libchimara/style.c

   1 #include <stdio.h>
   2 #include <fcntl.h>
   3 #include <string.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);
  15 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  16 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  17 static void style_table_copy(gpointer key, gpointer tag, gpointer target_table);
  18 static void text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list);
  19 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  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 listed above. However, any value is actually
  27  * legal; if the interpreter does not recognize the style value, it will treat
  28  * it as %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 static const gchar* TAG_NAMES[] = {
  43         "normal",
  44         "emphasized",
  45         "preformatted",
  46         "header",
  47         "subheader",
  48         "alert",
  49         "note",
  50         "block-quote",
  51         "input",
  52         "user1",
  53         "user2"
  54 };
  55
  56 /* Internal function: mapping from style enum to tag name */
  57 static gchar*
  58 get_tag_name(glui32 style)
  59 {
  60         if(style >= style_NUMSTYLES) {
  61                 WARNING("Unsupported style");
  62                 return "normal";
  63         } else {
  64                 return (gchar*) TAG_NAMES[style];
  65         }
  66 }
  67
  68 /**
  69  * glk_set_style_stream:
  70  * @str: Output stream to change the style of
  71  * @styl: The style to apply
  72  *
  73  * This changes the style of the stream @str. See glk_set_style().
  74  */
  75 void
  76 glk_set_style_stream(strid_t str, glui32 styl) {
  77         if(str->window == NULL)
  78                 return;
  79
  80         flush_window_buffer(str->window);
  81         str->style = get_tag_name(styl);
  82 }
  83
  84 /* Internal function: call this to initialize the layout of the 'more' prompt. */
  85 void
  86 style_init_more_prompt(winid_t win)
  87 {
  88         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  89
  90         win->pager_layout = gtk_widget_create_pango_layout(win->widget, "More");
  91         pango_layout_set_attributes(win->pager_layout, glk_data->pager_attr_list);
  92 }
  93
  94 /* Internal function: call this to initialize the default styles to a textbuffer. */
  95 void
  96 style_init_textbuffer(GtkTextBuffer *buffer)
  97 {
  98         g_return_if_fail(buffer != NULL);
  99
 100         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 101         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 102                 style_init();
 103         }
 104
 105         /* Copy the current text tags to the textbuffer's tag table */
 106         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 107 }
 108
 109
 110 /* Internal function: call this to initialize the default styles to a textgrid. */
 111 void
 112 style_init_textgrid(GtkTextBuffer *buffer)
 113 {
 114         g_return_if_fail(buffer != NULL);
 115
 116         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 117         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 118                 style_init();
 119         }
 120
 121         /* Copy the current text tags to the textgrid's tag table */
 122         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 123 }
 124
 125 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 126 static void
 127 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 128 {
 129         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 130 }
 131
 132 /* Internal function used to iterate over a style table, copying it */
 133 static void
 134 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 135 {
 136         g_return_if_fail(key != NULL);
 137         g_return_if_fail(tag != NULL);
 138         g_return_if_fail(target_table != NULL);
 139
 140         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 141 }
 142
 143 /* Internal function that copies a text tag */
 144 GtkTextTag*
 145 gtk_text_tag_copy(GtkTextTag *tag)
 146 {
 147         GtkTextTag *copy;
 148
 149         g_return_val_if_fail(tag != NULL, NULL);
 150
 151         copy = gtk_text_tag_new(tag->name);
 152         gtk_text_attributes_copy_values(tag->values, copy->values);
 153
 154         #define _COPY_FLAG(flag) copy->flag = tag->flag
 155                 _COPY_FLAG (bg_color_set);
 156                 _COPY_FLAG (bg_color_set);
 157                 _COPY_FLAG (bg_stipple_set);
 158                 _COPY_FLAG (fg_color_set);
 159                 _COPY_FLAG (fg_stipple_set);
 160                 _COPY_FLAG (justification_set);
 161                 _COPY_FLAG (left_margin_set);
 162                 _COPY_FLAG (indent_set);
 163                 _COPY_FLAG (rise_set);
 164                 _COPY_FLAG (strikethrough_set);
 165                 _COPY_FLAG (right_margin_set);
 166                 _COPY_FLAG (pixels_above_lines_set);
 167                 _COPY_FLAG (pixels_below_lines_set);
 168                 _COPY_FLAG (pixels_inside_wrap_set);
 169                 _COPY_FLAG (tabs_set);
 170                 _COPY_FLAG (underline_set);
 171                 _COPY_FLAG (wrap_mode_set);
 172                 _COPY_FLAG (bg_full_height_set);
 173                 _COPY_FLAG (invisible_set);
 174                 _COPY_FLAG (editable_set);
 175                 _COPY_FLAG (language_set);
 176         #undef _COPY_FLAG
 177
 178         /* Copy the data that was added manually */
 179         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 180
 181         if(reverse_color)
 182                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 183
 184         return copy;
 185 }
 186
 187 /* Internal function that reads the default styles from a CSS file */
 188 void
 189 style_init()
 190 {
 191         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 192         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 193         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 194         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 195         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 196         GtkTextTag *tag;
 197
 198         /* Initialise the default styles for a text grid */
 199         tag = gtk_text_tag_new("normal");
 200         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 201         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 202
 203         tag = gtk_text_tag_new("emphasized");
 204         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 205         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 206
 207         tag = gtk_text_tag_new("preformatted");
 208         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 209         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 210
 211         tag = gtk_text_tag_new("header");
 212         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 213         g_hash_table_insert(default_text_grid_styles, "header", tag);
 214
 215         tag = gtk_text_tag_new("subheader");
 216         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 217         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 218
 219         tag = gtk_text_tag_new("alert");
 220         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 221         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 222
 223         tag = gtk_text_tag_new("note");
 224         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 225         g_hash_table_insert(default_text_grid_styles, "note", tag);
 226
 227         tag = gtk_text_tag_new("block-quote");
 228         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 229         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 230
 231         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 232         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 233         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 234
 235         tag = gtk_text_tag_new("hyperlink");
 236         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 237         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 238
 239         /* Tags for the textbuffer */
 240         tag = gtk_text_tag_new("normal");
 241         g_object_set(tag, "font-desc", glk_data->default_font_desc, NULL);
 242         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 243
 244         tag = gtk_text_tag_new("emphasized");
 245         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 246         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 247
 248         tag = gtk_text_tag_new("preformatted");
 249         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 250         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 251
 252         tag = gtk_text_tag_new("header");
 253         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 254         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 255
 256         tag = gtk_text_tag_new("subheader");
 257         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 258         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 259
 260         tag = gtk_text_tag_new("alert");
 261         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 262         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 263
 264         tag = gtk_text_tag_new("note");
 265         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 266         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 267
 268         tag = gtk_text_tag_new("block-quote");
 269         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 270         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 271
 272         g_hash_table_insert(default_text_buffer_styles, "input", gtk_text_tag_new("input"));
 273         g_hash_table_insert(default_text_buffer_styles, "user1", gtk_text_tag_new("user1"));
 274         g_hash_table_insert(default_text_buffer_styles, "user2", gtk_text_tag_new("user2"));
 275
 276         tag = gtk_text_tag_new("hyperlink");
 277         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 278         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 279
 280         GtkTextTag *pager_tag = gtk_text_tag_new("pager");
 281         g_object_set(pager_tag, "foreground", "#ffffff", "background", "#000000", NULL);
 282         g_hash_table_insert(default_text_buffer_styles, "pager", pager_tag);
 283
 284         glk_data->default_styles->text_grid = default_text_grid_styles;
 285         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 286
 287         /* Create the CSS file scanner */
 288         GScanner *scanner = g_scanner_new(NULL);
 289
 290         int f = open(glk_data->css_file, O_RDONLY);
 291         if(f != -1)
 292         {
 293                 g_scanner_input_file(scanner, f);
 294                 scanner->input_name = glk_data->css_file;
 295                 scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 296                 scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 297                 scanner->config->symbol_2_token = TRUE;
 298                 scanner->config->cpair_comment_single = NULL;
 299                 scanner->config->scan_float = FALSE;
 300
 301                 /* Run the scanner over the CSS file, overriding defaults */
 302                 while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 303                         if( !style_accept_style_selector(scanner) )
 304                                 break;
 305                 }
 306
 307                 g_scanner_destroy(scanner);
 308         }
 309         else
 310                 g_warning("Could not find CSS file");
 311
 312         /* Set the current style to a copy of the default style */
 313         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 314         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 315         glk_data->current_styles->text_grid = current_text_grid_styles;
 316         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 317
 318         text_tag_to_attr_list(pager_tag, glk_data->pager_attr_list);
 319
 320         glk_data->style_initialized = TRUE;
 321 }
 322
 323 /* Internal function: parses a token */
 324 static gboolean
 325 style_accept(GScanner *scanner, GTokenType token)
 326 {
 327         GTokenType next = g_scanner_get_next_token(scanner);
 328         if(next != token ) {
 329                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 330                 return FALSE;
 331         } else {
 332                 return TRUE;
 333         }
 334 }
 335
 336 /* Internal function: parses a style selector */
 337 static gboolean
 338 style_accept_style_selector(GScanner *scanner)
 339 {
 340         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 341
 342         GtkTextTag *current_tag;
 343         gchar *field;
 344         GTokenType token = g_scanner_get_next_token(scanner);
 345         GTokenValue value = g_scanner_cur_value(scanner);
 346
 347         if(
 348                 token != G_TOKEN_IDENTIFIER ||
 349                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 350         ) {
 351                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 352                 return FALSE;
 353         }
 354
 355         field = g_strdup(value.v_identifier);
 356
 357         if( !style_accept(scanner, '.') )
 358                 return FALSE;
 359
 360         token = g_scanner_get_next_token(scanner);
 361         value = g_scanner_cur_value(scanner);
 362
 363         if(token != G_TOKEN_IDENTIFIER) {
 364                 g_scanner_error(scanner, "CSS Error: style selector expected");
 365                 return FALSE;
 366         }
 367
 368         if( !strcmp(field, "buffer") )
 369                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 370         else
 371                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 372
 373         if(current_tag == NULL) {
 374                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 375                 return FALSE;
 376         }
 377
 378         if( !style_accept(scanner, '{') )
 379                 return FALSE;
 380
 381         while( g_scanner_peek_next_token(scanner) != '}') {
 382                 if( !style_accept_style_hint(scanner, current_tag) )
 383                         return FALSE;
 384         }
 385
 386         if( !style_accept(scanner, '}') )
 387                 return FALSE;
 388
 389         return TRUE;
 390 }
 391
 392 /* Internal function: parses a style hint */
 393 static gboolean
 394 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 395 {
 396         GTokenType token = g_scanner_get_next_token(scanner);
 397         GTokenValue value = g_scanner_cur_value(scanner);
 398         gchar *hint;
 399
 400         if(token != G_TOKEN_IDENTIFIER) {
 401                 g_scanner_error(scanner, "CSS Error: style hint expected");
 402                 return FALSE;
 403         }
 404
 405         hint = g_strdup(value.v_identifier);
 406
 407         if( !style_accept(scanner, ':') )
 408                 return FALSE;
 409
 410         token = g_scanner_get_next_token(scanner);
 411         value = g_scanner_cur_value(scanner);
 412
 413         if( !strcmp(hint, "font-family") ) {
 414                 if(token != G_TOKEN_STRING) {
 415                         g_scanner_error(scanner, "CSS Error: string expected");
 416                         return FALSE;
 417                 }
 418                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 419         }
 420         else if( !strcmp(hint, "font-weight") ) {
 421                 if(token != G_TOKEN_IDENTIFIER) {
 422                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 423                         return FALSE;
 424                 }
 425
 426                 if( !strcmp(value.v_identifier, "bold") )
 427                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 428                 else if( !strcmp(value.v_identifier, "normal") )
 429                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 430                 else {
 431                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 432                         return FALSE;
 433                 }
 434         }
 435         else if( !strcmp(hint, "font-style") ) {
 436                 if(token != G_TOKEN_IDENTIFIER) {
 437                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 438                         return FALSE;
 439                 }
 440
 441                 if( !strcmp(value.v_identifier, "italic") )
 442                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 443                 else if( !strcmp(value.v_identifier, "normal") )
 444                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 445                 else {
 446                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 447                         return FALSE;
 448                 }
 449         }
 450         else if( !strcmp(hint, "font-size") ) {
 451                 if(token == G_TOKEN_INT)
 452                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 453                 else if(token == G_TOKEN_FLOAT)
 454                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 455                 else {
 456                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 457                         return FALSE;
 458                 }
 459         }
 460         else if( !strcmp(hint, "color") ) {
 461                 if(token != G_TOKEN_IDENTIFIER) {
 462                         g_scanner_error(scanner, "CSS Error: hex color expected");
 463                         return FALSE;
 464                 }
 465
 466                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 467         }
 468         else if( !strcmp(hint, "background-color") ) {
 469                 if(token != G_TOKEN_IDENTIFIER) {
 470                         g_scanner_error(scanner, "CSS Error: hex color expected");
 471                         return FALSE;
 472                 }
 473                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 474         }
 475         else if( !strcmp(hint, "text-align") ) {
 476                 if(token != G_TOKEN_IDENTIFIER) {
 477                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 478                         return FALSE;
 479                 }
 480
 481                 if( !strcmp(value.v_identifier, "left") )
 482                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 483                 else if( !strcmp(value.v_identifier, "right") )
 484                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 485                 else if( !strcmp(value.v_identifier, "center") )
 486                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 487                 else {
 488                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 489                         return FALSE;
 490                 }
 491         }
 492         else if( !strcmp(hint, "margin-left") ) {
 493                 if(token != G_TOKEN_INT) {
 494                         g_scanner_error(scanner, "CSS Error: integer expected");
 495                         return FALSE;
 496                 }
 497                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 498         }
 499         else if( !strcmp(hint, "margin-right") ) {
 500                 if(token != G_TOKEN_INT) {
 501                         g_scanner_error(scanner, "CSS Error: integer expected");
 502                         return FALSE;
 503                 }
 504                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 505         }
 506         else if( !strcmp(hint, "margin-top") ) {
 507                 if(token != G_TOKEN_INT) {
 508                         g_scanner_error(scanner, "CSS Error: integer expected");
 509                         return FALSE;
 510                 }
 511                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 512         }
 513         else if( !strcmp(hint, "margin-bottom") ) {
 514                 if(token != G_TOKEN_INT) {
 515                         g_scanner_error(scanner, "CSS Error: integer expected");
 516                         return FALSE;
 517                 }
 518                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 519         }
 520
 521         else {
 522                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 523                 return FALSE;
 524         }
 525
 526         if( !style_accept(scanner, ';') )
 527                 return FALSE;
 528
 529         return TRUE;
 530 }
 531
 532 /* Internal function: parses a glk color to a #hex-value */
 533 static void
 534 glkcolor_to_hex(glui32 val, gchar *buffer)
 535 {
 536         g_return_if_fail(buffer != NULL);
 537
 538         sprintf(buffer, "#%02X%02X%02X",
 539                 ((val & 0xff0000) >> 16),
 540                 ((val & 0x00ff00) >> 8),
 541                 (val & 0x0000ff)
 542         );
 543 }
 544
 545 /* Internal function: parses a glk color to a GdkColor */
 546 void
 547 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 548 {
 549         color->red = 256 * ((val & 0xff0000) >> 16);
 550         color->green = 256 * ((val & 0x00ff00) >> 8);
 551         color->blue = 256 * (val & 0x0000ff);
 552 }
 553
 554 /* Internal function: parses a GdkColor to a glk color */
 555 static glui32
 556 gdkcolor_to_glkcolor(GdkColor *color)
 557 {
 558         g_return_val_if_fail(color != NULL, 0);
 559         return (glui32) color->pixel;
 560 }
 561
 562 /* Internal function: changes a GTK tag to correspond with the given style. */
 563 static void
 564 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 565 {
 566         g_return_if_fail(tag != NULL);
 567
 568         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 569         GObject *tag_object = G_OBJECT(tag);
 570
 571         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 572
 573         int i = 0;
 574         gchar color[20];
 575         switch(hint) {
 576         case stylehint_Indentation:
 577                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 578                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 579                 break;
 580
 581         case stylehint_ParaIndentation:
 582                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 583                 break;
 584
 585         case stylehint_Justification:
 586                 switch(val) {
 587                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 588                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 589                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 590                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 591                         default:
 592                                 WARNING("Unknown justification");
 593                                 i = GTK_JUSTIFY_LEFT;
 594                 }
 595                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 596                 break;
 597
 598         case stylehint_Weight:
 599                 switch(val) {
 600                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 601                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 602                         case  1: i = PANGO_WEIGHT_BOLD; break;
 603                         default: WARNING("Unknown font weight");
 604                 }
 605                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 606                 break;
 607
 608         case stylehint_Size:
 609                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 610                 break;
 611
 612         case stylehint_Oblique:
 613                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 614                 break;
 615
 616         case stylehint_Proportional:
 617                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 618                 break;
 619
 620         case stylehint_TextColor:
 621                 glkcolor_to_hex(val, color);
 622
 623                 if(!reverse_color)
 624                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 625                 else
 626                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 627
 628                 break;
 629
 630         case stylehint_BackColor:
 631                 glkcolor_to_hex(val, color);
 632
 633                 if(!reverse_color)
 634                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 635                 else
 636                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 637
 638                 break;
 639
 640         case stylehint_ReverseColor:
 641                 if(reverse_color != val) {
 642                         /* Flip the fore- and background colors */
 643                         GdkColor* foreground_color;
 644                         GdkColor* background_color;
 645                         gint f_set, b_set = 0;
 646                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 647
 648                         if(f_set)
 649                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 650                         if(b_set)
 651                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 652
 653                         if(b_set)
 654                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 655                         else
 656                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 657
 658                         if(f_set)
 659                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 660                         else
 661                                 g_object_set(tag_object, "background", "#000000", NULL);
 662
 663                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 664                 }
 665                 break;
 666
 667         default:
 668                 WARNING("Unknown style hint");
 669         }
 670 }
 671 /*Internal function: queries a text tag for the value of a given style hint */
 672 static gint
 673 query_tag(GtkTextTag *tag, glui32 hint)
 674 {
 675         gint intval;
 676         GObject *objval;
 677         GdkColor *colval;
 678
 679         g_return_val_if_fail(tag != NULL, 0);
 680
 681         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 682
 683         switch(hint) {
 684         case stylehint_Indentation:
 685                 g_object_get(tag, "left_margin", &intval, NULL);
 686                 return intval/5;
 687                 break;
 688
 689         case stylehint_ParaIndentation:
 690                 g_object_get(tag, "indent", &intval, NULL);
 691                 return intval/5;
 692                 break;
 693
 694         case stylehint_Justification:
 695                 g_object_get(tag, "justification", &intval, NULL);
 696                 switch(intval) {
 697                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 698                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 699                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 700                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 701                         default:
 702                                 WARNING("Unknown justification");
 703                                 return stylehint_just_LeftFlush;
 704                 }
 705                 break;
 706
 707         case stylehint_Weight:
 708                 g_object_get(tag, "weight", &intval, NULL);
 709                 switch(intval) {
 710                         case PANGO_WEIGHT_LIGHT: return -1; break;
 711                         case PANGO_WEIGHT_NORMAL: return 0; break;
 712                         case PANGO_WEIGHT_BOLD: return 1; break;
 713                         default: WARNING("Unknown font weight"); return 0;
 714                 }
 715                 break;
 716
 717         case stylehint_Size:
 718                 g_object_get(tag, "size", &intval, NULL);
 719                 return (intval/2)-14;
 720                 break;
 721
 722         case stylehint_Oblique:
 723                 g_object_get(tag, "style", &intval , NULL);
 724                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 725                 break;
 726
 727         case stylehint_Proportional:
 728                 g_object_get(tag, "font-desc", &objval, NULL);
 729                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 730                 break;
 731
 732         case stylehint_TextColor:
 733                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 734                 return gdkcolor_to_glkcolor(colval);
 735                 break;
 736
 737         case stylehint_BackColor:
 738                 g_object_get(tag, "background-gdk", &colval, NULL);
 739                 return gdkcolor_to_glkcolor(colval);
 740                 break;
 741
 742         case stylehint_ReverseColor:
 743                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 744                 break;
 745
 746         default:
 747                 WARNING("Unknown style hint");
 748         }
 749
 750         return 0;
 751 }
 752
 753 /**
 754  * glk_stylehint_set:
 755  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 756  * @styl: The style to set a hint for.
 757  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 758  * @val: The style hint. The meaning of this depends on @hint.
 759  *
 760  * Sets a hint about the appearance of one style for a particular type of
 761  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 762  * all types of window.
 763  * <note><para>
 764  *  There is no equivalent constant to set a hint for all styles of a single
 765  *  window type.
 766  * </para></note>
 767  */
 768 void
 769 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 770 {
 771         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 772
 773         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 774                 style_init();
 775         }
 776
 777         GtkTextTag *to_change;
 778         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 779                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 780                 apply_stylehint_to_tag(to_change, hint, val);
 781         }
 782
 783         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 784                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 785                 apply_stylehint_to_tag(to_change, hint, val);
 786         }
 787 }
 788
 789 /**
 790  * glk_stylehint_clear:
 791  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 792  * @styl: The style to set a hint for.
 793  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 794  *
 795  * Resets a hint about the appearance of one style for a particular type of
 796  * window to it's default value. You can also set wintype to %wintype_AllTypes, which resets a hint for
 797  * all types of window.
 798  * <note><para>
 799  *  There is no equivalent constant to reset a hint for all styles of a single
 800  *  window type.
 801  * </para></note>
 802  */
 803 void
 804 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 805 {
 806         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 807         GtkTextTag *tag;
 808
 809         switch(wintype) {
 810         case wintype_TextBuffer:
 811                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 812                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 813                 break;
 814         case wintype_TextGrid:
 815                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 816                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 817         default:
 818                 return;
 819         }
 820 }
 821
 822 /**
 823  * glk_style_distinguish:
 824  * @win: The window in which the styles are to be distinguished.
 825  * @styl1: The first style to be distinguished from the second style.
 826  * @styl2: The second styel to be distinguished from the first style.
 827  *
 828  * Returns: TRUE if the two styles are visually distinguishable in the given window.
 829  * If they are not, it returns FALSE.
 830  */
 831 glui32
 832 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 833 {
 834         return styl1 != styl2;
 835 }
 836
 837 /**
 838  * glk_style_measure:
 839  * @win: The window from which to take the style.
 840  * @styl: The style to perform the measurement on.
 841  * @hint: The stylehint to measure.
 842  * @result: Address to write the result to.
 843  *
 844  * This function can be used to query the current value of a particular style hint.
 845  * Returns: TRUE upon successul retrievel, otherwise FALSE.
 846  */
 847 glui32
 848 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 849 {
 850         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 851         GtkTextTag *tag;
 852
 853         switch(win->type) {
 854         case wintype_TextBuffer:
 855                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 856                 *result = query_tag(tag, hint);
 857                 break;
 858         case wintype_TextGrid:
 859                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 860                 *result = query_tag(tag, hint);
 861         default:
 862                 return FALSE;
 863         }
 864
 865         return TRUE;
 866 }
 867
 868 /* Internal function returning the current default font for a window type
 869  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 870  * supported for now */
 871 PangoFontDescription*
 872 get_current_font(guint32 wintype)
 873 {
 874         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 875         GtkTextTag *normal;
 876
 877         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 878                 style_init();
 879         }
 880
 881         switch(wintype) {
 882         case wintype_TextGrid:
 883                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 884                 break;
 885         case wintype_TextBuffer:
 886                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 887                 break;
 888         default:
 889                 return NULL;
 890         }
 891
 892         PangoFontDescription *font;
 893         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 894
 895         return font;
 896 }
 897
 898 /* Internal function copying the attributes of a text tag to a pango attribute list */
 899 static void
 900 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
 901 {
 902         gboolean set;
 903         GdkColor *foreground, *background;
 904         gchar *string;
 905         PangoFontDescription *font_desc;
 906         gboolean strikethrough;
 907         PangoUnderline underline;
 908
 909         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
 910         if(set) {
 911                 pango_attr_list_insert(
 912                         list,
 913                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
 914                 );
 915         }
 916         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
 917         if(set) {
 918                 pango_attr_list_insert(
 919                         list,
 920                         pango_attr_background_new(background->red, background->green, background->blue)
 921                 );
 922         }
 923         g_object_get(tag, "language-set", &set, "language", &string, NULL);
 924         if(set) {
 925                 pango_attr_list_insert(
 926                         list,
 927                         pango_attr_language_new( pango_language_from_string(string) )
 928                 );
 929         }
 930
 931         /* Font description updates the following properties simultaniously:
 932          * family, style, weight, variant, stretch, size
 933          */
 934         g_object_get(tag, "font-desc", &font_desc, NULL);
 935         pango_attr_list_insert(
 936                 list,
 937                 pango_attr_font_desc_new(font_desc)
 938         );
 939
 940         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
 941         if(set) {
 942                 pango_attr_list_insert(
 943                         list,
 944                         pango_attr_strikethrough_new(strikethrough)
 945                 );
 946         }
 947         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
 948         if(set) {
 949                 pango_attr_list_insert(
 950                         list,
 951                         pango_attr_underline_new(underline)
 952                 );
 953         }
 954 }