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gimp/app/core/gimpimagemap.c

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/* GIMP - The GNU 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 3 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, see <http://www.gnu.org/licenses/>.
*/
/* This file contains the code necessary for generating on canvas
* previews, either by connecting a function to process the pixels or
* by connecting a specified GEGL operation to do the processing. It
* keeps an undo buffer to allow direct modification of the pixel data
* (so that it will show up in the projection) and it will restore the
* source in case the mapping procedure was cancelled.
*
* To create a tool that uses this, see /tools/gimpimagemaptool.c for
* the interface and /tools/gimpcolorbalancetool.c for an example of
* using that interface.
*
* Note that when talking about on canvas preview, we are speaking
* about non destructive image editing where the operation is previewd
* before being applied.
*/
#include "config.h"
#include <gegl.h>
#include "core-types.h"
#include "gegl/gimpapplicator.h"
#include "gegl/gimp-gegl-utils.h"
#include "gimpdrawable.h"
#include "gimpdrawable-filter.h"
#include "gimpfilter.h"
#include "gimpimage.h"
#include "gimpimagemap.h"
#include "gimpmarshal.h"
#include "gimppickable.h"
#include "gimpviewable.h"
#include "gimpchannel.h"
#include "gimpprogress.h"
enum
{
FLUSH,
LAST_SIGNAL
};
struct _GimpImageMap
{
GimpObject parent_instance;
GimpDrawable *drawable;
gchar *undo_desc;
GeglNode *operation;
gchar *stock_id;
GimpFilter *filter;
GeglNode *translate;
GimpApplicator *applicator;
};
static void gimp_image_map_pickable_iface_init (GimpPickableInterface *iface);
static void gimp_image_map_dispose (GObject *object);
static void gimp_image_map_finalize (GObject *object);
static GimpImage * gimp_image_map_get_image (GimpPickable *pickable);
static const Babl * gimp_image_map_get_format (GimpPickable *pickable);
static const Babl * gimp_image_map_get_format_with_alpha
(GimpPickable *pickable);
static GeglBuffer * gimp_image_map_get_buffer (GimpPickable *pickable);
static gboolean gimp_image_map_get_pixel_at (GimpPickable *pickable,
gint x,
gint y,
const Babl *format,
gpointer pixel);
G_DEFINE_TYPE_WITH_CODE (GimpImageMap, gimp_image_map, GIMP_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GIMP_TYPE_PICKABLE,
gimp_image_map_pickable_iface_init))
#define parent_class gimp_image_map_parent_class
static guint image_map_signals[LAST_SIGNAL] = { 0 };
static void
gimp_image_map_class_init (GimpImageMapClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
image_map_signals[FLUSH] =
g_signal_new ("flush",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpImageMapClass, flush),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_image_map_dispose;
object_class->finalize = gimp_image_map_finalize;
}
static void
gimp_image_map_pickable_iface_init (GimpPickableInterface *iface)
{
iface->get_image = gimp_image_map_get_image;
iface->get_format = gimp_image_map_get_format;
iface->get_format_with_alpha = gimp_image_map_get_format_with_alpha;
iface->get_buffer = gimp_image_map_get_buffer;
iface->get_pixel_at = gimp_image_map_get_pixel_at;
}
static void
gimp_image_map_init (GimpImageMap *image_map)
{
}
static void
gimp_image_map_dispose (GObject *object)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (object);
if (image_map->drawable)
gimp_viewable_preview_thaw (GIMP_VIEWABLE (image_map->drawable));
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_image_map_finalize (GObject *object)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (object);
if (image_map->undo_desc)
{
g_free (image_map->undo_desc);
image_map->undo_desc = NULL;
}
if (image_map->operation)
{
g_object_unref (image_map->operation);
image_map->operation = NULL;
}
if (image_map->stock_id)
{
g_free (image_map->stock_id);
image_map->stock_id = NULL;
}
if (image_map->filter)
{
g_object_unref (image_map->filter);
image_map->filter = NULL;
}
if (image_map->applicator)
{
g_object_unref (image_map->applicator);
image_map->applicator = NULL;
}
if (image_map->drawable)
{
g_object_unref (image_map->drawable);
image_map->drawable = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GimpImage *
gimp_image_map_get_image (GimpPickable *pickable)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (pickable);
return gimp_pickable_get_image (GIMP_PICKABLE (image_map->drawable));
}
static const Babl *
gimp_image_map_get_format (GimpPickable *pickable)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (pickable);
return gimp_pickable_get_format (GIMP_PICKABLE (image_map->drawable));
}
static const Babl *
gimp_image_map_get_format_with_alpha (GimpPickable *pickable)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (pickable);
return gimp_pickable_get_format_with_alpha (GIMP_PICKABLE (image_map->drawable));
}
static GeglBuffer *
gimp_image_map_get_buffer (GimpPickable *pickable)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (pickable);
return gimp_pickable_get_buffer (GIMP_PICKABLE (image_map->drawable));
}
static gboolean
gimp_image_map_get_pixel_at (GimpPickable *pickable,
gint x,
gint y,
const Babl *format,
gpointer pixel)
{
GimpImageMap *image_map = GIMP_IMAGE_MAP (pickable);
return gimp_pickable_get_pixel_at (GIMP_PICKABLE (image_map->drawable),
x, y, format, pixel);
}
GimpImageMap *
gimp_image_map_new (GimpDrawable *drawable,
const gchar *undo_desc,
GeglNode *operation,
const gchar *stock_id)
{
GimpImageMap *image_map;
g_return_val_if_fail (GIMP_IS_DRAWABLE (drawable), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)), NULL);
g_return_val_if_fail (GEGL_IS_NODE (operation), NULL);
image_map = g_object_new (GIMP_TYPE_IMAGE_MAP, NULL);
image_map->drawable = g_object_ref (drawable);
image_map->undo_desc = g_strdup (undo_desc);
image_map->operation = g_object_ref (operation);
image_map->stock_id = g_strdup (stock_id);
gimp_viewable_preview_freeze (GIMP_VIEWABLE (drawable));
return image_map;
}
void
gimp_image_map_apply (GimpImageMap *image_map)
{
GimpImage *image;
GimpChannel *mask;
GeglRectangle rect;
g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
/* Make sure the drawable is still valid */
if (! gimp_item_is_attached (GIMP_ITEM (image_map->drawable)))
return;
/* The application should occur only within selection bounds */
if (! gimp_item_mask_intersect (GIMP_ITEM (image_map->drawable),
&rect.x, &rect.y,
&rect.width, &rect.height))
return;
if (! image_map->filter)
{
GeglNode *filter_node;
GeglNode *filter_output;
GeglNode *input;
image_map->filter = gimp_filter_new (image_map->undo_desc);
gimp_viewable_set_stock_id (GIMP_VIEWABLE (image_map->filter),
image_map->stock_id);
filter_node = gimp_filter_get_node (image_map->filter);
gegl_node_add_child (filter_node, image_map->operation);
image_map->applicator = gimp_applicator_new (filter_node);
gimp_filter_set_applicator (image_map->filter,
image_map->applicator);
image_map->translate = gegl_node_new_child (filter_node,
"operation", "gegl:translate",
NULL);
input = gegl_node_get_input_proxy (filter_node, "input");
if (gegl_node_has_pad (image_map->operation, "input") &&
gegl_node_has_pad (image_map->operation, "output"))
{
/* if there are input and output pads we probably have a
* filter OP, connect it on both ends.
*/
gegl_node_link_many (input,
image_map->translate,
image_map->operation,
NULL);
filter_output = image_map->operation;
}
else if (gegl_node_has_pad (image_map->operation, "output"))
{
/* if there is only an output pad we probably have a
* source OP, blend its result on top of the original
* pixels.
*/
GeglNode *over = gegl_node_new_child (filter_node,
"operation", "gegl:over",
NULL);
gegl_node_link_many (input,
image_map->translate,
over,
NULL);
gegl_node_connect_to (image_map->operation, "output",
over, "aux");
filter_output = over;
}
else
{
/* otherwise we just construct a silly nop pipleline
*/
gegl_node_link_many (input,
image_map->translate,
NULL);
filter_output = image_map->translate;
}
gegl_node_connect_to (filter_output, "output",
filter_node, "aux");
gimp_applicator_set_mode (image_map->applicator,
GIMP_OPACITY_OPAQUE,
GIMP_REPLACE_MODE);
}
if (! gimp_drawable_has_filter (image_map->drawable, image_map->filter))
gimp_drawable_add_filter (image_map->drawable, image_map->filter);
gegl_node_set (image_map->translate,
"x", (gdouble) -rect.x,
"y", (gdouble) -rect.y,
NULL);
gimp_applicator_set_apply_offset (image_map->applicator,
rect.x, rect.y);
gimp_applicator_set_affect (image_map->applicator,
gimp_drawable_get_active_mask (image_map->drawable));
image = gimp_item_get_image (GIMP_ITEM (image_map->drawable));
mask = gimp_image_get_mask (image);
if (gimp_channel_is_empty (mask))
{
gimp_applicator_set_mask_buffer (image_map->applicator, NULL);
}
else
{
GeglBuffer *mask_buffer;
gint offset_x, offset_y;
mask_buffer = gimp_drawable_get_buffer (GIMP_DRAWABLE (mask));
gimp_item_get_offset (GIMP_ITEM (image_map->drawable),
&offset_x, &offset_y);
gimp_applicator_set_mask_buffer (image_map->applicator, mask_buffer);
gimp_applicator_set_mask_offset (image_map->applicator,
offset_x, offset_y);
}
gimp_drawable_update (image_map->drawable,
rect.x, rect.y,
rect.width, rect.height);
g_signal_emit (image_map, image_map_signals[FLUSH], 0);
}
void
gimp_image_map_commit (GimpImageMap *image_map,
GimpProgress *progress)
{
g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
g_return_if_fail (progress == NULL || GIMP_IS_PROGRESS (progress));
if (gimp_drawable_has_filter (image_map->drawable, image_map->filter))
{
gimp_drawable_remove_filter (image_map->drawable, image_map->filter);
gimp_drawable_merge_filter (image_map->drawable, image_map->filter,
progress,
image_map->undo_desc);
g_signal_emit (image_map, image_map_signals[FLUSH], 0);
}
}
void
gimp_image_map_abort (GimpImageMap *image_map)
{
g_return_if_fail (GIMP_IS_IMAGE_MAP (image_map));
if (gimp_drawable_has_filter (image_map->drawable, image_map->filter))
{
GeglRectangle rect;
gimp_drawable_remove_filter (image_map->drawable, image_map->filter);
if (gimp_item_is_attached (GIMP_ITEM (image_map->drawable)) &&
gimp_item_mask_intersect (GIMP_ITEM (image_map->drawable),
&rect.x, &rect.y,
&rect.width, &rect.height))
{
gimp_drawable_update (image_map->drawable,
rect.x, rect.y,
rect.width, rect.height);
g_signal_emit (image_map, image_map_signals[FLUSH], 0);
}
}
}
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