gimp/app/gui/layers-commands.c

/* 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 <string.h> 

#include <gtk/gtk.h>

#include "libgimpmath/gimpmath.h"
#include "libgimpbase/gimpbase.h"
#include "libgimpwidgets/gimpwidgets.h"

#include "gui-types.h"

#include "paint-funcs/paint-funcs.h"

#include "core/gimp.h"
#include "core/gimpimage.h"
#include "core/gimpimage-mask.h"
#include "core/gimpimage-merge.h"
#include "core/gimplayer.h"
#include "core/gimplayermask.h"
#include "core/gimplist.h"

#include "display/gimpdisplay-foreach.h"

#include "widgets/gimpitemfactory.h"
#include "widgets/gimpwidgets-utils.h"

#include "layers-commands.h"
#include "resize-dialog.h"

#include "floating_sel.h"
#include "undo.h"

#include "libgimp/gimpintl.h"


static void   layers_add_mask_query       (GimpLayer *layer);
static void   layers_scale_layer_query    (GimpImage *gimage,
					   GimpLayer *layer);
static void   layers_resize_layer_query   (GimpImage *gimage,
					   GimpLayer *layer);
static void   layers_menu_set_sensitivity (GimpImage *gimage);


void
layers_previous_cmd_callback (GtkWidget *widget,
			      gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *new_layer;
  gint       current_layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  current_layer =
    gimp_image_get_layer_index (gimage, gimp_image_get_active_layer (gimage));

  if (current_layer > 0)
    {
      new_layer = (GimpLayer *)
	gimp_container_get_child_by_index (gimage->layers, current_layer - 1);

      if (new_layer)
	{
	  gimp_image_set_active_layer (gimage, new_layer);
	  gdisplays_flush ();
	}
    }
}

void
layers_next_cmd_callback (GtkWidget *widget,
			  gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *new_layer;
  gint       current_layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  current_layer =
    gimp_image_get_layer_index (gimage, gimp_image_get_active_layer (gimage));

  new_layer = 
    GIMP_LAYER (gimp_container_get_child_by_index (gimage->layers, 
						   current_layer + 1));

  if (new_layer)
    {
      gimp_image_set_active_layer (gimage, new_layer);
      gdisplays_flush ();
    }
}

void
layers_raise_cmd_callback (GtkWidget *widget,
			   gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_raise_layer (gimage, gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_lower_cmd_callback (GtkWidget *widget,
			   gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_lower_layer (gimage, gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_raise_to_top_cmd_callback (GtkWidget *widget,
				  gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_raise_layer_to_top (gimage, gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_lower_to_bottom_cmd_callback (GtkWidget *widget,
				     gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_lower_layer_to_bottom (gimage,
				    gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_new_cmd_callback (GtkWidget *widget,
			 gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layers_new_layer_query (gimage);
}

void
layers_duplicate_cmd_callback (GtkWidget *widget,
			       gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *active_layer;
  GimpLayer *new_layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  active_layer = gimp_image_get_active_layer (gimage);
  new_layer = gimp_layer_copy (active_layer, TRUE);
  gimp_image_add_layer (gimage, new_layer, -1);

  gdisplays_flush ();
}

void
layers_delete_cmd_callback (GtkWidget *widget,
			    gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layer = gimp_image_get_active_layer (gimage);

  if (! layer)
    return;

  if (gimp_layer_is_floating_sel (layer))
    floating_sel_remove (layer);
  else
    gimp_image_remove_layer (gimage, layer);

  gdisplays_flush ();
}

void
layers_scale_cmd_callback (GtkWidget *widget,
			   gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layers_scale_layer_query (gimage, gimp_image_get_active_layer (gimage));
}

void
layers_resize_cmd_callback (GtkWidget *widget,
			    gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layers_resize_layer_query (gimage, gimp_image_get_active_layer (gimage));
}

void
layers_resize_to_image_cmd_callback (GtkWidget *widget,
				     gpointer   data)
{
  GimpImage *gimage;
  
  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;
  
  gimp_layer_resize_to_image (gimp_image_get_active_layer (gimage));

  gdisplays_flush ();
}

void
layers_add_layer_mask_cmd_callback (GtkWidget *widget,
				    gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layers_add_mask_query (gimp_image_get_active_layer (gimage));
}

void
layers_apply_layer_mask_cmd_callback (GtkWidget *widget,
				      gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layer = gimp_image_get_active_layer (gimage);

  /*  Make sure there is a layer mask to apply  */
  if (layer && gimp_layer_get_mask (layer))
    {
      gboolean flush = ! layer->mask->apply_mask || layer->mask->show_mask;

      gimp_layer_apply_mask (layer, APPLY, TRUE);

      if (flush)
	gdisplays_flush ();
    }
}

void
layers_delete_layer_mask_cmd_callback (GtkWidget *widget,
				       gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layer = gimp_image_get_active_layer (gimage);

  /*  Make sure there is a layer mask to apply  */
  if (layer && gimp_layer_get_mask (layer))
    {
      gboolean flush = layer->mask->apply_mask || layer->mask->show_mask;

      gimp_layer_apply_mask (layer, DISCARD, TRUE);

      if (flush)
	gdisplays_flush ();
    }
}

void
layers_anchor_cmd_callback (GtkWidget *widget,
			    gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  floating_sel_anchor (gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_merge_layers_cmd_callback (GtkWidget *widget,
				  gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layers_layer_merge_query (gimage, TRUE);
}

void
layers_merge_down_cmd_callback (GtkWidget *widget,
				gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;
  
  gimp_image_merge_down (gimage, gimp_image_get_active_layer (gimage),
			 EXPAND_AS_NECESSARY);
  gdisplays_flush ();
}

void
layers_flatten_image_cmd_callback (GtkWidget *widget,
				   gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_flatten (gimage);
  gdisplays_flush ();
}

void
layers_alpha_select_cmd_callback (GtkWidget *widget,
				  gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_mask_layer_alpha (gimage, gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_mask_select_cmd_callback (GtkWidget *widget,
				 gpointer   data)
{
  GimpImage *gimage;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  gimp_image_mask_layer_mask (gimage, gimp_image_get_active_layer (gimage));
  gdisplays_flush ();
}

void
layers_add_alpha_channel_cmd_callback (GtkWidget *widget,
				       gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layer = gimp_image_get_active_layer (gimage);

  if (! layer)
    return;

  gimp_layer_add_alpha (layer);
  gdisplays_flush ();
}

void
layers_edit_attributes_cmd_callback (GtkWidget *widget,
				     gpointer   data)
{
  GimpImage *gimage;
  GimpLayer *layer;

  gimage = (GimpImage *) gimp_widget_get_callback_context (widget);

  if (! gimage)
    return;

  layer = gimp_image_get_active_layer (gimage);

  if (! layer)
    return;

  layers_edit_layer_query (layer);
}


/********************************/
/*  The new layer query dialog  */
/********************************/

typedef struct _NewLayerOptions NewLayerOptions;

struct _NewLayerOptions
{
  GtkWidget    *query_box;
  GtkWidget    *name_entry;
  GtkWidget    *size_se;

  GimpFillType  fill_type;
  gint          xsize;
  gint          ysize;

  GimpImage    *gimage;
};

static GimpFillType  fill_type  = TRANSPARENT_FILL;
static gchar        *layer_name = NULL;

static void
new_layer_query_ok_callback (GtkWidget *widget,
			     gpointer   data)
{
  NewLayerOptions *options;
  GimpLayer       *layer;
  GimpImage       *gimage;

  options = (NewLayerOptions *) data;

  if (layer_name)
    g_free (layer_name);
  layer_name = g_strdup (gtk_entry_get_text (GTK_ENTRY (options->name_entry)));

  options->xsize = 
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (options->size_se), 0));
  options->ysize =
    RINT (gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (options->size_se), 1));

  fill_type = options->fill_type;

  if ((gimage = options->gimage))
    {
      /*  Start a group undo  */
      undo_push_group_start (gimage, LAYER_ADD_UNDO);

      layer = gimp_layer_new (gimage, options->xsize, options->ysize,
			      gimp_image_base_type_with_alpha (gimage),
			      layer_name, OPAQUE_OPACITY, NORMAL_MODE);
      if (layer) 
	{
	  gimp_drawable_fill_by_type (GIMP_DRAWABLE (layer),
				      gimp_get_user_context (gimage->gimp),
				      fill_type);
	  gimp_image_add_layer (gimage, layer, -1);
	  
	  /*  End the group undo  */
	  undo_push_group_end (gimage);
	  
	  gdisplays_flush ();
	} 
      else 
	{
	  g_message ("new_layer_query_ok_callback():\n"
		     "could not allocate new layer");
	}
    }

  gtk_widget_destroy (options->query_box);
}

void
layers_new_layer_query (GimpImage *gimage)
{
  NewLayerOptions *options;
  GimpLayer       *floating_sel;
  GtkWidget       *vbox;
  GtkWidget       *table;
  GtkWidget       *label;
  GtkObject       *adjustment;
  GtkWidget       *spinbutton;
  GtkWidget       *frame;

  g_return_if_fail (GIMP_IS_IMAGE (gimage));

  /*  If there is a floating selection, the new command transforms
   *  the current fs into a new layer
   */
  if ((floating_sel = gimp_image_floating_sel (gimage)))
    {
      floating_sel_to_layer (floating_sel);

      gdisplays_flush ();
      return;
    }

  options = g_new0 (NewLayerOptions, 1);

  options->fill_type = fill_type;
  options->gimage    = gimage;

  /*  The dialog  */
  options->query_box =
    gimp_dialog_new (_("New Layer Options"), "new_layer_options",
		     gimp_standard_help_func,
		     "dialogs/layers/new_layer.html",
		     GTK_WIN_POS_MOUSE,
		     FALSE, TRUE, FALSE,

		     GTK_STOCK_CANCEL, gtk_widget_destroy,
		     NULL, 1, NULL, FALSE, TRUE,

		     GTK_STOCK_OK, new_layer_query_ok_callback,
		     options, NULL, NULL, TRUE, FALSE,

		     NULL);

  g_object_weak_ref (G_OBJECT (options->query_box),
		     (GWeakNotify) g_free,
		     options);

  /*  The main vbox  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (options->query_box)->vbox),
		     vbox);

  table = gtk_table_new (3, 2, FALSE);
  gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
  gtk_table_set_row_spacing (GTK_TABLE (table), 0, 4);
  gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, FALSE, 0);

  /*  The name label and entry  */
  label = gtk_label_new (_("Layer Name:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 1);
  gtk_widget_show (label);

  options->name_entry = gtk_entry_new ();
  gtk_widget_set_usize (options->name_entry, 75, 0);
  gtk_table_attach_defaults (GTK_TABLE (table), 
			     options->name_entry, 1, 2, 0, 1);
  gtk_entry_set_text (GTK_ENTRY (options->name_entry),
		      (layer_name ? layer_name : _("New Layer")));
  gtk_widget_show (options->name_entry);

  /*  The size labels  */
  label = gtk_label_new (_("Layer Width:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
  gtk_widget_show (label);

  label = gtk_label_new (_("Height:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK, 0, 0);
  gtk_widget_show (label);

  /*  The size sizeentry  */
  adjustment = gtk_adjustment_new (1, 1, 1, 1, 10, 1);
  spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment), 1, 2);
  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
  gtk_widget_set_usize (spinbutton, 75, 0);
  
  options->size_se = gimp_size_entry_new (1, gimage->unit, "%a",
					  TRUE, TRUE, FALSE, 75,
					  GIMP_SIZE_ENTRY_UPDATE_SIZE);
  gimp_size_entry_add_field (GIMP_SIZE_ENTRY (options->size_se),
                             GTK_SPIN_BUTTON (spinbutton), NULL);
  gtk_table_attach_defaults (GTK_TABLE (options->size_se), spinbutton,
                             1, 2, 0, 1);
  gtk_widget_show (spinbutton);
  gtk_table_attach (GTK_TABLE (table), options->size_se, 1, 2, 1, 3,
                    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (options->size_se);

  gimp_size_entry_set_unit (GIMP_SIZE_ENTRY (options->size_se), 
			    GIMP_UNIT_PIXEL);

  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (options->size_se), 0,
                                  gimage->xresolution, FALSE);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (options->size_se), 1,
                                  gimage->yresolution, FALSE);

  gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (options->size_se), 0,
                                         GIMP_MIN_IMAGE_SIZE,
                                         GIMP_MAX_IMAGE_SIZE);
  gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (options->size_se), 1,
                                         GIMP_MIN_IMAGE_SIZE,
                                         GIMP_MAX_IMAGE_SIZE);

  gimp_size_entry_set_size (GIMP_SIZE_ENTRY (options->size_se), 0,
			    0, gimage->width);
  gimp_size_entry_set_size (GIMP_SIZE_ENTRY (options->size_se), 1,
			    0, gimage->height);

  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (options->size_se), 0,
			      gimage->width);
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (options->size_se), 1,
			      gimage->height);

  gtk_widget_show (table);

  /*  The radio frame  */
  frame = gimp_radio_group_new2
    (TRUE, _("Layer Fill Type"),
     G_CALLBACK (gimp_radio_button_update),
     &options->fill_type,
     GINT_TO_POINTER (options->fill_type),

     _("Foreground"),  GINT_TO_POINTER (FOREGROUND_FILL),  NULL,
     _("Background"),  GINT_TO_POINTER (BACKGROUND_FILL),  NULL,
     _("White"),       GINT_TO_POINTER (WHITE_FILL),       NULL,
     _("Transparent"), GINT_TO_POINTER (TRANSPARENT_FILL), NULL,

     NULL);

  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_widget_show (frame);

  gtk_widget_show (vbox);
  gtk_widget_show (options->query_box);
}

/**************************************/
/*  The edit layer attributes dialog  */
/**************************************/

typedef struct _EditLayerOptions EditLayerOptions;

struct _EditLayerOptions
{
  GtkWidget *query_box;
  GtkWidget *name_entry;
  GimpLayer *layer;
  GimpImage *gimage;
};

static void
edit_layer_query_ok_callback (GtkWidget *widget,
			      gpointer   data)
{
  EditLayerOptions *options;
  GimpLayer        *layer;

  options = (EditLayerOptions *) data;

  if ((layer = options->layer))
    {
      /*  Set the new layer name  */
      if (GIMP_OBJECT (layer)->name && gimp_layer_is_floating_sel (layer))
	{
	  /*  If the layer is a floating selection, make it a layer  */
	  floating_sel_to_layer (layer);
	}
      else
        {
	  /* We're doing a plain rename */
          undo_push_layer_rename (options->gimage, layer);
        }

      gimp_object_set_name (GIMP_OBJECT (layer),
			    gtk_entry_get_text (GTK_ENTRY (options->name_entry)));
    }

  gdisplays_flush ();

  gtk_widget_destroy (options->query_box); 
}

void
layers_edit_layer_query (GimpLayer *layer)
{
  EditLayerOptions *options;
  GtkWidget        *vbox;
  GtkWidget        *hbox;
  GtkWidget        *label;

  /*  The new options structure  */
  options = g_new (EditLayerOptions, 1);
  options->layer  = layer;
  options->gimage = gimp_drawable_gimage (GIMP_DRAWABLE (layer));

  /*  The dialog  */
  options->query_box =
    gimp_dialog_new (_("Edit Layer Attributes"), "edit_layer_attributes",
		     gimp_standard_help_func,
		     "dialogs/layers/edit_layer_attributes.html",
		     GTK_WIN_POS_MOUSE,
		     FALSE, TRUE, FALSE,

		     GTK_STOCK_CANCEL, gtk_widget_destroy,
		     NULL, 1, NULL, FALSE, TRUE,

		     GTK_STOCK_OK, edit_layer_query_ok_callback,
		     options, NULL, NULL, TRUE, FALSE,

		     NULL);

  g_object_weak_ref (G_OBJECT (options->query_box),
		     (GWeakNotify) g_free,
		     options);

  g_signal_connect_object (G_OBJECT (layer), "removed",
			   G_CALLBACK (gtk_widget_destroy),
			   G_OBJECT (options->query_box),
			   G_CONNECT_SWAPPED);

  /*  The main vbox  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (options->query_box)->vbox),
		     vbox);

  /*  The name hbox, label and entry  */
  hbox = gtk_hbox_new (FALSE, 4);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);

  label = gtk_label_new (_("Layer name:"));
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, FALSE, 0);
  gtk_widget_show (label);

  options->name_entry = gtk_entry_new ();
  gtk_box_pack_start (GTK_BOX (hbox), options->name_entry, TRUE, TRUE, 0);
  gtk_entry_set_text (GTK_ENTRY (options->name_entry),
		      ((gimp_layer_is_floating_sel (layer) ?
			_("Floating Selection") :
			gimp_object_get_name (GIMP_OBJECT (layer)))));
  gtk_widget_show (options->name_entry);

  g_signal_connect (G_OBJECT (options->name_entry), "activate",
		    G_CALLBACK (edit_layer_query_ok_callback),
		    options);

  gtk_widget_show (hbox);

  gtk_widget_show (vbox);
  gtk_widget_show (options->query_box);
}

/*******************************/
/*  The add mask query dialog  */
/*******************************/

typedef struct _AddMaskOptions AddMaskOptions;

struct _AddMaskOptions
{
  GtkWidget   *query_box;
  GimpLayer   *layer;
  AddMaskType  add_mask_type;
};

static void
add_mask_query_ok_callback (GtkWidget *widget,
			    gpointer   data)
{
  AddMaskOptions *options;
  GimpImage      *gimage;
  GimpLayerMask  *mask;
  GimpLayer      *layer;

  options = (AddMaskOptions *) data;

  if ((layer = (options->layer)) &&
      (gimage = GIMP_DRAWABLE (layer)->gimage))
    {
      mask = gimp_layer_create_mask (layer, options->add_mask_type);
      gimp_layer_add_mask (layer, mask, TRUE);
      gdisplays_flush ();
    }

  gtk_widget_destroy (options->query_box);
}

static void
layers_add_mask_query (GimpLayer *layer)
{
  AddMaskOptions *options;
  GtkWidget      *frame;
  GimpImage      *gimage;
  
  /*  The new options structure  */
  options = g_new (AddMaskOptions, 1);
  options->layer         = layer;
  options->add_mask_type = ADD_WHITE_MASK;

  gimage = GIMP_DRAWABLE (layer)->gimage;
  
  /*  The dialog  */
  options->query_box =
    gimp_dialog_new (_("Add Mask Options"), "add_mask_options",
		     gimp_standard_help_func,
		     "dialogs/layers/add_layer_mask.html",
		     GTK_WIN_POS_MOUSE,
		     FALSE, TRUE, FALSE,

		     GTK_STOCK_CANCEL, gtk_widget_destroy,
		     NULL, 1, NULL, FALSE, TRUE,

		     GTK_STOCK_OK, add_mask_query_ok_callback,
		     options, NULL, NULL, TRUE, FALSE,

		     NULL);

  g_object_weak_ref (G_OBJECT (options->query_box),
		     (GWeakNotify) g_free,
		     options);

  g_signal_connect_object (G_OBJECT (layer), "removed",
			   G_CALLBACK (gtk_widget_destroy),
			   G_OBJECT (options->query_box),
			   G_CONNECT_SWAPPED);

  /*  The radio frame and box  */
  if (gimage->selection_mask)
    {
      options->add_mask_type = ADD_SELECTION_MASK;

      frame = gimp_radio_group_new2 (TRUE, _("Initialize Layer Mask to:"),
				     G_CALLBACK (gimp_radio_button_update),
				     &options->add_mask_type,
				     GINT_TO_POINTER (options->add_mask_type),

				     _("Selection"),
				     GINT_TO_POINTER (ADD_SELECTION_MASK), NULL,
				     _("Inverse Selection"),
				     GINT_TO_POINTER (ADD_INV_SELECTION_MASK), NULL,
				     _("White (Full Opacity)"),
				     GINT_TO_POINTER (ADD_WHITE_MASK), NULL,
				     _("Black (Full Transparency)"),
				     GINT_TO_POINTER (ADD_BLACK_MASK), NULL,
				     _("Layer's Alpha Channel"),
				     GINT_TO_POINTER (ADD_ALPHA_MASK), NULL,

				     NULL);
    }
  else
    {
      frame = gimp_radio_group_new2 (TRUE, _("Initialize Layer Mask to:"),
				     G_CALLBACK (gimp_radio_button_update),
				     &options->add_mask_type,
				     GINT_TO_POINTER (options->add_mask_type),

				     _("White (Full Opacity)"),
				     GINT_TO_POINTER (ADD_WHITE_MASK), NULL,
				     _("Black (Full Transparency)"),
				     GINT_TO_POINTER (ADD_BLACK_MASK), NULL,
				     _("Layer's Alpha Channel"),
				     GINT_TO_POINTER (ADD_ALPHA_MASK), NULL,

				     NULL);
    }
  gtk_container_set_border_width (GTK_CONTAINER (frame), 6);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (options->query_box)->vbox),
		     frame);
  gtk_widget_show (frame);

  gtk_widget_show (options->query_box);
}


/****************************/
/*  The scale layer dialog  */
/****************************/

typedef struct _ScaleLayerOptions ScaleLayerOptions;

struct _ScaleLayerOptions
{
  GimpLayer *layer;
  Resize    *resize;
};

static void
scale_layer_query_ok_callback (GtkWidget *widget,
			       gpointer   data)
{
  ScaleLayerOptions *options;
  GimpImage         *gimage;
  GimpLayer         *layer;

  options = (ScaleLayerOptions *) data;

  if (options->resize->width > 0 && options->resize->height > 0 &&
      (layer =  (options->layer)))
    {
      gtk_widget_set_sensitive (options->resize->resize_shell, FALSE);

      if ((gimage = GIMP_DRAWABLE (layer)->gimage) != NULL)
	{
	  undo_push_group_start (gimage, LAYER_SCALE_UNDO);

	  if (gimp_layer_is_floating_sel (layer))
	    floating_sel_relax (layer, TRUE);

	  gimp_layer_scale (layer, 
			    options->resize->width, options->resize->height,
			    TRUE);

	  if (gimp_layer_is_floating_sel (layer))
	    floating_sel_rigor (layer, TRUE);

	  undo_push_group_end (gimage);

	  gdisplays_flush ();
	}

      gtk_widget_destroy (options->resize->resize_shell);
    }
  else
    {
      g_message (_("Invalid width or height.\n"
		   "Both must be positive."));
    }
}

static void
layers_scale_layer_query (GimpImage *gimage,
                          GimpLayer *layer)
{
  ScaleLayerOptions *options;

  /*  the new options structure  */
  options = g_new (ScaleLayerOptions, 1);
  options->layer  = layer;
  options->resize =
    resize_widget_new (gimage,
                       ScaleWidget,
		       ResizeLayer,
		       G_OBJECT (layer),
		       "removed",
		       gimp_drawable_width (GIMP_DRAWABLE (layer)),
		       gimp_drawable_height (GIMP_DRAWABLE (layer)),
		       gimage->xresolution,
		       gimage->yresolution,
		       gimage->unit,
		       TRUE,
		       G_CALLBACK (scale_layer_query_ok_callback),
		       NULL,
		       options);

  g_object_weak_ref (G_OBJECT (options->resize->resize_shell),
		     (GWeakNotify) g_free,
		     options);

  gtk_widget_show (options->resize->resize_shell);
}

/*****************************/
/*  The resize layer dialog  */
/*****************************/

typedef struct _ResizeLayerOptions ResizeLayerOptions;

struct _ResizeLayerOptions
{
  GimpLayer *layer;
  Resize    *resize;
};

static void
resize_layer_query_ok_callback (GtkWidget *widget,
				gpointer   data)
{
  ResizeLayerOptions *options;
  GimpImage          *gimage;
  GimpLayer          *layer;

  options = (ResizeLayerOptions *) data;

  if (options->resize->width > 0 && options->resize->height > 0 &&
      (layer = (options->layer)))
    {
      gtk_widget_set_sensitive (options->resize->resize_shell, FALSE);

      if ((gimage = GIMP_DRAWABLE (layer)->gimage) != NULL)
	{
	  undo_push_group_start (gimage, LAYER_RESIZE_UNDO);

	  if (gimp_layer_is_floating_sel (layer))
	    floating_sel_relax (layer, TRUE);

	  gimp_layer_resize (layer,
			     options->resize->width,
			     options->resize->height,
			     options->resize->offset_x,
			     options->resize->offset_y);

	  if (gimp_layer_is_floating_sel (layer))
	    floating_sel_rigor (layer, TRUE);

	  undo_push_group_end (gimage);

	  gdisplays_flush ();
	}

      gtk_widget_destroy (options->resize->resize_shell);
    }
  else
    {
      g_message (_("Invalid width or height.\n"
		   "Both must be positive."));
    }
}

static void
layers_resize_layer_query (GimpImage *gimage,
                           GimpLayer *layer)
{
  ResizeLayerOptions *options;

  /*  the new options structure  */
  options = g_new (ResizeLayerOptions, 1);
  options->layer  = layer;
  options->resize =
    resize_widget_new (gimage,
                       ResizeWidget,
		       ResizeLayer,
		       G_OBJECT (layer),
		       "removed",
		       gimp_drawable_width (GIMP_DRAWABLE (layer)),
		       gimp_drawable_height (GIMP_DRAWABLE (layer)),
		       gimage->xresolution,
		       gimage->yresolution,
		       gimage->unit,
		       TRUE,
		       G_CALLBACK (resize_layer_query_ok_callback),
		       NULL,
		       options);

  g_object_weak_ref (G_OBJECT (options->resize->resize_shell),
		     (GWeakNotify) g_free,
		     options);

  gtk_widget_show (options->resize->resize_shell);
}

/****************************/
/*  The layer merge dialog  */
/****************************/

typedef struct _LayerMergeOptions LayerMergeOptions;

struct _LayerMergeOptions
{
  GtkWidget *query_box;
  GimpImage *gimage;
  gboolean   merge_visible;
  MergeType  merge_type;
};

static void
layer_merge_query_ok_callback (GtkWidget *widget,
			       gpointer   data)
{
  LayerMergeOptions *options;
  GimpImage         *gimage;

  options = (LayerMergeOptions *) data;
  if (! (gimage = options->gimage))
    return;

  if (options->merge_visible)
    gimp_image_merge_visible_layers (gimage, options->merge_type);

  gdisplays_flush ();

  gtk_widget_destroy (options->query_box);
}

void
layers_layer_merge_query (GimpImage   *gimage,
			  /*  if FALSE, anchor active layer  */
			  gboolean     merge_visible)
{
  LayerMergeOptions *options;
  GtkWidget         *vbox;
  GtkWidget         *frame;

  /*  The new options structure  */
  options = g_new (LayerMergeOptions, 1);
  options->gimage        = gimage;
  options->merge_visible = merge_visible;
  options->merge_type    = EXPAND_AS_NECESSARY;

  /* The dialog  */
  options->query_box =
    gimp_dialog_new (_("Layer Merge Options"), "layer_merge_options",
		     gimp_standard_help_func,
		     "dialogs/layers/merge_visible_layers.html",
		     GTK_WIN_POS_MOUSE,
		     FALSE, TRUE, FALSE,

		     GTK_STOCK_CANCEL, gtk_widget_destroy,
		     NULL, 1, NULL, FALSE, TRUE,

		     GTK_STOCK_OK, layer_merge_query_ok_callback,
		     options, NULL, NULL, TRUE, FALSE,

		     NULL);

  g_object_weak_ref (G_OBJECT (options->query_box),
		     (GWeakNotify) g_free,
		     options);

  /*  The main vbox  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (options->query_box)->vbox),
		     vbox);

  frame = gimp_radio_group_new2 (TRUE,
				 merge_visible ?
				 _("Final, Merged Layer should be:") :
				 _("Final, Anchored Layer should be:"),
				 G_CALLBACK (gimp_radio_button_update),
				 &options->merge_type,
				 GINT_TO_POINTER (options->merge_type),

				 _("Expanded as necessary"),
				 GINT_TO_POINTER (EXPAND_AS_NECESSARY), NULL,
				 _("Clipped to image"),
				 GINT_TO_POINTER (CLIP_TO_IMAGE), NULL,
				 _("Clipped to bottom layer"),
				 GINT_TO_POINTER (CLIP_TO_BOTTOM_LAYER), NULL,

				 NULL);

  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_widget_show (frame);

  gtk_widget_show (vbox);
  gtk_widget_show (options->query_box);
}

void
layers_show_context_menu (GimpImage *gimage)
{
  GtkItemFactory *item_factory;

  layers_menu_set_sensitivity (gimage);

  item_factory = gtk_item_factory_from_path ("<Layers>");

  gimp_item_factory_popup_with_data (item_factory, gimage);
}

static void
layers_menu_set_sensitivity (GimpImage *gimage)
{
  GimpLayer *layer;
  gboolean   fs         = FALSE;    /*  floating sel           */
  gboolean   ac         = FALSE;    /*  active channel         */
  gboolean   lm         = FALSE;    /*  layer mask             */
  gboolean   lp         = FALSE;    /*  layers present         */
  gboolean   alpha      = FALSE;    /*  alpha channel present  */
  gboolean   indexed    = FALSE;    /*  is indexed             */
  gboolean   next_alpha = FALSE;
  GList     *list;
  GList     *next       = NULL;
  GList     *prev       = NULL;

  g_return_if_fail (gimage != NULL);
  g_return_if_fail (GIMP_IS_IMAGE (gimage));

  layer = gimp_image_get_active_layer (gimage);

  if (layer)
    lm = (gimp_layer_get_mask (layer)) ? TRUE : FALSE;

  fs = (gimp_image_floating_sel (gimage) != NULL);
  ac = (gimp_image_get_active_channel (gimage) != NULL);

  alpha = layer && gimp_layer_has_alpha (layer);

  lp      = ! gimp_image_is_empty (gimage);
  indexed = (gimp_image_base_type (gimage) == INDEXED);

  for (list = GIMP_LIST (gimage->layers)->list;
       list;
       list = g_list_next (list)) 
    {
      if (layer == (GimpLayer *) list->data)
	{
	  prev = g_list_previous (list);
	  next = g_list_next (list);
	  break;
	}
    }

  if (next)
    next_alpha = gimp_layer_has_alpha (GIMP_LAYER (next->data));
  else
    next_alpha = FALSE;

#define SET_SENSITIVE(menu,condition) \
        gimp_menu_item_set_sensitive ("<Layers>/" menu, (condition) != 0)

  SET_SENSITIVE ("New Layer...", gimage);

  SET_SENSITIVE ("Stack/Raise Layer",
		 !fs && !ac && gimage && lp && alpha && prev);

  SET_SENSITIVE ("Stack/Lower Layer",
		 !fs && !ac && gimage && lp && next && next_alpha);

  SET_SENSITIVE ("Stack/Layer to Top",
		 !fs && !ac && gimage && lp && alpha && prev);
  SET_SENSITIVE ("Stack/Layer to Bottom",
		 !fs && !ac && gimage && lp && next && next_alpha);

  SET_SENSITIVE ("Duplicate Layer", !fs && !ac && gimage && lp);
  SET_SENSITIVE ("Anchor Layer", !fs && !ac && gimage && lp);
  SET_SENSITIVE ("Delete Layer", !ac && gimage && lp);

  SET_SENSITIVE ("Layer Boundary Size...", !ac && gimage && lp);
  SET_SENSITIVE ("Layer to Imagesize", !ac && gimage && lp);
  SET_SENSITIVE ("Scale Layer...", !ac && gimage && lp);

  SET_SENSITIVE ("Merge Visible Layers...", !fs && !ac && gimage && lp);
  SET_SENSITIVE ("Merge Down", !fs && !ac && gimage && lp && next);
  SET_SENSITIVE ("Flatten Image", !fs && !ac && gimage && lp);

  SET_SENSITIVE ("Add Layer Mask...", 
		 !fs && !ac && gimage && !lm && lp && alpha && !indexed);
  SET_SENSITIVE ("Apply Layer Mask", !fs && !ac && gimage && lm && lp);
  SET_SENSITIVE ("Delete Layer Mask", !fs && !ac && gimage && lm && lp);
  SET_SENSITIVE ("Mask to Selection", !fs && !ac && gimage && lm && lp);

  SET_SENSITIVE ("Add Alpha Channel", !fs && !alpha);
  SET_SENSITIVE ("Alpha to Selection", !fs && !ac && gimage && lp && alpha);

  SET_SENSITIVE ("Edit Layer Attributes...", !fs && !ac && gimage && lp);

#undef SET_SENSITIVE
}