mirror of https://github.com/GNOME/gimp.git
488 lines
14 KiB
C
488 lines
14 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 <http://www.gnu.org/licenses/>.
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*/
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/* This file contains the code necessary for generating on canvas
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* previews, either by connecting a function to process the pixels or
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* by connecting a specified GEGL operation to do the processing. It
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* keeps an undo buffer to allow direct modification of the pixel data
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* (so that it will show up in the projection) and it will restore the
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* source in case the mapping procedure was cancelled.
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*
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* To create a tool that uses this, see /tools/gimpimagemaptool.c for
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* the interface and /tools/gimpcolorbalancetool.c for an example of
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* using that interface.
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*
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* Note that when talking about on canvas preview, we are speaking
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* about non destructive image editing where the operation is previewd
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* before being applied.
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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 "libgimpbase/gimpbase.h"
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#include "core-types.h"
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#include "gegl/gimpapplicator.h"
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#include "gimpchannel.h"
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#include "gimpdrawable-filter.h"
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#include "gimpimage.h"
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#include "gimpimagemap.h"
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#include "gimpmarshal.h"
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#include "gimpprogress.h"
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enum
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{
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FLUSH,
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LAST_SIGNAL
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};
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struct _GimpImageMap
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{
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GimpObject parent_instance;
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GimpDrawable *drawable;
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gchar *undo_desc;
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GeglNode *operation;
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gchar *stock_id;
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GimpImageMapRegion region;
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gboolean filtering;
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GeglRectangle filter_area;
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GimpFilter *filter;
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GeglNode *translate;
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GeglNode *crop;
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GimpApplicator *applicator;
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};
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static void gimp_image_map_dispose (GObject *object);
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static void gimp_image_map_finalize (GObject *object);
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static gboolean gimp_image_map_add_filter (GimpImageMap *image_map);
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static gboolean gimp_image_map_remove_filter (GimpImageMap *image_map);
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static void gimp_image_map_update_drawable (GimpImageMap *image_map,
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const GeglRectangle *area);
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G_DEFINE_TYPE (GimpImageMap, gimp_image_map, GIMP_TYPE_OBJECT)
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#define parent_class gimp_image_map_parent_class
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static guint image_map_signals[LAST_SIGNAL] = { 0, };
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static void
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gimp_image_map_class_init (GimpImageMapClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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image_map_signals[FLUSH] =
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g_signal_new ("flush",
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G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_FIRST,
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G_STRUCT_OFFSET (GimpImageMapClass, flush),
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NULL, NULL,
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gimp_marshal_VOID__VOID,
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G_TYPE_NONE, 0);
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object_class->dispose = gimp_image_map_dispose;
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object_class->finalize = gimp_image_map_finalize;
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}
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static void
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gimp_image_map_init (GimpImageMap *image_map)
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{
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image_map->region = GIMP_IMAGE_MAP_REGION_SELECTION;
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}
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static void
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gimp_image_map_dispose (GObject *object)
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{
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GimpImageMap *image_map = GIMP_IMAGE_MAP (object);
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if (image_map->drawable)
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gimp_viewable_preview_thaw (GIMP_VIEWABLE (image_map->drawable));
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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gimp_image_map_finalize (GObject *object)
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{
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GimpImageMap *image_map = GIMP_IMAGE_MAP (object);
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if (image_map->undo_desc)
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{
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g_free (image_map->undo_desc);
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image_map->undo_desc = NULL;
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}
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if (image_map->operation)
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{
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g_object_unref (image_map->operation);
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image_map->operation = NULL;
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}
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if (image_map->stock_id)
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{
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g_free (image_map->stock_id);
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image_map->stock_id = NULL;
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}
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if (image_map->filter)
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{
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g_object_unref (image_map->filter);
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image_map->filter = NULL;
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}
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if (image_map->applicator)
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{
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g_object_unref (image_map->applicator);
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image_map->applicator = NULL;
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}
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if (image_map->drawable)
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{
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g_object_unref (image_map->drawable);
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image_map->drawable = NULL;
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}
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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GimpImageMap *
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gimp_image_map_new (GimpDrawable *drawable,
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const gchar *undo_desc,
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GeglNode *operation,
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const gchar *stock_id)
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{
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GimpImageMap *image_map;
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g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
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g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
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g_return_val_if_fail (GEGL_IS_NODE (operation), NULL);
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image_map = g_object_new (GIMP_TYPE_IMAGE_MAP, NULL);
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image_map->drawable = g_object_ref (drawable);
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image_map->undo_desc = g_strdup (undo_desc);
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image_map->operation = g_object_ref (operation);
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image_map->stock_id = g_strdup (stock_id);
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gimp_viewable_preview_freeze (GIMP_VIEWABLE (drawable));
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return image_map;
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}
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void
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gimp_image_map_set_region (GimpImageMap *image_map,
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GimpImageMapRegion region)
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{
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g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
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image_map->region = region;
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}
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void
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gimp_image_map_apply (GimpImageMap *image_map,
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const GeglRectangle *area)
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{
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GimpImage *image;
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GimpChannel *mask;
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GeglRectangle update_area;
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GimpComponentMask active_mask;
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g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
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/* Make sure the drawable is still valid */
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if (! gimp_item_is_attached (GIMP_ITEM (image_map->drawable)))
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{
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gimp_image_map_remove_filter (image_map);
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return;
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}
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/* The application should occur only within selection bounds */
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if (! gimp_item_mask_intersect (GIMP_ITEM (image_map->drawable),
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&image_map->filter_area.x,
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&image_map->filter_area.y,
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&image_map->filter_area.width,
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&image_map->filter_area.height))
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{
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gimp_image_map_remove_filter (image_map);
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return;
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}
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/* Only update "area" because only that has changed */
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if (! area)
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{
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update_area = image_map->filter_area;
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}
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else if (! gimp_rectangle_intersect (area->x,
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area->y,
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area->width,
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area->height,
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image_map->filter_area.x,
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image_map->filter_area.y,
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image_map->filter_area.width,
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image_map->filter_area.height,
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&update_area.x,
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&update_area.y,
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&update_area.width,
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&update_area.height))
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{
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/* Bail out, but don't remove the filter */
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return;
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}
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if (! image_map->filter)
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{
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GeglNode *filter_node;
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GeglNode *filter_output;
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GeglNode *input;
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image_map->filter = gimp_filter_new (image_map->undo_desc);
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gimp_viewable_set_stock_id (GIMP_VIEWABLE (image_map->filter),
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image_map->stock_id);
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filter_node = gimp_filter_get_node (image_map->filter);
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gegl_node_add_child (filter_node, image_map->operation);
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image_map->applicator =
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gimp_applicator_new (filter_node,
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gimp_drawable_get_linear (image_map->drawable));
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gimp_filter_set_applicator (image_map->filter,
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image_map->applicator);
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image_map->translate = gegl_node_new_child (filter_node,
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"operation", "gegl:translate",
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NULL);
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image_map->crop = gegl_node_new_child (filter_node,
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"operation", "gegl:crop",
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NULL);
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input = gegl_node_get_input_proxy (filter_node, "input");
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if (gegl_node_has_pad (image_map->operation, "input") &&
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gegl_node_has_pad (image_map->operation, "output"))
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{
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/* if there are input and output pads we probably have a
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* filter OP, connect it on both ends.
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*/
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gegl_node_link_many (input,
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image_map->translate,
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image_map->crop,
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image_map->operation,
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NULL);
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filter_output = image_map->operation;
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}
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else if (gegl_node_has_pad (image_map->operation, "output"))
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{
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/* if there is only an output pad we probably have a
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* source OP, blend its result on top of the original
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* pixels.
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*/
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GeglNode *over = gegl_node_new_child (filter_node,
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"operation", "gegl:over",
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NULL);
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gegl_node_link_many (input,
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image_map->translate,
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image_map->crop,
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over,
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NULL);
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gegl_node_connect_to (image_map->operation, "output",
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over, "aux");
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filter_output = over;
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}
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else
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{
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/* otherwise we just construct a silly nop pipleline
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*/
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gegl_node_link_many (input,
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image_map->translate,
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image_map->crop,
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NULL);
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filter_output = image_map->crop;
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}
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gegl_node_connect_to (filter_output, "output",
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filter_node, "aux");
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gimp_applicator_set_mode (image_map->applicator,
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GIMP_OPACITY_OPAQUE,
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GIMP_REPLACE_MODE);
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}
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if (image_map->region == GIMP_IMAGE_MAP_REGION_SELECTION)
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{
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gegl_node_set (image_map->translate,
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"x", (gdouble) -image_map->filter_area.x,
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"y", (gdouble) -image_map->filter_area.y,
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NULL);
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gegl_node_set (image_map->crop,
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"width", (gdouble) image_map->filter_area.width,
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"height", (gdouble) image_map->filter_area.height,
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NULL);
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gimp_applicator_set_apply_offset (image_map->applicator,
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image_map->filter_area.x,
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image_map->filter_area.y);
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}
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else
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{
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GimpItem *item = GIMP_ITEM (image_map->drawable);
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gdouble width = gimp_item_get_width (item);
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gdouble height = gimp_item_get_height (item);
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gegl_node_set (image_map->crop,
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"width", width,
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"height", height,
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NULL);
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}
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active_mask = gimp_drawable_get_active_mask (image_map->drawable);
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/* don't let the filter affect the drawable projection's alpha,
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* because it can't affect the drawable buffer's alpha either
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* when finally merged (see bug #699279)
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*/
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if (! gimp_drawable_has_alpha (image_map->drawable))
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active_mask &= ~GIMP_COMPONENT_ALPHA;
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gimp_applicator_set_affect (image_map->applicator, active_mask);
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image = gimp_item_get_image (GIMP_ITEM (image_map->drawable));
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mask = gimp_image_get_mask (image);
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if (gimp_channel_is_empty (mask))
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{
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gimp_applicator_set_mask_buffer (image_map->applicator, NULL);
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}
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else
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{
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GeglBuffer *mask_buffer;
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gint offset_x, offset_y;
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mask_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
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gimp_item_get_offset (GIMP_ITEM (image_map->drawable),
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&offset_x, &offset_y);
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gimp_applicator_set_mask_buffer (image_map->applicator, mask_buffer);
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gimp_applicator_set_mask_offset (image_map->applicator,
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-offset_x, -offset_y);
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}
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gimp_image_map_add_filter (image_map);
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gimp_image_map_update_drawable (image_map, &update_area);
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}
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void
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gimp_image_map_commit (GimpImageMap *image_map,
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GimpProgress *progress)
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{
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g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
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g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
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if (gimp_image_map_remove_filter (image_map))
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{
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gimp_drawable_merge_filter (image_map->drawable, image_map->filter,
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progress,
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image_map->undo_desc);
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g_signal_emit (image_map, image_map_signals[FLUSH], 0);
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}
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}
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void
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gimp_image_map_abort (GimpImageMap *image_map)
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{
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g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
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if (gimp_image_map_remove_filter (image_map))
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{
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gimp_image_map_update_drawable (image_map, &image_map->filter_area);
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}
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}
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/* private functions */
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static gboolean
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gimp_image_map_add_filter (GimpImageMap *image_map)
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{
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if (image_map->filter &&
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! gimp_drawable_has_filter (image_map->drawable, image_map->filter))
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{
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gimp_drawable_add_filter (image_map->drawable, image_map->filter);
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image_map->filtering = TRUE;
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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gimp_image_map_remove_filter (GimpImageMap *image_map)
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{
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if (image_map->filter &&
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gimp_drawable_has_filter (image_map->drawable, image_map->filter))
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{
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gimp_drawable_remove_filter (image_map->drawable, image_map->filter);
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if (image_map->filtering)
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{
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image_map->filtering = FALSE;
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return TRUE;
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}
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}
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return FALSE;
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}
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static void
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gimp_image_map_update_drawable (GimpImageMap *image_map,
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const GeglRectangle *area)
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{
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gimp_drawable_update (image_map->drawable,
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area->x,
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area->y,
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area->width,
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area->height);
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g_signal_emit (image_map, image_map_signals[FLUSH], 0);
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}
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