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 GtkTextTag* gtk_text_tag_copy(GtkTextTag *tag);
  19
  20 /**
  21  * glk_set_style:
  22  * @styl: The style to apply
  23  *
  24  * Changes the style of the current output stream. @styl should be one of the
  25  * <code>style_</code> constants listed above. However, any value is actually
  26  * legal; if the interpreter does not recognize the style value, it will treat
  27  * it as %style_Normal.
  28  * <note><para>
  29  *  This policy allows for the future definition of styles without breaking old
  30  *  Glk libraries.
  31  * </para></note>
  32  */
  33 void
  34 glk_set_style(glui32 styl)
  35 {
  36         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  37         g_return_if_fail(glk_data->current_stream != NULL);
  38         glk_set_style_stream(glk_data->current_stream, styl);
  39 }
  40
  41 static const gchar* TAG_NAMES[] = {
  42         "normal",
  43         "emphasized",
  44         "preformatted",
  45         "header",
  46         "subheader",
  47         "alert",
  48         "note",
  49         "block-quote",
  50         "input",
  51         "user1",
  52         "user2"
  53 };
  54
  55 /* Internal function: mapping from style enum to tag name */
  56 static gchar*
  57 get_tag_name(glui32 style)
  58 {
  59         if(style >= style_NUMSTYLES) {
  60                 WARNING("Unsupported style");
  61                 return "normal";
  62         } else {
  63                 return (gchar*) TAG_NAMES[style];
  64         }
  65 }
  66
  67 /**
  68  * glk_set_style_stream:
  69  * @str: Output stream to change the style of
  70  * @styl: The style to apply
  71  *
  72  * This changes the style of the stream @str. See glk_set_style().
  73  */
  74 void
  75 glk_set_style_stream(strid_t str, glui32 styl) {
  76         if(str->window == NULL)
  77                 return;
  78
  79         flush_window_buffer(str->window);
  80         str->style = get_tag_name(styl);
  81 }
  82
  83 /* Internal function: call this to initialize the default styles to a textbuffer. */
  84 void
  85 style_init_textbuffer(GtkTextBuffer *buffer)
  86 {
  87         g_return_if_fail(buffer != NULL);
  88
  89         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
  90         if( G_UNLIKELY(!glk_data->style_initialized) ) {
  91                 style_init();
  92         }
  93
  94         /* Copy the current text tags to the textbuffer's tag table */
  95         g_hash_table_foreach(glk_data->current_styles->text_buffer, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
  96 }
  97
  98 /* Internal function: call this to initialize the default styles to a textgrid. */
  99 void
 100 style_init_textgrid(GtkTextBuffer *buffer)
 101 {
 102         g_return_if_fail(buffer != NULL);
 103
 104         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 105         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 106                 style_init();
 107         }
 108
 109         /* Copy the current text tags to the textgrid's tag table */
 110         g_hash_table_foreach(glk_data->current_styles->text_grid, style_add_tag_to_textbuffer, gtk_text_buffer_get_tag_table(buffer));
 111 }
 112
 113 /* Internal function used to iterate over the default text tag table, applying them to a textbuffer */
 114 static void
 115 style_add_tag_to_textbuffer(gpointer key, gpointer tag, gpointer tag_table)
 116 {
 117         gtk_text_tag_table_add( tag_table, gtk_text_tag_copy(tag) );
 118 }
 119
 120 /* Internal function used to iterate over a style table, copying it */
 121 static void
 122 style_table_copy(gpointer key, gpointer tag, gpointer target_table)
 123 {
 124         g_return_if_fail(key != NULL);
 125         g_return_if_fail(tag != NULL);
 126         g_return_if_fail(target_table != NULL);
 127
 128         g_hash_table_insert(target_table, key, gtk_text_tag_copy( GTK_TEXT_TAG(tag) ));
 129 }
 130
 131 /* Internal function that copies a text tag */
 132 GtkTextTag*
 133 gtk_text_tag_copy(GtkTextTag *tag)
 134 {
 135         GtkTextTag *copy;
 136
 137         g_return_val_if_fail(tag != NULL, NULL);
 138
 139         copy = gtk_text_tag_new(tag->name);
 140         gtk_text_attributes_copy_values(tag->values, copy->values);
 141
 142         #define _COPY_FLAG(flag) copy->flag = tag->flag
 143                 _COPY_FLAG (bg_color_set);
 144                 _COPY_FLAG (bg_color_set);
 145                 _COPY_FLAG (bg_stipple_set);
 146                 _COPY_FLAG (fg_color_set);
 147                 _COPY_FLAG (fg_stipple_set);
 148                 _COPY_FLAG (justification_set);
 149                 _COPY_FLAG (left_margin_set);
 150                 _COPY_FLAG (indent_set);
 151                 _COPY_FLAG (rise_set);
 152                 _COPY_FLAG (strikethrough_set);
 153                 _COPY_FLAG (right_margin_set);
 154                 _COPY_FLAG (pixels_above_lines_set);
 155                 _COPY_FLAG (pixels_below_lines_set);
 156                 _COPY_FLAG (pixels_inside_wrap_set);
 157                 _COPY_FLAG (tabs_set);
 158                 _COPY_FLAG (underline_set);
 159                 _COPY_FLAG (wrap_mode_set);
 160                 _COPY_FLAG (bg_full_height_set);
 161                 _COPY_FLAG (invisible_set);
 162                 _COPY_FLAG (editable_set);
 163                 _COPY_FLAG (language_set);
 164         #undef _COPY_FLAG
 165
 166         /* Copy the data that was added manually */
 167         gpointer reverse_color = g_object_get_data( G_OBJECT(tag), "reverse_color" );
 168
 169         if(reverse_color)
 170                 g_object_set_data( G_OBJECT(copy), "reverse_color", reverse_color );
 171
 172         return copy;
 173 }
 174
 175 /* Internal function that reads the default styles from a CSS file */
 176 void
 177 style_init()
 178 {
 179         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 180         GHashTable *default_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 181         GHashTable *default_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 182         GHashTable *current_text_grid_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 183         GHashTable *current_text_buffer_styles = g_hash_table_new_full(g_str_hash, g_str_equal, NULL, g_object_unref);
 184         GtkTextTag *tag;
 185
 186         /* Initialise the default styles for a text grid */
 187         tag = gtk_text_tag_new("normal");
 188         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 189         g_hash_table_insert(default_text_grid_styles, "normal", tag);
 190
 191         tag = gtk_text_tag_new("emphasized");
 192         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 193         g_hash_table_insert(default_text_grid_styles, "emphasized", tag);
 194
 195         tag = gtk_text_tag_new("preformatted");
 196         g_object_set(tag, "font-desc", glk_data->monospace_font_desc, NULL);
 197         g_hash_table_insert(default_text_grid_styles, "preformatted", tag);
 198
 199         tag = gtk_text_tag_new("header");
 200         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 201         g_hash_table_insert(default_text_grid_styles, "header", tag);
 202
 203         tag = gtk_text_tag_new("subheader");
 204         g_object_set(tag, "weight", PANGO_WEIGHT_BOLD, NULL);
 205         g_hash_table_insert(default_text_grid_styles, "subheader", tag);
 206
 207         tag = gtk_text_tag_new("alert");
 208         g_object_set(tag, "foreground", "#aa0000", "weight", PANGO_WEIGHT_BOLD, NULL);
 209         g_hash_table_insert(default_text_grid_styles, "alert", tag);
 210
 211         tag = gtk_text_tag_new("note");
 212         g_object_set(tag, "foreground", "#aaaa00", "weight", PANGO_WEIGHT_BOLD, NULL);
 213         g_hash_table_insert(default_text_grid_styles, "note", tag);
 214
 215         tag = gtk_text_tag_new("block-quote");
 216         g_object_set(tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 217         g_hash_table_insert(default_text_grid_styles, "block-quote", tag);
 218
 219         g_hash_table_insert(default_text_grid_styles, "input", gtk_text_tag_new("input"));
 220         g_hash_table_insert(default_text_grid_styles, "user1", gtk_text_tag_new("user1"));
 221         g_hash_table_insert(default_text_grid_styles, "user2", gtk_text_tag_new("user2"));
 222
 223         tag = gtk_text_tag_new("hyperlink");
 224         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 225         g_hash_table_insert(default_text_grid_styles, "hyperlink", tag);
 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, "style-set", TRUE, 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         tag = gtk_text_tag_new("hyperlink");
 265         g_object_set(tag, "foreground", "#0000ff", "underline", PANGO_UNDERLINE_SINGLE, "underline-set", TRUE, NULL);
 266         g_hash_table_insert(default_text_buffer_styles, "hyperlink", tag);
 267
 268         glk_data->default_styles->text_grid = default_text_grid_styles;
 269         glk_data->default_styles->text_buffer = default_text_buffer_styles;
 270
 271         /* Create the CSS file scanner */
 272         GScanner *scanner = g_scanner_new(NULL);
 273
 274         int f = open(glk_data->css_file, O_RDONLY);
 275         if(f != -1)
 276         {
 277                 g_scanner_input_file(scanner, f);
 278                 scanner->input_name = glk_data->css_file;
 279                 scanner->config->cset_identifier_first = G_CSET_a_2_z G_CSET_A_2_Z "#";
 280                 scanner->config->cset_identifier_nth = G_CSET_a_2_z G_CSET_A_2_Z "-_" G_CSET_DIGITS;
 281                 scanner->config->symbol_2_token = TRUE;
 282                 scanner->config->cpair_comment_single = NULL;
 283                 scanner->config->scan_float = FALSE;
 284
 285                 /* Run the scanner over the CSS file, overriding defaults */
 286                 while( g_scanner_peek_next_token(scanner) != G_TOKEN_EOF) {
 287                         if( !style_accept_style_selector(scanner) )
 288                                 break;
 289                 }
 290
 291                 g_scanner_destroy(scanner);
 292         }
 293         else
 294                 g_warning("Could not find CSS file");
 295
 296         /* Set the current style to a copy of the default style */
 297         g_hash_table_foreach(default_text_grid_styles, style_table_copy, current_text_grid_styles);
 298         g_hash_table_foreach(default_text_buffer_styles, style_table_copy, current_text_buffer_styles);
 299         glk_data->current_styles->text_grid = current_text_grid_styles;
 300         glk_data->current_styles->text_buffer = current_text_buffer_styles;
 301
 302         glk_data->style_initialized = TRUE;
 303 }
 304
 305 /* Internal function: parses a token */
 306 static gboolean
 307 style_accept(GScanner *scanner, GTokenType token)
 308 {
 309         GTokenType next = g_scanner_get_next_token(scanner);
 310         if(next != token ) {
 311                 g_scanner_unexp_token(scanner, token, NULL, NULL, NULL, "CSS Error", 1);
 312                 return FALSE;
 313         } else {
 314                 return TRUE;
 315         }
 316 }
 317
 318 /* Internal function: parses a style selector */
 319 static gboolean
 320 style_accept_style_selector(GScanner *scanner)
 321 {
 322         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 323
 324         GtkTextTag *current_tag;
 325         gchar *field;
 326         GTokenType token = g_scanner_get_next_token(scanner);
 327         GTokenValue value = g_scanner_cur_value(scanner);
 328
 329         if(
 330                 token != G_TOKEN_IDENTIFIER ||
 331                 ( strcmp(value.v_identifier, "buffer") && strcmp(value.v_identifier, "grid") )
 332         ) {
 333                 g_scanner_error(scanner, "CSS Error: buffer/grid expected");
 334                 return FALSE;
 335         }
 336
 337         field = g_strdup(value.v_identifier);
 338
 339         if( !style_accept(scanner, '.') )
 340                 return FALSE;
 341
 342         token = g_scanner_get_next_token(scanner);
 343         value = g_scanner_cur_value(scanner);
 344
 345         if(token != G_TOKEN_IDENTIFIER) {
 346                 g_scanner_error(scanner, "CSS Error: style selector expected");
 347                 return FALSE;
 348         }
 349
 350         if( !strcmp(field, "buffer") )
 351                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_buffer, value.v_identifier);
 352         else
 353                 current_tag = g_hash_table_lookup(glk_data->default_styles->text_grid, value.v_identifier);
 354
 355         if(current_tag == NULL) {
 356                 g_scanner_error(scanner, "CSS Error: invalid style identifier");
 357                 return FALSE;
 358         }
 359
 360         if( !style_accept(scanner, '{') )
 361                 return FALSE;
 362
 363         while( g_scanner_peek_next_token(scanner) != '}') {
 364                 if( !style_accept_style_hint(scanner, current_tag) )
 365                         return FALSE;
 366         }
 367
 368         if( !style_accept(scanner, '}') )
 369                 return FALSE;
 370
 371         return TRUE;
 372 }
 373
 374 /* Internal function: parses a style hint */
 375 static gboolean
 376 style_accept_style_hint(GScanner *scanner, GtkTextTag *current_tag)
 377 {
 378         GTokenType token = g_scanner_get_next_token(scanner);
 379         GTokenValue value = g_scanner_cur_value(scanner);
 380         gchar *hint;
 381
 382         if(token != G_TOKEN_IDENTIFIER) {
 383                 g_scanner_error(scanner, "CSS Error: style hint expected");
 384                 return FALSE;
 385         }
 386
 387         hint = g_strdup(value.v_identifier);
 388
 389         if( !style_accept(scanner, ':') )
 390                 return FALSE;
 391
 392         token = g_scanner_get_next_token(scanner);
 393         value = g_scanner_cur_value(scanner);
 394
 395         if( !strcmp(hint, "font-family") ) {
 396                 if(token != G_TOKEN_STRING) {
 397                         g_scanner_error(scanner, "CSS Error: string expected");
 398                         return FALSE;
 399                 }
 400                 g_object_set(current_tag, "family", value.v_string, "family-set", TRUE, NULL);
 401         }
 402         else if( !strcmp(hint, "font-weight") ) {
 403                 if(token != G_TOKEN_IDENTIFIER) {
 404                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 405                         return FALSE;
 406                 }
 407
 408                 if( !strcmp(value.v_identifier, "bold") )
 409                         g_object_set(current_tag, "weight", PANGO_WEIGHT_BOLD, "weight-set", TRUE, NULL);
 410                 else if( !strcmp(value.v_identifier, "normal") )
 411                         g_object_set(current_tag, "weight", PANGO_WEIGHT_NORMAL, "weight-set", TRUE, NULL);
 412                 else {
 413                         g_scanner_error(scanner, "CSS Error: bold/normal expected");
 414                         return FALSE;
 415                 }
 416         }
 417         else if( !strcmp(hint, "font-style") ) {
 418                 if(token != G_TOKEN_IDENTIFIER) {
 419                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 420                         return FALSE;
 421                 }
 422
 423                 if( !strcmp(value.v_identifier, "italic") )
 424                         g_object_set(current_tag, "style", PANGO_STYLE_ITALIC, "style-set", TRUE, NULL);
 425                 else if( !strcmp(value.v_identifier, "normal") )
 426                         g_object_set(current_tag, "style", PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 427                 else {
 428                         g_scanner_error(scanner, "CSS Error: italic/normal expected");
 429                         return FALSE;
 430                 }
 431         }
 432         else if( !strcmp(hint, "font-size") ) {
 433                 if(token == G_TOKEN_INT)
 434                         g_object_set(current_tag, "size-points", (float)value.v_int, "size-set", TRUE, NULL);
 435                 else if(token == G_TOKEN_FLOAT)
 436                         g_object_set(current_tag, "size-points", value.v_float, "size-set", TRUE, NULL);
 437                 else {
 438                         g_scanner_error(scanner, "CSS Error: integer or float expected");
 439                         return FALSE;
 440                 }
 441         }
 442         else if( !strcmp(hint, "color") ) {
 443                 if(token != G_TOKEN_IDENTIFIER) {
 444                         g_scanner_error(scanner, "CSS Error: hex color expected");
 445                         return FALSE;
 446                 }
 447
 448                 g_object_set(current_tag, "foreground", value.v_identifier, "foreground-set", TRUE, NULL);
 449         }
 450         else if( !strcmp(hint, "background-color") ) {
 451                 if(token != G_TOKEN_IDENTIFIER) {
 452                         g_scanner_error(scanner, "CSS Error: hex color expected");
 453                         return FALSE;
 454                 }
 455                 g_object_set(current_tag, "background", value.v_identifier, "background-set", TRUE, NULL);
 456         }
 457         else if( !strcmp(hint, "text-align") ) {
 458                 if(token != G_TOKEN_IDENTIFIER) {
 459                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 460                         return FALSE;
 461                 }
 462
 463                 if( !strcmp(value.v_identifier, "left") )
 464                         g_object_set(current_tag, "justification", GTK_JUSTIFY_LEFT, "justification-set", TRUE, NULL);
 465                 else if( !strcmp(value.v_identifier, "right") )
 466                         g_object_set(current_tag, "justification", GTK_JUSTIFY_RIGHT, "justification-set", TRUE, NULL);
 467                 else if( !strcmp(value.v_identifier, "center") )
 468                         g_object_set(current_tag, "justification", GTK_JUSTIFY_CENTER, "justification-set", TRUE, NULL);
 469                 else {
 470                         g_scanner_error(scanner, "CSS Error: left/right/center expected");
 471                         return FALSE;
 472                 }
 473         }
 474         else if( !strcmp(hint, "margin-left") ) {
 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, "left-margin", value.v_int, "left-margin-set", TRUE, NULL);
 480         }
 481         else if( !strcmp(hint, "margin-right") ) {
 482                 if(token != G_TOKEN_INT) {
 483                         g_scanner_error(scanner, "CSS Error: integer expected");
 484                         return FALSE;
 485                 }
 486                 g_object_set(current_tag, "right-margin", value.v_int, "right-margin-set", TRUE, NULL);
 487         }
 488         else if( !strcmp(hint, "margin-top") ) {
 489                 if(token != G_TOKEN_INT) {
 490                         g_scanner_error(scanner, "CSS Error: integer expected");
 491                         return FALSE;
 492                 }
 493                 g_object_set(current_tag, "pixels-above-lines", value.v_int, "pixels-above-lines-set", TRUE, NULL);
 494         }
 495         else if( !strcmp(hint, "margin-bottom") ) {
 496                 if(token != G_TOKEN_INT) {
 497                         g_scanner_error(scanner, "CSS Error: integer expected");
 498                         return FALSE;
 499                 }
 500                 g_object_set(current_tag, "pixels-below-lines", value.v_int, "pixels-below-lines-set", TRUE, NULL);
 501         }
 502
 503         else {
 504                 g_scanner_error(scanner, "CSS Error: invalid style hint %s", hint);
 505                 return FALSE;
 506         }
 507
 508         if( !style_accept(scanner, ';') )
 509                 return FALSE;
 510
 511         return TRUE;
 512 }
 513
 514 /* Internal function: parses a glk color to a #hex-value */
 515 static void
 516 glkcolor_to_hex(glui32 val, gchar *buffer)
 517 {
 518         g_return_if_fail(buffer != NULL);
 519
 520         sprintf(buffer, "#%02X%02X%02X",
 521                 ((val & 0xff0000) >> 16),
 522                 ((val & 0x00ff00) >> 8),
 523                 (val & 0x0000ff)
 524         );
 525 }
 526
 527 /* Internal function: parses a glk color to a GdkColor */
 528 GdkColor*
 529 glkcolor_to_gdkcolor(glui32 val)
 530 {
 531         GdkColor* color = g_new0(GdkColor, 1);
 532         color->red = (val & 0xff0000) >> 16;
 533         color->green = (val & 0x00ff00) >> 8;
 534         color->blue = val & 0x0000ff;
 535
 536         return color;
 537 }
 538
 539 /* Internal function: parses a GdkColor to a glk color */
 540 static glui32
 541 gdkcolor_to_glkcolor(GdkColor *color)
 542 {
 543         g_return_val_if_fail(color != NULL, 0);
 544         return (glui32) color->pixel;
 545 }
 546
 547 /* Internal function: changes a GTK tag to correspond with the given style. */
 548 static void
 549 apply_stylehint_to_tag(GtkTextTag *tag, glui32 hint, glsi32 val)
 550 {
 551         g_return_if_fail(tag != NULL);
 552
 553         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 554         GObject *tag_object = G_OBJECT(tag);
 555
 556         gint reverse_color = GPOINTER_TO_INT( g_object_get_data(tag_object, "reverse-color") );
 557
 558         int i = 0;
 559         gchar color[20];
 560         switch(hint) {
 561         case stylehint_Indentation:
 562                 g_object_set(tag_object, "left-margin", 5*val, "left-margin-set", TRUE, NULL);
 563                 g_object_set(tag_object, "right-margin", 5*val, "right-margin-set", TRUE, NULL);
 564                 break;
 565
 566         case stylehint_ParaIndentation:
 567                 g_object_set(tag_object, "indent", 5*val, "indent-set", TRUE, NULL);
 568                 break;
 569
 570         case stylehint_Justification:
 571                 switch(val) {
 572                         case stylehint_just_LeftFlush:  i = GTK_JUSTIFY_LEFT; break;
 573                         case stylehint_just_LeftRight:  i = GTK_JUSTIFY_FILL; break;
 574                         case stylehint_just_Centered:   i = GTK_JUSTIFY_CENTER; break;
 575                         case stylehint_just_RightFlush: i = GTK_JUSTIFY_RIGHT; break;
 576                         default:
 577                                 WARNING("Unknown justification");
 578                                 i = GTK_JUSTIFY_LEFT;
 579                 }
 580                 g_object_set(tag_object, "justification", i, "justification-set", TRUE, NULL);
 581                 break;
 582
 583         case stylehint_Weight:
 584                 switch(val) {
 585                         case -1: i = PANGO_WEIGHT_LIGHT; break;
 586                         case  0: i = PANGO_WEIGHT_NORMAL; break;
 587                         case  1: i = PANGO_WEIGHT_BOLD; break;
 588                         default: WARNING("Unknown font weight");
 589                 }
 590                 g_object_set(tag_object, "weight", i, "weight-set", TRUE, NULL);
 591                 break;
 592
 593         case stylehint_Size:
 594                 g_object_set(tag_object, "size", 14+(2*val), "size-set", TRUE, NULL);
 595                 break;
 596
 597         case stylehint_Oblique:
 598                 g_object_set(tag_object, "style", val ? PANGO_STYLE_ITALIC : PANGO_STYLE_NORMAL, "style-set", TRUE, NULL);
 599                 break;
 600
 601         case stylehint_Proportional:
 602                 g_object_set(tag_object, "font-desc", val ? glk_data->default_font_desc : glk_data->monospace_font_desc, NULL);
 603                 break;
 604
 605         case stylehint_TextColor:
 606                 glkcolor_to_hex(val, color);
 607
 608                 if(!reverse_color)
 609                         g_object_set(tag_object, "foreground", color, "foreground-set", TRUE, NULL);
 610                 else
 611                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 612
 613                 break;
 614
 615         case stylehint_BackColor:
 616                 glkcolor_to_hex(val, color);
 617
 618                 if(!reverse_color)
 619                         g_object_set(tag_object, "background", color, "background-set", TRUE, NULL);
 620                 else
 621                         g_object_set(tag_object, "foreground", color, "background-set", TRUE, NULL);
 622
 623                 break;
 624
 625         case stylehint_ReverseColor:
 626                 if(reverse_color != val) {
 627                         /* Flip the fore- and background colors */
 628                         GdkColor* foreground_color;
 629                         GdkColor* background_color;
 630                         gint f_set, b_set = 0;
 631                         g_object_get(tag_object, "foreground-set", &f_set, "background-set", &b_set, NULL);
 632
 633                         if(f_set)
 634                                 g_object_get(tag_object, "foreground-gdk", &foreground_color, NULL);
 635                         if(b_set)
 636                                 g_object_get(tag_object, "background-gdk", &background_color, NULL);
 637
 638                         if(b_set)
 639                                 g_object_set(tag_object, "foreground-gdk", background_color, NULL);
 640                         else
 641                                 g_object_set(tag_object, "foreground", "#ffffff", NULL);
 642
 643                         if(f_set)
 644                                 g_object_set(tag_object, "background-gdk", foreground_color, NULL);
 645                         else
 646                                 g_object_set(tag_object, "background", "#000000", NULL);
 647
 648                         g_object_set_data( tag_object, "reverse-color", GINT_TO_POINTER(val != 0) );
 649                 }
 650                 break;
 651
 652         default:
 653                 WARNING("Unknown style hint");
 654         }
 655 }
 656 /*Internal function: queries a text tag for the value of a given style hint */
 657 static gint
 658 query_tag(GtkTextTag *tag, glui32 hint)
 659 {
 660         gint intval;
 661         GObject *objval;
 662         GdkColor *colval;
 663
 664         g_return_val_if_fail(tag != NULL, 0);
 665
 666         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 667
 668         switch(hint) {
 669         case stylehint_Indentation:
 670                 g_object_get(tag, "left_margin", &intval, NULL);
 671                 return intval/5;
 672                 break;
 673
 674         case stylehint_ParaIndentation:
 675                 g_object_get(tag, "indent", &intval, NULL);
 676                 return intval/5;
 677                 break;
 678
 679         case stylehint_Justification:
 680                 g_object_get(tag, "justification", &intval, NULL);
 681                 switch(intval) {
 682                         case GTK_JUSTIFY_LEFT: return stylehint_just_LeftFlush; break;
 683                         case GTK_JUSTIFY_FILL: return stylehint_just_LeftRight; break;
 684                         case GTK_JUSTIFY_CENTER: return stylehint_just_Centered; break;
 685                         case GTK_JUSTIFY_RIGHT: return stylehint_just_RightFlush; break;
 686                         default:
 687                                 WARNING("Unknown justification");
 688                                 return stylehint_just_LeftFlush;
 689                 }
 690                 break;
 691
 692         case stylehint_Weight:
 693                 g_object_get(tag, "weight", &intval, NULL);
 694                 switch(intval) {
 695                         case PANGO_WEIGHT_LIGHT: return -1; break;
 696                         case PANGO_WEIGHT_NORMAL: return 0; break;
 697                         case PANGO_WEIGHT_BOLD: return 1; break;
 698                         default: WARNING("Unknown font weight"); return 0;
 699                 }
 700                 break;
 701
 702         case stylehint_Size:
 703                 g_object_get(tag, "size", &intval, NULL);
 704                 return (intval/2)-14;
 705                 break;
 706
 707         case stylehint_Oblique:
 708                 g_object_get(tag, "style", &intval , NULL);
 709                 return intval == PANGO_STYLE_ITALIC ? 1 : 0;
 710                 break;
 711
 712         case stylehint_Proportional:
 713                 g_object_get(tag, "font-desc", &objval, NULL);
 714                 return objval == (GObject *)glk_data->monospace_font_desc ? 0 : 1;
 715                 break;
 716
 717         case stylehint_TextColor:
 718                 g_object_get(tag, "foreground-gdk", &colval, NULL);
 719                 return gdkcolor_to_glkcolor(colval);
 720                 break;
 721
 722         case stylehint_BackColor:
 723                 g_object_get(tag, "background-gdk", &colval, NULL);
 724                 return gdkcolor_to_glkcolor(colval);
 725                 break;
 726
 727         case stylehint_ReverseColor:
 728                 return GPOINTER_TO_INT( g_object_get_data(G_OBJECT(tag), "reverse_color") );
 729                 break;
 730
 731         default:
 732                 WARNING("Unknown style hint");
 733         }
 734
 735         return 0;
 736 }
 737
 738 /**
 739  * glk_stylehint_set:
 740  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 741  * @styl: The style to set a hint for.
 742  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 743  * @val: The style hint. The meaning of this depends on @hint.
 744  *
 745  * Sets a hint about the appearance of one style for a particular type of
 746  * window. You can also set wintype to %wintype_AllTypes, which sets a hint for
 747  * all types of window.
 748  * <note><para>
 749  *  There is no equivalent constant to set a hint for all styles of a single
 750  *  window type.
 751  * </para></note>
 752  */
 753 void
 754 glk_stylehint_set(glui32 wintype, glui32 styl, glui32 hint, glsi32 val)
 755 {
 756         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 757
 758         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 759                 style_init();
 760         }
 761
 762         GtkTextTag *to_change;
 763         if(wintype == wintype_TextBuffer || wintype == wintype_AllTypes) {
 764                 to_change = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 765                 apply_stylehint_to_tag(to_change, hint, val);
 766         }
 767
 768         if(wintype == wintype_TextGrid || wintype == wintype_AllTypes) {
 769                 to_change = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 770                 apply_stylehint_to_tag(to_change, hint, val);
 771         }
 772 }
 773
 774 /**
 775  * glk_stylehint_clear:
 776  * @wintype: The window type to set a style hint on, or %wintype_AllTypes.
 777  * @styl: The style to set a hint for.
 778  * @hint: The type of style hint, one of the <code>stylehint_</code> constants.
 779  *
 780  * Resets a hint about the appearance of one style for a particular type of
 781  * window to it's default value. You can also set wintype to %wintype_AllTypes, which resets a hint for
 782  * all types of window.
 783  * <note><para>
 784  *  There is no equivalent constant to reset a hint for all styles of a single
 785  *  window type.
 786  * </para></note>
 787  */
 788 void
 789 glk_stylehint_clear(glui32 wintype, glui32 styl, glui32 hint)
 790 {
 791         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 792         GtkTextTag *tag;
 793
 794         switch(wintype) {
 795         case wintype_TextBuffer:
 796                 tag = g_hash_table_lookup( glk_data->default_styles->text_buffer, get_tag_name(styl) );
 797                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 798                 break;
 799         case wintype_TextGrid:
 800                 tag = g_hash_table_lookup( glk_data->default_styles->text_grid, get_tag_name(styl) );
 801                 glk_stylehint_set( wintype, styl, hint, query_tag(tag, hint) );
 802         default:
 803                 return;
 804         }
 805 }
 806
 807 /**
 808  * glk_style_distinguish:
 809  * @win: The window in which the styles are to be distinguished.
 810  * @styl1: The first style to be distinguished from the second style.
 811  * @styl2: The second styel to be distinguished from the first style.
 812  *
 813  * Returns: TRUE if the two styles are visually distinguishable in the given window.
 814  * If they are not, it returns FALSE.
 815  */
 816 glui32
 817 glk_style_distinguish(winid_t win, glui32 styl1, glui32 styl2)
 818 {
 819         return styl1 != styl2;
 820 }
 821
 822 /**
 823  * glk_style_measure:
 824  * @win: The window from which to take the style.
 825  * @styl: The style to perform the measurement on.
 826  * @hint: The stylehint to measure.
 827  * @result: Address to write the result to.
 828  *
 829  * This function can be used to query the current value of a particular style hint.
 830  * Returns: TRUE upon successul retrievel, otherwise FALSE.
 831  */
 832 glui32
 833 glk_style_measure(winid_t win, glui32 styl, glui32 hint, glui32 *result)
 834 {
 835         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 836         GtkTextTag *tag;
 837
 838         switch(win->type) {
 839         case wintype_TextBuffer:
 840                 tag = g_hash_table_lookup( glk_data->current_styles->text_buffer, get_tag_name(styl) );
 841                 *result = query_tag(tag, hint);
 842                 break;
 843         case wintype_TextGrid:
 844                 tag = g_hash_table_lookup( glk_data->current_styles->text_grid, get_tag_name(styl) );
 845                 *result = query_tag(tag, hint);
 846         default:
 847                 return FALSE;
 848         }
 849
 850         return TRUE;
 851 }
 852
 853 /* Internal function returning the current default font for a window type
 854  * This can be used later for size calculations. Only wintype_TextGrid and wintype_TextBuffer are
 855  * supported for now */
 856 PangoFontDescription*
 857 get_current_font(guint32 wintype)
 858 {
 859         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
 860         GtkTextTag *normal;
 861
 862         if( G_UNLIKELY(!glk_data->style_initialized) ) {
 863                 style_init();
 864         }
 865
 866         switch(wintype) {
 867         case wintype_TextGrid:
 868                 normal = g_hash_table_lookup(glk_data->current_styles->text_grid, "normal");
 869                 break;
 870         case wintype_TextBuffer:
 871                 normal = g_hash_table_lookup(glk_data->current_styles->text_buffer, "normal");
 872                 break;
 873         default:
 874                 return NULL;
 875         }
 876
 877         PangoFontDescription *font;
 878         g_object_get( G_OBJECT(normal), "font-desc", &font, NULL );
 879
 880         return font;
 881 }