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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
 * 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
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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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/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * 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>
#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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#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_init         (GtkStyle    *style,
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                                            GdkColormap *colormap,
                                            gint         depth);
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static void         gtk_style_destroy      (GtkStyle    *style);

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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_oval       (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_cross      (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_ramp       (GtkStyle        *style,
					 GdkWindow       *window,
					 GtkStateType     state_type,
					 GtkShadowType    shadow_type,
					 GdkRectangle    *area,
					 GtkWidget       *widget,
					 const gchar     *detail,
					 GtkArrowType     arrow_type,
					 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_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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static const GtkStyleClass default_class =
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{
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  2,
  2,
  gtk_default_draw_hline,
  gtk_default_draw_vline,
  gtk_default_draw_shadow,
  gtk_default_draw_polygon,
  gtk_default_draw_arrow,
  gtk_default_draw_diamond,
  gtk_default_draw_oval,
  gtk_default_draw_string,
  gtk_default_draw_box,
  gtk_default_draw_flat_box,
  gtk_default_draw_check,
  gtk_default_draw_option,
  gtk_default_draw_cross,
  gtk_default_draw_ramp,
  gtk_default_draw_tab,
  gtk_default_draw_shadow_gap,
  gtk_default_draw_box_gap,
  gtk_default_draw_extension,
  gtk_default_draw_focus,
  gtk_default_draw_slider,
  gtk_default_draw_handle
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};
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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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GtkStyle*
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gtk_style_copy (GtkStyle *style)
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{
  GtkStyle *new_style;
  guint i;
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  g_return_val_if_fail (style != NULL, NULL);
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  new_style = gtk_style_new ();
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  for (i = 0; i < 5; i++)
    {
      new_style->fg[i] = style->fg[i];
      new_style->bg[i] = style->bg[i];
      new_style->text[i] = style->text[i];
      new_style->base[i] = style->base[i];
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      new_style->bg_pixmap[i] = style->bg_pixmap[i];
    }
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  gdk_font_unref (new_style->font);
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  new_style->font = style->font;
  gdk_font_ref (new_style->font);
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  if (style->rc_style)
    {
      new_style->rc_style = style->rc_style;
      gtk_rc_style_ref (style->rc_style);
    }
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  if (style->engine)
    {
      new_style->engine = style->engine;
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      gtk_theme_engine_ref (new_style->engine);
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      new_style->engine->duplicate_style (new_style, style);
    }

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

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GtkStyle*
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gtk_style_new (void)
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{
  GtkStyle *style;
  gint i;
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  style = g_new0 (GtkStyle, 1);
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  if (!default_font)
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    {
      default_font =
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	gdk_font_load ("-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-iso8859-1");
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      if (!default_font)
	default_font = gdk_font_load ("fixed");
      if (!default_font)
	g_error ("Unable to load default font.");
    }
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  style->font = default_font;
  gdk_font_ref (style->font);
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  style->ref_count = 1;
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  style->attach_count = 0;
  style->colormap = NULL;
  style->depth = -1;
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  style->klass = (GtkStyleClass *)&default_class;
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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->engine = NULL;
  style->engine_data = 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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  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;
  gint depth;
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  g_return_val_if_fail (style != NULL, NULL);
  g_return_val_if_fail (window != NULL, NULL);
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  colormap = gdk_window_get_colormap (window);
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  depth = gdk_window_get_visual (window)->depth;
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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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        {
          gtk_style_init (new_style, colormap, depth);
          break;
        }
      else if (new_style->colormap == colormap &&
               new_style->depth == depth)
        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);
      gtk_style_init (new_style, colormap, depth);
    }
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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)
{
  gint i;
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  g_return_if_fail (style != NULL);
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  style->attach_count -= 1;
  if (style->attach_count == 0)
    {
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      if (style->engine)
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        style->engine->unrealize_style (style);
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      gtk_gc_release (style->black_gc);
      gtk_gc_release (style->white_gc);
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      for (i = 0; i < 5; i++)
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        {
          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]);
        }
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      gtk_style_unref (style);
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    }
}

GtkStyle*
gtk_style_ref (GtkStyle *style)
{
  g_return_val_if_fail (style != NULL, NULL);
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  g_return_val_if_fail (style->ref_count > 0, NULL);
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  style->ref_count += 1;
  return style;
}

void
gtk_style_unref (GtkStyle *style)
{
  g_return_if_fail (style != NULL);
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  g_return_if_fail (style->ref_count > 0);
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  style->ref_count -= 1;
  if (style->ref_count == 0)
    gtk_style_destroy (style);
}

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static void
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gtk_style_init (GtkStyle    *style,
                GdkColormap *colormap,
                gint         depth)
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{
  GdkGCValues gc_values;
  GdkGCValuesMask gc_values_mask;
  gint i;
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  g_return_if_fail (style != NULL);
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  style->colormap = colormap;
  style->depth = depth;
  
  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);
      
      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;
    }
  
  gdk_color_black (colormap, &style->black);
  gdk_color_white (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])
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        style->bg_pixmap[i] = gtk_rc_load_image (style->colormap,
                                                 &style->bg[i],
                                                 style->rc_style->bg_pixmap_name[i]);
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      if (!gdk_color_alloc (colormap, &style->fg[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->fg[i].red, style->fg[i].green, style->fg[i].blue);
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      if (!gdk_color_alloc (colormap, &style->bg[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->bg[i].red, style->bg[i].green, style->bg[i].blue);
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      if (!gdk_color_alloc (colormap, &style->light[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->light[i].red, style->light[i].green, style->light[i].blue);
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      if (!gdk_color_alloc (colormap, &style->dark[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->dark[i].red, style->dark[i].green, style->dark[i].blue);
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      if (!gdk_color_alloc (colormap, &style->mid[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->mid[i].red, style->mid[i].green, style->mid[i].blue);
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      if (!gdk_color_alloc (colormap, &style->text[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->text[i].red, style->text[i].green, style->text[i].blue);
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      if (!gdk_color_alloc (colormap, &style->base[i]))
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        g_warning ("unable to allocate color: ( %d %d %d )",
                   style->base[i].red, style->base[i].green, style->base[i].blue);
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      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);
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      gc_values.foreground = style->base[i];
      style->base_gc[i] = gtk_gc_get (style->depth, style->colormap, &gc_values, gc_values_mask);
    }
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  if (style->engine)
    style->engine->realize_style (style);
}

static void
gtk_style_destroy (GtkStyle *style)
{
  g_return_if_fail (style->attach_count == 0);
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  if (style->styles)
    {
      if (style->styles->data != style)
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        g_slist_remove (style->styles, style);
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      else
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        {
          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);
        }
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    }
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  if (style->engine)
    {
      style->engine->destroy_style (style);
      gtk_theme_engine_unref (style->engine);
    }
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  gdk_font_unref (style->font);
  if (style->rc_style)
    gtk_rc_style_unref (style->rc_style);
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  g_free (style);
}

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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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_hline != NULL);
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  style->klass->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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_vline != NULL);
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  style->klass->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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_shadow != NULL);
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  style->klass->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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
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  g_return_if_fail (style->klass->draw_polygon != NULL);
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  style->klass->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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_arrow != NULL);
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  style->klass->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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_diamond != NULL);
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  style->klass->draw_diamond (style, window, state_type, shadow_type, NULL, NULL, NULL, x, y, width, height);
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}


void
gtk_draw_oval (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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_oval != NULL);
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  style->klass->draw_oval (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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{
  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
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  g_return_if_fail (style->klass->draw_string != NULL);
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_box != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_flat_box != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_check != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_option != NULL);
  
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  style->klass->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_cross (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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_cross != NULL);
  
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  style->klass->draw_cross (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_ramp (GtkStyle      *style,
	       GdkWindow     *window,
	       GtkStateType   state_type,
	       GtkShadowType  shadow_type,
	       GtkArrowType   arrow_type,
	       gint           x,
	       gint           y,
	       gint           width,
	       gint           height)
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{
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  g_return_if_fail (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_ramp != NULL);
  
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  style->klass->draw_ramp (style, window, state_type, shadow_type, NULL, NULL, NULL, arrow_type, 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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_tab != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_shadow_gap != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_box_gap != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_extension != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_focus != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_slider != NULL);
  
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  style->klass->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 (style != NULL);
  g_return_if_fail (style->klass != NULL);
  g_return_if_fail (style->klass->draw_handle != NULL);
  
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  style->klass->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
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gtk_style_set_background (GtkStyle    *style,
                          GdkWindow   *window,
                          GtkStateType state_type)
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{
  GdkPixmap *pixmap;
  gint parent_relative;
  
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  g_return_if_fail (style != NULL);
  g_return_if_fail (window != NULL);
  
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  if (style->engine && style->engine->set_background)
    {
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      style->engine->set_background (style, window, state_type);
      
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      return;
    }
  
  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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/* Default functions */
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_window_get_type (window) == GDK_WINDOW_PIXMAP ||
      (!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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}

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;
  
  g_return_if_fail (style != NULL);
  g_return_if_fail (window != NULL);
  
  thickness_light = style->klass->ythickness / 2;
  thickness_dark = style->klass->ythickness - thickness_light;
  
  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;
  
  g_return_if_fail (style != NULL);
  g_return_if_fail (window != NULL);
  
  thickness_light = style->klass->xthickness / 2;
  thickness_dark = style->klass->xthickness - thickness_light;
  
  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;
  for (i = 0; i < thickness_light; i++)
    {
      gdk_draw_line (window, style->dark_gc[state_type], x + i, y1, x + i, y1 + thickness_light - i);
      gdk_draw_line (window, style->light_gc[state_type], x + i, y1 + thickness_light - i, x + i, y2);
    }
  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_shadow (GtkStyle      *style,
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                         GdkWindow     *window,
                         GtkStateType   state_type,
                         GtkShadowType  shadow_type,
                         GdkRectangle  *area,
                         GtkWidget     *widget,
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                         const gchar   *detail,
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                         gint           x,
                         gint           y,
                         gint           width,
                         gint           height)
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{
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  GdkGC *gc1 = NULL;
  GdkGC *gc2 = NULL;
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  gint thickness_light;
  gint thickness_dark;
  gint i;
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  g_return_if_fail (style != NULL);
  g_return_if_fail (window != NULL);
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  if ((width == -1) && (height == -1))
    gdk_window_get_size (window, &width, &height);
  else if (width == -1)
    gdk_window_get_size (window, &width, NULL);
  else if (height == -1)
    gdk_window_get_size (window, NULL, &height);
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  switch (shadow_type)
    {
    case GTK_SHADOW_NONE:
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      return;
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    case GTK_SHADOW_IN:
    case GTK_SHADOW_ETCHED_IN:
      gc1 = style->light_gc[state_type];
      gc2 = style->dark_gc[state_type];
      break;
    case GTK_SHADOW_OUT:
    case GTK_SHADOW_ETCHED_OUT:
      gc1 = style->dark_gc[state_type];
      gc2 = style->light_gc[state_type];
      break;
    }
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  if (area)
    {
      gdk_gc_set_clip_rectangle (gc1, area);
      gdk_gc_set_clip_rectangle (gc2, area);
      if (shadow_type == GTK_SHADOW_IN || 
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          shadow_type == GTK_SHADOW_OUT)
        {
          gdk_gc_set_clip_rectangle (style->black_gc, area);
          gdk_gc_set_clip_rectangle (style->bg_gc[state_type], area);
        }
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    }
  
  switch (shadow_type)
    {
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    case GTK_SHADOW_NONE:
      break;
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    case GTK_SHADOW_IN:
      gdk_draw_line (window, gc1,
                     x, y + height - 1, x + width - 1, y + height - 1);
      gdk_draw_line (window, gc1,
                     x + width - 1, y, x + width - 1, y + height - 1);
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      gdk_draw_line (window, style->bg_gc[state_type],
                     x + 1, y + height - 2, x + width - 2, y + height - 2);
      gdk_draw_line (window, style->bg_gc[state_type],
                     x + width - 2, y + 1, x + width - 2, y + height - 2);
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      gdk_draw_line (window, style->black_gc,
                     x + 1, y + 1, x + width - 2, y + 1);
      gdk_draw_line (window, style->black_gc,
                     x + 1, y + 1, x + 1, y + height - 2);
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      gdk_draw_line (window, gc2,
                     x, y, x + width - 1, y);
      gdk_draw_line (window, gc2,
                     x, y, x, y + height - 1);
      break;
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    case GTK_SHADOW_OUT:
      gdk_draw_line (window, gc1,
                     x + 1, y + height - 2, x + width - 2, y + height - 2);
      gdk_draw_line (window, gc1,
                     x + width - 2, y + 1, x + width - 2, y + height - 2);
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