mirror of https://github.com/GNOME/gimp.git
231 lines
6.6 KiB
C
231 lines
6.6 KiB
C
/* 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 <glib-object.h>
|
|
|
|
#include "core-types.h"
|
|
|
|
#include "gimp.h"
|
|
#include "gimpimage.h"
|
|
#include "gimpimage-mask.h"
|
|
#include "gimpimage-projection.h"
|
|
#include "gimpimage-scale.h"
|
|
#include "gimpimage-undo.h"
|
|
#include "gimpimage-undo-push.h"
|
|
#include "gimplayer.h"
|
|
#include "gimplayer-floating-sel.h"
|
|
#include "gimplist.h"
|
|
|
|
#include "gimp-intl.h"
|
|
|
|
|
|
void
|
|
gimp_image_scale (GimpImage *gimage,
|
|
gint new_width,
|
|
gint new_height,
|
|
GimpInterpolationType interpolation_type,
|
|
GimpProgressFunc progress_func,
|
|
gpointer progress_data)
|
|
{
|
|
GimpLayer *floating_layer;
|
|
GimpItem *item;
|
|
GList *list;
|
|
GList *remove = NULL;
|
|
gint old_width;
|
|
gint old_height;
|
|
gdouble img_scale_w = 1.0;
|
|
gdouble img_scale_h = 1.0;
|
|
gint progress_max;
|
|
gint progress_current = 1;
|
|
|
|
g_return_if_fail (GIMP_IS_IMAGE (gimage));
|
|
g_return_if_fail (new_width > 0 && new_height > 0);
|
|
|
|
gimp_set_busy (gimage->gimp);
|
|
|
|
progress_max = (gimage->channels->num_children +
|
|
gimage->layers->num_children +
|
|
gimage->vectors->num_children +
|
|
1 /* selection */);
|
|
|
|
/* Get the floating layer if one exists */
|
|
floating_layer = gimp_image_floating_sel (gimage);
|
|
|
|
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
|
|
_("Scale Image"));
|
|
|
|
/* Relax the floating selection */
|
|
if (floating_layer)
|
|
floating_sel_relax (floating_layer, TRUE);
|
|
|
|
/* Push the image size to the stack */
|
|
gimp_image_undo_push_image_size (gimage, NULL);
|
|
|
|
/* Set the new width and height */
|
|
|
|
old_width = gimage->width;
|
|
old_height = gimage->height;
|
|
gimage->width = new_width;
|
|
gimage->height = new_height;
|
|
img_scale_w = (gdouble) new_width / (gdouble) old_width;
|
|
img_scale_h = (gdouble) new_height / (gdouble) old_height;
|
|
|
|
/* Scale all channels */
|
|
for (list = GIMP_LIST (gimage->channels)->list;
|
|
list;
|
|
list = g_list_next (list))
|
|
{
|
|
item = (GimpItem *) list->data;
|
|
|
|
gimp_item_scale (item, new_width, new_height, 0, 0, interpolation_type);
|
|
|
|
if (progress_func)
|
|
(* progress_func) (0, progress_max, progress_current++, progress_data);
|
|
}
|
|
|
|
/* Scale all vectors */
|
|
for (list = GIMP_LIST (gimage->vectors)->list;
|
|
list;
|
|
list = g_list_next (list))
|
|
{
|
|
item = (GimpItem *) list->data;
|
|
|
|
gimp_item_scale (item, new_width, new_height, 0, 0, interpolation_type);
|
|
|
|
if (progress_func)
|
|
(* progress_func) (0, progress_max, progress_current++, progress_data);
|
|
}
|
|
|
|
/* Don't forget the selection mask! */
|
|
gimp_item_scale (GIMP_ITEM (gimage->selection_mask), new_width, new_height,
|
|
0, 0, interpolation_type);
|
|
gimp_image_mask_invalidate (gimage);
|
|
|
|
if (progress_func)
|
|
(* progress_func) (0, progress_max, progress_current++, progress_data);
|
|
|
|
/* Scale all layers */
|
|
for (list = GIMP_LIST (gimage->layers)->list;
|
|
list;
|
|
list = g_list_next (list))
|
|
{
|
|
item = (GimpItem *) list->data;
|
|
|
|
if (! gimp_item_scale_by_factors (item, img_scale_w, img_scale_h,
|
|
interpolation_type))
|
|
{
|
|
/* Since 0 < img_scale_w, img_scale_h, failure due to one or more
|
|
* vanishing scaled layer dimensions. Implicit delete implemented
|
|
* here. Upstream warning implemented in resize_check_layer_scaling(),
|
|
* which offers the user the chance to bail out.
|
|
*/
|
|
remove = g_list_prepend (remove, item);
|
|
}
|
|
|
|
if (progress_func)
|
|
(* progress_func) (0, progress_max, progress_current++, progress_data);
|
|
}
|
|
|
|
/* We defer removing layers lost to scaling until now so as not to mix
|
|
* the operations of iterating over and removal from gimage->layers.
|
|
*/
|
|
remove = g_list_reverse (remove);
|
|
|
|
for (list = remove; list; list = g_list_next (list))
|
|
{
|
|
GimpLayer *layer = list->data;
|
|
|
|
gimp_image_remove_layer (gimage, layer);
|
|
}
|
|
|
|
g_list_free (remove);
|
|
|
|
/* Scale all Guides */
|
|
for (list = gimage->guides; list; list = g_list_next (list))
|
|
{
|
|
GimpGuide *guide = list->data;
|
|
|
|
switch (guide->orientation)
|
|
{
|
|
case GIMP_ORIENTATION_HORIZONTAL:
|
|
gimp_image_undo_push_image_guide (gimage, NULL, guide);
|
|
guide->position = (guide->position * new_height) / old_height;
|
|
break;
|
|
|
|
case GIMP_ORIENTATION_VERTICAL:
|
|
gimp_image_undo_push_image_guide (gimage, NULL, guide);
|
|
guide->position = (guide->position * new_width) / old_width;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Make sure the projection matches the gimage size */
|
|
gimp_image_projection_allocate (gimage);
|
|
|
|
/* Rigor the floating selection */
|
|
if (floating_layer)
|
|
floating_sel_rigor (floating_layer, TRUE);
|
|
|
|
gimp_image_undo_group_end (gimage);
|
|
|
|
gimp_viewable_size_changed (GIMP_VIEWABLE (gimage));
|
|
|
|
gimp_image_mask_changed (gimage);
|
|
|
|
gimp_unset_busy (gimage->gimp);
|
|
}
|
|
|
|
/**
|
|
* gimp_image_check_scaling:
|
|
* @gimage: A #GimpImage.
|
|
* @new_width: The new width.
|
|
* @new_height: The new height.
|
|
*
|
|
* Inventory the layer list in gimage and return #TRUE if, after
|
|
* scaling, they all retain positive x and y pixel dimensions.
|
|
*
|
|
* Return value: #TRUE if scaling the image will shrink none of it's
|
|
* layers completely away.
|
|
**/
|
|
gboolean
|
|
gimp_image_check_scaling (const GimpImage *gimage,
|
|
gint new_width,
|
|
gint new_height)
|
|
{
|
|
GList *list;
|
|
|
|
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
|
|
|
|
for (list = GIMP_LIST (gimage->layers)->list;
|
|
list;
|
|
list = g_list_next (list))
|
|
{
|
|
GimpItem *item = list->data;
|
|
|
|
if (! gimp_item_check_scaling (item, new_width, new_height))
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|