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