gtk2/modules/engines/pixbuf/pixbuf-main.c

/* GTK+ Pixbuf Engine
 * Copyright (C) 1998-2000 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Written by Owen Taylor <otaylor@redhat.com>, based on code by
 * Carsten Haitzler <raster@rasterman.com>
 */

#include "pixbuf.h"
#include <gmodule.h>

/* Theme functions to export */
void                theme_init(GtkThemeEngine * engine);
void                theme_exit(void);

static struct
  {
    gchar              *name;
    guint               token;
  }
theme_symbols[] =
{
  { "image", 		TOKEN_IMAGE  },
  { "function", 	TOKEN_FUNCTION },
  { "file", 		TOKEN_FILE },
  { "stretch", 		TOKEN_STRETCH },
  { "recolorable", 	TOKEN_RECOLORABLE },
  { "border", 		TOKEN_BORDER },
  { "detail", 		TOKEN_DETAIL },
  { "state", 		TOKEN_STATE },
  { "shadow", 		TOKEN_SHADOW },
  { "gap_side", 	TOKEN_GAP_SIDE },
  { "gap_file", 	TOKEN_GAP_FILE },
  { "gap_border", 	TOKEN_GAP_BORDER },
  { "gap_start_file", 	TOKEN_GAP_START_FILE },
  { "gap_start_border", TOKEN_GAP_START_BORDER },
  { "gap_end_file", 	TOKEN_GAP_END_FILE },
  { "gap_end_border", 	TOKEN_GAP_END_BORDER },
  { "overlay_file", 	TOKEN_OVERLAY_FILE },
  { "overlay_border", 	TOKEN_OVERLAY_BORDER },
  { "overlay_stretch", 	TOKEN_OVERLAY_STRETCH },
  { "arrow_direction", 	TOKEN_ARROW_DIRECTION },
  { "orientation", 	TOKEN_ORIENTATION },

  { "HLINE", 		TOKEN_D_HLINE },
  { "VLINE",		TOKEN_D_VLINE },
  { "SHADOW",		TOKEN_D_SHADOW },
  { "POLYGON",		TOKEN_D_POLYGON },
  { "ARROW",		TOKEN_D_ARROW },
  { "DIAMOND",		TOKEN_D_DIAMOND },
  { "OVAL",		TOKEN_D_OVAL },
  { "STRING",		TOKEN_D_STRING },
  { "BOX",		TOKEN_D_BOX },
  { "FLAT_BOX",		TOKEN_D_FLAT_BOX },
  { "CHECK",		TOKEN_D_CHECK },
  { "OPTION",		TOKEN_D_OPTION },
  { "CROSS",		TOKEN_D_CROSS },
  { "RAMP",		TOKEN_D_RAMP },
  { "TAB",		TOKEN_D_TAB },
  { "SHADOW_GAP",	TOKEN_D_SHADOW_GAP },
  { "BOX_GAP",		TOKEN_D_BOX_GAP },
  { "EXTENSION",	TOKEN_D_EXTENSION },
  { "FOCUS",		TOKEN_D_FOCUS },
  { "SLIDER",		TOKEN_D_SLIDER },
  { "ENTRY",		TOKEN_D_ENTRY },
  { "HANDLE",		TOKEN_D_HANDLE },

  { "TRUE",		TOKEN_TRUE },
  { "FALSE",		TOKEN_FALSE },

  { "TOP",		TOKEN_TOP },
  { "UP",		TOKEN_UP },
  { "BOTTOM",		TOKEN_BOTTOM },
  { "DOWN",		TOKEN_DOWN },
  { "LEFT",		TOKEN_LEFT },
  { "RIGHT",		TOKEN_RIGHT },

  { "NORMAL",		TOKEN_NORMAL },
  { "ACTIVE",		TOKEN_ACTIVE },
  { "PRELIGHT",		TOKEN_PRELIGHT },
  { "SELECTED",		TOKEN_SELECTED },
  { "INSENSITIVE",	TOKEN_INSENSITIVE },

  { "NONE",		TOKEN_NONE },
  { "IN",		TOKEN_IN },
  { "OUT",		TOKEN_OUT },
  { "ETCHED_IN",	TOKEN_ETCHED_IN },
  { "ETCHED_OUT",	TOKEN_ETCHED_OUT },
  { "HORIZONTAL",	TOKEN_HORIZONTAL },
  { "VERTICAL",		TOKEN_VERTICAL },
};

static guint        n_theme_symbols = sizeof(theme_symbols) / sizeof(theme_symbols[0]);

static guint
theme_parse_file(GScanner     *scanner,
		 ThemePixbuf **theme_pb)
{
  guint token;
  gchar *pixmap;

  /* Skip 'blah_file' */
  token = g_scanner_get_next_token(scanner);

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_STRING)
    return G_TOKEN_STRING;

  if (!*theme_pb)
    *theme_pb = theme_pixbuf_new ();

  pixmap = gtk_rc_find_pixmap_in_path(scanner, scanner->value.v_string);
  if (pixmap)
    {
      theme_pixbuf_set_filename (*theme_pb, pixmap);
      g_free (pixmap);
    }

  return G_TOKEN_NONE;
}

static guint
theme_parse_border (GScanner     *scanner,
		    ThemePixbuf **theme_pb)
{
  guint               token;
  gint left, right, top, bottom;

  /* Skip 'blah_border' */
  token = g_scanner_get_next_token(scanner);

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_LEFT_CURLY)
    return G_TOKEN_LEFT_CURLY;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_INT)
    return G_TOKEN_INT;
  left = scanner->value.v_int;
  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_COMMA)
    return G_TOKEN_COMMA;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_INT)
    return G_TOKEN_INT;
  right = scanner->value.v_int;
  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_COMMA)
    return G_TOKEN_COMMA;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_INT)
    return G_TOKEN_INT;
  top = scanner->value.v_int;
  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_COMMA)
    return G_TOKEN_COMMA;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_INT)
    return G_TOKEN_INT;
  bottom = scanner->value.v_int;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_RIGHT_CURLY)
    return G_TOKEN_RIGHT_CURLY;

  if (!*theme_pb)
    *theme_pb = theme_pixbuf_new ();
  
  theme_pixbuf_set_border (*theme_pb, left, right, top, bottom);
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_stretch(GScanner     *scanner,
		    ThemePixbuf **theme_pb)
{
  guint token;
  gboolean stretch;

  /* Skip 'blah_stretch' */
  token = g_scanner_get_next_token(scanner);

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token == TOKEN_TRUE)
    stretch = TRUE;
  else if (token == TOKEN_FALSE)
    stretch = FALSE;
  else
    return TOKEN_TRUE;

  if (!*theme_pb)
    *theme_pb = theme_pixbuf_new ();
  
  theme_pixbuf_set_stretch (*theme_pb, stretch);
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_recolorable(GScanner * scanner,
			ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_RECOLORABLE)
    return TOKEN_RECOLORABLE;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token == TOKEN_TRUE)
    data->recolorable = 1;
  else if (token == TOKEN_FALSE)
    data->recolorable = 0;
  else
    return TOKEN_TRUE;

  return G_TOKEN_NONE;
}

static guint
theme_parse_function(GScanner * scanner,
		     ThemeImage *data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_FUNCTION)
    return TOKEN_FUNCTION;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if ((token >= TOKEN_D_HLINE) && (token <= TOKEN_D_HANDLE))
    data->match_data.function = token;

  return G_TOKEN_NONE;
}

static guint
theme_parse_detail(GScanner * scanner,
		   ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_DETAIL)
    return TOKEN_DETAIL;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_STRING)
    return G_TOKEN_STRING;

  if (data->match_data.detail)
    g_free (data->match_data.detail);
  
  data->match_data.detail = g_strdup(scanner->value.v_string);

  return G_TOKEN_NONE;
}

static guint
theme_parse_state(GScanner * scanner,
		  ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_STATE)
    return TOKEN_STATE;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token == TOKEN_NORMAL)
    data->match_data.state = GTK_STATE_NORMAL;
  else if (token == TOKEN_ACTIVE)
    data->match_data.state = GTK_STATE_ACTIVE;
  else if (token == TOKEN_PRELIGHT)
    data->match_data.state = GTK_STATE_PRELIGHT;
  else if (token == TOKEN_SELECTED)
    data->match_data.state = GTK_STATE_SELECTED;
  else if (token == TOKEN_INSENSITIVE)
    data->match_data.state = GTK_STATE_INSENSITIVE;
  else
    return TOKEN_NORMAL;

  data->match_data.flags |= THEME_MATCH_STATE;
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_shadow(GScanner * scanner,
		   ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_SHADOW)
    return TOKEN_SHADOW;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token == TOKEN_NONE)
    data->match_data.shadow = GTK_SHADOW_NONE;
  else if (token == TOKEN_IN)
    data->match_data.shadow = GTK_SHADOW_IN;
  else if (token == TOKEN_OUT)
    data->match_data.shadow = GTK_SHADOW_OUT;
  else if (token == TOKEN_ETCHED_IN)
    data->match_data.shadow = GTK_SHADOW_ETCHED_IN;
  else if (token == TOKEN_ETCHED_OUT)
    data->match_data.shadow = GTK_SHADOW_ETCHED_OUT;
  else
    return TOKEN_NONE;

  data->match_data.flags |= THEME_MATCH_SHADOW;
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_arrow_direction(GScanner * scanner,
			    ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_ARROW_DIRECTION)
    return TOKEN_ARROW_DIRECTION;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);
  if (token == TOKEN_UP)
    data->match_data.arrow_direction = GTK_ARROW_UP;
  else if (token == TOKEN_DOWN)
    data->match_data.arrow_direction = GTK_ARROW_DOWN;
  else if (token == TOKEN_LEFT)
    data->match_data.arrow_direction = GTK_ARROW_LEFT;
  else if (token == TOKEN_RIGHT)
    data->match_data.arrow_direction = GTK_ARROW_RIGHT;
  else
    return TOKEN_UP;

  data->match_data.flags |= THEME_MATCH_ARROW_DIRECTION;
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_gap_side(GScanner * scanner,
		     ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_GAP_SIDE)
    return TOKEN_GAP_SIDE;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);

  if (token == TOKEN_TOP)
    data->match_data.gap_side = GTK_POS_TOP;
  else if (token == TOKEN_BOTTOM)
    data->match_data.gap_side = GTK_POS_BOTTOM;
  else if (token == TOKEN_LEFT)
    data->match_data.gap_side = GTK_POS_LEFT;
  else if (token == TOKEN_RIGHT)
    data->match_data.gap_side = GTK_POS_RIGHT;
  else
    return TOKEN_TOP;

  data->match_data.flags |= THEME_MATCH_GAP_SIDE;
  
  return G_TOKEN_NONE;
}

static guint
theme_parse_orientation(GScanner * scanner,
			ThemeImage * data)
{
  guint               token;

  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_ORIENTATION)
    return TOKEN_ORIENTATION;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_EQUAL_SIGN)
    return G_TOKEN_EQUAL_SIGN;

  token = g_scanner_get_next_token(scanner);

  if (token == TOKEN_HORIZONTAL)
    data->match_data.orientation = GTK_ORIENTATION_HORIZONTAL;
  else if (token == TOKEN_VERTICAL)
    data->match_data.orientation = GTK_ORIENTATION_VERTICAL;
  else
    return TOKEN_HORIZONTAL;

  data->match_data.flags |= THEME_MATCH_ORIENTATION;
  
  return G_TOKEN_NONE;
}

static void
theme_image_ref (ThemeImage *data)
{
  data->refcount++;
}

static void
theme_image_unref (ThemeImage *data)
{
  data->refcount--;
  if (data->refcount == 0)
    {
      if (data->match_data.detail)
	g_free (data->match_data.detail);
      if (data->background)
	theme_pixbuf_destroy (data->background);
      if (data->overlay)
	theme_pixbuf_destroy (data->overlay);
      if (data->gap_start)
	theme_pixbuf_destroy (data->gap_start);
      if (data->gap)
	theme_pixbuf_destroy (data->gap);
      if (data->gap_end)
	theme_pixbuf_destroy (data->gap_end);
      g_free (data);
    }
}

static void
theme_data_ref (ThemeData *theme_data)
{
  theme_data->refcount++;
}

static void
theme_data_unref (ThemeData *theme_data)
{
  theme_data->refcount--;
  if (theme_data->refcount == 0)
    {
      g_list_foreach (theme_data->img_list, (GFunc) theme_image_unref, NULL);
      g_list_free (theme_data->img_list);
      g_free (theme_data);
    }
}

static guint
theme_parse_image(GScanner *scanner,
		  ThemeData *theme_data,
		  ThemeImage **data_return)
{
  guint               token;
  ThemeImage *data;

  data = NULL;
  token = g_scanner_get_next_token(scanner);
  if (token != TOKEN_IMAGE)
    return TOKEN_IMAGE;

  token = g_scanner_get_next_token(scanner);
  if (token != G_TOKEN_LEFT_CURLY)
    return G_TOKEN_LEFT_CURLY;

  data = g_malloc(sizeof(ThemeImage));

  data->refcount = 1;

  data->background = NULL;
  data->overlay = NULL;
  data->gap_start = NULL;
  data->gap = NULL;
  data->gap_end = NULL;

  data->recolorable = FALSE;

  data->match_data.function = 0;
  data->match_data.detail = NULL;
  data->match_data.flags = 0;

  token = g_scanner_peek_next_token(scanner);
  while (token != G_TOKEN_RIGHT_CURLY)
    {
      switch (token)
	{
	case TOKEN_FUNCTION:
	  token = theme_parse_function(scanner, data);
	  break;
	case TOKEN_RECOLORABLE:
	  token = theme_parse_recolorable(scanner, data);
	  break;
	case TOKEN_DETAIL:
	  token = theme_parse_detail(scanner, data);
	  break;
	case TOKEN_STATE:
	  token = theme_parse_state(scanner, data);
	  break;
	case TOKEN_SHADOW:
	  token = theme_parse_shadow(scanner, data);
	  break;
	case TOKEN_GAP_SIDE:
	  token = theme_parse_gap_side(scanner, data);
	  break;
	case TOKEN_ARROW_DIRECTION:
	  token = theme_parse_arrow_direction(scanner, data);
	  break;
	case TOKEN_ORIENTATION:
	  token = theme_parse_orientation(scanner, data);
	  break;
	case TOKEN_FILE:
	  token = theme_parse_file(scanner, &data->background);
	  break;
	case TOKEN_BORDER:
	  token = theme_parse_border(scanner, &data->background);
	  break;
	case TOKEN_STRETCH:
	  token = theme_parse_stretch(scanner, &data->background);
	  break;
	case TOKEN_GAP_FILE:
	  token = theme_parse_file(scanner, &data->gap);
	  break;
	case TOKEN_GAP_BORDER:
	  token = theme_parse_border(scanner, &data->gap);
	  break;
	case TOKEN_GAP_START_FILE:
	  token = theme_parse_file(scanner, &data->gap_start);
	  break;
	case TOKEN_GAP_START_BORDER:
	  token = theme_parse_border(scanner, &data->gap_start);
	  break;
	case TOKEN_GAP_END_FILE:
	  token = theme_parse_file(scanner, &data->gap_end);
	  break;
	case TOKEN_GAP_END_BORDER:
	  token = theme_parse_border(scanner, &data->gap_end);
	  break;
	case TOKEN_OVERLAY_FILE:
	  token = theme_parse_file(scanner, &data->overlay);
	  break;
	case TOKEN_OVERLAY_BORDER:
	  token = theme_parse_border(scanner, &data->overlay);
	  break;
	case TOKEN_OVERLAY_STRETCH:
	  token = theme_parse_stretch(scanner, &data->overlay);
	  break;
	default:
	  g_scanner_get_next_token(scanner);
	  token = G_TOKEN_RIGHT_CURLY;
	  break;
	}
      if (token != G_TOKEN_NONE)
	{
	  /* error - cleanup for exit */
	  theme_image_unref (data);
	  *data_return = NULL;
	  return token;
	}
      token = g_scanner_peek_next_token(scanner);
    }

  token = g_scanner_get_next_token(scanner);

  if (token != G_TOKEN_RIGHT_CURLY)
    {
      /* error - cleanup for exit */
      theme_image_unref (data);
      *data_return = NULL;
      return G_TOKEN_RIGHT_CURLY;
    }

  /* everything is fine now - insert yer cruft */
  *data_return = data;
  return G_TOKEN_NONE;
}

static guint
theme_parse_rc_style(GScanner * scanner,
		     GtkRcStyle * rc_style)
{
  static GQuark scope_id = 0;
  ThemeData *theme_data;
  guint old_scope;
  guint token;
  gint i;
  ThemeImage *img;
  
  /* Set up a new scope in this scanner. */

  if (!scope_id)
    scope_id = g_quark_from_string("theme_engine");

  /* If we bail out due to errors, we *don't* reset the scope, so the
   * error messaging code can make sense of our tokens.
   */
  old_scope = g_scanner_set_scope(scanner, scope_id);

  /* Now check if we already added our symbols to this scope
   * (in some previous call to theme_parse_rc_style for the
   * same scanner.
   */

  if (!g_scanner_lookup_symbol(scanner, theme_symbols[0].name))
    {
      g_scanner_freeze_symbol_table(scanner);
      for (i = 0; i < n_theme_symbols; i++)
	g_scanner_scope_add_symbol(scanner, scope_id,
				   theme_symbols[i].name,
				   GINT_TO_POINTER(theme_symbols[i].token));
      g_scanner_thaw_symbol_table(scanner);
    }

  /* We're ready to go, now parse the top level */

  theme_data = g_new(ThemeData, 1);
  theme_data->img_list = NULL;
  theme_data->refcount = 1;

  token = g_scanner_peek_next_token(scanner);
  while (token != G_TOKEN_RIGHT_CURLY)
    {
      switch (token)
	{
	case TOKEN_IMAGE:
	  img = NULL;
	  token = theme_parse_image(scanner, theme_data, &img);
	  break;
	default:
	  g_scanner_get_next_token(scanner);
	  token = G_TOKEN_RIGHT_CURLY;
	  break;
	}

      if (token != G_TOKEN_NONE)
	{
	  g_list_foreach (theme_data->img_list, (GFunc)theme_image_unref, NULL);
	  g_list_free (theme_data->img_list);
	  g_free (theme_data);
	  return token;
	}
      else
	{
	  theme_data->img_list = g_list_append(theme_data->img_list, img);
	}
      token = g_scanner_peek_next_token(scanner);
    }

  g_scanner_get_next_token(scanner);

  rc_style->engine_data = theme_data;
  g_scanner_set_scope(scanner, old_scope);

  return G_TOKEN_NONE;
}

static void
theme_merge_rc_style(GtkRcStyle * dest,
		     GtkRcStyle * src)
{
  ThemeData        *src_data = src->engine_data;
  ThemeData        *dest_data = dest->engine_data;
  GList *tmp_list1, *tmp_list2;

  if (!dest_data)
    {
      dest_data = g_new(ThemeData, 1);
      dest_data->img_list = NULL;
      dest_data->refcount = 1;
      dest->engine_data = dest_data;
    }

  if (src_data->img_list)
    {
      /* Copy src image list and append to dest image list */

      tmp_list2 = g_list_last (dest_data->img_list);
      tmp_list1 = src_data->img_list;
      
      while (tmp_list1)
	{
	  if (tmp_list2)
	    {
	      tmp_list2->next = g_list_alloc();
	      tmp_list2->next->data = tmp_list1->data;
	      tmp_list2->next->prev = tmp_list2;

	      tmp_list2 = tmp_list2->next;
	    }
	  else
	    {
	      dest_data->img_list = g_list_append (NULL, tmp_list1->data);
	      tmp_list2 = dest_data->img_list;
	    }
	  
	  theme_data_ref (tmp_list1->data);
	  tmp_list1 = tmp_list1->next;
	}
    }
}

static void
theme_rc_style_to_style(GtkStyle * style,
			GtkRcStyle * rc_style)
{
  ThemeData        *data = rc_style->engine_data;

  style->klass = &pixmap_default_class;
  style->engine_data = data;
  theme_data_ref (data);
}

static void
theme_duplicate_style(GtkStyle * dest,
		      GtkStyle * src)
{
  ThemeData     *src_data = src->engine_data;
  ThemeData     *dest_data;

  dest_data = g_new(ThemeData, 1);
  dest_data->img_list = g_list_copy (src_data->img_list);
  g_list_foreach (dest_data->img_list, (GFunc)theme_image_ref, NULL);

  dest->klass = &pixmap_default_class;
  dest->engine_data = dest_data;
  theme_data_ref (dest_data);
}

static void
theme_realize_style(GtkStyle * style)
{
}

static void
theme_unrealize_style(GtkStyle * style)
{
}

static void
theme_destroy_rc_style(GtkRcStyle * rc_style)
{
  theme_data_unref (rc_style->engine_data);
}

static void
theme_destroy_style(GtkStyle * style)
{
  theme_data_unref (style->engine_data);
}

static void
theme_set_background(GtkStyle * style,
		     GdkWindow * window,
		     GtkStateType state_type)
{
  GdkPixmap          *pixmap;
  gint                parent_relative;

  g_return_if_fail(style != NULL);
  g_return_if_fail(window != NULL);

  if (style->bg_pixmap[state_type])
    {
      if (style->bg_pixmap[state_type] == (GdkPixmap *) GDK_PARENT_RELATIVE)
	{
	  pixmap = NULL;
	  parent_relative = TRUE;
	}
      else
	{
	  pixmap = style->bg_pixmap[state_type];
	  parent_relative = FALSE;
	}

      gdk_window_set_back_pixmap(window, pixmap, parent_relative);
    }
  else
    gdk_window_set_background(window, &style->bg[state_type]);
}

void
theme_init(GtkThemeEngine * engine)
{
  engine->parse_rc_style = theme_parse_rc_style;
  engine->merge_rc_style = theme_merge_rc_style;
  engine->rc_style_to_style = theme_rc_style_to_style;
  engine->duplicate_style = theme_duplicate_style;
  engine->realize_style = theme_realize_style;
  engine->unrealize_style = theme_unrealize_style;
  engine->destroy_rc_style = theme_destroy_rc_style;
  engine->destroy_style = theme_destroy_style;
  engine->set_background = theme_set_background;

  gdk_rgb_init();

  /*
   * We enable the caches unconditionally (the -1 is used
   * to inform gnome-libs to ignore its setting for the
   * cache
   */
#if 0
  gtk_widget_push_visual(gdk_imlib_get_visual());
  gtk_widget_push_colormap(gdk_imlib_get_colormap());
#endif /* 0 */  
}

void
theme_exit(void)
{
}

/* The following function will be called by GTK+ when the module
 * is loaded and checks to see if we are compatible with the
 * version of GTK+ that loads us.
 */
G_MODULE_EXPORT const gchar* g_module_check_init (GModule *module);
const gchar*
g_module_check_init (GModule *module)
{
  return gtk_check_version (GTK_MAJOR_VERSION,
			    GTK_MINOR_VERSION,
			    GTK_MICRO_VERSION - GTK_INTERFACE_AGE);
}