mirror of https://github.com/GNOME/gimp.git
261 lines
8.4 KiB
C
261 lines
8.4 KiB
C
/* GIMP - The GNU 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 3 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, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "core-types.h"
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#include "gimp.h"
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#include "gimpcontainer.h"
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#include "gimpguide.h"
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#include "gimpgrouplayer.h"
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#include "gimpimage.h"
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#include "gimpimage-guides.h"
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#include "gimpimage-sample-points.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 "gimpobjectqueue.h"
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#include "gimpprogress.h"
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#include "gimpprojection.h"
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#include "gimpsamplepoint.h"
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#include "gimp-log.h"
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#include "gimp-intl.h"
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void
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gimp_image_scale (GimpImage *image,
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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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GimpProgress *progress)
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{
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GimpObjectQueue *queue;
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GimpItem *item;
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GList *list;
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gint old_width;
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gint old_height;
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gint offset_x;
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gint offset_y;
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gdouble img_scale_w = 1.0;
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gdouble img_scale_h = 1.0;
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g_return_if_fail (GIMP_IS_IMAGE (image));
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g_return_if_fail (new_width > 0 && new_height > 0);
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g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
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gimp_set_busy (image->gimp);
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queue = gimp_object_queue_new (progress);
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progress = GIMP_PROGRESS (queue);
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gimp_object_queue_push_container (queue, gimp_image_get_layers (image));
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gimp_object_queue_push (queue, gimp_image_get_mask (image));
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gimp_object_queue_push_container (queue, gimp_image_get_channels (image));
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gimp_object_queue_push_container (queue, gimp_image_get_vectors (image));
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g_object_freeze_notify (G_OBJECT (image));
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gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_SCALE,
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C_("undo-type", "Scale Image"));
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old_width = gimp_image_get_width (image);
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old_height = gimp_image_get_height (image);
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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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offset_x = (old_width - new_width) / 2;
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offset_y = (old_height - new_height) / 2;
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/* Push the image size to the stack */
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gimp_image_undo_push_image_size (image,
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NULL,
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offset_x,
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offset_y,
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new_width,
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new_height);
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/* Set the new width and height early, so below image item setters
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* (esp. guides and sample points) don't choke about moving stuff
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* out of the image
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*/
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g_object_set (image,
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"width", new_width,
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"height", new_height,
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NULL);
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/* Scale all layers, channels (including selection mask), and vectors */
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while ((item = gimp_object_queue_pop (queue)))
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{
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if (! gimp_item_scale_by_factors (item,
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img_scale_w, img_scale_h,
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interpolation_type, progress))
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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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g_return_if_fail (GIMP_IS_LAYER (item));
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gimp_image_remove_layer (image, GIMP_LAYER (item), TRUE, NULL);
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}
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}
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/* Scale all Guides */
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for (list = gimp_image_get_guides (image);
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list;
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list = g_list_next (list))
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{
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GimpGuide *guide = list->data;
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gint position = gimp_guide_get_position (guide);
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switch (gimp_guide_get_orientation (guide))
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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gimp_image_move_guide (image, guide,
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(position * new_height) / old_height,
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TRUE);
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break;
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case GIMP_ORIENTATION_VERTICAL:
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gimp_image_move_guide (image, guide,
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(position * new_width) / old_width,
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TRUE);
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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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/* Scale all sample points */
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for (list = gimp_image_get_sample_points (image);
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list;
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list = g_list_next (list))
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{
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GimpSamplePoint *sample_point = list->data;
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gint x;
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gint y;
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gimp_sample_point_get_position (sample_point, &x, &y);
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gimp_image_move_sample_point (image, sample_point,
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x * new_width / old_width,
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y * new_height / old_height,
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TRUE);
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}
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gimp_image_undo_group_end (image);
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g_object_unref (queue);
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gimp_image_size_changed_detailed (image,
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-offset_x,
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-offset_y,
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old_width,
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old_height);
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g_object_thaw_notify (G_OBJECT (image));
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gimp_unset_busy (image->gimp);
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}
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/**
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* gimp_image_scale_check:
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* @image: A #GimpImage.
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* @new_width: The new width.
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* @new_height: The new height.
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* @max_memsize: The maximum new memory size.
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* @new_memsize: The new memory size.
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*
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* Inventory the layer list in image and check that it may be
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* scaled to @new_height and @new_width without problems.
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*
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* Returns: #GIMP_IMAGE_SCALE_OK if scaling the image will shrink none
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* of its layers completely away, and the new image size
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* is smaller than @max_memsize.
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* #GIMP_IMAGE_SCALE_TOO_SMALL if scaling would remove some
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* existing layers.
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* #GIMP_IMAGE_SCALE_TOO_BIG if the new image size would
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* exceed the maximum specified in the preferences.
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**/
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GimpImageScaleCheckType
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gimp_image_scale_check (GimpImage *image,
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gint new_width,
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gint new_height,
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gint64 max_memsize,
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gint64 *new_memsize)
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{
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GList *all_layers;
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GList *list;
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gint64 current_size;
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gint64 undo_size;
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gint64 redo_size;
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gint64 new_size;
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g_return_val_if_fail (GIMP_IS_IMAGE (image), GIMP_IMAGE_SCALE_TOO_SMALL);
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g_return_val_if_fail (new_memsize != NULL, GIMP_IMAGE_SCALE_TOO_SMALL);
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current_size = gimp_object_get_memsize (GIMP_OBJECT (image), NULL);
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new_size = gimp_image_estimate_memsize (image,
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gimp_image_get_component_type (image),
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new_width, new_height);
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undo_size = gimp_object_get_memsize (GIMP_OBJECT (gimp_image_get_undo_stack (image)), NULL);
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redo_size = gimp_object_get_memsize (GIMP_OBJECT (gimp_image_get_redo_stack (image)), NULL);
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current_size -= undo_size + redo_size;
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new_size -= undo_size + redo_size;
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GIMP_LOG (IMAGE_SCALE,
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"old_size = %"G_GINT64_FORMAT" new_size = %"G_GINT64_FORMAT,
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current_size, new_size);
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*new_memsize = new_size;
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if (new_size > current_size && new_size > max_memsize)
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return GIMP_IMAGE_SCALE_TOO_BIG;
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all_layers = gimp_image_get_layer_list (image);
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for (list = all_layers; list; list = g_list_next (list))
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{
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GimpItem *item = list->data;
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/* group layers are updated automatically */
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if (gimp_viewable_get_children (GIMP_VIEWABLE (item)))
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continue;
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if (! gimp_item_check_scaling (item, new_width, new_height))
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{
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g_list_free (all_layers);
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return GIMP_IMAGE_SCALE_TOO_SMALL;
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}
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}
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g_list_free (all_layers);
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return GIMP_IMAGE_SCALE_OK;
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}
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