libchimara/style.c

   1 #include "style.h"
   2 #include <stdio.h>
   3 #include <fcntl.h>
   4
   5 extern GPrivate *glk_data_key;
   6
   7 static gboolean style_accept(GScanner *scanner, GTokenType token);
   8 static gboolean style_accept_style_selector(GScanner *scanner);
   9 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  10 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  11 static void style_table_copy(gpointer key, gpointer tag, gpointer target_table);
  12 static GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  13
  14 /**
  15  * glk_set_style:
  16  * @styl: The style to apply
  17  *
  18  * Changes the style of the current output stream. @styl should be one of the
  19  * <code>style_</code> constants listed above. However, any value is actually
  20  * legal; if the interpreter does not recognize the style value, it will treat
  21  * it as %style_Normal.
  22  * <note><para>
  23  *  This policy allows for the future definition of styles without breaking old
  24  *  Glk libraries.
  25  * </para></note>
  26  */
  27 void
  28 glk_set_style(glui32 styl)
  29 {
  30         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  31         g_return_if_fail(glk_data->current_stream != NULL);
  32         glk_set_style_stream(glk_data->current_stream, styl);
  33 }
  34
  35 static const gchar* TAG_NAMES[] = {
  36         "normal",
  37         "emphasized",
  38         "preformatted",
  39         "header",
  40         "subheader",
  41         "alert",
  42         "note",
  43         "block-quote",
  44         "input",
  45         "user1",
  46         "user2"
  47 };
  48
  49 /* Internal function: mapping from style enum to tag name */
  50 static gchar*
  51 get_tag_name(glui32 style)
  52 {
  53         if(style >= style_NUMSTYLES) {
  54                 WARNING("Unsupported style");
  55                 return "normal";
  56         } else {
  57                 return (gchar*) TAG_NAMES[style];
  58         }
  59 }
  60
  61 /**
  62  * glk_set_style_stream:
  63  * @str: Output stream to change the style of
  64  * @styl: The style to apply
  65  *
  66  * This changes the style of the stream @str. See glk_set_style().
  67  */
  68 void
  69 glk_set_style_stream(strid_t str, glui32 styl) {
  70         str->style = get_tag_name(styl);
  71 }
  72
  73 /* Internal function: call this to initialize the default styles to a textbuffer. */
  74 void
  75 style_init_textbuffer(GtkTextBuffer *buffer)
  76 {
  77         g_return_if_fail(buffer != NULL);
  78
  79         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  80         if( G_UNLIKELY(!glk_data->style_initialized) ) {
  81                 style_init();
  82         }
  83         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  84 }
  85
  86 /* Internal function: call this to initialize the default styles to a textgrid. */
  87 void
  88 style_init_textgrid(GtkTextBuffer *buffer)
  89 {
  90         g_return_if_fail(buffer != NULL);
  91
  92         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  93         if( G_UNLIKELY(!glk_data->style_initialized) ) {
  94                 style_init();
  95         }
  96         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  97 }
  98
  99 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 100 static void
 101 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 102 {
 103         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 104 }
 105
 106 /* Internal function used to iterate over a style table, copying it */
 107 static void
 108 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 109 {
 110         g_return_if_fail(key != NULL);
 111         g_return_if_fail(tag != NULL);
 112         g_return_if_fail(target_table != NULL);
 113
 114         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 115 }
 116
 117 /* Internal function that copies a text tag */
 118 static GtkTextTag*
 119 gtk_text_tag_copy(GtkTextTag *tag)
 120 {
 121         GtkTextTag *copy;
 122
 123         g_return_val_if_fail(tag != NULL, NULL);
 124
 125         copy = gtk_text_tag_new(tag->name);
 126         gtk_text_attributes_copy_values(tag->values, copy->values);
 127
 128         #define _COPY_FLAG(flag) copy->flag = tag->flag
 129                 _COPY_FLAG (bg_color_set);
 130                 _COPY_FLAG (bg_color_set);
 131                 _COPY_FLAG (bg_stipple_set);
 132                 _COPY_FLAG (fg_color_set);
 133                 _COPY_FLAG (fg_stipple_set);
 134                 _COPY_FLAG (justification_set);
 135                 _COPY_FLAG (left_margin_set);
 136                 _COPY_FLAG (indent_set);
 137                 _COPY_FLAG (rise_set);
 138                 _COPY_FLAG (strikethrough_set);
 139                 _COPY_FLAG (right_margin_set);
 140                 _COPY_FLAG (pixels_above_lines_set);
 141                 _COPY_FLAG (pixels_below_lines_set);
 142                 _COPY_FLAG (pixels_inside_wrap_set);
 143                 _COPY_FLAG (tabs_set);
 144                 _COPY_FLAG (underline_set);
 145                 _COPY_FLAG (wrap_mode_set);
 146                 _COPY_FLAG (bg_full_height_set);
 147                 _COPY_FLAG (invisible_set);
 148                 _COPY_FLAG (editable_set);
 149                 _COPY_FLAG (language_set);
 150         #undef _COPY_FLAG
 151
 152         return copy;
 153 }
 154
 155 /* Internal function that reads the default styles from a CSS file */
 156 void
 157 style_init()
 158 {
 159         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 160         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 161         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 162         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 163         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 164         GtkTextTag *tag;
 165
 166         /* Create the CSS file scanner */
 167         GScanner *scanner = g_scanner_new(NULL);
 168
 169         int f = open(glk_data->css_file, O_RDONLY);
 170         g_return_if_fail(f != -1);
 171         g_scanner_input_file(scanner, f);
 172         scanner->input_name = glk_data->css_file;
 173         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 174         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 175         scanner->config->symbol_2_token = TRUE;
 176         scanner->config->cpair_comment_single = NULL;
 177         scanner->config->scan_float = FALSE;
 178
 179         /* Initialise the default styles */
 180         g_hash_table_insert(default_text_grid_styles, "normal", gtk_text_tag_new("normal"));
 181
 182         tag = gtk_text_tag_new("emphasized");
 183         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 184         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 185
 186         tag = gtk_text_tag_new("preformatted");
 187         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 188         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 189
 190         tag = gtk_text_tag_new("header");
 191         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 192         g_hash_table_insert(default_text_grid_styles, "header", tag);
 193
 194         tag = gtk_text_tag_new("subheader");
 195         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 196         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 197
 198         tag = gtk_text_tag_new("alert");
 199         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 200         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 201
 202         tag = gtk_text_tag_new("note");
 203         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 204         g_hash_table_insert(default_text_grid_styles, "note", tag);
 205
 206         tag = gtk_text_tag_new("block-quote");
 207         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, NULL);
 208         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 209
 210         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 211         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 212         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 213
 214         g_hash_table_foreach(default_text_grid_styles, style_table_copy, default_text_buffer_styles);
 215         glk_data->default_styles->text_grid = default_text_grid_styles;
 216         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 217
 218         /* Run the scanner over the CSS file, overriding defaults */
 219         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 220                 if( !style_accept_style_selector(scanner) )
 221                         break;
 222         }
 223
 224         /* Set the current style to a copy of the default style */
 225         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 226         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 227         glk_data->current_styles->text_grid = current_text_grid_styles;
 228         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 229
 230         g_scanner_destroy(scanner);
 231
 232         glk_data->style_initialized = TRUE;
 233 }
 234
 235 /* Internal function: parses a token */
 236 static gboolean
 237 style_accept(GScanner *scanner, GTokenType token)
 238 {
 239         GTokenType next = g_scanner_get_next_token(scanner);
 240         if(next != token ) {
 241                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 242                 return FALSE;
 243         } else {
 244                 return TRUE;
 245         }
 246 }
 247
 248 /* Internal function: parses a style selector */
 249 static gboolean
 250 style_accept_style_selector(GScanner *scanner)
 251 {
 252         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 253
 254         GtkTextTag *current_tag;
 255         gchar *field;
 256         GTokenType token = g_scanner_get_next_token(scanner);
 257         GTokenValue value = g_scanner_cur_value(scanner);
 258
 259         if(
 260                 token != G_TOKEN_IDENTIFIER ||
 261                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 262         ) {
 263                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 264                 return FALSE;
 265         }
 266
 267         field = g_strdup(value.v_identifier);
 268
 269         if( !style_accept(scanner, '.') )
 270                 return FALSE;
 271
 272         token = g_scanner_get_next_token(scanner);
 273         value = g_scanner_cur_value(scanner);
 274
 275         if(token != G_TOKEN_IDENTIFIER) {
 276                 g_scanner_error(scanner, "CSS Error: style selector expected");
 277                 return FALSE;
 278         }
 279
 280         if( !strcmp(field, "buffer") )
 281                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 282         else
 283                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 284
 285         if(current_tag == NULL) {
 286                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 287                 return FALSE;
 288         }
 289
 290         if( !style_accept(scanner, '{') )
 291                 return FALSE;
 292
 293         while( g_scanner_peek_next_token(scanner) != '}') {
 294                 if( !style_accept_style_hint(scanner, current_tag) )
 295                         return FALSE;
 296         }
 297
 298         if( !style_accept(scanner, '}') )
 299                 return FALSE;
 300
 301         return TRUE;
 302 }
 303
 304 /* Internal function: parses a style hint */
 305 static gboolean
 306 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 307 {
 308         GTokenType token = g_scanner_get_next_token(scanner);
 309         GTokenValue value = g_scanner_cur_value(scanner);
 310         gchar *hint;
 311
 312         if(token != G_TOKEN_IDENTIFIER) {
 313                 g_scanner_error(scanner, "CSS Error: style hint expected");
 314                 return FALSE;
 315         }
 316
 317         hint = g_strdup(value.v_identifier);
 318
 319         if( !style_accept(scanner, ':') )
 320                 return FALSE;
 321
 322         token = g_scanner_get_next_token(scanner);
 323         value = g_scanner_cur_value(scanner);
 324
 325         if( !strcmp(hint, "font-family") ) {
 326                 if(token != G_TOKEN_STRING) {
 327                         g_scanner_error(scanner, "CSS Error: string expected");
 328                         return FALSE;
 329                 }
 330                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 331         }
 332         else if( !strcmp(hint, "font-weight") ) {
 333                 if(token != G_TOKEN_IDENTIFIER) {
 334                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 335                         return FALSE;
 336                 }
 337
 338                 if( !strcmp(value.v_identifier, "bold") )
 339                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 340                 else if( !strcmp(value.v_identifier, "normal") )
 341                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 342                 else {
 343                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 344                         return FALSE;
 345                 }
 346         }
 347         else if( !strcmp(hint, "font-style") ) {
 348                 if(token != G_TOKEN_IDENTIFIER) {
 349                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 350                         return FALSE;
 351                 }
 352
 353                 if( !strcmp(value.v_identifier, "italic") )
 354                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 355                 else if( !strcmp(value.v_identifier, "normal") )
 356                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 357                 else {
 358                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 359                         return FALSE;
 360                 }
 361         }
 362         else if( !strcmp(hint, "font-size") ) {
 363                 if(token == G_TOKEN_INT)
 364                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 365                 else if(token == G_TOKEN_FLOAT)
 366                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 367                 else {
 368                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 369                         return FALSE;
 370                 }
 371         }
 372         else if( !strcmp(hint, "color") ) {
 373                 if(token != G_TOKEN_IDENTIFIER) {
 374                         g_scanner_error(scanner, "CSS Error: hex color expected");
 375                         return FALSE;
 376                 }
 377
 378                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 379         }
 380         else if( !strcmp(hint, "background-color") ) {
 381                 if(token != G_TOKEN_IDENTIFIER) {
 382                         g_scanner_error(scanner, "CSS Error: hex color expected");
 383                         return FALSE;
 384                 }
 385                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 386         }
 387         else if( !strcmp(hint, "text-align") ) {
 388                 if(token != G_TOKEN_IDENTIFIER) {
 389                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 390                         return FALSE;
 391                 }
 392
 393                 if( !strcmp(value.v_identifier, "left") )
 394                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 395                 else if( !strcmp(value.v_identifier, "right") )
 396                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 397                 else if( !strcmp(value.v_identifier, "center") )
 398                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 399                 else {
 400                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 401                         return FALSE;
 402                 }
 403         }
 404         else if( !strcmp(hint, "margin-left") ) {
 405                 if(token != G_TOKEN_INT) {
 406                         g_scanner_error(scanner, "CSS Error: integer expected");
 407                         return FALSE;
 408                 }
 409                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 410         }
 411         else if( !strcmp(hint, "margin-right") ) {
 412                 if(token != G_TOKEN_INT) {
 413                         g_scanner_error(scanner, "CSS Error: integer expected");
 414                         return FALSE;
 415                 }
 416                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 417         }
 418         else if( !strcmp(hint, "margin-top") ) {
 419                 if(token != G_TOKEN_INT) {
 420                         g_scanner_error(scanner, "CSS Error: integer expected");
 421                         return FALSE;
 422                 }
 423                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 424         }
 425         else if( !strcmp(hint, "margin-bottom") ) {
 426                 if(token != G_TOKEN_INT) {
 427                         g_scanner_error(scanner, "CSS Error: integer expected");
 428                         return FALSE;
 429                 }
 430                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 431         }
 432
 433         else {
 434                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 435                 return FALSE;
 436         }
 437
 438         if( !style_accept(scanner, ';') )
 439                 return FALSE;
 440
 441         return TRUE;
 442 }
 443
 444 /* Internal function: parses a glk color to a #hex-value */
 445 static void
 446 color_format(glui32 val, gchar *buffer)
 447 {
 448         g_return_if_fail(buffer != NULL);
 449
 450         sprintf(buffer, "#%02X%02X%02X",
 451                 ((val & 0xff0000) >> 16),
 452                 ((val & 0x00ff00) >> 8),
 453                 (val & 0x0000ff)
 454         );
 455 }
 456
 457 /* Internal function: parses a GdkColor to a glk color */
 458 static glui32
 459 color_parse_gdk(GdkColor *color)
 460 {
 461         g_return_val_if_fail(color != NULL, 0);
 462         return (glui32) color->pixel;
 463 }
 464
 465 /* Internal function: changes a GTK tag to correspond with the given style. */
 466 static void
 467 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 468 {
 469         g_return_if_fail(tag != NULL);
 470
 471         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 472         GObject *tag_object = G_OBJECT(tag);
 473         gint reverse_color = 0;
 474
 475         /* FIXME where should we keep track of this?
 476         g_object_get(tag, "reverse_color", &reverse_color, NULL);
 477         */
 478
 479         int i = 0;
 480         gchar color[20];
 481         switch(hint) {
 482         case stylehint_Indentation:
 483                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 484                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 485                 break;
 486
 487         case stylehint_ParaIndentation:
 488                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 489                 break;
 490
 491         case stylehint_Justification:
 492                 switch(val) {
 493                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 494                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 495                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 496                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 497                         default:
 498                                 WARNING("Unknown justification");
 499                                 i = GTK_JUSTIFY_LEFT;
 500                 }
 501                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 502                 break;
 503
 504         case stylehint_Weight:
 505                 switch(val) {
 506                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 507                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 508                         case  1: i = PANGO_WEIGHT_BOLD; break;
 509                         default: WARNING("Unknown font weight");
 510                 }
 511                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 512                 break;
 513
 514         case stylehint_Size:
 515                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 516                 break;
 517
 518         case stylehint_Oblique:
 519                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 520                 break;
 521
 522         case stylehint_Proportional:
 523                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 524                 break;
 525
 526         case stylehint_TextColor:
 527                 color_format(val, color);
 528
 529                 if(!reverse_color)
 530                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 531                 else
 532                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 533
 534                 break;
 535
 536         case stylehint_BackColor:
 537                 color_format(val, color);
 538
 539                 if(!reverse_color)
 540                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 541                 else
 542                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 543
 544                 break;
 545
 546         case stylehint_ReverseColor:
 547                 if(reverse_color != val) {
 548                         /* Flip the fore- and background colors */
 549                         GdkColor* foreground_color;
 550                         GdkColor* background_color;
 551                         gint f_set, b_set = 0;
 552                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 553
 554                         if(f_set)
 555                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 556                         if(b_set)
 557                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 558
 559                         if(b_set)
 560                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 561                         else
 562                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 563
 564                         if(f_set)
 565                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 566                         else
 567                                 g_object_set(tag_object, "background", "#000000", NULL);
 568                 }
 569                 break;
 570
 571         default:
 572                 WARNING("Unknown style hint");
 573         }
 574 }
 575 /*Internal function: queries a text tag for the value of a given style hint */
 576 static gint
 577 query_tag(GtkTextTag *tag, glui32 hint)
 578 {
 579         gint intval;
 580         GObject *objval;
 581         GdkColor *colval;
 582
 583         g_return_val_if_fail(tag != NULL, 0);
 584
 585         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 586
 587         switch(hint) {
 588         case stylehint_Indentation:
 589                 g_object_get(tag, "left_margin", &intval, NULL);
 590                 return intval/5;
 591                 break;
 592
 593         case stylehint_ParaIndentation:
 594                 g_object_get(tag, "indent", &intval, NULL);
 595                 return intval/5;
 596                 break;
 597
 598         case stylehint_Justification:
 599                 g_object_get(tag, "justification", &intval, NULL);
 600                 switch(intval) {
 601                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 602                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 603                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 604                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 605                         default:
 606                                 WARNING("Unknown justification");
 607                                 return stylehint_just_LeftFlush;
 608                 }
 609                 break;
 610
 611         case stylehint_Weight:
 612                 g_object_get(tag, "weight", &intval, NULL);
 613                 switch(intval) {
 614                         case PANGO_WEIGHT_LIGHT: return -1; break;
 615                         case PANGO_WEIGHT_NORMAL: return 0; break;
 616                         case PANGO_WEIGHT_BOLD: return 1; break;
 617                         default: WARNING("Unknown font weight"); return 0;
 618                 }
 619                 break;
 620
 621         case stylehint_Size:
 622                 g_object_get(tag, "size", &intval, NULL);
 623                 return (intval/2)-14;
 624                 break;
 625
 626         case stylehint_Oblique:
 627                 g_object_get(tag, "style", &intval , NULL);
 628                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 629                 break;
 630
 631         case stylehint_Proportional:
 632                 g_object_get(tag, "font-desc", &objval, NULL);
 633                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 634                 break;
 635
 636         case stylehint_TextColor:
 637                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 638                 return color_parse_gdk(colval);
 639                 break;
 640
 641         case stylehint_BackColor:
 642                 g_object_get(tag, "background-gdk", &colval, NULL);
 643                 return color_parse_gdk(colval);
 644                 break;
 645
 646         case stylehint_ReverseColor:
 647                 /* FIXME: implement this */
 648                 return 0;
 649                 break;
 650
 651         default:
 652                 WARNING("Unknown style hint");
 653         }
 654
 655         return 0;
 656 }
 657
 658 /**
 659  * glk_stylehint_set:
 660  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 661  * @styl: The style to set a hint for.
 662  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 663  * @val: The style hint. The meaning of this depends on @hint.
 664  *
 665  * Sets a hint about the appearance of one style for a particular type of
 666  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 667  * all types of window.
 668  * <note><para>
 669  *  There is no equivalent constant to set a hint for all styles of a single
 670  *  window type.
 671  * </para></note>
 672  */
 673 void
 674 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 675 {
 676         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 677
 678         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 679                 style_init();
 680         }
 681
 682         GtkTextTag *to_change;
 683         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 684                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 685                 apply_stylehint_to_tag(to_change, hint, val);
 686         }
 687
 688         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 689                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 690                 apply_stylehint_to_tag(to_change, hint, val);
 691         }
 692 }
 693
 694 void
 695 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 696 {
 697         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 698         GtkTextTag *tag;
 699
 700         switch(wintype) {
 701         case wintype_TextBuffer:
 702                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 703                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 704                 break;
 705         case wintype_TextGrid:
 706                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 707                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 708         default:
 709                 return;
 710         }
 711 }
 712
 713 glui32
 714 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 715 {
 716         return styl1 != styl2;
 717 }
 718
 719 glui32
 720 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 721 {
 722         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 723         GtkTextTag *tag;
 724
 725         switch(win->type) {
 726         case wintype_TextBuffer:
 727                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 728                 *result = query_tag(tag, hint);
 729                 break;
 730         case wintype_TextGrid:
 731                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 732                 *result = query_tag(tag, hint);
 733         default:
 734                 return FALSE;
 735         }
 736
 737         return TRUE;
 738 }