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gimp/app/core/gimpimage-scale.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 <glib-object.h>
#include "core-types.h"
#include "base/tile-manager.h"
#include "gimp.h"
#include "gimpimage.h"
#include "gimpimage-guides.h"
#include "gimpimage-sample-points.h"
#include "gimpimage-scale.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimplayer.h"
#include "gimplist.h"
#include "gimpprogress.h"
#include "gimp-intl.h"
void
gimp_image_scale (GimpImage *gimage,
gint new_width,
gint new_height,
GimpInterpolationType interpolation_type,
GimpProgress *progress)
{
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;
gdouble progress_max;
gdouble progress_current = 1.0;
g_return_if_fail (GIMP_IS_IMAGE (gimage));
g_return_if_fail (new_width > 0 && new_height > 0);
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
gimp_set_busy (gimage->gimp);
progress_max = (gimage->channels->num_children +
gimage->layers->num_children +
gimage->vectors->num_children +
1 /* selection */);
g_object_freeze_notify (G_OBJECT (gimage));
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
_("Scale Image"));
/* Push the image size to the stack */
gimp_image_undo_push_image_size (gimage, NULL);
old_width = gimage->width;
old_height = gimage->height;
img_scale_w = (gdouble) new_width / (gdouble) old_width;
img_scale_h = (gdouble) new_height / (gdouble) old_height;
/* Set the new width and height */
g_object_set (gimage,
"width", new_width,
"height", new_height,
NULL);
/* 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, NULL);
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* 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, NULL);
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* Don't forget the selection mask! */
gimp_item_scale (GIMP_ITEM (gimp_image_get_mask (gimage)),
new_width, new_height, 0, 0,
interpolation_type, NULL);
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
/* 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, NULL))
{
/* 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)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* 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;
}
}
/* Scale all sample points */
for (list = gimage->sample_points; list; list = g_list_next (list))
{
GimpSamplePoint *sample_point = list->data;
gimp_image_undo_push_image_sample_point (gimage, NULL, sample_point);
sample_point->x = sample_point->x * new_width / old_width;
sample_point->y = sample_point->y * new_height / old_height;
}
gimp_image_undo_group_end (gimage);
gimp_viewable_size_changed (GIMP_VIEWABLE (gimage));
g_object_thaw_notify (G_OBJECT (gimage));
gimp_unset_busy (gimage->gimp);
}
/**
* gimp_image_scale_check:
* @gimage: A #GimpImage.
* @new_width: The new width.
* @new_height: The new height.
* @max_memsize: The maximum new memory size.
* @new_memsize: The new memory size.
*
* Inventory the layer list in gimage and check that it may be
* scaled to @new_height and @new_width without problems.
*
* Return value: #GIMP_IMAGE_SCALE_OK if scaling the image will shrink none
* of its layers completely away, and the new image size
* is smaller than @max_memsize.
* #GIMP_IMAGE_SCALE_TOO_SMALL if scaling would remove some
* existing layers.
* #GIMP_IMAGE_SCALE_TOO_BIG if the new image size would
* exceed the maximum specified in the preferences.
**/
GimpImageScaleCheckType
gimp_image_scale_check (const GimpImage *gimage,
gint new_width,
gint new_height,
gint64 max_memsize,
gint64 *new_memsize)
{
GList *list;
gint64 current_size;
gint64 scalable_size;
gint64 undo_size;
gint64 redo_size;
gint64 fixed_size;
gint64 new_size;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), GIMP_IMAGE_SCALE_TOO_SMALL);
g_return_val_if_fail (new_memsize != NULL, GIMP_IMAGE_SCALE_TOO_SMALL);
current_size = gimp_object_get_memsize (GIMP_OBJECT (gimage), NULL);
/* the part of the image's memsize that scales linearly with the image */
scalable_size =
gimp_object_get_memsize (GIMP_OBJECT (gimage->layers), NULL) +
gimp_object_get_memsize (GIMP_OBJECT (gimage->channels), NULL) +
gimp_object_get_memsize (GIMP_OBJECT (gimage->selection_mask), NULL) +
gimp_object_get_memsize (GIMP_OBJECT (gimage->projection), NULL);
undo_size = gimp_object_get_memsize (GIMP_OBJECT (gimage->undo_stack), NULL);
redo_size = gimp_object_get_memsize (GIMP_OBJECT (gimage->redo_stack), NULL);
/* the fixed part of the image's memsize w/o any undo information */
fixed_size = current_size - undo_size - redo_size - scalable_size;
/* calculate the new size, which is: */
new_size = (fixed_size + /* the fixed part */
scalable_size * /* plus the part that scales... */
((gdouble) new_width / gimp_image_get_width (gimage)) *
((gdouble) new_height / gimp_image_get_height (gimage)));
*new_memsize = new_size;
if (new_size > current_size && new_size > max_memsize)
return GIMP_IMAGE_SCALE_TOO_BIG;
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 GIMP_IMAGE_SCALE_TOO_SMALL;
}
return GIMP_IMAGE_SCALE_OK;
}
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