psd.c 58.8 KB
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/*
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 * PSD Plugin version 2.0.0
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 * This GIMP plug-in is designed to load Adobe Photoshop(tm) files (.PSD)
 *
 * Adam D. Moss <adam@gimp.org> <adam@foxbox.org>
 *
 *     If this plug-in fails to load a file which you think it should,
 *     please tell me what seemed to go wrong, and anything you know
 *     about the image you tried to load.  Please don't send big PSD
 *     files to me without asking first.
 *
 *          Copyright (C) 1997-98 Adam D. Moss
 *          Copyright (C) 1996    Torsten Martinsen
 *
 * 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
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 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */

/*
 * Adobe and Adobe Photoshop are trademarks of Adobe Systems
 * Incorporated that may be registered in certain jurisdictions.
 */

/*
 * Revision history:
 *
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 *  98.09.04 / v2.0.0 / Adam D. Moss
 *       Now recognises and loads the new Guides extensions written
 *       by Photoshop 4 and 5.
 *
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 *  98.07.31 / v1.9.9.9f / Adam D. Moss
 *       Use OVERLAY_MODE if available.
 *
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 *  98.07.31 / v1.9.9.9e / Adam D. Moss
 *       Worked around some buggy PSD savers (suspect PS4 on Mac) - ugh.
 *       Fixed a bug when loading layer masks of certain dimensions.
 *
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 *  98.05.04 / v1.9.9.9b / Adam D. Moss
 *       Changed the Pascal-style string-reading stuff.  That fixed
 *       some file-padding problems.  Made all debugging output
 *       compile-time optional (please leave it enabled for now).
 *       Reduced memory requirements; still much room for improvement.
 *
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 *  98.04.28 / v1.9.9.9 / Adam D. Moss
 *       Fixed the correct channel interlacing of 'raw' flat images.
 *       Thanks to Christian Kirsch and Jay Cox for spotting this.
 *       Changed some of the I/O routines.
 *
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 *  98.04.26 / v1.9.9.8 / Adam D. Moss
 *       Implemented Aux-channels for layered files.  Got rid
 *       of <endian.h> nonsense.  Improved Layer Mask padding.
 *       Enforced num_layers/num_channels limit checks.
 *
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 *  98.04.23 / v1.9.9.5 / Adam D. Moss
 *       Got Layer Masks working, got Aux-channels working
 *       for unlayered files, fixed 'raw' channel loading, fixed
 *       some other mini-bugs, slightly better progress meters.
 *       Thanks to everyone who is helping with the testing!
 *
 *  98.04.21 / v1.9.9.1 / Adam D. Moss
 *       A little cleanup.  Implemented Layer Masks but disabled
 *       them again - PS masks can be a different size to their
 *       owning layer, unlike those in GIMP.
 *
 *  98.04.19 / v1.9.9.0 / Adam D. Moss
 *       Much happier now.
 *
 *  97.03.13 / v1.9.0 / Adam D. Moss
 *       Layers, channels and masks, oh my.
 *       + Bugfixes & rearchitecturing.
 *
 *  97.01.30 / v1.0.12 / Torsten Martinsen
 *       Flat PSD image loading.
 */

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/*
 * TODO:
 *
 *      Crush 16bpp channels
 *	CMYK -> RGB
 *	Load BITMAP mode
 *
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 *      File saving.  (I am unlikely to be able to do this for
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 *         practical reasons.  Suggest someone works on it as a
 *         separate plugin - please let me know.)
 *
 *      Reduce memory requirements!
 */

/*
 * BUGS:
 *
 *      Sometimes creates a superfluous aux channel?  Harmless.
 */


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/* *** DEFINES *** */
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/* set to TRUE if you want debugging, FALSE otherwise */
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#define PSD_DEBUG TRUE
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/* the max number of layers that this plugin should try to load */
#define MAX_LAYERS 100
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/* the max number of channels that this plugin should let a layer have */
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#define MAX_CHANNELS 30
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/* the max number of guides that this plugin should let an image have */
#define MAX_GUIDES 200

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/* *** END OF DEFINES *** */


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#define IFDBG if (PSD_DEBUG)

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#include <stdio.h>
#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <math.h>
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#include <glib.h>
#include "libgimp/gimp.h"


/* Local types etc
 */
typedef enum
{
  PSD_UNKNOWN_IMAGE,
  PSD_RGB_IMAGE,
  PSD_RGBA_IMAGE,
  PSD_GRAY_IMAGE,
  PSD_GRAYA_IMAGE,
  PSD_INDEXED_IMAGE,
  PSD_INDEXEDA_IMAGE
} psd_imagetype;



/* Declare some local functions.
 */
static void   query      (void);
static void   run        (char    *name,
                          int      nparams,
                          GParam  *param,
                          int     *nreturn_vals,
                          GParam **return_vals);
GDrawableType psd_type_to_gimp_type
                         (psd_imagetype psdtype);
GImageType psd_type_to_gimp_base_type
                         (psd_imagetype psdtype);
GLayerMode psd_lmode_to_gimp_lmode
                         (gchar modekey[4]);
static gint32 load_image (char   *filename);



GPlugInInfo PLUG_IN_INFO =
{
  NULL,    /* init_proc */
  NULL,    /* quit_proc */
  query,   /* query_proc */
  run,     /* run_proc */
};



typedef struct PsdChannel
{
  gchar *name;
  guchar *data;
  gint type;

  guint32 compressedsize;
  
} PSDchannel;



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typedef struct PsdGuide
{
  gboolean horizontal; /* else vertical */
  gint position;
} PSDguide;



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typedef struct PsdLayer
{
  gint num_channels;
  PSDchannel channel[MAX_CHANNELS];
  
  gint32 x;
  gint32 y;
  guint32 width;
  guint32 height;
  
  gchar blendkey[4];
  guchar opacity;
  gchar clipping;

  gboolean protecttrans;
  gboolean visible;

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  gchar* name;
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  gint32 lm_x;
  gint32 lm_y;
  gint32 lm_width;
  gint32 lm_height;

} PSDlayer;



typedef struct PsdImage
{
  gint num_layers;
  PSDlayer layer[MAX_LAYERS];

  gboolean absolute_alpha;

  gint type;
  
  gulong colmaplen;
  guchar *colmapdata;

  guint num_aux_channels;
  PSDchannel aux_channel[MAX_CHANNELS];

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  guint num_guides;
  PSDguide guides[MAX_GUIDES];

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  gchar *caption;

  guint active_layer_num;

} PSDimage;



static PSDimage psd_image;



static struct {
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    gchar signature[4];
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    gushort version;
    guchar reserved[6];
    gushort channels;
    gulong rows;
    gulong columns;
    gushort bpp;
    gushort mode;
    gulong imgreslen;
    gulong miscsizelen;
    gushort compression;
    gushort * rowlength;
    long  imgdatalen;
} PSDheader;


static gchar * modename[] = {
    "Bitmap", 
    "Grayscale", 
    "Indexed Colour", 
    "RGB Colour", 
    "CMYK Colour", 
    "<invalid>", 
    "<invalid>", 
    "Multichannel", 
    "Duotone", 
    "Lab Colour", 
    "<invalid>"
};


static const gchar *prog_name = "PSD";


static void unpack_pb_channel(FILE *fd, guchar *dst, gint32 unpackedlen,
				  guint32 *offset);
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static void decode(long clen, long uclen, gchar *src, gchar *dst, int step);
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static void packbitsdecode(long *clenp, long uclen,
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			   gchar *src, gchar *dst, int step);
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static void cmyk2rgb(guchar *src, guchar *destp,
		     long width, long height, int alpha);
static void cmykp2rgb(guchar *src, guchar *destp,
		      long width, long height, int alpha);
static void cmyk_to_rgb(int *c, int *m, int *y, int *k);
static guchar getguchar(FILE *fd, gchar *why);
static gshort getgshort(FILE *fd, gchar *why);
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static glong getglong(FILE *fd, gchar *why);
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static void xfread(FILE *fd, void *buf, long len, gchar *why);
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static void xfread_interlaced(FILE *fd, guchar *buf, long len, gchar *why,
			      gint step);
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static void* xmalloc(size_t n);
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static void read_whole_file(FILE *fd);
static void reshuffle_cmap(guchar *map256);
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static guchar* getpascalstring(FILE *fd, gchar *why);
static gchar* getstring(size_t n, FILE * fd, gchar *why);
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void throwchunk(size_t n, FILE * fd, gchar *why);
void dumpchunk(size_t n, FILE * fd, gchar *why);
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MAIN()

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static void
query ()
{
  static GParamDef load_args[] =
  {
    { PARAM_INT32, "run_mode", "Interactive, non-interactive" },
    { PARAM_STRING, "filename", "The name of the file to load" },
    { PARAM_STRING, "raw_filename", "The name of the file to load" },
  };
  static GParamDef load_return_vals[] =
  {
    { PARAM_IMAGE, "image", "Output image" },
  };
  static int nload_args = sizeof (load_args) / sizeof (load_args[0]);
  static int nload_return_vals = sizeof (load_return_vals) / sizeof (load_return_vals[0]);

  gimp_install_procedure ("file_psd_load",
                          "loads files of the Photoshop(tm) PSD file format",
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                          "This filter loads files of Adobe Photoshop(tm) native PSD format.  These files may be of any image type supported by GIMP, with or without layers, layer masks, aux channels and guides.",
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                          "Adam D. Moss & Torsten Martinsen",
                          "Adam D. Moss & Torsten Martinsen",
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                          "1996-1998",
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                          "<Load>/PSD",
			  NULL,
                          PROC_PLUG_IN,
                          nload_args, nload_return_vals,
                          load_args, load_return_vals);

  gimp_register_load_handler ("file_psd_load", "psd", "");
}



static void
run (char    *name,
     int      nparams,
     GParam  *param,
     int     *nreturn_vals,
     GParam **return_vals)
{
  static GParam values[2];
  GRunModeType run_mode;
  /*  GStatusType status = STATUS_SUCCESS;*/
  gint32 image_ID;

  run_mode = param[0].data.d_int32;

  *nreturn_vals = 1;
  *return_vals = values;
  values[0].type = PARAM_STATUS;
  values[0].data.d_status = STATUS_CALLING_ERROR;

  if (strcmp (name, "file_psd_load") == 0)
    {
      image_ID = load_image (param[1].data.d_string);

      if (image_ID != -1)
	{
	  *nreturn_vals = 2;
	  values[0].data.d_status = STATUS_SUCCESS;
	  values[1].type = PARAM_IMAGE;
	  values[1].data.d_image = image_ID;
	}
      else
	{
	  values[0].data.d_status = STATUS_EXECUTION_ERROR;
	}
    }
}


GDrawableType
psd_type_to_gimp_type (psd_imagetype psdtype)
{
  switch(psdtype)
    {
    case PSD_RGBA_IMAGE: return(RGBA_IMAGE);
    case PSD_RGB_IMAGE: return(RGB_IMAGE);
    case PSD_GRAYA_IMAGE: return(GRAYA_IMAGE);
    case PSD_GRAY_IMAGE: return(GRAY_IMAGE);
    case PSD_INDEXEDA_IMAGE: return(INDEXEDA_IMAGE);
    case PSD_INDEXED_IMAGE: return(INDEXED_IMAGE);
    default: return(RGB_IMAGE);
    }
}



GLayerMode
psd_lmode_to_gimp_lmode (gchar modekey[4])
{
  if (strncmp(modekey, "norm", 4)==0) return(NORMAL_MODE);
  if (strncmp(modekey, "dark", 4)==0) return(DARKEN_ONLY_MODE);
  if (strncmp(modekey, "lite", 4)==0) return(LIGHTEN_ONLY_MODE);
  if (strncmp(modekey, "hue ", 4)==0) return(HUE_MODE);
  if (strncmp(modekey, "sat ", 4)==0) return(SATURATION_MODE);
  if (strncmp(modekey, "colr", 4)==0) return(COLOR_MODE);
  if (strncmp(modekey, "mul ", 4)==0) return(MULTIPLY_MODE);
  if (strncmp(modekey, "scrn", 4)==0) return(SCREEN_MODE);
  if (strncmp(modekey, "diss", 4)==0) return(DISSOLVE_MODE);
  if (strncmp(modekey, "diff", 4)==0) return(DIFFERENCE_MODE);
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  if (strncmp(modekey, "lum ", 4)==0) return(VALUE_MODE);

#if (GIMP_MAJOR_VERSION > 0) && (GIMP_MINOR_VERSION > 0)
  if (strncmp(modekey, "over", 4)==0) return(OVERLAY_MODE);

  printf("PSD: Warning - unsupported layer-blend mode '%c%c%c%c', using "
	 "'overlay' mode\n", modekey[0], modekey[1], modekey[2], modekey[3]);
  if (strncmp(modekey, "hLit", 4)==0) return(/**/OVERLAY_MODE);
  if (strncmp(modekey, "sLit", 4)==0) return(/**/OVERLAY_MODE);
#else
  printf("PSD: Warning - unsupported layer-blend mode '%c%c%c%c', using "
	 "'addition' mode\n", modekey[0], modekey[1], modekey[2], modekey[3]);
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  if (strncmp(modekey, "over", 4)==0) return(ADDITION_MODE); /* ? */
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  if (strncmp(modekey, "hLit", 4)==0) return(/**/ADDITION_MODE);
  if (strncmp(modekey, "sLit", 4)==0) return(/**/ADDITION_MODE);
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#endif
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  printf("PSD: Warning - UNKNOWN layer-blend mode, reverting to 'normal'\n");

  return(NORMAL_MODE);
}



GImageType
psd_type_to_gimp_base_type (psd_imagetype psdtype)
{
  switch(psdtype)
    {
    case PSD_RGBA_IMAGE:
    case PSD_RGB_IMAGE: return(RGB);
    case PSD_GRAYA_IMAGE:
    case PSD_GRAY_IMAGE: return(GRAY);
    case PSD_INDEXEDA_IMAGE:
    case PSD_INDEXED_IMAGE: return(INDEXED);
    default:
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      g_message ("PSD: Error: Can't convert PSD imagetype to GIMP imagetype\n");
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      gimp_quit();
      return(RGB);
    }
}



GImageType
psd_mode_to_gimp_base_type (gushort psdtype)
{
  switch(psdtype)
    {
    case 1: return(GRAY);
    case 2: return(INDEXED);
    case 3: return(RGB);
    default:
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      g_message ("PSD: Error: Can't convert PSD mode to GIMP base imagetype\n");
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      gimp_quit();
      return(RGB);
    }
}



static void
reshuffle_cmap(guchar *map256)
{
  guchar *tmpmap;
  int i;

  tmpmap = xmalloc(768);

  for (i=0;i<256;i++)
    {
      tmpmap[i*3  ] = map256[i];
      tmpmap[i*3+1] = map256[i+256];
      tmpmap[i*3+2] = map256[i+512];
    }

  for (i=0;i<768;i++)
    {
      map256[i] = tmpmap[i];
    }

  g_free(tmpmap);
}



static void
dispatch_resID(guint ID, FILE *fd, guint32 *offset, guint32 Size)
{
  if ( (ID < 0x0bb6) && (ID >0x07d0) )
    {
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      IFDBG printf ("\t\tPath data is irrelevant to GIMP at this time.\n");
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      throwchunk(Size, fd, "dispatch_res path throw");
      (*offset) += Size;
    }
  else
    switch (ID)
      {
      case 0x03ee:
	{
	  gint32 remaining = Size;
	  
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	  IFDBG printf ("\t\tALPHA CHANNEL NAMES:\n");
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	  if (Size > 0)
	    {
	      do
		{
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		  guchar slen;
		  gchar* sname;

		  slen = getguchar (fd, "alpha channel name length");
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		  (*offset)++;
		  remaining--;

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		  /* Check for (Mac?) Photoshop (4?) file-writing bug */
		  if (slen > remaining)
		    {
		      IFDBG {printf("\nYay, a file bug.  "
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				    "Yuck.  Photoshop 4/Mac?  "
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				    "I'll work around you.\n");fflush(stdout);}
		      break;
		    }

		  if (slen)
		    {
		      sname = getstring(slen, fd, "alpha channel name");

		      psd_image.aux_channel[psd_image.num_aux_channels].name =
			sname;
		    }
		  else
		    {
		      psd_image.aux_channel[psd_image.num_aux_channels].name =
			NULL;
		    }

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		  if (psd_image.aux_channel[psd_image.num_aux_channels].name
		      == NULL)
		    {
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		      IFDBG
			{printf("\t\t\tNull channel name %d.\n",
				psd_image.num_aux_channels);fflush(stdout);}
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		    }

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		  if (psd_image.aux_channel[psd_image.num_aux_channels].name)
		    {
		      guint32 alpha_name_len;
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		      alpha_name_len =
			strlen(psd_image.aux_channel[psd_image.num_aux_channels].name);
		      
		      IFDBG printf("\t\t\tname: \"%s\"\n",
				   psd_image.aux_channel[psd_image.num_aux_channels].name);
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		      (*offset) += alpha_name_len;
		      remaining -= alpha_name_len;
		    }

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		  psd_image.num_aux_channels++;
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		  if (psd_image.num_aux_channels > MAX_CHANNELS)
		    {
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		      printf("\nPSD: Sorry - this image has too many "
			     "aux channels.  Tell Adam!\n");
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		      gimp_quit();
		    }
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		}
	      while (remaining > 0);
	    }

	  if (remaining)
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	    {
	      dumpchunk(remaining, fd, "alphaname padding 0 throw");
	      (*offset) += remaining;
	      remaining = 0;
	    }
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	}
	break;
      case 0x03ef:
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	IFDBG printf("\t\tDISPLAYINFO STRUCTURE: unhandled\n");
	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
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	break;
      case 0x03f0: /* FIXME: untested */
	{
	  psd_image.caption = getpascalstring(fd, "caption string");
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	  (*offset)++;

	  if (psd_image.caption)
	    {
	      IFDBG printf("\t\t\tcontent: \"%s\"\n",psd_image.caption);
	      (*offset) += strlen(psd_image.caption);
	    }
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	}
	break;
      case 0x03f2:
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	IFDBG printf("\t\tBACKGROUND COLOR: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;	
      case 0x03f4:
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	IFDBG printf("\t\tGREY/MULTICHANNEL HALFTONING INFO: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03f5:
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	IFDBG printf("\t\tCOLOUR HALFTONING INFO: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03f6:
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	IFDBG printf("\t\tDUOTONE HALFTONING INFO: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03f7:
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	IFDBG printf("\t\tGREYSCALE/MULTICHANNEL TRANSFER FUNCTION: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03f8:
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	IFDBG printf("\t\tCOLOUR TRANSFER FUNCTION: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03f9:
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	IFDBG printf("\t\tDUOTONE TRANSFER FUNCTION: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03fa:
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	IFDBG printf("\t\tDUOTONE IMAGE INFO: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03fb:
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	IFDBG printf("\t\tEFFECTIVE BLACK/WHITE VALUES: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x03fe:
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	IFDBG printf("\t\tQUICK MASK INFO: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x0400:
	{
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	  IFDBG printf("\t\tLAYER STATE INFO:\n");
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	  psd_image.active_layer_num = getgshort(fd, "ID target_layer_num");

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	  IFDBG printf("\t\t\ttarget: %d\n",(gint)psd_image.active_layer_num);
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	  (*offset) += 2;
	}
	break;
      case 0x0402:
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	IFDBG printf("\t\tLAYER GROUP INFO: unhandled\n");
	IFDBG printf("\t\t\t(Inferred number of layers: %d)\n",(gint)(Size/2));
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
      case 0x0405:
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	IFDBG printf ("\t\tIMAGE MODE FOR RAW FORMAT: unhandled\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
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      case 0x0408:
	{
	  gint32 remaining = Size;
	  int i;
	  IFDBG printf ("\t\tGUIDE INFORMATION:\n");
	  
	  if (Size > 0)
	    {
	      glong magic1, magic2, magic3;
	      glong num_guides;

	      magic1 = getglong(fd, "guide");
	      (*offset) += 4;
	      magic2 = getglong(fd, "guide");
	      (*offset) += 4;
	      magic3 = getglong(fd, "guide");
	      (*offset) += 4;
	      remaining -= 12;

	      IFDBG printf("\t\t\tMagic: %ld %ld %ld\n",
			   magic1, magic2, magic3);
	      IFDBG printf("\t\t\tMagic: %lx %lx %lx\n",
			   magic1, magic2, magic3);

	      num_guides = getglong(fd, "guide");
	      (*offset) += 4; remaining -= 4;

	      if (remaining != num_guides*5)
		{
		  IFDBG printf ("** FUNNY AMOUNT OF GUIDE DATA (%d)\n",
				remaining);
		  goto funny_amount_of_guide_data;
		}
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	      IFDBG printf("\t\t\tNumber of guides is %ld\n", num_guides);
	      if (num_guides > MAX_GUIDES)
		{
		  g_message ("Sorry, this image has too many Guides.  "
			     "Tell Adam!\n");
		  gimp_quit();
		}
	      psd_image.num_guides = num_guides;

	      for (i=0; i<num_guides; i++)
		{
		  psd_image.guides[i].position = getglong(fd, "guide");
		  /* FIXME: not 32 -- magic enum/denom!? */
		  psd_image.guides[i].position =
		    rint((double)psd_image.guides[i].position/(double)32.0);

		  psd_image.guides[i].horizontal = (1==getguchar(fd, "guide"));
		  (*offset) += 5; remaining -= 5;

		  IFDBG printf("\t\t\tGuide %d at %d, %s\n", i+1,
			       psd_image.guides[i].position,
			       psd_image.guides[i].horizontal ? "horizontal" :
			       "vertical");
		}
	    }

	funny_amount_of_guide_data:
	  
	  if (remaining)
	    {
	      IFDBG printf ("** GUIDE INFORMATION DROSS: ");
	      dumpchunk(remaining, fd, "dispatch_res");
	      (*offset) += remaining;
	    }
	}
	break;
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      case 0x03e9:
      case 0x03ed:
      case 0x03f1:
      case 0x03f3:
      case 0x03fd:
      case 0x0401:
      case 0x0404:
      case 0x0406:
      case 0x0bb7:
      case 0x2710:
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	IFDBG printf ("\t\t<Field is irrelevant to GIMP at this time.>\n");
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	throwchunk(Size, fd, "dispatch_res");	
	(*offset) += Size;
	break;
	
      case 0x03e8:
      case 0x03eb:
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	IFDBG printf ("\t\t<Obsolete Photoshop 2.0 field.>\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
	
      case 0x03fc:
      case 0x03ff:
      case 0x0403:
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	IFDBG printf ("\t\t<Obsolete field.>\n");
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	throwchunk(Size, fd, "dispatch_res");
	(*offset) += Size;
	break;
	
      default:
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	IFDBG printf ("\t\t<Undocumented field.>\n");
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	dumpchunk(Size, fd, "dispatch_res");
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	(*offset) += Size;
	break;
      }
}


static void
do_layer_record(FILE *fd, guint32 *offset, gint layernum)
{
  gint32 top, left, bottom, right;
  guint32 extradatasize, layermaskdatasize, layerrangesdatasize;
  guint32 totaloff;
  gchar sig[4];
  guchar flags;
  gint i;

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  IFDBG printf("\t\t\tLAYER RECORD (layer %d)\n", (int)layernum);
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  /* table 11-12 */
  top = getglong (fd, "layer top");
  (*offset)+=4;
  left = getglong (fd, "layer left");
  (*offset)+=4;
  bottom = getglong (fd, "layer bottom");
  (*offset)+=4;
  right = getglong (fd, "layer right");
  (*offset)+=4;
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  psd_image.layer[layernum].x = left;
  psd_image.layer[layernum].y = top;
  psd_image.layer[layernum].width = right-left;
  psd_image.layer[layernum].height = bottom-top;
  
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  IFDBG printf("\t\t\t\tLayer extents: (%d,%d) -> (%d,%d)\n",left,top,right,bottom);
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  psd_image.layer[layernum].num_channels =
    getgshort (fd, "layer num_channels");
  (*offset)+=2;
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  if (psd_image.layer[layernum].num_channels > MAX_CHANNELS)
    {
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      g_message ("\nPSD: Sorry - this image has too many channels.  Tell Adam!\n");
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      gimp_quit();
    }
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  IFDBG printf("\t\t\t\tNumber of channels: %d\n",
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	 (int)psd_image.layer[layernum].num_channels);

  for (i=0;i<psd_image.layer[layernum].num_channels;i++)
    {
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      /* table 11-13 */
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      IFDBG printf("\t\t\t\tCHANNEL LENGTH INFO (%d)\n", i);
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      psd_image.layer[layernum].channel[i].type	= getgshort(fd, "channel id");
      (*offset)+=2;
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      IFDBG printf("\t\t\t\t\tChannel TYPE: %d\n",
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	     psd_image.layer[layernum].channel[i].type);

      psd_image.layer[layernum].channel[i].compressedsize =
	getglong(fd, "channeldatalength");
      (*offset)+=4;
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      IFDBG printf("\t\t\t\t\tChannel Data Length: %d\n",
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	     psd_image.layer[layernum].channel[i].compressedsize);
    }

  xfread(fd, sig, 4, "layer blend sig");
  (*offset)+=4;
  
  if (strncmp(sig, "8BIM", 4)!=0)
    {
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      g_message ("PSD: Error - layer blend signature is incorrect. :-(\n");
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      gimp_quit();
    }

  xfread(fd, psd_image.layer[layernum].blendkey, 4, "layer blend key");
  (*offset)+=4;

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  IFDBG printf("\t\t\t\tBlend type: PSD(\"%c%c%c%c\") = GIMP(%d)\n",
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	 psd_image.layer[layernum].blendkey[0],
	 psd_image.layer[layernum].blendkey[1],
	 psd_image.layer[layernum].blendkey[2],
	 psd_image.layer[layernum].blendkey[3],
	 psd_lmode_to_gimp_lmode(psd_image.layer[layernum].blendkey));

  psd_image.layer[layernum].opacity = getguchar(fd, "layer opacity");
  (*offset)++;

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  IFDBG printf("\t\t\t\tLayer Opacity: %d\n", psd_image.layer[layernum].opacity);
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  psd_image.layer[layernum].clipping = getguchar(fd, "layer clipping");
  (*offset)++;

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  IFDBG printf("\t\t\t\tLayer Clipping: %d (%s)\n",
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	 psd_image.layer[layernum].clipping,
	 psd_image.layer[layernum].clipping==0?"base":"non-base");

  flags = getguchar(fd, "layer flags");
  (*offset)++;

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  IFDBG printf("\t\t\t\tLayer Flags: %d (%s, %s)\n", flags,
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	 flags&1?"preserve transparency":"don't preserve transparency",
	 flags&2?"visible":"not visible");

  psd_image.layer[layernum].protecttrans = (flags&1) ? TRUE : FALSE;
  psd_image.layer[layernum].visible = (flags&2) ? FALSE : TRUE;

  getguchar(fd, "layer record filler");
  (*offset)++;

  extradatasize = getglong(fd, "layer extra data size");
  (*offset)+=4;
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  IFDBG printf("\t\t\t\tEXTRA DATA SIZE: %d\n",extradatasize);
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  /* FIXME: should do something with this data */
  /*throwchunk(extradatasize, fd, "layer extradata throw");
  (*offset) += extradatasize;*/

  totaloff = (*offset) + extradatasize;

  /* table 11-14 */
  layermaskdatasize = getglong(fd, "layer mask data size");
  (*offset)+=4;
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  IFDBG printf("\t\t\t\t\tLAYER MASK DATA SIZE: %d\n",layermaskdatasize);
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  if (layermaskdatasize)
    {
      top    = getglong(fd, "lmask top");
      (*offset) += 4;
      left   = getglong(fd, "lmask left");
      (*offset) += 4;
      bottom = getglong(fd, "lmask bottom");
      (*offset) += 4;
      right  = getglong(fd, "lmask right");
      (*offset) += 4;

      psd_image.layer[layernum].lm_x = left;
      psd_image.layer[layernum].lm_y = top;
      psd_image.layer[layernum].lm_width = right-left;
      psd_image.layer[layernum].lm_height = bottom-top;

      getglong(fd, "lmask data throw");
      (*offset) += 4;

      /*      throwchunk(layermaskdatasize, fd, "layer mask data throw");
      (*offset) += layermaskdatasize;*/
    }


  layerrangesdatasize = getglong(fd, "layer ranges data size");
  (*offset)+=4;
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  IFDBG printf("\t\t\t\t\t\tLAYER RANGES DATA SIZE: %d\n",layermaskdatasize);
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  if (layerrangesdatasize)
    {
      throwchunk(layerrangesdatasize, fd, "layer ranges data throw");
      (*offset) += layerrangesdatasize;
    }

  psd_image.layer[layernum].name = getpascalstring(fd, "layer name");
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  (*offset)++;
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  if (psd_image.layer[layernum].name)
    {
      (*offset) += strlen(psd_image.layer[layernum].name);
      IFDBG printf("\t\t\t\t\t\tLAYER NAME: '%s'\n",psd_image.layer[layernum].name);
    }
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  if (totaloff-(*offset) > 0)
    {
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      IFDBG 
	{
	  printf("Warning: layer record dross: ");
	  dumpchunk(totaloff-(*offset), fd, "layer record dross throw");
	}
	else
	{
	  throwchunk(totaloff-(*offset), fd, "layer record dross throw");
	}
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      (*offset) = totaloff;
    }
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}


static void
do_layer_struct(FILE *fd, guint32 *offset)
{
  gint i;

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  IFDBG printf("\t\tLAYER STRUCTURE SECTION\n");
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  psd_image.num_layers = getgshort(fd, "layer struct numlayers");
  (*offset)+=2;

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  IFDBG printf("\t\t\tCanonical number of layers: %d%s\n",
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	 psd_image.num_layers>0?
	 (int)psd_image.num_layers:abs(psd_image.num_layers),
	 psd_image.num_layers>0?"":" (absolute/alpha)");

  if (psd_image.num_layers<0)
    {
      psd_image.num_layers = -psd_image.num_layers;
      psd_image.absolute_alpha = TRUE;
    }
  else
    {
      psd_image.absolute_alpha = FALSE;
    }

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  if (psd_image.num_layers > MAX_LAYERS)
    {
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      g_message ("\nPSD: Sorry - this image has too many layers.  Tell Adam!\n");
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      gimp_quit();
    }

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  for (i=0; i<psd_image.num_layers; i++)
    {
      do_layer_record(fd, offset, i);
    }
}


static void
do_layer_pixeldata(FILE *fd, guint32 *offset)
{
  guint16 compression;
  gint layeri, channeli;
  guchar *tmpline;

  for (layeri=0; layeri<psd_image.num_layers; layeri++)
    {
      for (channeli=0;
	   channeli<psd_image.layer[layeri].num_channels;
	   channeli++)
	{
	  int width, height;

	  if (psd_image.layer[layeri].channel[channeli].type == -2)
	    {
	      width = psd_image.layer[layeri].lm_width;
	      height = psd_image.layer[layeri].lm_height;
	    }
	  else
	    {
	      width = psd_image.layer[layeri].width;
	      height = psd_image.layer[layeri].height;
	    }

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	  tmpline = xmalloc(width + 1);

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	  compression = getgshort(fd, "layer channel compression type");
	  (*offset)+=2;
	      
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	  IFDBG
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	    {
	      printf("\t\t\tLayer (%d) Channel (%d:%d) Compression: %d (%s)\n",
		     layeri,
		     channeli,
		     psd_image.layer[layeri].channel[channeli].type,
		     compression,
		     compression==0?"raw":(compression==1?"RLE":"UNKNOWN!"));
	      fflush(stdout);
	    }
	    
	  IFDBG {printf("\t\t\t\tLoading channel data (%d bytes)...\n",
			width*height);fflush(stdout);}
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	  psd_image.layer[layeri].channel[channeli].data =
	    xmalloc (width * height);
	      
	  switch (compression)
	    {
	    case 0: /* raw data */
	      {
		gint linei;
		    
		for (linei=0;
		     linei<height;
		     linei++)
		  {
		    xfread(fd,
			   (psd_image.layer[layeri].channel[channeli].data+
			    linei * width),
			   width,
			   "raw channel line");
		    (*offset) += width;
		  }

		/* Pad raw data to multiple of 2? */
#if 0
		if ((height *
		     width) & 1)
		  {
		    getguchar(fd, "raw channel padding");
		    (*offset)++;
		  }
#endif
	      }
	      break;
	    case 1: /* RLE, one row at a time, padded to an even width */
	      {
		gint linei;
		gint blockread;
		    
		/* we throw this away because in theory we can trust the
		   data to unpack to the right length... hmm... */
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		throwchunk(height * 2,
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			   fd, "widthlist");
		(*offset) += height * 2;
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		blockread = (*offset);
		    
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		/*IFDBG {printf("\nHere comes the guitar solo...\n");
		fflush(stdout);}*/
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		for (linei=0;
		     linei<height;
		     linei++)
		  {
		    /*printf(" %d ", *offset);*/
		    unpack_pb_channel(fd, tmpline,
				      width 
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				      /*+ (width&1)*/,
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				      offset);
		    memcpy((psd_image.layer[layeri].channel[channeli].data+
			    linei * width),
			   tmpline,
			   width);
		  }
		    
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		IFDBG {printf("\t\t\t\t\tActual compressed size was %d bytes\n"
			      , (*offset)-blockread);fflush(stdout);}
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	      }
	      break;
	    default: /* *unknown* */
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	      IFDBG {printf("\nEEP!\n");fflush(stdout);}
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	      g_message ("*** Unknown compression type in channel.\n");
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	      gimp_quit();
	      break;
	    }
	  
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	  if (tmpline)
	    g_free(tmpline);
	  else
	    IFDBG {printf("\nTRIED TO FREE NULL!");fflush(stdout);}
	}
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    }
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  /*  printf("\n[[%ld]]\n", getglong(fd, "uhhhh"));
  (*offset)+=4;*/
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}


static void
do_layers(FILE *fd, guint32 *offset)
{
  guint32 section_length;

  section_length = getglong(fd, "layerinfo sectionlength");
  (*offset)+=4;

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  IFDBG printf("\tLAYER INFO SECTION\n");
  IFDBG printf("\t\tSECTION LENGTH: %u\n",section_length);
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  do_layer_struct(fd, offset);

  do_layer_pixeldata(fd, offset);
}



static void
do_layer_and_mask(FILE *fd)
{
  guint32 offset = 0;
  guint32 Size = PSDheader.miscsizelen;


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  guint32 offset_now = ftell(fd);


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  IFDBG printf("LAYER AND MASK INFO\n");
  IFDBG printf("\tSECTION LENGTH: %u\n",Size);
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  if (Size == 0) return;

  do_layers(fd, &offset);

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  IFDBG {printf("And...?\n");fflush(stdout);}
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  if (offset < Size)
    {
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      IFDBG
	{
	  printf("PSD: Supposedly there are %d bytes of mask info left.\n",
		 Size-offset);
	  if ((Size-offset == 4) || (Size-offset == 24))
	    printf("     That sounds good to me.\n");
	  else
	    printf("     That sounds strange to me.\n");
	}
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      /*      if ((getguchar(fd, "mask info throw")!=0) ||
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	  (getguchar(fd, "mask info throw")!=0) ||
	  (getguchar(fd, "mask info throw")!=0) ||
	  (getguchar(fd, "mask info throw")!=0))
	{
	  printf("*** This mask info block looks pretty bogus.\n");
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	}*/
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    }
  else
    printf("PSD: Stern warning - no mask info.\n");
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  /* If 'offset' wasn't being buggily updated, we wouldn't need this. */
  fseek(fd, Size+offset_now, SEEK_SET);
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}



static void
do_image_resources(FILE *fd)
{
  guint16 ID;
  gchar *Name;
  guint32 Size;

  guint32 offset = 0;

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  IFDBG printf("IMAGE RESOURCE BLOCK:\n");
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  /* FIXME: too trusting that the file isn't corrupt */
  while (offset < PSDheader.imgreslen-1)
    {
      gchar sig[4];
      
      xfread(fd, sig, 4, "imageresources signature");

      if (strncmp(sig, "8BIM", 4) != 0)
	{
	  printf("PSD: Error - imageresources block has invalid signature.\n");
	  gimp_quit();
	}
      offset += 4;

      /* generic information about a block ID */


      ID = getgshort(fd, "ID num");
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      offset += 2;
      IFDBG printf("\tID: 0x%04x / ",ID);
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      Name = getpascalstring(fd, "ID name");
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      offset++;
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      if (Name)
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	{
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	  IFDBG printf("\"%s\" ", Name);
	  offset += strlen(Name);

	  if (!(strlen(Name)&1))
	    {
	      throwchunk(1, fd, "ID name throw");
	      offset ++;
	    }
	  g_free(Name);
	}
      else
	{
	  throwchunk(1, fd, "ID name throw2");
	  offset++;
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	}

      Size = getglong(fd, "ID Size");
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      offset += 4;
      IFDBG printf("Size: %d\n", Size);
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      dispatch_resID(ID, fd, &offset, Size);

      if (Size&1)
	{
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	  IFDBG printf("+1");
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	  throwchunk(1, fd, "ID content throw");
	  offset ++;
	}
    }

  /*  if (offset != PSDheader.imgreslen)
    {
      printf("\tSucking imageres byte...\n");
      throwchunk(1, fd, "imageres suck");
      offset ++;
    }*/

}


static
guchar* chans_to_GRAYA (guchar* grey, guchar* alpha, gint numpix)
{
  guchar* rtn;
  int i; /* clearly, 'i' stands for 'Imaginative loop variable' */

  if ((grey==NULL)||(alpha==NULL))
    {
      printf("NULL channel - eep!");
      return NULL;
    }

  rtn = xmalloc(numpix * 2);

  for (i=0; i<numpix; i++)
    {
      rtn[i*2  ] = grey[i];
      rtn[i*2+1] = alpha[i];
    }

  return (rtn);
}


static
guchar* chans_to_RGB (guchar* red, guchar* green, guchar* blue, gint numpix)
{
  guchar* rtn;
  int i;

  if ((red==NULL)||(green==NULL)||(blue==NULL))
    {
      printf("NULL channel - eep!");
      return NULL;
    }

  rtn = xmalloc(numpix * 3);

  for (i=0; i<numpix; i++)
    {
      rtn[i*3  ] = red[i];
      rtn[i*3+1] = green[i];
      rtn[i*3+2] = blue[i];
    }

  return (rtn);
}



static
guchar* chans_to_RGBA (guchar* red, guchar* green, guchar* blue,
		       guchar* alpha,
		       gint numpix)
{
  guchar* rtn;
  int i;
  gboolean careful = FALSE;

  if ((red==NULL)||(green==NULL)||(blue==NULL)||(alpha==NULL))
    {
      printf("chans_to_RGBA : NULL channel - eep!");
      careful = TRUE;
    }

  rtn = xmalloc(numpix * 4);

  if (!careful)
    {
      for (i=0; i<numpix; i++)
	{
	  rtn[i*4  ] = red[i];
	  rtn[i*4+1] = green[i];
	  rtn[i*4+2] = blue[i];
	  rtn[i*4+3] = alpha[i];
	}
    }
  else
    {
      for (i=0; i<numpix; i++)
	{
	  rtn[i*4  ] = (red==NULL) ? 0 : red[i];
	  rtn[i*4+1] = (green==NULL) ? 0 : green[i];
	  rtn[i*4+2] = (blue==NULL) ? 0 : blue[i];
	  rtn[i*4+3] = (alpha==NULL) ? 0 : alpha[i];
	}
    }

  return (rtn);
}


static
gboolean psd_layer_has_alpha(PSDlayer* layer)
{
  int i;

  for (i=0; i<layer->num_channels; i++)
    {
      if (layer->channel[i].type == -1)
	{
	  return TRUE;
	}
    }

  return FALSE;
}


static
void extract_data_and_channels(guchar* src, gint gimpstep, gint psstep,
			       gint32 image_ID, GDrawable* drawable,
			       gint width, gint height)
{
  guchar* primary_data;
  guchar* aux_data;
  GPixelRgn pixel_rgn;

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  IFDBG printf("Extracting primary channel data (%d channels)\n"
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	 "\tand %d auxiliary channels.\n", gimpstep, psstep-gimpstep);

  primary_data = xmalloc(width * height * gimpstep);
  {
    int pix,chan;

    for (pix=0; pix<width*height; pix++)
      {
	for (chan=0; chan<gimpstep; chan++)
	  {
	    primary_data [pix*gimpstep + chan] =
	      src [pix*psstep + chan];
	  }
      }
    
    gimp_pixel_rgn_init (&pixel_rgn, drawable,
			 0, 0, drawable->width, drawable->height,
			 TRUE, FALSE);
    gimp_pixel_rgn_set_rect (&pixel_rgn, primary_data,
			     0, 0, drawable->width, drawable->height);    
  
    gimp_drawable_flush (drawable);
    gimp_drawable_detach (drawable);
  }
  g_free(primary_data);


  aux_data = xmalloc(width * height);
  {
    int pix, chan;
    gint32 channel_ID;
    GDrawable* chdrawable;
    guchar colour[3]= {0, 0, 0};


    for (chan=gimpstep; chan<psstep; chan++)
      {
	for (pix=0; pix<width*height; pix++)
	  {
	    aux_data [pix] =
	      src [pix*psstep + chan];
	  }
	
	channel_ID = gimp_channel_new(image_ID,
				      psd_image.aux_channel[chan-gimpstep].name,
				      width, height,
				      100.0, colour);
	gimp_image_add_channel(image_ID, channel_ID, 0);
	gimp_channel_set_visible(channel_ID, FALSE);

	chdrawable = gimp_drawable_get(channel_ID);

	gimp_pixel_rgn_init (&pixel_rgn, chdrawable,
			     0, 0, chdrawable->width, chdrawable->height,
			     TRUE, FALSE);
	gimp_pixel_rgn_set_rect (&pixel_rgn, aux_data,
				 0, 0, chdrawable->width, chdrawable->height);
	
	gimp_drawable_flush (chdrawable);
	gimp_drawable_detach (chdrawable);
      }
  }
  g_free(aux_data);

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  IFDBG printf("Done with that.\n\n");
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}


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static
void extract_channels(guchar* src, gint num_wanted, gint psstep,
		      gint32 image_ID,
		      gint width, gint height)
{
  guchar* aux_data;
  GPixelRgn pixel_rgn;

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  IFDBG printf("Extracting %d/%d auxiliary channels.\n", num_wanted, psstep);
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  aux_data = xmalloc(width * height);
  {
    int pix, chan;
    gint32 channel_ID;
    GDrawable* chdrawable;
    guchar colour[3]= {0, 0, 0};

    for (chan=psstep-num_wanted; chan<psstep; chan++)
      {
	for (pix=0; pix<width*height; pix++)
	  {
	    aux_data [pix] =
	      src [pix*psstep + chan];
	  }
	
	channel_ID = gimp_channel_new(image_ID,
				      psd_image.aux_channel[chan-(psstep-num_wanted)].name,
				      width, height,
				      100.0, colour);
	gimp_image_add_channel(image_ID, channel_ID, 0);
	gimp_channel_set_visible(channel_ID, FALSE);

	chdrawable = gimp_drawable_get(channel_ID);

	gimp_pixel_rgn_init (&pixel_rgn, chdrawable,
			     0, 0, chdrawable->width, chdrawable->height,
			     TRUE, FALSE);
	gimp_pixel_rgn_set_rect (&pixel_rgn, aux_data,
				 0, 0, chdrawable->width, chdrawable->height);
	
	gimp_drawable_flush (chdrawable);
	gimp_drawable_detach (chdrawable);
      }
  }
  g_free(aux_data);

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  IFDBG printf("Done with that.\n\n");
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}


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static void
resize_mask(guchar* src, guchar* dest,
	    gint32 src_x, gint32 src_y,
	    gint32 src_w, gint32 src_h,
	    gint32 dest_w, gint32 dest_h)
{
  int x,y;

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  IFDBG printf("--> %p %p : %d %d . %d %d . %d %d\n",
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	 src, dest,
	 src_x, src_y,
	 src_w, src_h,
	 dest_w, dest_h);

  for (y=0; y<dest_h; y++)
    {
      for (x=0; x<dest_w; x++)
	{
	  if ((x>src_x) && (x<src_x+src_w) &&
	      (y>src_y) && (y<src_y+src_h))
	    {
	      dest[dest_w * y + x] =
		src[src_w * (y-src_y) + (x-src_x)];
	    }
	  else
	    {
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	      dest[dest_w * y + x] = 255;
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	    }
	}
    }
}


static gint32
load_image(char *name)
{
  FILE *fd;
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