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         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 393
 394         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 395                 if( !style_accept_style_selector(scanner, glk) )
 396                         break;
 397         }
 398
 399         g_scanner_destroy(scanner);
 400
 401         /* Update the pager prompt to the new style */
 402         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
 403         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 404 }
 405
 406 /* Internal function: parses a token */
 407 static gboolean
 408 style_accept(GScanner *scanner, GTokenType token)
 409 {
 410         GTokenType next = g_scanner_get_next_token(scanner);
 411         if(next != token) {
 412                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 413                 return FALSE;
 414         }
 415         return TRUE;
 416 }
 417
 418 /* Internal function: parses a style selector */
 419 static gboolean
 420 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 421 {
 422         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 423
 424         GtkTextTag *current_tag;
 425         gchar *field;
 426         GTokenType token = g_scanner_get_next_token(scanner);
 427         GTokenValue value = g_scanner_cur_value(scanner);
 428
 429         if(
 430                 token != G_TOKEN_IDENTIFIER ||
 431                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 432         ) {
 433                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 434                 return FALSE;
 435         }
 436
 437         field = g_strdup(value.v_identifier);
 438
 439         /* Parse the tag name to change */
 440         if( g_scanner_peek_next_token(scanner) == '{') {
 441                 style_accept(scanner, '{');
 442                 if( !strcmp(field, "buffer") )
 443                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 444                 else
 445                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 446         } else {
 447                 if( !style_accept(scanner, '.') )
 448                         return FALSE;
 449
 450                 token = g_scanner_get_next_token(scanner);
 451                 value = g_scanner_cur_value(scanner);
 452
 453                 if(token != G_TOKEN_IDENTIFIER) {
 454                         g_scanner_error(scanner, "CSS Error: style selector expected");
 455                         return FALSE;
 456                 }
 457
 458                 if( !strcmp(field, "buffer") )
 459                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 460                 else
 461                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 462
 463                 if(current_tag == NULL) {
 464                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 465                         return FALSE;
 466                 }
 467
 468                 if( !style_accept(scanner, '{') )
 469                         return FALSE;
 470         }
 471
 472         while( g_scanner_peek_next_token(scanner) != '}') {
 473                 if( !style_accept_style_hint(scanner, current_tag) )
 474                         return FALSE;
 475         }
 476
 477         if( !style_accept(scanner, '}') )
 478                 return FALSE;
 479
 480         return TRUE;
 481 }
 482
 483 /* Internal function: parses a style hint */
 484 static gboolean
 485 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 486 {
 487         GTokenType token = g_scanner_get_next_token(scanner);
 488         GTokenValue value = g_scanner_cur_value(scanner);
 489         gchar *hint;
 490
 491         if(token != G_TOKEN_IDENTIFIER) {
 492                 g_scanner_error(scanner, "CSS Error: style hint expected");
 493                 return FALSE;
 494         }
 495
 496         hint = g_strdup(value.v_identifier);
 497
 498         if( !style_accept(scanner, ':') )
 499                 return FALSE;
 500
 501         token = g_scanner_get_next_token(scanner);
 502         value = g_scanner_cur_value(scanner);
 503
 504         if( !strcmp(hint, "font-family") ) {
 505                 if(token != G_TOKEN_STRING) {
 506                         g_scanner_error(scanner, "CSS Error: string expected");
 507                         return FALSE;
 508                 }
 509                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 510         }
 511         else if( !strcmp(hint, "font-weight") ) {
 512                 if(token != G_TOKEN_IDENTIFIER) {
 513                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 514                         return FALSE;
 515                 }
 516
 517                 if( !strcmp(value.v_identifier, "bold") )
 518                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 519                 else if( !strcmp(value.v_identifier, "normal") )
 520                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 521                 else {
 522                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 523                         return FALSE;
 524                 }
 525         }
 526         else if( !strcmp(hint, "font-style") ) {
 527                 if(token != G_TOKEN_IDENTIFIER) {
 528                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 529                         return FALSE;
 530                 }
 531
 532                 if( !strcmp(value.v_identifier, "italic") )
 533                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 534                 else if( !strcmp(value.v_identifier, "normal") )
 535                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 536                 else {
 537                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 538                         return FALSE;
 539                 }
 540         }
 541         else if( !strcmp(hint, "font-size") ) {
 542                 if(token == G_TOKEN_INT)
 543                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 544                 else if(token == G_TOKEN_FLOAT)
 545                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 546                 else {
 547                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 548                         return FALSE;
 549                 }
 550         }
 551         else if( !strcmp(hint, "color") ) {
 552                 if(token != G_TOKEN_IDENTIFIER) {
 553                         g_scanner_error(scanner, "CSS Error: hex color expected");
 554                         return FALSE;
 555                 }
 556
 557                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 558         }
 559         else if( !strcmp(hint, "background-color") ) {
 560                 if(token != G_TOKEN_IDENTIFIER) {
 561                         g_scanner_error(scanner, "CSS Error: hex color expected");
 562                         return FALSE;
 563                 }
 564                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 565         }
 566         else if( !strcmp(hint, "text-align") ) {
 567                 if(token != G_TOKEN_IDENTIFIER) {
 568                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 569                         return FALSE;
 570                 }
 571
 572                 if( !strcmp(value.v_identifier, "left") )
 573                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 574                 else if( !strcmp(value.v_identifier, "right") )
 575                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 576                 else if( !strcmp(value.v_identifier, "center") )
 577                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 578                 else {
 579                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 580                         return FALSE;
 581                 }
 582         }
 583         else if( !strcmp(hint, "margin-left") ) {
 584                 if(token != G_TOKEN_INT) {
 585                         g_scanner_error(scanner, "CSS Error: integer expected");
 586                         return FALSE;
 587                 }
 588                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 589         }
 590         else if( !strcmp(hint, "margin-right") ) {
 591                 if(token != G_TOKEN_INT) {
 592                         g_scanner_error(scanner, "CSS Error: integer expected");
 593                         return FALSE;
 594                 }
 595                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 596         }
 597         else if( !strcmp(hint, "margin-top") ) {
 598                 if(token != G_TOKEN_INT) {
 599                         g_scanner_error(scanner, "CSS Error: integer expected");
 600                         return FALSE;
 601                 }
 602                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 603         }
 604         else if( !strcmp(hint, "margin-bottom") ) {
 605                 if(token != G_TOKEN_INT) {
 606                         g_scanner_error(scanner, "CSS Error: integer expected");
 607                         return FALSE;
 608                 }
 609                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 610         }
 611
 612         else {
 613                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 614                 return FALSE;
 615         }
 616
 617         if( !style_accept(scanner, ';') )
 618                 return FALSE;
 619
 620         return TRUE;
 621 }
 622
 623 /* Internal function: parses a glk color to a GdkColor */
 624 void
 625 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 626 {
 627         color->red = 256 * ((val & 0xff0000) >> 16);
 628         color->green = 256 * ((val & 0x00ff00) >> 8);
 629         color->blue = 256 * (val & 0x0000ff);
 630 }
 631
 632 /* Internal function: parses a glk color to a hex string */
 633 gchar*
 634 glkcolor_to_hex(glui32 val)
 635 {
 636         return g_strdup_printf("%04X%04X%04X",
 637                 256 * ((val & 0xff0000) >> 16),
 638                 256 * ((val & 0x00ff00) >> 8),
 639                 256 * (val & 0x0000ff)
 640         );
 641 }
 642
 643 /* Internal function: parses a gdk color to a hex string */
 644 gchar*
 645 gdkcolor_to_hex(GdkColor *color)
 646 {
 647         return g_strdup_printf("%04X%04X%04X",
 648                 color->red, color->green, color->blue
 649         );
 650 }
 651
 652 /* Internal function: parses a GdkColor to a glk color */
 653 static glui32
 654 gdkcolor_to_glkcolor(GdkColor *color)
 655 {
 656         g_return_val_if_fail(color != NULL, 0);
 657         return (glui32) color->pixel;
 658 }
 659
 660 /* Internal function: changes a GTK tag to correspond with the given style. */
 661 static void
 662 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 663 {
 664         g_return_if_fail(tag != NULL);
 665
 666         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 667         GObject *tag_object = G_OBJECT(tag);
 668
 669         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 670
 671         int i = 0;
 672         GdkColor color;
 673         switch(hint) {
 674         case stylehint_Indentation:
 675                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 676                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 677                 break;
 678
 679         case stylehint_ParaIndentation:
 680                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 681                 break;
 682
 683         case stylehint_Justification:
 684                 switch(val) {
 685                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 686                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 687                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 688                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 689                         default:
 690                                 WARNING("Unknown justification");
 691                                 i = GTK_JUSTIFY_LEFT;
 692                 }
 693                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 694                 break;
 695
 696         case stylehint_Weight:
 697                 switch(val) {
 698                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 699                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 700                         case  1: i = PANGO_WEIGHT_BOLD; break;
 701                         default: WARNING("Unknown font weight");
 702                 }
 703                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 704                 break;
 705
 706         case stylehint_Size:
 707                 {
 708                         gdouble scale = PANGO_SCALE_MEDIUM;
 709                         switch(val) {
 710                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 711                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 712                                 case -1: scale = PANGO_SCALE_SMALL; break;
 713                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 714                                 case  1: scale = PANGO_SCALE_LARGE; break;
 715                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 716                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 717                                 default:
 718                                         /* We follow Pango's convention of having each magnification
 719                                         step be a scaling of 1.2 */
 720                                         scale = pow(1.2, (double)val);
 721                         }
 722                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 723                 }
 724                 break;
 725
 726         case stylehint_Oblique:
 727                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 728                 break;
 729
 730         case stylehint_Proportional:
 731         {
 732                 gchar *font_family;
 733                 gboolean family_set;
 734
 735                 if(wintype != wintype_TextBuffer) {
 736                         if(val)
 737                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 738
 739                         break;
 740                 }
 741
 742                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 743                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 744                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 745                 g_free(font_family);
 746         }
 747                 break;
 748
 749         case stylehint_TextColor:
 750                 glkcolor_to_gdkcolor(val, &color);
 751
 752                 if(!reverse_color)
 753                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 754                 else
 755                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 756
 757                 break;
 758
 759         case stylehint_BackColor:
 760                 glkcolor_to_gdkcolor(val, &color);
 761
 762                 if(!reverse_color)
 763                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 764                 else
 765                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 766
 767                 break;
 768
 769         case stylehint_ReverseColor:
 770         {
 771                 // Determine the current colors
 772
 773                 // If all fails, use black/white
 774                 // FIXME: Use system theme here
 775                 GdkColor foreground, background;
 776                 gdk_color_parse("black", &foreground);
 777                 gdk_color_parse("white", &background);
 778                 GdkColor *current_foreground = &foreground;
 779                 GdkColor *current_background = &background;
 780
 781                 if(wintype == wintype_TextBuffer) {
 782                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 783                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 784                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 785                 }
 786                 else if(wintype == wintype_TextGrid) {
 787                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 788                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 789                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 790                 }
 791
 792                 if(val) {
 793                         /* Flip the fore- and background colors */
 794                         GdkColor *temp = current_foreground;
 795                         current_foreground = current_background;
 796                         current_background = temp;
 797                 }
 798
 799                 g_object_set(tag,
 800                         "foreground-gdk", current_foreground,
 801                         "foreground-set", TRUE,
 802                         "background-gdk", current_background,
 803                         "background-set", TRUE,
 804                         NULL
 805                 );
 806
 807                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 808                 break;
 809         }
 810
 811         default:
 812                 WARNING("Unknown style hint");
 813         }
 814 }
 815
 816 /* Internal function: queries a text tag for the value of a given style hint */
 817 static gint
 818 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 819 {
 820         gint intval;
 821         gdouble doubleval;
 822         GdkColor *colval;
 823
 824         g_return_val_if_fail(tag != NULL, 0);
 825
 826         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 827
 828         switch(hint) {
 829         case stylehint_Indentation:
 830                 g_object_get(tag, "left_margin", &intval, NULL);
 831                 return intval/5;
 832
 833         case stylehint_ParaIndentation:
 834                 g_object_get(tag, "indent", &intval, NULL);
 835                 return intval/5;
 836
 837         case stylehint_Justification:
 838                 g_object_get(tag, "justification", &intval, NULL);
 839                 switch(intval) {
 840                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 841                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 842                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 843                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 844                         default:
 845                                 WARNING("Unknown justification");
 846                                 return stylehint_just_LeftFlush;
 847                 }
 848
 849         case stylehint_Weight:
 850                 g_object_get(tag, "weight", &intval, NULL);
 851                 switch(intval) {
 852                         case PANGO_WEIGHT_LIGHT: return -1;
 853                         case PANGO_WEIGHT_NORMAL: return 0;
 854                         case PANGO_WEIGHT_BOLD: return 1;
 855                         default: WARNING("Unknown font weight"); return 0;
 856                 }
 857
 858         case stylehint_Size:
 859                 g_object_get(tag, "scale", &doubleval, NULL);
 860                 return (gint)round(log(doubleval) / log(1.2));
 861
 862         case stylehint_Oblique:
 863                 g_object_get(tag, "style", &intval , NULL);
 864                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 865
 866         case stylehint_Proportional:
 867                 /* Use pango_font_family_is_monospace()? */
 868         {
 869                 gchar *font_family, *query_font_family;
 870                 GtkTextTag *font_tag = g_hash_table_lookup(
 871                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 872                     "preformatted");
 873                 g_object_get(font_tag, "family", &font_family, NULL);
 874                 g_object_get(tag, "family", &query_font_family, NULL);
 875                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 876                 g_free(font_family);
 877                 g_free(query_font_family);
 878                 return retval;
 879         }
 880
 881         case stylehint_TextColor:
 882                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 883                 return gdkcolor_to_glkcolor(colval);
 884
 885         case stylehint_BackColor:
 886                 g_object_get(tag, "background-gdk", &colval, NULL);
 887                 return gdkcolor_to_glkcolor(colval);
 888
 889         case stylehint_ReverseColor:
 890                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 891
 892         default:
 893                 WARNING("Unknown style hint");
 894         }
 895
 896         return 0;
 897 }
 898
 899 /**
 900  * glk_stylehint_set:
 901  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 902  * @styl: The style to set a hint for.
 903  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 904  * @val: The style hint. The meaning of this depends on @hint.
 905  *
 906  * Sets a hint about the appearance of one style for a particular type of
 907  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 908  * all types of window.
 909  * <note><para>
 910  *  There is no equivalent constant to set a hint for all styles of a single
 911  *  window type.
 912  * </para></note>
 913  */
 914 void
 915 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 916 {
 917 #ifdef DEBUG_STYLES
 918         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 919 #endif
 920
 921         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 922
 923         GtkTextTag *to_change;
 924         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 925                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 926                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 927         }
 928
 929         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 930                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 931                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 932         }
 933 }
 934
 935 /**
 936  * glk_stylehint_clear:
 937  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 938  * @styl: The style to set a hint for.
 939  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 940  *
 941  * Clears a hint about the appearance of one style for a particular type of
 942  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 943  * which clears a hint for all types of window.
 944  * <note><para>
 945  *  There is no equivalent constant to reset a hint for all styles of a single
 946  *  window type.
 947  * </para></note>
 948  */
 949 void
 950 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 951 {
 952 #ifdef DEBUG_STYLES
 953         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 954 #endif
 955
 956         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 957         GtkTextTag *tag;
 958
 959         switch(wintype) {
 960         case wintype_TextBuffer:
 961                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 962                 if(tag) {
 963                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 964                 }
 965                 break;
 966         case wintype_TextGrid:
 967                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 968                 if(tag) {
 969                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 970                 }
 971         default:
 972                 return;
 973         }
 974 }
 975
 976 /**
 977  * glk_style_distinguish:
 978  * @win: The window in which the styles are to be distinguished.
 979  * @styl1: The first style to be distinguished from the second style.
 980  * @styl2: The second style to be distinguished from the first style.
 981  *
 982  * Decides whether two styles are visually distinguishable in the given window.
 983  * The exact meaning of this is left for the library to determine.
 984  * <note><title>Chimara</title><para>
 985  *   Currently, all styles of one window are assumed to be mutually
 986  *   distinguishable.
 987  * </para></note>
 988  *
 989  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
 990  * are not, it returns %FALSE (0).
 991  */
 992 glui32
 993 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 994 {
 995 #ifdef DEBUG_STYLES
 996         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
 997 #endif
 998
 999         /* FIXME */
1000         return styl1 != styl2;
1001 }
1002
1003 /**
1004  * glk_style_measure:
1005  * @win: The window from which to take the style.
1006  * @styl: The style to perform the measurement on.
1007  * @hint: The stylehint to measure.
1008  * @result: Address to write the result to.
1009  *
1010  * Tries to test an attribute of one style in the given window @win. The library
1011  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1012  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1013  * at by @result.
1014  * <note><para>
1015  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1016  * </para></note>
1017  *
1018  * The meaning of the value depends on the hint which was tested:
1019  * <variablelist>
1020  * <varlistentry>
1021  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1022  *   <listitem><para>The indentation and paragraph indentation. These are in a
1023  *   metric which is platform-dependent.</para>
1024  *   <note><para>Most likely either characters or pixels.</para></note>
1025  *   </listitem>
1026  * </varlistentry>
1027  * <varlistentry>
1028  *   <term>%stylehint_Justification</term>
1029  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1030  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1031  *   %stylehint_just_RightFlush.</para></listitem>
1032  * </varlistentry>
1033  * <varlistentry>
1034  *   <term>%stylehint_Size</term>
1035  *   <listitem><para>The font size. Again, this is in a platform-dependent
1036  *   metric.</para>
1037  *   <note><para>Pixels, points, or simply 1 if the library does not support
1038  *   varying font sizes.</para></note>
1039  *   </listitem>
1040  * </varlistentry>
1041  * <varlistentry>
1042  *   <term>%stylehint_Weight</term>
1043  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1044  *   and -1 for light-weight fonts.</para></listitem>
1045  * </varlistentry>
1046  * <varlistentry>
1047  *   <term>%stylehint_Oblique</term>
1048  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1049  *   </listitem>
1050  * </varlistentry>
1051  * <varlistentry>
1052  *   <term>%stylehint_Proportional</term>
1053  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1054  *   </para></listitem>
1055  * </varlistentry>
1056  * <varlistentry>
1057  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1058  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1059  *   described in <link
1060  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1061  *   Appearance of Styles</link>.</para></listitem>
1062  * </varlistentry>
1063  * <varlistentry>
1064  *   <term>%stylehint_ReverseColor</term>
1065  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1066  *   colors are reversed.</para></listitem>
1067  * </varlistentry>
1068  * </variablelist>
1069  * Signed values, such as the %stylehint_Weight value, are cast to
1070  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1071  * in a more natural context.
1072  *
1073  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1074  */
1075 glui32
1076 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1077 {
1078 #ifdef DEBUG_STYLES
1079         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1080 #endif
1081
1082         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1083         GtkTextTag *tag;
1084
1085         switch(win->type) {
1086         case wintype_TextBuffer:
1087                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1088                 if(result)
1089                         *result = query_tag(tag, win->type, hint);
1090                 break;
1091         case wintype_TextGrid:
1092                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1093                 if(result)
1094                         *result = query_tag(tag, win->type, hint);
1095         default:
1096                 return FALSE;
1097         }
1098
1099         return TRUE;
1100 }
1101
1102 /* Internal function returning the current default font for a window type
1103  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1104  * supported for now */
1105 PangoFontDescription *
1106 get_current_font(guint32 wintype)
1107 {
1108         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
1109         GtkTextTag *tag;
1110
1111         switch(wintype) {
1112         case wintype_TextGrid:
1113                 tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
1114                 break;
1115         case wintype_TextBuffer:
1116                 tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
1117                 break;
1118         default:
1119                 return NULL;
1120         }
1121
1122         PangoFontDescription *font;
1123         g_object_get( G_OBJECT(tag), "font-desc", &font, NULL );
1124
1125         return font;
1126 }
1127
1128 /* Internal function copying the attributes of a text tag to a pango attribute list */
1129 static void
1130 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1131 {
1132         gboolean set;
1133         GdkColor *foreground, *background;
1134         gchar *string;
1135         PangoFontDescription *font_desc;
1136         gboolean strikethrough;
1137         PangoUnderline underline;
1138
1139         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1140         if(set) {
1141                 pango_attr_list_insert(
1142                         list,
1143                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1144                 );
1145         }
1146         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1147         if(set) {
1148                 pango_attr_list_insert(
1149                         list,
1150                         pango_attr_background_new(background->red, background->green, background->blue)
1151                 );
1152         }
1153         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1154         if(set) {
1155                 pango_attr_list_insert(
1156                         list,
1157                         pango_attr_language_new( pango_language_from_string(string) )
1158                 );
1159         }
1160
1161         /* Font description updates the following properties simultaniously:
1162          * family, style, weight, variant, stretch, size
1163          */
1164         g_object_get(tag, "font-desc", &font_desc, NULL);
1165         pango_attr_list_insert(
1166                 list,
1167                 pango_attr_font_desc_new(font_desc)
1168         );
1169
1170         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1171         if(set) {
1172                 pango_attr_list_insert(
1173                         list,
1174                         pango_attr_strikethrough_new(strikethrough)
1175                 );
1176         }
1177         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1178         if(set) {
1179                 pango_attr_list_insert(
1180                         list,
1181                         pango_attr_underline_new(underline)
1182                 );
1183         }
1184 }
1185
1186 /* Update pager tag */
1187 void
1188 style_update(ChimaraGlk *glk)
1189 {
1190         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1191
1192         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1193         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
1194 }
1195
1196 /* Determine the current colors used to render the text for a given stream.
1197  * This can be set in a number of places */
1198 static void
1199 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1200 {
1201         gboolean foreground_set = FALSE;
1202         gboolean background_set = FALSE;
1203         gint reverse_color;
1204
1205         // Default color
1206         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1207         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1208         if(foreground_set)
1209                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1210         if(background_set)
1211                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1212
1213         // Player defined color
1214         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1215         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1216         if(foreground_set)
1217                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1218         if(background_set)
1219                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1220
1221         // GLK defined color
1222         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1223         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1224         if(foreground_set)
1225                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1226         if(background_set)
1227                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1228
1229 }
1230
1231 /* Determine the current colors used to render the text for a given stream.
1232  * This can be set in a number of places */
1233 void
1234 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1235 {
1236         VALID_STREAM(str, return);
1237         g_return_if_fail(str->window != NULL);
1238         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1239
1240         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1241         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1242         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1243         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1244         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1245
1246         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1247
1248         gboolean foreground_set, background_set;
1249
1250         // Windows can have zcolors defined
1251         if(str->window->zcolor) {
1252                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1253                 if(foreground_set)
1254                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1255                 if(background_set)
1256                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1257         }
1258 }