libchimara/style.c

   1 #include "style.h"
   2 #include <stdio.h>
   3 #include <fcntl.h>
   4
   5 extern GPrivate *glk_data_key;
   6
   7 static gboolean style_accept(GScanner *scanner, GTokenType token);
   8 static gboolean style_accept_style_selector(GScanner *scanner);
   9 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  10 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  11 static void style_table_copy(gpointer key, gpointer tag, gpointer target_table);
  12 static GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  13
  14 /**
  15  * glk_set_style:
  16  * @styl: The style to apply
  17  *
  18  * Changes the style of the current output stream. @styl should be one of the
  19  * <code>style_</code> constants listed above. However, any value is actually
  20  * legal; if the interpreter does not recognize the style value, it will treat
  21  * it as %style_Normal.
  22  * <note><para>
  23  *  This policy allows for the future definition of styles without breaking old
  24  *  Glk libraries.
  25  * </para></note>
  26  */
  27 void
  28 glk_set_style(glui32 styl)
  29 {
  30         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  31         g_return_if_fail(glk_data->current_stream != NULL);
  32         glk_set_style_stream(glk_data->current_stream, styl);
  33 }
  34
  35 static const gchar* TAG_NAMES[] = {
  36         "normal",
  37         "emphasized",
  38         "preformatted",
  39         "header",
  40         "subheader",
  41         "alert",
  42         "note",
  43         "block-quote",
  44         "input",
  45         "user1",
  46         "user2"
  47 };
  48
  49 /* Internal function: mapping from style enum to tag name */
  50 static gchar*
  51 get_tag_name(glui32 style)
  52 {
  53         if(style >= style_NUMSTYLES) {
  54                 WARNING("Unsupported style");
  55                 return "normal";
  56         } else {
  57                 return (gchar*) TAG_NAMES[style];
  58         }
  59 }
  60
  61 /**
  62  * glk_set_style_stream:
  63  * @str: Output stream to change the style of
  64  * @styl: The style to apply
  65  *
  66  * This changes the style of the stream @str. See glk_set_style().
  67  */
  68 void
  69 glk_set_style_stream(strid_t str, glui32 styl) {
  70         if(str->window == NULL)
  71                 return;
  72
  73         flush_window_buffer(str->window);
  74         str->style = get_tag_name(styl);
  75 }
  76
  77 /* Internal function: call this to initialize the default styles to a textbuffer. */
  78 void
  79 style_init_textbuffer(GtkTextBuffer *buffer)
  80 {
  81         g_return_if_fail(buffer != NULL);
  82
  83         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  84         if( G_UNLIKELY(!glk_data->style_initialized) ) {
  85                 style_init();
  86         }
  87
  88         /* Copy the current text tags to the textbuffer's tag table */
  89         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  90 }
  91
  92 /* Internal function: call this to initialize the default styles to a textgrid. */
  93 void
  94 style_init_textgrid(GtkTextBuffer *buffer)
  95 {
  96         g_return_if_fail(buffer != NULL);
  97
  98         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  99         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 100                 style_init();
 101         }
 102
 103         /* Copy the current text tags to the textgrid's tag table */
 104         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 105 }
 106
 107 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 108 static void
 109 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 110 {
 111         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 112 }
 113
 114 /* Internal function used to iterate over a style table, copying it */
 115 static void
 116 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 117 {
 118         g_return_if_fail(key != NULL);
 119         g_return_if_fail(tag != NULL);
 120         g_return_if_fail(target_table != NULL);
 121
 122         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 123 }
 124
 125 /* Internal function that copies a text tag */
 126 static GtkTextTag*
 127 gtk_text_tag_copy(GtkTextTag *tag)
 128 {
 129         GtkTextTag *copy;
 130
 131         g_return_val_if_fail(tag != NULL, NULL);
 132
 133         copy = gtk_text_tag_new(tag->name);
 134         gtk_text_attributes_copy_values(tag->values, copy->values);
 135
 136         #define _COPY_FLAG(flag) copy->flag = tag->flag
 137                 _COPY_FLAG (bg_color_set);
 138                 _COPY_FLAG (bg_color_set);
 139                 _COPY_FLAG (bg_stipple_set);
 140                 _COPY_FLAG (fg_color_set);
 141                 _COPY_FLAG (fg_stipple_set);
 142                 _COPY_FLAG (justification_set);
 143                 _COPY_FLAG (left_margin_set);
 144                 _COPY_FLAG (indent_set);
 145                 _COPY_FLAG (rise_set);
 146                 _COPY_FLAG (strikethrough_set);
 147                 _COPY_FLAG (right_margin_set);
 148                 _COPY_FLAG (pixels_above_lines_set);
 149                 _COPY_FLAG (pixels_below_lines_set);
 150                 _COPY_FLAG (pixels_inside_wrap_set);
 151                 _COPY_FLAG (tabs_set);
 152                 _COPY_FLAG (underline_set);
 153                 _COPY_FLAG (wrap_mode_set);
 154                 _COPY_FLAG (bg_full_height_set);
 155                 _COPY_FLAG (invisible_set);
 156                 _COPY_FLAG (editable_set);
 157                 _COPY_FLAG (language_set);
 158         #undef _COPY_FLAG
 159
 160         /* Copy the reverse_color attribute, that was added manually */
 161         g_object_set_data( G_OBJECT(copy), "reverse_color", g_object_get_data(G_OBJECT(tag), "reverse_color") );
 162
 163         return copy;
 164 }
 165
 166 /* Internal function that reads the default styles from a CSS file */
 167 void
 168 style_init()
 169 {
 170         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 171         GHashTable *default_text_grid_styles = g_hash_table_new(g_str_hash, g_str_equal);
 172         GHashTable *default_text_buffer_styles = g_hash_table_new(g_str_hash, g_str_equal);
 173         GHashTable *current_text_grid_styles = g_hash_table_new(g_str_hash, g_str_equal);
 174         GHashTable *current_text_buffer_styles = g_hash_table_new(g_str_hash, g_str_equal);
 175         GtkTextTag *tag;
 176
 177         /* Create the CSS file scanner */
 178         GScanner *scanner = g_scanner_new(NULL);
 179
 180         int f = open(glk_data->css_file, O_RDONLY);
 181         g_return_if_fail(f != -1);
 182         g_scanner_input_file(scanner, f);
 183         scanner->input_name = glk_data->css_file;
 184         scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 185         scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 186         scanner->config->symbol_2_token = TRUE;
 187         scanner->config->cpair_comment_single = NULL;
 188         scanner->config->scan_float = FALSE;
 189
 190         /* Initialise the default styles for a text grid */
 191         tag = gtk_text_tag_new("normal");
 192         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 193         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 194
 195         tag = gtk_text_tag_new("emphasized");
 196         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 197         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 198
 199         tag = gtk_text_tag_new("preformatted");
 200         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 201         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 202
 203         tag = gtk_text_tag_new("header");
 204         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 205         g_hash_table_insert(default_text_grid_styles, "header", tag);
 206
 207         tag = gtk_text_tag_new("subheader");
 208         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 209         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 210
 211         tag = gtk_text_tag_new("alert");
 212         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 213         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 214
 215         tag = gtk_text_tag_new("note");
 216         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 217         g_hash_table_insert(default_text_grid_styles, "note", tag);
 218
 219         tag = gtk_text_tag_new("block-quote");
 220         g_object_set(tag, "style", PANGO_STYLE_ITALIC, NULL);
 221         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 222
 223         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 224         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 225         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 226
 227         /* Tags for the textbuffer */
 228         tag = gtk_text_tag_new("normal");
 229         g_object_set(tag, "font-desc", glk_data->default_font_desc, NULL);
 230         g_hash_table_insert(default_text_buffer_styles, "normal", tag);
 231
 232         tag = gtk_text_tag_new("emphasized");
 233         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 234         g_hash_table_insert(default_text_buffer_styles, "emphasized", tag);
 235
 236         tag = gtk_text_tag_new("preformatted");
 237         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 238         g_hash_table_insert(default_text_buffer_styles, "preformatted", tag);
 239
 240         tag = gtk_text_tag_new("header");
 241         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 242         g_hash_table_insert(default_text_buffer_styles, "header", tag);
 243
 244         tag = gtk_text_tag_new("subheader");
 245         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 246         g_hash_table_insert(default_text_buffer_styles, "subheader", tag);
 247
 248         tag = gtk_text_tag_new("alert");
 249         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 250         g_hash_table_insert(default_text_buffer_styles, "alert", tag);
 251
 252         tag = gtk_text_tag_new("note");
 253         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 254         g_hash_table_insert(default_text_buffer_styles, "note", tag);
 255
 256         tag = gtk_text_tag_new("block-quote");
 257         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, NULL);
 258         g_hash_table_insert(default_text_buffer_styles, "block-quote", tag);
 259
 260         g_hash_table_insert(default_text_buffer_styles, "input", gtk_text_tag_new("input"));
 261         g_hash_table_insert(default_text_buffer_styles, "user1", gtk_text_tag_new("user1"));
 262         g_hash_table_insert(default_text_buffer_styles, "user2", gtk_text_tag_new("user2"));
 263
 264         glk_data->default_styles->text_grid = default_text_grid_styles;
 265         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 266
 267         /* Run the scanner over the CSS file, overriding defaults */
 268         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 269                 if( !style_accept_style_selector(scanner) )
 270                         break;
 271         }
 272
 273         /* Set the current style to a copy of the default style */
 274         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 275         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 276         glk_data->current_styles->text_grid = current_text_grid_styles;
 277         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 278
 279         g_scanner_destroy(scanner);
 280
 281         glk_data->style_initialized = TRUE;
 282 }
 283
 284 /* Internal function: parses a token */
 285 static gboolean
 286 style_accept(GScanner *scanner, GTokenType token)
 287 {
 288         GTokenType next = g_scanner_get_next_token(scanner);
 289         if(next != token ) {
 290                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 291                 return FALSE;
 292         } else {
 293                 return TRUE;
 294         }
 295 }
 296
 297 /* Internal function: parses a style selector */
 298 static gboolean
 299 style_accept_style_selector(GScanner *scanner)
 300 {
 301         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 302
 303         GtkTextTag *current_tag;
 304         gchar *field;
 305         GTokenType token = g_scanner_get_next_token(scanner);
 306         GTokenValue value = g_scanner_cur_value(scanner);
 307
 308         if(
 309                 token != G_TOKEN_IDENTIFIER ||
 310                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 311         ) {
 312                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 313                 return FALSE;
 314         }
 315
 316         field = g_strdup(value.v_identifier);
 317
 318         if( !style_accept(scanner, '.') )
 319                 return FALSE;
 320
 321         token = g_scanner_get_next_token(scanner);
 322         value = g_scanner_cur_value(scanner);
 323
 324         if(token != G_TOKEN_IDENTIFIER) {
 325                 g_scanner_error(scanner, "CSS Error: style selector expected");
 326                 return FALSE;
 327         }
 328
 329         if( !strcmp(field, "buffer") )
 330                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 331         else
 332                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 333
 334         if(current_tag == NULL) {
 335                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 336                 return FALSE;
 337         }
 338
 339         if( !style_accept(scanner, '{') )
 340                 return FALSE;
 341
 342         while( g_scanner_peek_next_token(scanner) != '}') {
 343                 if( !style_accept_style_hint(scanner, current_tag) )
 344                         return FALSE;
 345         }
 346
 347         if( !style_accept(scanner, '}') )
 348                 return FALSE;
 349
 350         return TRUE;
 351 }
 352
 353 /* Internal function: parses a style hint */
 354 static gboolean
 355 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 356 {
 357         GTokenType token = g_scanner_get_next_token(scanner);
 358         GTokenValue value = g_scanner_cur_value(scanner);
 359         gchar *hint;
 360
 361         if(token != G_TOKEN_IDENTIFIER) {
 362                 g_scanner_error(scanner, "CSS Error: style hint expected");
 363                 return FALSE;
 364         }
 365
 366         hint = g_strdup(value.v_identifier);
 367
 368         if( !style_accept(scanner, ':') )
 369                 return FALSE;
 370
 371         token = g_scanner_get_next_token(scanner);
 372         value = g_scanner_cur_value(scanner);
 373
 374         if( !strcmp(hint, "font-family") ) {
 375                 if(token != G_TOKEN_STRING) {
 376                         g_scanner_error(scanner, "CSS Error: string expected");
 377                         return FALSE;
 378                 }
 379                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 380         }
 381         else if( !strcmp(hint, "font-weight") ) {
 382                 if(token != G_TOKEN_IDENTIFIER) {
 383                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 384                         return FALSE;
 385                 }
 386
 387                 if( !strcmp(value.v_identifier, "bold") )
 388                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 389                 else if( !strcmp(value.v_identifier, "normal") )
 390                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 391                 else {
 392                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 393                         return FALSE;
 394                 }
 395         }
 396         else if( !strcmp(hint, "font-style") ) {
 397                 if(token != G_TOKEN_IDENTIFIER) {
 398                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 399                         return FALSE;
 400                 }
 401
 402                 if( !strcmp(value.v_identifier, "italic") )
 403                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 404                 else if( !strcmp(value.v_identifier, "normal") )
 405                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 406                 else {
 407                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 408                         return FALSE;
 409                 }
 410         }
 411         else if( !strcmp(hint, "font-size") ) {
 412                 if(token == G_TOKEN_INT)
 413                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 414                 else if(token == G_TOKEN_FLOAT)
 415                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 416                 else {
 417                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 418                         return FALSE;
 419                 }
 420         }
 421         else if( !strcmp(hint, "color") ) {
 422                 if(token != G_TOKEN_IDENTIFIER) {
 423                         g_scanner_error(scanner, "CSS Error: hex color expected");
 424                         return FALSE;
 425                 }
 426
 427                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 428         }
 429         else if( !strcmp(hint, "background-color") ) {
 430                 if(token != G_TOKEN_IDENTIFIER) {
 431                         g_scanner_error(scanner, "CSS Error: hex color expected");
 432                         return FALSE;
 433                 }
 434                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 435         }
 436         else if( !strcmp(hint, "text-align") ) {
 437                 if(token != G_TOKEN_IDENTIFIER) {
 438                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 439                         return FALSE;
 440                 }
 441
 442                 if( !strcmp(value.v_identifier, "left") )
 443                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 444                 else if( !strcmp(value.v_identifier, "right") )
 445                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 446                 else if( !strcmp(value.v_identifier, "center") )
 447                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 448                 else {
 449                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 450                         return FALSE;
 451                 }
 452         }
 453         else if( !strcmp(hint, "margin-left") ) {
 454                 if(token != G_TOKEN_INT) {
 455                         g_scanner_error(scanner, "CSS Error: integer expected");
 456                         return FALSE;
 457                 }
 458                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 459         }
 460         else if( !strcmp(hint, "margin-right") ) {
 461                 if(token != G_TOKEN_INT) {
 462                         g_scanner_error(scanner, "CSS Error: integer expected");
 463                         return FALSE;
 464                 }
 465                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 466         }
 467         else if( !strcmp(hint, "margin-top") ) {
 468                 if(token != G_TOKEN_INT) {
 469                         g_scanner_error(scanner, "CSS Error: integer expected");
 470                         return FALSE;
 471                 }
 472                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 473         }
 474         else if( !strcmp(hint, "margin-bottom") ) {
 475                 if(token != G_TOKEN_INT) {
 476                         g_scanner_error(scanner, "CSS Error: integer expected");
 477                         return FALSE;
 478                 }
 479                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 480         }
 481
 482         else {
 483                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 484                 return FALSE;
 485         }
 486
 487         if( !style_accept(scanner, ';') )
 488                 return FALSE;
 489
 490         return TRUE;
 491 }
 492
 493 /* Internal function: parses a glk color to a #hex-value */
 494 static void
 495 color_format(glui32 val, gchar *buffer)
 496 {
 497         g_return_if_fail(buffer != NULL);
 498
 499         sprintf(buffer, "#%02X%02X%02X",
 500                 ((val & 0xff0000) >> 16),
 501                 ((val & 0x00ff00) >> 8),
 502                 (val & 0x0000ff)
 503         );
 504 }
 505
 506 /* Internal function: parses a GdkColor to a glk color */
 507 static glui32
 508 color_parse_gdk(GdkColor *color)
 509 {
 510         g_return_val_if_fail(color != NULL, 0);
 511         return (glui32) color->pixel;
 512 }
 513
 514 /* Internal function: changes a GTK tag to correspond with the given style. */
 515 static void
 516 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 517 {
 518         g_return_if_fail(tag != NULL);
 519
 520         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 521         GObject *tag_object = G_OBJECT(tag);
 522
 523         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 524
 525         int i = 0;
 526         gchar color[20];
 527         switch(hint) {
 528         case stylehint_Indentation:
 529                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 530                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 531                 break;
 532
 533         case stylehint_ParaIndentation:
 534                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 535                 break;
 536
 537         case stylehint_Justification:
 538                 switch(val) {
 539                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 540                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 541                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 542                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 543                         default:
 544                                 WARNING("Unknown justification");
 545                                 i = GTK_JUSTIFY_LEFT;
 546                 }
 547                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 548                 break;
 549
 550         case stylehint_Weight:
 551                 switch(val) {
 552                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 553                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 554                         case  1: i = PANGO_WEIGHT_BOLD; break;
 555                         default: WARNING("Unknown font weight");
 556                 }
 557                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 558                 break;
 559
 560         case stylehint_Size:
 561                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 562                 break;
 563
 564         case stylehint_Oblique:
 565                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 566                 break;
 567
 568         case stylehint_Proportional:
 569                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 570                 break;
 571
 572         case stylehint_TextColor:
 573                 color_format(val, color);
 574
 575                 if(!reverse_color)
 576                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 577                 else
 578                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 579
 580                 break;
 581
 582         case stylehint_BackColor:
 583                 color_format(val, color);
 584
 585                 if(!reverse_color)
 586                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 587                 else
 588                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 589
 590                 break;
 591
 592         case stylehint_ReverseColor:
 593                 if(reverse_color != val) {
 594                         /* Flip the fore- and background colors */
 595                         GdkColor* foreground_color;
 596                         GdkColor* background_color;
 597                         gint f_set, b_set = 0;
 598                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 599
 600                         if(f_set)
 601                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 602                         if(b_set)
 603                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 604
 605                         if(b_set)
 606                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 607                         else
 608                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 609
 610                         if(f_set)
 611                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 612                         else
 613                                 g_object_set(tag_object, "background", "#000000", NULL);
 614
 615                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 616                 }
 617                 break;
 618
 619         default:
 620                 WARNING("Unknown style hint");
 621         }
 622 }
 623 /*Internal function: queries a text tag for the value of a given style hint */
 624 static gint
 625 query_tag(GtkTextTag *tag, glui32 hint)
 626 {
 627         gint intval;
 628         GObject *objval;
 629         GdkColor *colval;
 630
 631         g_return_val_if_fail(tag != NULL, 0);
 632
 633         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 634
 635         switch(hint) {
 636         case stylehint_Indentation:
 637                 g_object_get(tag, "left_margin", &intval, NULL);
 638                 return intval/5;
 639                 break;
 640
 641         case stylehint_ParaIndentation:
 642                 g_object_get(tag, "indent", &intval, NULL);
 643                 return intval/5;
 644                 break;
 645
 646         case stylehint_Justification:
 647                 g_object_get(tag, "justification", &intval, NULL);
 648                 switch(intval) {
 649                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 650                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 651                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 652                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 653                         default:
 654                                 WARNING("Unknown justification");
 655                                 return stylehint_just_LeftFlush;
 656                 }
 657                 break;
 658
 659         case stylehint_Weight:
 660                 g_object_get(tag, "weight", &intval, NULL);
 661                 switch(intval) {
 662                         case PANGO_WEIGHT_LIGHT: return -1; break;
 663                         case PANGO_WEIGHT_NORMAL: return 0; break;
 664                         case PANGO_WEIGHT_BOLD: return 1; break;
 665                         default: WARNING("Unknown font weight"); return 0;
 666                 }
 667                 break;
 668
 669         case stylehint_Size:
 670                 g_object_get(tag, "size", &intval, NULL);
 671                 return (intval/2)-14;
 672                 break;
 673
 674         case stylehint_Oblique:
 675                 g_object_get(tag, "style", &intval , NULL);
 676                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 677                 break;
 678
 679         case stylehint_Proportional:
 680                 g_object_get(tag, "font-desc", &objval, NULL);
 681                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 682                 break;
 683
 684         case stylehint_TextColor:
 685                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 686                 return color_parse_gdk(colval);
 687                 break;
 688
 689         case stylehint_BackColor:
 690                 g_object_get(tag, "background-gdk", &colval, NULL);
 691                 return color_parse_gdk(colval);
 692                 break;
 693
 694         case stylehint_ReverseColor:
 695                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 696                 break;
 697
 698         default:
 699                 WARNING("Unknown style hint");
 700         }
 701
 702         return 0;
 703 }
 704
 705 /**
 706  * glk_stylehint_set:
 707  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 708  * @styl: The style to set a hint for.
 709  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 710  * @val: The style hint. The meaning of this depends on @hint.
 711  *
 712  * Sets a hint about the appearance of one style for a particular type of
 713  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 714  * all types of window.
 715  * <note><para>
 716  *  There is no equivalent constant to set a hint for all styles of a single
 717  *  window type.
 718  * </para></note>
 719  */
 720 void
 721 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 722 {
 723         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 724
 725         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 726                 style_init();
 727         }
 728
 729         GtkTextTag *to_change;
 730         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 731                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 732                 apply_stylehint_to_tag(to_change, hint, val);
 733         }
 734
 735         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 736                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 737                 apply_stylehint_to_tag(to_change, hint, val);
 738         }
 739 }
 740
 741 /**
 742  * glk_stylehint_clear:
 743  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 744  * @styl: The style to set a hint for.
 745  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 746  *
 747  * Resets a hint about the appearance of one style for a particular type of
 748  * window to it's default value. You can also set wintype to %wintype_AllTypes, which resets a hint for
 749  * all types of window.
 750  * <note><para>
 751  *  There is no equivalent constant to reset a hint for all styles of a single
 752  *  window type.
 753  * </para></note>
 754  */
 755 void
 756 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 757 {
 758         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 759         GtkTextTag *tag;
 760
 761         switch(wintype) {
 762         case wintype_TextBuffer:
 763                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 764                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 765                 break;
 766         case wintype_TextGrid:
 767                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 768                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 769         default:
 770                 return;
 771         }
 772 }
 773
 774 /**
 775  * glk_style_distinguish:
 776  * @win: The window in which the styles are to be distinguished.
 777  * @styl1: The first style to be distinguished from the second style.
 778  * @styl2: The second styel to be distinguished from the first style.
 779  *
 780  * Returns: TRUE if the two styles are visually distinguishable in the given window.
 781  * If they are not, it returns FALSE.
 782  */
 783 glui32
 784 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 785 {
 786         return styl1 != styl2;
 787 }
 788
 789 /**
 790  * glk_style_measure:
 791  * @win: The window from which to take the style.
 792  * @styl: The style to perform the measurement on.
 793  * @hint: The stylehint to measure.
 794  * @result: Address to write the result to.
 795  *
 796  * This function can be used to query the current value of a particular style hint.
 797  * Returns: TRUE upon successul retrievel, otherwise FALSE.
 798  */
 799 glui32
 800 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 801 {
 802         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 803         GtkTextTag *tag;
 804
 805         switch(win->type) {
 806         case wintype_TextBuffer:
 807                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 808                 *result = query_tag(tag, hint);
 809                 break;
 810         case wintype_TextGrid:
 811                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 812                 *result = query_tag(tag, hint);
 813         default:
 814                 return FALSE;
 815         }
 816
 817         return TRUE;
 818 }
 819
 820 /* Internal function returning the current default font for a window type
 821  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 822  * supported for now */
 823 PangoFontDescription*
 824 get_current_font(guint32 wintype)
 825 {
 826         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 827         GtkTextTag *normal;
 828
 829         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 830                 style_init();
 831         }
 832
 833         switch(wintype) {
 834         case wintype_TextGrid:
 835                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 836                 break;
 837         case wintype_TextBuffer:
 838                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 839                 break;
 840         default:
 841                 return NULL;
 842         }
 843
 844         PangoFontDescription *font;
 845         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 846
 847         return font;
 848 }