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gimp/app/core/gimpimage-merge.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/>.
*/
#include "config.h"
#include <gegl.h>
#include "libgimpcolor/gimpcolor.h"
#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "core-types.h"
#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile-manager.h"
#include "paint-funcs/paint-funcs.h"
#include "vectors/gimpvectors.h"
#include "gimp.h"
#include "gimpcontext.h"
#include "gimperror.h"
#include "gimpgrouplayer.h"
#include "gimpimage.h"
#include "gimpimage-colorhash.h"
#include "gimpimage-merge.h"
#include "gimpimage-undo.h"
#include "gimpitemstack.h"
#include "gimplayer-floating-sel.h"
#include "gimplayermask.h"
#include "gimpmarshal.h"
#include "gimpparasitelist.h"
#include "gimpundostack.h"
#include "gimp-intl.h"
static GimpLayer * gimp_image_merge_layers (GimpImage *image,
GimpContainer *container,
GSList *merge_list,
GimpContext *context,
GimpMergeType merge_type);
/* public functions */
GimpLayer *
gimp_image_merge_visible_layers (GimpImage *image,
GimpContext *context,
GimpMergeType merge_type,
gboolean merge_active_group,
gboolean discard_invisible)
{
GimpContainer *container;
GList *list;
GSList *merge_list = NULL;
GSList *invisible_list = NULL;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
if (merge_active_group)
{
GimpLayer *active_layer = gimp_image_get_active_layer (image);
/* if the active layer is the floating selection, get the
* underlying drawable, but only if it is a layer
*/
if (active_layer && gimp_layer_is_floating_sel (active_layer))
{
GimpDrawable *fs_drawable;
fs_drawable = gimp_layer_get_floating_sel_drawable (active_layer);
if (GIMP_IS_LAYER (fs_drawable))
active_layer = GIMP_LAYER (fs_drawable);
}
if (active_layer)
container = gimp_item_get_container (GIMP_ITEM (active_layer));
else
container = gimp_image_get_layers (image);
}
else
{
container = gimp_image_get_layers (image);
}
for (list = gimp_item_stack_get_item_iter (GIMP_ITEM_STACK (container));
list;
list = g_list_next (list))
{
GimpLayer *layer = list->data;
if (gimp_layer_is_floating_sel (layer))
continue;
if (gimp_item_get_visible (GIMP_ITEM (layer)))
{
merge_list = g_slist_append (merge_list, layer);
}
else if (discard_invisible)
{
invisible_list = g_slist_append (invisible_list, layer);
}
}
if (merge_list)
{
GimpLayer *layer;
gimp_set_busy (image->gimp);
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_IMAGE_LAYERS_MERGE,
C_("undo-type", "Merge Visible Layers"));
/* if there's a floating selection, anchor it */
if (gimp_image_get_floating_selection (image))
floating_sel_anchor (gimp_image_get_floating_selection (image));
layer = gimp_image_merge_layers (image,
container,
merge_list, context, merge_type);
g_slist_free (merge_list);
if (invisible_list)
{
GSList *list;
for (list = invisible_list; list; list = g_slist_next (list))
gimp_image_remove_layer (image, list->data, TRUE, NULL);
g_slist_free (invisible_list);
}
gimp_image_undo_group_end (image);
gimp_unset_busy (image->gimp);
return layer;
}
return gimp_image_get_active_layer (image);
}
GimpLayer *
gimp_image_flatten (GimpImage *image,
GimpContext *context)
{
GList *list;
GSList *merge_list = NULL;
GimpLayer *layer;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
gimp_set_busy (image->gimp);
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_IMAGE_LAYERS_MERGE,
C_("undo-type", "Flatten Image"));
/* if there's a floating selection, anchor it */
if (gimp_image_get_floating_selection (image))
floating_sel_anchor (gimp_image_get_floating_selection (image));
for (list = gimp_image_get_layer_iter (image);
list;
list = g_list_next (list))
{
layer = list->data;
if (gimp_item_get_visible (GIMP_ITEM (layer)))
merge_list = g_slist_append (merge_list, layer);
}
layer = gimp_image_merge_layers (image,
gimp_image_get_layers (image),
merge_list, context,
GIMP_FLATTEN_IMAGE);
g_slist_free (merge_list);
gimp_image_alpha_changed (image);
gimp_image_undo_group_end (image);
gimp_unset_busy (image->gimp);
return layer;
}
GimpLayer *
gimp_image_merge_down (GimpImage *image,
GimpLayer *current_layer,
GimpContext *context,
GimpMergeType merge_type,
GError **error)
{
GimpLayer *layer;
GList *list;
GList *layer_list = NULL;
GSList *merge_list = NULL;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_LAYER (current_layer), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (current_layer)), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
for (list = gimp_item_get_container_iter (GIMP_ITEM (current_layer));
list;
list = g_list_next (list))
{
layer = list->data;
if (layer == current_layer)
break;
}
for (layer_list = g_list_next (list);
layer_list;
layer_list = g_list_next (layer_list))
{
layer = layer_list->data;
if (gimp_item_get_visible (GIMP_ITEM (layer)))
{
if (gimp_viewable_get_children (GIMP_VIEWABLE (layer)))
{
g_set_error_literal (error, 0, 0,
_("Cannot merge down to a layer group."));
return NULL;
}
if (gimp_item_is_content_locked (GIMP_ITEM (layer)))
{
g_set_error_literal (error, 0, 0,
_("The layer to merge down to is locked."));
return NULL;
}
merge_list = g_slist_append (NULL, layer);
break;
}
}
if (! merge_list)
{
g_set_error_literal (error, 0, 0,
_("There is no visible layer to merge down to."));
return NULL;
}
merge_list = g_slist_prepend (merge_list, current_layer);
gimp_set_busy (image->gimp);
gimp_image_undo_group_start (image,
GIMP_UNDO_GROUP_IMAGE_LAYERS_MERGE,
C_("undo-type", "Merge Down"));
layer = gimp_image_merge_layers (image,
gimp_item_get_container (GIMP_ITEM (current_layer)),
merge_list, context, merge_type);
g_slist_free (merge_list);
gimp_image_undo_group_end (image);
gimp_unset_busy (image->gimp);
return layer;
}
GimpLayer *
gimp_image_merge_group_layer (GimpImage *image,
GimpGroupLayer *group)
{
GimpLayer *parent;
GimpLayer *layer;
gint index;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_GROUP_LAYER (group), NULL);
g_return_val_if_fail (gimp_item_is_attached (GIMP_ITEM (group)), NULL);
g_return_val_if_fail (gimp_item_get_image (GIMP_ITEM (group)) == image, NULL);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_LAYERS_MERGE,
C_("undo-type", "Merge Layer Group"));
parent = gimp_layer_get_parent (GIMP_LAYER (group));
index = gimp_item_get_index (GIMP_ITEM (group));
layer = GIMP_LAYER (gimp_item_duplicate (GIMP_ITEM (group),
GIMP_TYPE_LAYER));
gimp_object_set_name (GIMP_OBJECT (layer), gimp_object_get_name (group));
gimp_image_remove_layer (image, GIMP_LAYER (group), TRUE, NULL);
gimp_image_add_layer (image, layer, parent, index, TRUE);
gimp_image_undo_group_end (image);
return layer;
}
/* merging vectors */
GimpVectors *
gimp_image_merge_visible_vectors (GimpImage *image,
GError **error)
{
GList *list;
GList *merge_list = NULL;
GimpVectors *vectors;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
for (list = gimp_image_get_vectors_iter (image);
list;
list = g_list_next (list))
{
vectors = list->data;
if (gimp_item_get_visible (GIMP_ITEM (vectors)))
merge_list = g_list_prepend (merge_list, vectors);
}
merge_list = g_list_reverse (merge_list);
if (merge_list && merge_list->next)
{
GimpVectors *target_vectors;
gchar *name;
gint pos;
gimp_set_busy (image->gimp);
gimp_image_undo_group_start (image, GIMP_UNDO_GROUP_IMAGE_VECTORS_MERGE,
C_("undo-type", "Merge Visible Paths"));
vectors = GIMP_VECTORS (merge_list->data);
name = g_strdup (gimp_object_get_name (vectors));
pos = gimp_item_get_index (GIMP_ITEM (vectors));
target_vectors = GIMP_VECTORS (gimp_item_duplicate (GIMP_ITEM (vectors),
GIMP_TYPE_VECTORS));
gimp_image_remove_vectors (image, vectors, TRUE, NULL);
for (list = g_list_next (merge_list);
list;
list = g_list_next (list))
{
vectors = list->data;
gimp_vectors_add_strokes (vectors, target_vectors);
gimp_image_remove_vectors (image, vectors, TRUE, NULL);
}
gimp_object_take_name (GIMP_OBJECT (target_vectors), name);
g_list_free (merge_list);
/* FIXME tree */
gimp_image_add_vectors (image, target_vectors, NULL, pos, TRUE);
gimp_unset_busy (image->gimp);
gimp_image_undo_group_end (image);
return target_vectors;
}
else
{
g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED,
_("Not enough visible paths for a merge. "
"There must be at least two."));
return NULL;
}
}
/* private functions */
static CombinationMode
gimp_image_merge_layers_get_operation (GimpLayer *dest,
GimpLayer *src)
{
GimpImageType type = gimp_drawable_type (GIMP_DRAWABLE (dest));
gint bytes = gimp_drawable_bytes (GIMP_DRAWABLE (src));
return gimp_image_get_combination_mode (type, bytes);
}
static GimpLayer *
gimp_image_merge_layers (GimpImage *image,
GimpContainer *container,
GSList *merge_list,
GimpContext *context,
GimpMergeType merge_type)
{
GList *list;
GSList *reverse_list = NULL;
PixelRegion src1PR, src2PR, maskPR;
PixelRegion *mask;
GimpLayer *merge_layer;
GimpLayer *layer;
GimpLayer *bottom_layer;
GimpParasiteList *parasites;
gint count;
gint x1, y1, x2, y2;
gint off_x, off_y;
gint position;
gchar *name;
GimpLayer *parent;
g_return_val_if_fail (GIMP_IS_IMAGE (image), NULL);
g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
layer = NULL;
x1 = y1 = 0;
x2 = y2 = 0;
bottom_layer = NULL;
parent = gimp_layer_get_parent (merge_list->data);
/* Get the layer extents */
count = 0;
while (merge_list)
{
layer = merge_list->data;
gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
switch (merge_type)
{
case GIMP_EXPAND_AS_NECESSARY:
case GIMP_CLIP_TO_IMAGE:
if (! count)
{
x1 = off_x;
y1 = off_y;
x2 = off_x + gimp_item_get_width (GIMP_ITEM (layer));
y2 = off_y + gimp_item_get_height (GIMP_ITEM (layer));
}
else
{
if (off_x < x1)
x1 = off_x;
if (off_y < y1)
y1 = off_y;
if ((off_x + gimp_item_get_width (GIMP_ITEM (layer))) > x2)
x2 = (off_x + gimp_item_get_width (GIMP_ITEM (layer)));
if ((off_y + gimp_item_get_height (GIMP_ITEM (layer))) > y2)
y2 = (off_y + gimp_item_get_height (GIMP_ITEM (layer)));
}
if (merge_type == GIMP_CLIP_TO_IMAGE)
{
x1 = CLAMP (x1, 0, gimp_image_get_width (image));
y1 = CLAMP (y1, 0, gimp_image_get_height (image));
x2 = CLAMP (x2, 0, gimp_image_get_width (image));
y2 = CLAMP (y2, 0, gimp_image_get_height (image));
}
break;
case GIMP_CLIP_TO_BOTTOM_LAYER:
if (merge_list->next == NULL)
{
x1 = off_x;
y1 = off_y;
x2 = off_x + gimp_item_get_width (GIMP_ITEM (layer));
y2 = off_y + gimp_item_get_height (GIMP_ITEM (layer));
}
break;
case GIMP_FLATTEN_IMAGE:
if (merge_list->next == NULL)
{
x1 = 0;
y1 = 0;
x2 = gimp_image_get_width (image);
y2 = gimp_image_get_height (image);
}
break;
}
count ++;
reverse_list = g_slist_prepend (reverse_list, layer);
merge_list = g_slist_next (merge_list);
}
if ((x2 - x1) == 0 || (y2 - y1) == 0)
return NULL;
/* Start a merge undo group. */
name = g_strdup (gimp_object_get_name (layer));
if (merge_type == GIMP_FLATTEN_IMAGE ||
gimp_drawable_type (GIMP_DRAWABLE (layer)) == GIMP_INDEXED_IMAGE)
{
GimpImageType type;
guchar bg[4] = { 0, 0, 0, 0 };
type = GIMP_IMAGE_TYPE_FROM_BASE_TYPE (gimp_image_base_type (image));
merge_layer = gimp_layer_new (image, (x2 - x1), (y2 - y1),
type,
gimp_object_get_name (layer),
GIMP_OPACITY_OPAQUE, GIMP_NORMAL_MODE);
if (! merge_layer)
{
g_warning ("%s: could not allocate merge layer.", G_STRFUNC);
return NULL;
}
gimp_item_set_offset (GIMP_ITEM (merge_layer), x1, y1);
/* get the background for compositing */
gimp_image_get_background (image, context,
gimp_drawable_type (GIMP_DRAWABLE (merge_layer)),
bg);
/* init the pixel region */
pixel_region_init (&src1PR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (merge_layer)),
0, 0, (x2 - x1), (y2 - y1),
TRUE);
/* set the region to the background color */
color_region (&src1PR, bg);
position = 0;
}
else
{
/* The final merged layer inherits the name of the bottom most layer
* and the resulting layer has an alpha channel whether or not the
* original did. Opacity is set to 100% and the MODE is set to normal.
*/
merge_layer =
gimp_layer_new (image, (x2 - x1), (y2 - y1),
gimp_drawable_type_with_alpha (GIMP_DRAWABLE (layer)),
"merged layer",
GIMP_OPACITY_OPAQUE, GIMP_NORMAL_MODE);
if (!merge_layer)
{
g_warning ("%s: could not allocate merge layer", G_STRFUNC);
return NULL;
}
gimp_item_set_offset (GIMP_ITEM (merge_layer), x1, y1);
/* clear the layer */
pixel_region_init (&src1PR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (merge_layer)),
0, 0,
(x2 - x1), (y2 - y1),
TRUE);
clear_region (&src1PR);
/* Find the index in the layer list of the bottom layer--we need this
* in order to add the final, merged layer to the layer list correctly
*/
layer = reverse_list->data;
position =
gimp_container_get_n_children (container) -
gimp_container_get_child_index (container, GIMP_OBJECT (layer));
}
bottom_layer = layer;
/* Copy the tattoo and parasites of the bottom layer to the new layer */
gimp_item_set_tattoo (GIMP_ITEM (merge_layer),
gimp_item_get_tattoo (GIMP_ITEM (bottom_layer)));
parasites = gimp_item_get_parasites (GIMP_ITEM (bottom_layer));
parasites = gimp_parasite_list_copy (parasites);
gimp_item_set_parasites (GIMP_ITEM (merge_layer), parasites);
g_object_unref (parasites);
while (reverse_list)
{
CombinationMode operation;
GimpLayerModeEffects mode;
gint x3, y3, x4, y4;
gboolean active[MAX_CHANNELS] = { TRUE, TRUE, TRUE, TRUE };
layer = reverse_list->data;
/* determine what sort of operation is being attempted and
* if it's actually legal...
*/
operation = gimp_image_merge_layers_get_operation (merge_layer, layer);
if (operation == -1)
{
gimp_layer_add_alpha (layer);
/* try again ... */
operation = gimp_image_merge_layers_get_operation (merge_layer,
layer);
}
if (operation == -1)
{
g_warning ("%s: attempting to merge incompatible layers.", G_STRFUNC);
return NULL;
}
gimp_item_get_offset (GIMP_ITEM (layer), &off_x, &off_y);
x3 = CLAMP (off_x, x1, x2);
y3 = CLAMP (off_y, y1, y2);
x4 = CLAMP (off_x + gimp_item_get_width (GIMP_ITEM (layer)), x1, x2);
y4 = CLAMP (off_y + gimp_item_get_height (GIMP_ITEM (layer)), y1, y2);
/* configure the pixel regions */
pixel_region_init (&src1PR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (merge_layer)),
(x3 - x1), (y3 - y1), (x4 - x3), (y4 - y3),
TRUE);
pixel_region_init (&src2PR,
gimp_drawable_get_tiles (GIMP_DRAWABLE (layer)),
(x3 - off_x), (y3 - off_y),
(x4 - x3), (y4 - y3),
FALSE);
if (gimp_layer_get_mask (layer) &&
gimp_layer_mask_get_apply (layer->mask))
{
TileManager *tiles;
tiles = gimp_drawable_get_tiles (GIMP_DRAWABLE (layer->mask));
pixel_region_init (&maskPR, tiles,
(x3 - off_x), (y3 - off_y), (x4 - x3), (y4 - y3),
FALSE);
mask = &maskPR;
}
else
{
mask = NULL;
}
/* DISSOLVE_MODE is special since it is the only mode that does not
* work on the projection with the lower layer, but only locally on
* the layers alpha channel.
*/
mode = gimp_layer_get_mode (layer);
if (layer == bottom_layer && mode != GIMP_DISSOLVE_MODE)
mode = GIMP_NORMAL_MODE;
combine_regions (&src1PR, &src2PR, &src1PR, mask, NULL,
gimp_layer_get_opacity (layer) * 255.999,
mode,
active,
operation);
gimp_image_remove_layer (image, layer, TRUE, NULL);
reverse_list = g_slist_next (reverse_list);
}
g_slist_free (reverse_list);
gimp_object_take_name (GIMP_OBJECT (merge_layer), name);
gimp_item_set_visible (GIMP_ITEM (merge_layer), TRUE, FALSE);
/* if the type is flatten, remove all the remaining layers */
if (merge_type == GIMP_FLATTEN_IMAGE)
{
list = gimp_image_get_layer_iter (image);
while (list)
{
layer = list->data;
list = g_list_next (list);
gimp_image_remove_layer (image, layer, TRUE, NULL);
}
gimp_image_add_layer (image, merge_layer, parent,
position, TRUE);
}
else
{
/* Add the layer to the image */
gimp_image_add_layer (image, merge_layer, parent,
gimp_container_get_n_children (container) -
position + 1,
TRUE);
}
gimp_drawable_update (GIMP_DRAWABLE (merge_layer),
0, 0,
gimp_item_get_width (GIMP_ITEM (merge_layer)),
gimp_item_get_height (GIMP_ITEM (merge_layer)));
return merge_layer;
}
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