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647f0ada2af7b91c7b5110b46a0230cd3f79f112
gimp/app/core/gimpselection.c
Michael Natterer bc8d5f84d6 app: remove the "offset" API from TileManager 
It made the transform code hard to read and never belonged into the
tile manager anyway. It's a simple pixel buffer that should not know
about any position in an image. Instead, pass around the offsets of
tile managers explicitly, so everything is less obscure for the price
of having more parameters. This will also help replacing TileManagers
with GeglBuffers.
2011-03-26 08:30:15 +01:00

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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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