gimpimage-resize.c 117 KB
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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.
 */
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#include "config.h"

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#include <string.h>
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#include <glib-object.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "libgimpbase/gimpbase.h"
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#include "core-types.h"

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#include "base/pixel-region.h"
#include "base/temp-buf.h"
#include "base/tile-manager.h"
#include "base/tile.h"
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#include "paint-funcs/paint-funcs.h"

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#include "gimp.h"
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#include "gimpcontext.h"
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#include "gimpcoreconfig.h"
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#include "gimpimage.h"
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#include "gimpimage-colorhash.h"
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#include "gimpimage-mask.h"
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#include "gimpimage-undo.h"
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#include "gimplayer.h"
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#include "gimplayermask.h"
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#include "gimplist.h"
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#include "gimpmarshal.h"
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#include "gimpparasite.h"
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#include "gimpparasitelist.h"
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#include "gimpundostack.h"
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#include "floating_sel.h"
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#include "path.h"
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#include "undo.h"
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#include "libgimp/gimpintl.h"

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#ifdef DEBUG
#define TRC(x) printf x
#else
#define TRC(x)
#endif

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#define GUIDE_EPSILON 5

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/*  Local function declarations  */
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static void     gimp_image_class_init            (GimpImageClass *klass);
static void     gimp_image_init                  (GimpImage      *gimage);
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static void     gimp_image_dispose               (GObject        *object);
static void     gimp_image_finalize              (GObject        *object);

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static void     gimp_image_name_changed          (GimpObject     *object);
static void     gimp_image_invalidate_preview    (GimpViewable   *viewable);
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static void     gimp_image_size_changed          (GimpViewable   *viewable);
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static void     gimp_image_real_colormap_changed (GimpImage      *gimage,
						  gint            ncol);
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static TempBuf *gimp_image_get_preview           (GimpViewable   *gimage,
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						  gint            width,
						  gint            height);
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static TempBuf *gimp_image_get_new_preview       (GimpViewable   *viewable,
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						  gint            width, 
						  gint            height);
static void     gimp_image_free_projection       (GimpImage      *gimage);
static void     gimp_image_allocate_shadow       (GimpImage      *gimage,
						  gint            width,
						  gint            height,
						  gint            bpp);
static void     gimp_image_allocate_projection   (GimpImage      *gimage);
static void     gimp_image_construct_layers      (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_construct_channels    (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_initialize_projection (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
static void     gimp_image_get_active_channels   (GimpImage      *gimage,
						  GimpDrawable   *drawable,
						  gint           *active);
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static void     gimp_image_construct             (GimpImage      *gimage,
						  gint            x,
						  gint            y,
						  gint            w,
						  gint            h);
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/*  projection functions  */
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static void     project_intensity                (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_intensity_alpha          (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_indexed                  (GimpImage      *gimage,
						  GimpLayer      *layer,
						  PixelRegion    *src,
						  PixelRegion    *dest);
static void     project_indexed_alpha            (GimpImage      *gimage, 
						  GimpLayer      *layer,
						  PixelRegion    *src, 
						  PixelRegion    *dest,
						  PixelRegion    *mask);
static void     project_channel                  (GimpImage      *gimage,
						  GimpChannel    *channel,
						  PixelRegion    *src,
						  PixelRegion    *src2);
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/*
 *  Global variables
 */
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static gint valid_combinations[][MAX_CHANNELS + 1] =
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{
  /* RGB GIMAGE */
  { -1, -1, -1, COMBINE_INTEN_INTEN, COMBINE_INTEN_INTEN_A },
  /* RGBA GIMAGE */
  { -1, -1, -1, COMBINE_INTEN_A_INTEN, COMBINE_INTEN_A_INTEN_A },
  /* GRAY GIMAGE */
  { -1, COMBINE_INTEN_INTEN, COMBINE_INTEN_INTEN_A, -1, -1 },
  /* GRAYA GIMAGE */
  { -1, COMBINE_INTEN_A_INTEN, COMBINE_INTEN_A_INTEN_A, -1, -1 },
  /* INDEXED GIMAGE */
  { -1, COMBINE_INDEXED_INDEXED, COMBINE_INDEXED_INDEXED_A, -1, -1 },
  /* INDEXEDA GIMAGE */
  { -1, -1, COMBINE_INDEXED_A_INDEXED_A, -1, -1 },
};


/*
 *  Static variables
 */

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enum
{
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  MODE_CHANGED,
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  ALPHA_CHANGED,
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  FLOATING_SELECTION_CHANGED,
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  ACTIVE_LAYER_CHANGED,
  ACTIVE_CHANNEL_CHANGED,
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  COMPONENT_VISIBILITY_CHANGED,
  COMPONENT_ACTIVE_CHANGED,
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  MASK_CHANGED,
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  RESOLUTION_CHANGED,
  UNIT_CHANGED,
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  QMASK_CHANGED,
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  SELECTION_CONTROL,
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  CLEAN,
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  DIRTY,
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  UPDATE,
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  UPDATE_GUIDE,
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  COLORMAP_CHANGED,
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  UNDO_EVENT,
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  LAST_SIGNAL
};
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static guint gimp_image_signals[LAST_SIGNAL] = { 0 };

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static GimpViewableClass *parent_class = NULL;
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GType 
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gimp_image_get_type (void) 
{
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  static GType image_type = 0;
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  if (! image_type)
    {
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      static const GTypeInfo image_info =
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      {
        sizeof (GimpImageClass),
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        NULL,           /* base_init */
        NULL,           /* base_finalize */
        (GClassInitFunc) gimp_image_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GimpImage),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gimp_image_init,
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      };

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      image_type = g_type_register_static (GIMP_TYPE_VIEWABLE,
					   "GimpImage",
					   &image_info, 0);
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    }

  return image_type;
}

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static void
gimp_image_class_init (GimpImageClass *klass)
{
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  GObjectClass      *object_class;
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  GimpObjectClass   *gimp_object_class;
  GimpViewableClass *viewable_class;
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  object_class      = G_OBJECT_CLASS (klass);
  gimp_object_class = GIMP_OBJECT_CLASS (klass);
  viewable_class    = GIMP_VIEWABLE_CLASS (klass);
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  parent_class = g_type_class_peek_parent (klass);
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  gimp_image_signals[MODE_CHANGED] =
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    g_signal_new ("mode_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, mode_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[ALPHA_CHANGED] =
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    g_signal_new ("alpha_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, alpha_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[FLOATING_SELECTION_CHANGED] =
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    g_signal_new ("floating_selection_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, floating_selection_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[ACTIVE_LAYER_CHANGED] =
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    g_signal_new ("active_layer_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, active_layer_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[ACTIVE_CHANNEL_CHANGED] =
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    g_signal_new ("active_channel_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, active_channel_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[COMPONENT_VISIBILITY_CHANGED] =
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    g_signal_new ("component_visibility_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, component_visibility_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT,
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		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
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  gimp_image_signals[COMPONENT_ACTIVE_CHANGED] =
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    g_signal_new ("component_active_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, component_active_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT,
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		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
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  gimp_image_signals[MASK_CHANGED] =
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    g_signal_new ("mask_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, mask_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[RESOLUTION_CHANGED] =
    g_signal_new ("resolution_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, resolution_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);

  gimp_image_signals[UNIT_CHANGED] =
    g_signal_new ("unit_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, unit_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);

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  gimp_image_signals[QMASK_CHANGED] =
    g_signal_new ("qmask_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, qmask_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);

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  gimp_image_signals[SELECTION_CONTROL] =
    g_signal_new ("selection_control",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, selection_control),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT,
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		  G_TYPE_NONE, 1,
                  G_TYPE_INT);

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  gimp_image_signals[CLEAN] =
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    g_signal_new ("clean",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, clean),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[DIRTY] =
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    g_signal_new ("dirty",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, dirty),
		  NULL, NULL,
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		  gimp_marshal_VOID__VOID,
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		  G_TYPE_NONE, 0);
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  gimp_image_signals[UPDATE] =
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    g_signal_new ("update",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, update),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT_INT_INT_INT,
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		  G_TYPE_NONE, 4,
		  G_TYPE_INT,
		  G_TYPE_INT,
		  G_TYPE_INT,
		  G_TYPE_INT);
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  gimp_image_signals[UPDATE_GUIDE] =
    g_signal_new ("update_guide",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, update_guide),
		  NULL, NULL,
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		  gimp_marshal_VOID__POINTER,
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		  G_TYPE_NONE, 1,
		  G_TYPE_POINTER);

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  gimp_image_signals[COLORMAP_CHANGED] =
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    g_signal_new ("colormap_changed",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, colormap_changed),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT,
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		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
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  gimp_image_signals[UNDO_EVENT] = 
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    g_signal_new ("undo_event",
		  G_TYPE_FROM_CLASS (klass),
		  G_SIGNAL_RUN_FIRST,
		  G_STRUCT_OFFSET (GimpImageClass, undo_event),
		  NULL, NULL,
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		  gimp_marshal_VOID__INT,
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		  G_TYPE_NONE, 1,
		  G_TYPE_INT);
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  object_class->dispose               = gimp_image_dispose;
  object_class->finalize              = gimp_image_finalize;
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  gimp_object_class->name_changed     = gimp_image_name_changed;
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  viewable_class->invalidate_preview  = gimp_image_invalidate_preview;
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  viewable_class->size_changed        = gimp_image_size_changed;
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  viewable_class->get_preview         = gimp_image_get_preview;
  viewable_class->get_new_preview     = gimp_image_get_new_preview;
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  klass->mode_changed                 = NULL;
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  klass->alpha_changed                = NULL;
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  klass->floating_selection_changed   = NULL;
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  klass->active_layer_changed         = NULL;
  klass->active_channel_changed       = NULL;
  klass->component_visibility_changed = NULL;
  klass->component_active_changed     = NULL;
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  klass->mask_changed                 = NULL;
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  klass->clean                        = NULL;
  klass->dirty                        = NULL;
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  klass->update                       = NULL;
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  klass->update_guide                 = NULL;
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  klass->colormap_changed             = gimp_image_real_colormap_changed;
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  klass->undo_event                   = NULL;
  klass->undo                         = gimp_image_undo;
  klass->redo                         = gimp_image_redo;
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  gimp_image_color_hash_init ();
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}


/* static functions */

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static void 
gimp_image_init (GimpImage *gimage)
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{
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  gimage->ID                    = 0;
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  gimage->save_proc             = NULL;

  gimage->width                 = 0;
  gimage->height                = 0;
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  gimage->xresolution           = 1.0;
  gimage->yresolution           = 1.0;
  gimage->unit                  = GIMP_UNIT_INCH;
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  gimage->base_type             = RGB;

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  gimage->cmap                  = NULL;
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  gimage->num_cols              = 0;

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  gimage->dirty                 = 1;
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  gimage->undo_on               = TRUE;
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  gimage->instance_count        = 0;
  gimage->disp_count            = 0;

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  gimage->tattoo_state          = 0;
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  gimage->shadow                = NULL;

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  gimage->construct_flag        = FALSE;
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  gimage->proj_type             = RGBA_GIMAGE;
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  gimage->projection            = NULL;
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  gimage->guides                = NULL;
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  gimage->layers                = gimp_list_new (GIMP_TYPE_LAYER, 
						 GIMP_CONTAINER_POLICY_STRONG);
  gimage->channels              = gimp_list_new (GIMP_TYPE_CHANNEL, 
						 GIMP_CONTAINER_POLICY_STRONG);
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  gimage->layer_stack           = NULL;
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  gimage->active_layer          = NULL;
  gimage->active_channel        = NULL;
  gimage->floating_sel          = NULL;
  gimage->selection_mask        = NULL;

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  gimage->parasites             = gimp_parasite_list_new ();
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  gimage->paths                 = NULL;

  gimage->qmask_state           = FALSE;
  gimage->qmask_color.r         = 1.0;
  gimage->qmask_color.g         = 0.0;
  gimage->qmask_color.b         = 0.0;
  gimage->qmask_color.a         = 0.5;

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  gimage->undo_stack            = NULL;
  gimage->redo_stack            = NULL;
  gimage->undo_bytes            = 0;
  gimage->undo_levels           = 0;
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  gimage->group_count           = 0;
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  gimage->pushing_undo_group    = UNDO_NULL;
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  gimage->new_undo_stack        = gimp_undo_stack_new (gimage);
  gimage->new_redo_stack        = gimp_undo_stack_new (gimage);

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  gimage->comp_preview          = NULL;
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  gimage->comp_preview_valid    = FALSE;
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}

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static void
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gimp_image_dispose (GObject *object)
{
  GimpImage *gimage;

  gimage = GIMP_IMAGE (object);

  undo_free (gimage);

  G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
gimp_image_finalize (GObject *object)
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{
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  GimpImage *gimage;

  gimage = GIMP_IMAGE (object);

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  if (gimage->gimp && gimage->gimp->image_table)
    {
      g_hash_table_remove (gimage->gimp->image_table,
			   GINT_TO_POINTER (gimage->ID));
      gimage->gimp = NULL;
    }

  if (gimage->projection)
    gimp_image_free_projection (gimage);

  if (gimage->shadow)
    gimp_image_free_shadow (gimage);
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  if (gimage->cmap)
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    {
      g_free (gimage->cmap);
      gimage->cmap = NULL;
    }

  if (gimage->layers)
    {
      g_object_unref (G_OBJECT (gimage->layers));
      gimage->layers = NULL;
    }
  if (gimage->channels)
    {
      g_object_unref (G_OBJECT (gimage->channels));
      gimage->channels = NULL;
    }
  if (gimage->layer_stack)
    {
      g_slist_free (gimage->layer_stack);
      gimage->layer_stack = NULL;
    }
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  if (gimage->selection_mask)
    {
      g_object_unref (G_OBJECT (gimage->selection_mask));
      gimage->selection_mask = NULL;
    }
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  if (gimage->comp_preview)
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    {
      temp_buf_free (gimage->comp_preview);
      gimage->comp_preview = NULL;
    }
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  if (gimage->parasites)
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    {
      g_object_unref (G_OBJECT (gimage->parasites));
      gimage->parasites = NULL;
    }
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  if (gimage->guides)
    {
      g_list_foreach (gimage->guides, (GFunc) g_free, NULL);
      g_list_free (gimage->guides);
      gimage->guides = NULL;
    }
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  if (gimage->new_undo_stack)
    {
      g_object_unref (G_OBJECT (gimage->new_undo_stack));
      gimage->new_undo_stack = NULL;
    }
  if (gimage->new_redo_stack)
    {
      g_object_unref (G_OBJECT (gimage->new_redo_stack));
      gimage->new_redo_stack = NULL;
    }

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  G_OBJECT_CLASS (parent_class)->finalize (object);
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}

static void
gimp_image_name_changed (GimpObject *object)
{
  GimpImage   *gimage;
  const gchar *name;

  if (GIMP_OBJECT_CLASS (parent_class)->name_changed)
    GIMP_OBJECT_CLASS (parent_class)->name_changed (object);

  gimage = GIMP_IMAGE (object);
  name   = gimp_object_get_name (object);

  if (! (name && strlen (name)))
    {
      g_free (object->name);
      object->name = NULL;
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    }
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}
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static void
gimp_image_invalidate_preview (GimpViewable *viewable)
{
  GimpImage *gimage;

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  if (GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview)
    GIMP_VIEWABLE_CLASS (parent_class)->invalidate_preview (viewable);

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  gimage = GIMP_IMAGE (viewable);

  gimage->comp_preview_valid = FALSE;
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}

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static void
gimp_image_size_changed (GimpViewable *viewable)
{
  GimpImage *gimage;

  if (GIMP_VIEWABLE_CLASS (parent_class)->size_changed)
    GIMP_VIEWABLE_CLASS (parent_class)->size_changed (viewable);

  gimage = GIMP_IMAGE (viewable);

  gimp_image_invalidate_layer_previews (gimage);
  gimp_image_invalidate_channel_previews (gimage);
}

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static void 
gimp_image_real_colormap_changed (GimpImage *gimage,
				  gint       ncol)
{
  if (gimp_image_base_type (gimage) == INDEXED)
    gimp_image_color_hash_invalidate (gimage, ncol);
}

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static void
gimp_image_allocate_projection (GimpImage *gimage)
{
  if (gimage->projection)
    gimp_image_free_projection (gimage);

  /*  Find the number of bytes required for the projection.
   *  This includes the intensity channels and an alpha channel
   *  if one doesn't exist.
   */
  switch (gimp_image_base_type (gimage))
    {
    case RGB:
    case INDEXED:
      gimage->proj_bytes = 4;
      gimage->proj_type = RGBA_GIMAGE;
      break;
    case GRAY:
      gimage->proj_bytes = 2;
      gimage->proj_type = GRAYA_GIMAGE;
      break;
    default:
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      g_assert_not_reached ();
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    }

  /*  allocate the new projection  */
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  gimage->projection = tile_manager_new (gimage->width, gimage->height,
					 gimage->proj_bytes);
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  tile_manager_set_user_data (gimage->projection, (void *) gimage);
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  tile_manager_set_validate_proc (gimage->projection, gimp_image_validate);
}

static void
gimp_image_free_projection (GimpImage *gimage)
{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));
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  if (gimage->projection)
    {
      tile_manager_destroy (gimage->projection);
      gimage->projection = NULL;
    }
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}

static void
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gimp_image_allocate_shadow (GimpImage *gimage, 
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			    gint       width, 
			    gint       height, 
			    gint       bpp)
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{
  /*  allocate the new projection  */
  gimage->shadow = tile_manager_new (width, height, bpp);
}


/* function definitions */

GimpImage *
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gimp_image_new (Gimp              *gimp,
		gint               width,
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		gint               height,
		GimpImageBaseType  base_type)
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{
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  GimpImage *gimage;
  gint       i;

  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);

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  gimage = GIMP_IMAGE (g_object_new (GIMP_TYPE_IMAGE, NULL));
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  gimage->gimp        = gimp;
  gimage->ID          = gimp->next_image_ID++;

  g_hash_table_insert (gimp->image_table,
		       GINT_TO_POINTER (gimage->ID),
		       (gpointer) gimage);

  gimage->width       = width;
  gimage->height      = height;
  gimage->base_type   = base_type;

  gimage->xresolution = gimp->config->default_xresolution;
  gimage->yresolution = gimp->config->default_yresolution;
  gimage->unit        = gimp->config->default_units;
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  switch (base_type)
    {
    case RGB:
    case GRAY:
      break;
    case INDEXED:
      /* always allocate 256 colors for the colormap */
      gimage->num_cols = 0;
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      gimage->cmap     = (guchar *) g_malloc0 (COLORMAP_SIZE);
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      break;
    default:
      break;
    }

  /*  set all color channels visible and active  */
  for (i = 0; i < MAX_CHANNELS; i++)
    {
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      gimage->visible[i] = TRUE;
      gimage->active[i]  = TRUE;
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    }

  /* create the selection mask */
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  gimage->selection_mask = gimp_channel_new_mask (gimage,
						  gimage->width,
						  gimage->height);
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  return gimage;
}

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gint
gimp_image_get_ID (GimpImage *gimage)
{
  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), -1);

  return gimage->ID;
}

GimpImage *
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gimp_image_get_by_ID (Gimp *gimp,
		      gint  image_id)
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{
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  g_return_val_if_fail (GIMP_IS_GIMP (gimp), NULL);

  if (gimp->image_table == NULL)
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    return NULL;

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  return (GimpImage *) g_hash_table_lookup (gimp->image_table, 
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					    GINT_TO_POINTER (image_id));
}

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void
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gimp_image_set_filename (GimpImage   *gimage,
			 const gchar *filename)
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{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));

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  gimp_object_set_name (GIMP_OBJECT (gimage), filename);
}
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void
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gimp_image_set_resolution (GimpImage *gimage,
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			   gdouble    xresolution,
			   gdouble    yresolution)
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{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));

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  /* don't allow to set the resolution out of bounds */
  if (xresolution < GIMP_MIN_RESOLUTION || xresolution > GIMP_MAX_RESOLUTION ||
      yresolution < GIMP_MIN_RESOLUTION || yresolution > GIMP_MAX_RESOLUTION)
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    return;

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  if ((ABS (gimage->xresolution - xresolution) >= 1e-5) ||
      (ABS (gimage->yresolution - yresolution) >= 1e-5))
    {
      undo_push_resolution (gimage);
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      gimage->xresolution = xresolution;
      gimage->yresolution = yresolution;
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      gimp_image_resolution_changed (gimage);
      gimp_viewable_size_changed (GIMP_VIEWABLE (gimage));
    }
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}

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void
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gimp_image_get_resolution (const GimpImage *gimage,
			   gdouble         *xresolution,
			   gdouble         *yresolution)
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{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));
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  g_return_if_fail (xresolution && yresolution);

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  *xresolution = gimage->xresolution;
  *yresolution = gimage->yresolution;
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}

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void
gimp_image_set_unit (GimpImage *gimage,
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		     GimpUnit   unit)
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{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));

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  if (gimage->unit != unit)
    {
      undo_push_resolution (gimage);

      gimage->unit = unit;
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      gimp_image_unit_changed (gimage);
    }
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}

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GimpUnit
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gimp_image_get_unit (const GimpImage *gimage)
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{
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  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), GIMP_UNIT_INCH);

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  return gimage->unit;
}

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void
gimp_image_set_qmask_state (GimpImage *gimage,
                            gboolean   qmask_state)
{
  g_return_if_fail (GIMP_IS_IMAGE (gimage));

  if (qmask_state != gimage->qmask_state)
    {
      gimage->qmask_state = qmask_state ? TRUE : FALSE;

      gimp_image_qmask_changed (gimage);
    }
}

gboolean
gimp_image_get_qmask_state (const GimpImage *gimage)
{
  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);

  return gimage->qmask_state;
}

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void
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gimp_image_set_save_proc (GimpImage     *gimage, 
			  PlugInProcDef *proc)
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{
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));

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  gimage->save_proc = proc;
}

PlugInProcDef *
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gimp_image_get_save_proc (const GimpImage *gimage)
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{
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  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);

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  return gimage->save_proc;
}
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gint
gimp_image_get_width (const GimpImage *gimage)
{
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  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), 0);

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  return gimage->width;
}

gint
gimp_image_get_height (const GimpImage *gimage)
{
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  g_return_val_if_fail (GIMP_IS_IMAGE (gimage), 0);

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  return gimage->height;
}

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void
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gimp_image_resize (GimpImage *gimage, 
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		   gint       new_width, 
		   gint       new_height,
		   gint       offset_x, 
		   gint       offset_y)
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{
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  GimpChannel *channel;
  GimpLayer   *layer;
  GimpLayer   *floating_layer;
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  GList       *list;
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  GList       *guide_list;
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  g_return_if_fail (GIMP_IS_IMAGE (gimage));
  g_return_if_fail (new_width > 0 && new_height > 0);
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  gimp_set_busy (gimage->gimp);
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  /*  Get the floating layer if one exists  */
  floating_layer = gimp_image_floating_sel (gimage);

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  undo_push_group_start (gimage, IMAGE_RESIZE_UNDO);
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  /*  Relax the floating selection  */
  if (floating_layer)
    floating_sel_relax (floating_layer, TRUE);

  /*  Push the image size to the stack  */
  undo_push_gimage_mod (gimage);

  /*  Set the new width and height  */
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  gimage->width  = new_width;
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  gimage->height = new_height;

  /*  Resize all channels  */
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  for (list = GIMP_LIST (gimage->channels)->list; 
       list; 
       list = g_list_next (list))
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    {
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      channel = (GimpChannel *) list->data;
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      gimp_channel_resize (channel, new_width, new_height, offset_x, offset_y);
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