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gimp/app/core/gimpitem.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib-object.h>
#include "libgimpbase/gimpbase.h"
#include "core-types.h"
#include "gimp.h"
#include "gimp-parasites.h"
#include "gimpchannel.h"
#include "gimpimage.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimpitem.h"
#include "gimplayer.h"
#include "gimplist.h"
#include "gimpmarshal.h"
#include "gimpparasitelist.h"
#include "vectors/gimpvectors.h"
#include "gimp-intl.h"
enum
{
REMOVED,
LINKED_CHANGED,
LAST_SIGNAL
};
/* local function prototypes */
static void gimp_item_class_init (GimpItemClass *klass);
static void gimp_item_init (GimpItem *item);
static void gimp_item_finalize (GObject *object);
static void gimp_item_name_changed (GimpObject *object);
static gsize gimp_item_get_memsize (GimpObject *object,
gsize *gui_size);
static GimpItem * gimp_item_real_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha);
static void gimp_item_real_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc);
static void gimp_item_real_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo);
static void gimp_item_real_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation);
static void gimp_item_real_resize (GimpItem *item,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
/* private variables */
static guint gimp_item_signals[LAST_SIGNAL] = { 0 };
static GimpViewableClass *parent_class = NULL;
GType
gimp_item_get_type (void)
{
static GType item_type = 0;
if (! item_type)
{
static const GTypeInfo item_info =
{
sizeof (GimpItemClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_item_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpItem),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_item_init,
};
item_type = g_type_register_static (GIMP_TYPE_VIEWABLE,
"GimpItem",
&item_info, 0);
}
return item_type;
}
static void
gimp_item_class_init (GimpItemClass *klass)
{
GObjectClass *object_class;
GimpObjectClass *gimp_object_class;
object_class = G_OBJECT_CLASS (klass);
gimp_object_class = GIMP_OBJECT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
gimp_item_signals[REMOVED] =
g_signal_new ("removed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpItemClass, removed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
gimp_item_signals[LINKED_CHANGED] =
g_signal_new ("linked_changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpItemClass, linked_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->finalize = gimp_item_finalize;
gimp_object_class->name_changed = gimp_item_name_changed;
gimp_object_class->get_memsize = gimp_item_get_memsize;
klass->removed = NULL;
klass->linked_changed = NULL;
klass->duplicate = gimp_item_real_duplicate;
klass->rename = gimp_item_real_rename;
klass->translate = gimp_item_real_translate;
klass->scale = gimp_item_real_scale;
klass->resize = gimp_item_real_resize;
klass->flip = NULL;
klass->rotate = NULL;
klass->transform = NULL;
}
static void
gimp_item_init (GimpItem *item)
{
item->ID = 0;
item->tattoo = 0;
item->gimage = NULL;
item->parasites = gimp_parasite_list_new ();
item->width = 0;
item->height = 0;
item->offset_x = 0;
item->offset_y = 0;
item->linked = FALSE;
}
static void
gimp_item_finalize (GObject *object)
{
GimpItem *item = GIMP_ITEM (object);
if (item->gimage && item->gimage->gimp)
{
g_hash_table_remove (item->gimage->gimp->item_table,
GINT_TO_POINTER (item->ID));
item->gimage = NULL;
}
if (item->parasites)
{
g_object_unref (item->parasites);
item->parasites = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_item_name_changed (GimpObject *object)
{
GimpItem *item;
GimpList *list = NULL;
item = GIMP_ITEM (object);
/* if no other items to check name against */
if (item->gimage == NULL)
return;
if (GIMP_IS_LAYER (item))
list = GIMP_LIST (item->gimage->layers);
else if (GIMP_IS_CHANNEL (item))
list = GIMP_LIST (item->gimage->channels);
else if (GIMP_IS_VECTORS (item))
list = GIMP_LIST (item->gimage->vectors);
if (list)
gimp_list_uniquefy_name (list, object, FALSE);
}
static gsize
gimp_item_get_memsize (GimpObject *object,
gsize *gui_size)
{
GimpItem *item;
gsize memsize = 0;
item = GIMP_ITEM (object);
memsize += gimp_object_get_memsize (GIMP_OBJECT (item->parasites), gui_size);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static GimpItem *
gimp_item_real_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha)
{
GimpItem *new_item;
gchar *new_name;
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (item->gimage), NULL);
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_ITEM), NULL);
/* formulate the new name */
{
const gchar *name;
gchar *ext;
gint number;
gint len;
name = gimp_object_get_name (GIMP_OBJECT (item));
g_return_val_if_fail (name != NULL, NULL);
ext = strrchr (name, '#');
len = strlen (_("copy"));
if ((strlen (name) >= len &&
strcmp (&name[strlen (name) - len], _("copy")) == 0) ||
(ext && (number = atoi (ext + 1)) > 0 &&
((int)(log10 (number) + 1)) == strlen (ext + 1)))
{
/* don't have redundant "copy"s */
new_name = g_strdup (name);
}
else
{
new_name = g_strdup_printf (_("%s copy"), name);
}
}
new_item = g_object_new (new_type, NULL);
gimp_item_configure (new_item, gimp_item_get_image (item),
item->offset_x, item->offset_y,
item->width, item->height,
new_name);
g_free (new_name);
g_object_unref (new_item->parasites);
new_item->parasites = gimp_parasite_list_copy (item->parasites);
new_item->linked = item->linked;
return new_item;
}
static void
gimp_item_real_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc)
{
if (item->gimage)
gimp_image_undo_push_item_rename (item->gimage, undo_desc, item);
gimp_object_set_name (GIMP_OBJECT (item), new_name);
}
static void
gimp_item_real_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
item->offset_x += offset_x;
item->offset_y += offset_y;
}
static void
gimp_item_real_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation)
{
item->width = new_width;
item->height = new_height;
item->offset_x = new_offset_x;
item->offset_y = new_offset_y;
}
static void
gimp_item_real_resize (GimpItem *item,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
item->offset_x = item->offset_x - offset_x;
item->offset_y = item->offset_y - offset_y;
item->width = new_width;
item->height = new_height;
}
void
gimp_item_removed (GimpItem *item)
{
g_return_if_fail (GIMP_IS_ITEM (item));
g_signal_emit (item, gimp_item_signals[REMOVED], 0);
}
void
gimp_item_configure (GimpItem *item,
GimpImage *gimage,
gint offset_x,
gint offset_y,
gint width,
gint height,
const gchar *name)
{
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (GIMP_IS_IMAGE (gimage));
if (item->ID == 0)
{
item->ID = gimage->gimp->next_item_ID++;
g_hash_table_insert (gimage->gimp->item_table,
GINT_TO_POINTER (item->ID),
item);
gimp_item_set_image (item, gimage);
}
item->width = width;
item->height = height;
item->offset_x = offset_x;
item->offset_y = offset_y;
gimp_object_set_name (GIMP_OBJECT (item), name ? name : _("Unnamed"));
}
GimpItem *
gimp_item_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (item->gimage), NULL);
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_ITEM), NULL);
return GIMP_ITEM_GET_CLASS (item)->duplicate (item, new_type, add_alpha);
}
void
gimp_item_rename (GimpItem *item,
const gchar *new_name)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
if (! new_name || ! *new_name)
new_name = item_class->default_name;
if (strcmp (new_name, gimp_object_get_name (GIMP_OBJECT (item))))
item_class->rename (item, new_name, item_class->rename_desc);
}
gint
gimp_item_width (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), -1);
return item->width;
}
gint
gimp_item_height (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), -1);
return item->height;
}
void
gimp_item_offsets (const GimpItem *item,
gint *off_x,
gint *off_y)
{
g_return_if_fail (GIMP_IS_ITEM (item));
if (off_x) *off_x = item->offset_x;
if (off_y) *off_y = item->offset_y;
}
void
gimp_item_translate (GimpItem *item,
gint off_x,
gint off_y,
gboolean push_undo)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->translate (item, off_x, off_y, push_undo);
}
/**
* gimp_item_check_scaling:
* @item: Item to check
* @new_width: proposed width of item, in pixels
* @new_height: proposed height of item, in pixels
*
* Scales item dimensions, then snaps them to pixel centers
*
* Returns: #FALSE if any dimension reduces to zero as a result
* of this; otherwise, returns #TRUE.
**/
gboolean
gimp_item_check_scaling (const GimpItem *item,
gint new_width,
gint new_height)
{
GimpImage *gimage;
gdouble img_scale_w;
gdouble img_scale_h;
gint new_item_width;
gint new_item_height;
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
gimage = gimp_item_get_image (item);
img_scale_w = (gdouble) new_width / (gdouble) gimage->width;
img_scale_h = (gdouble) new_height / (gdouble) gimage->height;
new_item_width = ROUND (img_scale_w * (gdouble) item->width);
new_item_height = ROUND (img_scale_h * (gdouble) item->height);
return (new_item_width > 0 && new_item_height > 0);
}
void
gimp_item_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
if (new_width < 1 || new_height < 1)
return;
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->scale (item, new_width, new_height, new_offset_x, new_offset_y,
interpolation);
}
/**
* gimp_item_scale_by_factors:
* @item: Item to be transformed by explicit width and height factors.
* @w_factor: scale factor to apply to width and horizontal offset
* @h_factor: scale factor to apply to height and vertical offset
* @interpolation:
*
* Scales item dimensions and offsets by uniform width and
* height factors.
*
* Use gimp_item_scale_by_factors() in circumstances when the
* same width and height scaling factors are to be uniformly
* applied to a set of items. In this context, the item's
* dimensions and offsets from the sides of the containing
* image all change by these predetermined factors. By fiat,
* the fixed point of the transform is the upper left hand
* corner of the image. Returns gboolean FALSE if a requested
* scale factor is zero or if a scaling zero's out a item
* dimension; returns #TRUE otherwise.
*
* Use gimp_item_scale() in circumstances where new item width
* and height dimensions are predetermined instead.
*
* Side effects: Undo set created for item. Old item imagery
* scaled & painted to new item tiles.
*
* Returns: #TRUE, if the scaled item has positive dimensions
* #FALSE if the scaled item has at least one zero dimension
**/
gboolean
gimp_item_scale_by_factors (GimpItem *item,
gdouble w_factor,
gdouble h_factor,
GimpInterpolationType interpolation)
{
gint new_width, new_height;
gint new_offset_x, new_offset_y;
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
if (w_factor == 0.0 || h_factor == 0.0)
{
g_message ("gimp_item_scale_by_factors: Error. Requested width or height scale equals zero.");
return FALSE;
}
new_offset_x = ROUND (w_factor * (gdouble) item->offset_x);
new_offset_y = ROUND (h_factor * (gdouble) item->offset_y);
new_width = ROUND (w_factor * (gdouble) item->width);
new_height = ROUND (h_factor * (gdouble) item->height);
if (new_width != 0 && new_height != 0)
{
gimp_item_scale (item,
new_width, new_height,
new_offset_x, new_offset_y,
interpolation);
return TRUE;
}
return FALSE;
}
/**
* gimp_item_scale_by_origin:
* @item: The item to be transformed by width & height scale factors
* @new_width: The width that item will acquire
* @new_height: The height that the item will acquire
* @interpolation:
* @local_origin: sets fixed point of the scaling transform. See below.
*
* Sets item dimensions to new_width and
* new_height. Derives vertical and horizontal scaling
* transforms from new width and height. If local_origin is
* TRUE, the fixed point of the scaling transform coincides
* with the item's center point. Otherwise, the fixed
* point is taken to be [-item->offset_x, -item->offset_y].
*
* Since this function derives scale factors from new and
* current item dimensions, these factors will vary from
* item to item because of aliasing artifacts; factor
* variations among items can be quite large where item
* dimensions approach pixel dimensions. Use
* gimp_item_scale_by_factors() where constant scales are to
* be uniformly applied to a number of items.
*
* Side effects: undo set created for item.
* Old item imagery scaled
* & painted to new item tiles
**/
void
gimp_item_scale_by_origin (GimpItem *item,
gint new_width,
gint new_height,
GimpInterpolationType interpolation,
gboolean local_origin)
{
gint new_offset_x, new_offset_y;
g_return_if_fail (GIMP_IS_ITEM (item));
if (new_width == 0 || new_height == 0)
{
g_message ("gimp_layer_scale: Error. Requested width or height equals zero.");
return;
}
if (local_origin)
{
new_offset_x = item->offset_x + ((item->width - new_width) / 2.0);
new_offset_y = item->offset_y + ((item->height - new_height) / 2.0);
}
else
{
new_offset_x = (gint) (((gdouble) new_width *
(gdouble) item->offset_x /
(gdouble) item->width));
new_offset_y = (gint) (((gdouble) new_height *
(gdouble) item->offset_y /
(gdouble) item->height));
}
gimp_item_scale (item,
new_width, new_height,
new_offset_x, new_offset_y,
interpolation);
}
void
gimp_item_resize (GimpItem *item,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
if (new_width < 1 || new_height < 1)
return;
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->resize (item, new_width, new_height, offset_x, offset_y);
}
void
gimp_item_flip (GimpItem *item,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->flip (item, flip_type, axis, clip_result);
}
void
gimp_item_rotate (GimpItem *item,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->rotate (item, rotate_type, center_x, center_y, clip_result);
}
void
gimp_item_transform (GimpItem *item,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation,
gboolean clip_result,
GimpProgressFunc progress_callback,
gpointer progress_data)
{
GimpItemClass *item_class;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
item_class->transform (item, matrix, direction, interpolation,
clip_result,
progress_callback, progress_data);
}
gint
gimp_item_get_ID (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), -1);
return item->ID;
}
GimpItem *
gimp_item_get_by_ID (Gimp *gimp,
gint item_id)
{
g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);
if (gimp->item_table == NULL)
return NULL;
return (GimpItem *) g_hash_table_lookup (gimp->item_table,
GINT_TO_POINTER (item_id));
}
GimpTattoo
gimp_item_get_tattoo (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), 0);
return item->tattoo;
}
void
gimp_item_set_tattoo (GimpItem *item,
GimpTattoo tattoo)
{
g_return_if_fail (GIMP_IS_ITEM (item));
item->tattoo = tattoo;
}
GimpImage *
gimp_item_get_image (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
return item->gimage;
}
void
gimp_item_set_image (GimpItem *item,
GimpImage *gimage)
{
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (! gimage || GIMP_IS_IMAGE (gimage));
if (gimage == NULL)
{
item->tattoo = 0;
}
else if (item->tattoo == 0 || item->gimage != gimage)
{
item->tattoo = gimp_image_get_new_tattoo (gimage);
}
item->gimage = gimage;
}
void
gimp_item_parasite_attach (GimpItem *item,
GimpParasite *parasite)
{
g_return_if_fail (GIMP_IS_ITEM (item));
/* only set the dirty bit manually if we can be saved and the new
* parasite differs from the current one and we arn't undoable
*/
if (gimp_parasite_is_undoable (parasite))
{
/* do a group in case we have attach_parent set */
gimp_image_undo_group_start (item->gimage, GIMP_UNDO_GROUP_PARASITE_ATTACH,
_("Attach Parasite"));
gimp_image_undo_push_item_parasite (item->gimage, NULL, item, parasite);
}
else if (gimp_parasite_is_persistent (parasite) &&
! gimp_parasite_compare (parasite,
gimp_item_parasite_find
(item, gimp_parasite_name (parasite))))
{
gimp_image_undo_push_cantundo (item->gimage,
_("Attach Parasite to Item"));
}
gimp_parasite_list_add (item->parasites, parasite);
if (gimp_parasite_has_flag (parasite, GIMP_PARASITE_ATTACH_PARENT))
{
gimp_parasite_shift_parent (parasite);
gimp_image_parasite_attach (item->gimage, parasite);
}
else if (gimp_parasite_has_flag (parasite, GIMP_PARASITE_ATTACH_GRANDPARENT))
{
gimp_parasite_shift_parent (parasite);
gimp_parasite_shift_parent (parasite);
gimp_parasite_attach (item->gimage->gimp, parasite);
}
if (gimp_parasite_is_undoable (parasite))
{
gimp_image_undo_group_end (item->gimage);
}
}
void
gimp_item_parasite_detach (GimpItem *item,
const gchar *name)
{
GimpParasite *parasite;
g_return_if_fail (GIMP_IS_ITEM (item));
parasite = gimp_parasite_list_find (item->parasites, name);
if (! parasite)
return;
if (gimp_parasite_is_undoable (parasite))
{
gimp_image_undo_push_item_parasite_remove (item->gimage,
_("Remove Parasite from Item"),
item,
gimp_parasite_name (parasite));
}
else if (gimp_parasite_is_persistent (parasite))
{
gimp_image_undo_push_cantundo (item->gimage,
_("Remove Parasite from Item"));
}
gimp_parasite_list_remove (item->parasites, name);
}
GimpParasite *
gimp_item_parasite_find (const GimpItem *item,
const gchar *name)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
return gimp_parasite_list_find (item->parasites, name);
}
static void
gimp_item_parasite_list_foreach_func (gchar *name,
GimpParasite *parasite,
gchar ***cur)
{
*(*cur)++ = (gchar *) g_strdup (name);
}
gchar **
gimp_item_parasite_list (const GimpItem *item,
gint *count)
{
gchar **list;
gchar **cur;
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
g_return_val_if_fail (count != NULL, NULL);
*count = gimp_parasite_list_length (item->parasites);
cur = list = g_new (gchar *, *count);
gimp_parasite_list_foreach (item->parasites,
(GHFunc) gimp_item_parasite_list_foreach_func,
&cur);
return list;
}
void
gimp_item_set_linked (GimpItem *item,
gboolean linked,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_ITEM (item));
if (item->linked != linked)
{
if (push_undo)
{
GimpImage *gimage = gimp_item_get_image (item);
if (gimage)
gimp_image_undo_push_item_linked (gimage, NULL, item);
}
item->linked = linked ? TRUE : FALSE;
g_signal_emit (item, gimp_item_signals[LINKED_CHANGED], 0);
}
}
gboolean
gimp_item_get_linked (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return item->linked;
}
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