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         if(glk_data->css_file != NULL) {
 291                 int f = open(glk_data->css_file, O_RDONLY);
 292                 if(f != -1)
 293                 {
 294                         g_scanner_input_file(scanner, f);
 295                         scanner->input_name = glk_data->css_file;
 296                         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 297                         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 298                         scanner->config->symbol_2_token = TRUE;
 299                         scanner->config->cpair_comment_single = NULL;
 300                         scanner->config->scan_float = FALSE;
 301
 302                         /* Run the scanner over the CSS file, overriding defaults */
 303                         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 304                                 if( !style_accept_style_selector(scanner) )
 305                                         break;
 306                         }
 307
 308                         g_scanner_destroy(scanner);
 309                 }
 310                 else
 311                         g_warning("Could not find CSS file");
 312         }
 313
 314         /* Set the current style to a copy of the default style */
 315         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 316         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 317         glk_data->current_styles->text_grid = current_text_grid_styles;
 318         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 319
 320         text_tag_to_attr_list(pager_tag, glk_data->pager_attr_list);
 321
 322         glk_data->style_initialized = TRUE;
 323 }
 324
 325 /* Internal function: parses a token */
 326 static gboolean
 327 style_accept(GScanner *scanner, GTokenType token)
 328 {
 329         GTokenType next = g_scanner_get_next_token(scanner);
 330         if(next != token ) {
 331                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 332                 return FALSE;
 333         } else {
 334                 return TRUE;
 335         }
 336 }
 337
 338 /* Internal function: parses a style selector */
 339 static gboolean
 340 style_accept_style_selector(GScanner *scanner)
 341 {
 342         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 343
 344         GtkTextTag *current_tag;
 345         gchar *field;
 346         GTokenType token = g_scanner_get_next_token(scanner);
 347         GTokenValue value = g_scanner_cur_value(scanner);
 348
 349         if(
 350                 token != G_TOKEN_IDENTIFIER ||
 351                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 352         ) {
 353                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 354                 return FALSE;
 355         }
 356
 357         field = g_strdup(value.v_identifier);
 358
 359         if( !style_accept(scanner, '.') )
 360                 return FALSE;
 361
 362         token = g_scanner_get_next_token(scanner);
 363         value = g_scanner_cur_value(scanner);
 364
 365         if(token != G_TOKEN_IDENTIFIER) {
 366                 g_scanner_error(scanner, "CSS Error: style selector expected");
 367                 return FALSE;
 368         }
 369
 370         if( !strcmp(field, "buffer") )
 371                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 372         else
 373                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 374
 375         if(current_tag == NULL) {
 376                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 377                 return FALSE;
 378         }
 379
 380         if( !style_accept(scanner, '{') )
 381                 return FALSE;
 382
 383         while( g_scanner_peek_next_token(scanner) != '}') {
 384                 if( !style_accept_style_hint(scanner, current_tag) )
 385                         return FALSE;
 386         }
 387
 388         if( !style_accept(scanner, '}') )
 389                 return FALSE;
 390
 391         return TRUE;
 392 }
 393
 394 /* Internal function: parses a style hint */
 395 static gboolean
 396 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 397 {
 398         GTokenType token = g_scanner_get_next_token(scanner);
 399         GTokenValue value = g_scanner_cur_value(scanner);
 400         gchar *hint;
 401
 402         if(token != G_TOKEN_IDENTIFIER) {
 403                 g_scanner_error(scanner, "CSS Error: style hint expected");
 404                 return FALSE;
 405         }
 406
 407         hint = g_strdup(value.v_identifier);
 408
 409         if( !style_accept(scanner, ':') )
 410                 return FALSE;
 411
 412         token = g_scanner_get_next_token(scanner);
 413         value = g_scanner_cur_value(scanner);
 414
 415         if( !strcmp(hint, "font-family") ) {
 416                 if(token != G_TOKEN_STRING) {
 417                         g_scanner_error(scanner, "CSS Error: string expected");
 418                         return FALSE;
 419                 }
 420                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 421         }
 422         else if( !strcmp(hint, "font-weight") ) {
 423                 if(token != G_TOKEN_IDENTIFIER) {
 424                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 425                         return FALSE;
 426                 }
 427
 428                 if( !strcmp(value.v_identifier, "bold") )
 429                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 430                 else if( !strcmp(value.v_identifier, "normal") )
 431                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 432                 else {
 433                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 434                         return FALSE;
 435                 }
 436         }
 437         else if( !strcmp(hint, "font-style") ) {
 438                 if(token != G_TOKEN_IDENTIFIER) {
 439                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 440                         return FALSE;
 441                 }
 442
 443                 if( !strcmp(value.v_identifier, "italic") )
 444                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 445                 else if( !strcmp(value.v_identifier, "normal") )
 446                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 447                 else {
 448                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 449                         return FALSE;
 450                 }
 451         }
 452         else if( !strcmp(hint, "font-size") ) {
 453                 if(token == G_TOKEN_INT)
 454                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 455                 else if(token == G_TOKEN_FLOAT)
 456                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 457                 else {
 458                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 459                         return FALSE;
 460                 }
 461         }
 462         else if( !strcmp(hint, "color") ) {
 463                 if(token != G_TOKEN_IDENTIFIER) {
 464                         g_scanner_error(scanner, "CSS Error: hex color expected");
 465                         return FALSE;
 466                 }
 467
 468                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 469         }
 470         else if( !strcmp(hint, "background-color") ) {
 471                 if(token != G_TOKEN_IDENTIFIER) {
 472                         g_scanner_error(scanner, "CSS Error: hex color expected");
 473                         return FALSE;
 474                 }
 475                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 476         }
 477         else if( !strcmp(hint, "text-align") ) {
 478                 if(token != G_TOKEN_IDENTIFIER) {
 479                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 480                         return FALSE;
 481                 }
 482
 483                 if( !strcmp(value.v_identifier, "left") )
 484                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 485                 else if( !strcmp(value.v_identifier, "right") )
 486                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 487                 else if( !strcmp(value.v_identifier, "center") )
 488                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 489                 else {
 490                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 491                         return FALSE;
 492                 }
 493         }
 494         else if( !strcmp(hint, "margin-left") ) {
 495                 if(token != G_TOKEN_INT) {
 496                         g_scanner_error(scanner, "CSS Error: integer expected");
 497                         return FALSE;
 498                 }
 499                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 500         }
 501         else if( !strcmp(hint, "margin-right") ) {
 502                 if(token != G_TOKEN_INT) {
 503                         g_scanner_error(scanner, "CSS Error: integer expected");
 504                         return FALSE;
 505                 }
 506                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 507         }
 508         else if( !strcmp(hint, "margin-top") ) {
 509                 if(token != G_TOKEN_INT) {
 510                         g_scanner_error(scanner, "CSS Error: integer expected");
 511                         return FALSE;
 512                 }
 513                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 514         }
 515         else if( !strcmp(hint, "margin-bottom") ) {
 516                 if(token != G_TOKEN_INT) {
 517                         g_scanner_error(scanner, "CSS Error: integer expected");
 518                         return FALSE;
 519                 }
 520                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 521         }
 522
 523         else {
 524                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 525                 return FALSE;
 526         }
 527
 528         if( !style_accept(scanner, ';') )
 529                 return FALSE;
 530
 531         return TRUE;
 532 }
 533
 534 /* Internal function: parses a glk color to a #hex-value */
 535 static void
 536 glkcolor_to_hex(glui32 val, gchar *buffer)
 537 {
 538         g_return_if_fail(buffer != NULL);
 539
 540         sprintf(buffer, "#%02X%02X%02X",
 541                 ((val & 0xff0000) >> 16),
 542                 ((val & 0x00ff00) >> 8),
 543                 (val & 0x0000ff)
 544         );
 545 }
 546
 547 /* Internal function: parses a glk color to a GdkColor */
 548 void
 549 glkcolor_to_gdkcolor(glui32 val, GdkColor *color)
 550 {
 551         color->red = 256 * ((val & 0xff0000) >> 16);
 552         color->green = 256 * ((val & 0x00ff00) >> 8);
 553         color->blue = 256 * (val & 0x0000ff);
 554 }
 555
 556 /* Internal function: parses a GdkColor to a glk color */
 557 static glui32
 558 gdkcolor_to_glkcolor(GdkColor *color)
 559 {
 560         g_return_val_if_fail(color != NULL, 0);
 561         return (glui32) color->pixel;
 562 }
 563
 564 /* Internal function: changes a GTK tag to correspond with the given style. */
 565 static void
 566 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 567 {
 568         g_return_if_fail(tag != NULL);
 569
 570         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 571         GObject *tag_object = G_OBJECT(tag);
 572
 573         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 574
 575         int i = 0;
 576         gchar color[20];
 577         switch(hint) {
 578         case stylehint_Indentation:
 579                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 580                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 581                 break;
 582
 583         case stylehint_ParaIndentation:
 584                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 585                 break;
 586
 587         case stylehint_Justification:
 588                 switch(val) {
 589                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 590                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 591                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 592                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 593                         default:
 594                                 WARNING("Unknown justification");
 595                                 i = GTK_JUSTIFY_LEFT;
 596                 }
 597                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 598                 break;
 599
 600         case stylehint_Weight:
 601                 switch(val) {
 602                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 603                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 604                         case  1: i = PANGO_WEIGHT_BOLD; break;
 605                         default: WARNING("Unknown font weight");
 606                 }
 607                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 608                 break;
 609
 610         case stylehint_Size:
 611                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 612                 break;
 613
 614         case stylehint_Oblique:
 615                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 616                 break;
 617
 618         case stylehint_Proportional:
 619                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 620                 break;
 621
 622         case stylehint_TextColor:
 623                 glkcolor_to_hex(val, color);
 624
 625                 if(!reverse_color)
 626                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 627                 else
 628                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 629
 630                 break;
 631
 632         case stylehint_BackColor:
 633                 glkcolor_to_hex(val, color);
 634
 635                 if(!reverse_color)
 636                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 637                 else
 638                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 639
 640                 break;
 641
 642         case stylehint_ReverseColor:
 643                 if(reverse_color != val) {
 644                         /* Flip the fore- and background colors */
 645                         GdkColor* foreground_color;
 646                         GdkColor* background_color;
 647                         gint f_set, b_set = 0;
 648                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 649
 650                         if(f_set)
 651                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 652                         if(b_set)
 653                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 654
 655                         if(b_set)
 656                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 657                         else
 658                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 659
 660                         if(f_set)
 661                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 662                         else
 663                                 g_object_set(tag_object, "background", "#000000", NULL);
 664
 665                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 666                 }
 667                 break;
 668
 669         default:
 670                 WARNING("Unknown style hint");
 671         }
 672 }
 673 /*Internal function: queries a text tag for the value of a given style hint */
 674 static gint
 675 query_tag(GtkTextTag *tag, glui32 hint)
 676 {
 677         gint intval;
 678         GObject *objval;
 679         GdkColor *colval;
 680
 681         g_return_val_if_fail(tag != NULL, 0);
 682
 683         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 684
 685         switch(hint) {
 686         case stylehint_Indentation:
 687                 g_object_get(tag, "left_margin", &intval, NULL);
 688                 return intval/5;
 689                 break;
 690
 691         case stylehint_ParaIndentation:
 692                 g_object_get(tag, "indent", &intval, NULL);
 693                 return intval/5;
 694                 break;
 695
 696         case stylehint_Justification:
 697                 g_object_get(tag, "justification", &intval, NULL);
 698                 switch(intval) {
 699                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 700                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 701                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 702                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 703                         default:
 704                                 WARNING("Unknown justification");
 705                                 return stylehint_just_LeftFlush;
 706                 }
 707                 break;
 708
 709         case stylehint_Weight:
 710                 g_object_get(tag, "weight", &intval, NULL);
 711                 switch(intval) {
 712                         case PANGO_WEIGHT_LIGHT: return -1; break;
 713                         case PANGO_WEIGHT_NORMAL: return 0; break;
 714                         case PANGO_WEIGHT_BOLD: return 1; break;
 715                         default: WARNING("Unknown font weight"); return 0;
 716                 }
 717                 break;
 718
 719         case stylehint_Size:
 720                 g_object_get(tag, "size", &intval, NULL);
 721                 return (intval/2)-14;
 722                 break;
 723
 724         case stylehint_Oblique:
 725                 g_object_get(tag, "style", &intval , NULL);
 726                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 727                 break;
 728
 729         case stylehint_Proportional:
 730                 g_object_get(tag, "font-desc", &objval, NULL);
 731                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 732                 break;
 733
 734         case stylehint_TextColor:
 735                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 736                 return gdkcolor_to_glkcolor(colval);
 737                 break;
 738
 739         case stylehint_BackColor:
 740                 g_object_get(tag, "background-gdk", &colval, NULL);
 741                 return gdkcolor_to_glkcolor(colval);
 742                 break;
 743
 744         case stylehint_ReverseColor:
 745                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 746                 break;
 747
 748         default:
 749                 WARNING("Unknown style hint");
 750         }
 751
 752         return 0;
 753 }
 754
 755 /**
 756  * glk_stylehint_set:
 757  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 758  * @styl: The style to set a hint for.
 759  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 760  * @val: The style hint. The meaning of this depends on @hint.
 761  *
 762  * Sets a hint about the appearance of one style for a particular type of
 763  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 764  * all types of window.
 765  * <note><para>
 766  *  There is no equivalent constant to set a hint for all styles of a single
 767  *  window type.
 768  * </para></note>
 769  */
 770 void
 771 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 772 {
 773         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 774
 775         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 776                 style_init();
 777         }
 778
 779         GtkTextTag *to_change;
 780         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 781                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 782                 apply_stylehint_to_tag(to_change, hint, val);
 783         }
 784
 785         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 786                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 787                 apply_stylehint_to_tag(to_change, hint, val);
 788         }
 789 }
 790
 791 /**
 792  * glk_stylehint_clear:
 793  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 794  * @styl: The style to set a hint for.
 795  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 796  *
 797  * Resets a hint about the appearance of one style for a particular type of
 798  * window to it's default value. You can also set wintype to %wintype_AllTypes, which resets a hint for
 799  * all types of window.
 800  * <note><para>
 801  *  There is no equivalent constant to reset a hint for all styles of a single
 802  *  window type.
 803  * </para></note>
 804  */
 805 void
 806 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 807 {
 808         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 809         GtkTextTag *tag;
 810
 811         switch(wintype) {
 812         case wintype_TextBuffer:
 813                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 814                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 815                 break;
 816         case wintype_TextGrid:
 817                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 818                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 819         default:
 820                 return;
 821         }
 822 }
 823
 824 /**
 825  * glk_style_distinguish:
 826  * @win: The window in which the styles are to be distinguished.
 827  * @styl1: The first style to be distinguished from the second style.
 828  * @styl2: The second styel to be distinguished from the first style.
 829  *
 830  * Returns: TRUE if the two styles are visually distinguishable in the given window.
 831  * If they are not, it returns FALSE.
 832  */
 833 glui32
 834 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 835 {
 836         return styl1 != styl2;
 837 }
 838
 839 /**
 840  * glk_style_measure:
 841  * @win: The window from which to take the style.
 842  * @styl: The style to perform the measurement on.
 843  * @hint: The stylehint to measure.
 844  * @result: Address to write the result to.
 845  *
 846  * This function can be used to query the current value of a particular style hint.
 847  * Returns: TRUE upon successul retrievel, otherwise FALSE.
 848  */
 849 glui32
 850 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 851 {
 852         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 853         GtkTextTag *tag;
 854
 855         switch(win->type) {
 856         case wintype_TextBuffer:
 857                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 858                 *result = query_tag(tag, hint);
 859                 break;
 860         case wintype_TextGrid:
 861                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 862                 *result = query_tag(tag, hint);
 863         default:
 864                 return FALSE;
 865         }
 866
 867         return TRUE;
 868 }
 869
 870 /* Internal function returning the current default font for a window type
 871  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 872  * supported for now */
 873 PangoFontDescription*
 874 get_current_font(guint32 wintype)
 875 {
 876         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 877         GtkTextTag *normal;
 878
 879         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 880                 style_init();
 881         }
 882
 883         switch(wintype) {
 884         case wintype_TextGrid:
 885                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 886                 break;
 887         case wintype_TextBuffer:
 888                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 889                 break;
 890         default:
 891                 return NULL;
 892         }
 893
 894         PangoFontDescription *font;
 895         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 896
 897         return font;
 898 }
 899
 900 /* Internal function copying the attributes of a text tag to a pango attribute list */
 901 static void
 902 text_tag_to_attr_list(GtkTextTag *tag, PangoAttrList *list)
 903 {
 904         gboolean set;
 905         GdkColor *foreground, *background;
 906         gchar *string;
 907         PangoFontDescription *font_desc;
 908         gboolean strikethrough;
 909         PangoUnderline underline;
 910
 911         g_object_get(tag, "foreground-set", &set, "foreground-gdk", &foreground, NULL);
 912         if(set) {
 913                 pango_attr_list_insert(
 914                         list,
 915                         pango_attr_foreground_new(foreground->red, foreground->green, foreground->blue)
 916                 );
 917         }
 918         g_object_get(tag, "background-set", &set, "background-gdk", &background, NULL);
 919         if(set) {
 920                 pango_attr_list_insert(
 921                         list,
 922                         pango_attr_background_new(background->red, background->green, background->blue)
 923                 );
 924         }
 925         g_object_get(tag, "language-set", &set, "language", &string, NULL);
 926         if(set) {
 927                 pango_attr_list_insert(
 928                         list,
 929                         pango_attr_language_new( pango_language_from_string(string) )
 930                 );
 931         }
 932
 933         /* Font description updates the following properties simultaniously:
 934          * family, style, weight, variant, stretch, size
 935          */
 936         g_object_get(tag, "font-desc", &font_desc, NULL);
 937         pango_attr_list_insert(
 938                 list,
 939                 pango_attr_font_desc_new(font_desc)
 940         );
 941
 942         g_object_get(tag, "strikethrough-set", &set, "strikethrough", &strikethrough, NULL);
 943         if(set) {
 944                 pango_attr_list_insert(
 945                         list,
 946                         pango_attr_strikethrough_new(strikethrough)
 947                 );
 948         }
 949         g_object_get(tag, "underline-set", &set, "underline", &underline, NULL);
 950         if(set) {
 951                 pango_attr_list_insert(
 952                         list,
 953                         pango_attr_underline_new(underline)
 954                 );
 955         }
 956 }