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 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         if(str->window == NULL)
  71                 return;
  72
  73         flush_window_buffer(str->window);
  74         str->style = get_tag_name(styl);
  75 }
  76
  77 /* Internal function: call this to initialize the default styles to a textbuffer. */
  78 void
  79 style_init_textbuffer(GtkTextBuffer *buffer)
  80 {
  81         g_return_if_fail(buffer != NULL);
  82
  83         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  84         if( G_UNLIKELY(!glk_data->style_initialized) ) {
  85                 style_init();
  86         }
  87
  88         /* Copy the current text tags to the textbuffer's tag table */
  89         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  90 }
  91
  92 /* Internal function: call this to initialize the default styles to a textgrid. */
  93 void
  94 style_init_textgrid(GtkTextBuffer *buffer)
  95 {
  96         g_return_if_fail(buffer != NULL);
  97
  98         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  99         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 100                 style_init();
 101         }
 102
 103         /* Copy the current text tags to the textgrid's tag table */
 104         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 105 }
 106
 107 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 108 static void
 109 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 110 {
 111         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 112 }
 113
 114 /* Internal function used to iterate over a style table, copying it */
 115 static void
 116 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 117 {
 118         g_return_if_fail(key != NULL);
 119         g_return_if_fail(tag != NULL);
 120         g_return_if_fail(target_table != NULL);
 121
 122         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 123 }
 124
 125 /* Internal function that copies a text tag */
 126 GtkTextTag*
 127 gtk_text_tag_copy(GtkTextTag *tag)
 128 {
 129         GtkTextTag *copy;
 130
 131         g_return_val_if_fail(tag != NULL, NULL);
 132
 133         copy = gtk_text_tag_new(tag->name);
 134         gtk_text_attributes_copy_values(tag->values, copy->values);
 135
 136         #define _COPY_FLAG(flag) copy->flag = tag->flag
 137                 _COPY_FLAG (bg_color_set);
 138                 _COPY_FLAG (bg_color_set);
 139                 _COPY_FLAG (bg_stipple_set);
 140                 _COPY_FLAG (fg_color_set);
 141                 _COPY_FLAG (fg_stipple_set);
 142                 _COPY_FLAG (justification_set);
 143                 _COPY_FLAG (left_margin_set);
 144                 _COPY_FLAG (indent_set);
 145                 _COPY_FLAG (rise_set);
 146                 _COPY_FLAG (strikethrough_set);
 147                 _COPY_FLAG (right_margin_set);
 148                 _COPY_FLAG (pixels_above_lines_set);
 149                 _COPY_FLAG (pixels_below_lines_set);
 150                 _COPY_FLAG (pixels_inside_wrap_set);
 151                 _COPY_FLAG (tabs_set);
 152                 _COPY_FLAG (underline_set);
 153                 _COPY_FLAG (wrap_mode_set);
 154                 _COPY_FLAG (bg_full_height_set);
 155                 _COPY_FLAG (invisible_set);
 156                 _COPY_FLAG (editable_set);
 157                 _COPY_FLAG (language_set);
 158         #undef _COPY_FLAG
 159
 160         /* Copy the data that was added manually */
 161         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 162
 163         if(reverse_color)
 164                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 165
 166         return copy;
 167 }
 168
 169 /* Internal function that reads the default styles from a CSS file */
 170 void
 171 style_init()
 172 {
 173         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 174         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 175         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 176         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 177         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 178         GtkTextTag *tag;
 179
 180         /* Initialise the default styles for a text grid */
 181         tag = gtk_text_tag_new("normal");
 182         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 183         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 184
 185         tag = gtk_text_tag_new("emphasized");
 186         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 187         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 188
 189         tag = gtk_text_tag_new("preformatted");
 190         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 191         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 192
 193         tag = gtk_text_tag_new("header");
 194         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 195         g_hash_table_insert(default_text_grid_styles, "header", tag);
 196
 197         tag = gtk_text_tag_new("subheader");
 198         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 199         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 200
 201         tag = gtk_text_tag_new("alert");
 202         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 203         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 204
 205         tag = gtk_text_tag_new("note");
 206         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 207         g_hash_table_insert(default_text_grid_styles, "note", tag);
 208
 209         tag = gtk_text_tag_new("block-quote");
 210         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 211         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 212
 213         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 214         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 215         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 216
 217         tag = gtk_text_tag_new("hyperlink");
 218         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 219         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 220
 221         /* Tags for the textbuffer */
 222         tag = gtk_text_tag_new("normal");
 223         g_object_set(tag, "font-desc", glk_data->default_font_desc, NULL);
 224         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 225
 226         tag = gtk_text_tag_new("emphasized");
 227         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 228         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 229
 230         tag = gtk_text_tag_new("preformatted");
 231         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 232         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 233
 234         tag = gtk_text_tag_new("header");
 235         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 236         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 237
 238         tag = gtk_text_tag_new("subheader");
 239         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 240         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 241
 242         tag = gtk_text_tag_new("alert");
 243         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 244         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 245
 246         tag = gtk_text_tag_new("note");
 247         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 248         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 249
 250         tag = gtk_text_tag_new("block-quote");
 251         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 252         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 253
 254         g_hash_table_insert(default_text_buffer_styles, "input", gtk_text_tag_new("input"));
 255         g_hash_table_insert(default_text_buffer_styles, "user1", gtk_text_tag_new("user1"));
 256         g_hash_table_insert(default_text_buffer_styles, "user2", gtk_text_tag_new("user2"));
 257
 258         tag = gtk_text_tag_new("hyperlink");
 259         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 260         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 261
 262         glk_data->default_styles->text_grid = default_text_grid_styles;
 263         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 264
 265         /* Create the CSS file scanner */
 266         GScanner *scanner = g_scanner_new(NULL);
 267
 268         int f = open(glk_data->css_file, O_RDONLY);
 269         if(f != -1)
 270         {
 271                 g_scanner_input_file(scanner, f);
 272                 scanner->input_name = glk_data->css_file;
 273                 scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 274                 scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 275                 scanner->config->symbol_2_token = TRUE;
 276                 scanner->config->cpair_comment_single = NULL;
 277                 scanner->config->scan_float = FALSE;
 278
 279                 /* Run the scanner over the CSS file, overriding defaults */
 280                 while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 281                         if( !style_accept_style_selector(scanner) )
 282                                 break;
 283                 }
 284
 285                 g_scanner_destroy(scanner);
 286         }
 287         else
 288                 g_warning("Could not find CSS file");
 289
 290         /* Set the current style to a copy of the default style */
 291         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 292         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 293         glk_data->current_styles->text_grid = current_text_grid_styles;
 294         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 295
 296         glk_data->style_initialized = TRUE;
 297 }
 298
 299 /* Internal function: parses a token */
 300 static gboolean
 301 style_accept(GScanner *scanner, GTokenType token)
 302 {
 303         GTokenType next = g_scanner_get_next_token(scanner);
 304         if(next != token ) {
 305                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 306                 return FALSE;
 307         } else {
 308                 return TRUE;
 309         }
 310 }
 311
 312 /* Internal function: parses a style selector */
 313 static gboolean
 314 style_accept_style_selector(GScanner *scanner)
 315 {
 316         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 317
 318         GtkTextTag *current_tag;
 319         gchar *field;
 320         GTokenType token = g_scanner_get_next_token(scanner);
 321         GTokenValue value = g_scanner_cur_value(scanner);
 322
 323         if(
 324                 token != G_TOKEN_IDENTIFIER ||
 325                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 326         ) {
 327                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 328                 return FALSE;
 329         }
 330
 331         field = g_strdup(value.v_identifier);
 332
 333         if( !style_accept(scanner, '.') )
 334                 return FALSE;
 335
 336         token = g_scanner_get_next_token(scanner);
 337         value = g_scanner_cur_value(scanner);
 338
 339         if(token != G_TOKEN_IDENTIFIER) {
 340                 g_scanner_error(scanner, "CSS Error: style selector expected");
 341                 return FALSE;
 342         }
 343
 344         if( !strcmp(field, "buffer") )
 345                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 346         else
 347                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 348
 349         if(current_tag == NULL) {
 350                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 351                 return FALSE;
 352         }
 353
 354         if( !style_accept(scanner, '{') )
 355                 return FALSE;
 356
 357         while( g_scanner_peek_next_token(scanner) != '}') {
 358                 if( !style_accept_style_hint(scanner, current_tag) )
 359                         return FALSE;
 360         }
 361
 362         if( !style_accept(scanner, '}') )
 363                 return FALSE;
 364
 365         return TRUE;
 366 }
 367
 368 /* Internal function: parses a style hint */
 369 static gboolean
 370 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 371 {
 372         GTokenType token = g_scanner_get_next_token(scanner);
 373         GTokenValue value = g_scanner_cur_value(scanner);
 374         gchar *hint;
 375
 376         if(token != G_TOKEN_IDENTIFIER) {
 377                 g_scanner_error(scanner, "CSS Error: style hint expected");
 378                 return FALSE;
 379         }
 380
 381         hint = g_strdup(value.v_identifier);
 382
 383         if( !style_accept(scanner, ':') )
 384                 return FALSE;
 385
 386         token = g_scanner_get_next_token(scanner);
 387         value = g_scanner_cur_value(scanner);
 388
 389         if( !strcmp(hint, "font-family") ) {
 390                 if(token != G_TOKEN_STRING) {
 391                         g_scanner_error(scanner, "CSS Error: string expected");
 392                         return FALSE;
 393                 }
 394                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 395         }
 396         else if( !strcmp(hint, "font-weight") ) {
 397                 if(token != G_TOKEN_IDENTIFIER) {
 398                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 399                         return FALSE;
 400                 }
 401
 402                 if( !strcmp(value.v_identifier, "bold") )
 403                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 404                 else if( !strcmp(value.v_identifier, "normal") )
 405                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 406                 else {
 407                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 408                         return FALSE;
 409                 }
 410         }
 411         else if( !strcmp(hint, "font-style") ) {
 412                 if(token != G_TOKEN_IDENTIFIER) {
 413                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 414                         return FALSE;
 415                 }
 416
 417                 if( !strcmp(value.v_identifier, "italic") )
 418                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 419                 else if( !strcmp(value.v_identifier, "normal") )
 420                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 421                 else {
 422                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 423                         return FALSE;
 424                 }
 425         }
 426         else if( !strcmp(hint, "font-size") ) {
 427                 if(token == G_TOKEN_INT)
 428                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 429                 else if(token == G_TOKEN_FLOAT)
 430                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 431                 else {
 432                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 433                         return FALSE;
 434                 }
 435         }
 436         else if( !strcmp(hint, "color") ) {
 437                 if(token != G_TOKEN_IDENTIFIER) {
 438                         g_scanner_error(scanner, "CSS Error: hex color expected");
 439                         return FALSE;
 440                 }
 441
 442                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 443         }
 444         else if( !strcmp(hint, "background-color") ) {
 445                 if(token != G_TOKEN_IDENTIFIER) {
 446                         g_scanner_error(scanner, "CSS Error: hex color expected");
 447                         return FALSE;
 448                 }
 449                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 450         }
 451         else if( !strcmp(hint, "text-align") ) {
 452                 if(token != G_TOKEN_IDENTIFIER) {
 453                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 454                         return FALSE;
 455                 }
 456
 457                 if( !strcmp(value.v_identifier, "left") )
 458                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 459                 else if( !strcmp(value.v_identifier, "right") )
 460                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 461                 else if( !strcmp(value.v_identifier, "center") )
 462                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 463                 else {
 464                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 465                         return FALSE;
 466                 }
 467         }
 468         else if( !strcmp(hint, "margin-left") ) {
 469                 if(token != G_TOKEN_INT) {
 470                         g_scanner_error(scanner, "CSS Error: integer expected");
 471                         return FALSE;
 472                 }
 473                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 474         }
 475         else if( !strcmp(hint, "margin-right") ) {
 476                 if(token != G_TOKEN_INT) {
 477                         g_scanner_error(scanner, "CSS Error: integer expected");
 478                         return FALSE;
 479                 }
 480                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 481         }
 482         else if( !strcmp(hint, "margin-top") ) {
 483                 if(token != G_TOKEN_INT) {
 484                         g_scanner_error(scanner, "CSS Error: integer expected");
 485                         return FALSE;
 486                 }
 487                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 488         }
 489         else if( !strcmp(hint, "margin-bottom") ) {
 490                 if(token != G_TOKEN_INT) {
 491                         g_scanner_error(scanner, "CSS Error: integer expected");
 492                         return FALSE;
 493                 }
 494                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 495         }
 496
 497         else {
 498                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 499                 return FALSE;
 500         }
 501
 502         if( !style_accept(scanner, ';') )
 503                 return FALSE;
 504
 505         return TRUE;
 506 }
 507
 508 /* Internal function: parses a glk color to a #hex-value */
 509 static void
 510 color_format(glui32 val, gchar *buffer)
 511 {
 512         g_return_if_fail(buffer != NULL);
 513
 514         sprintf(buffer, "#%02X%02X%02X",
 515                 ((val & 0xff0000) >> 16),
 516                 ((val & 0x00ff00) >> 8),
 517                 (val & 0x0000ff)
 518         );
 519 }
 520
 521 /* Internal function: parses a GdkColor to a glk color */
 522 static glui32
 523 color_parse_gdk(GdkColor *color)
 524 {
 525         g_return_val_if_fail(color != NULL, 0);
 526         return (glui32) color->pixel;
 527 }
 528
 529 /* Internal function: changes a GTK tag to correspond with the given style. */
 530 static void
 531 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 532 {
 533         g_return_if_fail(tag != NULL);
 534
 535         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 536         GObject *tag_object = G_OBJECT(tag);
 537
 538         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 539
 540         int i = 0;
 541         gchar color[20];
 542         switch(hint) {
 543         case stylehint_Indentation:
 544                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 545                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 546                 break;
 547
 548         case stylehint_ParaIndentation:
 549                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 550                 break;
 551
 552         case stylehint_Justification:
 553                 switch(val) {
 554                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 555                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 556                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 557                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 558                         default:
 559                                 WARNING("Unknown justification");
 560                                 i = GTK_JUSTIFY_LEFT;
 561                 }
 562                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 563                 break;
 564
 565         case stylehint_Weight:
 566                 switch(val) {
 567                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 568                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 569                         case  1: i = PANGO_WEIGHT_BOLD; break;
 570                         default: WARNING("Unknown font weight");
 571                 }
 572                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 573                 break;
 574
 575         case stylehint_Size:
 576                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 577                 break;
 578
 579         case stylehint_Oblique:
 580                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 581                 break;
 582
 583         case stylehint_Proportional:
 584                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 585                 break;
 586
 587         case stylehint_TextColor:
 588                 color_format(val, color);
 589
 590                 if(!reverse_color)
 591                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 592                 else
 593                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 594
 595                 break;
 596
 597         case stylehint_BackColor:
 598                 color_format(val, color);
 599
 600                 if(!reverse_color)
 601                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 602                 else
 603                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 604
 605                 break;
 606
 607         case stylehint_ReverseColor:
 608                 if(reverse_color != val) {
 609                         /* Flip the fore- and background colors */
 610                         GdkColor* foreground_color;
 611                         GdkColor* background_color;
 612                         gint f_set, b_set = 0;
 613                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 614
 615                         if(f_set)
 616                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 617                         if(b_set)
 618                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 619
 620                         if(b_set)
 621                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 622                         else
 623                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 624
 625                         if(f_set)
 626                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 627                         else
 628                                 g_object_set(tag_object, "background", "#000000", NULL);
 629
 630                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 631                 }
 632                 break;
 633
 634         default:
 635                 WARNING("Unknown style hint");
 636         }
 637 }
 638 /*Internal function: queries a text tag for the value of a given style hint */
 639 static gint
 640 query_tag(GtkTextTag *tag, glui32 hint)
 641 {
 642         gint intval;
 643         GObject *objval;
 644         GdkColor *colval;
 645
 646         g_return_val_if_fail(tag != NULL, 0);
 647
 648         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 649
 650         switch(hint) {
 651         case stylehint_Indentation:
 652                 g_object_get(tag, "left_margin", &intval, NULL);
 653                 return intval/5;
 654                 break;
 655
 656         case stylehint_ParaIndentation:
 657                 g_object_get(tag, "indent", &intval, NULL);
 658                 return intval/5;
 659                 break;
 660
 661         case stylehint_Justification:
 662                 g_object_get(tag, "justification", &intval, NULL);
 663                 switch(intval) {
 664                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 665                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 666                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 667                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 668                         default:
 669                                 WARNING("Unknown justification");
 670                                 return stylehint_just_LeftFlush;
 671                 }
 672                 break;
 673
 674         case stylehint_Weight:
 675                 g_object_get(tag, "weight", &intval, NULL);
 676                 switch(intval) {
 677                         case PANGO_WEIGHT_LIGHT: return -1; break;
 678                         case PANGO_WEIGHT_NORMAL: return 0; break;
 679                         case PANGO_WEIGHT_BOLD: return 1; break;
 680                         default: WARNING("Unknown font weight"); return 0;
 681                 }
 682                 break;
 683
 684         case stylehint_Size:
 685                 g_object_get(tag, "size", &intval, NULL);
 686                 return (intval/2)-14;
 687                 break;
 688
 689         case stylehint_Oblique:
 690                 g_object_get(tag, "style", &intval , NULL);
 691                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 692                 break;
 693
 694         case stylehint_Proportional:
 695                 g_object_get(tag, "font-desc", &objval, NULL);
 696                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 697                 break;
 698
 699         case stylehint_TextColor:
 700                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 701                 return color_parse_gdk(colval);
 702                 break;
 703
 704         case stylehint_BackColor:
 705                 g_object_get(tag, "background-gdk", &colval, NULL);
 706                 return color_parse_gdk(colval);
 707                 break;
 708
 709         case stylehint_ReverseColor:
 710                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 711                 break;
 712
 713         default:
 714                 WARNING("Unknown style hint");
 715         }
 716
 717         return 0;
 718 }
 719
 720 /**
 721  * glk_stylehint_set:
 722  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 723  * @styl: The style to set a hint for.
 724  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 725  * @val: The style hint. The meaning of this depends on @hint.
 726  *
 727  * Sets a hint about the appearance of one style for a particular type of
 728  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 729  * all types of window.
 730  * <note><para>
 731  *  There is no equivalent constant to set a hint for all styles of a single
 732  *  window type.
 733  * </para></note>
 734  */
 735 void
 736 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 737 {
 738         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 739
 740         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 741                 style_init();
 742         }
 743
 744         GtkTextTag *to_change;
 745         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 746                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 747                 apply_stylehint_to_tag(to_change, hint, val);
 748         }
 749
 750         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 751                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 752                 apply_stylehint_to_tag(to_change, hint, val);
 753         }
 754 }
 755
 756 /**
 757  * glk_stylehint_clear:
 758  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 759  * @styl: The style to set a hint for.
 760  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 761  *
 762  * Resets a hint about the appearance of one style for a particular type of
 763  * window to it's default value. You can also set wintype to %wintype_AllTypes, which resets a hint for
 764  * all types of window.
 765  * <note><para>
 766  *  There is no equivalent constant to reset a hint for all styles of a single
 767  *  window type.
 768  * </para></note>
 769  */
 770 void
 771 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 772 {
 773         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 774         GtkTextTag *tag;
 775
 776         switch(wintype) {
 777         case wintype_TextBuffer:
 778                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 779                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 780                 break;
 781         case wintype_TextGrid:
 782                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 783                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 784         default:
 785                 return;
 786         }
 787 }
 788
 789 /**
 790  * glk_style_distinguish:
 791  * @win: The window in which the styles are to be distinguished.
 792  * @styl1: The first style to be distinguished from the second style.
 793  * @styl2: The second styel to be distinguished from the first style.
 794  *
 795  * Returns: TRUE if the two styles are visually distinguishable in the given window.
 796  * If they are not, it returns FALSE.
 797  */
 798 glui32
 799 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 800 {
 801         return styl1 != styl2;
 802 }
 803
 804 /**
 805  * glk_style_measure:
 806  * @win: The window from which to take the style.
 807  * @styl: The style to perform the measurement on.
 808  * @hint: The stylehint to measure.
 809  * @result: Address to write the result to.
 810  *
 811  * This function can be used to query the current value of a particular style hint.
 812  * Returns: TRUE upon successul retrievel, otherwise FALSE.
 813  */
 814 glui32
 815 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 816 {
 817         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 818         GtkTextTag *tag;
 819
 820         switch(win->type) {
 821         case wintype_TextBuffer:
 822                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 823                 *result = query_tag(tag, hint);
 824                 break;
 825         case wintype_TextGrid:
 826                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 827                 *result = query_tag(tag, hint);
 828         default:
 829                 return FALSE;
 830         }
 831
 832         return TRUE;
 833 }
 834
 835 /* Internal function returning the current default font for a window type
 836  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 837  * supported for now */
 838 PangoFontDescription*
 839 get_current_font(guint32 wintype)
 840 {
 841         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 842         GtkTextTag *normal;
 843
 844         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 845                 style_init();
 846         }
 847
 848         switch(wintype) {
 849         case wintype_TextGrid:
 850                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 851                 break;
 852         case wintype_TextBuffer:
 853                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 854                 break;
 855         default:
 856                 return NULL;
 857         }
 858
 859         PangoFontDescription *font;
 860         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 861
 862         return font;
 863 }