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gimp/app/core/gimpimage-merge.c

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/* The GIMP -- an 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <glib-object.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 "gimp.h"
#include "gimpimage.h"
#include "gimpimage-colorhash.h"
#include "gimpimage-merge.h"
#include "gimpimage-projection.h"
#include "gimpimage-undo.h"
#include "gimplayer.h"
#include "gimplayer-floating-sel.h"
#include "gimplayermask.h"
#include "gimplist.h"
#include "gimpmarshal.h"
#include "gimpparasitelist.h"
#include "gimpundostack.h"
#include "gimp-intl.h"
/* public functions */
GimpLayer *
gimp_image_merge_visible_layers (GimpImage *gimage,
GimpMergeType merge_type)
{
GList *list;
GSList *merge_list = NULL;
gboolean had_floating_sel = FALSE;
GimpLayer *layer = NULL;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
/* if there's a floating selection, anchor it */
if (gimp_image_floating_sel (gimage))
{
floating_sel_anchor (gimage->floating_sel);
had_floating_sel = TRUE;
}
for (list = GIMP_LIST (gimage->layers)->list;
list;
list = g_list_next (list))
{
layer = (GimpLayer *) list->data;
if (gimp_drawable_get_visible (GIMP_DRAWABLE (layer)))
merge_list = g_slist_append (merge_list, layer);
}
if (merge_list && merge_list->next)
{
gimp_set_busy (gimage->gimp);
layer = gimp_image_merge_layers (gimage, merge_list, merge_type,
_("Merge Visible Layers"));
g_slist_free (merge_list);
gimp_unset_busy (gimage->gimp);
return layer;
}
else
{
g_slist_free (merge_list);
/* If there was a floating selection, we have done something.
No need to warn the user. Return the active layer instead */
if (had_floating_sel)
return layer;
else
g_message (_("Not enough visible layers for a merge.\n"
"There must be at least two."));
return NULL;
}
}
GimpLayer *
gimp_image_flatten (GimpImage *gimage)
{
GList *list;
GSList *merge_list = NULL;
GimpLayer *layer;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
gimp_set_busy (gimage->gimp);
/* if there's a floating selection, anchor it */
if (gimp_image_floating_sel (gimage))
floating_sel_anchor (gimage->floating_sel);
for (list = GIMP_LIST (gimage->layers)->list;
list;
list = g_list_next (list))
{
layer = (GimpLayer *) list->data;
if (gimp_drawable_get_visible (GIMP_DRAWABLE (layer)))
merge_list = g_slist_append (merge_list, layer);
}
layer = gimp_image_merge_layers (gimage, merge_list, GIMP_FLATTEN_IMAGE,
_("Flatten Image"));
g_slist_free (merge_list);
gimp_image_alpha_changed (gimage);
gimp_unset_busy (gimage->gimp);
return layer;
}
GimpLayer *
gimp_image_merge_down (GimpImage *gimage,
GimpLayer *current_layer,
GimpMergeType merge_type)
{
GimpLayer *layer;
GList *list;
GList *layer_list;
GSList *merge_list;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
for (list = GIMP_LIST (gimage->layers)->list, layer_list = NULL;
list && !layer_list;
list = g_list_next (list))
{
layer = (GimpLayer *) list->data;
if (layer == current_layer)
break;
}
for (layer_list = g_list_next (list), merge_list = NULL;
layer_list && !merge_list;
layer_list = g_list_next (layer_list))
{
layer = (GimpLayer *) layer_list->data;
if (gimp_drawable_get_visible (GIMP_DRAWABLE (layer)))
merge_list = g_slist_append (NULL, layer);
}
if (merge_list)
{
merge_list = g_slist_prepend (merge_list, current_layer);
gimp_set_busy (gimage->gimp);
layer = gimp_image_merge_layers (gimage, merge_list, merge_type,
_("Merge Down"));
g_slist_free (merge_list);
gimp_unset_busy (gimage->gimp);
return layer;
}
else
{
g_message (_("There are not enough visible layers for a merge down."));
return NULL;
}
}
GimpLayer *
gimp_image_merge_layers (GimpImage *gimage,
GSList *merge_list,
GimpMergeType merge_type,
const gchar *undo_desc)
{
GList *list;
GSList *reverse_list = NULL;
PixelRegion src1PR, src2PR, maskPR;
PixelRegion *mask;
GimpLayer *merge_layer;
GimpLayer *layer;
GimpLayer *bottom_layer;
guchar bg[4] = {0, 0, 0, 0};
GimpImageType type;
gint count;
gint x1, y1, x2, y2;
gint x3, y3, x4, y4;
CombinationMode operation;
gint position;
gboolean active[MAX_CHANNELS] = { TRUE, TRUE, TRUE, TRUE };
gint off_x, off_y;
gchar *name;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
layer = NULL;
type = GIMP_RGBA_IMAGE;
x1 = y1 = 0;
x2 = y2 = 0;
bottom_layer = NULL;
/* Get the layer extents */
count = 0;
while (merge_list)
{
layer = (GimpLayer *) merge_list->data;
gimp_item_offsets (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_width (GIMP_ITEM (layer));
y2 = off_y + gimp_item_height (GIMP_ITEM (layer));
}
else
{
if (off_x < x1)
x1 = off_x;
if (off_y < y1)
y1 = off_y;
if ((off_x + gimp_item_width (GIMP_ITEM (layer))) > x2)
x2 = (off_x + gimp_item_width (GIMP_ITEM (layer)));
if ((off_y + gimp_item_height (GIMP_ITEM (layer))) > y2)
y2 = (off_y + gimp_item_height (GIMP_ITEM (layer)));
}
if (merge_type == GIMP_CLIP_TO_IMAGE)
{
x1 = CLAMP (x1, 0, gimage->width);
y1 = CLAMP (y1, 0, gimage->height);
x2 = CLAMP (x2, 0, gimage->width);
y2 = CLAMP (y2, 0, gimage->height);
}
break;
case GIMP_CLIP_TO_BOTTOM_LAYER:
if (merge_list->next == NULL)
{
x1 = off_x;
y1 = off_y;
x2 = off_x + gimp_item_width (GIMP_ITEM (layer));
y2 = off_y + gimp_item_height (GIMP_ITEM (layer));
}
break;
case GIMP_FLATTEN_IMAGE:
if (merge_list->next == NULL)
{
x1 = 0;
y1 = 0;
x2 = gimage->width;
y2 = gimage->height;
}
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. */
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_IMAGE_LAYERS_MERGE,
undo_desc);
name = g_strdup (gimp_object_get_name (GIMP_OBJECT (layer)));
if (merge_type == GIMP_FLATTEN_IMAGE ||
gimp_drawable_type (GIMP_DRAWABLE (layer)) == GIMP_INDEXED_IMAGE)
{
type = GIMP_IMAGE_TYPE_FROM_BASE_TYPE (gimp_image_base_type (gimage));
merge_layer = gimp_layer_new (gimage, (x2 - x1), (y2 - y1),
type,
gimp_object_get_name (GIMP_OBJECT (layer)),
GIMP_OPACITY_OPAQUE, GIMP_NORMAL_MODE);
if (!merge_layer)
{
g_warning ("%s: could not allocate merge layer.",
G_GNUC_PRETTY_FUNCTION);
return NULL;
}
GIMP_ITEM (merge_layer)->offset_x = x1;
GIMP_ITEM (merge_layer)->offset_y = y1;
/* get the background for compositing */
gimp_image_get_background (gimage, GIMP_DRAWABLE (merge_layer), bg);
/* init the pixel region */
pixel_region_init (&src1PR,
gimp_drawable_data (GIMP_DRAWABLE (merge_layer)),
0, 0,
gimage->width, gimage->height,
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 (gimage, (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_GNUC_PRETTY_FUNCTION);
return NULL;
}
GIMP_ITEM (merge_layer)->offset_x = x1;
GIMP_ITEM (merge_layer)->offset_y = y1;
/* Set the layer to transparent */
pixel_region_init (&src1PR,
gimp_drawable_data (GIMP_DRAWABLE (merge_layer)),
0, 0,
(x2 - x1), (y2 - y1),
TRUE);
/* set the region to 0's */
color_region (&src1PR, bg);
/* 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 = (GimpLayer *) reverse_list->data;
position =
gimp_container_num_children (gimage->layers) -
gimp_container_get_child_index (gimage->layers, 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)));
GIMP_ITEM (merge_layer)->parasites =
gimp_parasite_list_copy (GIMP_ITEM (bottom_layer)->parasites);
while (reverse_list)
{
GimpLayerModeEffects mode;
layer = (GimpLayer *) reverse_list->data;
/* determine what sort of operation is being attempted and
* if it's actually legal...
*/
operation =
gimp_image_get_combination_mode (gimp_drawable_type (GIMP_DRAWABLE (merge_layer)),
gimp_drawable_bytes (GIMP_DRAWABLE (layer)));
if (operation == -1)
{
g_warning ("%s: attempting to merge incompatible layers.",
G_GNUC_PRETTY_FUNCTION);
return NULL;
}
gimp_item_offsets (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_width (GIMP_ITEM (layer)), x1, x2);
y4 = CLAMP (off_y + gimp_item_height (GIMP_ITEM (layer)), y1, y2);
/* configure the pixel regions */
pixel_region_init (&src1PR,
gimp_drawable_data (GIMP_DRAWABLE (merge_layer)),
(x3 - x1), (y3 - y1), (x4 - x3), (y4 - y3),
TRUE);
pixel_region_init (&src2PR,
gimp_drawable_data (GIMP_DRAWABLE (layer)),
(x3 - off_x), (y3 - off_y),
(x4 - x3), (y4 - y3),
FALSE);
if (layer->mask && layer->mask->apply_mask)
{
pixel_region_init (&maskPR,
gimp_drawable_data (GIMP_DRAWABLE (layer->mask)),
(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 = layer->mode;
if (layer == bottom_layer && mode != GIMP_DISSOLVE_MODE)
mode = GIMP_NORMAL_MODE;
combine_regions (&src1PR, &src2PR, &src1PR, mask, NULL,
layer->opacity * 255.999,
mode,
active,
operation);
gimp_image_remove_layer (gimage, layer);
reverse_list = g_slist_next (reverse_list);
}
g_slist_free (reverse_list);
/* if the type is flatten, remove all the remaining layers */
if (merge_type == GIMP_FLATTEN_IMAGE)
{
list = GIMP_LIST (gimage->layers)->list;
while (list)
{
layer = (GimpLayer *) list->data;
list = g_list_next (list);
gimp_image_remove_layer (gimage, layer);
}
gimp_image_add_layer (gimage, merge_layer, position);
}
else
{
/* Add the layer to the gimage */
gimp_image_add_layer (gimage, merge_layer,
gimp_container_num_children (gimage->layers) - position + 1);
}
/* set the name after the original layers have been removed so we
* don't end up with #2 appended to the name
*/
gimp_object_set_name (GIMP_OBJECT (merge_layer), name);
g_free (name);
gimp_drawable_set_visible (GIMP_DRAWABLE (merge_layer), TRUE, TRUE);
/* End the merge undo group */
gimp_image_undo_group_end (gimage);
gimp_drawable_update (GIMP_DRAWABLE (merge_layer),
0, 0,
gimp_item_width (GIMP_ITEM (merge_layer)),
gimp_item_height (GIMP_ITEM (merge_layer)));
return merge_layer;
}
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