src/lib/engines/common/evas_font_ot.c

   1 #include "evas_font_ot.h"
   2
   3 #ifdef OT_SUPPORT
   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 EAPI Eina_Bool
  14 evas_common_font_ot_is_enabled(void)
  15 {
  16 #ifdef OT_SUPPORT
  17    static int ret = -1;
  18    const char *env;
  19    if (ret != -1)
  20      {
  21         return ret;
  22      }
  23
  24    env = getenv("EVAS_USE_OT");
  25    if (env && atoi(env))
  26      {
  27         ret = EINA_TRUE;
  28         return ret;
  29      }
  30 #endif
  31    return EINA_FALSE;
  32 }
  33
  34
  35 #ifdef OT_SUPPORT
  36 static void
  37 _evas_common_font_ot_shape(hb_buffer_t *buffer, FT_Face face)
  38 {
  39    hb_face_t   *hb_face;
  40    hb_font_t   *hb_font;
  41
  42    hb_face = hb_ft_face_create(face, NULL);
  43    hb_font = hb_ft_font_create(face, NULL);
  44
  45    hb_shape(hb_font, hb_face, buffer, NULL, 0);
  46    hb_font_destroy(hb_font);
  47    hb_face_destroy(hb_face);
  48 }
  49
  50 EAPI Eina_Bool
  51 evas_common_font_ot_populate_text_props(void *_fn, const Eina_Unicode *text,
  52       Evas_Text_Props *props, int len)
  53 {
  54    RGBA_Font *fn = (RGBA_Font *) _fn;
  55    RGBA_Font_Int *fi;
  56    hb_buffer_t *buffer;
  57    hb_glyph_position_t *positions;
  58    hb_glyph_info_t *infos;
  59    int slen;
  60    unsigned int i;
  61    if (!evas_common_font_ot_is_enabled()) return EINA_TRUE;
  62    if (props->ot_data)
  63      {
  64         evas_common_font_ot_props_unref(props->ot_data);
  65      }
  66    props->ot_data = calloc(1, sizeof(Evas_Font_OT_Data));
  67    props->ot_data->refcount = 1;
  68
  69    fi = fn->fonts->data;
  70    if (fi->src->current_size != fi->size)
  71      {
  72         FTLOCK();
  73         FT_Activate_Size(fi->ft.size);
  74         FTUNLOCK();
  75         fi->src->current_size = fi->size;
  76      }
  77    /* Load the font needed for this script */
  78    evas_common_font_glyph_search(fn, &fi, *text);
  79
  80    if (len < 0)
  81      {
  82         slen = eina_unicode_strlen(text);
  83      }
  84    else
  85      {
  86         slen = len;
  87      }
  88
  89    buffer = hb_buffer_create(slen);
  90    hb_buffer_set_unicode_funcs(buffer, evas_common_language_unicode_funcs_get());
  91    hb_buffer_set_language(buffer, hb_language_from_string(
  92             evas_common_language_from_locale_get()));
  93    hb_buffer_set_script(buffer, props->script);
  94    hb_buffer_set_direction(buffer,
  95          (props->bidi.dir == EVAS_BIDI_DIRECTION_RTL) ?
  96          HB_DIRECTION_RTL : HB_DIRECTION_LTR);
  97    /* FIXME: add run-time conversions if needed, which is very unlikely */
  98    hb_buffer_add_utf32(buffer, (const uint32_t *) text, slen, 0, slen);
  99
 100    _evas_common_font_ot_shape(buffer, fi->src->ft.face);
 101
 102    props->ot_data->len = hb_buffer_get_length(buffer);
 103    props->ot_data->items = calloc(props->ot_data->len,
 104          sizeof(Evas_Font_OT_Data_Item));
 105    positions = hb_buffer_get_glyph_positions(buffer);
 106    infos = hb_buffer_get_glyph_infos(buffer);
 107    for (i = 0 ; i < props->ot_data->len ; i++)
 108      {
 109         props->ot_data->items[i].index = infos[i].codepoint;
 110         props->ot_data->items[i].source_pos = infos[i].cluster;
 111         props->ot_data->items[i].x_advance = positions[i].x_advance;
 112         props->ot_data->items[i].x_offset = positions[i].x_offset;
 113         props->ot_data->items[i].y_offset = positions[i].y_offset;
 114      }
 115
 116    hb_buffer_destroy(buffer);
 117
 118    return EINA_FALSE;
 119 }
 120
 121 EAPI void
 122 evas_common_font_ot_props_ref(Evas_Font_OT_Data *data)
 123 {
 124    data->refcount++;
 125 }
 126
 127 EAPI void
 128 evas_common_font_ot_props_unref(Evas_Font_OT_Data *data)
 129 {
 130    OTLOCK();
 131    if (--data->refcount == 0)
 132      {
 133         if (data->items)
 134           free(data->items);
 135         free(data);
 136      }
 137    OTUNLOCK();
 138 }
 139 #endif
 140