static gboolean
gimp_selection_boundary (GimpChannel *channel,
const BoundSeg **segs_in,
const BoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out,
gint unused1,
gint unused2,
gint unused3,
gint unused4)
{
GimpImage *image = gimp_item_get_image (GIMP_ITEM (channel));
GimpDrawable *drawable;
GimpLayer *layer;
if ((layer = gimp_image_get_floating_selection (image)))
{
/* If there is a floating selection, then
* we need to do some slightly different boundaries.
* Instead of inside and outside boundaries being defined
* by the extents of the layer, the inside boundary (the one
* that actually marches and is black/white) is the boundary of
* the floating selection. The outside boundary (doesn't move,
* is black/gray) is defined as the normal selection mask
*/
/* Find the selection mask boundary */
GIMP_CHANNEL_CLASS (parent_class)->boundary (channel,
segs_in, segs_out,
num_segs_in, num_segs_out,
0, 0, 0, 0);
/* Find the floating selection boundary */
*segs_in = floating_sel_boundary (layer, num_segs_in);
return TRUE;
}
else if ((drawable = gimp_image_get_active_drawable (image)) &&
GIMP_IS_CHANNEL (drawable))
{
/* Otherwise, return the boundary...if a channel is active */
return GIMP_CHANNEL_CLASS (parent_class)->boundary (channel,
segs_in, segs_out,
num_segs_in,
num_segs_out,
0, 0,
gimp_image_get_width (image),
gimp_image_get_height (image));
}
else if ((layer = gimp_image_get_active_layer (image)))
{
/* If a layer is active, we return multiple boundaries based
* on the extents
*/
gint x1, y1;
gint x2, y2;
gint offset_x;
gint offset_y;
gimp_item_get_offset (GIMP_ITEM (layer), &offset_x, &offset_y);
x1 = CLAMP (offset_x, 0, gimp_image_get_width (image));
y1 = CLAMP (offset_y, 0, gimp_image_get_height (image));
x2 = CLAMP (offset_x + gimp_item_get_width (GIMP_ITEM (layer)),
0, gimp_image_get_width (image));
y2 = CLAMP (offset_y + gimp_item_get_height (GIMP_ITEM (layer)),
0, gimp_image_get_height (image));
return GIMP_CHANNEL_CLASS (parent_class)->boundary (channel,
segs_in, segs_out,
num_segs_in,
num_segs_out,
x1, y1, x2, y2);
}
*segs_in = NULL;
*segs_out = NULL;
*num_segs_in = 0;
*num_segs_out = 0;
return FALSE;
}
static gboolean
gimp_selection_bounds (GimpChannel *channel,
gint *x1,
gint *y1,
gint *x2,
gint *y2)
{
return GIMP_CHANNEL_CLASS (parent_class)->bounds (channel, x1, y1, x2, y2);
}
static gboolean
gimp_selection_is_empty (GimpChannel *channel)
{
GimpSelection *selection = GIMP_SELECTION (channel);
/* in order to allow stroking of selections, we need to pretend here
* that the selection mask is empty so that it doesn't mask the paint
* during the stroke operation.
*/
if (selection->stroking_count > 0)
return TRUE;
return GIMP_CHANNEL_CLASS (parent_class)->is_empty (channel);
}
static void
gimp_selection_feather (GimpChannel *channel,
gdouble radius_x,
gdouble radius_y,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->feather (channel, radius_x, radius_y,
push_undo);
}
static void
gimp_selection_sharpen (GimpChannel *channel,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->sharpen (channel, push_undo);
}
static void
gimp_selection_clear (GimpChannel *channel,
const gchar *undo_desc,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->clear (channel, undo_desc, push_undo);
}
static void
gimp_selection_all (GimpChannel *channel,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->all (channel, push_undo);
}
static void
gimp_selection_invert (GimpChannel *channel,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->invert (channel, push_undo);
}
static void
gimp_selection_border (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean feather,
gboolean edge_lock,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->border (channel,
radius_x, radius_y,
feather, edge_lock,
push_undo);
}
static void
gimp_selection_grow (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->grow (channel,
radius_x, radius_y,
push_undo);
}
static void
gimp_selection_shrink (GimpChannel *channel,
gint radius_x,
gint radius_y,
gboolean edge_lock,
gboolean push_undo)
{
GIMP_CHANNEL_CLASS (parent_class)->shrink (channel,
radius_x, radius_y, edge_lock,
push_undo);
}
/* public functions */
GimpChannel *
gimp_selection_new (GimpImage *image,
gint width,
gint height)
{
GimpRGB black = { 0.0, 0.0, 0.0, 0.5 };
GimpChannel *channel;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (width > 0 && height > 0, NULL);
channel = GIMP_CHANNEL (gimp_drawable_new (GIMP_TYPE_SELECTION,
image, NULL,
0, 0, width, height,
GIMP_GRAY_IMAGE));
gimp_channel_set_color (channel, &black, FALSE);
gimp_channel_set_show_masked (channel, TRUE);
channel->x2 = width;
channel->y2 = height;
return channel;
}
gint
gimp_selection_push_stroking (GimpSelection *selection)
{
g_return_val_if_fail (GIMP_IS_SELECTION (selection), 0);
selection->stroking_count++;
return selection->stroking_count;
}
gint
gimp_selection_pop_stroking (GimpSelection *selection)
{
g_return_val_if_fail (GIMP_IS_SELECTION (selection), 0);
g_return_val_if_fail (selection->stroking_count > 0, 0);
selection->stroking_count--;
return selection->stroking_count;
}
void
gimp_selection_load (GimpSelection *selection,
GimpChannel *channel)
{
PixelRegion srcPR;
PixelRegion destPR;
gint width;
gint height;
g_return_if_fail (GIMP_IS_SELECTION (selection));
g_return_if_fail (GIMP_IS_CHANNEL (channel));
width = gimp_item_get_width (GIMP_ITEM (selection));
height = gimp_item_get_height (GIMP_ITEM (selection));
g_return_if_fail (width == gimp_item_get_width (GIMP_ITEM (channel)));
g_return_if_fail (height == gimp_item_get_height (GIMP_ITEM (channel)));
gimp_channel_push_undo (GIMP_CHANNEL (selection),
C_("undo-type", "Channel to Selection"));
/* copy the channel to the mask */
pixel_region_init (&srcPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (channel)),
0, 0, width, height,
FALSE);
pixel_region_init (&destPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (selection)),
0, 0, width, height,
TRUE);
copy_region (&srcPR, &destPR);
GIMP_CHANNEL (selection)->bounds_known = FALSE;
gimp_drawable_update (GIMP_DRAWABLE (selection),
0, 0, width, height);
}
GimpChannel *
gimp_selection_save (GimpSelection *selection)
{
GimpImage *image;
GimpChannel *new_channel;
g_return_val_if_fail (GIMP_IS_SELECTION (selection), NULL);
image = gimp_item_get_image (GIMP_ITEM (selection));
new_channel = GIMP_CHANNEL (gimp_item_duplicate (GIMP_ITEM (selection),
GIMP_TYPE_CHANNEL));
/* saved selections are not visible by default */
gimp_item_set_visible (GIMP_ITEM (new_channel), FALSE, FALSE);
gimp_image_add_channel (image, new_channel,
GIMP_IMAGE_ACTIVE_PARENT, -1, TRUE);
return new_channel;
}
TileManager *
gimp_selection_extract (GimpSelection *selection,
GimpPickable *pickable,
GimpContext *context,
gboolean cut_image,
gboolean keep_indexed,
gboolean add_alpha,
gint *offset_x,
gint *offset_y,
GError **error)
{
GimpImage *image;
TileManager *tiles;
PixelRegion srcPR, destPR;
guchar bg_color[MAX_CHANNELS];
const guchar *colormap;
GimpImageBaseType base_type = GIMP_RGB;
gint bytes = 0;
gint x1, y1, x2, y2;
gboolean non_empty;
gint off_x, off_y;
g_return_val_if_fail (GIMP_IS_SELECTION (selection), NULL);
g_return_val_if_fail (GIMP_IS_PICKABLE (pickable), NULL);
if (GIMP_IS_ITEM (pickable))
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (pickable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
image = gimp_pickable_get_image (pickable);
/* If there are no bounds, then just extract the entire image
* This may not be the correct behavior, but after getting rid
* of floating selections, it's still tempting to "cut" or "copy"
* a small layer and expect it to work, even though there is no
* actual selection mask
*/
if (GIMP_IS_DRAWABLE (pickable))
non_empty = gimp_item_mask_bounds (GIMP_ITEM (pickable),
&x1, &y1, &x2, &y2);
else
non_empty = gimp_channel_bounds (GIMP_CHANNEL (selection),
&x1, &y1, &x2, &y2);
if (non_empty && ((x1 == x2) || (y1 == y2)))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Unable to cut or copy because the "
"selected region is empty."));
return NULL;
}
/* If there is a selection, we must add alpha because the selection
* could have any shape.
*/
if (non_empty)
add_alpha = TRUE;
/* How many bytes in the temp buffer? */
switch (GIMP_IMAGE_TYPE_BASE_TYPE (gimp_pickable_get_image_type (pickable)))
{
case GIMP_RGB:
bytes = add_alpha ? 4 : gimp_pickable_get_bytes (pickable);
base_type = GIMP_RGB;
break;
case GIMP_GRAY:
bytes = add_alpha ? 2 : gimp_pickable_get_bytes (pickable);
base_type = GIMP_GRAY;
break;
case GIMP_INDEXED:
if (keep_indexed)
{
bytes = add_alpha ? 2 : gimp_pickable_get_bytes (pickable);
base_type = GIMP_GRAY;
}
else
{
bytes = (add_alpha ||
GIMP_IMAGE_TYPE_HAS_ALPHA (gimp_pickable_get_image_type (pickable))) ? 4 : 3;
base_type = GIMP_INDEXED;
}
break;
default:
g_assert_not_reached ();
break;
}
gimp_image_get_background (image, context,
gimp_pickable_get_image_type (pickable),
bg_color);
/* If a cut was specified, and the selection mask is not empty,
* push an undo
*/
if (GIMP_IS_DRAWABLE (pickable))
{
if (cut_image && non_empty)
gimp_drawable_push_undo (GIMP_DRAWABLE (pickable), NULL,
x1, y1,
x2 - x1, y2 - y1,
NULL, FALSE);
gimp_item_get_offset (GIMP_ITEM (pickable), &off_x, &off_y);
colormap = gimp_drawable_get_colormap (GIMP_DRAWABLE (pickable));
}
else
{
off_x = off_y = 0;
colormap = NULL;
}
gimp_pickable_flush (pickable);
/* Allocate the temp buffer */
tiles = tile_manager_new (x2 - x1, y2 - y1, bytes);
/* configure the pixel regions */
pixel_region_init (&srcPR, gimp_pickable_get_tiles (pickable),
x1, y1,
x2 - x1, y2 - y1,
cut_image);
pixel_region_init (&destPR, tiles,
0, 0,
x2 - x1, y2 - y1,
TRUE);
if (non_empty) /* If there is a selection, extract from it */
{
PixelRegion maskPR;
pixel_region_init (&maskPR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (selection)),
(x1 + off_x), (y1 + off_y), (x2 - x1), (y2 - y1),
FALSE);
extract_from_region (&srcPR, &destPR, &maskPR,
colormap, bg_color, base_type, cut_image);
if (GIMP_IS_DRAWABLE (pickable) && cut_image)
{
/* Update the region */
gimp_drawable_update (GIMP_DRAWABLE (pickable),
x1, y1, (x2 - x1), (y2 - y1));
}
}
else /* Otherwise, get the entire active layer */
{
if (base_type == GIMP_INDEXED && !keep_indexed)
{
/* If the layer is indexed...we need to extract pixels */
extract_from_region (&srcPR, &destPR, NULL,
colormap, bg_color, base_type, FALSE);
}
else if (bytes > srcPR.bytes)
{
/* If the layer doesn't have an alpha channel, add one */
add_alpha_region (&srcPR, &destPR);
}
else
{
/* Otherwise, do a straight copy */
copy_region (&srcPR, &destPR);
}
/* If we're cutting, remove either the layer (or floating selection),
* the layer mask, or the channel
*/
if (GIMP_IS_DRAWABLE (pickable) && cut_image)
{
if (GIMP_IS_LAYER (pickable))
{
gimp_image_remove_layer (image, GIMP_LAYER (pickable),
TRUE, NULL);
}
else if (GIMP_IS_LAYER_MASK (pickable))
{
gimp_layer_apply_mask (gimp_layer_mask_get_layer (GIMP_LAYER_MASK (pickable)),
GIMP_MASK_DISCARD, TRUE);
}
else if (GIMP_IS_CHANNEL (pickable))
{
gimp_image_remove_channel (image, GIMP_CHANNEL (pickable),
TRUE, NULL);
}
}
}
*offset_x = x1 + off_x;
*offset_y = y1 + off_y;
return tiles;
}
GimpLayer *
gimp_selection_float (GimpSelection *selection,
GimpDrawable *drawable,
GimpContext *context,
gboolean cut_image,
gint off_x,
gint off_y,
GError **error)
{
GimpImage *image;
GimpLayer *layer;
TileManager *tiles;
gint x1, y1;
gint x2, y2;
g_return_val_if_fail (GIMP_IS_SELECTION (selection), NULL);
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
image = gimp_item_get_image (GIMP_ITEM (selection));
/* Make sure there is a region to float... */
if (! gimp_item_mask_bounds (GIMP_ITEM (drawable), &x1, &y1, &x2, &y2) ||
(x1 == x2 || y1 == y2))
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Cannot float selection because the selected "
"region is empty."));
return NULL;
}
/* Start an undo group */
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_FS_FLOAT,
C_("undo-type", "Float Selection"));
/* Cut or copy the selected region */
tiles = gimp_selection_extract (selection, GIMP_PICKABLE (drawable), context,
cut_image, FALSE, TRUE, &x1, &y1, NULL);
/* Clear the selection */
gimp_channel_clear (GIMP_CHANNEL (selection), NULL, TRUE);
/* Create a new layer from the buffer, using the drawable's type
* because it may be different from the image's type if we cut from
* a channel or layer mask
*/
layer = gimp_layer_new_from_tiles (tiles,
image,
gimp_drawable_type_with_alpha (drawable),
_("Floated Layer"),
GIMP_OPACITY_OPAQUE, GIMP_NORMAL_MODE);
/* Set the offsets */
gimp_item_set_offset (GIMP_ITEM (layer), x1 + off_x, y1 + off_y);
/* Free the temp buffer */
tile_manager_unref (tiles);
/* Add the floating layer to the image */
floating_sel_attach (layer, drawable);
/* End an undo group */
gimp_image_undo_group_end (image);
/* invalidate the image's boundary variables */
GIMP_CHANNEL (selection)->boundary_known = FALSE;
return layer;
}
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