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         char *tag_name;
 190         GParamSpec **properties;
 191         unsigned nprops, count;
 192
 193         g_return_val_if_fail(tag != NULL, NULL);
 194
 195         g_object_get(tag, "name", &tag_name, NULL);
 196         copy = gtk_text_tag_new(tag_name);
 197         g_free(tag_name);
 198
 199         /* Copy all the original tag's properties to the new tag */
 200         properties = g_object_class_list_properties( G_OBJECT_GET_CLASS(tag), &nprops );
 201         for(count = 0; count < nprops; count++) {
 202
 203                 /* Only copy properties that are readable, writable, not construct-only,
 204                 and not deprecated */
 205                 GParamFlags flags = properties[count]->flags;
 206                 if(flags & G_PARAM_CONSTRUCT_ONLY
 207                         || flags & G_PARAM_DEPRECATED
 208                         || !(flags & G_PARAM_READABLE)
 209                         || !(flags & G_PARAM_WRITABLE))
 210                         continue;
 211
 212                 const char *prop_name = g_param_spec_get_name(properties[count]);
 213                 GValue prop_value = G_VALUE_INIT;
 214
 215                 g_value_init( &prop_value, G_PARAM_SPEC_VALUE_TYPE(properties[count]) );
 216                 g_object_get_property( G_OBJECT(tag), prop_name, &prop_value );
 217                 /* Don't copy the PangoTabArray if it is NULL, that prints a warning */
 218                 if(strcmp(prop_name, "tabs") == 0 && g_value_get_boxed(&prop_value) == NULL) {
 219                         g_value_unset(&prop_value);
 220                         continue;
 221                 }
 222                 g_object_set_property( G_OBJECT(copy), prop_name, &prop_value );
 223                 g_value_unset(&prop_value);
 224         }
 225         g_free(properties);
 226
 227         /* Copy the data that was added manually */
 228         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse-color" );
 229
 230         if(reverse_color) {
 231                 g_object_set_data( G_OBJECT(copy), "reverse-color", reverse_color );
 232         }
 233
 234         return copy;
 235 }
 236
 237 /* Internal function that constructs the default styles */
 238 void
 239 style_init(ChimaraGlk *glk)
 240 {
 241         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 242
 243         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 244         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 245         GtkTextTag *tag;
 246
 247         /* Initialise the default styles for a text grid */
 248         tag = gtk_text_tag_new("default");
 249         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 250         g_hash_table_insert(default_text_grid_styles, "default", tag);
 251
 252         tag = gtk_text_tag_new("normal");
 253         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 254
 255         tag = gtk_text_tag_new("emphasized");
 256         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 257         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 258
 259         tag = gtk_text_tag_new("preformatted");
 260         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 261
 262         tag = gtk_text_tag_new("header");
 263         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 264         g_hash_table_insert(default_text_grid_styles, "header", tag);
 265
 266         tag = gtk_text_tag_new("subheader");
 267         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 268         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 269
 270         tag = gtk_text_tag_new("alert");
 271         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 272         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 273
 274         tag = gtk_text_tag_new("note");
 275         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 276         g_hash_table_insert(default_text_grid_styles, "note", tag);
 277
 278         tag = gtk_text_tag_new("block-quote");
 279         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 280         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 281
 282         tag = gtk_text_tag_new("input");
 283         g_hash_table_insert(default_text_grid_styles, "input", tag);
 284
 285         tag = gtk_text_tag_new("user1");
 286         g_hash_table_insert(default_text_grid_styles, "user1", tag);
 287
 288         tag = gtk_text_tag_new("user2");
 289         g_hash_table_insert(default_text_grid_styles, "user2", tag);
 290
 291         tag = gtk_text_tag_new("hyperlink");
 292         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 293         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 294
 295         /* Initialise the default styles for a text buffer */
 296         tag = gtk_text_tag_new("default");
 297         g_object_set(tag, "family", "Serif", "family-set", TRUE, NULL);
 298         g_hash_table_insert(default_text_buffer_styles, "default", tag);
 299
 300         tag = gtk_text_tag_new("normal");
 301         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 302
 303         tag = gtk_text_tag_new("emphasized");
 304         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 305         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 306
 307         tag = gtk_text_tag_new("preformatted");
 308         g_object_set(tag, "family", "Monospace", "family-set", TRUE, NULL);
 309         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 310
 311         tag = gtk_text_tag_new("header");
 312         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 313         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 314
 315         tag = gtk_text_tag_new("subheader");
 316         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 317         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 318
 319         tag = gtk_text_tag_new("alert");
 320         g_object_set(tag, "foreground", "#aa0000", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 321         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 322
 323         tag = gtk_text_tag_new("note");
 324         g_object_set(tag, "foreground", "#aaaa00", "foreground-set", TRUE, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 325         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 326
 327         tag = gtk_text_tag_new("block-quote");
 328         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 329         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 330
 331         tag = gtk_text_tag_new("input");
 332         g_hash_table_insert(default_text_buffer_styles, "input", tag);
 333
 334         tag = gtk_text_tag_new("user1");
 335         g_hash_table_insert(default_text_buffer_styles, "user1", tag);
 336
 337         tag = gtk_text_tag_new("user2");
 338         g_hash_table_insert(default_text_buffer_styles, "user2", tag);
 339
 340         tag = gtk_text_tag_new("hyperlink");
 341         g_object_set(tag, "foreground", "#0000ff", "foreground-set", TRUE, "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 342         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 343
 344         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 345         g_object_set(pager_tag, "family", "Monospace", "family-set", TRUE, "foreground", "#ffffff", "foreground-set", TRUE, "background", "#000000", "background-set", TRUE, NULL);
 346         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 347         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
 348
 349         priv->styles->text_grid = default_text_grid_styles;
 350         priv->styles->text_buffer = default_text_buffer_styles;
 351
 352         style_reset_glk(glk);
 353 }
 354
 355 /* Reset the style hints set from the Glk program to be blank. Call this when
 356 starting a new game so that style hints from the previous game don't carry
 357 over. */
 358 void
 359 style_reset_glk(ChimaraGlk *glk)
 360 {
 361         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 362
 363         GHashTable *glk_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 364         GHashTable *glk_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 365         GtkTextTag *tag;
 366
 367         /* Initialize the GLK styles to empty tags */
 368         int i;
 369         for(i=0; i<style_NUMSTYLES; i++) {
 370                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 371                 g_hash_table_insert(glk_text_grid_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 372                 tag = gtk_text_tag_new(GLK_TAG_NAMES[i]);
 373                 g_hash_table_insert(glk_text_buffer_styles, (gchar*) GLK_TAG_NAMES[i], tag);
 374         }
 375
 376         priv->glk_styles->text_grid = glk_text_grid_styles;
 377         priv->glk_styles->text_buffer = glk_text_buffer_styles;
 378
 379 }
 380
 381 /* Reset style tables to the library's internal defaults */
 382 void
 383 reset_default_styles(ChimaraGlk *glk)
 384 {
 385         /* TODO: write this function */
 386 }
 387
 388 /* Create the CSS file scanner */
 389 GScanner *
 390 create_css_file_scanner(void)
 391 {
 392         GScanner *scanner = g_scanner_new(NULL);
 393         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 394         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 395         scanner->config->symbol_2_token = TRUE;
 396         scanner->config->cpair_comment_single = NULL;
 397         scanner->config->scan_float = FALSE;
 398         return scanner;
 399 }
 400
 401 /* Run the scanner over the CSS file, overriding the default styles */
 402 void
 403 scan_css_file(GScanner *scanner, ChimaraGlk *glk)
 404 {
 405         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 406                 if( !style_accept_style_selector(scanner, glk) )
 407                         break;
 408         }
 409
 410         g_scanner_destroy(scanner);
 411
 412         /* Update the pager prompt to the new style */
 413         style_update(glk);
 414 }
 415
 416 /* Internal function: parses a token */
 417 static gboolean
 418 style_accept(GScanner *scanner, GTokenType token)
 419 {
 420         GTokenType next = g_scanner_get_next_token(scanner);
 421         if(next != token) {
 422                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 423                 return FALSE;
 424         }
 425         return TRUE;
 426 }
 427
 428 /* Internal function: parses a style selector */
 429 static gboolean
 430 style_accept_style_selector(GScanner *scanner, ChimaraGlk *glk)
 431 {
 432         CHIMARA_GLK_USE_PRIVATE(glk, priv);
 433
 434         GtkTextTag *current_tag;
 435         gchar *field;
 436         GTokenType token = g_scanner_get_next_token(scanner);
 437         GTokenValue value = g_scanner_cur_value(scanner);
 438
 439         if(
 440                 token != G_TOKEN_IDENTIFIER ||
 441                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 442         ) {
 443                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 444                 return FALSE;
 445         }
 446
 447         field = g_strdup(value.v_identifier);
 448
 449         /* Parse the tag name to change */
 450         if( g_scanner_peek_next_token(scanner) == '{') {
 451                 style_accept(scanner, '{');
 452                 if( !strcmp(field, "buffer") )
 453                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, "default");
 454                 else
 455                         current_tag = g_hash_table_lookup(priv->styles->text_grid, "default");
 456         } else {
 457                 if( !style_accept(scanner, '.') )
 458                         return FALSE;
 459
 460                 token = g_scanner_get_next_token(scanner);
 461                 value = g_scanner_cur_value(scanner);
 462
 463                 if(token != G_TOKEN_IDENTIFIER) {
 464                         g_scanner_error(scanner, "CSS Error: style selector expected");
 465                         return FALSE;
 466                 }
 467
 468                 if( !strcmp(field, "buffer") )
 469                         current_tag = g_hash_table_lookup(priv->styles->text_buffer, value.v_identifier);
 470                 else
 471                         current_tag = g_hash_table_lookup(priv->styles->text_grid, value.v_identifier);
 472
 473                 if(current_tag == NULL) {
 474                         g_scanner_error(scanner, "CSS Error: invalid style identifier");
 475                         return FALSE;
 476                 }
 477
 478                 if( !style_accept(scanner, '{') )
 479                         return FALSE;
 480         }
 481
 482         while( g_scanner_peek_next_token(scanner) != '}') {
 483                 if( !style_accept_style_hint(scanner, current_tag) )
 484                         return FALSE;
 485         }
 486
 487         if( !style_accept(scanner, '}') )
 488                 return FALSE;
 489
 490         return TRUE;
 491 }
 492
 493 /* Internal function: parses a style hint */
 494 static gboolean
 495 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 496 {
 497         GTokenType token = g_scanner_get_next_token(scanner);
 498         GTokenValue value = g_scanner_cur_value(scanner);
 499         gchar *hint;
 500
 501         if(token != G_TOKEN_IDENTIFIER) {
 502                 g_scanner_error(scanner, "CSS Error: style hint expected");
 503                 return FALSE;
 504         }
 505
 506         hint = g_strdup(value.v_identifier);
 507
 508         if( !style_accept(scanner, ':') )
 509                 return FALSE;
 510
 511         token = g_scanner_get_next_token(scanner);
 512         value = g_scanner_cur_value(scanner);
 513
 514         if( !strcmp(hint, "font-family") ) {
 515                 if(token != G_TOKEN_STRING) {
 516                         g_scanner_error(scanner, "CSS Error: string expected");
 517                         return FALSE;
 518                 }
 519                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 520         }
 521         else if( !strcmp(hint, "font-weight") ) {
 522                 if(token != G_TOKEN_IDENTIFIER) {
 523                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 524                         return FALSE;
 525                 }
 526
 527                 if( !strcmp(value.v_identifier, "bold") )
 528                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 529                 else if( !strcmp(value.v_identifier, "normal") )
 530                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 531                 else {
 532                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 533                         return FALSE;
 534                 }
 535         }
 536         else if( !strcmp(hint, "font-style") ) {
 537                 if(token != G_TOKEN_IDENTIFIER) {
 538                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 539                         return FALSE;
 540                 }
 541
 542                 if( !strcmp(value.v_identifier, "italic") )
 543                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 544                 else if( !strcmp(value.v_identifier, "normal") )
 545                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 546                 else {
 547                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 548                         return FALSE;
 549                 }
 550         }
 551         else if( !strcmp(hint, "font-size") ) {
 552                 if(token == G_TOKEN_INT)
 553                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 554                 else if(token == G_TOKEN_FLOAT)
 555                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 556                 else {
 557                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 558                         return FALSE;
 559                 }
 560         }
 561         else if( !strcmp(hint, "color") ) {
 562                 if(token != G_TOKEN_IDENTIFIER) {
 563                         g_scanner_error(scanner, "CSS Error: hex color expected");
 564                         return FALSE;
 565                 }
 566
 567                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 568         }
 569         else if( !strcmp(hint, "background-color") ) {
 570                 if(token != G_TOKEN_IDENTIFIER) {
 571                         g_scanner_error(scanner, "CSS Error: hex color expected");
 572                         return FALSE;
 573                 }
 574                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 575         }
 576         else if( !strcmp(hint, "text-align") ) {
 577                 if(token != G_TOKEN_IDENTIFIER) {
 578                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 579                         return FALSE;
 580                 }
 581
 582                 if( !strcmp(value.v_identifier, "left") )
 583                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 584                 else if( !strcmp(value.v_identifier, "right") )
 585                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 586                 else if( !strcmp(value.v_identifier, "center") )
 587                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 588                 else {
 589                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 590                         return FALSE;
 591                 }
 592         }
 593         else if( !strcmp(hint, "margin-left") ) {
 594                 if(token != G_TOKEN_INT) {
 595                         g_scanner_error(scanner, "CSS Error: integer expected");
 596                         return FALSE;
 597                 }
 598                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 599         }
 600         else if( !strcmp(hint, "margin-right") ) {
 601                 if(token != G_TOKEN_INT) {
 602                         g_scanner_error(scanner, "CSS Error: integer expected");
 603                         return FALSE;
 604                 }
 605                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 606         }
 607         else if( !strcmp(hint, "margin-top") ) {
 608                 if(token != G_TOKEN_INT) {
 609                         g_scanner_error(scanner, "CSS Error: integer expected");
 610                         return FALSE;
 611                 }
 612                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 613         }
 614         else if( !strcmp(hint, "margin-bottom") ) {
 615                 if(token != G_TOKEN_INT) {
 616                         g_scanner_error(scanner, "CSS Error: integer expected");
 617                         return FALSE;
 618                 }
 619                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 620         }
 621
 622         else {
 623                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 624                 return FALSE;
 625         }
 626
 627         if( !style_accept(scanner, ';') )
 628                 return FALSE;
 629
 630         return TRUE;
 631 }
 632
 633 /* Internal function: parses a glk color to a GdkColor */
 634 void
 635 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 636 {
 637         color->red = 256 * ((val & 0xff0000) >> 16);
 638         color->green = 256 * ((val & 0x00ff00) >> 8);
 639         color->blue = 256 * (val & 0x0000ff);
 640 }
 641
 642 /* Internal function: parses a glk color to a hex string */
 643 gchar*
 644 glkcolor_to_hex(glui32 val)
 645 {
 646         return g_strdup_printf("%04X%04X%04X",
 647                 256 * ((val & 0xff0000) >> 16),
 648                 256 * ((val & 0x00ff00) >> 8),
 649                 256 * (val & 0x0000ff)
 650         );
 651 }
 652
 653 /* Internal function: parses a gdk color to a hex string */
 654 gchar*
 655 gdkcolor_to_hex(GdkColor *color)
 656 {
 657         return g_strdup_printf("%04X%04X%04X",
 658                 color->red, color->green, color->blue
 659         );
 660 }
 661
 662 /* Internal function: parses a GdkColor to a glk color */
 663 static glui32
 664 gdkcolor_to_glkcolor(GdkColor *color)
 665 {
 666         g_return_val_if_fail(color != NULL, 0);
 667         return (glui32) color->pixel;
 668 }
 669
 670 /* Internal function: changes a GTK tag to correspond with the given style. */
 671 static void
 672 apply_stylehint_to_tag(GtkTextTag *tag, glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 673 {
 674         g_return_if_fail(tag != NULL);
 675
 676         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 677         GObject *tag_object = G_OBJECT(tag);
 678
 679         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 680
 681         int i = 0;
 682         GdkColor color;
 683         switch(hint) {
 684         case stylehint_Indentation:
 685                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 686                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 687                 break;
 688
 689         case stylehint_ParaIndentation:
 690                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 691                 break;
 692
 693         case stylehint_Justification:
 694                 switch(val) {
 695                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 696                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 697                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 698                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 699                         default:
 700                                 WARNING("Unknown justification");
 701                                 i = GTK_JUSTIFY_LEFT;
 702                 }
 703                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 704                 break;
 705
 706         case stylehint_Weight:
 707                 switch(val) {
 708                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 709                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 710                         case  1: i = PANGO_WEIGHT_BOLD; break;
 711                         default: WARNING("Unknown font weight");
 712                 }
 713                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 714                 break;
 715
 716         case stylehint_Size:
 717                 {
 718                         gdouble scale = PANGO_SCALE_MEDIUM;
 719                         switch(val) {
 720                                 case -3: scale = PANGO_SCALE_XX_SMALL; break;
 721                                 case -2: scale = PANGO_SCALE_X_SMALL; break;
 722                                 case -1: scale = PANGO_SCALE_SMALL; break;
 723                                 case  0: scale = PANGO_SCALE_MEDIUM; break;
 724                                 case  1: scale = PANGO_SCALE_LARGE; break;
 725                                 case  2: scale = PANGO_SCALE_X_LARGE; break;
 726                                 case  3: scale = PANGO_SCALE_XX_LARGE; break;
 727                                 default:
 728                                         /* We follow Pango's convention of having each magnification
 729                                         step be a scaling of 1.2 */
 730                                         scale = pow(1.2, (double)val);
 731                         }
 732                         g_object_set(tag_object, "scale", scale, "scale-set", TRUE, NULL);
 733                 }
 734                 break;
 735
 736         case stylehint_Oblique:
 737                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 738                 break;
 739
 740         case stylehint_Proportional:
 741         {
 742                 gchar *font_family;
 743                 gboolean family_set;
 744
 745                 if(wintype != wintype_TextBuffer) {
 746                         if(val)
 747                                 WARNING("Style hint 'propotional' only supported on text buffers.");
 748
 749                         break;
 750                 }
 751
 752                 GtkTextTag *font_tag = g_hash_table_lookup(glk_data->styles->text_buffer, val? "default" : "preformatted");
 753                 g_object_get(font_tag, "family", &font_family, "family-set", &family_set, NULL);
 754                 g_object_set(tag_object, "family", font_family, "family-set", family_set, NULL);
 755                 g_free(font_family);
 756         }
 757                 break;
 758
 759         case stylehint_TextColor:
 760                 glkcolor_to_gdkcolor(val, &color);
 761
 762                 if(!reverse_color)
 763                         g_object_set(tag_object, "foreground-gdk", &color, "foreground-set", TRUE, NULL);
 764                 else
 765                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 766
 767                 break;
 768
 769         case stylehint_BackColor:
 770                 glkcolor_to_gdkcolor(val, &color);
 771
 772                 if(!reverse_color)
 773                         g_object_set(tag_object, "background-gdk", &color, "background-set", TRUE, NULL);
 774                 else
 775                         g_object_set(tag_object, "foreground-gdk", &color, "background-set", TRUE, NULL);
 776
 777                 break;
 778
 779         case stylehint_ReverseColor:
 780         {
 781                 // Determine the current colors
 782
 783                 // If all fails, use black/white
 784                 // FIXME: Use system theme here
 785                 GdkColor foreground, background;
 786                 gdk_color_parse("black", &foreground);
 787                 gdk_color_parse("white", &background);
 788                 GdkColor *current_foreground = &foreground;
 789                 GdkColor *current_background = &background;
 790
 791                 if(wintype == wintype_TextBuffer) {
 792                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_buffer, "default");
 793                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_buffer, get_tag_name(styl));
 794                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 795                 }
 796                 else if(wintype == wintype_TextGrid) {
 797                         GtkTextTag* default_tag = g_hash_table_lookup(glk_data->styles->text_grid, "default");
 798                         GtkTextTag* base_tag = g_hash_table_lookup(glk_data->styles->text_grid, get_tag_name(styl));
 799                         style_cascade_colors(base_tag, tag, default_tag, &current_foreground, &current_background);
 800                 }
 801
 802                 if(val) {
 803                         /* Flip the fore- and background colors */
 804                         GdkColor *temp = current_foreground;
 805                         current_foreground = current_background;
 806                         current_background = temp;
 807                 }
 808
 809                 g_object_set(tag,
 810                         "foreground-gdk", current_foreground,
 811                         "foreground-set", TRUE,
 812                         "background-gdk", current_background,
 813                         "background-set", TRUE,
 814                         NULL
 815                 );
 816
 817                 g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 818                 break;
 819         }
 820
 821         default:
 822                 WARNING("Unknown style hint");
 823         }
 824 }
 825
 826 /* Internal function: queries a text tag for the value of a given style hint */
 827 static gint
 828 query_tag(GtkTextTag *tag, glui32 wintype, glui32 hint)
 829 {
 830         gint intval;
 831         gdouble doubleval;
 832         GdkColor *colval;
 833
 834         g_return_val_if_fail(tag != NULL, 0);
 835
 836         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 837
 838         switch(hint) {
 839         case stylehint_Indentation:
 840                 g_object_get(tag, "left_margin", &intval, NULL);
 841                 return intval/5;
 842
 843         case stylehint_ParaIndentation:
 844                 g_object_get(tag, "indent", &intval, NULL);
 845                 return intval/5;
 846
 847         case stylehint_Justification:
 848                 g_object_get(tag, "justification", &intval, NULL);
 849                 switch(intval) {
 850                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush;
 851                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight;
 852                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered;
 853                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush;
 854                         default:
 855                                 WARNING("Unknown justification");
 856                                 return stylehint_just_LeftFlush;
 857                 }
 858
 859         case stylehint_Weight:
 860                 g_object_get(tag, "weight", &intval, NULL);
 861                 switch(intval) {
 862                         case PANGO_WEIGHT_LIGHT: return -1;
 863                         case PANGO_WEIGHT_NORMAL: return 0;
 864                         case PANGO_WEIGHT_BOLD: return 1;
 865                         default: WARNING("Unknown font weight"); return 0;
 866                 }
 867
 868         case stylehint_Size:
 869                 g_object_get(tag, "scale", &doubleval, NULL);
 870                 return (gint)round(log(doubleval) / log(1.2));
 871
 872         case stylehint_Oblique:
 873                 g_object_get(tag, "style", &intval , NULL);
 874                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 875
 876         case stylehint_Proportional:
 877                 /* Use pango_font_family_is_monospace()? */
 878         {
 879                 gchar *font_family, *query_font_family;
 880                 GtkTextTag *font_tag = g_hash_table_lookup(
 881                     wintype == wintype_TextBuffer? glk_data->styles->text_buffer : glk_data->styles->text_grid,
 882                     "preformatted");
 883                 g_object_get(font_tag, "family", &font_family, NULL);
 884                 g_object_get(tag, "family", &query_font_family, NULL);
 885                 gint retval = strcmp(font_family, query_font_family)? 0 : 1;
 886                 g_free(font_family);
 887                 g_free(query_font_family);
 888                 return retval;
 889         }
 890
 891         case stylehint_TextColor:
 892                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 893                 return gdkcolor_to_glkcolor(colval);
 894
 895         case stylehint_BackColor:
 896                 g_object_get(tag, "background-gdk", &colval, NULL);
 897                 return gdkcolor_to_glkcolor(colval);
 898
 899         case stylehint_ReverseColor:
 900                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 901
 902         default:
 903                 WARNING("Unknown style hint");
 904         }
 905
 906         return 0;
 907 }
 908
 909 /**
 910  * glk_stylehint_set:
 911  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 912  * @styl: The style to set a hint for.
 913  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 914  * @val: The style hint. The meaning of this depends on @hint.
 915  *
 916  * Sets a hint about the appearance of one style for a particular type of
 917  * window. You can also set @wintype to %wintype_AllTypes, which sets a hint for
 918  * all types of window.
 919  * <note><para>
 920  *  There is no equivalent constant to set a hint for all styles of a single
 921  *  window type.
 922  * </para></note>
 923  */
 924 void
 925 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 926 {
 927 #ifdef DEBUG_STYLES
 928         g_printf("glk_stylehint_set(wintype=%d, styl=%d, hint=%d, val=%d)\n", wintype, styl, hint, val);
 929 #endif
 930
 931         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 932
 933         GtkTextTag *to_change;
 934         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 935                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 936                 apply_stylehint_to_tag(to_change, wintype_TextBuffer, styl, hint, val);
 937         }
 938
 939         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 940                 to_change = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 941                 apply_stylehint_to_tag(to_change, wintype_TextGrid, styl, hint, val);
 942         }
 943 }
 944
 945 /**
 946  * glk_stylehint_clear:
 947  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 948  * @styl: The style to set a hint for.
 949  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 950  *
 951  * Clears a hint about the appearance of one style for a particular type of
 952  * window to its default value. You can also set @wintype to %wintype_AllTypes,
 953  * which clears a hint for all types of window.
 954  * <note><para>
 955  *  There is no equivalent constant to reset a hint for all styles of a single
 956  *  window type.
 957  * </para></note>
 958  */
 959 void
 960 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 961 {
 962 #ifdef DEBUG_STYLES
 963         g_printf("glk_stylehint_clear(wintype=%d, styl=%d, hint=%d)\n", wintype, styl, hint);
 964 #endif
 965
 966         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
 967         GtkTextTag *tag;
 968
 969         switch(wintype) {
 970         case wintype_TextBuffer:
 971                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
 972                 if(tag) {
 973                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 974                 }
 975                 break;
 976         case wintype_TextGrid:
 977                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
 978                 if(tag) {
 979                         glk_stylehint_set( wintype, styl, hint, query_tag(tag, wintype, hint) );
 980                 }
 981         default:
 982                 return;
 983         }
 984 }
 985
 986 /**
 987  * glk_style_distinguish:
 988  * @win: The window in which the styles are to be distinguished.
 989  * @styl1: The first style to be distinguished from the second style.
 990  * @styl2: The second style to be distinguished from the first style.
 991  *
 992  * Decides whether two styles are visually distinguishable in the given window.
 993  * The exact meaning of this is left for the library to determine.
 994  * <note><title>Chimara</title><para>
 995  *   Currently, all styles of one window are assumed to be mutually
 996  *   distinguishable.
 997  * </para></note>
 998  *
 999  * Returns: %TRUE (1) if the two styles are visually distinguishable. If they
1000  * are not, it returns %FALSE (0).
1001  */
1002 glui32
1003 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
1004 {
1005 #ifdef DEBUG_STYLES
1006         g_printf("glk_style_distinguish(win->rock=%d, styl1=%d, styl2=%d)\n", win->rock, styl1, styl2);
1007 #endif
1008
1009         /* FIXME */
1010         return styl1 != styl2;
1011 }
1012
1013 /**
1014  * glk_style_measure:
1015  * @win: The window from which to take the style.
1016  * @styl: The style to perform the measurement on.
1017  * @hint: The stylehint to measure.
1018  * @result: Address to write the result to.
1019  *
1020  * Tries to test an attribute of one style in the given window @win. The library
1021  * may not be able to determine the attribute; if not, this returns %FALSE (0).
1022  * If it can, it returns %TRUE (1) and stores the value in the location pointed
1023  * at by @result.
1024  * <note><para>
1025  *   As usual, it is legal for @result to be %NULL, although fairly pointless.
1026  * </para></note>
1027  *
1028  * The meaning of the value depends on the hint which was tested:
1029  * <variablelist>
1030  * <varlistentry>
1031  *   <term>%stylehint_Indentation, %stylehint_ParaIndentation</term>
1032  *   <listitem><para>The indentation and paragraph indentation. These are in a
1033  *   metric which is platform-dependent.</para>
1034  *   <note><para>Most likely either characters or pixels.</para></note>
1035  *   </listitem>
1036  * </varlistentry>
1037  * <varlistentry>
1038  *   <term>%stylehint_Justification</term>
1039  *   <listitem><para>One of the constants %stylehint_just_LeftFlush,
1040  *   %stylehint_just_LeftRight, %stylehint_just_Centered, or
1041  *   %stylehint_just_RightFlush.</para></listitem>
1042  * </varlistentry>
1043  * <varlistentry>
1044  *   <term>%stylehint_Size</term>
1045  *   <listitem><para>The font size. Again, this is in a platform-dependent
1046  *   metric.</para>
1047  *   <note><para>Pixels, points, or simply 1 if the library does not support
1048  *   varying font sizes.</para></note>
1049  *   </listitem>
1050  * </varlistentry>
1051  * <varlistentry>
1052  *   <term>%stylehint_Weight</term>
1053  *   <listitem><para>1 for heavy-weight fonts (boldface), 0 for normal weight,
1054  *   and -1 for light-weight fonts.</para></listitem>
1055  * </varlistentry>
1056  * <varlistentry>
1057  *   <term>%stylehint_Oblique</term>
1058  *   <listitem><para>1 for oblique fonts (italic), or 0 for normal angle.</para>
1059  *   </listitem>
1060  * </varlistentry>
1061  * <varlistentry>
1062  *   <term>%stylehint_Proportional</term>
1063  *   <listitem><para>1 for proportional-width fonts, or 0 for fixed-width.
1064  *   </para></listitem>
1065  * </varlistentry>
1066  * <varlistentry>
1067  *   <term>%stylehint_TextColor, %stylehint_BackColor</term>
1068  *   <listitem><para>These are values from 0x00000000 to 0x00FFFFFF, encoded as
1069  *   described in <link
1070  *   linkend="chimara-Suggesting-the-Appearance-of-Styles">Suggesting the
1071  *   Appearance of Styles</link>.</para></listitem>
1072  * </varlistentry>
1073  * <varlistentry>
1074  *   <term>%stylehint_ReverseColor</term>
1075  *   <listitem><para>0 for normal printing, 1 if the foreground and background
1076  *   colors are reversed.</para></listitem>
1077  * </varlistentry>
1078  * </variablelist>
1079  * Signed values, such as the %stylehint_Weight value, are cast to
1080  * <type>glui32</type>. They may be cast to <type>glsi32</type> to be dealt with
1081  * in a more natural context.
1082  *
1083  * Returns: TRUE upon successul retrieval, otherwise FALSE.
1084  */
1085 glui32
1086 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
1087 {
1088 #ifdef DEBUG_STYLES
1089         g_printf("glk_style_measure(win->rock=%d, styl=%d, hint=%d, result=...)\n", win->rock, styl, hint);
1090 #endif
1091
1092         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1093         GtkTextTag *tag;
1094
1095         switch(win->type) {
1096         case wintype_TextBuffer:
1097                 tag = g_hash_table_lookup( glk_data->glk_styles->text_buffer, get_glk_tag_name(styl) );
1098                 if(result)
1099                         *result = query_tag(tag, win->type, hint);
1100                 break;
1101         case wintype_TextGrid:
1102                 tag = g_hash_table_lookup( glk_data->glk_styles->text_grid, get_glk_tag_name(styl) );
1103                 if(result)
1104                         *result = query_tag(tag, win->type, hint);
1105         default:
1106                 return FALSE;
1107         }
1108
1109         return TRUE;
1110 }
1111
1112 /* Internal function returning the current default font for a window type
1113  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
1114  * supported for now */
1115 PangoFontDescription *
1116 get_current_font(guint32 wintype)
1117 {
1118         ChimaraGlkPrivate *glk_data = g_private_get(&glk_data_key);
1119         GHashTable *styles, *glk_styles;
1120         PangoFontDescription *font;
1121
1122         switch(wintype) {
1123         case wintype_TextGrid:
1124                 styles = glk_data->styles->text_grid;
1125                 glk_styles = glk_data->glk_styles->text_grid;
1126                 font = pango_font_description_from_string("Monospace");
1127                 break;
1128         case wintype_TextBuffer:
1129                 styles = glk_data->styles->text_buffer;
1130                 glk_styles = glk_data->glk_styles->text_buffer;
1131                 font = pango_font_description_from_string("Serif");
1132                 break;
1133         default:
1134                 return NULL;
1135         }
1136
1137         PangoAttrList *list = pango_attr_list_new();
1138
1139         text_tag_to_attr_list( g_hash_table_lookup(styles, "default"), list );
1140         PangoAttrIterator *it = pango_attr_list_get_iterator(list);
1141         pango_attr_iterator_get_font(it, font, NULL, NULL);
1142         pango_attr_iterator_destroy(it);
1143
1144         text_tag_to_attr_list( g_hash_table_lookup(styles, "normal"), list );
1145         it = pango_attr_list_get_iterator(list);
1146         pango_attr_iterator_get_font(it, font, NULL, NULL);
1147         pango_attr_iterator_destroy(it);
1148
1149         text_tag_to_attr_list( g_hash_table_lookup(glk_styles, "glk-normal"), list );
1150         it = pango_attr_list_get_iterator(list);
1151         pango_attr_iterator_get_font(it, font, NULL, NULL);
1152         pango_attr_iterator_destroy(it);
1153
1154         /* Make a copy of the family, preventing it's destruction at the end of this function. */
1155         pango_font_description_set_family( font, pango_font_description_get_family(font) );
1156
1157         pango_attr_list_unref(list);
1158
1159         return font;
1160 }
1161
1162 /* Internal function copying the attributes of a text tag to a pango attribute list */
1163 static void
1164 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
1165 {
1166         gboolean set;
1167         GdkColor *foreground, *background;
1168         gchar *string;
1169         PangoFontDescription *font_desc;
1170         gboolean strikethrough;
1171         PangoUnderline underline;
1172
1173         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
1174         if(set) {
1175                 pango_attr_list_insert(
1176                         list,
1177                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
1178                 );
1179         }
1180         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
1181         if(set) {
1182                 pango_attr_list_insert(
1183                         list,
1184                         pango_attr_background_new(background->red, background->green, background->blue)
1185                 );
1186         }
1187         g_object_get(tag, "language-set", &set, "language", &string, NULL);
1188         if(set) {
1189                 pango_attr_list_insert(
1190                         list,
1191                         pango_attr_language_new( pango_language_from_string(string) )
1192                 );
1193         }
1194
1195         /* Font description updates the following properties simultaniously:
1196          * family, style, weight, variant, stretch, size.
1197          * FIXME: Except it doesn't really.
1198          */
1199         g_object_get(tag, "font-desc", &font_desc, NULL);
1200         pango_attr_list_insert(
1201                 list,
1202                 pango_attr_font_desc_new(font_desc)
1203         );
1204
1205         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
1206         if(set) {
1207                 pango_attr_list_insert(
1208                         list,
1209                         pango_attr_strikethrough_new(strikethrough)
1210                 );
1211         }
1212         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
1213         if(set) {
1214                 pango_attr_list_insert(
1215                         list,
1216                         pango_attr_underline_new(underline)
1217                 );
1218         }
1219 }
1220
1221 /* Update pager tag */
1222 void
1223 style_update(ChimaraGlk *glk)
1224 {
1225         CHIMARA_GLK_USE_PRIVATE(glk, priv);
1226
1227         GtkTextTag *pager_tag = GTK_TEXT_TAG( g_hash_table_lookup(priv->styles->text_buffer, "pager") );
1228         text_tag_to_attr_list(pager_tag, priv->pager_attr_list);
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 static void
1234 style_cascade_colors(GtkTextTag *tag, GtkTextTag *glk_tag, GtkTextTag *default_tag, GdkColor **foreground, GdkColor **background)
1235 {
1236         gboolean foreground_set = FALSE;
1237         gboolean background_set = FALSE;
1238         gint reverse_color;
1239
1240         // Default color
1241         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(default_tag), "reverse-color") );
1242         g_object_get(default_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1243         if(foreground_set)
1244                 g_object_get(default_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1245         if(background_set)
1246                 g_object_get(default_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1247
1248         // Player defined color
1249         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse-color") );
1250         g_object_get(tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1251         if(foreground_set)
1252                 g_object_get(tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1253         if(background_set)
1254                 g_object_get(tag, "background-gdk", reverse_color ? foreground:background, NULL);
1255
1256         // GLK defined color
1257         reverse_color = GPOINTER_TO_INT( g_object_get_data(G_OBJECT(glk_tag), "reverse-color") );
1258         g_object_get(glk_tag, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1259         if(foreground_set)
1260                 g_object_get(glk_tag, "foreground-gdk", reverse_color ? background:foreground, NULL);
1261         if(background_set)
1262                 g_object_get(glk_tag, "background-gdk", reverse_color ? foreground:background, NULL);
1263
1264 }
1265
1266 /* Determine the current colors used to render the text for a given stream.
1267  * This can be set in a number of places */
1268 void
1269 style_stream_colors(strid_t str, GdkColor **foreground, GdkColor **background)
1270 {
1271         VALID_STREAM(str, return);
1272         g_return_if_fail(str->window != NULL);
1273         g_return_if_fail(str->window->type != wintype_TextBuffer || str->window->type != wintype_TextGrid);
1274
1275         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(str->window->widget) );
1276         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1277         GtkTextTag* default_tag = gtk_text_tag_table_lookup(tags, "default");
1278         GtkTextTag* tag = gtk_text_tag_table_lookup(tags, str->style);
1279         GtkTextTag* glk_tag = gtk_text_tag_table_lookup(tags, str->glk_style);
1280
1281         style_cascade_colors(tag, glk_tag, default_tag, foreground, background);
1282
1283         gboolean foreground_set, background_set;
1284
1285         // Windows can have zcolors defined
1286         if(str->window->zcolor) {
1287                 g_object_get(str->window->zcolor, "foreground-set", &foreground_set, "background-set", &background_set, NULL);
1288                 if(foreground_set)
1289                         g_object_get(str->window->zcolor, "foreground-gdk", foreground, NULL);
1290                 if(background_set)
1291                         g_object_get(str->window->zcolor, "background-gdk", background, NULL);
1292         }
1293 }
1294
1295 /* Apply styles to a segment of text in a GtkTextBuffer, combining multiple
1296  * GtkTextTags.
1297  */
1298 void
1299 style_apply(winid_t win, GtkTextIter *start, GtkTextIter *end)
1300 {
1301         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
1302         GtkTextTagTable *tags = gtk_text_buffer_get_tag_table(buffer);
1303
1304         GtkTextTag *default_tag = gtk_text_tag_table_lookup(tags, "default");
1305         GtkTextTag *style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->style);
1306         GtkTextTag *glk_style_tag = gtk_text_tag_table_lookup(tags, win->window_stream->glk_style);
1307
1308         // Player's style overrides
1309         gtk_text_buffer_apply_tag(buffer, style_tag, start, end);
1310
1311         // GLK Program's style overrides
1312         gtk_text_buffer_apply_tag(buffer, glk_style_tag, start, end);
1313
1314         // Default style
1315         gtk_text_buffer_apply_tag(buffer, default_tag, start, end);
1316
1317         // Link style overrides
1318         if(win->window_stream->hyperlink_mode) {
1319                 GtkTextTag *link_style_tag = gtk_text_tag_table_lookup(tags, "hyperlink");
1320                 GtkTextTag *link_tag = win->current_hyperlink->tag;
1321                 gtk_text_buffer_apply_tag(buffer, link_style_tag, start, end);
1322                 gtk_text_buffer_apply_tag(buffer, link_tag, start, end);
1323         }
1324
1325         // GLK Program's style overrides using garglk_set_zcolors()
1326         if(win->zcolor != NULL) {
1327                 gtk_text_buffer_apply_tag(buffer, win->zcolor, start, end);
1328         }
1329
1330         // GLK Program's style overrides using garglk_set_reversevideo()
1331         if(win->zcolor_reversed != NULL) {
1332                 gtk_text_buffer_apply_tag(buffer, win->zcolor_reversed, start, end);
1333         }
1334 }
1335