libchimara/style.c

   1 #include "style.h"
   2 #include <stdio.h>
   3 #include <fcntl.h>
   4
   5 extern GPrivate *glk_data_key;
   6 static gboolean chimara_style_initialized = FALSE;
   7
   8 static gboolean style_accept(GScanner *scanner, GTokenType token);
   9 static gboolean style_accept_style_selector(GScanner *scanner);
  10 static gboolean style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag);
  11 static void style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table);
  12 static void style_table_copy(gpointer key, gpointer tag, gpointer target_table);
  13 static GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  14
  15 /**
  16  * glk_set_style:
  17  * @styl: The style to apply
  18  *
  19  * Changes the style of the current output stream. @styl should be one of the
  20  * <code>style_</code> constants listed above. However, any value is actually
  21  * legal; if the interpreter does not recognize the style value, it will treat
  22  * it as %style_Normal.
  23  * <note><para>
  24  *  This policy allows for the future definition of styles without breaking old
  25  *  Glk libraries.
  26  * </para></note>
  27  */
  28 void
  29 glk_set_style(glui32 styl)
  30 {
  31         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  32         g_return_if_fail(glk_data->current_stream != NULL);
  33         glk_set_style_stream(glk_data->current_stream, styl);
  34 }
  35
  36 static const gchar* TAG_NAMES[] = {
  37         "normal",
  38         "emphasized",
  39         "preformatted",
  40         "header",
  41         "subheader",
  42         "alert",
  43         "note",
  44         "block-quote",
  45         "input",
  46         "user1",
  47         "user2"
  48 };
  49
  50 /* Internal function: mapping from style enum to tag name */
  51 static gchar*
  52 get_tag_name(glui32 style)
  53 {
  54         if(style >= style_NUMSTYLES) {
  55                 WARNING("Unsupported style");
  56                 return "normal";
  57         } else {
  58                 return (gchar*) TAG_NAMES[style];
  59         }
  60 }
  61
  62 /**
  63  * glk_set_style_stream:
  64  * @str: Output stream to change the style of
  65  * @styl: The style to apply
  66  *
  67  * This changes the style of the stream @str. See glk_set_style().
  68  */
  69 void
  70 glk_set_style_stream(strid_t str, glui32 styl) {
  71         str->style = get_tag_name(styl);
  72 }
  73
  74 /* Internal function: call this to initialize the default styles to a textbuffer. */
  75 void
  76 style_init_textbuffer(GtkTextBuffer *buffer)
  77 {
  78         g_return_if_fail(buffer != NULL);
  79
  80         if( G_UNLIKELY(!chimara_style_initialized) ) {
  81                 style_init();
  82         }
  83
  84         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  85         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  86 }
  87
  88 /* Internal function: call this to initialize the default styles to a textgrid. */
  89 void
  90 style_init_textgrid(GtkTextBuffer *buffer)
  91 {
  92         g_return_if_fail(buffer != NULL);
  93
  94         if( G_UNLIKELY(!chimara_style_initialized) ) {
  95                 style_init();
  96         }
  97
  98         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  99         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 100 }
 101
 102 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 103 static void
 104 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 105 {
 106         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 107 }
 108
 109 /* Internal function used to iterate over a style table, copying it */
 110 static void
 111 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 112 {
 113         g_return_if_fail(key != NULL);
 114         g_return_if_fail(tag != NULL);
 115         g_return_if_fail(target_table != NULL);
 116
 117         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 118 }
 119
 120 /* Internal function that copies a text tag */
 121 static GtkTextTag*
 122 gtk_text_tag_copy(GtkTextTag *tag)
 123 {
 124         GtkTextTag *copy;
 125
 126         g_return_val_if_fail(tag != NULL, NULL);
 127
 128         copy = gtk_text_tag_new(tag->name);
 129         gtk_text_attributes_copy_values(tag->values, copy->values);
 130
 131         #define _COPY_FLAG(flag) copy->flag = tag->flag
 132                 _COPY_FLAG (bg_color_set);
 133                 _COPY_FLAG (bg_color_set);
 134                 _COPY_FLAG (bg_stipple_set);
 135                 _COPY_FLAG (fg_color_set);
 136                 _COPY_FLAG (fg_stipple_set);
 137                 _COPY_FLAG (justification_set);
 138                 _COPY_FLAG (left_margin_set);
 139                 _COPY_FLAG (indent_set);
 140                 _COPY_FLAG (rise_set);
 141                 _COPY_FLAG (strikethrough_set);
 142                 _COPY_FLAG (right_margin_set);
 143                 _COPY_FLAG (pixels_above_lines_set);
 144                 _COPY_FLAG (pixels_below_lines_set);
 145                 _COPY_FLAG (pixels_inside_wrap_set);
 146                 _COPY_FLAG (tabs_set);
 147                 _COPY_FLAG (underline_set);
 148                 _COPY_FLAG (wrap_mode_set);
 149                 _COPY_FLAG (bg_full_height_set);
 150                 _COPY_FLAG (invisible_set);
 151                 _COPY_FLAG (editable_set);
 152                 _COPY_FLAG (language_set);
 153         #undef _COPY_FLAG
 154
 155         return copy;
 156 }
 157
 158 /* Internal function that reads the default styles from a CSS file */
 159 void
 160 style_init()
 161 {
 162         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 163         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 164         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 165         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 166         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, g_object_unref);
 167         GtkTextTag *tag;
 168
 169         /* Create the CSS file scanner */
 170         GScanner *scanner = g_scanner_new(NULL);
 171
 172         int f = open(glk_data->css_file, O_RDONLY);
 173         g_return_if_fail(f != -1);
 174         g_scanner_input_file(scanner, f);
 175         scanner->input_name = glk_data->css_file;
 176         scanner->config->cset_identifier_first = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ#";
 177         scanner->config->cset_identifier_nth = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789";
 178         scanner->config->symbol_2_token = TRUE;
 179         scanner->config->cpair_comment_single = NULL;
 180         scanner->config->scan_float = FALSE;
 181
 182         /* Initialise the default styles */
 183         g_hash_table_insert(default_text_grid_styles, "normal", gtk_text_tag_new("normal"));
 184
 185         tag = gtk_text_tag_new("emphasized");
 186         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 187         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 188
 189         tag = gtk_text_tag_new("preformatted");
 190         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 191         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 192
 193         tag = gtk_text_tag_new("header");
 194         g_object_set(tag, "size-points", 18.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 195         g_hash_table_insert(default_text_grid_styles, "header", tag);
 196
 197         tag = gtk_text_tag_new("subheader");
 198         g_object_set(tag, "size-points", 14.0, "weight", PANGO_WEIGHT_BOLD, NULL);
 199         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 200
 201         tag = gtk_text_tag_new("alert");
 202         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 203         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 204
 205         tag = gtk_text_tag_new("note");
 206         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 207         g_hash_table_insert(default_text_grid_styles, "note", tag);
 208
 209         tag = gtk_text_tag_new("block-quote");
 210         g_object_set(tag, "justification", GTK_JUSTIFY_CENTER, "style", PANGO_STYLE_ITALIC, NULL);
 211         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 212
 213         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 214         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 215         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 216
 217         g_hash_table_foreach(default_text_grid_styles, style_table_copy, default_text_buffer_styles);
 218         glk_data->default_styles->text_grid = default_text_grid_styles;
 219         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 220
 221         /* Run the scanner over the CSS file, overriding defaults */
 222         while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 223                 if( !style_accept_style_selector(scanner) )
 224                         break;
 225         }
 226
 227         /* Set the current style to a copy of the default style */
 228         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 229         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 230         glk_data->current_styles->text_grid = current_text_grid_styles;
 231         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 232
 233         g_scanner_destroy(scanner);
 234
 235         chimara_style_initialized = TRUE;
 236 }
 237
 238 /* Internal function: parses a token */
 239 static gboolean
 240 style_accept(GScanner *scanner, GTokenType token)
 241 {
 242         GTokenType next = g_scanner_get_next_token(scanner);
 243         if(next != token ) {
 244                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 245                 return FALSE;
 246         } else {
 247                 return TRUE;
 248         }
 249 }
 250
 251 /* Internal function: parses a style selector */
 252 static gboolean
 253 style_accept_style_selector(GScanner *scanner)
 254 {
 255         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 256
 257         GtkTextTag *current_tag;
 258         gchar *field;
 259         GTokenType token = g_scanner_get_next_token(scanner);
 260         GTokenValue value = g_scanner_cur_value(scanner);
 261
 262         if(
 263                 token != G_TOKEN_IDENTIFIER ||
 264                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 265         ) {
 266                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 267                 return FALSE;
 268         }
 269
 270         field = g_strdup(value.v_identifier);
 271
 272         if( !style_accept(scanner, '.') )
 273                 return FALSE;
 274
 275         token = g_scanner_get_next_token(scanner);
 276         value = g_scanner_cur_value(scanner);
 277
 278         if(token != G_TOKEN_IDENTIFIER) {
 279                 g_scanner_error(scanner, "CSS Error: style selector expected");
 280                 return FALSE;
 281         }
 282
 283         if( !strcmp(field, "buffer") )
 284                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 285         else
 286                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 287
 288         if(current_tag == NULL) {
 289                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 290                 return FALSE;
 291         }
 292
 293         if( !style_accept(scanner, '{') )
 294                 return FALSE;
 295
 296         while( g_scanner_peek_next_token(scanner) != '}') {
 297                 if( !style_accept_style_hint(scanner, current_tag) )
 298                         return FALSE;
 299         }
 300
 301         if( !style_accept(scanner, '}') )
 302                 return FALSE;
 303
 304         return TRUE;
 305 }
 306
 307 /* Internal function: parses a style hint */
 308 static gboolean
 309 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 310 {
 311         GTokenType token = g_scanner_get_next_token(scanner);
 312         GTokenValue value = g_scanner_cur_value(scanner);
 313         gchar *hint;
 314
 315         if(token != G_TOKEN_IDENTIFIER) {
 316                 g_scanner_error(scanner, "CSS Error: style hint expected");
 317                 return FALSE;
 318         }
 319
 320         hint = g_strdup(value.v_identifier);
 321
 322         if( !style_accept(scanner, ':') )
 323                 return FALSE;
 324
 325         token = g_scanner_get_next_token(scanner);
 326         value = g_scanner_cur_value(scanner);
 327
 328         if( !strcmp(hint, "font-family") ) {
 329                 if(token != G_TOKEN_STRING) {
 330                         g_scanner_error(scanner, "CSS Error: string expected");
 331                         return FALSE;
 332                 }
 333                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 334         }
 335         else if( !strcmp(hint, "font-weight") ) {
 336                 if(token != G_TOKEN_IDENTIFIER) {
 337                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 338                         return FALSE;
 339                 }
 340
 341                 if( !strcmp(value.v_identifier, "bold") )
 342                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 343                 else if( !strcmp(value.v_identifier, "normal") )
 344                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 345                 else {
 346                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 347                         return FALSE;
 348                 }
 349         }
 350         else if( !strcmp(hint, "font-style") ) {
 351                 if(token != G_TOKEN_IDENTIFIER) {
 352                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 353                         return FALSE;
 354                 }
 355
 356                 if( !strcmp(value.v_identifier, "italic") )
 357                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 358                 else if( !strcmp(value.v_identifier, "normal") )
 359                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 360                 else {
 361                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 362                         return FALSE;
 363                 }
 364         }
 365         else if( !strcmp(hint, "font-size") ) {
 366                 if(token == G_TOKEN_INT)
 367                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 368                 else if(token == G_TOKEN_FLOAT)
 369                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 370                 else {
 371                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 372                         return FALSE;
 373                 }
 374         }
 375         else if( !strcmp(hint, "color") ) {
 376                 if(token != G_TOKEN_IDENTIFIER) {
 377                         g_scanner_error(scanner, "CSS Error: hex color expected");
 378                         return FALSE;
 379                 }
 380
 381                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 382         }
 383         else if( !strcmp(hint, "background-color") ) {
 384                 if(token != G_TOKEN_IDENTIFIER) {
 385                         g_scanner_error(scanner, "CSS Error: hex color expected");
 386                         return FALSE;
 387                 }
 388                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 389         }
 390         else if( !strcmp(hint, "text-align") ) {
 391                 if(token != G_TOKEN_IDENTIFIER) {
 392                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 393                         return FALSE;
 394                 }
 395
 396                 if( !strcmp(value.v_identifier, "left") )
 397                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 398                 else if( !strcmp(value.v_identifier, "right") )
 399                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 400                 else if( !strcmp(value.v_identifier, "center") )
 401                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 402                 else {
 403                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 404                         return FALSE;
 405                 }
 406         }
 407         else if( !strcmp(hint, "margin-left") ) {
 408                 if(token != G_TOKEN_INT) {
 409                         g_scanner_error(scanner, "CSS Error: integer expected");
 410                         return FALSE;
 411                 }
 412                 g_object_set(current_tag, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 413         }
 414         else if( !strcmp(hint, "margin-right") ) {
 415                 if(token != G_TOKEN_INT) {
 416                         g_scanner_error(scanner, "CSS Error: integer expected");
 417                         return FALSE;
 418                 }
 419                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 420         }
 421         else if( !strcmp(hint, "margin-top") ) {
 422                 if(token != G_TOKEN_INT) {
 423                         g_scanner_error(scanner, "CSS Error: integer expected");
 424                         return FALSE;
 425                 }
 426                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 427         }
 428         else if( !strcmp(hint, "margin-bottom") ) {
 429                 if(token != G_TOKEN_INT) {
 430                         g_scanner_error(scanner, "CSS Error: integer expected");
 431                         return FALSE;
 432                 }
 433                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 434         }
 435
 436         else {
 437                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 438                 return FALSE;
 439         }
 440
 441         if( !style_accept(scanner, ';') )
 442                 return FALSE;
 443
 444         return TRUE;
 445 }
 446
 447 /* Internal function: parses a glk color to a #hex-value */
 448 static void
 449 color_format(glui32 val, gchar *buffer)
 450 {
 451         g_return_if_fail(buffer != NULL);
 452
 453         sprintf(buffer, "#%02X%02X%02X",
 454                 ((val & 0xff0000) >> 16),
 455                 ((val & 0x00ff00) >> 8),
 456                 (val & 0x0000ff)
 457         );
 458 }
 459
 460 /* Internal function: parses a GdkColor to a glk color */
 461 static glui32
 462 color_parse_gdk(GdkColor *color)
 463 {
 464         g_return_val_if_fail(color != NULL, 0);
 465         return (glui32) color->pixel;
 466 }
 467
 468 /* Internal function: changes a GTK tag to correspond with the given style. */
 469 static void
 470 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 471 {
 472         g_return_if_fail(tag != NULL);
 473
 474         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 475         GObject *tag_object = G_OBJECT(tag);
 476         gint reverse_color = 0;
 477
 478         /* FIXME where should we keep track of this?
 479         g_object_get(tag, "reverse_color", &reverse_color, NULL);
 480         */
 481
 482         int i = 0;
 483         gchar color[20];
 484         switch(hint) {
 485         case stylehint_Indentation:
 486                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 487                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 488                 break;
 489
 490         case stylehint_ParaIndentation:
 491                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 492                 break;
 493
 494         case stylehint_Justification:
 495                 switch(val) {
 496                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 497                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 498                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 499                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 500                         default:
 501                                 WARNING("Unknown justification");
 502                                 i = GTK_JUSTIFY_LEFT;
 503                 }
 504                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 505                 break;
 506
 507         case stylehint_Weight:
 508                 switch(val) {
 509                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 510                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 511                         case  1: i = PANGO_WEIGHT_BOLD; break;
 512                         default: WARNING("Unknown font weight");
 513                 }
 514                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 515                 break;
 516
 517         case stylehint_Size:
 518                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 519                 break;
 520
 521         case stylehint_Oblique:
 522                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 523                 break;
 524
 525         case stylehint_Proportional:
 526                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 527                 break;
 528
 529         case stylehint_TextColor:
 530                 color_format(val, color);
 531
 532                 if(!reverse_color)
 533                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 534                 else
 535                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 536
 537                 break;
 538
 539         case stylehint_BackColor:
 540                 color_format(val, color);
 541
 542                 if(!reverse_color)
 543                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 544                 else
 545                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 546
 547                 break;
 548
 549         case stylehint_ReverseColor:
 550                 if(reverse_color != val) {
 551                         /* Flip the fore- and background colors */
 552                         GdkColor* foreground_color;
 553                         GdkColor* background_color;
 554                         gint f_set, b_set = 0;
 555                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 556
 557                         if(f_set)
 558                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 559                         if(b_set)
 560                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 561
 562                         if(b_set)
 563                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 564                         else
 565                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 566
 567                         if(f_set)
 568                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 569                         else
 570                                 g_object_set(tag_object, "background", "#000000", NULL);
 571                 }
 572                 break;
 573
 574         default:
 575                 WARNING("Unknown style hint");
 576         }
 577 }
 578 /*Internal function: queries a text tag for the value of a given style hint */
 579 static gint
 580 query_tag(GtkTextTag *tag, glui32 hint)
 581 {
 582         gint intval;
 583         GObject *objval;
 584         GdkColor *colval;
 585
 586         g_return_val_if_fail(tag != NULL, 0);
 587
 588         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 589
 590         switch(hint) {
 591         case stylehint_Indentation:
 592                 g_object_get(tag, "left_margin", &intval, NULL);
 593                 return intval/5;
 594                 break;
 595
 596         case stylehint_ParaIndentation:
 597                 g_object_get(tag, "indent", &intval, NULL);
 598                 return intval/5;
 599                 break;
 600
 601         case stylehint_Justification:
 602                 g_object_get(tag, "justification", &intval, NULL);
 603                 switch(intval) {
 604                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 605                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 606                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 607                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 608                         default:
 609                                 WARNING("Unknown justification");
 610                                 return stylehint_just_LeftFlush;
 611                 }
 612                 break;
 613
 614         case stylehint_Weight:
 615                 g_object_get(tag, "weight", &intval, NULL);
 616                 switch(intval) {
 617                         case PANGO_WEIGHT_LIGHT: return -1; break;
 618                         case PANGO_WEIGHT_NORMAL: return 0; break;
 619                         case PANGO_WEIGHT_BOLD: return 1; break;
 620                         default: WARNING("Unknown font weight"); return 0;
 621                 }
 622                 break;
 623
 624         case stylehint_Size:
 625                 g_object_get(tag, "size", &intval, NULL);
 626                 return (intval/2)-14;
 627                 break;
 628
 629         case stylehint_Oblique:
 630                 g_object_get(tag, "style", &intval , NULL);
 631                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 632                 break;
 633
 634         case stylehint_Proportional:
 635                 g_object_get(tag, "font-desc", &objval, NULL);
 636                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 637                 break;
 638
 639         case stylehint_TextColor:
 640                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 641                 return color_parse_gdk(colval);
 642                 break;
 643
 644         case stylehint_BackColor:
 645                 g_object_get(tag, "background-gdk", &colval, NULL);
 646                 return color_parse_gdk(colval);
 647                 break;
 648
 649         case stylehint_ReverseColor:
 650                 /* FIXME: implement this */
 651                 return 0;
 652                 break;
 653
 654         default:
 655                 WARNING("Unknown style hint");
 656         }
 657
 658         return 0;
 659 }
 660
 661 /**
 662  * glk_stylehint_set:
 663  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 664  * @styl: The style to set a hint for.
 665  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 666  * @val: The style hint. The meaning of this depends on @hint.
 667  *
 668  * Sets a hint about the appearance of one style for a particular type of
 669  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 670  * all types of window.
 671  * <note><para>
 672  *  There is no equivalent constant to set a hint for all styles of a single
 673  *  window type.
 674  * </para></note>
 675  */
 676 void
 677 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 678 {
 679         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 680
 681         if( G_UNLIKELY(!chimara_style_initialized) ) {
 682                 style_init();
 683         }
 684
 685         GtkTextTag *to_change;
 686         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 687                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 688                 apply_stylehint_to_tag(to_change, hint, val);
 689         }
 690
 691         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 692                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 693                 apply_stylehint_to_tag(to_change, hint, val);
 694         }
 695 }
 696
 697 void
 698 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 699 {
 700         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 701         GtkTextTag *tag;
 702
 703         switch(wintype) {
 704         case wintype_TextBuffer:
 705                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 706                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 707                 break;
 708         case wintype_TextGrid:
 709                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 710                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 711         default:
 712                 return;
 713         }
 714 }
 715
 716 glui32
 717 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 718 {
 719         return styl1 != styl2;
 720 }
 721
 722 glui32
 723 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 724 {
 725         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 726         GtkTextTag *tag;
 727
 728         switch(win->type) {
 729         case wintype_TextBuffer:
 730                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 731                 *result = query_tag(tag, hint);
 732                 break;
 733         case wintype_TextGrid:
 734                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 735                 *result = query_tag(tag, hint);
 736         default:
 737                 return FALSE;
 738         }
 739
 740         return TRUE;
 741 }