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gimp/app/core/gimpimage-rotate.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 "gimp.h"
#include "gimpcontext.h"
#include "gimpguide.h"
#include "gimpimage.h"
#include "gimpimage-rotate.h"
#include "gimpimage-guides.h"
#include "gimpimage-sample-points.h"
#include "gimpimage-undo.h"
#include "gimpimage-undo-push.h"
#include "gimpitem.h"
#include "gimplist.h"
#include "gimpprogress.h"
static void gimp_image_rotate_item_offset (GimpImage *image,
GimpRotationType rotate_type,
GimpItem *item,
gint off_x,
gint off_y);
static void gimp_image_rotate_guides (GimpImage *image,
GimpRotationType rotate_type);
static void gimp_image_rotate_sample_points (GimpImage *image,
GimpRotationType rotate_type);
void
gimp_image_rotate (GimpImage *image,
GimpContext *context,
GimpRotationType rotate_type,
GimpProgress *progress)
{
GimpItem *item;
GList *list;
gdouble center_x;
gdouble center_y;
gdouble progress_max;
gdouble progress_current = 1.0;
gint new_image_width;
gint new_image_height;
gboolean size_changed;
g_return_if_fail (GIMP_IS_IMAGE (image));
g_return_if_fail (GIMP_IS_CONTEXT (context));
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
gimp_set_busy (image->gimp);
center_x = (gdouble) image->width / 2.0;
center_y = (gdouble) image->height / 2.0;
progress_max = (image->channels->num_children +
image->layers->num_children +
image->vectors->num_children +
1 /* selection */);
g_object_freeze_notify (G_OBJECT (image));
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_ROTATE, NULL);
/* Resize the image (if needed) */
switch (rotate_type)
{
case GIMP_ROTATE_90:
case GIMP_ROTATE_270:
new_image_width = image->height;
new_image_height = image->width;
size_changed = TRUE;
break;
case GIMP_ROTATE_180:
new_image_width = image->width;
new_image_height = image->height;
size_changed = FALSE;
break;
default:
g_assert_not_reached ();
return;
}
/* Rotate all channels */
for (list = GIMP_LIST (image->channels)->list;
list;
list = g_list_next (list))
{
item = (GimpItem *) list->data;
gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);
item->offset_x = 0;
item->offset_y = 0;
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* Rotate all vectors */
for (list = GIMP_LIST (image->vectors)->list;
list;
list = g_list_next (list))
{
item = (GimpItem *) list->data;
gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);
item->width = new_image_width;
item->height = new_image_height;
item->offset_x = 0;
item->offset_y = 0;
gimp_item_translate (item,
(new_image_width - image->width) / 2,
(new_image_height - image->height) / 2,
FALSE);
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* Don't forget the selection mask! */
gimp_item_rotate (GIMP_ITEM (gimp_image_get_mask (image)), context,
rotate_type, center_x, center_y, FALSE);
GIMP_ITEM (image->selection_mask)->offset_x = 0;
GIMP_ITEM (image->selection_mask)->offset_y = 0;
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
/* Rotate all layers */
for (list = GIMP_LIST (image->layers)->list;
list;
list = g_list_next (list))
{
gint off_x, off_y;
item = (GimpItem *) list->data;
gimp_item_offsets (item, &off_x, &off_y);
gimp_item_rotate (item, context, rotate_type, center_x, center_y, FALSE);
gimp_image_rotate_item_offset (image, rotate_type, item, off_x, off_y);
if (progress)
gimp_progress_set_value (progress, progress_current++ / progress_max);
}
/* Rotate all Guides */
gimp_image_rotate_guides (image, rotate_type);
/* Rotate all sample points */
gimp_image_rotate_sample_points (image, rotate_type);
/* Resize the image (if needed) */
if (size_changed)
{
gimp_image_undo_push_image_size (image, NULL);
g_object_set (image,
"width", new_image_width,
"height", new_image_height,
NULL);
if (image->xresolution != image->yresolution)
{
gdouble tmp;
gimp_image_undo_push_image_resolution (image, NULL);
tmp = image->xresolution;
image->yresolution = image->xresolution;
image->xresolution = tmp;
}
}
gimp_image_undo_group_end (image);
if (size_changed)
gimp_viewable_size_changed (GIMP_VIEWABLE (image));
g_object_thaw_notify (G_OBJECT (image));
gimp_unset_busy (image->gimp);
}
static void
gimp_image_rotate_item_offset (GimpImage *image,
GimpRotationType rotate_type,
GimpItem *item,
gint off_x,
gint off_y)
{
gint x = 0;
gint y = 0;
switch (rotate_type)
{
case GIMP_ROTATE_90:
x = image->height - off_y - gimp_item_width (item);
y = off_x;
break;
case GIMP_ROTATE_270:
x = off_y;
y = image->width - off_x - gimp_item_height (item);
break;
case GIMP_ROTATE_180:
return;
}
gimp_item_offsets (item, &off_x, &off_y);
x -= off_x;
y -= off_y;
if (x || y)
gimp_item_translate (item, x, y, FALSE);
}
static void
gimp_image_rotate_guides (GimpImage *image,
GimpRotationType rotate_type)
{
GList *list;
/* Rotate all Guides */
for (list = image->guides; list; list = g_list_next (list))
{
GimpGuide *guide = list->data;
switch (rotate_type)
{
case GIMP_ROTATE_90:
switch (guide->orientation)
{
case GIMP_ORIENTATION_HORIZONTAL:
gimp_image_undo_push_image_guide (image, NULL, guide);
guide->orientation = GIMP_ORIENTATION_VERTICAL;
guide->position = image->height - guide->position;
break;
case GIMP_ORIENTATION_VERTICAL:
gimp_image_undo_push_image_guide (image, NULL, guide);
guide->orientation = GIMP_ORIENTATION_HORIZONTAL;
break;
default:
break;
}
break;
case GIMP_ROTATE_180:
switch (guide->orientation)
{
case GIMP_ORIENTATION_HORIZONTAL:
gimp_image_move_guide (image, guide,
image->height - guide->position, TRUE);
break;
case GIMP_ORIENTATION_VERTICAL:
gimp_image_move_guide (image, guide,
image->width - guide->position, TRUE);
break;
default:
break;
}
break;
case GIMP_ROTATE_270:
switch (guide->orientation)
{
case GIMP_ORIENTATION_HORIZONTAL:
gimp_image_undo_push_image_guide (image, NULL, guide);
guide->orientation = GIMP_ORIENTATION_VERTICAL;
break;
case GIMP_ORIENTATION_VERTICAL:
gimp_image_undo_push_image_guide (image, NULL, guide);
guide->orientation = GIMP_ORIENTATION_HORIZONTAL;
guide->position = image->width - guide->position;
break;
default:
break;
}
break;
}
}
}
static void
gimp_image_rotate_sample_points (GimpImage *image,
GimpRotationType rotate_type)
{
GList *list;
/* Rotate all sample points */
for (list = image->sample_points; list; list = g_list_next (list))
{
GimpSamplePoint *sample_point = list->data;
gint old_x;
gint old_y;
old_x = sample_point->x;
old_y = sample_point->y;
switch (rotate_type)
{
case GIMP_ROTATE_90:
sample_point->x = old_y;
sample_point->y = image->height - old_x;
break;
case GIMP_ROTATE_180:
sample_point->x = image->height - old_x;
sample_point->y = image->width - old_y;
break;
case GIMP_ROTATE_270:
sample_point->x = image->width - old_y;
sample_point->y = old_x;
break;
}
}
}
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