src/lib/engines/common/evas_font_ot.c

   1 #include "evas_font_ot.h"
   2
   3 #ifdef USE_HARFBUZZ
   4 # include <hb.h>
   5 # include <hb-ft.h>
   6 #endif
   7
   8 #include "evas_common.h"
   9
  10 #include <Eina.h>
  11 #include "evas_font_private.h"
  12
  13 #ifdef USE_HARFBUZZ
  14 static const hb_script_t
  15 _evas_script_to_harfbuzz[] =
  16 {
  17   HB_SCRIPT_COMMON,
  18   HB_SCRIPT_INHERITED,
  19   HB_SCRIPT_ARABIC,
  20   HB_SCRIPT_ARMENIAN,
  21   HB_SCRIPT_BENGALI,
  22   HB_SCRIPT_BOPOMOFO,
  23   HB_SCRIPT_CHEROKEE,
  24   HB_SCRIPT_COPTIC,
  25   HB_SCRIPT_CYRILLIC,
  26   HB_SCRIPT_DESERET,
  27   HB_SCRIPT_DEVANAGARI,
  28   HB_SCRIPT_ETHIOPIC,
  29   HB_SCRIPT_GEORGIAN,
  30   HB_SCRIPT_GOTHIC,
  31   HB_SCRIPT_GREEK,
  32   HB_SCRIPT_GUJARATI,
  33   HB_SCRIPT_GURMUKHI,
  34   HB_SCRIPT_HAN,
  35   HB_SCRIPT_HANGUL,
  36   HB_SCRIPT_HEBREW,
  37   HB_SCRIPT_HIRAGANA,
  38   HB_SCRIPT_KANNADA,
  39   HB_SCRIPT_KATAKANA,
  40   HB_SCRIPT_KHMER,
  41   HB_SCRIPT_LAO,
  42   HB_SCRIPT_LATIN,
  43   HB_SCRIPT_MALAYALAM,
  44   HB_SCRIPT_MONGOLIAN,
  45   HB_SCRIPT_MYANMAR,
  46   HB_SCRIPT_OGHAM,
  47   HB_SCRIPT_OLD_ITALIC,
  48   HB_SCRIPT_ORIYA,
  49   HB_SCRIPT_RUNIC,
  50   HB_SCRIPT_SINHALA,
  51   HB_SCRIPT_SYRIAC,
  52   HB_SCRIPT_TAMIL,
  53   HB_SCRIPT_TELUGU,
  54   HB_SCRIPT_THAANA,
  55   HB_SCRIPT_THAI,
  56   HB_SCRIPT_TIBETAN,
  57   HB_SCRIPT_CANADIAN_ABORIGINAL,
  58   HB_SCRIPT_YI,
  59   HB_SCRIPT_TAGALOG,
  60   HB_SCRIPT_HANUNOO,
  61   HB_SCRIPT_BUHID,
  62   HB_SCRIPT_TAGBANWA,
  63
  64   /* Unicode-4.0 additions */
  65   HB_SCRIPT_BRAILLE,
  66   HB_SCRIPT_CYPRIOT,
  67   HB_SCRIPT_LIMBU,
  68   HB_SCRIPT_OSMANYA,
  69   HB_SCRIPT_SHAVIAN,
  70   HB_SCRIPT_LINEAR_B,
  71   HB_SCRIPT_TAI_LE,
  72   HB_SCRIPT_UGARITIC,
  73
  74   /* Unicode-4.1 additions */
  75   HB_SCRIPT_NEW_TAI_LUE,
  76   HB_SCRIPT_BUGINESE,
  77   HB_SCRIPT_GLAGOLITIC,
  78   HB_SCRIPT_TIFINAGH,
  79   HB_SCRIPT_SYLOTI_NAGRI,
  80   HB_SCRIPT_OLD_PERSIAN,
  81   HB_SCRIPT_KHAROSHTHI,
  82
  83   /* Unicode-5.0 additions */
  84   HB_SCRIPT_UNKNOWN,
  85   HB_SCRIPT_BALINESE,
  86   HB_SCRIPT_CUNEIFORM,
  87   HB_SCRIPT_PHOENICIAN,
  88   HB_SCRIPT_PHAGS_PA,
  89   HB_SCRIPT_NKO,
  90
  91   /* Unicode-5.1 additions */
  92   HB_SCRIPT_KAYAH_LI,
  93   HB_SCRIPT_LEPCHA,
  94   HB_SCRIPT_REJANG,
  95   HB_SCRIPT_SUNDANESE,
  96   HB_SCRIPT_SAURASHTRA,
  97   HB_SCRIPT_CHAM,
  98   HB_SCRIPT_OL_CHIKI,
  99   HB_SCRIPT_VAI,
 100   HB_SCRIPT_CARIAN,
 101   HB_SCRIPT_LYCIAN,
 102   HB_SCRIPT_LYDIAN,
 103
 104   /* Unicode-5.2 additions */
 105   HB_SCRIPT_AVESTAN,
 106   HB_SCRIPT_BAMUM,
 107   HB_SCRIPT_EGYPTIAN_HIEROGLYPHS,
 108   HB_SCRIPT_IMPERIAL_ARAMAIC,
 109   HB_SCRIPT_INSCRIPTIONAL_PAHLAVI,
 110   HB_SCRIPT_INSCRIPTIONAL_PARTHIAN,
 111   HB_SCRIPT_JAVANESE,
 112   HB_SCRIPT_KAITHI,
 113   HB_SCRIPT_TAI_THAM,
 114   HB_SCRIPT_LISU,
 115   HB_SCRIPT_MEETEI_MAYEK,
 116   HB_SCRIPT_OLD_SOUTH_ARABIAN,
 117   HB_SCRIPT_OLD_TURKIC,
 118   HB_SCRIPT_SAMARITAN,
 119   HB_SCRIPT_TAI_VIET,
 120
 121   /* Unicode-6.0 additions */
 122   HB_SCRIPT_BATAK,
 123   HB_SCRIPT_BRAHMI,
 124   HB_SCRIPT_MANDAIC
 125 };
 126 #endif
 127
 128 #ifdef OT_SUPPORT
 129 /* FIXME: doc. returns #items */
 130 EAPI int
 131 evas_common_font_ot_cluster_size_get(const Evas_Text_Props *props, size_t char_index)
 132 {
 133    int i;
 134    int items;
 135    int left_bound, right_bound;
 136    size_t base_cluster;
 137    char_index += props->start;
 138    base_cluster = EVAS_FONT_OT_POS_GET(props->info->ot[char_index]);
 139    for (i = (int) char_index ;
 140          (i >= (int) props->start) &&
 141          (EVAS_FONT_OT_POS_GET(props->info->ot[i]) == base_cluster) ;
 142          i--)
 143      ;
 144    left_bound = i;
 145    for (i = (int) char_index + 1;
 146          (i < (int) (props->start + props->len)) &&
 147          (EVAS_FONT_OT_POS_GET(props->info->ot[i]) == base_cluster) ;
 148          i++)
 149      ;
 150    right_bound = i;
 151
 152    if (right_bound == left_bound)
 153      {
 154         items = 1;
 155      }
 156    else if (props->bidi.dir == EVAS_BIDI_DIRECTION_RTL)
 157      {
 158         if (left_bound < 0)
 159           {
 160              items = props->text_offset + props->text_len - base_cluster;
 161           }
 162         else
 163           {
 164              items = props->info->ot[left_bound].source_cluster - base_cluster;
 165           }
 166      }
 167    else
 168      {
 169         if (right_bound >= (int) (props->text_offset + props->text_len))
 170           {
 171              items = props->text_offset + props->text_len - base_cluster;
 172           }
 173         else
 174           {
 175              items = props->info->ot[right_bound].source_cluster - base_cluster;
 176           }
 177      }
 178    return (items > 0) ? items : 1;
 179 }
 180
 181 EAPI void
 182 evas_common_font_ot_load_face(void *_font)
 183 {
 184    RGBA_Font_Source *font = (RGBA_Font_Source *) _font;
 185    /* Unload the face if by any chance it's already loaded */
 186    evas_common_font_ot_unload_face(font);
 187    font->hb.face = hb_ft_face_create(font->ft.face, NULL);
 188 }
 189
 190 EAPI void
 191 evas_common_font_ot_unload_face(void *_font)
 192 {
 193    RGBA_Font_Source *font = (RGBA_Font_Source *) _font;
 194    if (!font->hb.face) return;
 195    hb_face_destroy(font->hb.face);
 196    font->hb.face = NULL;
 197 }
 198
 199 /* Harfbuzz font functions */
 200 static hb_font_funcs_t *_ft_font_funcs = NULL;
 201
 202 static hb_codepoint_t
 203 _evas_common_font_ot_hb_get_glyph(hb_font_t *font, hb_face_t *face,
 204     const void *user_data, hb_codepoint_t unicode,
 205     hb_codepoint_t variation_selector)
 206 {
 207    RGBA_Font_Int *fi = (RGBA_Font_Int *) user_data;
 208    return hb_font_funcs_get_glyph_func(_ft_font_funcs)(font, face,
 209       fi->src->ft.face, unicode, variation_selector);
 210 }
 211
 212 static void
 213 _evas_common_font_ot_hb_get_glyph_advance(hb_font_t *font, hb_face_t *face,
 214    const void *user_data, hb_codepoint_t glyph,
 215    hb_position_t *x_advance, hb_position_t *y_advance)
 216 {
 217    /* Use our cache*/
 218    RGBA_Font_Int *fi = (RGBA_Font_Int *) user_data;
 219    RGBA_Font_Glyph *fg;
 220    (void) font;
 221    (void) face;
 222    fg = evas_common_font_int_cache_glyph_get(fi, glyph);
 223    if (fg)
 224      {
 225         *x_advance = fg->glyph->advance.x >> 10;
 226         *y_advance = fg->glyph->advance.y >> 10;
 227      }
 228 }
 229
 230 static void
 231 _evas_common_font_ot_hb_get_glyph_extents(hb_font_t *font, hb_face_t *face,
 232    const void *user_data, hb_codepoint_t glyph, hb_glyph_extents_t *extents)
 233 {
 234    RGBA_Font_Int *fi = (RGBA_Font_Int *) user_data;
 235    hb_font_funcs_get_glyph_extents_func(_ft_font_funcs)(font, face,
 236       fi->src->ft.face, glyph, extents);
 237 }
 238
 239 static hb_bool_t
 240 _evas_common_font_ot_hb_get_contour_point(hb_font_t *font, hb_face_t *face,
 241    const void *user_data, unsigned int point_index, hb_codepoint_t glyph,
 242    hb_position_t *x, hb_position_t *y)
 243 {
 244    RGBA_Font_Int *fi = (RGBA_Font_Int *) user_data;
 245    return hb_font_funcs_get_contour_point_func(_ft_font_funcs)(font, face,
 246       fi->src->ft.face, point_index, glyph, x, y);
 247 }
 248
 249 static hb_position_t
 250 _evas_common_font_ot_hb_get_kerning(hb_font_t *font, hb_face_t *face,
 251    const void *user_data, hb_codepoint_t first_glyph,
 252    hb_codepoint_t second_glyph)
 253 {
 254    RGBA_Font_Int *fi = (RGBA_Font_Int *) user_data;
 255    int kern;
 256    (void) font;
 257    (void) face;
 258    if (evas_common_font_query_kerning(fi, first_glyph, second_glyph, &kern))
 259       return kern;
 260    else
 261       return 0;
 262 }
 263
 264 /* End of harfbuzz font funcs */
 265
 266 static hb_font_funcs_t *
 267 _evas_common_font_ot_font_funcs_get(void)
 268 {
 269    static hb_font_funcs_t *font_funcs = NULL;
 270    if (!font_funcs)
 271      {
 272         _ft_font_funcs = hb_ft_get_font_funcs();
 273         font_funcs = hb_font_funcs_create();
 274         hb_font_funcs_set_glyph_func(font_funcs,
 275             _evas_common_font_ot_hb_get_glyph);
 276         hb_font_funcs_set_glyph_advance_func(font_funcs,
 277             _evas_common_font_ot_hb_get_glyph_advance);
 278         hb_font_funcs_set_glyph_extents_func(font_funcs,
 279             _evas_common_font_ot_hb_get_glyph_extents);
 280         hb_font_funcs_set_contour_point_func(font_funcs,
 281             _evas_common_font_ot_hb_get_contour_point);
 282         hb_font_funcs_set_kerning_func(font_funcs,
 283             _evas_common_font_ot_hb_get_kerning);
 284      }
 285
 286    return font_funcs;
 287 }
 288
 289 static void
 290 _evas_common_font_ot_shape(hb_buffer_t *buffer, RGBA_Font_Int *fi)
 291 {
 292    hb_font_t   *hb_font;
 293
 294    hb_font = hb_ft_font_create(fi->src->ft.face, NULL);
 295    hb_font_set_funcs(hb_font, _evas_common_font_ot_font_funcs_get(), fi, NULL);
 296
 297    hb_shape(hb_font, fi->src->hb.face, buffer, NULL, 0);
 298    hb_font_destroy(hb_font);
 299 }
 300
 301 EAPI Eina_Bool
 302 evas_common_font_ot_populate_text_props(void *_fn, const Eina_Unicode *text,
 303       Evas_Text_Props *props, int len)
 304 {
 305    RGBA_Font *fn = (RGBA_Font *) _fn;
 306    RGBA_Font_Int *fi;
 307    hb_buffer_t *buffer;
 308    hb_glyph_position_t *positions;
 309    hb_glyph_info_t *infos;
 310    int slen;
 311    unsigned int i;
 312    Evas_Font_Glyph_Info *gl_itr;
 313    Evas_Font_OT_Info *ot_itr;
 314    Evas_Coord pen_x = 0;
 315
 316    fi = fn->fonts->data;
 317    /* Load the font needed for this script */
 318      {
 319         /* Skip common chars */
 320         const Eina_Unicode *tmp;
 321         for (tmp = text ;
 322               *tmp &&
 323               evas_common_language_char_script_get(*tmp) == EVAS_SCRIPT_COMMON ;
 324               tmp++)
 325           ;
 326         if (!*tmp && (tmp > text)) tmp--;
 327         evas_common_font_glyph_search(fn, &fi, *tmp);
 328      }
 329    evas_common_font_int_reload(fi);
 330    if (fi->src->current_size != fi->size)
 331      {
 332         FTLOCK();
 333         FT_Activate_Size(fi->ft.size);
 334         FTUNLOCK();
 335         fi->src->current_size = fi->size;
 336      }
 337
 338    if (len < 0)
 339      {
 340         slen = eina_unicode_strlen(text);
 341      }
 342    else
 343      {
 344         slen = len;
 345      }
 346
 347    buffer = hb_buffer_create(slen);
 348    hb_buffer_set_unicode_funcs(buffer, evas_common_language_unicode_funcs_get());
 349    hb_buffer_set_language(buffer, hb_language_from_string(
 350             evas_common_language_from_locale_get()));
 351    hb_buffer_set_script(buffer, _evas_script_to_harfbuzz[props->script]);
 352    hb_buffer_set_direction(buffer,
 353          (props->bidi.dir == EVAS_BIDI_DIRECTION_RTL) ?
 354          HB_DIRECTION_RTL : HB_DIRECTION_LTR);
 355    /* FIXME: add run-time conversions if needed, which is very unlikely */
 356    hb_buffer_add_utf32(buffer, (const uint32_t *) text, slen, 0, slen);
 357
 358    _evas_common_font_ot_shape(buffer, fi);
 359
 360    props->len = hb_buffer_get_length(buffer);
 361    props->info->ot = calloc(props->len,
 362          sizeof(Evas_Font_OT_Info));
 363    props->info->glyph = calloc(props->len,
 364               sizeof(Evas_Font_Glyph_Info));
 365    positions = hb_buffer_get_glyph_positions(buffer, NULL);
 366    infos = hb_buffer_get_glyph_infos(buffer, NULL);
 367    gl_itr = props->info->glyph;
 368    ot_itr = props->info->ot;
 369    for (i = 0 ; i < props->len ; i++)
 370      {
 371         Evas_Coord adv;
 372         ot_itr->source_cluster = infos->cluster;
 373         ot_itr->x_offset = positions->x_offset;
 374         ot_itr->y_offset = positions->y_offset;
 375         gl_itr->index = infos->codepoint;
 376         adv = positions->x_advance;
 377
 378         pen_x += adv;
 379         gl_itr->pen_after = EVAS_FONT_ROUND_26_6_TO_INT(pen_x);
 380
 381         ot_itr++;
 382         gl_itr++;
 383         infos++;
 384         positions++;
 385      }
 386
 387    hb_buffer_destroy(buffer);
 388    evas_common_font_int_use_trim();
 389
 390    return EINA_FALSE;
 391 }
 392
 393 #endif
 394