gimpimage-resize.c 91.2 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 <string.h>
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#include "gimpimageP.h"
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#include "cursorutil.h"
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#include "drawable.h"
#include "floating_sel.h"
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#include "gdisplay.h"
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#include "general.h"
#include "gimage_mask.h"
#include "paint_funcs.h"
#include "palette.h"
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#include "libgimp/parasite.h"
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#include "parasitelist.h"
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#include "undo.h"
#include "gimpsignal.h"
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#include "gimpparasite.h"
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#include "pathsP.h"
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#include "gimprc.h"
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#include "libgimp/gimpintl.h"

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#include "tile_manager.h"
#include "tile.h"
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#include "layer_pvt.h"
#include "drawable_pvt.h"		/* ick ick. */

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/*  Local function declarations  */
static void     gimp_image_free_projection       (GimpImage *);
static void     gimp_image_allocate_shadow       (GimpImage *, int, int, int);
static void     gimp_image_allocate_projection   (GimpImage *);
static void     gimp_image_free_layers           (GimpImage *);
static void     gimp_image_free_channels         (GimpImage *);
static void     gimp_image_construct_layers      (GimpImage *, int, int, int, int);
static void     gimp_image_construct_channels    (GimpImage *, int, int, int, int);
static void     gimp_image_initialize_projection (GimpImage *, int, int, int, int);
static void     gimp_image_get_active_channels   (GimpImage *, GimpDrawable *, int *);

/*  projection functions  */
static void     project_intensity            (GimpImage *, Layer *, PixelRegion *,
					      PixelRegion *, PixelRegion *);
static void     project_intensity_alpha      (GimpImage *, Layer *, PixelRegion *,
					      PixelRegion *, PixelRegion *);
static void     project_indexed              (GimpImage *, Layer *, PixelRegion *,
					      PixelRegion *);
static void     project_channel              (GimpImage *, Channel *, PixelRegion *,
					      PixelRegion *);

/*
 *  Global variables
 */
int valid_combinations[][MAX_CHANNELS + 1] =
{
  /* 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 },
};

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guint32 next_guide_id = 1; /* For generating guide_ID handles for PDB stuff */

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/*
 *  Static variables
 */

enum{
  DIRTY,
  REPAINT,
  RENAME,
  RESIZE,
  RESTRUCTURE,
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  COLORMAP_CHANGED,
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  LAST_SIGNAL
};
static void            gimp_image_destroy                 (GtkObject *);

static guint gimp_image_signals[LAST_SIGNAL];
static GimpObjectClass* parent_class;

static void
gimp_image_class_init (GimpImageClass *klass)
{
  GtkObjectClass *object_class;
  GtkType type;
  
  object_class = GTK_OBJECT_CLASS(klass);
  parent_class = gtk_type_class (gimp_object_get_type ());
  
  type=object_class->type;

  object_class->destroy =  gimp_image_destroy;

  gimp_image_signals[DIRTY] =
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	  gimp_signal_new ("dirty", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_void);
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  gimp_image_signals[REPAINT] =
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	  gimp_signal_new ("repaint", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_int_int_int_int);
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  gimp_image_signals[RENAME] =
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	  gimp_signal_new ("rename", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_void);
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  gimp_image_signals[RESIZE] =
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	  gimp_signal_new ("resize", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_void);
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  gimp_image_signals[RESTRUCTURE] =
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	  gimp_signal_new ("restructure", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_void);
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  gimp_image_signals[COLORMAP_CHANGED] =
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	  gimp_signal_new ("colormap_changed", GTK_RUN_FIRST, type, 0,
			   gimp_sigtype_int);
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  gtk_object_class_add_signals (object_class, gimp_image_signals, LAST_SIGNAL);
}


/* static functions */

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static void 
gimp_image_init (GimpImage *gimage)
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{
  gimage->has_filename = 0;
  gimage->num_cols = 0;
  gimage->cmap = NULL;
  /* ID and ref_count handled in gimage.c */
  gimage->instance_count = 0;
  gimage->shadow = NULL;
  gimage->dirty = 1;
  gimage->undo_on = TRUE;
  gimage->construct_flag = -1;
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  gimage->tattoo_state = 0;
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  gimage->projection = NULL;
  gimage->guides = NULL;
  gimage->layers = NULL;
  gimage->channels = NULL;
  gimage->layer_stack = NULL;
  gimage->undo_stack = NULL;
  gimage->redo_stack = NULL;
  gimage->undo_bytes = 0;
  gimage->undo_levels = 0;
  gimage->pushing_undo_group = 0;
  gimage->comp_preview_valid[0] = FALSE;
  gimage->comp_preview_valid[1] = FALSE;
  gimage->comp_preview_valid[2] = FALSE;
  gimage->comp_preview = NULL;
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  gimage->parasites = parasite_list_new();
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  gimage->xresolution = default_xresolution;
  gimage->yresolution = default_yresolution;
  gimage->unit = default_units;
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  gimage->save_proc= NULL;
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  gimage->paths = NULL;
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}

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GtkType 
gimp_image_get_type (void) 
{
  static GtkType type;

  GIMP_TYPE_INIT(type,
		 GimpImage,
		 GimpImageClass,
		 gimp_image_init,
		 gimp_image_class_init,
		 GIMP_TYPE_OBJECT);
  return type;
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}


/* static functions */

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  */
  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)
{
  if (gimage->projection)
    tile_manager_destroy (gimage->projection);

  gimage->projection = NULL;
}

static void
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gimp_image_allocate_shadow (GimpImage *gimage, 
			    int        width, 
			    int        height, 
			    int        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 (int width, 
		int height, 
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		GimpImageBaseType base_type)
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{
  GimpImage *gimage=GIMP_IMAGE(gtk_type_new(gimp_image_get_type ()));
  int i;

  gimage->filename = NULL;
  gimage->width = width;
  gimage->height = height;

  gimage->base_type = base_type;

  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 = (unsigned char *) g_malloc0 (COLORMAP_SIZE);
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      break;
    default:
      break;
    }

  /*  configure the active pointers  */
  gimage->active_layer = NULL;
  gimage->active_channel = NULL;  /* no default active channel */
  gimage->floating_sel = NULL;

  /*  set all color channels visible and active  */
  for (i = 0; i < MAX_CHANNELS; i++)
    {
      gimage->visible[i] = 1;
      gimage->active[i] = 1;
    }

  /* create the selection mask */
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  gimage->selection_mask = channel_new_mask (gimage, gimage->width, gimage->height);
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  /* set the qmask properties */
  gimage->qmask_state = FALSE;
  gimage->qmask_opacity = 50;
  gimage->qmask_color[0] = 255; 
  gimage->qmask_color[1] = 0; 
  gimage->qmask_color[2] = 0; 
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  return gimage;
}


void
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gimp_image_set_filename (GimpImage *gimage, 
			 char      *filename)
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{
  char *new_filename;

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  /* 
   * WARNING: this function will free the current filename even if you are 
   * setting it to itself so any pointer you hold to the filename will be
   * invalid after this call.  So please use with care.
   */

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  new_filename = g_strdup (filename);
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  if (gimage->has_filename)
    g_free (gimage->filename);

  if (filename && filename[0])
    {
      gimage->filename = new_filename;
      gimage->has_filename = TRUE;
    }
  else
    {
      gimage->filename = NULL;
      gimage->has_filename = FALSE;
    }

  gtk_signal_emit (GTK_OBJECT (gimage), gimp_image_signals[RENAME]);
}


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void
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gimp_image_set_resolution (GimpImage *gimage,
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			   double     xresolution,
			   double     yresolution)
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{
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  gimage->xresolution = xresolution;
  gimage->yresolution = yresolution;
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}

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void
gimp_image_get_resolution (GimpImage *gimage,
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			   double    *xresolution,
			   double    *yresolution)
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{
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  g_return_if_fail(xresolution && yresolution);
  *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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		     GUnit      unit)
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{
  gimage->unit = unit;
}

GUnit
gimp_image_get_unit (GimpImage *gimage)
{
  return gimage->unit;
}


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void
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gimp_image_set_save_proc (GimpImage     *gimage, 
			  PlugInProcDef *proc)
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{
  gimage->save_proc = proc;
}

PlugInProcDef *
gimp_image_get_save_proc (GimpImage *gimage)
{
  return gimage->save_proc;
}
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void
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gimp_image_resize (GimpImage *gimage, 
		   int        new_width, 
		   int        new_height,
		   int        offset_x, 
		   int        offset_y)
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{
  Channel *channel;
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  Layer   *layer;
  Layer   *floating_layer;
  GSList  *list;
  GList   *guide_list;
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  gimp_add_busy_cursors();

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  g_assert (new_width > 0 && new_height > 0);
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  /*  Get the floating layer if one exists  */
  floating_layer = gimp_image_floating_sel (gimage);

  undo_push_group_start (gimage, GIMAGE_MOD_UNDO);

  /*  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  */
  gimage->width = new_width;
  gimage->height = new_height;

  /*  Resize all channels  */
  list = gimage->channels;
  while (list)
    {
      channel = (Channel *) list->data;
      channel_resize (channel, new_width, new_height, offset_x, offset_y);
      list = g_slist_next (list);
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    }

  /*  Reposition or remove any guides  */
  guide_list = gimage->guides;
  while (guide_list)
    {
      Guide *guide;

      guide = (Guide*) guide_list->data;
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      guide_list = g_list_next (guide_list);
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      switch (guide->orientation)
	{
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	case ORIENTATION_HORIZONTAL:
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	  guide->position += offset_y;
	  if (guide->position < 0 || guide->position > new_height)
	    gimp_image_delete_guide (gimage, guide);
	  break;
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	case ORIENTATION_VERTICAL:
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	  guide->position += offset_x;
	  if (guide->position < 0 || guide->position > new_width)
	    gimp_image_delete_guide (gimage, guide);
	  break;
	default:
	  g_error("Unknown guide orientation I.\n");
	}
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    }

  /*  Don't forget the selection mask!  */
  channel_resize (gimage->selection_mask, new_width, new_height, offset_x, offset_y);
  gimage_mask_invalidate (gimage);

  /*  Reposition all layers  */
  list = gimage->layers;
  while (list)
    {
      layer = (Layer *) list->data;
      layer_translate (layer, offset_x, offset_y);
      list = g_slist_next (list);
    }

  /*  Make sure the projection matches the gimage size  */
  gimp_image_projection_realloc (gimage);

  /*  Rigor the floating selection  */
  if (floating_layer)
    floating_sel_rigor (floating_layer, TRUE);

  gtk_signal_emit (GTK_OBJECT (gimage), gimp_image_signals[RESIZE]);
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  gimp_remove_busy_cursors(NULL);
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}


void
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gimp_image_scale (GimpImage *gimage, 
		  int        new_width, 
		  int        new_height)
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{
  Channel *channel;
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  Layer   *layer;
  Layer   *floating_layer;
  GSList  *list;
  GList   *glist;
  Guide   *guide;
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  int old_width, old_height;
  int layer_width, layer_height;

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  gimp_add_busy_cursors();

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  /*  Get the floating layer if one exists  */
  floating_layer = gimp_image_floating_sel (gimage);

  undo_push_group_start (gimage, GIMAGE_MOD_UNDO);

  /*  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  */
  old_width = gimage->width;
  old_height = gimage->height;
  gimage->width = new_width;
  gimage->height = new_height;

  /*  Scale all channels  */
  list = gimage->channels;
  while (list)
    {
      channel = (Channel *) list->data;
      channel_scale (channel, new_width, new_height);
      list = g_slist_next (list);
    }

  /*  Don't forget the selection mask!  */
  channel_scale (gimage->selection_mask, new_width, new_height);
  gimage_mask_invalidate (gimage);

  /*  Scale all layers  */
  list = gimage->layers;
  while (list)
    {
      layer = (Layer *) list->data;

      layer_width = (new_width * drawable_width (GIMP_DRAWABLE(layer))) / old_width;
      layer_height = (new_height * drawable_height (GIMP_DRAWABLE(layer))) / old_height;
      layer_scale (layer, layer_width, layer_height, FALSE);
      list = g_slist_next (list);
    }

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  /*  Scale any Guides  */
  glist = gimage->guides;
  while (glist)
    {
      guide = (Guide*) glist->data;
      glist = g_list_next (glist);

      switch (guide->orientation)
	{
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	case ORIENTATION_HORIZONTAL:
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	  guide->position = (guide->position * new_height) / old_height;
	  break;
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	case ORIENTATION_VERTICAL:
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	  guide->position = (guide->position * new_width) / old_width;
	  break;
	default:
	  g_error("Unknown guide orientation II.\n");
	}
    }
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  /*  Make sure the projection matches the gimage size  */
  gimp_image_projection_realloc (gimage);

  /*  Rigor the floating selection  */
  if (floating_layer)
    floating_sel_rigor (floating_layer, TRUE);

  gtk_signal_emit (GTK_OBJECT (gimage), gimp_image_signals[RESIZE]);
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  gimp_remove_busy_cursors(NULL);
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}



TileManager *
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gimp_image_shadow (GimpImage *gimage, 
		   int        width, 
		   int        height, 
		   int        bpp)
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{
  if (gimage->shadow &&
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      ((width != tile_manager_level_width (gimage->shadow)) ||
       (height != tile_manager_level_height (gimage->shadow)) ||
       (bpp != tile_manager_level_bpp (gimage->shadow))))
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    gimp_image_free_shadow (gimage);
  else if (gimage->shadow)
    return gimage->shadow;

  gimp_image_allocate_shadow (gimage, width, height, bpp);

  return gimage->shadow;
}


void
gimp_image_free_shadow (GimpImage *gimage)
{
  /*  Free the shadow buffer from the specified gimage if it exists  */
  if (gimage->shadow)
    tile_manager_destroy (gimage->shadow);

  gimage->shadow = NULL;
}


static void
gimp_image_destroy (GtkObject *object)
{
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  GimpImage* gimage = GIMP_IMAGE(object);

  gimp_image_free_projection (gimage);
  gimp_image_free_shadow (gimage);
  
  if (gimage->cmap)
    g_free (gimage->cmap);
  
  if (gimage->has_filename)
    g_free (gimage->filename);
  
  gimp_image_free_layers (gimage);
  gimp_image_free_channels (gimage);
  channel_delete (gimage->selection_mask);
  if (gimage->parasites)
    gtk_object_unref(GTK_OBJECT(gimage->parasites));
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}

void
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gimp_image_apply_image (GimpImage	*gimage, 
			GimpDrawable	*drawable, 
			PixelRegion	*src2PR,
			int		 undo, 
			int		 opacity, 
			LayerModeEffects mode,
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			/*  alternative to using drawable tiles as src1: */
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			TileManager	*src1_tiles,
			int		 x, 
			int		 y)
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{
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  Channel *mask;
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  int x1, y1, x2, y2;
  int offset_x, offset_y;
  PixelRegion src1PR, destPR, maskPR;
  int operation;
  int active [MAX_CHANNELS];

  /*  get the selection mask if one exists  */
  mask = (gimage_mask_is_empty (gimage)) ?
    NULL : gimp_image_get_mask (gimage);

  /*  configure the active channel array  */
  gimp_image_get_active_channels (gimage, drawable, active);

  /*  determine what sort of operation is being attempted and
   *  if it's actually legal...
   */
  operation = valid_combinations [drawable_type (drawable)][src2PR->bytes];
  if (operation == -1)
    {
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      g_message (_("gimp_image_apply_image sent illegal parameters"));
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      return;
    }

  /*  get the layer offsets  */
  drawable_offsets (drawable, &offset_x, &offset_y);

  /*  make sure the image application coordinates are within gimage bounds  */
  x1 = CLAMP (x, 0, drawable_width (drawable));
  y1 = CLAMP (y, 0, drawable_height (drawable));
  x2 = CLAMP (x + src2PR->w, 0, drawable_width (drawable));
  y2 = CLAMP (y + src2PR->h, 0, drawable_height (drawable));

  if (mask)
    {
      /*  make sure coordinates are in mask bounds ...
       *  we need to add the layer offset to transform coords
       *  into the mask coordinate system
       */
      x1 = CLAMP (x1, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y1 = CLAMP (y1, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
      x2 = CLAMP (x2, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y2 = CLAMP (y2, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
    }

  /*  If the calling procedure specified an undo step...  */
  if (undo)
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    undo_push_image (gimp_drawable_gimage(drawable), drawable, x1, y1, x2, y2);
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  /* configure the pixel regions
   *  If an alternative to using the drawable's data as src1 was provided...
   */
  if (src1_tiles)
    pixel_region_init (&src1PR, src1_tiles, x1, y1, (x2 - x1), (y2 - y1), FALSE);
  else
    pixel_region_init (&src1PR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
  pixel_region_init (&destPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
  pixel_region_resize (src2PR, src2PR->x + (x1 - x), src2PR->y + (y1 - y), (x2 - x1), (y2 - y1));

  if (mask)
    {
      int mx, my;

      /*  configure the mask pixel region
       *  don't use x1 and y1 because they are in layer
       *  coordinate system.  Need mask coordinate system
       */
      mx = x1 + offset_x;
      my = y1 + offset_y;

      pixel_region_init (&maskPR, drawable_data (GIMP_DRAWABLE(mask)), mx, my, (x2 - x1), (y2 - y1), FALSE);
      combine_regions (&src1PR, src2PR, &destPR, &maskPR, NULL,
		       opacity, mode, active, operation);
    }
  else
    combine_regions (&src1PR, src2PR, &destPR, NULL, NULL,
		     opacity, mode, active, operation);
}

/* Similar to gimp_image_apply_image but works in "replace" mode (i.e.
   transparent pixels in src2 make the result transparent rather
   than opaque.

   Takes an additional mask pixel region as well.

*/
void
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gimp_image_replace_image (GimpImage    *gimage, 
			  GimpDrawable *drawable, 
			  PixelRegion  *src2PR,
			  int           undo, 
			  int           opacity,
			  PixelRegion  *maskPR,
			  int           x, 
			  int           y)
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{
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  Channel *mask;
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  int x1, y1, x2, y2;
  int offset_x, offset_y;
  PixelRegion src1PR, destPR;
  PixelRegion mask2PR, tempPR;
  unsigned char *temp_data;
  int operation;
  int active [MAX_CHANNELS];

  /*  get the selection mask if one exists  */
  mask = (gimage_mask_is_empty (gimage)) ?
    NULL : gimp_image_get_mask (gimage);

  /*  configure the active channel array  */
  gimp_image_get_active_channels (gimage, drawable, active);

  /*  determine what sort of operation is being attempted and
   *  if it's actually legal...
   */
  operation = valid_combinations [drawable_type (drawable)][src2PR->bytes];
  if (operation == -1)
    {
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      g_message (_("gimp_image_apply_image sent illegal parameters"));
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      return;
    }

  /*  get the layer offsets  */
  drawable_offsets (drawable, &offset_x, &offset_y);

  /*  make sure the image application coordinates are within gimage bounds  */
  x1 = CLAMP (x, 0, drawable_width (drawable));
  y1 = CLAMP (y, 0, drawable_height (drawable));
  x2 = CLAMP (x + src2PR->w, 0, drawable_width (drawable));
  y2 = CLAMP (y + src2PR->h, 0, drawable_height (drawable));

  if (mask)
    {
      /*  make sure coordinates are in mask bounds ...
       *  we need to add the layer offset to transform coords
       *  into the mask coordinate system
       */
      x1 = CLAMP (x1, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y1 = CLAMP (y1, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
      x2 = CLAMP (x2, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y2 = CLAMP (y2, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
    }

  /*  If the calling procedure specified an undo step...  */
  if (undo)
    drawable_apply_image (drawable, x1, y1, x2, y2, NULL, FALSE);

  /* configure the pixel regions
   *  If an alternative to using the drawable's data as src1 was provided...
   */
  pixel_region_init (&src1PR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), FALSE);
  pixel_region_init (&destPR, drawable_data (drawable), x1, y1, (x2 - x1), (y2 - y1), TRUE);
  pixel_region_resize (src2PR, src2PR->x + (x1 - x), src2PR->y + (y1 - y), (x2 - x1), (y2 - y1));

  if (mask)
    {
      int mx, my;

      /*  configure the mask pixel region
       *  don't use x1 and y1 because they are in layer
       *  coordinate system.  Need mask coordinate system
       */
      mx = x1 + offset_x;
      my = y1 + offset_y;

      pixel_region_init (&mask2PR, drawable_data (GIMP_DRAWABLE(mask)), mx, my, (x2 - x1), (y2 - y1), FALSE);

      tempPR.bytes = 1;
      tempPR.x = 0;
      tempPR.y = 0;
      tempPR.w = x2 - x1;
      tempPR.h = y2 - y1;
      tempPR.rowstride = mask2PR.rowstride;
      temp_data = g_malloc (tempPR.h * tempPR.rowstride);
      tempPR.data = temp_data;

      copy_region (&mask2PR, &tempPR);

      /* apparently, region operations can mutate some PR data. */
      tempPR.x = 0;
      tempPR.y = 0;
      tempPR.w = x2 - x1;
      tempPR.h = y2 - y1;
      tempPR.data = temp_data;

      apply_mask_to_region (&tempPR, maskPR, OPAQUE_OPACITY);

      tempPR.x = 0;
      tempPR.y = 0;
      tempPR.w = x2 - x1;
      tempPR.h = y2 - y1;
      tempPR.data = temp_data;

      combine_regions_replace (&src1PR, src2PR, &destPR, &tempPR, NULL,
		       opacity, active, operation);

      g_free (temp_data);
    }
  else
    combine_regions_replace (&src1PR, src2PR, &destPR, maskPR, NULL,
		     opacity, active, operation);
}

/* Get rid of these! A "foreground" is an UI concept.. */

void
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gimp_image_get_foreground (GimpImage     *gimage, 
			   GimpDrawable  *drawable, 
			   unsigned char *fg)
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{
  unsigned char pfg[3];

  /*  Get the palette color  */
  palette_get_foreground (&pfg[0], &pfg[1], &pfg[2]);

  gimp_image_transform_color (gimage, drawable, pfg, fg, RGB);
}


void
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gimp_image_get_background (GimpImage     *gimage, 
			   GimpDrawable  *drawable, 
			   unsigned char *bg)
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{
  unsigned char pbg[3];

  /*  Get the palette color  */
  palette_get_background (&pbg[0], &pbg[1], &pbg[2]);

  gimp_image_transform_color (gimage, drawable, pbg, bg, RGB);
}

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unsigned char *
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gimp_image_get_color_at (GimpImage *gimage, 
			 int        x, 
			 int        y)
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{
  Tile *tile;
  unsigned char *src;
  unsigned char *dest;

  if (x < 0 || y < 0 || x >= gimage->width || y >= gimage->height)
  {
    return NULL;
  }
  dest = g_new(unsigned char, 5);
  tile = tile_manager_get_tile (gimp_image_composite (gimage), x, y,
				TRUE, FALSE);
  src = tile_data_pointer (tile, x % TILE_WIDTH, y % TILE_HEIGHT);
  gimp_image_get_color (gimage, gimp_image_composite_type (gimage), dest, src);
  if(TYPE_HAS_ALPHA(gimp_image_composite_type (gimage)))
    dest[3] = src[gimp_image_composite_bytes (gimage) - 1];
  else
    dest[3] = 255;
  dest[4] = 0;
  tile_release (tile, FALSE);
  return dest;
}

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void
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gimp_image_get_color (GimpImage     *gimage, 
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		      GimpImageType  d_type,
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		      unsigned char *rgb, 
		      unsigned char *src)
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{
  switch (d_type)
    {
    case RGB_GIMAGE: case RGBA_GIMAGE:
      map_to_color (0, NULL, src, rgb);
      break;
    case GRAY_GIMAGE: case GRAYA_GIMAGE:
      map_to_color (1, NULL, src, rgb);
      break;
    case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
      map_to_color (2, gimage->cmap, src, rgb);
      break;
    }
}


void
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gimp_image_transform_color (GimpImage        *gimage, 
			    GimpDrawable     *drawable,
			    unsigned char    *src, 
			    unsigned char    *dest, 
			    GimpImageBaseType type)
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{
#define INTENSITY(r,g,b) (r * 0.30 + g * 0.59 + b * 0.11 + 0.001)
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  GimpImageType d_type;
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  d_type = (drawable != NULL) ? drawable_type (drawable) :
    gimp_image_base_type_with_alpha (gimage);

  switch (type)
    {
    case RGB:
      switch (d_type)
	{
	case RGB_GIMAGE: case RGBA_GIMAGE:
	  /*  Straight copy  */
	  *dest++ = *src++;
	  *dest++ = *src++;
	  *dest++ = *src++;
	  break;
	case GRAY_GIMAGE: case GRAYA_GIMAGE:
	  /*  NTSC conversion  */
	  *dest = INTENSITY (src[RED_PIX],
			     src[GREEN_PIX],
			     src[BLUE_PIX]);
	  break;
	case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
	  /*  Least squares method  */
	  *dest = map_rgb_to_indexed (gimage->cmap,
				      gimage->num_cols,
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				      gimage,
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				      src[RED_PIX],
				      src[GREEN_PIX],
				      src[BLUE_PIX]);
	  break;
	}
      break;
    case GRAY:
      switch (d_type)
	{
	case RGB_GIMAGE: case RGBA_GIMAGE:
	  /*  Gray to RG&B */
	  *dest++ = *src;
	  *dest++ = *src;
	  *dest++ = *src;
	  break;
	case GRAY_GIMAGE: case GRAYA_GIMAGE:
	  /*  Straight copy  */
	  *dest = *src;
	  break;
	case INDEXED_GIMAGE: case INDEXEDA_GIMAGE:
	  /*  Least squares method  */
	  *dest = map_rgb_to_indexed (gimage->cmap,
				      gimage->num_cols,
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				      gimage,
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				      src[GRAY_PIX],
				      src[GRAY_PIX],
				      src[GRAY_PIX]);
	  break;
	}
      break;
    default:
      break;
    }
}

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Guide*
gimp_image_add_hguide (GimpImage *gimage)
{
  Guide *guide;

  guide = g_new (Guide, 1);
  guide->ref_count = 0;
  guide->position = -1;
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  guide->guide_ID = next_guide_id++;
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  guide->orientation = ORIENTATION_HORIZONTAL;
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  gimage->guides = g_list_prepend (gimage->guides, guide);

  return guide;
}

Guide*
gimp_image_add_vguide (GimpImage *gimage)
{
  Guide *guide;

  guide = g_new (Guide, 1);
  guide->ref_count = 0;
  guide->position = -1;
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  guide->guide_ID = next_guide_id++;
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  guide->orientation = ORIENTATION_VERTICAL;
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  gimage->guides = g_list_prepend (gimage->guides, guide);

  return guide;
}

void
gimp_image_add_guide (GimpImage *gimage,
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		      Guide     *guide)
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{
  gimage->guides = g_list_prepend (gimage->guides, guide);
}

void
gimp_image_remove_guide (GimpImage *gimage,
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			 Guide     *guide)
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{
  gimage->guides = g_list_remove (gimage->guides, guide);
}

void
gimp_image_delete_guide (GimpImage *gimage,
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			 Guide     *guide) 
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{
  gimage->guides = g_list_remove (gimage->guides, guide);
  g_free (guide);
}


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Parasite *
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gimp_image_find_parasite (const GimpImage *gimage, 
			  const char      *name)
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{
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  return parasite_list_find(gimage->parasites, name);
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}

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static void list_func (char       *key, 
		       Parasite   *p, 
		       char     ***cur)
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{
  *(*cur)++ = (char *) g_strdup (key);
}

char **
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gimp_image_parasite_list (GimpImage *image, 
			  gint      *count)
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{
  char **list, **cur;

  *count = parasite_list_length (image->parasites);
  cur = list = (char **) g_malloc (sizeof (char *) * *count);

  parasite_list_foreach (image->parasites, (GHFunc)list_func, &cur);
  
  return list;
}

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void
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gimp_image_attach_parasite (GimpImage *gimage, 
			    Parasite  *parasite)
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{
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  /* only set the dirty bit manually if we can be saved and the new
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     parasite differs from the current one and we aren't undoable */
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  if (parasite_is_undoable(parasite))
    undo_push_image_parasite (gimage, parasite);
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  if (parasite_is_persistent(parasite)
      && !parasite_compare(parasite, gimp_image_find_parasite(gimage,
						 parasite_name(parasite))))
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    gimp_image_dirty(gimage);
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  parasite_list_add(gimage->parasites, parasite);
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  if (parasite_has_flag(parasite, PARASITE_ATTACH_PARENT))
  {
    parasite_shift_parent(parasite);
    gimp_attach_parasite(parasite);
  }
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}

void
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gimp_image_detach_parasite (GimpImage  *gimage, 
			    const char *parasite)
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{
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  Parasite *p;
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  if (!(p = parasite_list_find(gimage->parasites, parasite)))
    return;
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  if (parasite_is_undoable(p))
    undo_push_image_parasite_remove (gimage, parasite_name(p));
  else if (parasite_is_persistent(p))
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    gimp_image_dirty(gimage);
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  parasite_list_remove(gimage->parasites, parasite);
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}

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gimp_image_get_new_tattoo (GimpImage *image)
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{
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  image->tattoo_state++;
  if (image->tattoo_state <= 0)
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    g_warning("Tattoo state has become corrupt (2.1 billion operation limit exceded)");
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  return (image->tattoo_state);
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}

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void
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gimp_image_colormap_changed (GimpImage *image, 
			     gint       col)
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{
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  g_return_if_fail (image);
  g_return_if_fail (col < image->num_cols);
  gtk_signal_emit (GTK_OBJECT(image),
			 gimp_image_signals[COLORMAP_CHANGED],
			 col);
}
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void
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gimp_image_set_paths (GimpImage *gimage,
		      PathsList *paths)
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{
  gimage->paths = paths;
}

PathsList *
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gimp_image_get_paths (GimpImage *gimage)
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{
  return gimage->paths;
}
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/************************************************************/
/*  Projection functions                                    */
/************************************************************/

static void
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project_intensity (GimpImage   *gimage, 
		   Layer       *layer,
		   PixelRegion *src, 
		   PixelRegion *dest, 
		   PixelRegion *mask)
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{
  if (! gimage->construct_flag)
    initial_region (src, dest, mask, NULL, layer->opacity,
		    layer->mode, gimage->visible, INITIAL_INTENSITY);
  else
    combine_regions (dest, src, dest, mask, NULL, layer->opacity,
		     layer->mode, gimage->visible, COMBINE_INTEN_A_INTEN);
}


static void
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project_intensity_alpha (GimpImage   *gimage, 
			 Layer       *layer,
			 PixelRegion *src, 
			 PixelRegion *dest,
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			 PixelRegion *mask)
{
  if (! gimage->construct_flag)
    initial_region (src, dest, mask, NULL, layer->opacity,
		    layer->mode, gimage->visible, INITIAL_INTENSITY_ALPHA);
  else
    combine_regions (dest, src, dest, mask, NULL, layer->opacity,
		     layer->mode, gimage->visible, COMBINE_INTEN_A_INTEN_A);
}


static void
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project_indexed (GimpImage   *gimage, 
		 Layer       *layer,
		 PixelRegion *src, 
		 PixelRegion *dest)
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{
  if (! gimage->construct_flag)
    initial_region (src, dest, NULL, gimage->cmap, layer->opacity,
		    layer->mode, gimage->visible, INITIAL_INDEXED);
  else
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    g_message (_("Unable to project indexed image."));
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}


static void
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project_indexed_alpha (GimpImage   *gimage, 
		       Layer       *layer,
		       PixelRegion *src, 
		       PixelRegion *dest,
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		       PixelRegion *mask)
{
  if (! gimage->construct_flag)
    initial_region (src, dest, mask, gimage->cmap, layer->opacity,
		    layer->mode, gimage->visible, INITIAL_INDEXED_ALPHA);
  else
    combine_regions (dest, src, dest, mask, gimage->cmap, layer->opacity,
		     layer->mode, gimage->visible, COMBINE_INTEN_A_INDEXED_A);
}


static void
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project_channel (GimpImage   *gimage, 
		 Channel     *channel,
		 PixelRegion *src, 
		 PixelRegion *src2)
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{
  int type;

  if (! gimage->construct_flag)
    {
      type = (channel->show_masked) ?
	INITIAL_CHANNEL_MASK : INITIAL_CHANNEL_SELECTION;
      initial_region (src2, src, NULL, channel->col, channel->opacity,
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		      NORMAL_MODE, NULL, type);
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    }
  else
    {
      type = (channel->show_masked) ?
	COMBINE_INTEN_A_CHANNEL_MASK : COMBINE_INTEN_A_CHANNEL_SELECTION;
      combine_regions (src, src2, src, NULL, channel->col, channel->opacity,
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		       NORMAL_MODE, NULL, type);
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    }
}


/************************************************************/
/*  Layer/Channel functions                                 */
/************************************************************/


static void
gimp_image_free_layers (GimpImage *gimage)
{
  GSList *list = gimage->layers;
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  Layer  *layer;
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  while (list)
    {
      layer = (Layer *) list->data;
      layer_delete (layer);
      list = g_slist_next (list);
    }
  g_slist_free (gimage->layers);
  g_slist_free (gimage->layer_stack);
}


static void
gimp_image_free_channels (GimpImage *gimage)
{
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  GSList  *list = gimage->channels;
  Channel *channel;
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  while (list)
    {
      channel = (Channel *) list->data;
      channel_delete (channel);
      list = g_slist_next (list);
    }
  g_slist_free (gimage->channels);
}


static void
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gimp_image_construct_layers (GimpImage *gimage, 
			     int        x, 
			     int        y, 
			     int        w, 
			     int        h)
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{
  Layer * layer;
  int x1, y1, x2, y2;
  PixelRegion src1PR, src2PR, maskPR;
  PixelRegion * mask;
  GSList *list = gimage->layers;
  GSList *reverse_list = NULL;
  int off_x, off_y;

  /*  composite the floating selection if it exists  */
  if ((layer = gimp_image_floating_sel (gimage)))
    floating_sel_composite (layer, x, y, w, h, FALSE);

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  if (!list)
    {
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      /*      g_warning("g_i_c_l on layerless image."); */
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    }

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  /* Note added by Raph Levien, 27 Jan 1998

     This looks it was intended as an optimization, but it seems to
     have correctness problems. In particular, if all channels are
     turned off, the screen simply does not update the projected
     image. It should be black. Turning off this optimization seems to
     restore correct behavior. At some future point, it may be
     desirable to turn the optimization back on.

     */
#if 0
  /*  If all channels are not visible, simply return  */
  switch (gimp_image_base_type (gimage))
    {
    case RGB:
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      if (! gimp_image_get_component_visible (gimage, RED_CHANNEL) &&
	  ! gimp_image_get_component_visible (gimage, GREEN_CHANNEL) &&
	  ! gimp_image_get_component_visible (gimage, BLUE_CHANNEL))
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	return;
      break;
    case GRAY:
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      if (! gimp_image_get_component_visible (gimage, GRAY_CHANNEL))
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	return;
      break;
    case INDEXED: