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svg-color.cpp

#define __SP_SVG_COLOR_C__

/*
 * SVG data parser
 *
 * Authors:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *
 * Copyright (C) 1999-2002 Lauris Kaplinski
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */

#include "config.h"

#include <math.h>

#if HAVE_STRING_H
#include <string.h>
#endif

#if HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include <ctype.h>
#include <glib.h>
#include "svg.h"

struct SPSVGColor {
      unsigned long rgb;
      char const *name;
};

/*
 * Use default if color not found
 */
#define SP_SVG_COLOR(P,D) ((P)?((*((guint32*)(P)))):(D))

/*
 * These are the colors defined in the SVG standard
 */
static SPSVGColor sp_svg_color_named[] = {
      { 0xF0F8FF, "aliceblue" },
      { 0xFAEBD7, "antiquewhite" },
      { 0x00FFFF, "aqua" },
      { 0x7FFFD4, "aquamarine" },
      { 0xF0FFFF, "azure" },
      { 0xF5F5DC, "beige" },
      { 0xFFE4C4, "bisque" },
      { 0x000000, "black" },
      { 0xFFEBCD, "blanchedalmond" },
      { 0x0000FF, "blue" },
      { 0x8A2BE2, "blueviolet" },
      { 0xA52A2A, "brown" },
      { 0xDEB887, "burlywood" },
      { 0x5F9EA0, "cadetblue" },
      { 0x7FFF00, "chartreuse" },
      { 0xD2691E, "chocolate" },
      { 0xFF7F50, "coral" },
      { 0x6495ED, "cornflowerblue" },
      { 0xFFF8DC, "cornsilk" },
      { 0xDC143C, "crimson" },
      { 0x00FFFF, "cyan" },
      { 0x00008B, "darkblue" },
      { 0x008B8B, "darkcyan" },
      { 0xB8860B, "darkgoldenrod" },
      { 0xA9A9A9, "darkgray" },
      { 0x006400, "darkgreen" },
      { 0xA9A9A9, "darkgrey" },
      { 0xBDB76B, "darkkhaki" },
      { 0x8B008B, "darkmagenta" },
      { 0x556B2F, "darkolivegreen" },
      { 0xFF8C00, "darkorange" },
      { 0x9932CC, "darkorchid" },
      { 0x8B0000, "darkred" },
      { 0xE9967A, "darksalmon" },
      { 0x8FBC8F, "darkseagreen" },
      { 0x483D8B, "darkslateblue" },
      { 0x2F4F4F, "darkslategray" },
      { 0x2F4F4F, "darkslategrey" },
      { 0x00CED1, "darkturquoise" },
      { 0x9400D3, "darkviolet" },
      { 0xFF1493, "deeppink" },
      { 0x00BFFF, "deepskyblue" },
      { 0x696969, "dimgray" },
      { 0x696969, "dimgrey" },
      { 0x1E90FF, "dodgerblue" },
      { 0xB22222, "firebrick" },
      { 0xFFFAF0, "floralwhite" },
      { 0x228B22, "forestgreen" },
      { 0xFF00FF, "fuchsia" },
      { 0xDCDCDC, "gainsboro" },
      { 0xF8F8FF, "ghostwhite" },
      { 0xFFD700, "gold" },
      { 0xDAA520, "goldenrod" },
      { 0x808080, "gray" },
      { 0x808080, "grey" },
      { 0x008000, "green" },
      { 0xADFF2F, "greenyellow" },
      { 0xF0FFF0, "honeydew" },
      { 0xFF69B4, "hotpink" },
      { 0xCD5C5C, "indianred" },
      { 0x4B0082, "indigo" },
      { 0xFFFFF0, "ivory" },
      { 0xF0E68C, "khaki" },
      { 0xE6E6FA, "lavender" },
      { 0xFFF0F5, "lavenderblush" },
      { 0x7CFC00, "lawngreen" },
      { 0xFFFACD, "lemonchiffon" },
      { 0xADD8E6, "lightblue" },
      { 0xF08080, "lightcoral" },
      { 0xE0FFFF, "lightcyan" },
      { 0xFAFAD2, "lightgoldenrodyellow" },
      { 0xD3D3D3, "lightgray" },
      { 0x90EE90, "lightgreen" },
      { 0xD3D3D3, "lightgrey" },
      { 0xFFB6C1, "lightpink" },
      { 0xFFA07A, "lightsalmon" },
      { 0x20B2AA, "lightseagreen" },
      { 0x87CEFA, "lightskyblue" },
      { 0x778899, "lightslategray" },
      { 0x778899, "lightslategrey" },
      { 0xB0C4DE, "lightsteelblue" },
      { 0xFFFFE0, "lightyellow" },
      { 0x00FF00, "lime" },
      { 0x32CD32, "limegreen" },
      { 0xFAF0E6, "linen" },
      { 0xFF00FF, "magenta" },
      { 0x800000, "maroon" },
      { 0x66CDAA, "mediumaquamarine" },
      { 0x0000CD, "mediumblue" },
      { 0xBA55D3, "mediumorchid" },
      { 0x9370DB, "mediumpurple" },
      { 0x3CB371, "mediumseagreen" },
      { 0x7B68EE, "mediumslateblue" },
      { 0x00FA9A, "mediumspringgreen" },
      { 0x48D1CC, "mediumturquoise" },
      { 0xC71585, "mediumvioletred" },
      { 0x191970, "midnightblue" },
      { 0xF5FFFA, "mintcream" },
      { 0xFFE4E1, "mistyrose" },
      { 0xFFE4B5, "moccasin" },
      { 0xFFDEAD, "navajowhite" },
      { 0x000080, "navy" },
      { 0xFDF5E6, "oldlace" },
      { 0x808000, "olive" },
      { 0x6B8E23, "olivedrab" },
      { 0xFFA500, "orange" },
      { 0xFF4500, "orangered" },
      { 0xDA70D6, "orchid" },
      { 0xEEE8AA, "palegoldenrod" },
      { 0x98FB98, "palegreen" },
      { 0xAFEEEE, "paleturquoise" },
      { 0xDB7093, "palevioletred" },
      { 0xFFEFD5, "papayawhip" },
      { 0xFFDAB9, "peachpuff" },
      { 0xCD853F, "peru" },
      { 0xFFC0CB, "pink" },
      { 0xDDA0DD, "plum" },
      { 0xB0E0E6, "powderblue" },
      { 0x800080, "purple" },
      { 0xFF0000, "red" },
      { 0xBC8F8F, "rosybrown" },
      { 0x4169E1, "royalblue" },
      { 0x8B4513, "saddlebrown" },
      { 0xFA8072, "salmon" },
      { 0xF4A460, "sandybrown" },
      { 0x2E8B57, "seagreen" },
      { 0xFFF5EE, "seashell" },
      { 0xA0522D, "sienna" },
      { 0xC0C0C0, "silver" },
      { 0x87CEEB, "skyblue" },
      { 0x6A5ACD, "slateblue" },
      { 0x708090, "slategray" },
      { 0x708090, "slategrey" },
      { 0xFFFAFA, "snow" },
      { 0x00FF7F, "springgreen" },
      { 0x4682B4, "steelblue" },
      { 0xD2B48C, "tan" },
      { 0x008080, "teal" },
      { 0xD8BFD8, "thistle" },
      { 0xFF6347, "tomato" },
      { 0x40E0D0, "turquoise" },
      { 0xEE82EE, "violet" },
      { 0xF5DEB3, "wheat" },
      { 0xFFFFFF, "white" },
      { 0xF5F5F5, "whitesmoke" },
      { 0xFFFF00, "yellow" },
      { 0x9ACD32, "yellowgreen" }
};

#define SP_SVG_NUMCOLORS (sizeof (sp_svg_color_named) / sizeof (sp_svg_color_named[0]))

static GHashTable *sp_svg_create_color_hash (void);

guint32
sp_svg_read_color (const gchar *str, guint32 def)
{
      static GHashTable *colors = NULL;
      gchar c[32];
      guint32 val = 0;

      /* 
       * todo: handle the rgb (r, g, b) and rgb ( r%, g%, b%), syntax 
       * defined in http://www.w3.org/TR/REC-CSS2/syndata.html#color-units 
       */

      if (str == NULL) return def;
      while ((*str <= ' ') && *str) str++;
      if (!*str) return def;

      if (str[0] == '#') {
            gint i;
            for (i = 1; str[i]; i++) {
                  int hexval;
                  if (str[i] >= '0' && str[i] <= '9')
                        hexval = str[i] - '0';
                  else if (str[i] >= 'A' && str[i] <= 'F')
                        hexval = str[i] - 'A' + 10;
                  else if (str[i] >= 'a' && str[i] <= 'f')
                        hexval = str[i] - 'a' + 10;
                  else
                        break;
                  val = (val << 4) + hexval;
            }
            /* handle #rgb case */
            if (i == 4) {
                  val = ((val & 0xf00) << 8) |
                        ((val & 0x0f0) << 4) |
                        (val & 0x00f);
                  val |= val << 4;
            }
      } else if (!strncmp (str, "rgb(", 4)) {
            gboolean hasp, hasd;
            gchar *s, *e;
            gdouble r, g, b;

            s = (gchar *) str + 4;
            hasp = FALSE;
            hasd = FALSE;

            r = g_ascii_strtod (s, &e);
            if (s == e) return def;
            s = e;
            if (*s == '%') {
                  hasp = TRUE;
                  s += 1;
            } else {
                  hasd = TRUE;
            }
            while (*s && g_ascii_isspace (*s)) s += 1;
            if (*s != ',') return def;
            s += 1;
            while (*s && g_ascii_isspace (*s)) s += 1;
            g = g_ascii_strtod (s, &e);
            if (s == e) return def;
            s = e;
            if (*s == '%') {
                  hasp = TRUE;
                  s += 1;
            } else {
                  hasd = TRUE;
            }
            while (*s && g_ascii_isspace (*s)) s += 1;
            if (*s != ',') return def;
            s += 1;
            while (*s && g_ascii_isspace (*s)) s += 1;
            b = g_ascii_strtod (s, &e);
            if (s == e) return def;
            s = e;
            if (*s == '%') {
                  hasp = TRUE;
            } else {
                  hasd = TRUE;
            }
            if (hasp && hasd) return def;
            if (hasp) {
                  val = (guint) floor (CLAMP (r, 0.0, 100.0) * 2.559999) << 24;
                  val |= ((guint) floor (CLAMP (g, 0.0, 100.0) * 2.559999) << 16);
                  val |= ((guint) floor (CLAMP (b, 0.0, 100.0) * 2.559999) << 8);
            } else {
                  val = (guint) CLAMP (r, 0, 255) << 24;
                  val |= ((guint) CLAMP (g, 0, 255) << 16);
                  val |= ((guint) CLAMP (b, 0, 255) << 8);
            }
            return val;
      } else {
            gint i;
            if (!colors) {
                  colors = sp_svg_create_color_hash ();
            }
            for (i = 0; i < 31; i++) {
                  if (str[i] == ';') {
                        c[i] = '\0';
                        break;
                  }
                  c[i] = g_ascii_tolower (str[i]);
                  if (!str[i]) break;
            }
            c[31] = '\0';
            /* this will default to black on a failed lookup */
            val = SP_SVG_COLOR (g_hash_table_lookup (colors, c), def);
      }

      return (val << 8);
}

gint
sp_svg_write_color (gchar * buf, gint buflen, guint32 color)
{
      return g_snprintf (buf, buflen, "#%06x", color >> 8);
}

static GHashTable *
sp_svg_create_color_hash (void)
{
      GHashTable * colors = g_hash_table_new (g_str_hash, g_str_equal);

      for (unsigned i = 0 ; i < SP_SVG_NUMCOLORS ; i++) {
            void const *name = sp_svg_color_named[i].name;
            gpointer val = &(sp_svg_color_named[i].rgb);
            g_hash_table_insert(colors, const_cast<gpointer>(name), val);
      }

      return colors;
}

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