dw_style.c

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/*
 * File: dw_style.c
 *
 * Copyright (C) 2001-2003 Sebastian Geerken <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "dw_style.h"
#include "dw_widget.h"

#include <gdk/gdk.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>

/*#define DEBUG_LEVEL 1*/
#include "debug.h"

#define EQUIV(a, b) (((a) && (b)) || (!(a) && !(b)))

#define Dw_style_font_ref(font)   ((font)->ref_count++)
#define Dw_style_font_unref(font) if (--((font)->ref_count) == 0) \
                                     Dw_style_font_remove (font)

#define Dw_style_color_ref(color)   ((color)->ref_count++)
#define Dw_style_color_unref(color) if (--((color)->ref_count) == 0) \
                                       Dw_style_color_remove (color)

#define Dw_style_shaded_color_ref(color)   ((color)->ref_count++)
#define Dw_style_shaded_color_unref(color) if (--((color)->ref_count) == 0) \
                                              Dw_style_shaded_color_remove \
                                                 (color) \

static GHashTable *fonts_table;
static GHashTable *colors_table;
static GHashTable *shaded_colors_table;

static gint styles_num = 0;

/* Used by a_Dw_style_numtostr(). */
static const char
   *roman_I0[] ={"I","II","III","IV","V","VI","VII","VIII","IX"},
   *roman_I1[] ={"X","XX","XXX","XL","L","LX","LXX","LXXX","XC"},
   *roman_I2[] ={"C","CC","CCC","CD","D","DC","DCC","DCCC","CM"},
   *roman_I3[] ={"M","MM","MMM","MMMM"};


static gint Dw_style_font_equal (gconstpointer v1, gconstpointer v2);
static guint Dw_style_font_hash (gconstpointer key);
static void Dw_style_font_remove (DwStyleFont *font);

static void Dw_style_color_remove (DwStyleColor *color);
static void Dw_style_shaded_color_remove (DwStyleShadedColor *color);


/* ----------------------------------------------------------------------
 *
 *    Initialization / Cleaning up
 *
 * ----------------------------------------------------------------------
 */

/*
 * Initialize the DwStyle submodule.
 */
void a_Dw_style_init (void)
{
   fonts_table = g_hash_table_new (Dw_style_font_hash, Dw_style_font_equal);
   colors_table = g_hash_table_new (g_direct_hash, g_direct_equal);
   shaded_colors_table = g_hash_table_new (g_direct_hash, g_direct_equal);
}


/*
 * Called by a_Dw_style_freeall.
 */
static void Dw_style_count_fonts (gpointer key,
                                  gpointer value,
                                  gpointer user_data)
{
   DwStyleFont *font = (DwStyleFont*) key;
   gint *count = (int*)user_data;

   count[0]++;
   count[1] += font->ref_count;
}

/*
 * Called by a_Dw_style_freeall.
 */
static void Dw_style_count_colors (gpointer key,
                                   gpointer value,
                                   gpointer user_data)
{
   DwStyleColor *color = (DwStyleColor*) value;
   gint *count = (int*)user_data;

   count[0]++;
   count[1] += color->ref_count;
}

/*
 * Called by a_Dw_style_freeall.
 */
static void Dw_style_count_shaded_colors (gpointer key,
                                          gpointer value,
                                          gpointer user_data)
{
   DwStyleShadedColor *color = (DwStyleShadedColor*) value;
   gint *count = (int*)user_data;

   count[0]++;
   count[1] += color->ref_count;
}


/*
 * Free variables used by DwStyle, and do a check whether memory
 * management works properly.
 */
void a_Dw_style_freeall (void)
{
   gint count[2];

   if (styles_num)
      g_warning ("%d styles left", styles_num);

   count[0] = count[1] = 0;
   g_hash_table_foreach (fonts_table, Dw_style_count_fonts, count);
   if (count[0] || count[1])
      g_warning ("%d fonts (%d references) left", count[0], count[1]);

   count[0] = count[1] = 0;
   g_hash_table_foreach (colors_table, Dw_style_count_colors, count);
   if (count[0] || count[1])
      g_warning ("%d colors (%d references) left", count[0], count[1]);

   count[0] = count[1] = 0;
   g_hash_table_foreach (shaded_colors_table, Dw_style_count_shaded_colors,
                         count);
   if (count[0] || count[1])
      g_warning ("%d shaded colors (%d references) left", count[0], count[1]);

   g_hash_table_destroy (fonts_table);
   g_hash_table_destroy (colors_table);
}


/* ----------------------------------------------------------------------
 *
 *    Styles
 *
 * ----------------------------------------------------------------------
 */


/*
 * Set all style fields except font and color to reasonable defaults.
 */
void a_Dw_style_init_values (DwStyle *style_attrs,
                             GdkWindow *window)
{
   style_attrs->x_link = -1;
   style_attrs->x_tooltip = NULL;
   style_attrs->text_decoration = 0;
   style_attrs->text_align = DW_STYLE_TEXT_ALIGN_LEFT;
   style_attrs->list_style_type = DW_STYLE_LIST_STYLE_TYPE_DISC;
   style_attrs->valign = DW_STYLE_VALIGN_MIDDLE;
   style_attrs->background_color = NULL;
   style_attrs->width = DW_STYLE_LENGTH_AUTO;
   style_attrs->height = DW_STYLE_LENGTH_AUTO;

   a_Dw_style_box_set_val (&style_attrs->margin, 0);
   a_Dw_style_box_set_val (&style_attrs->border_width, 0);
   a_Dw_style_box_set_val (&style_attrs->padding, 0);
   a_Dw_style_box_set_border_color (style_attrs, NULL);
   a_Dw_style_box_set_border_style (style_attrs, DW_STYLE_BORDER_NONE);
   style_attrs->border_spacing = 0;

   style_attrs->display = DW_STYLE_DISPLAY_INLINE;
   style_attrs->white_space = DW_STYLE_WHITE_SPACE_NORMAL;
}


/*
 * Reset those style attributes to their standard values, which are
 * not inherited, according to CSS.
 */
void a_Dw_style_reset_values (DwStyle *style_attrs,
                              GdkWindow *window)
{
   style_attrs->x_link = -1;
   style_attrs->background_color = NULL;
   style_attrs->x_tooltip = NULL;

   style_attrs->text_align = DW_STYLE_TEXT_ALIGN_LEFT; /* ??? */
   style_attrs->valign = DW_STYLE_VALIGN_MIDDLE;
   style_attrs->text_align_char = '.';
   style_attrs->background_color = NULL;
   style_attrs->width = DW_STYLE_LENGTH_AUTO;
   style_attrs->height = DW_STYLE_LENGTH_AUTO;

   a_Dw_style_box_set_val (&style_attrs->margin, 0);
   a_Dw_style_box_set_val (&style_attrs->border_width, 0);
   a_Dw_style_box_set_val (&style_attrs->padding, 0);
   a_Dw_style_box_set_border_color (style_attrs, NULL);
   a_Dw_style_box_set_border_style (style_attrs, DW_STYLE_BORDER_NONE);
   style_attrs->border_spacing = 0;

   style_attrs->display = DW_STYLE_DISPLAY_INLINE;
   style_attrs->white_space = DW_STYLE_WHITE_SPACE_NORMAL;
}

/*
 * Return a new DwStyle, with increased reference pointer.
 */
DwStyle* a_Dw_style_new (DwStyle *style_attrs,
                         GdkWindow *window)
{
   DwStyle *style;

   style = g_new (DwStyle, 1);
   *style = *style_attrs;
   style->ref_count = 1;
   Dw_style_font_ref (style->font);
   Dw_style_color_ref (style->color);
   if (style->background_color)
      Dw_style_color_ref (style->background_color);
   if (style->border_color.top)
      Dw_style_shaded_color_ref (style->border_color.top);
   if (style->border_color.right)
      Dw_style_shaded_color_ref (style->border_color.right);
   if (style->border_color.bottom)
      Dw_style_shaded_color_ref (style->border_color.bottom);
   if (style->border_color.left)
      Dw_style_shaded_color_ref (style->border_color.left);
   if (style->x_tooltip)
      a_Dw_tooltip_ref (style->x_tooltip);

   styles_num++;
   return style;
}

/*
 * Remove a style (called when ref_count == 0).
 */
void Dw_style_remove (DwStyle *style)
{
   Dw_style_font_unref (style->font);
   Dw_style_color_unref (style->color);
   if (style->background_color)
      Dw_style_color_unref (style->background_color);
   if (style->border_color.top)
      Dw_style_shaded_color_unref (style->border_color.top);
   if (style->border_color.right)
      Dw_style_shaded_color_unref (style->border_color.right);
   if (style->border_color.bottom)
      Dw_style_shaded_color_unref (style->border_color.bottom);
   if (style->border_color.left)
      Dw_style_shaded_color_unref (style->border_color.left);
   if (style->x_tooltip)
      a_Dw_tooltip_unref (style->x_tooltip);

   g_free (style);
   styles_num--;
}



/* ----------------------------------------------------------------------
 *
 *    Fonts
 *
 * ----------------------------------------------------------------------
 */

/*
 * Create the GdkFont. font->name contains one name. If try_all is
 * TRUE, try also standard fonts, if anything else fails.
 */
static void Dw_style_font_realize (DwStyleFont *font, gboolean try_all)
{
   char fontname[256], *style_char_1 = NULL, *style_char_2 = NULL;

   switch (font->style) {
   case DW_STYLE_FONT_STYLE_NORMAL:
      style_char_1 = style_char_2 = "r";
      break;
   case DW_STYLE_FONT_STYLE_ITALIC:
      style_char_1 = "i";
      style_char_2 = "o";
      break;
   case DW_STYLE_FONT_STYLE_OBLIQUE:
      style_char_1 = "o";
      style_char_2 = "i";
      break;
   }

   sprintf (fontname, "-*-%s-%s-%s-*-*-%d-*-75-75-*-*-iso8859-1",
            font->name,
            (font->weight >= 500) ? "bold" : "medium",
            style_char_1, font->size);
   font->font = gdk_font_load (fontname);

   if (font->font == NULL && font->style != DW_STYLE_FONT_STYLE_NORMAL) {
      sprintf (fontname, "-*-%s-%s-%s-*-*-%d-*-75-75-*-*-iso8859-1",
               font->name,
               (font->weight >= 500) ? "bold" : "medium",
               style_char_2, font->size);
      font->font = gdk_font_load (fontname);
   }

   if (try_all) {
      if (font->font == NULL) {
         /* Can't load the font - substitute the default instead. */
         font->font =
            gdk_font_load
            ("-adobe-helvetica-medium-r-normal--*-100-*-*-*-*-iso8859-1");
      }

      if (font->font == NULL) {
         /* Try another platform-font that should be available. (iPaq) */
         font->font =
            gdk_font_load
            ("-misc-fixed-medium-r-normal--13-120-75-75-c-80-iso8859-1");
      }

      if (font->font == NULL) {
         /* Can't load any suitable font!  */
         g_warning ("Can't load any ISO8859-1 font!?! :(");
         font->font =
            gdk_font_load ("-adobe-helvetica-*-*-*--*-*-*-*-*-*-*-*");
      }
   }

   if (font->font) {
      font->space_width = gdk_char_width (font->font, ' ');
      font->x_height = gdk_char_height (font->font, 'x');
   }
}


/*
 * Used for the font_table hash table.
 */
static gint Dw_style_font_equal (gconstpointer v1, gconstpointer v2)
{
   const DwStyleFont *font1 = (DwStyleFont*) v1, *font2 = (DwStyleFont*) v2;

   return (font1->size == font2->size &&
           font1->weight == font2->weight &&
           font1->style == font2->style &&
           strcmp (font1->name, font2->name) == 0);
}


/*
 * Used for the font_table hash table.
 */
static guint Dw_style_font_hash (gconstpointer key)
{
   const DwStyleFont *font = (DwStyleFont*) key;
   guint h;

   h = g_str_hash (font->name);
   h = (h << 5) - h + font->size;
   h = (h << 5) - h + font->weight;
   h = (h << 5) - h + font->style;
   return h;
}


/*
 * Returns a new or already existing font. This function is only used
 * internally, and called by a_Dw_style_font_new and
 * a_Dw_style_font_new_from_list.
 *
 * Note that the reference counter is not increased/set to zero, it
 * will be increased by a_Dw_style_new. If 'try_all' is TRUE, try also
 * standard fonts, if anything else fails.
 */
static DwStyleFont* Dw_style_font_new_internal (DwStyleFont *font_attrs,
                                                gboolean try_all)
{
   DwStyleFont *font;

   g_return_val_if_fail (font_attrs->name != NULL, NULL);

   if ((font = g_hash_table_lookup (fonts_table, font_attrs))) {
      return font;
   } else {
      font = g_new (DwStyleFont, 1);
      font->size = font_attrs->size;
      font->weight = font_attrs->weight;
      font->style = font_attrs->style;
      font->name = g_strdup (font_attrs->name);
      font->ref_count = 0;

      Dw_style_font_realize (font, try_all);
      if (font->font) {
         g_hash_table_insert (fonts_table, font, font);
         return font;
      } else {
         g_free (font->name);
         g_free (font);
         return NULL;
      }
   }
}


/*
 * Return a new or already existing font, with one name in
 * font_attrs->name. See also Dw_style_font_new_internal.
 */
DwStyleFont* a_Dw_style_font_new (DwStyleFont *font_attrs)
{
   DwStyleFont *font;

   font = Dw_style_font_new_internal (font_attrs, TRUE);
   if (font == NULL)
      g_error ("Could not find any font.");

   return font;
}


/*
 * Return a new or already existing font, with font_attrs->name
 * containing a comma separated list of names. See also
 * Dw_style_font_new_internal.
 */
DwStyleFont* a_Dw_style_font_new_from_list (DwStyleFont *font_attrs,
                                            gchar *default_family)
{
   DwStyleFont *font = NULL, font_attrs2;
   char *comma, *list, *current;

   font_attrs2 = *font_attrs;
   current = list = g_strdup (font_attrs->name);

   while (current && (font == NULL)) {
      comma = strchr (current, ',');
      if (comma) *comma = 0;

      font_attrs2.name = current;
      font = Dw_style_font_new_internal (&font_attrs2, FALSE);
      if (font)
         break;

      if (comma) {
         current = comma + 1;
         while (isspace (*current)) current++;
      } else
         current = NULL;
   }

   g_free (list);

   if (font == NULL) {
      font_attrs2.name = default_family;
      font = Dw_style_font_new_internal (&font_attrs2, TRUE);
   }

   if (font == NULL)
      g_error ("Could not find any font.");

   return font;
}


/*
 * Remove a font (called when ref_count == 0).
 */
static void Dw_style_font_remove (DwStyleFont *font)
{
   g_hash_table_remove (fonts_table, font);
   g_free (font->name);
   gdk_font_unref (font->font);
   g_free (font);
}


/* ----------------------------------------------------------------------
 *
 *    Colors
 *
 * ----------------------------------------------------------------------
 */

/*
 * Copied from gtkstyle.c.
 * Convert RGB into HLS.
 */
static void Dw_style_rgb_to_hls (gdouble *r,
                                 gdouble *g,
                                 gdouble *b)
{
   gdouble min;
   gdouble max;
   gdouble red;
   gdouble green;
   gdouble blue;
   gdouble h, l, s;
   gdouble delta;

   red = *r;
   green = *g;
   blue = *b;

   if (red > green) {
      if (red > blue)
         max = red;
      else
         max = blue;

      if (green < blue)