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gimp/app/core/gimplayer.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 <stdlib.h>
#include <string.h>
#include <glib-object.h>
#include "libgimpmath/gimpmath.h"
#include "core-types.h"
#include "base/boundary.h"
#include "base/pixel-region.h"
#include "base/tile-manager.h"
#include "base/tile.h"
#include "paint-funcs/paint-funcs.h"
#include "gimp-utils.h"
#include "gimpcontext.h"
#include "gimpcontainer.h"
#include "gimpdrawable-convert.h"
#include "gimpdrawable-invert.h"
#include "gimpimage-undo-push.h"
#include "gimpimage-undo.h"
#include "gimpimage.h"
#include "gimplayer-floating-sel.h"
#include "gimplayer.h"
#include "gimplayermask.h"
#include "gimpmarshal.h"
#include "gimp-intl.h"
enum
{
OPACITY_CHANGED,
MODE_CHANGED,
PRESERVE_TRANS_CHANGED,
MASK_CHANGED,
LAST_SIGNAL
};
static void gimp_layer_class_init (GimpLayerClass *klass);
static void gimp_layer_init (GimpLayer *layer);
static void gimp_layer_dispose (GObject *object);
static void gimp_layer_finalize (GObject *object);
static void gimp_layer_name_changed (GimpObject *object);
static gint64 gimp_layer_get_memsize (GimpObject *object,
gint64 *gui_size);
static void gimp_layer_invalidate_preview (GimpViewable *viewable);
static gchar * gimp_layer_get_description (GimpViewable *viewable,
gchar **tooltip);
static void gimp_layer_removed (GimpItem *item);
static gboolean gimp_layer_is_attached (GimpItem *item);
static GimpItem * gimp_layer_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha);
static void gimp_layer_convert (GimpItem *item,
GimpImage *dest_image);
static gboolean gimp_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc);
static void gimp_layer_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo);
static void gimp_layer_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interp_type,
GimpProgress *progress);
static void gimp_layer_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y);
static void gimp_layer_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result);
static void gimp_layer_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result);
static void gimp_layer_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
gboolean supersample,
gint recursion_level,
gboolean clip_result,
GimpProgress *progress);
static void gimp_layer_invalidate_boundary (GimpDrawable *drawable);
static void gimp_layer_get_active_components (const GimpDrawable *drawable,
gboolean *active);
static void gimp_layer_set_tiles (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
TileManager *tiles,
GimpImageType type,
gint offset_x,
gint offset_y);
static void gimp_layer_transform_color (GimpImage *gimage,
PixelRegion *layerPR,
PixelRegion *bufPR,
GimpDrawable *drawable,
GimpImageBaseType src_type);
static void gimp_layer_layer_mask_update (GimpDrawable *layer_mask,
gint x,
gint y,
gint width,
gint height,
GimpLayer *layer);
static guint layer_signals[LAST_SIGNAL] = { 0 };
static GimpDrawableClass *parent_class = NULL;
GType
gimp_layer_get_type (void)
{
static GType layer_type = 0;
if (! layer_type)
{
static const GTypeInfo layer_info =
{
sizeof (GimpLayerClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gimp_layer_class_init,
NULL, /* class_finalize */
NULL, /* class_data */
sizeof (GimpLayer),
0, /* n_preallocs */
(GInstanceInitFunc) gimp_layer_init,
};
layer_type = g_type_register_static (GIMP_TYPE_DRAWABLE,
"GimpLayer",
&layer_info, 0);
}
return layer_type;
}
static void
gimp_layer_class_init (GimpLayerClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpObjectClass *gimp_object_class = GIMP_OBJECT_CLASS (klass);
GimpViewableClass *viewable_class = GIMP_VIEWABLE_CLASS (klass);
GimpItemClass *item_class = GIMP_ITEM_CLASS (klass);
GimpDrawableClass *drawable_class = GIMP_DRAWABLE_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
layer_signals[OPACITY_CHANGED] =
g_signal_new ("opacity-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpLayerClass, opacity_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
layer_signals[MODE_CHANGED] =
g_signal_new ("mode-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpLayerClass, mode_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
layer_signals[PRESERVE_TRANS_CHANGED] =
g_signal_new ("preserve-trans-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpLayerClass, preserve_trans_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
layer_signals[MASK_CHANGED] =
g_signal_new ("mask-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpLayerClass, mask_changed),
NULL, NULL,
gimp_marshal_VOID__VOID,
G_TYPE_NONE, 0);
object_class->dispose = gimp_layer_dispose;
object_class->finalize = gimp_layer_finalize;
gimp_object_class->name_changed = gimp_layer_name_changed;
gimp_object_class->get_memsize = gimp_layer_get_memsize;
viewable_class->default_stock_id = "gimp-layer";
viewable_class->invalidate_preview = gimp_layer_invalidate_preview;
viewable_class->get_description = gimp_layer_get_description;
item_class->removed = gimp_layer_removed;
item_class->is_attached = gimp_layer_is_attached;
item_class->duplicate = gimp_layer_duplicate;
item_class->convert = gimp_layer_convert;
item_class->rename = gimp_layer_rename;
item_class->translate = gimp_layer_translate;
item_class->scale = gimp_layer_scale;
item_class->resize = gimp_layer_resize;
item_class->flip = gimp_layer_flip;
item_class->rotate = gimp_layer_rotate;
item_class->transform = gimp_layer_transform;
item_class->default_name = _("Layer");
item_class->rename_desc = _("Rename Layer");
item_class->translate_desc = _("Move Layer");
item_class->scale_desc = _("Scale Layer");
item_class->resize_desc = _("Resize Layer");
item_class->flip_desc = _("Flip Layer");
item_class->rotate_desc = _("Rotate Layer");
item_class->transform_desc = _("Transform Layer");
drawable_class->invalidate_boundary = gimp_layer_invalidate_boundary;
drawable_class->get_active_components = gimp_layer_get_active_components;
drawable_class->set_tiles = gimp_layer_set_tiles;
klass->opacity_changed = NULL;
klass->mode_changed = NULL;
klass->preserve_trans_changed = NULL;
klass->mask_changed = NULL;
}
static void
gimp_layer_init (GimpLayer *layer)
{
layer->opacity = GIMP_OPACITY_OPAQUE;
layer->mode = GIMP_NORMAL_MODE;
layer->preserve_trans = FALSE;
layer->mask = NULL;
/* floating selection */
layer->fs.backing_store = NULL;
layer->fs.drawable = NULL;
layer->fs.initial = TRUE;
layer->fs.boundary_known = FALSE;
layer->fs.segs = NULL;
layer->fs.num_segs = 0;
}
static void
gimp_layer_dispose (GObject *object)
{
GimpLayer *layer = GIMP_LAYER (object);
if (layer->mask)
g_signal_handlers_disconnect_by_func (layer->mask,
gimp_layer_layer_mask_update,
layer);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gimp_layer_finalize (GObject *object)
{
GimpLayer *layer = GIMP_LAYER (object);
if (layer->mask)
{
g_object_unref (layer->mask);
layer->mask = NULL;
}
if (layer->fs.backing_store)
{
tile_manager_unref (layer->fs.backing_store);
layer->fs.backing_store = NULL;
}
if (layer->fs.segs)
{
g_free (layer->fs.segs);
layer->fs.segs = NULL;
layer->fs.num_segs = 0;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_layer_name_changed (GimpObject *object)
{
GimpLayer *layer = GIMP_LAYER (object);
if (GIMP_OBJECT_CLASS (parent_class)->name_changed)
GIMP_OBJECT_CLASS (parent_class)->name_changed (object);
if (layer->mask)
{
gchar *mask_name;
mask_name = g_strdup_printf (_("%s mask"), gimp_object_get_name (object));
gimp_object_set_name (GIMP_OBJECT (layer->mask), mask_name);
g_free (mask_name);
}
}
static gint64
gimp_layer_get_memsize (GimpObject *object,
gint64 *gui_size)
{
GimpLayer *layer = GIMP_LAYER (object);
gint64 memsize = 0;
if (layer->mask)
memsize += gimp_object_get_memsize (GIMP_OBJECT (layer->mask), gui_size);
if (layer->fs.backing_store)
*gui_size += tile_manager_get_memsize (layer->fs.backing_store, FALSE);
*gui_size += layer->fs.num_segs * sizeof (BoundSeg);
return memsize + GIMP_OBJECT_CLASS (parent_class)->get_memsize (object,
gui_size);
}
static void
gimp_layer_invalidate_preview (GimpViewable *viewable)
{
GimpLayer *layer = GIMP_LAYER (viewable);
if (GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview)
GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview (viewable);
if (gimp_layer_is_floating_sel (layer))
floating_sel_invalidate (layer);
}
static gchar *
gimp_layer_get_description (GimpViewable *viewable,
gchar **tooltip)
{
if (gimp_layer_is_floating_sel (GIMP_LAYER (viewable)))
{
if (tooltip)
*tooltip = NULL;
return g_strdup_printf (_("Floating Selection\n(%s)"),
gimp_object_get_name (GIMP_OBJECT (viewable)));
}
return GIMP_VIEWABLE_CLASS (parent_class)->get_description (viewable,
tooltip);
}
static void
gimp_layer_get_active_components (const GimpDrawable *drawable,
gboolean *active)
{
GimpLayer *layer = GIMP_LAYER (drawable);
GimpImage *gimage = gimp_item_get_image (GIMP_ITEM (drawable));
gint i;
/* first copy the gimage active channels */
for (i = 0; i < MAX_CHANNELS; i++)
active[i] = gimage->active[i];
if (gimp_drawable_has_alpha (drawable) && layer->preserve_trans)
active[gimp_drawable_bytes (drawable) - 1] = FALSE;
}
static void
gimp_layer_set_tiles (GimpDrawable *drawable,
gboolean push_undo,
const gchar *undo_desc,
TileManager *tiles,
GimpImageType type,
gint offset_x,
gint offset_y)
{
GimpLayer *layer = GIMP_LAYER (drawable);
if (gimp_layer_is_floating_sel (layer))
floating_sel_relax (layer, FALSE);
GIMP_DRAWABLE_CLASS (parent_class)->set_tiles (drawable,
push_undo, undo_desc,
tiles, type,
offset_x, offset_y);
if (gimp_layer_is_floating_sel (layer))
floating_sel_rigor (layer, FALSE);
}
static void
gimp_layer_removed (GimpItem *item)
{
GimpLayer *layer = GIMP_LAYER (item);
if (layer->mask)
gimp_item_removed (GIMP_ITEM (layer->mask));
if (GIMP_ITEM_CLASS (parent_class)->removed)
GIMP_ITEM_CLASS (parent_class)->removed (item);
}
static gboolean
gimp_layer_is_attached (GimpItem *item)
{
return (GIMP_IS_IMAGE (item->gimage) &&
gimp_container_have (item->gimage->layers, GIMP_OBJECT (item)));
}
static GimpItem *
gimp_layer_duplicate (GimpItem *item,
GType new_type,
gboolean add_alpha)
{
GimpLayer *layer;
GimpItem *new_item;
GimpLayer *new_layer;
g_return_val_if_fail (g_type_is_a (new_type, GIMP_TYPE_DRAWABLE), NULL);
new_item = GIMP_ITEM_CLASS (parent_class)->duplicate (item, new_type,
add_alpha);
if (! GIMP_IS_LAYER (new_item))
return new_item;
layer = GIMP_LAYER (item);
new_layer = GIMP_LAYER (new_item);
new_layer->mode = layer->mode;
new_layer->opacity = layer->opacity;
new_layer->preserve_trans = layer->preserve_trans;
/* duplicate the layer mask if necessary */
if (layer->mask)
{
GimpItem *dup = gimp_item_duplicate (GIMP_ITEM (layer->mask),
G_TYPE_FROM_INSTANCE (layer->mask),
FALSE);
gimp_layer_add_mask (new_layer, GIMP_LAYER_MASK (dup), FALSE);
}
return new_item;
}
static void
gimp_layer_convert (GimpItem *item,
GimpImage *dest_image)
{
GimpLayer *layer = GIMP_LAYER (item);
GimpDrawable *drawable = GIMP_DRAWABLE (item);
GimpImageBaseType old_base_type;
GimpImageBaseType new_base_type;
old_base_type = GIMP_IMAGE_TYPE_BASE_TYPE (gimp_drawable_type (drawable));
new_base_type = gimp_image_base_type (dest_image);
if (old_base_type != new_base_type)
{
TileManager *new_tiles;
GimpImageType new_type;
new_type = GIMP_IMAGE_TYPE_FROM_BASE_TYPE (new_base_type);
if (gimp_drawable_has_alpha (drawable))
new_type = GIMP_IMAGE_TYPE_WITH_ALPHA (new_type);
new_tiles = tile_manager_new (gimp_item_width (item),
gimp_item_height (item),
GIMP_IMAGE_TYPE_BYTES (new_type));
switch (new_base_type)
{
case GIMP_RGB:
gimp_drawable_convert_rgb (drawable,
new_tiles,
old_base_type);
break;
case GIMP_GRAY:
gimp_drawable_convert_grayscale (drawable,
new_tiles,
old_base_type);
break;
case GIMP_INDEXED:
{
PixelRegion layerPR;
PixelRegion newPR;
pixel_region_init (&layerPR, drawable->tiles,
0, 0,
gimp_item_width (item),
gimp_item_height (item),
FALSE);
pixel_region_init (&newPR, new_tiles,
0, 0,
gimp_item_width (item),
gimp_item_height (item),
TRUE);
gimp_layer_transform_color (gimp_item_get_image (item),
&newPR, &layerPR,
NULL,
old_base_type);
}
break;
}
gimp_drawable_set_tiles_full (drawable, FALSE, NULL,
new_tiles, new_type,
GIMP_ITEM (layer)->offset_x,
GIMP_ITEM (layer)->offset_y);
tile_manager_unref (new_tiles);
}
if (layer->mask)
gimp_item_set_image (GIMP_ITEM (layer->mask), dest_image);
GIMP_ITEM_CLASS (parent_class)->convert (item, dest_image);
}
static gboolean
gimp_layer_rename (GimpItem *item,
const gchar *new_name,
const gchar *undo_desc)
{
GimpLayer *layer = GIMP_LAYER (item);
GimpImage *gimage;
gboolean attached;
gboolean floating_sel;
gimage = gimp_item_get_image (item);
attached = gimp_item_is_attached (item);
floating_sel = gimp_layer_is_floating_sel (layer);
if (floating_sel)
{
if (GIMP_IS_CHANNEL (layer->fs.drawable))
return FALSE;
if (attached)
{
gimp_image_undo_group_start (gimage,
GIMP_UNDO_GROUP_ITEM_PROPERTIES,
undo_desc);
floating_sel_to_layer (layer);
}
}
GIMP_ITEM_CLASS (parent_class)->rename (item, new_name, undo_desc);
if (attached && floating_sel)
gimp_image_undo_group_end (gimage);
return TRUE;
}
static void
gimp_layer_translate (GimpItem *item,
gint offset_x,
gint offset_y,
gboolean push_undo)
{
GimpLayer *layer = GIMP_LAYER (item);
if (push_undo)
gimp_image_undo_push_item_displace (gimp_item_get_image (item), NULL, item);
/* update the old region */
gimp_drawable_update (GIMP_DRAWABLE (layer), 0, 0, item->width, item->height);
/* invalidate the selection boundary because of a layer modification */
gimp_drawable_invalidate_boundary (GIMP_DRAWABLE (layer));
if (gimp_layer_is_floating_sel (layer))
floating_sel_relax (layer, FALSE);
GIMP_ITEM_CLASS (parent_class)->translate (item, offset_x, offset_y,
push_undo);
if (gimp_layer_is_floating_sel (layer))
floating_sel_rigor (layer, FALSE);
/* update the new region */
gimp_drawable_update (GIMP_DRAWABLE (layer), 0, 0, item->width, item->height);
if (layer->mask)
{
GIMP_ITEM (layer->mask)->offset_x = item->offset_x;
GIMP_ITEM (layer->mask)->offset_y = item->offset_y;
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer->mask));
}
}
static void
gimp_layer_scale (GimpItem *item,
gint new_width,
gint new_height,
gint new_offset_x,
gint new_offset_y,
GimpInterpolationType interpolation_type,
GimpProgress *progress)
{
GimpLayer *layer = GIMP_LAYER (item);
GIMP_ITEM_CLASS (parent_class)->scale (item, new_width, new_height,
new_offset_x, new_offset_y,
interpolation_type, progress);
if (layer->mask)
gimp_item_scale (GIMP_ITEM (layer->mask),
new_width, new_height,
new_offset_x, new_offset_y,
interpolation_type, progress);
}
static void
gimp_layer_resize (GimpItem *item,
GimpContext *context,
gint new_width,
gint new_height,
gint offset_x,
gint offset_y)
{
GimpLayer *layer = GIMP_LAYER (item);
GIMP_ITEM_CLASS (parent_class)->resize (item, context, new_width, new_height,
offset_x, offset_y);
if (layer->mask)
gimp_item_resize (GIMP_ITEM (layer->mask), context,
new_width, new_height, offset_x, offset_y);
}
static void
gimp_layer_flip (GimpItem *item,
GimpContext *context,
GimpOrientationType flip_type,
gdouble axis,
gboolean clip_result)
{
GimpLayer *layer = GIMP_LAYER (item);
GIMP_ITEM_CLASS (parent_class)->flip (item, context, flip_type, axis,
clip_result);
if (layer->mask)
gimp_item_flip (GIMP_ITEM (layer->mask), context,
flip_type, axis, clip_result);
}
static void
gimp_layer_rotate (GimpItem *item,
GimpContext *context,
GimpRotationType rotate_type,
gdouble center_x,
gdouble center_y,
gboolean clip_result)
{
GimpLayer *layer = GIMP_LAYER (item);
GIMP_ITEM_CLASS (parent_class)->rotate (item, context,
rotate_type, center_x, center_y,
clip_result);
if (layer->mask)
gimp_item_rotate (GIMP_ITEM (layer->mask), context,
rotate_type, center_x, center_y, clip_result);
}
static void
gimp_layer_transform (GimpItem *item,
GimpContext *context,
const GimpMatrix3 *matrix,
GimpTransformDirection direction,
GimpInterpolationType interpolation_type,
gboolean supersample,
gint recursion_level,
gboolean clip_result,
GimpProgress *progress)
{
GimpLayer *layer = GIMP_LAYER (item);
GIMP_ITEM_CLASS (parent_class)->transform (item, context, matrix, direction,
interpolation_type,
supersample, recursion_level,
clip_result, progress);
if (layer->mask)
gimp_item_transform (GIMP_ITEM (layer->mask), context,
matrix, direction,
interpolation_type,
supersample, recursion_level,
clip_result, progress);
}
static void
gimp_layer_invalidate_boundary (GimpDrawable *drawable)
{
GimpLayer *layer = GIMP_LAYER (drawable);
GimpImage *gimage;
GimpChannel *mask;
if (! (gimage = gimp_item_get_image (GIMP_ITEM (layer))))
return;
/* Turn the current selection off */
gimp_image_selection_control (gimage, GIMP_SELECTION_OFF);
/* clear the affected region surrounding the layer */
gimp_image_selection_control (gimage, GIMP_SELECTION_LAYER_OFF);
/* get the selection mask channel */
mask = gimp_image_get_mask (gimage);
/* Only bother with the bounds if there is a selection */
if (! gimp_channel_is_empty (mask))
{
mask->bounds_known = FALSE;
mask->boundary_known = FALSE;
}
if (gimp_layer_is_floating_sel (layer))
floating_sel_invalidate (layer);
}
static void
gimp_layer_transform_color (GimpImage *gimage,
PixelRegion *layerPR,
PixelRegion *bufPR,
GimpDrawable *drawable,
GimpImageBaseType src_type)
{
gpointer pr;
for (pr = pixel_regions_register (2, layerPR, bufPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
const guchar *src = bufPR->data;
guchar *dest = layerPR->data;
gint h = layerPR->h;
while (h--)
{
const guchar *s = src;
guchar *d = dest;
gint i;
for (i = 0; i < layerPR->w; i++)
{
gimp_image_transform_color (gimage, drawable, d, src_type, s);
/* copy alpha channel */
d[layerPR->bytes - 1] = src[bufPR->bytes - 1];
s += bufPR->bytes;
d += layerPR->bytes;
}
src += bufPR->rowstride;
dest += layerPR->rowstride;
}
}
}
static void
gimp_layer_layer_mask_update (GimpDrawable *drawable,
gint x,
gint y,
gint width,
gint height,
GimpLayer *layer)
{
GimpLayerMask *layer_mask = GIMP_LAYER_MASK (drawable);
if (layer_mask->apply_mask || layer_mask->show_mask)
{
gimp_drawable_update (GIMP_DRAWABLE (layer),
x, y, width, height);
}
}
/* public functions */
GimpLayer *
gimp_layer_new (GimpImage *gimage,
gint width,
gint height,
GimpImageType type,
const gchar *name,
gdouble opacity,
GimpLayerModeEffects mode)
{
GimpLayer *layer;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (width > 0, NULL);
g_return_val_if_fail (height > 0, NULL);
layer = g_object_new (GIMP_TYPE_LAYER, NULL);
gimp_drawable_configure (GIMP_DRAWABLE (layer),
gimage,
0, 0, width, height,
type,
name);
opacity = CLAMP (opacity, GIMP_OPACITY_TRANSPARENT, GIMP_OPACITY_OPAQUE);
layer->opacity = opacity;
layer->mode = mode;
return layer;
}
/**
* gimp_layer_new_from_tiles:
* @tiles: The buffer to make the new layer from.
* @dest_gimage: The image the new layer will be added to.
* @type: The #GimpImageType of the new layer.
* @name: The new layer's name.
* @opacity: The new layer's opacity.
* @mode: The new layer's mode.
*
* Copies %tiles to a layer taking into consideration the
* possibility of transforming the contents to meet the requirements
* of the target image type
*
* Return value: The new layer.
**/
GimpLayer *
gimp_layer_new_from_tiles (TileManager *tiles,
GimpImage *dest_gimage,
GimpImageType type,
const gchar *name,
gdouble opacity,
GimpLayerModeEffects mode)
{
PixelRegion bufPR;
g_return_val_if_fail (tiles != NULL, NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (dest_gimage), NULL);
g_return_val_if_fail (name != NULL, NULL);
pixel_region_init (&bufPR, tiles,
0, 0,
tile_manager_width (tiles),
tile_manager_height (tiles),
FALSE);
return gimp_layer_new_from_region (&bufPR, dest_gimage, type,
name, opacity, mode);
}
/**
* gimp_layer_new_from_pixbuf:
* @pixbuf: The pixbuf to make the new layer from.
* @dest_gimage: The image the new layer will be added to.
* @type: The #GimpImageType of the new layer.
* @name: The new layer's name.
* @opacity: The new layer's opacity.
* @mode: The new layer's mode.
*
* Copies %pixbuf to a layer taking into consideration the
* possibility of transforming the contents to meet the requirements
* of the target image type
*
* Return value: The new layer.
**/
GimpLayer *
gimp_layer_new_from_pixbuf (GdkPixbuf *pixbuf,
GimpImage *dest_gimage,
GimpImageType type,
const gchar *name,
gdouble opacity,
GimpLayerModeEffects mode)
{
PixelRegion bufPR = { 0, };
g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (dest_gimage), NULL);
g_return_val_if_fail (name != NULL, NULL);
bufPR.data = gdk_pixbuf_get_pixels (pixbuf);
bufPR.rowstride = gdk_pixbuf_get_rowstride (pixbuf);
bufPR.x = 0;
bufPR.y = 0;
bufPR.w = gdk_pixbuf_get_width (pixbuf);
bufPR.h = gdk_pixbuf_get_height (pixbuf);
bufPR.bytes = gdk_pixbuf_get_n_channels (pixbuf);
return gimp_layer_new_from_region (&bufPR, dest_gimage, type,
name, opacity, mode);
}
/**
* gimp_layer_new_from_region:
* @region: A readable pixel region.
* @dest_gimage: The image the new layer will be added to.
* @type: The #GimpImageType of the new layer.
* @name: The new layer's name.
* @opacity: The new layer's opacity.
* @mode: The new layer's mode.
*
* Copies %region to a layer taking into consideration the
* possibility of transforming the contents to meet the requirements
* of the target image type
*
* Return value: The new layer.
**/
GimpLayer *
gimp_layer_new_from_region (PixelRegion *region,
GimpImage *dest_gimage,
GimpImageType type,
const gchar *name,
gdouble opacity,
GimpLayerModeEffects mode)
{
GimpLayer *new_layer;
PixelRegion layerPR;
GimpImageType src_type;
gint width;
gint height;
g_return_val_if_fail (region != NULL, NULL);
g_return_val_if_fail (GIMP_IS_IMAGE (dest_gimage), NULL);
g_return_val_if_fail (name != NULL, NULL);
width = region->w;
height = region->h;
switch (region->bytes)
{
case 1: src_type = GIMP_GRAY_IMAGE; break;
case 2: src_type = GIMP_GRAYA_IMAGE; break;
case 3: src_type = GIMP_RGB_IMAGE; break;
case 4: src_type = GIMP_RGBA_IMAGE; break;
default:
g_return_val_if_reached (NULL);
break;
}
new_layer = gimp_layer_new (dest_gimage, width, height, type, name,
opacity, mode);
if (! new_layer)
{
g_message ("gimp_layer_new_from_region: could not allocate new layer");
return NULL;
}
pixel_region_init (&layerPR, GIMP_DRAWABLE (new_layer)->tiles,
0, 0, width, height,
TRUE);
switch (type)
{
case GIMP_RGB_IMAGE:
switch (src_type)
{
case GIMP_RGB_IMAGE:
copy_region (region, &layerPR);
break;
default:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
}
break;
case GIMP_RGBA_IMAGE:
switch (src_type)
{
case GIMP_RGBA_IMAGE:
copy_region (region, &layerPR);
break;
case GIMP_RGB_IMAGE:
add_alpha_region (region, &layerPR);
break;
case GIMP_GRAYA_IMAGE:
gimp_layer_transform_color (dest_gimage, &layerPR, region,
GIMP_DRAWABLE (new_layer), GIMP_GRAY);
break;
default:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
}
break;
case GIMP_GRAY_IMAGE:
switch (src_type)
{
case GIMP_GRAY_IMAGE:
copy_region (region, &layerPR);
break;
default:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
}
break;
case GIMP_GRAYA_IMAGE:
switch (src_type)
{
case GIMP_RGBA_IMAGE:
gimp_layer_transform_color (dest_gimage, &layerPR, region,
GIMP_DRAWABLE (new_layer), GIMP_RGB);
break;
case GIMP_GRAYA_IMAGE:
copy_region (region, &layerPR);
break;
case GIMP_GRAY_IMAGE:
add_alpha_region (region, &layerPR);
break;
default:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
}
break;
case GIMP_INDEXED_IMAGE:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
case GIMP_INDEXEDA_IMAGE:
switch (src_type)
{
case GIMP_RGBA_IMAGE:
gimp_layer_transform_color (dest_gimage, &layerPR, region,
GIMP_DRAWABLE (new_layer), GIMP_RGB);
break;
case GIMP_GRAYA_IMAGE:
gimp_layer_transform_color (dest_gimage, &layerPR, region,
GIMP_DRAWABLE (new_layer), GIMP_GRAY);
break;
default:
g_warning ("%s: unhandled type conversion", G_STRFUNC);
break;
}
break;
}
return new_layer;
}
GimpLayerMask *
gimp_layer_add_mask (GimpLayer *layer,
GimpLayerMask *mask,
gboolean push_undo)
{
GimpImage *gimage;
g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
g_return_val_if_fail (GIMP_IS_LAYER_MASK (mask), NULL);
if (! gimp_item_is_attached (GIMP_ITEM (layer)))
push_undo = FALSE;
gimage = gimp_item_get_image (GIMP_ITEM (layer));
if (! gimage)
{
g_message (_("Cannot add layer mask to layer "
"which is not part of an image."));
return NULL;
}
if (layer->mask)
{
g_message (_("Unable to add a layer mask since "
"the layer already has one."));
return NULL;
}
if (! gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
{
g_message (_("Cannot add layer mask to a layer "
"with no alpha channel."));
return NULL;
}
if ((gimp_item_width (GIMP_ITEM (layer)) !=
gimp_item_width (GIMP_ITEM (mask))) ||
(gimp_item_height (GIMP_ITEM (layer)) !=
gimp_item_height (GIMP_ITEM (mask))))
{
g_message (_("Cannot add layer mask of different "
"dimensions than specified layer."));
return NULL;
}
if (push_undo)
gimp_image_undo_push_layer_mask_add (gimage, _("Add Layer Mask"),
layer, mask);
layer->mask = g_object_ref (mask);
gimp_item_sink (GIMP_ITEM (layer->mask));
gimp_layer_mask_set_layer (mask, layer);
if (mask->apply_mask || mask->show_mask)
{
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height);
}
g_signal_connect (mask, "update",
G_CALLBACK (gimp_layer_layer_mask_update),
layer);
g_signal_emit (layer, layer_signals[MASK_CHANGED], 0);
return layer->mask;
}
GimpLayerMask *
gimp_layer_create_mask (const GimpLayer *layer,
GimpAddMaskType add_mask_type)
{
GimpDrawable *drawable;
GimpItem *item;
PixelRegion srcPR;
PixelRegion destPR;
GimpLayerMask *mask;
GimpImage *gimage;
gchar *mask_name;
GimpRGB black = { 0.0, 0.0, 0.0, GIMP_OPACITY_OPAQUE };
g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
drawable = GIMP_DRAWABLE (layer);
item = GIMP_ITEM (layer);
gimage = gimp_item_get_image (item);
mask_name = g_strdup_printf (_("%s mask"),
gimp_object_get_name (GIMP_OBJECT (layer)));
mask = gimp_layer_mask_new (gimage,
item->width,
item->height,
mask_name, &black);
g_free (mask_name);
switch (add_mask_type)
{
case GIMP_ADD_WHITE_MASK:
gimp_channel_all (GIMP_CHANNEL (mask), FALSE);
return mask;
case GIMP_ADD_BLACK_MASK:
gimp_channel_clear (GIMP_CHANNEL (mask), NULL, FALSE);
return mask;
default:
break;
}
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
0, 0,
GIMP_ITEM (mask)->width,
GIMP_ITEM (mask)->height,
TRUE);
switch (add_mask_type)
{
case GIMP_ADD_WHITE_MASK:
case GIMP_ADD_BLACK_MASK:
break;
case GIMP_ADD_ALPHA_MASK:
case GIMP_ADD_ALPHA_TRANSFER_MASK:
if (gimp_drawable_has_alpha (drawable))
{
pixel_region_init (&srcPR, drawable->tiles,
0, 0,
item->width, item->height,
FALSE);
extract_alpha_region (&srcPR, NULL, &destPR);
if (add_mask_type == GIMP_ADD_ALPHA_TRANSFER_MASK)
{
void *pr;
gint w, h;
guchar *alpha_ptr;
gimp_drawable_push_undo (GIMP_DRAWABLE (layer),
_("Transfer Alpha to Mask"),
0, 0,
item->width,
item->height,
NULL, FALSE);
pixel_region_init (&srcPR, drawable->tiles,
0, 0,
item->width, item->height,
TRUE);
for (pr = pixel_regions_register (1, &srcPR);
pr != NULL;
pr = pixel_regions_process (pr))
{
h = srcPR.h;
while (h--)
{
w = srcPR.w;
alpha_ptr = (srcPR.data + h * srcPR.rowstride +
srcPR.bytes - 1);
while (w--)
{
*alpha_ptr = OPAQUE_OPACITY;
alpha_ptr += srcPR.bytes;
}
}
}
}
}
break;
case GIMP_ADD_SELECTION_MASK:
{
GimpChannel *selection;
gboolean selection_empty;
gint copy_x, copy_y;
gint copy_width, copy_height;
selection = gimp_image_get_mask (gimage);
selection_empty = gimp_channel_is_empty (selection);
gimp_rectangle_intersect (0, 0, gimage->width, gimage->height,
item->offset_x, item->offset_y,
item->width, item->height,
&copy_x, &copy_y, &copy_width, &copy_height);
if (copy_width < item->width || copy_height < item->height ||
selection_empty)
gimp_channel_clear (GIMP_CHANNEL (mask), NULL, FALSE);
if ((copy_width || copy_height) && ! selection_empty)
{
pixel_region_init (&srcPR, GIMP_DRAWABLE (selection)->tiles,
copy_x, copy_y,
copy_width, copy_height,
FALSE);
pixel_region_init (&destPR, GIMP_DRAWABLE (mask)->tiles,
copy_x - item->offset_x, copy_y - item->offset_y,
copy_width, copy_height,
TRUE);
copy_region (&srcPR, &destPR);
GIMP_CHANNEL (mask)->bounds_known = FALSE;
}
}
break;
case GIMP_ADD_COPY_MASK:
{
TileManager *copy_tiles = NULL;
GimpImageType layer_type;
layer_type = drawable->type;
if (GIMP_IMAGE_TYPE_BASE_TYPE (layer_type) != GIMP_GRAY)
{
GimpImageType copy_type;
copy_type = (GIMP_IMAGE_TYPE_HAS_ALPHA (layer_type) ?
GIMP_GRAYA_IMAGE : GIMP_GRAY_IMAGE);
copy_tiles = tile_manager_new (item->width,
item->height,
GIMP_IMAGE_TYPE_BYTES (copy_type));
gimp_drawable_convert_grayscale (drawable,
copy_tiles,
GIMP_IMAGE_TYPE_BASE_TYPE (layer_type));
pixel_region_init (&srcPR, copy_tiles,
0, 0,
item->width,
item->height,
FALSE);
}
else
{
pixel_region_init (&srcPR, drawable->tiles,
0, 0,
item->width,
item->height,
FALSE);
}
if (gimp_drawable_has_alpha (drawable))
{
guchar black_uchar[] = { 0, 0, 0, 0 };
flatten_region (&srcPR, &destPR, black_uchar);
}
else
{
copy_region (&srcPR, &destPR);
}
if (copy_tiles)
tile_manager_unref (copy_tiles);
}
GIMP_CHANNEL (mask)->bounds_known = FALSE;
break;
}
return mask;
}
void
gimp_layer_apply_mask (GimpLayer *layer,
GimpMaskApplyMode mode,
gboolean push_undo)
{
GimpItem *item;
GimpImage *gimage;
PixelRegion srcPR, maskPR;
gboolean view_changed = FALSE;
g_return_if_fail (GIMP_IS_LAYER (layer));
if (! layer->mask)
return;
/* this operation can only be done to layers with an alpha channel */
if (! gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
return;
item = GIMP_ITEM (layer);
gimage = gimp_item_get_image (item);
if (! gimage)
return;
if (push_undo)
{
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_LAYER_APPLY_MASK,
(mode == GIMP_MASK_APPLY) ?
_("Apply Layer Mask") :
_("Delete Layer Mask"));
gimp_image_undo_push_layer_mask_remove (gimage, NULL, layer, layer->mask);
}
/* check if applying the mask changes the projection */
if (layer->mask->show_mask ||
(mode == GIMP_MASK_APPLY && ! layer->mask->apply_mask) ||
(mode == GIMP_MASK_DISCARD && layer->mask->apply_mask))
{
view_changed = TRUE;
}
if (mode == GIMP_MASK_APPLY)
{
if (push_undo)
gimp_drawable_push_undo (GIMP_DRAWABLE (layer), NULL,
0, 0,
item->width,
item->height,
NULL, FALSE);
/* Combine the current layer's alpha channel and the mask */
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
item->width,
item->height,
TRUE);
pixel_region_init (&maskPR, GIMP_DRAWABLE (layer->mask)->tiles,
0, 0,
item->width,
item->height,
FALSE);
apply_mask_to_region (&srcPR, &maskPR, OPAQUE_OPACITY);
}
g_signal_handlers_disconnect_by_func (layer->mask,
gimp_layer_layer_mask_update,
layer);
gimp_item_removed (GIMP_ITEM (layer->mask));
g_object_unref (layer->mask);
layer->mask = NULL;
if (push_undo)
gimp_image_undo_group_end (gimage);
/* If applying actually changed the view */
if (view_changed)
{
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
item->width,
item->height);
}
else
{
gimp_viewable_invalidate_preview (GIMP_VIEWABLE (layer));
}
g_signal_emit (layer, layer_signals[MASK_CHANGED], 0);
}
void
gimp_layer_add_alpha (GimpLayer *layer)
{
PixelRegion srcPR, destPR;
TileManager *new_tiles;
GimpImageType new_type;
g_return_if_fail (GIMP_IS_LAYER (layer));
if (gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
return;
new_type = gimp_drawable_type_with_alpha (GIMP_DRAWABLE (layer));
/* Allocate the new tiles */
new_tiles = tile_manager_new (GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height,
GIMP_IMAGE_TYPE_BYTES (new_type));
/* Configure the pixel regions */
pixel_region_init (&srcPR, GIMP_DRAWABLE (layer)->tiles,
0, 0,
GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height,
FALSE);
pixel_region_init (&destPR, new_tiles,
0, 0,
GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height,
TRUE);
/* Add an alpha channel */
add_alpha_region (&srcPR, &destPR);
/* Set the new tiles */
gimp_drawable_set_tiles_full (GIMP_DRAWABLE (layer),
gimp_item_is_attached (GIMP_ITEM (layer)),
_("Add Alpha Channel"),
new_tiles, new_type,
GIMP_ITEM (layer)->offset_x,
GIMP_ITEM (layer)->offset_y);
tile_manager_unref (new_tiles);
}
void
gimp_layer_resize_to_image (GimpLayer *layer,
GimpContext *context)
{
GimpImage *gimage;
gint offset_x;
gint offset_y;
g_return_if_fail (GIMP_IS_LAYER (layer));
g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (layer)));
g_return_if_fail (GIMP_IS_CONTEXT (context));
gimage = gimp_item_get_image (GIMP_ITEM (layer));
gimp_image_undo_group_start (gimage, GIMP_UNDO_GROUP_ITEM_RESIZE,
_("Layer to Image Size"));
gimp_item_offsets (GIMP_ITEM (layer), &offset_x, &offset_y);
gimp_item_resize (GIMP_ITEM (layer), context,
gimage->width, gimage->height, offset_x, offset_y);
gimp_image_undo_group_end (gimage);
}
BoundSeg *
gimp_layer_boundary (GimpLayer *layer,
gint *num_segs)
{
GimpItem *item;
BoundSeg *new_segs;
g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
item = GIMP_ITEM (layer);
/* Create the four boundary segments that encompass this
* layer's boundary.
*/
new_segs = g_new (BoundSeg, 4);
*num_segs = 4;
/* if the layer is a floating selection */
if (gimp_layer_is_floating_sel (layer))
{
if (GIMP_IS_CHANNEL (layer->fs.drawable))
{
/* if the owner drawable is a channel, just return nothing */
g_free (new_segs);
*num_segs = 0;
return NULL;
}
else
{
/* otherwise, set the layer to the owner drawable */
layer = GIMP_LAYER (layer->fs.drawable);
}
}
new_segs[0].x1 = item->offset_x;
new_segs[0].y1 = item->offset_y;
new_segs[0].x2 = item->offset_x;
new_segs[0].y2 = item->offset_y + item->height;
new_segs[0].open = 1;
new_segs[1].x1 = item->offset_x;
new_segs[1].y1 = item->offset_y;
new_segs[1].x2 = item->offset_x + item->width;
new_segs[1].y2 = item->offset_y;
new_segs[1].open = 1;
new_segs[2].x1 = item->offset_x + item->width;
new_segs[2].y1 = item->offset_y;
new_segs[2].x2 = item->offset_x + item->width;
new_segs[2].y2 = item->offset_y + item->height;
new_segs[2].open = 0;
new_segs[3].x1 = item->offset_x;
new_segs[3].y1 = item->offset_y + item->height;
new_segs[3].x2 = item->offset_x + item->width;
new_segs[3].y2 = item->offset_y + item->height;
new_segs[3].open = 0;
return new_segs;
}
gboolean
gimp_layer_pick_correlate (GimpLayer *layer,
gint x,
gint y)
{
Tile *tile;
Tile *mask_tile;
gint val;
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
/* Is the point inside the layer?
* First transform the point to layer coordinates...
*/
x -= GIMP_ITEM (layer)->offset_x;
y -= GIMP_ITEM (layer)->offset_y;
if (x >= 0 && x < GIMP_ITEM (layer)->width &&
y >= 0 && y < GIMP_ITEM (layer)->height &&
gimp_item_get_visible (GIMP_ITEM (layer)))
{
/* If the point is inside, and the layer has no
* alpha channel, success!
*/
if (! gimp_drawable_has_alpha (GIMP_DRAWABLE (layer)))
return TRUE;
/* Otherwise, determine if the alpha value at
* the given point is non-zero
*/
tile = tile_manager_get_tile (GIMP_DRAWABLE (layer)->tiles,
x, y, TRUE, FALSE);
val = * ((guchar *) tile_data_pointer (tile,
x % TILE_WIDTH,
y % TILE_HEIGHT) +
tile_bpp (tile) - 1);
if (layer->mask)
{
guchar *ptr;
mask_tile = tile_manager_get_tile (GIMP_DRAWABLE (layer->mask)->tiles,
x, y, TRUE, FALSE);
ptr = tile_data_pointer (mask_tile, x % TILE_WIDTH, y % TILE_HEIGHT);
val = val * (*ptr) / 255;
tile_release (mask_tile, FALSE);
}
tile_release (tile, FALSE);
if (val > 63)
return TRUE;
}
return FALSE;
}
/**********************/
/* access functions */
/**********************/
GimpLayerMask *
gimp_layer_get_mask (const GimpLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
return layer->mask;
}
gboolean
gimp_layer_is_floating_sel (const GimpLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
return (layer->fs.drawable != NULL);
}
void
gimp_layer_set_opacity (GimpLayer *layer,
gdouble opacity,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_LAYER (layer));
opacity = CLAMP (opacity, GIMP_OPACITY_TRANSPARENT, GIMP_OPACITY_OPAQUE);
if (layer->opacity != opacity)
{
if (push_undo && gimp_item_is_attached (GIMP_ITEM (layer)))
{
GimpImage *gimage = gimp_item_get_image (GIMP_ITEM (layer));
if (gimage)
gimp_image_undo_push_layer_opacity (gimage, NULL, layer);
}
layer->opacity = opacity;
g_signal_emit (layer, layer_signals[OPACITY_CHANGED], 0);
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height);
}
}
gdouble
gimp_layer_get_opacity (const GimpLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LAYER (layer), GIMP_OPACITY_OPAQUE);
return layer->opacity;
}
void
gimp_layer_set_mode (GimpLayer *layer,
GimpLayerModeEffects mode,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_LAYER (layer));
if (layer->mode != mode)
{
if (push_undo && gimp_item_is_attached (GIMP_ITEM (layer)))
{
GimpImage *gimage = gimp_item_get_image (GIMP_ITEM (layer));
if (gimage)
gimp_image_undo_push_layer_mode (gimage, NULL, layer);
}
layer->mode = mode;
g_signal_emit (layer, layer_signals[MODE_CHANGED], 0);
gimp_drawable_update (GIMP_DRAWABLE (layer),
0, 0,
GIMP_ITEM (layer)->width,
GIMP_ITEM (layer)->height);
}
}
GimpLayerModeEffects
gimp_layer_get_mode (const GimpLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LAYER (layer), GIMP_NORMAL_MODE);
return layer->mode;
}
void
gimp_layer_set_preserve_trans (GimpLayer *layer,
gboolean preserve,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_LAYER (layer));
if (layer->preserve_trans != preserve)
{
if (push_undo && gimp_item_is_attached (GIMP_ITEM (layer)))
{
GimpImage *gimage = gimp_item_get_image (GIMP_ITEM (layer));
if (gimage)
gimp_image_undo_push_layer_preserve_trans (gimage, NULL, layer);
}
layer->preserve_trans = preserve ? TRUE : FALSE;
g_signal_emit (layer, layer_signals[PRESERVE_TRANS_CHANGED], 0);
}
}
gboolean
gimp_layer_get_preserve_trans (const GimpLayer *layer)
{
g_return_val_if_fail (GIMP_IS_LAYER (layer), FALSE);
return layer->preserve_trans;
}
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