libchimara/style.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <math.h>
   4 #include "chimara-glk-private.h"
   5 #include "glk.h"
   6 #include "style.h"
   7 #include "magic.h"
   8 #include "stream.h"
   9 #include "strio.h"
  10
  11 extern GPrivate *glk_data_key;
  12
  13 static gboolean style_accept(GScanner *scanner, GTokenType token);
  14 static gboolean style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk);
  15 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  16 static void style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table);
  17 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
  18 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  19 static void style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background);
  20
  21 /**
  22  * glk_set_style:
  23  * @styl: The style to apply
  24  *
  25  * Changes the style of the current output stream. @styl should be one of the
  26  * <code>style_</code> constants. However, any value is actually legal; if the
  27  * interpreter does not recognize the style value, it will treat it as
  28  * %style_Normal.
  29  * <note><para>
  30  *  This policy allows for the future definition of styles without breaking old
  31  *  Glk libraries.
  32  * </para></note>
  33  */
  34 void
  35 glk_set_style(glui32 styl)
  36 {
  37         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  38         g_return_if_fail(glk_data->current_stream != NULL);
  39         glk_set_style_stream(glk_data->current_stream, styl);
  40 }
  41
  42 /* The first 11 tag names must correspond to the first 11 glk tag names as defined below */
  43 static const gchar* TAG_NAMES[] = {
  44         "normal",
  45         "emphasized",
  46         "preformatted",
  47         "header",
  48         "subheader",
  49         "alert",
  50         "note",
  51         "block-quote",
  52         "input",
  53         "user1",
  54         "user2",
  55         "hyperlink",
  56         "pager",
  57         "default"
  58 };
  59
  60 /* The first 11 glk tag names must correspond to the first 11 tag names as defined above */
  61 static const gchar* GLK_TAG_NAMES[] = {
  62         "glk-normal",
  63         "glk-emphasized",
  64         "glk-preformatted",
  65         "glk-header",
  66         "glk-subheader",
  67         "glk-alert",
  68         "glk-note",
  69         "glk-block-quote",
  70         "glk-input",
  71         "glk-user1",
  72         "glk-user2"
  73 };
  74
  75 const gchar**
  76 style_get_tag_names()
  77 {
  78         return TAG_NAMES;
  79 }
  80
  81 /* Internal function: mapping from style enum to tag name */
  82 static const gchar*
  83 get_tag_name(glui32 style)
  84 {
  85         if(style >= CHIMARA_NUM_STYLES) {
  86                 WARNING("Unsupported style");
  87                 return "normal";
  88         } else {
  89                 return (gchar*) TAG_NAMES[style];
  90         }
  91 }
  92
  93 /* Internal function: mapping from glk style enum to tag name */
  94 static const gchar*
  95 get_glk_tag_name(glui32 style)
  96 {
  97         if(style >= style_NUMSTYLES) {
  98                 WARNING("Unsupported style");
  99                 return "normal";
 100         } else {
 101                 return (gchar*) GLK_TAG_NAMES[style];
 102         }
 103 }
 104
 105 /**
 106  * glk_set_style_stream:
 107  * @str: Output stream to change the style of
 108  * @styl: The style to apply
 109  *
 110  * This changes the style of the stream @str. See glk_set_style().
 111  */
 112 void
 113 glk_set_style_stream(strid_t str, glui32 styl) {
 114 #ifdef DEBUG_STYLES
 115         g_printf("glk_set_style(str->rock=%d, styl=%d)\n", str->rock, styl);
 116 #endif
 117
 118         if(str->window == NULL)
 119                 return;
 120
 121         flush_window_buffer(str->window);
 122         str->style = (gchar*) get_tag_name(styl);
 123         str->glk_style = (gchar*) get_glk_tag_name(styl);
 124 }
 125
 126 /* Internal function: call this to initialize the layout of the 'more' prompt. */
 127 void
 128 style_init_more_prompt(winid_t win)
 129 {
 130         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 131
 132         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
 133         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
 134 }
 135
 136 /* Internal function: call this to initialize the default styles to a textbuffer. */
 137 void
 138 style_init_textbuffer(GtkTextBuffer *buffer)
 139 {
 140         g_return_if_fail(buffer != NULL);
 141
 142         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 143
 144         /* Place the default text tags in the textbuffer's tag table */
 145         g_hash_table_foreach(glk_data->styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 146
 147         /* Copy the override text tags to the textbuffers's tag table */
 148         g_hash_table_foreach(glk_data->glk_styles->text_buffer, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 149
 150         /* Assign the 'default' tag the lowest priority */
 151         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 152 }
 153
 154
 155 /* Internal function: call this to initialize the default styles to a textgrid. */
 156 void
 157 style_init_textgrid(GtkTextBuffer *buffer)
 158 {
 159         g_return_if_fail(buffer != NULL);
 160
 161         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 162
 163         /* Place the default text tags in the textbuffer's tag table */
 164         g_hash_table_foreach(glk_data->styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 165
 166         /* Copy the current text tags to the textbuffers's tag table */
 167         g_hash_table_foreach(glk_data->glk_styles->text_grid, style_copy_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 168
 169         /* Assign the 'default' tag the lowest priority */
 170         gtk_text_tag_set_priority( gtk_text_tag_table_lookup(gtk_text_buffer_get_tag_table(buffer), "default"), 0 );
 171 }
 172
 173 /* Internal function used to iterate over a style table, copying it */
 174 static void
 175 style_copy_tag_to_textbuffer(gpointer key, gpointer tag, gpointer target_table)
 176 {
 177         g_return_if_fail(key != NULL);
 178         g_return_if_fail(tag != NULL);
 179         g_return_if_fail(target_table != NULL);
 180
 181         gtk_text_tag_table_add(target_table, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 182 }
 183
 184 /* Internal function that copies a text tag */
 185 GtkTextTag *
 186 gtk_text_tag_copy(GtkTextTag *tag)
 187 {
 188         GtkTextTag *copy;
 189
 190         g_return_val_if_fail(tag != NULL, NULL);
 191
 192         copy = gtk_text_tag_new(tag->name);
 193         gtk_text_attributes_copy_values(tag->values, copy->values);
 194
 195         #define _COPY_FLAG(flag) copy->flag = tag->flag
 196                 _COPY_FLAG (bg_color_set);
 197                 _COPY_FLAG (bg_color_set);
 198                 _COPY_FLAG (bg_stipple_set);
 199                 _COPY_FLAG (fg_color_set);
 200                 _COPY_FLAG (fg_stipple_set);
 201                 _COPY_FLAG (justification_set);
 202                 _COPY_FLAG (left_margin_set);
 203                 _COPY_FLAG (indent_set);
 204                 _COPY_FLAG (rise_set);
 205                 _COPY_FLAG (strikethrough_set);
 206                 _COPY_FLAG (right_margin_set);
 207                 _COPY_FLAG (pixels_above_lines_set);
 208                 _COPY_FLAG (pixels_below_lines_set);
 209                 _COPY_FLAG (pixels_inside_wrap_set);
 210                 _COPY_FLAG (tabs_set);
 211                 _COPY_FLAG (underline_set);
 212                 _COPY_FLAG (wrap_mode_set);
 213                 _COPY_FLAG (bg_full_height_set);
 214                 _COPY_FLAG (invisible_set);
 215                 _COPY_FLAG (editable_set);
 216                 _COPY_FLAG (language_set);
 217                 _COPY_FLAG (scale_set);
 218         #undef _COPY_FLAG
 219
 220         /* Copy the data that was added manually */
 221         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 222
 223         if(reverse_color) {
 224                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 225         }
 226
 227         return copy;
 228 }
 229
 230 /* Internal function that constructs the default styles */
 231 void
 232 style_init(ChimaraGlk *glk)
 233 {
 234         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 235
 236         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 237         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 238         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 239         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 240         GtkTextTag *tag;
 241
 242         PangoFontDescription *default_font_desc = pango_font_description_from_string("Serif");
 243         PangoFontDescription *monospace_font_desc = pango_font_description_from_string("Monospace");
 244
 245         /* Initialise the default styles for a text grid */
 246         tag = gtk_text_tag_new("default");
 247         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 248         g_hash_table_insert(default_text_grid_styles, "default", tag);
 249
 250         tag = gtk_text_tag_new("normal");
 251         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 252
 253         tag = gtk_text_tag_new("emphasized");
 254         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 255         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 256
 257         tag = gtk_text_tag_new("preformatted");
 258         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 259
 260         tag = gtk_text_tag_new("header");
 261         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 262         g_hash_table_insert(default_text_grid_styles, "header", tag);
 263
 264         tag = gtk_text_tag_new("subheader");
 265         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 266         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 267
 268         tag = gtk_text_tag_new("alert");
 269         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 270         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 271
 272         tag = gtk_text_tag_new("note");
 273         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 274         g_hash_table_insert(default_text_grid_styles, "note", tag);
 275
 276         tag = gtk_text_tag_new("block-quote");
 277         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 278         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 279
 280         tag = gtk_text_tag_new("input");
 281         g_hash_table_insert(default_text_grid_styles, "input", tag);
 282
 283         tag = gtk_text_tag_new("user1");
 284         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 285
 286         tag = gtk_text_tag_new("user2");
 287         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 288
 289         tag = gtk_text_tag_new("hyperlink");
 290         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 291         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 292
 293         /* Initialise the default styles for a text buffer */
 294         tag = gtk_text_tag_new("default");
 295         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
 296         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 297
 298         tag = gtk_text_tag_new("normal");
 299         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 300
 301         tag = gtk_text_tag_new("emphasized");
 302         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 303         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 304
 305         tag = gtk_text_tag_new("preformatted");
 306         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 307         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 308
 309         tag = gtk_text_tag_new("header");
 310         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 311         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 312
 313         tag = gtk_text_tag_new("subheader");
 314         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 315         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 316
 317         tag = gtk_text_tag_new("alert");
 318         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 319         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 320
 321         tag = gtk_text_tag_new("note");
 322         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 323         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 324
 325         tag = gtk_text_tag_new("block-quote");
 326         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 327         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 328
 329         tag = gtk_text_tag_new("input");
 330         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 331
 332         tag = gtk_text_tag_new("user1");
 333         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 334
 335         tag = gtk_text_tag_new("user2");
 336         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 337
 338         tag = gtk_text_tag_new("hyperlink");
 339         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 340         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 341
 342         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 343         g_object_set(pager_tag, "family", "Monospace", "family-set", TRUE, "foreground", "#ffffff", "foreground-set", TRUE, "background", "#000000", "background-set", TRUE, NULL);
 344         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 345         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 346
 347         pango_font_description_free(default_font_desc);
 348         pango_font_description_free(monospace_font_desc);
 349
 350         priv->styles->text_grid = default_text_grid_styles;
 351         priv->styles->text_buffer = default_text_buffer_styles;
 352
 353
 354         /* Initialize the GLK styles to empty tags */
 355         int i;
 356         for(i=0; i<style_NUMSTYLES; i++) {
 357                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 358                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 359                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 360                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 361         }
 362
 363         priv->glk_styles->text_grid = glk_text_grid_styles;
 364         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 365
 366 }
 367
 368 /* Reset style tables to the library's internal defaults */
 369 void
 370 reset_default_styles(ChimaraGlk *glk)
 371 {
 372         /* TODO: write this function */
 373 }
 374
 375 /* Create the CSS file scanner */
 376 GScanner *
 377 create_css_file_scanner(void)
 378 {
 379         GScanner *scanner = g_scanner_new(NULL);
 380         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 381         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 382         scanner->config->symbol_2_token = TRUE;
 383         scanner->config->cpair_comment_single = NULL;
 384         scanner->config->scan_float = FALSE;
 385         return scanner;
 386 }
 387
 388 /* Run the scanner over the CSS file, overriding the default styles */
 389 void
 390 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 391 {
 392         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 393                 if( !style_accept_style_selector(scanner, glk) )
 394                         break;
 395         }
 396
 397         g_scanner_destroy(scanner);
 398
 399         /* Update the pager prompt to the new style */
 400         style_update(glk);
 401 }
 402
 403 /* Internal function: parses a token */
 404 static gboolean
 405 style_accept(GScanner *scanner, GTokenType token)
 406 {
 407         GTokenType next = g_scanner_get_next_token(scanner);
 408         if(next != token) {
 409                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 410                 return FALSE;
 411         }
 412         return TRUE;
 413 }
 414
 415 /* Internal function: parses a style selector */
 416 static gboolean
 417 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 418 {
 419         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 420
 421         GtkTextTag *current_tag;
 422         gchar *field;
 423         GTokenType token = g_scanner_get_next_token(scanner);
 424         GTokenValue value = g_scanner_cur_value(scanner);
 425
 426         if(
 427                 token != G_TOKEN_IDENTIFIER ||
 428                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 429         ) {
 430                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 431                 return FALSE;
 432         }
 433
 434         field = g_strdup(value.v_identifier);
 435
 436         /* Parse the tag name to change */
 437         if( g_scanner_peek_next_token(scanner) == '{') {
 438                 style_accept(scanner, '{');
 439                 if( !strcmp(field, "buffer") )
 440                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 441                 else
 442                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 443         } else {
 444                 if( !style_accept(scanner, '.') )
 445                         return FALSE;
 446
 447                 token = g_scanner_get_next_token(scanner);
 448                 value = g_scanner_cur_value(scanner);
 449
 450                 if(token != G_TOKEN_IDENTIFIER) {
 451                         g_scanner_error(scanner, "CSS Error: style selector expected");
 452                         return FALSE;
 453                 }
 454
 455                 if( !strcmp(field, "buffer") )
 456                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 457                 else
 458                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 459
 460                 if(current_tag == NULL) {
 461                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 462                         return FALSE;
 463                 }
 464
 465                 if( !style_accept(scanner, '{') )
 466                         return FALSE;
 467         }
 468
 469         while( g_scanner_peek_next_token(scanner) != '}') {
 470                 if( !style_accept_style_hint(scanner, current_tag) )
 471                         return FALSE;
 472         }
 473
 474         if( !style_accept(scanner, '}') )
 475                 return FALSE;
 476
 477         return TRUE;
 478 }
 479
 480 /* Internal function: parses a style hint */
 481 static gboolean
 482 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 483 {
 484         GTokenType token = g_scanner_get_next_token(scanner);
 485         GTokenValue value = g_scanner_cur_value(scanner);
 486         gchar *hint;
 487
 488         if(token != G_TOKEN_IDENTIFIER) {
 489                 g_scanner_error(scanner, "CSS Error: style hint expected");
 490                 return FALSE;
 491         }
 492
 493         hint = g_strdup(value.v_identifier);
 494
 495         if( !style_accept(scanner, ':') )
 496                 return FALSE;
 497
 498         token = g_scanner_get_next_token(scanner);
 499         value = g_scanner_cur_value(scanner);
 500
 501         if( !strcmp(hint, "font-family") ) {
 502                 if(token != G_TOKEN_STRING) {
 503                         g_scanner_error(scanner, "CSS Error: string expected");
 504                         return FALSE;
 505                 }
 506                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 507         }
 508         else if( !strcmp(hint, "font-weight") ) {
 509                 if(token != G_TOKEN_IDENTIFIER) {
 510                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 511                         return FALSE;
 512                 }
 513
 514                 if( !strcmp(value.v_identifier, "bold") )
 515                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 516                 else if( !strcmp(value.v_identifier, "normal") )
 517                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 518                 else {
 519                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 520                         return FALSE;
 521                 }
 522         }
 523         else if( !strcmp(hint, "font-style") ) {
 524                 if(token != G_TOKEN_IDENTIFIER) {
 525                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 526                         return FALSE;
 527                 }
 528
 529                 if( !strcmp(value.v_identifier, "italic") )
 530                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 531                 else if( !strcmp(value.v_identifier, "normal") )
 532                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 533                 else {
 534                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 535                         return FALSE;
 536                 }
 537         }
 538         else if( !strcmp(hint, "font-size") ) {
 539                 if(token == G_TOKEN_INT)
 540                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 541                 else if(token == G_TOKEN_FLOAT)
 542                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 543                 else {
 544                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 545                         return FALSE;
 546                 }
 547         }
 548         else if( !strcmp(hint, "color") ) {
 549                 if(token != G_TOKEN_IDENTIFIER) {
 550                         g_scanner_error(scanner, "CSS Error: hex color expected");
 551                         return FALSE;
 552                 }
 553
 554                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 555         }
 556         else if( !strcmp(hint, "background-color") ) {
 557                 if(token != G_TOKEN_IDENTIFIER) {
 558                         g_scanner_error(scanner, "CSS Error: hex color expected");
 559                         return FALSE;
 560                 }
 561                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 562         }
 563         else if( !strcmp(hint, "text-align") ) {
 564                 if(token != G_TOKEN_IDENTIFIER) {
 565                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 566                         return FALSE;
 567                 }
 568
 569                 if( !strcmp(value.v_identifier, "left") )
 570                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 571                 else if( !strcmp(value.v_identifier, "right") )
 572                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 573                 else if( !strcmp(value.v_identifier, "center") )
 574                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 575                 else {
 576                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 577                         return FALSE;
 578                 }
 579         }
 580         else if( !strcmp(hint, "margin-left") ) {
 581                 if(token != G_TOKEN_INT) {
 582                         g_scanner_error(scanner, "CSS Error: integer expected");
 583                         return FALSE;
 584                 }
 585                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 586         }
 587         else if( !strcmp(hint, "margin-right") ) {
 588                 if(token != G_TOKEN_INT) {
 589                         g_scanner_error(scanner, "CSS Error: integer expected");
 590                         return FALSE;
 591                 }
 592                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 593         }
 594         else if( !strcmp(hint, "margin-top") ) {
 595                 if(token != G_TOKEN_INT) {
 596                         g_scanner_error(scanner, "CSS Error: integer expected");
 597                         return FALSE;
 598                 }
 599                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 600         }
 601         else if( !strcmp(hint, "margin-bottom") ) {
 602                 if(token != G_TOKEN_INT) {
 603                         g_scanner_error(scanner, "CSS Error: integer expected");
 604                         return FALSE;
 605                 }
 606                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 607         }
 608
 609         else {
 610                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 611                 return FALSE;
 612         }
 613
 614         if( !style_accept(scanner, ';') )
 615                 return FALSE;
 616
 617         return TRUE;
 618 }
 619
 620 /* Internal function: parses a glk color to a GdkColor */
 621 void
 622 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 623 {
 624         color->red = 256 * ((val & 0xff0000) >> 16);
 625         color->green = 256 * ((val & 0x00ff00) >> 8);
 626         color->blue = 256 * (val & 0x0000ff);
 627 }
 628
 629 /* Internal function: parses a glk color to a hex string */
 630 gchar*
 631 glkcolor_to_hex(glui32 val)
 632 {
 633         return g_strdup_printf("%04X%04X%04X",
 634                 256 * ((val & 0xff0000) >> 16),
 635                 256 * ((val & 0x00ff00) >> 8),
 636                 256 * (val & 0x0000ff)
 637         );
 638 }
 639
 640 /* Internal function: parses a gdk color to a hex string */
 641 gchar*
 642 gdkcolor_to_hex(GdkColor *color)
 643 {
 644         return g_strdup_printf("%04X%04X%04X",
 645                 color->red, color->green, color->blue
 646         );
 647 }
 648
 649 /* Internal function: parses a GdkColor to a glk color */
 650 static glui32
 651 gdkcolor_to_glkcolor(GdkColor *color)
 652 {
 653         g_return_val_if_fail(color != NULL, 0);
 654         return (glui32) color->pixel;
 655 }
 656
 657 /* Internal function: changes a GTK tag to correspond with the given style. */
 658 static void
 659 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 660 {
 661         g_return_if_fail(tag != NULL);
 662
 663         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 664         GObject *tag_object = G_OBJECT(tag);
 665
 666         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 667
 668         int i = 0;
 669         GdkColor color;
 670         switch(hint) {
 671         case stylehint_Indentation:
 672                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 673                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 674                 break;
 675
 676         case stylehint_ParaIndentation:
 677                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 678                 break;
 679
 680         case stylehint_Justification:
 681                 switch(val) {
 682                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 683                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 684                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 685                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 686                         default:
 687                                 WARNING("Unknown justification");
 688                                 i = GTK_JUSTIFY_LEFT;
 689                 }
 690                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 691                 break;
 692
 693         case stylehint_Weight:
 694                 switch(val) {
 695                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 696                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 697                         case  1: i = PANGO_WEIGHT_BOLD; break;
 698                         default: WARNING("Unknown font weight");
 699                 }
 700                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 701                 break;
 702
 703         case stylehint_Size:
 704                 {
 705                         gdouble scale = PANGO_SCALE_MEDIUM;
 706                         switch(val) {
 707                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 708                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 709                                 case -1: scale = PANGO_SCALE_SMALL; break;
 710                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 711                                 case  1: scale = PANGO_SCALE_LARGE; break;
 712                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 713                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 714                                 default:
 715                                         /* We follow Pango's convention of having each magnification
 716                                         step be a scaling of 1.2 */
 717                                         scale = pow(1.2, (double)val);
 718                         }
 719                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 720                 }
 721                 break;
 722
 723         case stylehint_Oblique:
 724                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 725                 break;
 726
 727         case stylehint_Proportional:
 728         {
 729                 gchar *font_family;
 730                 gboolean family_set;
 731
 732                 if(wintype != wintype_TextBuffer) {
 733                         if(val)
 734                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 735
 736                         break;
 737                 }
 738
 739                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 740                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 741                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 742                 g_free(font_family);
 743         }
 744                 break;
 745
 746         case stylehint_TextColor:
 747                 glkcolor_to_gdkcolor(val, &color);
 748
 749                 if(!reverse_color)
 750                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 751                 else
 752                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 753
 754                 break;
 755
 756         case stylehint_BackColor:
 757                 glkcolor_to_gdkcolor(val, &color);
 758
 759                 if(!reverse_color)
 760                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 761                 else
 762                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 763
 764                 break;
 765
 766         case stylehint_ReverseColor:
 767         {
 768                 // Determine the current colors
 769
 770                 // If all fails, use black/white
 771                 // FIXME: Use system theme here
 772                 GdkColor foreground, background;
 773                 gdk_color_parse("black", &foreground);
 774                 gdk_color_parse("white", &background);
 775                 GdkColor *current_foreground = &foreground;
 776                 GdkColor *current_background = &background;
 777
 778                 if(wintype == wintype_TextBuffer) {
 779                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 780                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 781                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 782                 }
 783                 else if(wintype == wintype_TextGrid) {
 784                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 785                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 786                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 787                 }
 788
 789                 if(val) {
 790                         /* Flip the fore- and background colors */
 791                         GdkColor *temp = current_foreground;
 792                         current_foreground = current_background;
 793                         current_background = temp;
 794                 }
 795
 796                 g_object_set(tag,
 797                         "foreground-gdk", current_foreground,
 798                         "foreground-set", TRUE,
 799                         "background-gdk", current_background,
 800                         "background-set", TRUE,
 801                         NULL
 802                 );
 803
 804                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 805                 break;
 806         }
 807
 808         default:
 809                 WARNING("Unknown style hint");
 810         }
 811 }
 812
 813 /* Internal function: queries a text tag for the value of a given style hint */
 814 static gint
 815 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 816 {
 817         gint intval;
 818         gdouble doubleval;
 819         GdkColor *colval;
 820
 821         g_return_val_if_fail(tag != NULL, 0);
 822
 823         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 824
 825         switch(hint) {
 826         case stylehint_Indentation:
 827                 g_object_get(tag, "left_margin", &intval, NULL);
 828                 return intval/5;
 829
 830         case stylehint_ParaIndentation:
 831                 g_object_get(tag, "indent", &intval, NULL);
 832                 return intval/5;
 833
 834         case stylehint_Justification:
 835                 g_object_get(tag, "justification", &intval, NULL);
 836                 switch(intval) {
 837                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 838                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 839                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 840                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 841                         default:
 842                                 WARNING("Unknown justification");
 843                                 return stylehint_just_LeftFlush;
 844                 }
 845
 846         case stylehint_Weight:
 847                 g_object_get(tag, "weight", &intval, NULL);
 848                 switch(intval) {
 849                         case PANGO_WEIGHT_LIGHT: return -1;
 850                         case PANGO_WEIGHT_NORMAL: return 0;
 851                         case PANGO_WEIGHT_BOLD: return 1;
 852                         default: WARNING("Unknown font weight"); return 0;
 853                 }
 854
 855         case stylehint_Size:
 856                 g_object_get(tag, "scale", &doubleval, NULL);
 857                 return (gint)round(log(doubleval) / log(1.2));
 858
 859         case stylehint_Oblique:
 860                 g_object_get(tag, "style", &intval , NULL);
 861                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 862
 863         case stylehint_Proportional:
 864                 /* Use pango_font_family_is_monospace()? */
 865         {
 866                 gchar *font_family, *query_font_family;
 867                 GtkTextTag *font_tag = g_hash_table_lookup(
 868                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 869                     "preformatted");
 870                 g_object_get(font_tag, "family", &font_family, NULL);
 871                 g_object_get(tag, "family", &query_font_family, NULL);
 872                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 873                 g_free(font_family);
 874                 g_free(query_font_family);
 875                 return retval;
 876         }
 877
 878         case stylehint_TextColor:
 879                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 880                 return gdkcolor_to_glkcolor(colval);
 881
 882         case stylehint_BackColor:
 883                 g_object_get(tag, "background-gdk", &colval, NULL);
 884                 return gdkcolor_to_glkcolor(colval);
 885
 886         case stylehint_ReverseColor:
 887                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 888
 889         default:
 890                 WARNING("Unknown style hint");
 891         }
 892
 893         return 0;
 894 }
 895
 896 /**
 897  * glk_stylehint_set:
 898  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 899  * @styl: The style to set a hint for.
 900  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 901  * @val: The style hint. The meaning of this depends on @hint.
 902  *
 903  * Sets a hint about the appearance of one style for a particular type of
 904  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 905  * all types of window.
 906  * <note><para>
 907  *  There is no equivalent constant to set a hint for all styles of a single
 908  *  window type.
 909  * </para></note>
 910  */
 911 void
 912 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 913 {
 914 #ifdef DEBUG_STYLES
 915         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 916 #endif
 917
 918         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 919
 920         GtkTextTag *to_change;
 921         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 922                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 923                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 924         }
 925
 926         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 927                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 928                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 929         }
 930 }
 931
 932 /**
 933  * glk_stylehint_clear:
 934  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 935  * @styl: The style to set a hint for.
 936  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 937  *
 938  * Clears a hint about the appearance of one style for a particular type of
 939  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 940  * which clears a hint for all types of window.
 941  * <note><para>
 942  *  There is no equivalent constant to reset a hint for all styles of a single
 943  *  window type.
 944  * </para></note>
 945  */
 946 void
 947 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 948 {
 949 #ifdef DEBUG_STYLES
 950         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 951 #endif
 952
 953         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 954         GtkTextTag *tag;
 955
 956         switch(wintype) {
 957         case wintype_TextBuffer:
 958                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 959                 if(tag) {
 960                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 961                 }
 962                 break;
 963         case wintype_TextGrid:
 964                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 965                 if(tag) {
 966                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 967                 }
 968         default:
 969                 return;
 970         }
 971 }
 972
 973 /**
 974  * glk_style_distinguish:
 975  * @win: The window in which the styles are to be distinguished.
 976  * @styl1: The first style to be distinguished from the second style.
 977  * @styl2: The second style to be distinguished from the first style.
 978  *
 979  * Decides whether two styles are visually distinguishable in the given window.
 980  * The exact meaning of this is left for the library to determine.
 981  * <note><title>Chimara</title><para>
 982  *   Currently, all styles of one window are assumed to be mutually
 983  *   distinguishable.
 984  * </para></note>
 985  *
 986  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 987  * are not, it returns %FALSE (0).
 988  */
 989 glui32
 990 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 991 {
 992 #ifdef DEBUG_STYLES
 993         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 994 #endif
 995
 996         /* FIXME */
 997         return styl1 != styl2;
 998 }
 999
1000 /**
1001  * glk_style_measure:
1002  * @win: The window from which to take the style.
1003  * @styl: The style to perform the measurement on.
1004  * @hint: The stylehint to measure.
1005  * @result: Address to write the result to.
1006  *
1007  * Tries to test an attribute of one style in the given window @win. The library
1008  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1009  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1010  * at by @result.
1011  * <note><para>
1012  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1013  * </para></note>
1014  *
1015  * The meaning of the value depends on the hint which was tested:
1016  * <variablelist>
1017  * <varlistentry>
1018  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1019  *   <listitem><para>The indentation and paragraph indentation. These are in a
1020  *   metric which is platform-dependent.</para>
1021  *   <note><para>Most likely either characters or pixels.</para></note>
1022  *   </listitem>
1023  * </varlistentry>
1024  * <varlistentry>
1025  *   <term>%stylehint_Justification</term>
1026  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1027  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1028  *   %stylehint_just_RightFlush.</para></listitem>
1029  * </varlistentry>
1030  * <varlistentry>
1031  *   <term>%stylehint_Size</term>
1032  *   <listitem><para>The font size. Again, this is in a platform-dependent
1033  *   metric.</para>
1034  *   <note><para>Pixels, points, or simply 1 if the library does not support
1035  *   varying font sizes.</para></note>
1036  *   </listitem>
1037  * </varlistentry>
1038  * <varlistentry>
1039  *   <term>%stylehint_Weight</term>
1040  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1041  *   and -1 for light-weight fonts.</para></listitem>
1042  * </varlistentry>
1043  * <varlistentry>
1044  *   <term>%stylehint_Oblique</term>
1045  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1046  *   </listitem>
1047  * </varlistentry>
1048  * <varlistentry>
1049  *   <term>%stylehint_Proportional</term>
1050  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1051  *   </para></listitem>
1052  * </varlistentry>
1053  * <varlistentry>
1054  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1055  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1056  *   described in <link
1057  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1058  *   Appearance of Styles</link>.</para></listitem>
1059  * </varlistentry>
1060  * <varlistentry>
1061  *   <term>%stylehint_ReverseColor</term>
1062  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1063  *   colors are reversed.</para></listitem>
1064  * </varlistentry>
1065  * </variablelist>
1066  * Signed values, such as the %stylehint_Weight value, are cast to
1067  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1068  * in a more natural context.
1069  *
1070  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1071  */
1072 glui32
1073 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1074 {
1075 #ifdef DEBUG_STYLES
1076         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1077 #endif
1078
1079         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1080         GtkTextTag *tag;
1081
1082         switch(win->type) {
1083         case wintype_TextBuffer:
1084                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1085                 if(result)
1086                         *result = query_tag(tag, win->type, hint);
1087                 break;
1088         case wintype_TextGrid:
1089                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1090                 if(result)
1091                         *result = query_tag(tag, win->type, hint);
1092         default:
1093                 return FALSE;
1094         }
1095
1096         return TRUE;
1097 }
1098
1099 /* Internal function returning the current default font for a window type
1100  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1101  * supported for now */
1102 PangoFontDescription *
1103 get_current_font(guint32 wintype)
1104 {
1105         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1106         GtkTextTag *tag;
1107
1108         switch(wintype) {
1109         case wintype_TextGrid:
1110                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1111                 break;
1112         case wintype_TextBuffer:
1113                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1114                 break;
1115         default:
1116                 return NULL;
1117         }
1118
1119         PangoFontDescription *font;
1120         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1121
1122         return font;
1123 }
1124
1125 /* Internal function copying the attributes of a text tag to a pango attribute list */
1126 static void
1127 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1128 {
1129         gboolean set;
1130         GdkColor *foreground, *background;
1131         gchar *string;
1132         PangoFontDescription *font_desc;
1133         gboolean strikethrough;
1134         PangoUnderline underline;
1135
1136         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1137         if(set) {
1138                 pango_attr_list_insert(
1139                         list,
1140                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1141                 );
1142         }
1143         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1144         if(set) {
1145                 pango_attr_list_insert(
1146                         list,
1147                         pango_attr_background_new(background->red, background->green, background->blue)
1148                 );
1149         }
1150         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1151         if(set) {
1152                 pango_attr_list_insert(
1153                         list,
1154                         pango_attr_language_new( pango_language_from_string(string) )
1155                 );
1156         }
1157
1158         /* Font description updates the following properties simultaniously:
1159          * family, style, weight, variant, stretch, size
1160          */
1161         g_object_get(tag, "font-desc", &font_desc, NULL);
1162         pango_attr_list_insert(
1163                 list,
1164                 pango_attr_font_desc_new(font_desc)
1165         );
1166
1167         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1168         if(set) {
1169                 pango_attr_list_insert(
1170                         list,
1171                         pango_attr_strikethrough_new(strikethrough)
1172                 );
1173         }
1174         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1175         if(set) {
1176                 pango_attr_list_insert(
1177                         list,
1178                         pango_attr_underline_new(underline)
1179                 );
1180         }
1181 }
1182
1183 /* Update pager tag */
1184 void
1185 style_update(ChimaraGlk *glk)
1186 {
1187         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1188
1189         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1190         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1191 }
1192
1193 /* Determine the current colors used to render the text for a given stream.
1194  * This can be set in a number of places */
1195 static void
1196 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1197 {
1198         gboolean foreground_set = FALSE;
1199         gboolean background_set = FALSE;
1200         gint reverse_color;
1201
1202         // Default color
1203         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1204         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1205         if(foreground_set)
1206                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1207         if(background_set)
1208                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1209
1210         // Player defined color
1211         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1212         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1213         if(foreground_set)
1214                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1215         if(background_set)
1216                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1217
1218         // GLK defined color
1219         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1220         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1221         if(foreground_set)
1222                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1223         if(background_set)
1224                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1225
1226 }
1227
1228 /* Determine the current colors used to render the text for a given stream.
1229  * This can be set in a number of places */
1230 void
1231 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1232 {
1233         VALID_STREAM(str, return);
1234         g_return_if_fail(str->window != NULL);
1235         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1236
1237         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1238         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1239         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1240         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1241         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1242
1243         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1244
1245         gboolean foreground_set, background_set;
1246
1247         // Windows can have zcolors defined
1248         if(str->window->zcolor) {
1249                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1250                 if(foreground_set)
1251                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1252                 if(background_set)
1253                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1254         }
1255 }