gimage.c 74.8 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <math.h>
#include "appenv.h"
#include "channels_dialog.h"
#include "drawable.h"
#include "errors.h"
#include "floating_sel.h"
#include "gdisplay.h"
#include "general.h"
#include "gimage.h"
#include "gimage_mask.h"
#include "indexed_palette.h"
#include "interface.h"
#include "layers_dialog.h"
#include "paint_funcs.h"
#include "palette.h"
#include "plug_in.h"
#include "undo.h"

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#include "tile_manager_pvt.h"		/* ick. */
#include "layer_pvt.h"
#include "drawable_pvt.h"		/* ick ick. */

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/*  Local function declarations  */
static void     gimage_free_projection       (GImage *);
static void     gimage_allocate_shadow       (GImage *, int, int, int);
static GImage * gimage_create                (void);
static void     gimage_allocate_projection   (GImage *);
static void     gimage_free_layers           (GImage *);
static void     gimage_free_channels         (GImage *);
static void     gimage_construct_layers      (GImage *, int, int, int, int);
static void     gimage_construct_channels    (GImage *, int, int, int, int);
static void     gimage_initialize_projection (GImage *, int, int, int, int);
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static void     gimage_get_active_channels   (GImage *, GimpDrawable *, int *);
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/*  projection functions  */
static void     project_intensity            (GImage *, Layer *, PixelRegion *,
					      PixelRegion *, PixelRegion *);
static void     project_intensity_alpha      (GImage *, Layer *, PixelRegion *,
					      PixelRegion *, PixelRegion *);
static void     project_indexed              (GImage *, Layer *, PixelRegion *,
					      PixelRegion *);
static void     project_channel              (GImage *, 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 },
};


/*
 *  Static variables
 */
static int global_gimage_ID = 1;
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GSList *image_list = NULL;
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/* static functions */

static GImage *
gimage_create (void)
{
  GImage *gimage;

  gimage = (GImage *) g_malloc (sizeof (GImage));

  gimage->has_filename = 0;
  gimage->num_cols = 0;
  gimage->cmap = NULL;
  gimage->ID = global_gimage_ID++;
  gimage->ref_count = 0;
  gimage->instance_count = 0;
  gimage->shadow = NULL;
  gimage->dirty = 1;
  gimage->undo_on = TRUE;
  gimage->flat = TRUE;
  gimage->construct_flag = -1;
  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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  image_list = g_slist_append (image_list, (void *) gimage);
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  return gimage;
}

static void
gimage_allocate_projection (GImage *gimage)
{
  if (gimage->projection)
    gimage_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 (gimage_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:
      warning ("gimage type unsupported.\n");
      break;
    }

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

static void
gimage_free_projection (GImage *gimage)
{
  if (gimage->projection)
    tile_manager_destroy (gimage->projection);

  gimage->projection = NULL;
}

static void
gimage_allocate_shadow (GImage *gimage, int width, int height, int bpp)
{
  /*  allocate the new projection  */
  gimage->shadow = tile_manager_new (width, height, bpp);
}


/* function definitions */

GImage *
gimage_new (int width, int height, int base_type)
{
  GImage *gimage;
  int i;

  gimage = gimage_create ();

  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;
      gimage->cmap = (unsigned char *) g_malloc (COLORMAP_SIZE);
      memset (gimage->cmap, 0, COLORMAP_SIZE);
      break;
    default:
      break;
    }

  /*  configure the active pointers  */
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  gimage->active_layer = NULL;
  gimage->active_channel = NULL;  /* no default active channel */
  gimage->floating_sel = NULL;
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  /*  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 */
  gimage->selection_mask = channel_new_mask (gimage->ID, gimage->width, gimage->height);

  lc_dialog_update_image_list ();
  indexed_palette_update_image_list ();

  return gimage;
}


void
gimage_set_filename (GImage *gimage, char *filename)
{
  char *new_filename;

  new_filename = g_strdup (filename);
  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;
    }

  gdisplays_update_title (gimage->ID);
  lc_dialog_update_image_list ();
  indexed_palette_update_image_list ();
}


void
gimage_resize (GImage *gimage, int new_width, int new_height,
	       int offset_x, int offset_y)
{
  Channel *channel;
  Layer *layer;
  Layer *floating_layer;
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  GSList *list;
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  if (new_width <= 0 || new_height <= 0) 
    {
      warning("gimage_resize: width and height must be positive");
      return;
    }

  /*  Get the floating layer if one exists  */
  floating_layer = gimage_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);
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      list = g_slist_next (list);
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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);
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      list = g_slist_next (list);
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    }

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

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

  undo_push_group_end (gimage);

  /*  shrink wrap and update all views  */
  channel_invalidate_previews (gimage->ID);
  layer_invalidate_previews (gimage->ID);
  gimage_invalidate_preview (gimage);
  gdisplays_update_full (gimage->ID);
  gdisplays_shrink_wrap (gimage->ID);
}


void
gimage_scale (GImage *gimage, int new_width, int new_height)
{
  Channel *channel;
  Layer *layer;
  Layer *floating_layer;
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  GSList *list;
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  int old_width, old_height;
  int layer_width, layer_height;

  /*  Get the floating layer if one exists  */
  floating_layer = gimage_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);
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      list = g_slist_next (list);
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    }

  /*  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;

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

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

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

  undo_push_group_end (gimage);

  /*  shrink wrap and update all views  */
  channel_invalidate_previews (gimage->ID);
  layer_invalidate_previews (gimage->ID);
  gimage_invalidate_preview (gimage);
  gdisplays_update_full (gimage->ID);
  gdisplays_shrink_wrap (gimage->ID);
}


GImage *
gimage_get_named (char *name)
{
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  GSList *tmp = image_list;
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  GImage *gimage;
  char *str;

  while (tmp)
    {
      gimage = tmp->data;
      str = prune_filename (gimage_filename (gimage));
      if (strcmp (str, name) == 0)
	return gimage;

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      tmp = g_slist_next (tmp);
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    }

  return NULL;
}


GImage *
gimage_get_ID (int ID)
{
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  GSList *tmp = image_list;
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  GImage *gimage;

  while (tmp)
    {
      gimage = (GImage *) tmp->data;
      if (gimage->ID == ID)
	return gimage;

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      tmp = g_slist_next (tmp);
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    }

  return NULL;
}


TileManager *
gimage_shadow (GImage *gimage, int width, int height, int bpp)
{
  if (gimage->shadow &&
      ((width != gimage->shadow->levels[0].width) ||
       (height != gimage->shadow->levels[0].height) ||
       (bpp != gimage->shadow->levels[0].bpp)))
    gimage_free_shadow (gimage);
  else if (gimage->shadow)
    return gimage->shadow;

  gimage_allocate_shadow (gimage, width, height, bpp);

  return gimage->shadow;
}


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

  gimage->shadow = NULL;
}


void
gimage_delete (GImage *gimage)
{
  gimage->ref_count--;

  if (gimage->ref_count <= 0)
    {
      /*  free the undo list  */
      undo_free (gimage);

      /*  remove this image from the global list  */
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      image_list = g_slist_remove (image_list, (void *) gimage);
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      gimage_free_projection (gimage);
      gimage_free_shadow (gimage);

      if (gimage->cmap)
	g_free (gimage->cmap);

      if (gimage->has_filename)
	g_free (gimage->filename);

      gimage_free_layers (gimage);
      gimage_free_channels (gimage);
      channel_delete (gimage->selection_mask);

      g_free (gimage);

      lc_dialog_update_image_list ();

      indexed_palette_update_image_list ();
    }
}

void
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gimage_apply_image (GImage *gimage, GimpDrawable *drawable, PixelRegion *src2PR,
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		    int undo, int opacity, int mode,
		    /*  alternative to using drawable tiles as src1: */
		    TileManager *src1_tiles,
		    int x, int y)
{
  Channel * mask;
  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 : gimage_get_mask (gimage);

  /*  configure the active channel array  */
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  gimage_get_active_channels (gimage, drawable, active);
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  /*  determine what sort of operation is being attempted and
   *  if it's actually legal...
   */
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  operation = valid_combinations [drawable_type (drawable)][src2PR->bytes];
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  if (operation == -1)
    {
      warning ("gimage_apply_image sent illegal parameters\n");
      return;
    }

  /*  get the layer offsets  */
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  drawable_offsets (drawable, &offset_x, &offset_y);
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  /*  make sure the image application coordinates are within gimage bounds  */
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  x1 = BOUNDS (x, 0, drawable_width (drawable));
  y1 = BOUNDS (y, 0, drawable_height (drawable));
  x2 = BOUNDS (x + src2PR->w, 0, drawable_width (drawable));
  y2 = BOUNDS (y + src2PR->h, 0, drawable_height (drawable));
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  if (mask)
    {
      /*  make sure coordinates are in mask bounds ...
       *  we need to add the layer offset to transform coords
       *  into the mask coordinate system
       */
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      x1 = BOUNDS (x1, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y1 = BOUNDS (y1, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
      x2 = BOUNDS (x2, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y2 = BOUNDS (y2, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
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    }

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

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

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/* Similar to gimage_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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gimage_replace_image (GImage *gimage, GimpDrawable *drawable, PixelRegion *src2PR,
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		      int undo, int opacity,
		      PixelRegion *maskPR,
		      int x, int y)
{
  Channel * mask;
  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 : gimage_get_mask (gimage);

  /*  configure the active channel array  */
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  gimage_get_active_channels (gimage, drawable, active);
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  /*  determine what sort of operation is being attempted and
   *  if it's actually legal...
   */
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  operation = valid_combinations [drawable_type (drawable)][src2PR->bytes];
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  if (operation == -1)
    {
      warning ("gimage_apply_image sent illegal parameters\n");
      return;
    }

  /*  get the layer offsets  */
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  drawable_offsets (drawable, &offset_x, &offset_y);
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  /*  make sure the image application coordinates are within gimage bounds  */
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  x1 = BOUNDS (x, 0, drawable_width (drawable));
  y1 = BOUNDS (y, 0, drawable_height (drawable));
  x2 = BOUNDS (x + src2PR->w, 0, drawable_width (drawable));
  y2 = BOUNDS (y + src2PR->h, 0, drawable_height (drawable));
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  if (mask)
    {
      /*  make sure coordinates are in mask bounds ...
       *  we need to add the layer offset to transform coords
       *  into the mask coordinate system
       */
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      x1 = BOUNDS (x1, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y1 = BOUNDS (y1, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
      x2 = BOUNDS (x2, -offset_x, drawable_width (GIMP_DRAWABLE(mask)) - offset_x);
      y2 = BOUNDS (y2, -offset_y, drawable_height (GIMP_DRAWABLE(mask)) - offset_y);
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    }

  /*  If the calling procedure specified an undo step...  */
  if (undo)
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    drawable_apply_image (drawable, x1, y1, x2, y2, NULL, FALSE);
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  /* configure the pixel regions
   *  If an alternative to using the drawable's data as src1 was provided...
   */
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  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);
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  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;

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

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      apply_mask_to_region (&tempPR, maskPR, OPAQUE_OPACITY);
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      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);
}

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void
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gimage_get_foreground (GImage *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]);

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


void
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gimage_get_background (GImage *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]);

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


void
gimage_get_color (GImage *gimage, int d_type,
		  unsigned char *rgb, unsigned char *src)
{
  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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gimage_transform_color (GImage *gimage, GimpDrawable *drawable,
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			unsigned char *src, unsigned char *dest, int type)
{
#define INTENSITY(r,g,b) (r * 0.30 + g * 0.59 + b * 0.11 + 0.001)
  int d_type;

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  d_type = (drawable != NULL) ? drawable_type (drawable) :
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    gimage_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,
				      gimage->ID,
				      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,
				      gimage->ID,
				      src[GRAY_PIX],
				      src[GRAY_PIX],
				      src[GRAY_PIX]);
	  break;
	}
      break;
    default:
      break;
    }
}

Guide*
gimage_add_hguide (GImage *gimage)
{
  Guide *guide;

  guide = g_new (Guide, 1);
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  guide->ref_count = 0;
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  guide->position = -1;
  guide->orientation = HORIZONTAL_GUIDE;

  gimage->guides = g_list_prepend (gimage->guides, guide);

  return guide;
}

Guide*
gimage_add_vguide (GImage *gimage)
{
  Guide *guide;

  guide = g_new (Guide, 1);
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  guide->ref_count = 0;
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  guide->position = -1;
  guide->orientation = VERTICAL_GUIDE;

  gimage->guides = g_list_prepend (gimage->guides, guide);

  return guide;
}

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

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

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


/************************************************************/
/*  Projection functions                                    */
/************************************************************/

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


static void
project_indexed_alpha (GImage *gimage, Layer *layer,
		       PixelRegion *src, PixelRegion *dest,
		       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
project_channel (GImage *gimage, Channel *channel,
		 PixelRegion *src, PixelRegion *src2)
{
  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,
		      NORMAL, NULL, type);
    }
  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,
		       NORMAL, NULL, type);
    }
}


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


static void
gimage_free_layers (GImage *gimage)
{
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  GSList *list = gimage->layers;
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  Layer * layer;

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


static void
gimage_free_channels (GImage *gimage)
{
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  GSList *list = gimage->channels;
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  Channel * channel;

  while (list)
    {
      channel = (Channel *) list->data;
      channel_delete (channel);
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      list = g_slist_next (list);
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    }
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  g_slist_free (gimage->channels);
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}


static void
gimage_construct_layers (GImage *gimage, int x, int y, int w, int h)
{
  Layer * layer;
  int x1, y1, x2, y2;
  PixelRegion src1PR, src2PR, maskPR;
  PixelRegion * mask;
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  GSList *list = gimage->layers;
  GSList *reverse_list = NULL;
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  int off_x, off_y;
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  /*  composite the floating selection if it exists  */
  if ((layer = gimage_floating_sel (gimage)))
    floating_sel_composite (layer, x, y, w, h, FALSE);

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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
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  /*  If all channels are not visible, simply return  */
  switch (gimage_base_type (gimage))
    {
    case RGB:
      if (! gimage_get_component_visible (gimage, Red) &&
	  ! gimage_get_component_visible (gimage, Green) &&
	  ! gimage_get_component_visible (gimage, Blue))
	return;
      break;
    case GRAY:
      if (! gimage_get_component_visible (gimage, Gray))
	return;
      break;
    case INDEXED:
      if (! gimage_get_component_visible (gimage, Indexed))
	return;
      break;
    }
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#endif
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  while (list)
    {
      layer = (Layer *) list->data;

      /*  only add layers that are visible and not floating selections to the list  */
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      if (!layer_is_floating_sel (layer) && drawable_visible (GIMP_DRAWABLE(layer)))
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	reverse_list = g_slist_prepend (reverse_list, layer);
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      list = g_slist_next (list);
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    }

  while (reverse_list)
    {
      layer = (Layer *) reverse_list->data;
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      drawable_offsets (GIMP_DRAWABLE(layer), &off_x, &off_y);
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      x1 = BOUNDS (off_x, x, x + w);
      y1 = BOUNDS (off_y, y, y + h);
      x2 = BOUNDS (off_x + drawable_width (GIMP_DRAWABLE(layer)), x, x + w);
      y2 = BOUNDS (off_y + drawable_height (GIMP_DRAWABLE(layer)), y, y + h);
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      /* configure the pixel regions  */
      pixel_region_init (&src1PR, gimage_projection (gimage), x1, y1, (x2 - x1), (y2 - y1), TRUE);

      /*  If we're showing the layer mask instead of the layer...  */
      if (layer->mask && layer->show_mask)
	{
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	  pixel_region_init (&src2PR, drawable_data (GIMP_DRAWABLE(layer->mask)),
			     (x1 - off_x), (y1 - off_y),
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			     (x2 - x1), (y2 - y1), FALSE);

	  copy_gray_to_region (&src2PR, &src1PR);
	}
      /*  Otherwise, normal  */
      else
	{
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	  pixel_region_init (&src2PR, drawable_data (GIMP_DRAWABLE(layer)),
			     (x1 - off_x), (y1 - off_y),
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			     (x2 - x1), (y2 - y1), FALSE);

	  if (layer->mask && layer->apply_mask)
	    {
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	      pixel_region_init (&maskPR, drawable_data (GIMP_DRAWABLE(layer->mask)),
				 (x1 - off_x), (y1 - off_y),
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				 (x2 - x1), (y2 - y1), FALSE);
	      mask = &maskPR;
	    }
	  else
	    mask = NULL;

	  /*  Based on the type of the layer, project the layer onto the
	   *  projection image...
	   */
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	  switch (drawable_type (GIMP_DRAWABLE(layer)))
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	    {
	    case RGB_GIMAGE: case GRAY_GIMAGE:
	      /* no mask possible */
	      project_intensity (gimage, layer, &src2PR, &src1PR, mask);
	      break;
	    case RGBA_GIMAGE: case GRAYA_GIMAGE:
	      project_intensity_alpha (gimage, layer, &src2PR, &src1PR, mask);
	      break;
	    case INDEXED_GIMAGE:
	      /* no mask possible */
	      project_indexed (gimage, layer, &src2PR, &src1PR);
	      break;
	    case INDEXEDA_GIMAGE:
	      project_indexed_alpha (gimage, layer, &src2PR, &src1PR, mask);
	      break;
	    default:
	      break;
	    }
	}
      gimage->construct_flag = 1;  /*  something was projected  */

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      reverse_list = g_slist_next (reverse_list);
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    }

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  g_slist_free (reverse_list);
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}


static void
gimage_construct_channels (GImage *gimage, int x, int y, int w, int h)
{
  Channel * channel;
  PixelRegion src1PR, src2PR;
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  GSList *list = gimage->channels;
  GSList *reverse_list = NULL;
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  /*  reverse the channel list  */
  while (list)
    {
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      reverse_list = g_slist_prepend (reverse_list, list->data);
      list = g_slist_next (list);
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    }

  while (reverse_list)
    {
      channel = (Channel *) reverse_list->data;

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      if (drawable_visible (GIMP_DRAWABLE(channel)))
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	{
	  /* configure the pixel regions  */
	  pixel_region_init (&src1PR, gimage_projection (gimage), x, y, w, h, TRUE);
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	  pixel_region_init (&src2PR, drawable_data (GIMP_DRAWABLE(channel)), x, y, w, h, FALSE);
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	  project_channel (gimage, channel, &src1PR, &src2PR);

	  gimage->construct_flag = 1;
	}

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      reverse_list = g_slist_next (reverse_list);
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    }

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  g_slist_free (reverse_list);
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}


static void
gimage_initialize_projection (GImage *gimage, int x, int y, int w, int h)
{
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  GSList *list;
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  Layer *layer;
  int coverage = 0;
  PixelRegion PR;
  unsigned char clear[4] = { 0, 0, 0, 0 };

  /*  this function determines whether a visible layer
   *  provides complete coverage over the image.  If not,
   *  the projection is initialized to transparent
   */
  list = gimage->layers;
  while (list)
    {
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      int off_x, off_y;
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      layer = (Layer *) list->data;
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      drawable_offsets (GIMP_DRAWABLE(layer), &off_x, &off_y);
      if (drawable_visible (GIMP_DRAWABLE(layer)) &&
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	  ! layer_has_alpha (layer) &&
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	  (off_x <= x) &&
	  (off_y <= y) &&
	  (off_x + drawable_width (GIMP_DRAWABLE(layer)) >= x + w) &&
	  (off_y + drawable_height (GIMP_DRAWABLE(layer)) >= y + h))
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	coverage = 1;

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      list = g_slist_next (list);
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    }

  if (!coverage)
    {
      pixel_region_init (&PR, gimage_projection (gimage), x, y, w, h, TRUE);
      color_region (&PR, clear);
    }
}


static void
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gimage_get_active_channels (GImage *gimage, GimpDrawable *drawable, int *active)
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{
  Layer * layer;
  int i;

  /*  first, blindly copy the gimage active channels  */
  for (i = 0; i < MAX_CHANNELS; i++)
    active[i] = gimage->active[i];

  /*  If the drawable is a channel (a saved selection, etc.)
   *  make sure that the alpha channel is not valid
   */
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  if (drawable_channel (drawable) != NULL)
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    active[ALPHA_G_PIX] = 0;  /*  no alpha values in channels  */
  else
    {
      /*  otherwise, check whether preserve transparency is
       *  enabled in the layer and if the layer has alpha
       */
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      if ((layer = drawable_layer (drawable)))
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	if (layer_has_alpha (layer) && layer->preserve_trans)
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	  active[drawable_bytes (GIMP_DRAWABLE(layer)) - 1] = 0;
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    }
}


void
gimage_inflate (GImage *gimage)
{
  /*  Make sure the projection image is allocated  */
  gimage_allocate_projection (gimage);

  gimage->flat = FALSE;

  /*  update the gdisplay titles  */
  gdisplays_update_title (gimage->ID);
}


void
gimage_deflate (GImage *gimage)
{
  /*  Make sure the projection image is deallocated  */
  gimage_free_projection (gimage);

  gimage->flat = TRUE;

  /*  update the gdisplay titles  */
  gdisplays_update_title (gimage->ID);
}


void
gimage_construct (GImage *gimage, int x, int y, int w, int h)
{
  /*  if the gimage is not flat, construction is necessary.  */
  if (! gimage_is_flat (gimage))
    {
      /*  set the construct flag, used to determine if anything
       *  has been written to the gimage raw image yet.
       */
      gimage->construct_flag = 0;

      /*  First, determine if the projection image needs to be
       *  initialized--this is the case when there are no visible
       *  layers that cover the entire canvas--either because layers
       *  are offset or only a floating selection is visible
       */
      gimage_initialize_projection (gimage, x, y, w, h);

      /*  call functions which process the list of layers and
       *  the list of channels
       */
      gimage_construct_layers (gimage, x, y, w, h);
      gimage_construct_channels (gimage, x, y, w, h);
    }
}

void
gimage_invalidate (GImage *gimage, int x, int y, int w, int h, int x1, int y1,
		   int x2, int y2)
{
  Tile *tile;
  TileManager *tm;
  int i, j;
  int startx, starty;
  int endx, endy;
  int tilex, tiley;
  int flat;

  flat = gimage_is_flat (gimage);
  tm = gimage_projection (gimage);

  startx = x;
  starty = y;
  endx = x + w;
  endy = y + h;

  /*  invalidate all tiles which are located outside of the displayed area
   *   all tiles inside the displayed area are constructed.
   */
  for (i = y; i < (y + h); i += (TILE_HEIGHT - (i % TILE_HEIGHT)))
    for (j = x; j < (x + w); j += (TILE_WIDTH - (j % TILE_WIDTH)))
      {
	tile = tile_manager_get_tile (tm, j, i, 0);

	/*  invalidate all lower level tiles  */
	/*tile_manager_invalidate_tiles (gimage_projection (gimage), tile);*/

	if (! flat)
	  {
	    /*  check if the tile is outside the bounds  */
	    if ((MIN ((j + tile->ewidth), x2) - MAX (j, x1)) <= 0)
	      {
		tile->valid = FALSE;
		if (j < x1)
		  startx = MAX (startx, (j + tile->ewidth));
		else
		  endx = MIN (endx, j);
	      }
	    else if (MIN ((i + tile->eheight), y2) - MAX (i, y1) <= 0)
	      {
		tile->valid = FALSE;
		if (i < y1)
		  starty = MAX (starty, (i + tile->eheight));
		else
		  endy = MIN (endy, i);
	      }
	    else
	      {
		/*  If the tile is not valid, make sure we get the entire tile
		 *   in the construction extents
		 */
		if (tile->valid == FALSE)
		  {
		    tilex = j - (j % TILE_WIDTH);
		    tiley = i - (i % TILE_HEIGHT);

		    startx = MIN (startx, tilex);
		    endx = MAX (endx, tilex + tile->ewidth);
		    starty = MIN (starty, tiley);
		    endy = MAX (endy, tiley + tile->eheight);

		    tile->valid = TRUE;
		  }
	      }
	  }
      }

  if (! flat && (endx - startx) > 0 && (endy - starty) > 0)
    gimage_construct (gimage, startx, starty, (endx - startx), (endy - starty));
}

void
gimage_validate (TileManager *tm, Tile *tile, int level)
{
  GImage *gimage;
  int x, y;
  int w, h;

  /*  Get the gimage from the tilemanager  */
  gimage = (GImage *) tm->user_data;

  /*  Find the coordinates of this tile  */
  x = TILE_WIDTH * (tile->tile_num % tm->levels[0].ntile_cols);
  y = TILE_HEIGHT * (tile->tile_num / tm->levels[0].ntile_cols);
  w = tile->ewidth;
  h = tile->eheight;

  gimage_construct (gimage, x, y, w, h);
}

int
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gimage_get_layer_index (GImage *gimage, Layer *layer_arg)
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{
  Layer *layer;
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  GSList *layers = gimage->layers;
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  int index = 0;

  while (layers)
    {
      layer = (Layer *) layers->data;
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      if (layer == layer_arg)
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	return index;

      index++;
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      layers = g_slist_next (layers);
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    }

  return -1;
}

int
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gimage_get_channel_index (GImage *gimage, Channel *channel_ID)
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{
  Channel *channel;
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  GSList *channels = gimage->channels;
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  int index = 0;

  while (channels)
    {
      channel = (Channel *) channels->data;
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      if (channel == channel_ID)
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	return index;

      index++;
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      channels = g_slist_next (channels);
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    }

  return -1;
}


Layer *
gimage_get_active_layer (GImage *gimage)
{
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  return gimage->active_layer;
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}


Channel *
gimage_get_active_channel (GImage *gimage)
{
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  return gimage->active_channel;
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}


int
gimage_get_component_active (GImage *gimage, ChannelType type)
{
  /*  No sanity checking here...  */
  switch (type)
    {
    case Red:     return gimage->active[RED_PIX]; break;
    case Green:   return gimage->active[GREEN_PIX]; break;
    case Blue:    return gimage->active[BLUE_PIX]; break;
    case Gray:    return gimage->active[GRAY_PIX]; break;
    case Indexed: return gimage->active[INDEXED_PIX]; break;
    default:      return 0; break;
    }
}


int
gimage_get_component_visible (GImage *gimage, ChannelType type)
{
  /*  No sanity checking here...  */
  switch (type)
    {
    case Red:     return gimage->visible[RED_PIX]; break;
    case Green:   return gimage->visible[GREEN_PIX]; break;
    case Blue:    return gimage->visible[BLUE_PIX]; break;
    case Gray:    return gimage->visible[GRAY_PIX]; break;
    case Indexed: return gimage->visible[INDEXED_PIX]; break;
    default:      return 0; break;
    }
}


Channel *
gimage_get_mask (GImage *gimage)
{
  return gimage->selection_mask;
}


int
gimage_layer_boundary (GImage *gimage, BoundSeg **segs, int *num_segs)
{
  Layer *layer;

  /*  The second boundary corresponds to the active layer's
   *  perimeter...
   */
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  if ((layer = gimage->active_layer))
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    {
      *segs = layer_boundary (layer, num_segs);
      return 1;
    }
  else
    {
      *segs = NULL;
      *num_segs = 0;
      return 0;
    }
}


Layer *
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gimage_set_active_layer (GImage *gimage, Layer * layer)
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{

  /*  First, find the layer in the gimage
   *  If it isn't valid, find the first layer that is
   */
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  if (gimage_get_layer_index (gimage, layer) == -1)
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    {
      if (! gimage->layers)
	return NULL;
      layer = (Layer *) gimage->layers->data;
    }

  if (! layer)
    return NULL;

  /*  Configure the layer stack to reflect this change  */
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  gimage->layer_stack = g_slist_remove (gimage->layer_stack, (void *) layer);
  gimage->layer_stack = g_slist_prepend (gimage->layer_stack, (void *) layer);
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  /*  invalidate the selection boundary because of a layer modification  */
  layer_invalidate_boundary (layer);

  /*  Set the active layer  */
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  gimage->active_layer = layer;
  gimage->active_channel = NULL;
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  /*  return the layer  */
  return layer;
}


Channel *
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gimage_set_active_channel (GImage *gimage, Channel * channel)
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{

  /*  Not if there is a floating selection  */
  if (gimage_floating_sel (gimage))
    return NULL;

  /*  First, find the channel
   *  If it doesn't exist, find the first channel that does
   */
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  if (! channel) 
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    {
      if (! gimage->channels)
	{
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	  gimage->active_channel = NULL;