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/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
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/*
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 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
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 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

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#include <math.h>
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#include <string.h>
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#include "gtkgc.h"
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#include "gtkrc.h"
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#include "gtkstyle.h"
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#include "gtkwidget.h"
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#include "gtkthemes.h"
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#include "gtkiconfactory.h"
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#define LIGHTNESS_MULT  1.3
#define DARKNESS_MULT   0.7

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/* actually glib should do that for us */
#ifndef M_PI
#define M_PI    3.14159265358979323846
#endif /* M_PI */
#ifndef M_PI_4
#define M_PI_4  0.78539816339744830962
#endif /* M_PI_4 */

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static void         gtk_style_realize (GtkStyle    *style,
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                                       GdkColormap *colormap);

static void      gtk_style_real_realize        (GtkStyle     *style);
static void      gtk_style_real_unrealize      (GtkStyle     *style);
static void      gtk_style_real_copy           (GtkStyle     *style,
						GtkStyle     *src);
static void      gtk_style_real_set_background (GtkStyle     *style,
						GdkWindow    *window,
						GtkStateType  state_type);
static GtkStyle *gtk_style_real_clone          (GtkStyle     *style);
static void      gtk_style_real_init_from_rc   (GtkStyle     *style,
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                                                GtkRcStyle   *rc_style);


static GdkPixbuf *gtk_default_render_icon      (GtkStyle            *style,
                                                const GtkIconSource *source,
                                                GtkTextDirection     direction,
                                                GtkStateType         state,
                                                const gchar         *size,
                                                GtkWidget           *widget,
                                                const gchar         *detail);
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static void gtk_default_draw_hline      (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x1,
					 gint             x2,
					 gint             y);
static void gtk_default_draw_vline      (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             y1,
					 gint             y2,
					 gint             x);
static void gtk_default_draw_shadow     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_shadow     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_polygon    (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 GdkPoint        *points,
					 gint             npoints,
					 gboolean         fill);
static void gtk_default_draw_arrow      (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 GtkArrowType     arrow_type,
					 gboolean         fill,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_diamond    (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_string     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 const gchar     *string);
static void gtk_default_draw_box        (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_flat_box   (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_check      (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_option     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_tab        (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_shadow_gap (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height,
					 GtkPositionType  gap_side,
					 gint             gap_x,
					 gint             gap_width);
static void gtk_default_draw_box_gap    (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height,
					 GtkPositionType  gap_side,
					 gint             gap_x,
					 gint             gap_width);
static void gtk_default_draw_extension  (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height,
					 GtkPositionType  gap_side);
static void gtk_default_draw_focus      (GtkStyle        *style,
					 GdkWindow       *window,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height);
static void gtk_default_draw_slider     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height,
					 GtkOrientation   orientation);
static void gtk_default_draw_handle     (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 gint             x,
					 gint             y,
					 gint             width,
					 gint             height,
					 GtkOrientation   orientation);
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static void gtk_default_draw_expander   (GtkStyle        *style,
                                         GdkWindow       *window,
                                         GtkStateType     state_type,
                                         GdkRectangle    *area,
                                         GtkWidget       *widget,
                                         const gchar     *detail,
                                         gint             x,
                                         gint             y,
                                         gboolean         is_open);
static void gtk_default_draw_layout     (GtkStyle        *style,
                                         GdkWindow       *window,
                                         GtkStateType     state_type,
                                         GdkRectangle    *area,
                                         GtkWidget       *widget,
                                         const gchar     *detail,
                                         gint             x,
                                         gint             y,
                                         PangoLayout     *layout);
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static void gtk_style_shade (GdkColor *a, GdkColor *b, gdouble k);
static void rgb_to_hls (gdouble *r, gdouble *g, gdouble *b);
static void hls_to_rgb (gdouble *h, gdouble *l, gdouble *s);

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GdkFont *default_font = NULL;
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static GdkColor gtk_default_normal_fg =      { 0,      0,      0,      0 };
static GdkColor gtk_default_active_fg =      { 0,      0,      0,      0 };
static GdkColor gtk_default_prelight_fg =    { 0,      0,      0,      0 };
static GdkColor gtk_default_selected_fg =    { 0, 0xffff, 0xffff, 0xffff };
static GdkColor gtk_default_insensitive_fg = { 0, 0x7530, 0x7530, 0x7530 };

static GdkColor gtk_default_normal_bg =      { 0, 0xd6d6, 0xd6d6, 0xd6d6 };
static GdkColor gtk_default_active_bg =      { 0, 0xc350, 0xc350, 0xc350 };
static GdkColor gtk_default_prelight_bg =    { 0, 0xea60, 0xea60, 0xea60 };
static GdkColor gtk_default_selected_bg =    { 0,      0,      0, 0x9c40 };
static GdkColor gtk_default_insensitive_bg = { 0, 0xd6d6, 0xd6d6, 0xd6d6 };

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static gpointer parent_class = NULL;

static void gtk_style_init       (GtkStyle      *style);
static void gtk_style_class_init (GtkStyleClass *klass);
static void gtk_style_finalize   (GObject       *object);

GType
gtk_style_get_type (void)
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{
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  static GType object_type = 0;
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  if (!object_type)
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    {
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      static const GTypeInfo object_info =
      {
        sizeof (GtkStyleClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gtk_style_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GtkStyle),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gtk_style_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GtkStyle",
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                                            &object_info, 0);
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    }
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  return object_type;
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}
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static void
gtk_style_init (GtkStyle *style)
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{
  gint i;
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  style->font_desc = pango_font_description_from_string ("Sans 10");
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  if (!default_font)
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    {
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      default_font = gdk_font_from_description (style->font_desc);

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      if (!default_font) 
	default_font = gdk_font_load ("fixed");

      if (!default_font) 
	g_error ("Unable to load \"fixed\" font!");
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    }
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  style->font = default_font;
  gdk_font_ref (style->font);
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  style->attach_count = 0;
  style->colormap = NULL;
  style->depth = -1;
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  style->black.red = 0;
  style->black.green = 0;
  style->black.blue = 0;
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  style->white.red = 65535;
  style->white.green = 65535;
  style->white.blue = 65535;
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  style->black_gc = NULL;
  style->white_gc = NULL;
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  style->fg[GTK_STATE_NORMAL] = gtk_default_normal_fg;
  style->fg[GTK_STATE_ACTIVE] = gtk_default_active_fg;
  style->fg[GTK_STATE_PRELIGHT] = gtk_default_prelight_fg;
  style->fg[GTK_STATE_SELECTED] = gtk_default_selected_fg;
  style->fg[GTK_STATE_INSENSITIVE] = gtk_default_insensitive_fg;
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  style->bg[GTK_STATE_NORMAL] = gtk_default_normal_bg;
  style->bg[GTK_STATE_ACTIVE] = gtk_default_active_bg;
  style->bg[GTK_STATE_PRELIGHT] = gtk_default_prelight_bg;
  style->bg[GTK_STATE_SELECTED] = gtk_default_selected_bg;
  style->bg[GTK_STATE_INSENSITIVE] = gtk_default_insensitive_bg;
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  for (i = 0; i < 4; i++)
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    {
      style->text[i] = style->fg[i];
      style->base[i] = style->white;
    }
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  style->base[GTK_STATE_INSENSITIVE] = gtk_default_prelight_bg;
  style->text[GTK_STATE_INSENSITIVE] = gtk_default_insensitive_fg;
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  for (i = 0; i < 5; i++)
    style->bg_pixmap[i] = NULL;
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  style->rc_style = NULL;
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  for (i = 0; i < 5; i++)
    {
      style->fg_gc[i] = NULL;
      style->bg_gc[i] = NULL;
      style->light_gc[i] = NULL;
      style->dark_gc[i] = NULL;
      style->mid_gc[i] = NULL;
      style->text_gc[i] = NULL;
      style->base_gc[i] = NULL;
    }
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  style->xthickness = 2;
  style->ythickness = 2;
}

static void
gtk_style_class_init (GtkStyleClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);
  
  parent_class = g_type_class_peek_parent (klass);

  object_class->finalize = gtk_style_finalize;

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  klass->clone = gtk_style_real_clone;
  klass->copy = gtk_style_real_copy;
  klass->init_from_rc = gtk_style_real_init_from_rc;
  klass->realize = gtk_style_real_realize;
  klass->unrealize = gtk_style_real_unrealize;
  klass->set_background = gtk_style_real_set_background;
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  klass->render_icon = gtk_default_render_icon;

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  klass->draw_hline = gtk_default_draw_hline;
  klass->draw_vline = gtk_default_draw_vline;
  klass->draw_shadow = gtk_default_draw_shadow;
  klass->draw_polygon = gtk_default_draw_polygon;
  klass->draw_arrow = gtk_default_draw_arrow;
  klass->draw_diamond = gtk_default_draw_diamond;
  klass->draw_string = gtk_default_draw_string;
  klass->draw_box = gtk_default_draw_box;
  klass->draw_flat_box = gtk_default_draw_flat_box;
  klass->draw_check = gtk_default_draw_check;
  klass->draw_option = gtk_default_draw_option;
  klass->draw_tab = gtk_default_draw_tab;
  klass->draw_shadow_gap = gtk_default_draw_shadow_gap;
  klass->draw_box_gap = gtk_default_draw_box_gap;
  klass->draw_extension = gtk_default_draw_extension;
  klass->draw_focus = gtk_default_draw_focus;
  klass->draw_slider = gtk_default_draw_slider;
  klass->draw_handle = gtk_default_draw_handle;
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  klass->draw_expander = gtk_default_draw_expander;
  klass->draw_layout = gtk_default_draw_layout;
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}

static void
gtk_style_finalize (GObject *object)
{
  GtkStyle *style = GTK_STYLE (object);

  g_return_if_fail (style->attach_count == 0);
  
  if (style->styles)
    {
      if (style->styles->data != style)
        g_slist_remove (style->styles, style);
      else
        {
          GSList *tmp_list = style->styles->next;
	  
          while (tmp_list)
            {
              ((GtkStyle*) tmp_list->data)->styles = style->styles->next;
              tmp_list = tmp_list->next;
            }
          g_slist_free_1 (style->styles);
        }
    }
  
  gdk_font_unref (style->font);
  pango_font_description_free (style->font_desc);
  
  if (style->rc_style)
    gtk_rc_style_unref (style->rc_style);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}


GtkStyle*
gtk_style_copy (GtkStyle *style)
{
  GtkStyle *new_style;
  
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  g_return_val_if_fail (GTK_IS_STYLE (style), NULL);
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  new_style = GTK_STYLE_GET_CLASS (style)->clone (style);
  GTK_STYLE_GET_CLASS (style)->copy (new_style, style);
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  return new_style;
}

static GtkStyle*
gtk_style_duplicate (GtkStyle *style)
{
  GtkStyle *new_style;
  
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  g_return_val_if_fail (GTK_IS_STYLE (style), NULL);
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  new_style = gtk_style_copy (style);
  
  style->styles = g_slist_append (style->styles, new_style);
  new_style->styles = style->styles;  
  
  return new_style;
}

GtkStyle*
gtk_style_new (void)
{
  GtkStyle *style;
  
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  style = g_object_new (GTK_TYPE_STYLE, NULL);
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  return style;
}

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/*************************************************************
 * gtk_style_attach:
 *     Attach a style to a window; this process allocates the
 *     colors and creates the GC's for the style - it specializes
 *     it to a particular visual and colormap. The process
 *     may involve the creation of a new style if the style
 *     has already been attached to a window with a different
 *     style and colormap.
 *   arguments:
 *     style:
 *     window: 
 *   results:
 *     Either the style parameter, or a newly created style.
 *     If the style is newly created, the style parameter
 *     will be dereferenced, and the new style will have
 *     a reference count belonging to the caller.
 *
 * FIXME: The sequence - 
 *    create a style => s1
 *    attach s1 to v1, c1 => s1
 *    attach s1 to v2, c2 => s2
 *    detach s1 from v1, c1
 *    attach s1 to v2, c2 => s3
 * results in two separate, unlinked styles s2 and s3 which
 * are identical and could be shared. To fix this, we would
 * want to never remove a style from the list of linked
 * styles as long as as it has a reference count. However, the 
 * disadvantage of doing it this way means that we would need two 
 * passes through the linked list when attaching (one to check for 
 * matching styles, one to look for empty unattached styles - but 
 * it will almost never be longer than 2 elements.
 *************************************************************/

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GtkStyle*
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gtk_style_attach (GtkStyle  *style,
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                  GdkWindow *window)
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{
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  GSList *styles;
  GtkStyle *new_style = NULL;
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  GdkColormap *colormap;
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  g_return_val_if_fail (GTK_IS_STYLE (style), NULL);
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  g_return_val_if_fail (window != NULL, NULL);
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  colormap = gdk_window_get_colormap (window);
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  if (!style->styles)
    style->styles = g_slist_append (NULL, style);
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  styles = style->styles;
  while (styles)
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    {
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      new_style = styles->data;
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      if (new_style->attach_count == 0)
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        {
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          gtk_style_realize (new_style, colormap);
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          break;
        }
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      else if (new_style->colormap == colormap)
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        break;
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      new_style = NULL;
      styles = styles->next;
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    }
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  if (!new_style)
    {
      new_style = gtk_style_duplicate (style);
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      gtk_style_realize (new_style, colormap);
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    }
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  /* A style gets a refcount from being attached */
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  if (new_style->attach_count == 0)
    gtk_style_ref (new_style);
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  /* Another refcount belongs to the parent */
  if (style != new_style) 
    {
      gtk_style_unref (style);
      gtk_style_ref (new_style);
    }
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  new_style->attach_count++;
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  return new_style;
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}

void
gtk_style_detach (GtkStyle *style)
{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  style->attach_count -= 1;
  if (style->attach_count == 0)
    {
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      GTK_STYLE_GET_CLASS (style)->unrealize (style);
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      gtk_style_unref (style);
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    }
}

GtkStyle*
gtk_style_ref (GtkStyle *style)
{
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  return (GtkStyle *) g_object_ref (G_OBJECT (style));
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}

void
gtk_style_unref (GtkStyle *style)
{
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  g_object_unref (G_OBJECT (style));
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}

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static void
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gtk_style_realize (GtkStyle    *style,
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                   GdkColormap *colormap)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  style->colormap = colormap;
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  style->depth = gdk_colormap_get_visual (colormap)->depth;

  GTK_STYLE_GET_CLASS (style)->realize (style);
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}

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GtkIconSet*
gtk_style_lookup_icon_set (GtkStyle   *style,
                           const char *stock_id)
{
  GSList *iter;

  g_return_val_if_fail (GTK_IS_STYLE (style), NULL);
  g_return_val_if_fail (stock_id != NULL, NULL);
  
  iter = style->icon_factories;
  while (iter != NULL)
    {
      GtkIconSet *icon_set =
        gtk_icon_factory_lookup (GTK_ICON_FACTORY (iter->data),
                                 stock_id);

      if (icon_set)
        return icon_set;
      
      iter = g_slist_next (iter);
    }

  return gtk_icon_factory_lookup_default (stock_id);
}

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void
gtk_draw_hline (GtkStyle     *style,
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                GdkWindow    *window,
                GtkStateType  state_type,
                gint          x1,
                gint          x2,
                gint          y)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_hline != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_hline (style, window, state_type, NULL, NULL, NULL, x1, x2, y);
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}


void
gtk_draw_vline (GtkStyle     *style,
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                GdkWindow    *window,
                GtkStateType  state_type,
                gint          y1,
                gint          y2,
                gint          x)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_vline != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_vline (style, window, state_type, NULL, NULL, NULL, y1, y2, x);
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}


void
gtk_draw_shadow (GtkStyle      *style,
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                 GdkWindow     *window,
                 GtkStateType   state_type,
                 GtkShadowType  shadow_type,
                 gint           x,
                 gint           y,
                 gint           width,
                 gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_shadow != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_shadow (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}

void
gtk_draw_polygon (GtkStyle      *style,
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                  GdkWindow     *window,
                  GtkStateType   state_type,
                  GtkShadowType  shadow_type,
                  GdkPoint      *points,
                  gint           npoints,
                  gboolean       fill)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_polygon != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_polygon (style, window, state_type, shadow_type, NULL, NULL, NULL, points, npoints, fill);
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}

void
gtk_draw_arrow (GtkStyle      *style,
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                GdkWindow     *window,
                GtkStateType   state_type,
                GtkShadowType  shadow_type,
                GtkArrowType   arrow_type,
                gboolean       fill,
                gint           x,
                gint           y,
                gint           width,
                gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_arrow != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_arrow (style, window, state_type, shadow_type, NULL, NULL, NULL, arrow_type, fill, x, y, width, height);
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}


void
gtk_draw_diamond (GtkStyle      *style,
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                  GdkWindow     *window,
                  GtkStateType   state_type,
                  GtkShadowType  shadow_type,
                  gint           x,
                  gint           y,
                  gint           width,
                  gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_diamond != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_diamond (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}


void
gtk_draw_string (GtkStyle      *style,
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                 GdkWindow     *window,
                 GtkStateType   state_type,
                 gint           x,
                 gint           y,
                 const gchar   *string)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_string != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_string (style, window, state_type, NULL, NULL, NULL, x, y, string);
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}

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void
gtk_draw_box (GtkStyle      *style,
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              GdkWindow     *window,
              GtkStateType   state_type,
              GtkShadowType  shadow_type,
              gint           x,
              gint           y,
              gint           width,
              gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_box != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_box (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}

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void
gtk_draw_flat_box (GtkStyle      *style,
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                   GdkWindow     *window,
                   GtkStateType   state_type,
                   GtkShadowType  shadow_type,
                   gint           x,
                   gint           y,
                   gint           width,
                   gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_flat_box != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_flat_box (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}

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void
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gtk_draw_check (GtkStyle      *style,
                GdkWindow     *window,
                GtkStateType   state_type,
                GtkShadowType  shadow_type,
                gint           x,
                gint           y,
                gint           width,
                gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_check != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_check (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}

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void
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gtk_draw_option (GtkStyle      *style,
		 GdkWindow     *window,
		 GtkStateType   state_type,
		 GtkShadowType  shadow_type,
		 gint           x,
		 gint           y,
		 gint           width,
		 gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_option != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_option (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}

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void
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gtk_draw_tab (GtkStyle      *style,
	      GdkWindow     *window,
	      GtkStateType   state_type,
	      GtkShadowType  shadow_type,
	      gint           x,
	      gint           y,
	      gint           width,
	      gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_tab != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_tab (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}
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void
gtk_draw_shadow_gap (GtkStyle       *style,
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                     GdkWindow      *window,
                     GtkStateType    state_type,
                     GtkShadowType   shadow_type,
                     gint            x,
                     gint            y,
                     gint            width,
                     gint            height,
                     GtkPositionType gap_side,
                     gint            gap_x,
                     gint            gap_width)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_shadow_gap != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_shadow_gap (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height, gap_side, gap_x, gap_width);
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}

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void
gtk_draw_box_gap (GtkStyle       *style,
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                  GdkWindow      *window,
                  GtkStateType    state_type,
                  GtkShadowType   shadow_type,
                  gint            x,
                  gint            y,
                  gint            width,
                  gint            height,
                  GtkPositionType gap_side,
                  gint            gap_x,
                  gint            gap_width)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_box_gap != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_box_gap (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height, gap_side, gap_x, gap_width);
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}
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void
gtk_draw_extension (GtkStyle       *style,
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                    GdkWindow      *window,
                    GtkStateType    state_type,
                    GtkShadowType   shadow_type,
                    gint            x,
                    gint            y,
                    gint            width,
                    gint            height,
                    GtkPositionType gap_side)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_extension != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_extension (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height, gap_side);
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}

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void
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gtk_draw_focus (GtkStyle      *style,
		GdkWindow     *window,
		gint           x,
		gint           y,
		gint           width,
		gint           height)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_focus != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_focus (style, window, NULL, NULL, NULL, x, y, width, height);
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}

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void 
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gtk_draw_slider (GtkStyle      *style,
		 GdkWindow     *window,
		 GtkStateType   state_type,
		 GtkShadowType  shadow_type,
		 gint           x,
		 gint           y,
		 gint           width,
		 gint           height,
		 GtkOrientation orientation)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_slider != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_slider (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height, orientation);
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}

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void 
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gtk_draw_handle (GtkStyle      *style,
		 GdkWindow     *window,
		 GtkStateType   state_type,
		 GtkShadowType  shadow_type,
		 gint           x,
		 gint           y,
		 gint           width,
		 gint           height,
		 GtkOrientation orientation)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_handle != NULL);
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  GTK_STYLE_GET_CLASS (style)->draw_handle (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height, orientation);
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}

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void
gtk_draw_expander (GtkStyle        *style,
                   GdkWindow       *window,
                   GtkStateType     state_type,
                   gint             x,
                   gint             y,
                   gboolean         is_open)
{
  g_return_if_fail (GTK_IS_STYLE (style));
  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_expander != NULL);
  
  GTK_STYLE_GET_CLASS (style)->draw_expander (style, window, state_type,
                                              NULL, NULL, NULL,
                                              x, y, is_open);
}

void
gtk_draw_layout (GtkStyle        *style,
                 GdkWindow       *window,
                 GtkStateType     state_type,
                 gint             x,
                 gint             y,
                 PangoLayout     *layout)
{
  g_return_if_fail (GTK_IS_STYLE (style));
  g_return_if_fail (GTK_STYLE_GET_CLASS (style)->draw_layout != NULL);
  
  GTK_STYLE_GET_CLASS (style)->draw_layout (style, window, state_type,
                                            NULL, NULL, NULL,
                                            x, y, layout);
}

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void
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gtk_style_set_background (GtkStyle    *style,
                          GdkWindow   *window,
                          GtkStateType state_type)
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{
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (window != NULL);
  
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  GTK_STYLE_GET_CLASS (style)->set_background (style, window, state_type);
}

/* Default functions */
static GtkStyle *
gtk_style_real_clone (GtkStyle *style)
{
  return GTK_STYLE (g_object_new (G_OBJECT_TYPE (style), NULL));
}

static void
gtk_style_real_copy (GtkStyle *style,
		     GtkStyle *src)
{
  gint i;
  
  for (i = 0; i < 5; i++)
    {
      style->fg[i] = src->fg[i];
      style->bg[i] = src->bg[i];
      style->text[i] = src->text[i];
      style->base[i] = src->base[i];
      
      style->bg_pixmap[i] = src->bg_pixmap[i];
    }

  if (style->font)
    gdk_font_unref (style->font);
  style->font = src->font;
  if (style->font)
    gdk_font_ref (style->font);

  if (style->font_desc)
    pango_font_description_free (style->font_desc);
  if (src->font_desc)
    style->font_desc = pango_font_description_copy (src->font_desc);
  else
    style->font_desc = NULL;
  
  style->xthickness = src->xthickness;
  style->ythickness = src->ythickness;

  if (style->rc_style)
    gtk_rc_style_unref (style->rc_style);
  style->rc_style = src->rc_style;
  if (src->rc_style)
    gtk_rc_style_ref (src->rc_style);
}

static void
gtk_style_real_init_from_rc (GtkStyle   *style,
			     GtkRcStyle *rc_style)
{
  GdkFont *old_font;
  gint i;

  if (rc_style->font_desc)
    {
      pango_font_description_free (style->font_desc);
      style->font_desc = pango_font_description_copy (rc_style->font_desc);

      old_font = style->font;
      style->font = gdk_font_from_description (style->font_desc);
      if (style->font)
	gdk_font_unref (old_font);
      else
	style->font = old_font;
    }
    
  for (i = 0; i < 5; i++)
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    {
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      if (rc_style->color_flags[i] & GTK_RC_FG)
	style->fg[i] = rc_style->fg[i];
      if (rc_style->color_flags[i] & GTK_RC_BG)
	style->bg[i] = rc_style->bg[i];
      if (rc_style->color_flags[i] & GTK_RC_TEXT)
	style->text[i] = rc_style->text[i];
      if (rc_style->color_flags[i] & GTK_RC_BASE)
	style->base[i] = rc_style->base[i];
    }

  if (rc_style->xthickness >= 0)
    style->xthickness = rc_style->xthickness;
  if (rc_style->ythickness >= 0)
    style->ythickness = rc_style->ythickness;
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  if (rc_style->icon_factories)
    {
      GSList *iter;

      style->icon_factories = g_slist_copy (rc_style->icon_factories);
      
      iter = style->icon_factories;
      while (iter != NULL)
        {
          g_object_ref (G_OBJECT (iter->data));
          
          iter = g_slist_next (iter);
        }
    }
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}

static void
gtk_style_real_realize (GtkStyle *style)
{
  GdkGCValues gc_values;
  GdkGCValuesMask gc_values_mask;
  
  gint i;

  for (i = 0; i < 5; i++)
    {
      gtk_style_shade (&style->bg[i], &style->light[i], LIGHTNESS_MULT);
      gtk_style_shade (&style->bg[i], &style->dark[i], DARKNESS_MULT);
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      style->mid[i].red = (style->light[i].red + style->dark[i].red) / 2;
      style->mid[i].green = (style->light[i].green + style->dark[i].green) / 2;
      style->mid[i].blue = (style->light[i].blue + style->dark[i].blue) / 2;
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    }
  
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  gdk_color_black (style->colormap, &style->black);
  gdk_color_white (style->colormap, &style->white);
  
  gc_values_mask = GDK_GC_FOREGROUND | GDK_GC_FONT;
  if (style->font->type == GDK_FONT_FONT)
    {
      gc_values.font = style->font;
    }
  else if (style->font->type == GDK_FONT_FONTSET)
    {
      gc_values.font = default_font;
    }
  
  gc_values.foreground = style->black;
  style->black_gc = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
  
  gc_values.foreground = style->white;
  style->white_gc = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
  
  for (i = 0; i < 5; i++)
    {
      if (style->rc_style && style->rc_style->bg_pixmap_name[i])
        style->bg_pixmap[i] = gtk_rc_load_image (style->colormap,
                                                 &style->bg[i],
                                                 style->rc_style->bg_pixmap_name[i]);
      
      if (!gdk_color_alloc (style->colormap, &style->fg[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->fg[i].red, style->fg[i].green, style->fg[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->bg[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->bg[i].red, style->bg[i].green, style->bg[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->light[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->light[i].red, style->light[i].green, style->light[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->dark[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->dark[i].red, style->dark[i].green, style->dark[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->mid[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->mid[i].red, style->mid[i].green, style->mid[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->text[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->text[i].red, style->text[i].green, style->text[i].blue);
      if (!gdk_color_alloc (style->colormap, &style->base[i]))
        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->base[i].red, style->base[i].green, style->base[i].blue);
      
      gc_values.foreground = style->fg[i];
      style->fg_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->bg[i];
      style->bg_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->light[i];
      style->light_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->dark[i];
      style->dark_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->mid[i];
      style->mid_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->text[i];
      style->text_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
      
      gc_values.foreground = style->base[i];
      style->base_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
    }
}

static void
gtk_style_real_unrealize (GtkStyle *style)
{
  int i;

  gtk_gc_release (style->black_gc);
  gtk_gc_release (style->white_gc);
      
  for (i = 0; i < 5; i++)
    {
      gtk_gc_release (style->fg_gc[i]);
      gtk_gc_release (style->bg_gc[i]);
      gtk_gc_release (style->light_gc[i]);
      gtk_gc_release (style->dark_gc[i]);
      gtk_gc_release (style->mid_gc[i]);
      gtk_gc_release (style->text_gc[i]);
      gtk_gc_release (style->base_gc[i]);
    }
}

static void
gtk_style_real_set_background (GtkStyle    *style,
			       GdkWindow   *window,
			       GtkStateType state_type)
{
  GdkPixmap *pixmap;
  gint parent_relative;
  
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  if (style->bg_pixmap[state_type])
    {
      if (style->bg_pixmap[state_type] == (GdkPixmap*) GDK_PARENT_RELATIVE)
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        {
          pixmap = NULL;
          parent_relative = TRUE;
        }
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      else
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        {
          pixmap = style->bg_pixmap[state_type];
          parent_relative = FALSE;
        }
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      gdk_window_set_back_pixmap (window, pixmap, parent_relative);
    }
  else
    gdk_window_set_background (window, &style->bg[state_type]);
}

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GdkPixbuf *
gtk_style_render_icon (GtkStyle            *style,
                       const GtkIconSource *source,
                       GtkTextDirection     direction,
                       GtkStateType         state,
                       const gchar         *size,
                       GtkWidget           *widget,
                       const gchar         *detail)
{
  GdkPixbuf *pixbuf;
  
  g_return_val_if_fail (GTK_IS_STYLE (style), NULL);
  g_return_val_if_fail (GTK_STYLE_GET_CLASS (style)->render_icon != NULL, NULL);
  
  pixbuf = GTK_STYLE_GET_CLASS (style)->render_icon (style, source, direction, state,
                                                     size, widget, detail);

  g_return_val_if_fail (pixbuf != NULL, NULL);

  return pixbuf;
}

/* Default functions */
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void
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gtk_style_apply_default_background (GtkStyle     *style,
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                                    GdkWindow    *window,
                                    gboolean      set_bg,
                                    GtkStateType  state_type, 
                                    GdkRectangle *area, 
                                    gint          x, 
                                    gint          y, 
                                    gint          width, 
                                    gint          height)
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{
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  GdkRectangle new_rect, old_rect;
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  if (area)
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    {
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      old_rect.x = x;
      old_rect.y = y;
      old_rect.width = width;
      old_rect.height = height;
      
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      if (!gdk_rectangle_intersect (area, &old_rect, &new_rect))
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        return;
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    }
  else
    {
      new_rect.x = x;
      new_rect.y = y;
      new_rect.width = width;
      new_rect.height = height;
    }
  
  if (!style->bg_pixmap[state_type] ||
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      GDK_IS_PIXMAP (window) ||
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      (!set_bg && style->bg_pixmap[state_type] != (GdkPixmap*) GDK_PARENT_RELATIVE))
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    {
      GdkGC *gc = style->bg_gc[state_type];
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      if (style->bg_pixmap[state_type])
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        {
          gdk_gc_set_fill (gc, GDK_TILED);
          gdk_gc_set_tile (gc, style->bg_pixmap[state_type]);
        }
      
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      gdk_draw_rectangle (window, gc, TRUE, 
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                          new_rect.x, new_rect.y, new_rect.width, new_rect.height);
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      if (style->bg_pixmap[state_type])
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        gdk_gc_set_fill (gc, GDK_SOLID);
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    }
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  else
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    {
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      if (set_bg)
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        {
          if (style->bg_pixmap[state_type] == (GdkPixmap*) GDK_PARENT_RELATIVE)
            gdk_window_set_back_pixmap (window, NULL, TRUE);
          else
            gdk_window_set_back_pixmap (window, style->bg_pixmap[state_type], FALSE);
        }
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      gdk_window_clear_area (window, 
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                             new_rect.x, new_rect.y, 
                             new_rect.width, new_rect.height);
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    }
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}

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static GdkPixbuf*
scale_or_ref (GdkPixbuf *src,
              gint width,
              gint height)
{
  if (width == gdk_pixbuf_get_width (src) &&
      height == gdk_pixbuf_get_height (src))
    {
      gdk_pixbuf_ref (src);
      return src;
    }
  else
    {
      return gdk_pixbuf_scale_simple (src,
                                      width, height,
                                      GDK_INTERP_BILINEAR);
    }
}

static GdkPixbuf *
gtk_default_render_icon (GtkStyle            *style,
                          const GtkIconSource *source,
                          GtkTextDirection     direction,
                          GtkStateType         state,
                          const gchar         *size,
                          GtkWidget           *widget,
                          const gchar         *detail)
{
  gint width = 1;
  gint height = 1;
  GdkPixbuf *scaled;
  GdkPixbuf *stated;

  /* Oddly, style can be NULL in this function, because
   * GtkIconSet can be used without a style and if so
   * it uses this function.
   */
  
  g_return_val_if_fail (source->pixbuf != NULL, NULL);
  
  if (!gtk_icon_size_lookup (size, &width, &height))
    {
      g_warning ("Bad icon size '%s' passed to render_icon", size);
      return NULL;
    }

  /* If the size was wildcarded, then scale; otherwise, leave it
   * alone.
   */
  if (source->any_size)
    scaled = scale_or_ref (source->pixbuf, width, height);
  else
    scaled = GDK_PIXBUF (g_object_ref (G_OBJECT (source->pixbuf)));

  /* If the state was wildcarded, then generate a state. */
  if (source->any_state)
    {
      if (state == GTK_STATE_INSENSITIVE)
        {
          stated = gdk_pixbuf_copy (scaled);      
          
          gdk_pixbuf_saturate_and_pixelate (scaled, stated,
                                            0.8, TRUE);
          
          gdk_pixbuf_unref (scaled);
        }
      else if (state == GTK_STATE_PRELIGHT)
        {
          stated = gdk_pixbuf_copy (scaled);      
          
          gdk_pixbuf_saturate_and_pixelate (scaled, stated,
                                            1.2, FALSE);
          
          gdk_pixbuf_unref (scaled);
        }
      else
        {
          stated = scaled;
        }
    }
  else
    stated = scaled;
  
  return stated;
}

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static void
gtk_default_draw_hline (GtkStyle     *style,
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                        GdkWindow    *window,
                        GtkStateType  state_type,
                        GdkRectangle  *area,
                        GtkWidget     *widget,
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                        const gchar   *detail,
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                        gint          x1,
                        gint          x2,
                        gint          y)
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{
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  gint thickness_light;
  gint thickness_dark;
  gint i;
  
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (window != NULL);
  
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  thickness_light = style->ythickness / 2;
  thickness_dark = style->ythickness - thickness_light;
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  if (area)
    {
      gdk_gc_set_clip_rectangle (style->light_gc[state_type], area);
      gdk_gc_set_clip_rectangle (style->dark_gc[state_type], area);
    }
  
  if (detail && !strcmp (detail, "label"))
    {
      if (state_type == GTK_STATE_INSENSITIVE)
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        gdk_draw_line (window, style->white_gc, x1 + 1, y + 1, x2 + 1, y + 1);   
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      gdk_draw_line (window, style->fg_gc[state_type], x1, y, x2, y);     
    }
  else
    {
      for (i = 0; i < thickness_dark; i++)
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        {
          gdk_draw_line (window, style->light_gc[state_type], x2 - i - 1, y + i, x2, y + i);
          gdk_draw_line (window, style->dark_gc[state_type], x1, y + i, x2 - i - 1, y + i);
        }
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      y += thickness_dark;
      for (i = 0; i < thickness_light; i++)
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        {
          gdk_draw_line (window, style->dark_gc[state_type], x1, y + i, x1 + thickness_light - i - 1, y + i);
          gdk_draw_line (window, style->light_gc[state_type], x1 + thickness_light - i - 1, y + i, x2, y + i);
        }
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    }
  
  if (area)
    {
      gdk_gc_set_clip_rectangle (style->light_gc[state_type], NULL);
      gdk_gc_set_clip_rectangle (style->dark_gc[state_type], NULL);
    }
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}


static void
gtk_default_draw_vline (GtkStyle     *style,
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                        GdkWindow    *window,
                        GtkStateType  state_type,
                        GdkRectangle  *area,
                        GtkWidget     *widget,
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                        const gchar   *detail,
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                        gint          y1,
                        gint          y2,
                        gint          x)
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{
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  gint thickness_light;
  gint thickness_dark;
  gint i;
  
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  g_return_if_fail (GTK_IS_STYLE (style));
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  g_return_if_fail (window != NULL);
  
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  thickness_light = style->xthickness / 2;
  thickness_dark = style->xthickness - thickness_light;
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  if (area)
    {
      gdk_gc_set_clip_rectangle (style->light_gc[state_type], area);
      gdk_gc_set_clip_rectangle (style->dark_gc[state_type], area);
    }
  for (i = 0; i < thickness_dark; i++)
    {
      gdk_draw_line (window, style->light_gc[state_type], x + i, y2 - i - 1, x + i, y2);
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      gdk_draw_line (window, style->dark_gc[state_type], x + i, y1, x + i, y2 - i - 1);
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    }
  
  x += thickness_dark;