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gimp/app/core/gimpitem.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 <stdlib.h>
#include <string.h>
#include <gegl.h>
#include "libgimpbase/gimpbase.h"
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "gimp.h"
#include "gimp-parasites.h"
#include "gimpdrawable.h"
#include "gimpimage.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimpitem.h"
#include "gimpitem-preview.h"
#include "gimplist.h"
#include "gimpmarshal.h"
#include "gimpparasitelist.h"
#include "gimpprogress.h"
#include "gimpstrokeoptions.h"
#include "gimp-intl.h"
enum
{
REMOVED,
VISIBILITY_CHANGED,
LINKED_CHANGED,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ID,
PROP_WIDTH,
PROP_HEIGHT,
PROP_OFFSET_X,
PROP_OFFSET_Y,
PROP_VISIBLE,
PROP_LINKED
};
/* local function prototypes */
static void gimp_item_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_item_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_item_finalize (GObject *object);
static gint64 gimp_item_get_memsize (GimpObject *object,
gint64 *gui_size);
static void gimp_item_real_visibility_changed
(GimpItem *item);
static GimpItem * gimp_item_real_duplicate (GimpItem *item,
GType new_type);
static void gimp_item_real_convert (GimpItem *item,
GimpImage *dest_image);
static gboolean gimp_item_real_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error);
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,
GimpProgress *progress);
static void gimp_item_real_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
static GeglNode * gimp_item_real_get_node (GimpItem *item);
static void gimp_item_sync_offset_node (GimpItem *item);
G_DEFINE_TYPE (GimpItem, gimp_item, GIMP_TYPE_VIEWABLE)
#define parent_class gimp_item_parent_class
static guint gimp_item_signals[LAST_SIGNAL] = { 0 };
static void
gimp_item_class_init (GimpItemClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (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[VISIBILITY_CHANGED] =
g_signal_new ("visibility-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpItemClass, visibility_changed),
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->set_property = gimp_item_set_property;
object_class->get_property = gimp_item_get_property;
object_class->finalize = gimp_item_finalize;
gimp_object_class->get_memsize = gimp_item_get_memsize;
viewable_class->get_preview_size = gimp_item_get_preview_size;
viewable_class->get_popup_size = gimp_item_get_popup_size;
klass->removed = NULL;
klass->visibility_changed = gimp_item_real_visibility_changed;
klass->linked_changed = NULL;
klass->is_attached = NULL;
klass->duplicate = gimp_item_real_duplicate;
klass->convert = gimp_item_real_convert;
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;
klass->stroke = NULL;
klass->get_node = gimp_item_real_get_node;
klass->default_name = NULL;
klass->rename_desc = NULL;
klass->translate_desc = NULL;
klass->scale_desc = NULL;
klass->resize_desc = NULL;
klass->flip_desc = NULL;
klass->rotate_desc = NULL;
klass->transform_desc = NULL;
g_object_class_install_property (object_class, PROP_ID,
g_param_spec_int ("id", NULL, NULL,
0, G_MAXINT, 0,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_WIDTH,
g_param_spec_int ("width", NULL, NULL,
1, GIMP_MAX_IMAGE_SIZE, 1,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_HEIGHT,
g_param_spec_int ("height", NULL, NULL,
1, GIMP_MAX_IMAGE_SIZE, 1,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_OFFSET_X,
g_param_spec_int ("offset-x", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_OFFSET_Y,
g_param_spec_int ("offset-y", NULL, NULL,
-GIMP_MAX_IMAGE_SIZE,
GIMP_MAX_IMAGE_SIZE, 0,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_VISIBLE,
g_param_spec_boolean ("visible", NULL, NULL,
TRUE,
GIMP_PARAM_READABLE));
g_object_class_install_property (object_class, PROP_LINKED,
g_param_spec_boolean ("linked", NULL, NULL,
FALSE,
GIMP_PARAM_READABLE));
}
static void
gimp_item_init (GimpItem *item)
{
g_object_force_floating (G_OBJECT (item));
item->ID = 0;
item->tattoo = 0;
item->image = NULL;
item->parasites = gimp_parasite_list_new ();
item->width = 0;
item->height = 0;
item->offset_x = 0;
item->offset_y = 0;
item->visible = TRUE;
item->linked = FALSE;
item->removed = FALSE;
item->node = NULL;
item->offset_node = NULL;
}
static void
gimp_item_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
switch (property_id)
{
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_item_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpItem *item = GIMP_ITEM (object);
switch (property_id)
{
case PROP_ID:
g_value_set_int (value, item->ID);
break;
case PROP_WIDTH:
g_value_set_int (value, item->width);
break;
case PROP_HEIGHT:
g_value_set_int (value, item->height);
break;
case PROP_OFFSET_X:
g_value_set_int (value, item->offset_x);
break;
case PROP_OFFSET_Y:
g_value_set_int (value, item->offset_y);
break;
case PROP_VISIBLE:
g_value_set_boolean (value, item->visible);
break;
case PROP_LINKED:
g_value_set_boolean (value, item->linked);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_item_finalize (GObject *object)
{
GimpItem *item = GIMP_ITEM (object);
if (item->node)
{
g_object_unref (item->node);
item->node = NULL;
}
if (item->image && item->image->gimp)
{
g_hash_table_remove (item->image->gimp->item_table,
GINT_TO_POINTER (item->ID));
item->image = NULL;
}
if (item->parasites)
{
g_object_unref (item->parasites);
item->parasites = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gint64
gimp_item_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpItem *item = GIMP_ITEM (object);
gint64 memsize = 0;
memsize += gimp_object_get_memsize (GIMP_OBJECT (item->parasites), gui_size);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static void
gimp_item_real_visibility_changed (GimpItem *item)
{
if (! item->node)
return;
if (gimp_item_get_visible (item))
{
/* Leave this up to subclasses */
}
else
{
GeglNode *input;
GeglNode *output;
input = gegl_node_get_input_proxy (item->node, "input");
output = gegl_node_get_output_proxy (item->node, "output");
gegl_node_connect_to (input, "output",
output, "input");
}
}
static GimpItem *
gimp_item_real_duplicate (GimpItem *item,
GType new_type)
{
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->image), 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,
gimp_item_get_width (item),
gimp_item_get_height (item),
new_name);
g_free (new_name);
g_object_unref (new_item->parasites);
new_item->parasites = gimp_parasite_list_copy (item->parasites);
new_item->visible = gimp_item_get_visible (item);
new_item->linked = gimp_item_get_linked (item);
return new_item;
}
static void
gimp_item_real_convert (GimpItem *item,
GimpImage *dest_image)
{
gimp_item_set_image (item, dest_image);
}
static gboolean
gimp_item_real_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc,
GError **error)
{
if (gimp_item_is_attached (item))
gimp_image_undo_push_item_rename (item->image, undo_desc, item);
gimp_object_set_name (GIMP_OBJECT (item), new_name);
return TRUE;
}
static void
gimp_item_real_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
gimp_item_set_offset (item,
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,
GimpProgress *progress)
{
if (item->width != new_width)
{
item->width = new_width;
g_object_notify (G_OBJECT (item), "width");
}
if (item->height != new_height)
{
item->height = new_height;
g_object_notify (G_OBJECT (item), "height");
}
gimp_item_set_offset (item, new_offset_x, new_offset_y);
}
static void
gimp_item_real_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
if (item->width != new_width)
{
item->width = new_width;
g_object_notify (G_OBJECT (item), "width");
}
if (item->height != new_height)
{
item->height = new_height;
g_object_notify (G_OBJECT (item), "height");
}
gimp_item_set_offset (item,
item->offset_x - offset_x,
item->offset_y - offset_y);
}
static GeglNode *
gimp_item_real_get_node (GimpItem *item)
{
item->node = gegl_node_new ();
return item->node;
}
static void
gimp_item_sync_offset_node (GimpItem *item)
{
if (item->offset_node)
gegl_node_set (item->offset_node,
"x", (gdouble) item->offset_x,
"y", (gdouble) item->offset_y,
NULL);
}
/**
* gimp_item_remove:
* @item: the #GimpItem to remove.
*
* This function sets the 'removed' flag on @item to #TRUE, and emits
* a 'removed' signal on the item.
*/
void
gimp_item_removed (GimpItem *item)
{
g_return_if_fail (GIMP_IS_ITEM (item));
item->removed = TRUE;
g_signal_emit (item, gimp_item_signals[REMOVED], 0);
}
/**
* gimp_item_is_removed:
* @item: the #GimpItem to check.
*
* Returns: %TRUE if the 'removed' flag is set for @item, %FALSE otherwise.
*/
gboolean
gimp_item_is_removed (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return item->removed;
}
/**
* gimp_item_configure:
* @item: The #GimpItem to configure.
* @image: The #GimpImage to which the item belongs.
* @offset_x: The X offset to assign the item.
* @offset_y: The Y offset to assign the item.
* @width: The width to assign the item.
* @height: The height to assign the item.
* @name: The name to assign the item.
*
* This function is used to configure a new item. First, if the item
* does not already have an ID, it is assigned the next available
* one, and then inserted into the Item Hash Table. Next, it is
* given basic item properties as specified by the arguments.
*/
void
gimp_item_configure (GimpItem *item,
GimpImage *image,
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 (image));
g_object_freeze_notify (G_OBJECT (item));
if (item->ID == 0)
{
do
{
item->ID = image->gimp->next_item_ID++;
if (image->gimp->next_item_ID == G_MAXINT)
image->gimp->next_item_ID = 1;
}
while (g_hash_table_lookup (image->gimp->item_table,
GINT_TO_POINTER (item->ID)));
g_hash_table_insert (image->gimp->item_table,
GINT_TO_POINTER (item->ID),
item);
gimp_item_set_image (item, image);
g_object_notify (G_OBJECT (item), "id");
}
if (item->width != width)
{
item->width = width;
g_object_notify (G_OBJECT (item), "width");
}
if (item->height != height)
{
item->height = height;
g_object_notify (G_OBJECT (item), "height");
}
gimp_item_set_offset (item, offset_x, offset_y);
if (name)
gimp_object_set_name (GIMP_OBJECT (item), name);
else
gimp_object_set_static_name (GIMP_OBJECT (item), _("Unnamed"));
g_object_thaw_notify (G_OBJECT (item));
}
/**
* gimp_item_is_attached:
* @item: The #GimpItem to check.
*
* Returns: %TRUE if the item is attached to an image, %FALSE otherwise.
*/
gboolean
gimp_item_is_attached (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return GIMP_ITEM_GET_CLASS (item)->is_attached (item);
}
/**
* gimp_item_duplicate:
* @item: The #GimpItem to duplicate.
* @new_type: The type to make the new item.
*
* Returns: the newly created item.
*/
GimpItem *
gimp_item_duplicate (GimpItem *item,
GType new_type)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (item->image), 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);
}
/**
* gimp_item_convert:
* @item: The #GimpItem to convert.
* @dest_image: The #GimpImage in which to place the converted item.
* @new_type: The type to convert the item to.
*
* Returns: the new item that results from the conversion.
*/
GimpItem *
gimp_item_convert (GimpItem *item,
GimpImage *dest_image,
GType new_type)
{
GimpItem *new_item;
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (item->image), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (dest_image), NULL);
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_ITEM), NULL);
new_item = gimp_item_duplicate (item, new_type);
if (new_item)
GIMP_ITEM_GET_CLASS (new_item)->convert (new_item, dest_image);
return new_item;
}
/**
* gimp_item_rename:
* @item: The #GimpItem to rename.
* @new_name: The new name to give the item.
* @error: Return location for error message.
*
* This function assigns a new name to the item, if the desired name is
* different from the name it already has, and pushes an entry onto the
* undo stack for the item's image. If @new_name is NULL or empty, the
* default name for the item's class is used. If the name is changed,
* the GimpObject::name-changed signal is emitted for the item.
*
* Returns: %TRUE if the @item could be renamed, %FALSE otherwise.
*/
gboolean
gimp_item_rename (GimpItem *item,
const gchar *new_name,
GError **error)
{
GimpItemClass *item_class;
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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))))
return item_class->rename (item, new_name, item_class->rename_desc, error);
return TRUE;
}
/**
* gimp_item_get_width:
* @item: The #GimpItem to check.
*
* Returns: The width of the item.
*/
gint
gimp_item_get_width (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), -1);
return item->width;
}
/**
* gimp_item_get_height:
* @item: The #GimpItem to check.
*
* Returns: The height of the item.
*/
gint
gimp_item_get_height (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), -1);
return item->height;
}
/**
* gimp_item_get_offset:
* @item: The #GimpItem to check.
* @offset_x: Return location for the item's X offset.
* @offset_y: Return location for the item's Y offset.
*
* Reveals the X and Y offsets of the item.
*/
void
gimp_item_get_offset (const GimpItem *item,
gint *offset_x,
gint *offset_y)
{
g_return_if_fail (GIMP_IS_ITEM (item));
if (offset_x) *offset_x = item->offset_x;
if (offset_y) *offset_y = item->offset_y;
}
void
gimp_item_set_offset (GimpItem *item,
gint offset_x,
gint offset_y)
{
g_return_if_fail (GIMP_IS_ITEM (item));
g_object_freeze_notify (G_OBJECT (item));
if (item->offset_x != offset_x)
{
item->offset_x = offset_x;
g_object_notify (G_OBJECT (item), "offset-x");
}
if (item->offset_y != offset_y)
{
item->offset_y = offset_y;
g_object_notify (G_OBJECT (item), "offset-y");
}
gimp_item_sync_offset_node (item);
g_object_thaw_notify (G_OBJECT (item));
}
gint
gimp_item_get_offset_x (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), 0);
return item->offset_x;
}
gint
gimp_item_get_offset_y (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), 0);
return item->offset_y;
}
/**
* gimp_item_translate:
* @item: The #GimpItem to move.
* @offset_x: Increment to the X offset of the item.
* @offset_y: Increment to the Y offset of the item.
* @push_undo: If #TRUE, create an entry in the image's undo stack
* for this action.
*
* Adds the specified increments to the X and Y offsets for the item.
*/
void
gimp_item_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
if (! gimp_item_is_attached (item))
push_undo = FALSE;
if (push_undo)
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_ITEM_DISPLACE,
item_class->translate_desc);
item_class->translate (item, offset_x, offset_y, push_undo);
if (push_undo)
gimp_image_undo_group_end (image);
}
/**
* 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 *image;
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);
image = gimp_item_get_image (item);
img_scale_w = ((gdouble) new_width /
(gdouble) gimp_image_get_width (image));
img_scale_h = ((gdouble) new_height /
(gdouble) gimp_image_get_height (image));
new_item_width = ROUND (img_scale_w * (gdouble) gimp_item_get_width (item));
new_item_height = ROUND (img_scale_h * (gdouble) gimp_item_get_height (item));
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,
GimpProgress *progress)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
if (new_width < 1 || new_height < 1)
return;
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
if (gimp_item_is_attached (item))
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_ITEM_SCALE,
item_class->scale_desc);
g_object_freeze_notify (G_OBJECT (item));
item_class->scale (item, new_width, new_height, new_offset_x, new_offset_y,
interpolation, progress);
g_object_thaw_notify (G_OBJECT (item));
if (gimp_item_is_attached (item))
gimp_image_undo_group_end (image);
}
/**
* 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:
* @progress:
*
* 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 #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,
GimpProgress *progress)
{
gint new_width, new_height;
gint new_offset_x, new_offset_y;
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), FALSE);
if (w_factor == 0.0 || h_factor == 0.0)
{
g_warning ("%s: requested width or height scale equals zero", G_STRFUNC);
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) gimp_item_get_width (item));
new_height = ROUND (h_factor * (gdouble) gimp_item_get_height (item));
if (new_width != 0 && new_height != 0)
{
gimp_item_scale (item,
new_width, new_height,
new_offset_x, new_offset_y,
interpolation, progress);
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:
* @progress:
* @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,
GimpProgress *progress,
gboolean local_origin)
{
gint new_offset_x, new_offset_y;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
if (new_width == 0 || new_height == 0)
{
g_warning ("%s: requested width or height equals zero", G_STRFUNC);
return;
}
if (local_origin)
{
new_offset_x = (item->offset_x +
((gimp_item_get_width (item) - new_width) / 2.0));
new_offset_y = (item->offset_y +
((gimp_item_get_height (item) - new_height) / 2.0));
}
else
{
new_offset_x = (gint) (((gdouble) new_width *
(gdouble) item->offset_x /
(gdouble) gimp_item_get_width (item)));
new_offset_y = (gint) (((gdouble) new_height *
(gdouble) item->offset_y /
(gdouble) gimp_item_get_height (item)));
}
gimp_item_scale (item,
new_width, new_height,
new_offset_x, new_offset_y,
interpolation, progress);
}
void
gimp_item_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (GIMP_IS_CONTEXT (context));
if (new_width < 1 || new_height < 1)
return;
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
if (gimp_item_is_attached (item))
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_ITEM_RESIZE,
item_class->resize_desc);
g_object_freeze_notify (G_OBJECT (item));
item_class->resize (item, context, new_width, new_height, offset_x, offset_y);
g_object_thaw_notify (G_OBJECT (item));
if (gimp_item_is_attached (item))
gimp_image_undo_group_end (image);
}
void
gimp_item_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (gimp_item_is_attached (item));
g_return_if_fail (GIMP_IS_CONTEXT (context));
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_TRANSFORM,
item_class->flip_desc);
g_object_freeze_notify (G_OBJECT (item));
item_class->flip (item, context, flip_type, axis, clip_result);
g_object_thaw_notify (G_OBJECT (item));
gimp_image_undo_group_end (image);
}
void
gimp_item_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (gimp_item_is_attached (item));
g_return_if_fail (GIMP_IS_CONTEXT (context));
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_TRANSFORM,
item_class->rotate_desc);
g_object_freeze_notify (G_OBJECT (item));
item_class->rotate (item, context, rotate_type, center_x, center_y,
clip_result);
g_object_thaw_notify (G_OBJECT (item));
gimp_image_undo_group_end (image);
}
void
gimp_item_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation,
gint recursion_level,
GimpTransformResize clip_result,
GimpProgress *progress)
{
GimpItemClass *item_class;
GimpImage *image;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (gimp_item_is_attached (item));
g_return_if_fail (GIMP_IS_CONTEXT (context));
g_return_if_fail (matrix != NULL);
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
item_class = GIMP_ITEM_GET_CLASS (item);
image = gimp_item_get_image (item);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_TRANSFORM,
item_class->transform_desc);
g_object_freeze_notify (G_OBJECT (item));
item_class->transform (item, context, matrix, direction, interpolation,
recursion_level, clip_result, progress);
g_object_thaw_notify (G_OBJECT (item));
gimp_image_undo_group_end (image);
}
gboolean
gimp_item_stroke (GimpItem *item,
GimpDrawable *drawable,
GimpContext *context,
GimpStrokeOptions *stroke_options,
gboolean use_default_values,
gboolean push_undo,
GimpProgress *progress,
GError **error)
{
GimpItemClass *item_class;
gboolean retval = FALSE;
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
g_return_val_if_fail (gimp_item_is_attached (item), FALSE);
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), FALSE);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), FALSE);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (GIMP_IS_STROKE_OPTIONS (stroke_options), FALSE);
g_return_val_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
item_class = GIMP_ITEM_GET_CLASS (item);
if (item_class->stroke)
{
GimpImage *image = gimp_item_get_image (item);
gimp_stroke_options_prepare (stroke_options, context, use_default_values);
if (push_undo)
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_PAINT,
item_class->stroke_desc);
retval = item_class->stroke (item, drawable, stroke_options, push_undo,
progress, error);
if (push_undo)
gimp_image_undo_group_end (image);
gimp_stroke_options_finish (stroke_options);
}
return retval;
}
GeglNode *
gimp_item_get_node (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
if (item->node)
return item->node;
return GIMP_ITEM_GET_CLASS (item)->get_node (item);
}
GeglNode *
gimp_item_get_offset_node (GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
if (! item->offset_node)
{
GeglNode *node = gimp_item_get_node (item);
item->offset_node =
gegl_node_new_child (node,
"operation", "gegl:translate",
"x", (gdouble) item->offset_x,
"y", (gdouble) item->offset_y,
NULL);
}
return item->offset_node;
}
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->image;
}
void
gimp_item_set_image (GimpItem *item,
GimpImage *image)
{
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (! gimp_item_is_attached (item));
g_return_if_fail (image == NULL || GIMP_IS_IMAGE (image));
if (image == NULL)
{
item->tattoo = 0;
}
else if (item->tattoo == 0 || item->image != image)
{
item->tattoo = gimp_image_get_new_tattoo (image);
}
item->image = image;
}
void
gimp_item_parasite_attach (GimpItem *item,
const GimpParasite *parasite)
{
GimpParasite copy;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (parasite != NULL);
/* make a temporary copy of the GimpParasite struct because
* gimp_parasite_shift_parent() changes it
*/
copy = *parasite;
if (gimp_item_is_attached (item))
{
/* only set the dirty bit manually if we can be saved and the new
* parasite differs from the current one and we aren't undoable
*/
if (gimp_parasite_is_undoable (&copy))
{
/* do a group in case we have attach_parent set */
gimp_image_undo_group_start (item->image,
GIMP_UNDO_GROUP_PARASITE_ATTACH,
_("Attach Parasite"));
gimp_image_undo_push_item_parasite (item->image, NULL, item, &copy);
}
else if (gimp_parasite_is_persistent (&copy) &&
! gimp_parasite_compare (&copy,
gimp_item_parasite_find
(item, gimp_parasite_name (&copy))))
{
gimp_image_undo_push_cantundo (item->image,
_("Attach Parasite to Item"));
}
}
gimp_parasite_list_add (item->parasites, &copy);
if (gimp_parasite_has_flag (&copy, GIMP_PARASITE_ATTACH_PARENT))
{
gimp_parasite_shift_parent (&copy);
gimp_image_parasite_attach (item->image, &copy);
}
else if (gimp_parasite_has_flag (&copy, GIMP_PARASITE_ATTACH_GRANDPARENT))
{
gimp_parasite_shift_parent (&copy);
gimp_parasite_shift_parent (&copy);
gimp_parasite_attach (item->image->gimp, &copy);
}
if (gimp_item_is_attached (item) &&
gimp_parasite_is_undoable (&copy))
{
gimp_image_undo_group_end (item->image);
}
}
void
gimp_item_parasite_detach (GimpItem *item,
const gchar *name)
{
const GimpParasite *parasite;
g_return_if_fail (GIMP_IS_ITEM (item));
g_return_if_fail (name != NULL);
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->image,
_("Remove Parasite from Item"),
item,
gimp_parasite_name (parasite));
}
else if (gimp_parasite_is_persistent (parasite))
{
gimp_image_undo_push_cantundo (item->image,
_("Remove Parasite from Item"));
}
gimp_parasite_list_remove (item->parasites, name);
}
const 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;
}
gboolean
gimp_item_get_visible (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return item->visible;
}
void
gimp_item_set_visible (GimpItem *item,
gboolean visible,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_ITEM (item));
if (gimp_item_get_visible (item) != visible)
{
if (push_undo && gimp_item_is_attached (item))
{
GimpImage *image = gimp_item_get_image (item);
if (image)
gimp_image_undo_push_item_visibility (image, NULL, item);
}
item->visible = visible ? TRUE : FALSE;
g_signal_emit (item, gimp_item_signals[VISIBILITY_CHANGED], 0);
g_object_notify (G_OBJECT (item), "visible");
}
}
void
gimp_item_set_linked (GimpItem *item,
gboolean linked,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_ITEM (item));
if (gimp_item_get_linked (item) != linked)
{
if (push_undo && gimp_item_is_attached (item))
{
GimpImage *image = gimp_item_get_image (item);
if (image)
gimp_image_undo_push_item_linked (image, NULL, item);
}
item->linked = linked ? TRUE : FALSE;
g_signal_emit (item, gimp_item_signals[LINKED_CHANGED], 0);
g_object_notify (G_OBJECT (item), "linked");
}
}
gboolean
gimp_item_get_linked (const GimpItem *item)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
return item->linked;
}
gboolean
gimp_item_is_in_set (GimpItem *item,
GimpItemSet set)
{
g_return_val_if_fail (GIMP_IS_ITEM (item), FALSE);
switch (set)
{
case GIMP_ITEM_SET_NONE:
return FALSE;
case GIMP_ITEM_SET_ALL:
return TRUE;
case GIMP_ITEM_SET_IMAGE_SIZED:
return (gimp_item_get_width (item) == gimp_image_get_width (item->image) &&
gimp_item_get_height (item) == gimp_image_get_height (item->image));
case GIMP_ITEM_SET_VISIBLE:
return gimp_item_get_visible (item);
case GIMP_ITEM_SET_LINKED:
return gimp_item_get_linked (item);
}
return FALSE;
}
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