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3a8ef85b8c
2003-05-09 Michael Natterer <mitch@gimp.org> * app/core/gimpimage-crop.c (gimp_image_crop) * app/core/gimpimage-resize.c (gimp_image_resize) * app/core/gimpimage-scale.c (gimp_image_scale): don't #include "gimpchannel.h". Moved code around so they all do their stuff in the same order (improves readability when comparing the functions). Use GimpItem variables instead of GimpChannel or GimpLayer ones. Lots of cleanup.
235 lines
6.7 KiB
C
235 lines
6.7 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "core-types.h"
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#include "gimp.h"
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#include "gimpimage.h"
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#include "gimpimage-mask.h"
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#include "gimpimage-projection.h"
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#include "gimpimage-scale.h"
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#include "gimpimage-undo.h"
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#include "gimpimage-undo-push.h"
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#include "gimplayer.h"
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#include "gimplayer-floating-sel.h"
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#include "gimplist.h"
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#include "gimp-intl.h"
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void
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gimp_image_scale (GimpImage *gimage,
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gint new_width,
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gint new_height,
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GimpInterpolationType interpolation_type,
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GimpProgressFunc progress_func,
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gpointer progress_data)
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{
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GimpLayer *floating_layer;
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GimpItem *item;
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GList *list;
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GList *remove = NULL;
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gint old_width;
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gint old_height;
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gdouble img_scale_w = 1.0;
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gdouble img_scale_h = 1.0;
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gint num_channels;
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gint num_layers;
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gint num_vectors;
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gint progress_current = 1;
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g_return_if_fail (GIMP_IS_IMAGE (gimage));
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g_return_if_fail (new_width > 0 && new_height > 0);
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gimp_set_busy (gimage->gimp);
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num_channels = gimage->channels->num_children;
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num_layers = gimage->layers->num_children;
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num_vectors = gimage->vectors->num_children;
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/* Get the floating layer if one exists */
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floating_layer = gimp_image_floating_sel (gimage);
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gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_SCALE,
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_("Scale Image"));
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/* Relax the floating selection */
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if (floating_layer)
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floating_sel_relax (floating_layer, TRUE);
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/* Push the image size to the stack */
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gimp_image_undo_push_image_size (gimage, NULL);
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/* Set the new width and height */
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old_width = gimage->width;
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old_height = gimage->height;
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gimage->width = new_width;
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gimage->height = new_height;
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img_scale_w = (gdouble) new_width / (gdouble) old_width;
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img_scale_h = (gdouble) new_height / (gdouble) old_height;
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/* Scale all channels */
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for (list = GIMP_LIST (gimage->channels)->list;
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list;
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list = g_list_next (list))
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{
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item = (GimpItem *) list->data;
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gimp_item_scale (item, new_width, new_height, 0, 0, interpolation_type);
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if (progress_func)
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(* progress_func) (0, num_vectors + num_channels + num_layers,
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progress_current++,
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progress_data);
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}
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/* Scale all vectors */
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for (list = GIMP_LIST (gimage->vectors)->list;
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list;
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list = g_list_next (list))
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{
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item = (GimpItem *) list->data;
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gimp_item_scale (item, new_width, new_height, 0, 0, interpolation_type);
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if (progress_func)
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(* progress_func) (0, num_vectors + num_channels + num_layers,
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progress_current++,
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progress_data);
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}
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/* Don't forget the selection mask! */
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gimp_item_scale (GIMP_ITEM (gimage->selection_mask), new_width, new_height,
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0, 0, interpolation_type);
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gimp_image_mask_invalidate (gimage);
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/* Scale all layers */
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for (list = GIMP_LIST (gimage->layers)->list;
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list;
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list = g_list_next (list))
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{
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item = (GimpItem *) list->data;
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if (! gimp_item_scale_by_factors (item, img_scale_w, img_scale_h,
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interpolation_type))
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{
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/* Since 0 < img_scale_w, img_scale_h, failure due to one or more
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* vanishing scaled layer dimensions. Implicit delete implemented
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* here. Upstream warning implemented in resize_check_layer_scaling(),
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* which offers the user the chance to bail out.
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*/
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remove = g_list_prepend (remove, item);
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}
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if (progress_func)
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(* progress_func) (0, num_vectors + num_channels + num_layers,
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progress_current++,
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progress_data);
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}
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/* We defer removing layers lost to scaling until now so as not to mix
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* the operations of iterating over and removal from gimage->layers.
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*/
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remove = g_list_reverse (remove);
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for (list = remove; list; list = g_list_next (list))
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{
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GimpLayer *layer = list->data;
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gimp_image_remove_layer (gimage, layer);
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}
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g_list_free (remove);
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/* Scale all Guides */
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for (list = gimage->guides; list; list = g_list_next (list))
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{
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GimpGuide *guide = list->data;
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switch (guide->orientation)
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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gimp_image_undo_push_image_guide (gimage, NULL, guide);
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guide->position = (guide->position * new_height) / old_height;
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break;
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case GIMP_ORIENTATION_VERTICAL:
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gimp_image_undo_push_image_guide (gimage, NULL, guide);
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guide->position = (guide->position * new_width) / old_width;
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break;
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default:
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break;
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}
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}
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/* Make sure the projection matches the gimage size */
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gimp_image_projection_allocate (gimage);
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/* Rigor the floating selection */
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if (floating_layer)
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floating_sel_rigor (floating_layer, TRUE);
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gimp_image_undo_group_end (gimage);
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gimp_viewable_size_changed (GIMP_VIEWABLE (gimage));
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gimp_image_mask_changed (gimage);
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gimp_unset_busy (gimage->gimp);
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}
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/**
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* gimp_image_check_scaling:
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* @gimage: A #GimpImage.
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* @new_width: The new width.
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* @new_height: The new height.
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*
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* Inventory the layer list in gimage and return #TRUE if, after
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* scaling, they all retain positive x and y pixel dimensions.
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*
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* Return value: #TRUE if scaling the image will shrink none of it's
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* layers completely away.
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**/
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gboolean
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gimp_image_check_scaling (const GimpImage *gimage,
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gint new_width,
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gint new_height)
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{
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GList *list;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
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for (list = GIMP_LIST (gimage->layers)->list;
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list;
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list = g_list_next (list))
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{
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GimpItem *item = list->data;
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if (! gimp_item_check_scaling (item, new_width, new_height))
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return FALSE;
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}
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return TRUE;
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}
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