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PIKApp/app/core/pikaselection.c

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/* 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 <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikacolor/pikacolor.h"
#include "core-types.h"
#include "gegl/pika-babl.h"
#include "gegl/pika-gegl-apply-operation.h"
#include "gegl/pika-gegl-loops.h"
#include "pika.h"
#include "pikacontext.h"
#include "pikadrawable-edit.h"
#include "pikadrawable-private.h"
#include "pikaerror.h"
#include "pikaimage.h"
#include "pikaimage-new.h"
#include "pikaimage-undo.h"
#include "pikaimage-undo-push.h"
#include "pikalayer.h"
#include "pikalayer-new.h"
#include "pikalayermask.h"
#include "pikalayer-floating-selection.h"
#include "pikapickable.h"
#include "pikaselection.h"
#include "pika-intl.h"
static gboolean pika_selection_is_attached (PikaItem *item);
static PikaItemTree * pika_selection_get_tree (PikaItem *item);
static void pika_selection_translate (PikaItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo);
static void pika_selection_scale (PikaItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
PikaInterpolationType interp_type,
PikaProgress *progress);
static void pika_selection_resize (PikaItem *item,
PikaContext *context,
PikaFillType fill_type,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
static void pika_selection_flip (PikaItem *item,
PikaContext *context,
PikaOrientationType flip_type,
gdouble axis,
gboolean clip_result);
static void pika_selection_rotate (PikaItem *item,
PikaContext *context,
PikaRotationType rotation_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result);
static gboolean pika_selection_fill (PikaItem *item,
PikaDrawable *drawable,
PikaFillOptions *fill_options,
gboolean push_undo,
PikaProgress *progress,
GError **error);
static gboolean pika_selection_stroke (PikaItem *item,
PikaDrawable *drawable,
PikaStrokeOptions *stroke_options,
gboolean push_undo,
PikaProgress *progress,
GError **error);
static void pika_selection_convert_type (PikaDrawable *drawable,
PikaImage *dest_image,
const Babl *new_format,
PikaColorProfile *src_profile,
PikaColorProfile *dest_profile,
GeglDitherMethod layer_dither_type,
GeglDitherMethod mask_dither_type,
gboolean push_undo,
PikaProgress *progress);
static void pika_selection_invalidate_boundary (PikaDrawable *drawable);
static gboolean pika_selection_boundary (PikaChannel *channel,
const PikaBoundSeg **segs_in,
const PikaBoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out,
gint x1,
gint y1,
gint x2,
gint y2);
static gboolean pika_selection_is_empty (PikaChannel *channel);
static void pika_selection_feather (PikaChannel *channel,
gdouble radius_x,
gdouble radius_y,
gboolean edge_lock,
gboolean push_undo);
static void pika_selection_sharpen (PikaChannel *channel,
gboolean push_undo);
static void pika_selection_clear (PikaChannel *channel,
const gchar *undo_desc,
gboolean push_undo);
static void pika_selection_all (PikaChannel *channel,
gboolean push_undo);
static void pika_selection_invert (PikaChannel *channel,
gboolean push_undo);
static void pika_selection_border (PikaChannel *channel,
gint radius_x,
gint radius_y,
PikaChannelBorderStyle style,
gboolean edge_lock,
gboolean push_undo);
static void pika_selection_grow (PikaChannel *channel,
gint radius_x,
gint radius_y,
gboolean push_undo);
static void pika_selection_shrink (PikaChannel *channel,
gint radius_x,
gint radius_y,
gboolean edge_lock,
gboolean push_undo);
static void pika_selection_flood (PikaChannel *channel,
gboolean push_undo);
G_DEFINE_TYPE (PikaSelection, pika_selection, PIKA_TYPE_CHANNEL)
#define parent_class pika_selection_parent_class
static void
pika_selection_class_init (PikaSelectionClass *klass)
{
PikaViewableClass *viewable_class = PIKA_VIEWABLE_CLASS (klass);
PikaItemClass *item_class = PIKA_ITEM_CLASS (klass);
PikaDrawableClass *drawable_class = PIKA_DRAWABLE_CLASS (klass);
PikaChannelClass *channel_class = PIKA_CHANNEL_CLASS (klass);
viewable_class->default_icon_name = "pika-selection";
item_class->is_attached = pika_selection_is_attached;
item_class->get_tree = pika_selection_get_tree;
item_class->translate = pika_selection_translate;
item_class->scale = pika_selection_scale;
item_class->resize = pika_selection_resize;
item_class->flip = pika_selection_flip;
item_class->rotate = pika_selection_rotate;
item_class->fill = pika_selection_fill;
item_class->stroke = pika_selection_stroke;
item_class->default_name = _("Selection Mask");
item_class->translate_desc = C_("undo-type", "Move Selection");
item_class->fill_desc = C_("undo-type", "Fill Selection");
item_class->stroke_desc = C_("undo-type", "Stroke Selection");
drawable_class->convert_type = pika_selection_convert_type;
drawable_class->invalidate_boundary = pika_selection_invalidate_boundary;
channel_class->boundary = pika_selection_boundary;
channel_class->is_empty = pika_selection_is_empty;
channel_class->feather = pika_selection_feather;
channel_class->sharpen = pika_selection_sharpen;
channel_class->clear = pika_selection_clear;
channel_class->all = pika_selection_all;
channel_class->invert = pika_selection_invert;
channel_class->border = pika_selection_border;
channel_class->grow = pika_selection_grow;
channel_class->shrink = pika_selection_shrink;
channel_class->flood = pika_selection_flood;
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");
channel_class->flood_desc = C_("undo-type", "Remove Holes");
}
static void
pika_selection_init (PikaSelection *selection)
{
}
static gboolean
pika_selection_is_attached (PikaItem *item)
{
return (PIKA_IS_IMAGE (pika_item_get_image (item)) &&
pika_image_get_mask (pika_item_get_image (item)) ==
PIKA_CHANNEL (item));
}
static PikaItemTree *
pika_selection_get_tree (PikaItem *item)
{
return NULL;
}
static void
pika_selection_translate (PikaItem *item,
gdouble offset_x,
gdouble offset_y,
gboolean push_undo)
{
PIKA_ITEM_CLASS (parent_class)->translate (item, offset_x, offset_y,
push_undo);
}
static void
pika_selection_scale (PikaItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
PikaInterpolationType interp_type,
PikaProgress *progress)
{
PIKA_ITEM_CLASS (parent_class)->scale (item, new_width, new_height,
new_offset_x, new_offset_y,
interp_type, progress);
pika_item_set_offset (item, 0, 0);
}
static void
pika_selection_resize (PikaItem *item,
PikaContext *context,
PikaFillType fill_type,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
PIKA_ITEM_CLASS (parent_class)->resize (item, context, PIKA_FILL_TRANSPARENT,
new_width, new_height,
offset_x, offset_y);
pika_item_set_offset (item, 0, 0);
}
static void
pika_selection_flip (PikaItem *item,
PikaContext *context,
PikaOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
PIKA_ITEM_CLASS (parent_class)->flip (item, context, flip_type, axis, TRUE);
}
static void
pika_selection_rotate (PikaItem *item,
PikaContext *context,
PikaRotationType rotation_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
PIKA_ITEM_CLASS (parent_class)->rotate (item, context, rotation_type,
center_x, center_y,
clip_result);
}
static gboolean
pika_selection_fill (PikaItem *item,
PikaDrawable *drawable,
PikaFillOptions *fill_options,
gboolean push_undo,
PikaProgress *progress,
GError **error)
{
PikaSelection *selection = PIKA_SELECTION (item);
const PikaBoundSeg *dummy_in;
const PikaBoundSeg *dummy_out;
gint num_dummy_in;
gint num_dummy_out;
gboolean retval;
if (! pika_channel_boundary (PIKA_CHANNEL (selection),
&dummy_in, &dummy_out,
&num_dummy_in, &num_dummy_out,
0, 0, 0, 0))
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("There is no selection to fill."));
return FALSE;
}
pika_selection_suspend (selection);
retval = PIKA_ITEM_CLASS (parent_class)->fill (item, drawable,
fill_options,
push_undo, progress, error);
pika_selection_resume (selection);
return retval;
}
static gboolean
pika_selection_stroke (PikaItem *item,
PikaDrawable *drawable,
PikaStrokeOptions *stroke_options,
gboolean push_undo,
PikaProgress *progress,
GError **error)
{
PikaSelection *selection = PIKA_SELECTION (item);
const PikaBoundSeg *dummy_in;
const PikaBoundSeg *dummy_out;
gint num_dummy_in;
gint num_dummy_out;
gboolean retval;
if (! pika_channel_boundary (PIKA_CHANNEL (selection),
&dummy_in, &dummy_out,
&num_dummy_in, &num_dummy_out,
0, 0, 0, 0))
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("There is no selection to stroke."));
return FALSE;
}
pika_selection_suspend (selection);
retval = PIKA_ITEM_CLASS (parent_class)->stroke (item, drawable,
stroke_options,
push_undo, progress, error);
pika_selection_resume (selection);
return retval;
}
static void
pika_selection_convert_type (PikaDrawable *drawable,
PikaImage *dest_image,
const Babl *new_format,
PikaColorProfile *src_profile,
PikaColorProfile *dest_profile,
GeglDitherMethod layer_dither_type,
GeglDitherMethod mask_dither_type,
gboolean push_undo,
PikaProgress *progress)
{
new_format =
pika_babl_mask_format (pika_babl_format_get_precision (new_format));
PIKA_DRAWABLE_CLASS (parent_class)->convert_type (drawable, dest_image,
new_format,
src_profile,
dest_profile,
layer_dither_type,
mask_dither_type,
push_undo,
progress);
}
static void
pika_selection_invalidate_boundary (PikaDrawable *drawable)
{
PikaImage *image = pika_item_get_image (PIKA_ITEM (drawable));
GList *layers;
/* Turn the current selection off */
pika_image_selection_invalidate (image);
PIKA_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
*/
layers = pika_image_get_selected_layers (image);
if (g_list_length (layers) == 1 && pika_layer_is_floating_sel (layers->data))
{
pika_drawable_update (PIKA_DRAWABLE (layers->data), 0, 0, -1, -1);
}
#if 0
/* invalidate the preview */
drawable->private->preview_valid = FALSE;
#endif
}
static gboolean
pika_selection_boundary (PikaChannel *channel,
const PikaBoundSeg **segs_in,
const PikaBoundSeg **segs_out,
gint *num_segs_in,
gint *num_segs_out,
gint unused1,
gint unused2,
gint unused3,
gint unused4)
{
PikaImage *image = pika_item_get_image (PIKA_ITEM (channel));
PikaLayer *floating_selection;
GList *drawables;
GList *layers;
gboolean channel_selected;
drawables = pika_image_get_selected_drawables (image);
channel_selected = (drawables && PIKA_IS_CHANNEL (drawables->data));
g_list_free (drawables);
if ((floating_selection = pika_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 */
PIKA_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 (floating_selection, num_segs_in);
return TRUE;
}
else if (channel_selected)
{
/* Otherwise, return the boundary...if a channels are selected */
return PIKA_CHANNEL_CLASS (parent_class)->boundary (channel,
segs_in, segs_out,
num_segs_in,
num_segs_out,
0, 0,
pika_image_get_width (image),
pika_image_get_height (image));
}
else if ((layers = pika_image_get_selected_layers (image)))
{
/* If layers are selected, we return multiple boundaries based
* on the extents
*/
GList *iter;
gint x1, y1;
gint x2 = G_MININT;
gint y2 = G_MININT;
gint offset_x = G_MAXINT;
gint offset_y = G_MAXINT;
for (iter = layers; iter; iter = iter->next)
{
gint item_off_x, item_off_y;
gint item_x2, item_y2;
pika_item_get_offset (iter->data, &item_off_x, &item_off_y);
offset_x = MIN (offset_x, item_off_x);
offset_y = MIN (offset_y, item_off_y);
item_x2 = item_off_x + pika_item_get_width (PIKA_ITEM (iter->data));
item_y2 = item_off_y + pika_item_get_height (PIKA_ITEM (iter->data));
x2 = MAX (x2, item_x2);
y2 = MAX (y2, item_y2);
}
x1 = CLAMP (offset_x, 0, pika_image_get_width (image));
y1 = CLAMP (offset_y, 0, pika_image_get_height (image));
x2 = CLAMP (x2, 0, pika_image_get_width (image));
y2 = CLAMP (y2, 0, pika_image_get_height (image));
return PIKA_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
pika_selection_is_empty (PikaChannel *channel)
{
PikaSelection *selection = PIKA_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->suspend_count > 0)
return TRUE;
return PIKA_CHANNEL_CLASS (parent_class)->is_empty (channel);
}
static void
pika_selection_feather (PikaChannel *channel,
gdouble radius_x,
gdouble radius_y,
gboolean edge_lock,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->feather (channel, radius_x, radius_y,
edge_lock, push_undo);
}
static void
pika_selection_sharpen (PikaChannel *channel,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->sharpen (channel, push_undo);
}
static void
pika_selection_clear (PikaChannel *channel,
const gchar *undo_desc,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->clear (channel, undo_desc, push_undo);
}
static void
pika_selection_all (PikaChannel *channel,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->all (channel, push_undo);
}
static void
pika_selection_invert (PikaChannel *channel,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->invert (channel, push_undo);
}
static void
pika_selection_border (PikaChannel *channel,
gint radius_x,
gint radius_y,
PikaChannelBorderStyle style,
gboolean edge_lock,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->border (channel,
radius_x, radius_y,
style, edge_lock,
push_undo);
}
static void
pika_selection_grow (PikaChannel *channel,
gint radius_x,
gint radius_y,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->grow (channel,
radius_x, radius_y,
push_undo);
}
static void
pika_selection_shrink (PikaChannel *channel,
gint radius_x,
gint radius_y,
gboolean edge_lock,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->shrink (channel,
radius_x, radius_y, edge_lock,
push_undo);
}
static void
pika_selection_flood (PikaChannel *channel,
gboolean push_undo)
{
PIKA_CHANNEL_CLASS (parent_class)->flood (channel, push_undo);
}
/* public functions */
PikaChannel *
pika_selection_new (PikaImage *image,
gint width,
gint height)
{
PikaRGB black = { 0.0, 0.0, 0.0, 0.5 };
PikaChannel *channel;
g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
g_return_val_if_fail (width > 0 && height > 0, NULL);
channel = PIKA_CHANNEL (pika_drawable_new (PIKA_TYPE_SELECTION,
image, NULL,
0, 0, width, height,
pika_image_get_mask_format (image)));
pika_channel_set_color (channel, &black, FALSE);
pika_channel_set_show_masked (channel, TRUE);
channel->x2 = width;
channel->y2 = height;
return channel;
}
gint
pika_selection_suspend (PikaSelection *selection)
{
g_return_val_if_fail (PIKA_IS_SELECTION (selection), 0);
selection->suspend_count++;
return selection->suspend_count;
}
gint
pika_selection_resume (PikaSelection *selection)
{
g_return_val_if_fail (PIKA_IS_SELECTION (selection), 0);
g_return_val_if_fail (selection->suspend_count > 0, 0);
selection->suspend_count--;
return selection->suspend_count;
}
GeglBuffer *
pika_selection_extract (PikaSelection *selection,
GList *pickables,
PikaContext *context,
gboolean cut_image,
gboolean keep_indexed,
gboolean add_alpha,
gint *offset_x,
gint *offset_y,
GError **error)
{
PikaImage *image = NULL;
PikaImage *temp_image = NULL;
PikaPickable *pickable = NULL;
GeglBuffer *src_buffer;
GeglBuffer *dest_buffer;
GList *iter;
const Babl *src_format;
const Babl *dest_format;
gint x1, y1, x2, y2;
gboolean non_empty;
gint off_x, off_y;
g_return_val_if_fail (PIKA_IS_SELECTION (selection), NULL);
g_return_val_if_fail (PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
g_return_val_if_fail (pickables != NULL, NULL);
for (iter = pickables; iter; iter = iter->next)
{
g_return_val_if_fail (PIKA_IS_PICKABLE (iter->data), NULL);
if (PIKA_IS_ITEM (iter->data))
g_return_val_if_fail (pika_item_is_attached (iter->data), NULL);
if (! image)
image = pika_pickable_get_image (iter->data);
else
g_return_val_if_fail (image == pika_pickable_get_image (iter->data), NULL);
}
if (g_list_length (pickables) == 1)
{
pickable = pickables->data;
}
else
{
for (iter = pickables; iter; iter = iter->next)
g_return_val_if_fail (PIKA_IS_DRAWABLE (iter->data), NULL);
temp_image = pika_image_new_from_drawables (image->pika, pickables, TRUE, FALSE);
selection = PIKA_SELECTION (pika_image_get_mask (temp_image));
pickable = PIKA_PICKABLE (temp_image);
/* Don't cut from the temporary image. */
cut_image = FALSE;
}
/* 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 (PIKA_IS_DRAWABLE (pickable))
{
non_empty = pika_item_mask_bounds (PIKA_ITEM (pickable),
&x1, &y1, &x2, &y2);
pika_item_get_offset (PIKA_ITEM (pickable), &off_x, &off_y);
}
else
{
non_empty = pika_item_bounds (PIKA_ITEM (selection),
&x1, &y1, &x2, &y2);
x2 += x1;
y2 += y1;
off_x = 0;
off_y = 0;
/* can't cut from non-drawables, fall back to copy */
cut_image = FALSE;
}
if (non_empty && ((x1 == x2) || (y1 == y2)))
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("Unable to cut or copy because the "
"selected region is empty."));
if (temp_image)
g_object_unref (temp_image);
return NULL;
}
/* If there is a selection, we must add alpha because the selection
* could have any shape.
*/
if (non_empty)
add_alpha = TRUE;
src_format = pika_pickable_get_format (pickable);
/* How many bytes in the temp buffer? */
if (babl_format_is_palette (src_format) && ! keep_indexed)
{
dest_format = pika_image_get_format (image, PIKA_RGB,
pika_image_get_precision (image),
add_alpha ||
babl_format_has_alpha (src_format),
babl_format_get_space (src_format));
}
else
{
if (add_alpha)
dest_format = pika_pickable_get_format_with_alpha (pickable);
else
dest_format = src_format;
}
pika_pickable_flush (pickable);
src_buffer = pika_pickable_get_buffer (pickable);
/* Allocate the temp buffer */
dest_buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, x2 - x1, y2 - y1),
dest_format);
/* First, copy the pixels, possibly doing INDEXED->RGB and adding alpha */
pika_gegl_buffer_copy (src_buffer, GEGL_RECTANGLE (x1, y1, x2 - x1, y2 - y1),
GEGL_ABYSS_NONE,
dest_buffer, GEGL_RECTANGLE (0, 0, 0, 0));
if (non_empty)
{
/* If there is a selection, mask the dest_buffer with it */
GeglBuffer *mask_buffer;
mask_buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (selection));
pika_gegl_apply_opacity (dest_buffer, NULL, NULL, dest_buffer,
mask_buffer,
- (off_x + x1),
- (off_y + y1),
1.0);
if (cut_image)
{
pika_drawable_edit_clear (PIKA_DRAWABLE (pickable), context);
}
}
else if (cut_image)
{
/* If we're cutting without selection, remove either the layer
* (or floating selection), the layer mask, or the channel
*/
if (PIKA_IS_LAYER (pickable))
{
pika_image_remove_layer (image, PIKA_LAYER (pickable),
TRUE, NULL);
}
else if (PIKA_IS_LAYER_MASK (pickable))
{
pika_layer_apply_mask (pika_layer_mask_get_layer (PIKA_LAYER_MASK (pickable)),
PIKA_MASK_DISCARD, TRUE);
}
else if (PIKA_IS_CHANNEL (pickable))
{
pika_image_remove_channel (image, PIKA_CHANNEL (pickable),
TRUE, NULL);
}
}
*offset_x = x1 + off_x;
*offset_y = y1 + off_y;
if (temp_image)
g_object_unref (temp_image);
return dest_buffer;
}
PikaLayer *
pika_selection_float (PikaSelection *selection,
GList *drawables,
PikaContext *context,
gboolean cut_image,
gint off_x,
gint off_y,
GError **error)
{
PikaImage *image;
PikaLayer *layer;
GeglBuffer *buffer;
PikaColorProfile *profile;
PikaImage *temp_image = NULL;
const Babl *format = NULL;
GList *iter;
gint x1, y1;
gint x2, y2;
g_return_val_if_fail (PIKA_IS_SELECTION (selection), NULL);
g_return_val_if_fail (PIKA_IS_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
for (iter = drawables; iter; iter = iter->next)
{
g_return_val_if_fail (PIKA_IS_DRAWABLE (iter->data), NULL);
g_return_val_if_fail (pika_item_is_attached (iter->data), NULL);
if (! format)
format = pika_drawable_get_format_with_alpha (iter->data);
else
g_return_val_if_fail (format == pika_drawable_get_format_with_alpha (iter->data),
NULL);
}
image = pika_item_get_image (PIKA_ITEM (selection));
/* Make sure there is a region to float... */
for (iter = drawables; iter; iter = iter->next)
{
if (pika_item_mask_bounds (iter->data, &x1, &y1, &x2, &y2) &&
x1 != x2 && y1 != y2)
break;
}
if (iter == NULL)
{
g_set_error_literal (error, PIKA_ERROR, PIKA_FAILED,
_("Cannot float selection because the selected "
"region is empty."));
return NULL;
}
/* Start an undo group */
pika_image_undo_group_start (image, PIKA_UNDO_GROUP_FS_FLOAT,
C_("undo-type", "Float Selection"));
/* Cut or copy the selected region */
buffer = pika_selection_extract (selection, drawables, context,
cut_image, FALSE, TRUE,
&x1, &y1, NULL);
profile = pika_color_managed_get_color_profile (PIKA_COLOR_MANAGED (drawables->data));
/* Clear the selection */
pika_channel_clear (PIKA_CHANNEL (selection), NULL, TRUE);
/* Create a new layer from the buffer, using the drawables' type
* because it may be different from the image's type if we cut from
* a channel or layer mask
*/
layer = pika_layer_new_from_gegl_buffer (buffer, image, format,
_("Floated Layer"),
PIKA_OPACITY_OPAQUE,
pika_image_get_default_new_layer_mode (image),
profile);
/* Set the offsets */
pika_item_set_offset (PIKA_ITEM (layer), x1 + off_x, y1 + off_y);
/* Free the temp buffer */
g_object_unref (buffer);
/* Add the floating layer to the image */
floating_sel_attach (layer, drawables->data);
/* End an undo group */
pika_image_undo_group_end (image);
/* invalidate the image's boundary variables */
PIKA_CHANNEL (selection)->boundary_known = FALSE;
if (temp_image)
g_object_unref (temp_image);
return layer;
}
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