forked from enlightenment/efl
199 lines
5.2 KiB
C
199 lines
5.2 KiB
C
#include "evas_font_ot.h"
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#ifdef OT_SUPPORT
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# include <hb.h>
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# include <hb-ft.h>
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#endif
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#include "evas_common.h"
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#include <Eina.h>
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#include "evas_font_private.h"
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EAPI Eina_Bool
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evas_common_font_ot_is_enabled(void)
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{
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#ifdef OT_SUPPORT
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static int ret = -1;
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const char *env;
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if (ret != -1)
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{
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return ret;
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}
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env = getenv("EVAS_USE_OT");
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if (env && atoi(env))
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{
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ret = EINA_TRUE;
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return ret;
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}
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#endif
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return EINA_FALSE;
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}
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#ifdef OT_SUPPORT
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/* FIXME: doc. returns #items */
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EAPI int
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evas_common_font_ot_cluster_size_get(const Evas_Text_Props *props, size_t char_index)
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{
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int i;
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int items;
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int left_bound, right_bound;
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char_index += props->start;
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size_t base_cluster = EVAS_FONT_OT_POS_GET(props->info->ot[char_index]);
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for (i = (int) char_index ;
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(i >= (int) props->start) &&
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(EVAS_FONT_OT_POS_GET(props->info->ot[i]) == base_cluster) ;
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i--)
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;
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left_bound = i;
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for (i = (int) char_index + 1;
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(i < (int) (props->start + props->len)) &&
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(EVAS_FONT_OT_POS_GET(props->info->ot[i]) == base_cluster) ;
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i++)
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;
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right_bound = i;
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if (right_bound == left_bound)
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{
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items = 1;
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}
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else if (props->bidi.dir == EVAS_BIDI_DIRECTION_RTL)
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{
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if (left_bound < 0)
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{
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items = props->start + props->len -
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props->info->ot[left_bound + 1].source_cluster;
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}
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else
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{
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items = props->info->ot[left_bound].source_cluster -
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props->info->ot[left_bound + 1].source_cluster;
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}
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}
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else
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{
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if (right_bound == (int) props->len)
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{
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items = props->start + props->len -
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props->info->ot[right_bound - 1].source_cluster;
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}
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else
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{
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items = props->info->ot[right_bound].source_cluster -
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props->info->ot[right_bound - 1].source_cluster;
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}
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}
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return (items > 0) ? items : 1;
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}
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EAPI void
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evas_common_font_ot_load_face(void *_font)
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{
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RGBA_Font_Source *font = (RGBA_Font_Source *) _font;
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/* Unload the face if by any chance it's already loaded */
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evas_common_font_ot_unload_face(font);
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font->hb.face = hb_ft_face_create(font->ft.face, NULL);
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}
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EAPI void
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evas_common_font_ot_unload_face(void *_font)
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{
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RGBA_Font_Source *font = (RGBA_Font_Source *) _font;
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if (!font->hb.face) return;
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hb_face_destroy(font->hb.face);
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font->hb.face = NULL;
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}
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static void
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_evas_common_font_ot_shape(hb_buffer_t *buffer, RGBA_Font_Source *src)
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{
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hb_font_t *hb_font;
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hb_font = hb_ft_font_create(src->ft.face, NULL);
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hb_shape(hb_font, src->hb.face, buffer, NULL, 0);
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hb_font_destroy(hb_font);
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}
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EAPI Eina_Bool
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evas_common_font_ot_populate_text_props(void *_fn, const Eina_Unicode *text,
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Evas_Text_Props *props, int len)
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{
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RGBA_Font *fn = (RGBA_Font *) _fn;
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RGBA_Font_Int *fi;
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hb_buffer_t *buffer;
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hb_glyph_position_t *positions;
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hb_glyph_info_t *infos;
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int slen;
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unsigned int i;
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if (!evas_common_font_ot_is_enabled()) return EINA_TRUE;
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fi = fn->fonts->data;
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/* Load the font needed for this script */
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{
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/* Skip common chars */
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const Eina_Unicode *tmp;
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for (tmp = text ;
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*tmp &&
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evas_common_language_char_script_get(*tmp) == EVAS_SCRIPT_COMMON ;
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tmp++)
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;
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if (!*tmp && (tmp > text)) tmp--;
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evas_common_font_glyph_search(fn, &fi, *tmp);
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}
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evas_common_font_int_reload(fi);
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if (fi->src->current_size != fi->size)
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{
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FTLOCK();
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FT_Activate_Size(fi->ft.size);
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FTUNLOCK();
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fi->src->current_size = fi->size;
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}
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if (len < 0)
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{
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slen = eina_unicode_strlen(text);
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}
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else
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{
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slen = len;
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}
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buffer = hb_buffer_create(slen);
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hb_buffer_set_unicode_funcs(buffer, evas_common_language_unicode_funcs_get());
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hb_buffer_set_language(buffer, hb_language_from_string(
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evas_common_language_from_locale_get()));
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hb_buffer_set_script(buffer, props->script);
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hb_buffer_set_direction(buffer,
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(props->bidi.dir == EVAS_BIDI_DIRECTION_RTL) ?
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HB_DIRECTION_RTL : HB_DIRECTION_LTR);
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/* FIXME: add run-time conversions if needed, which is very unlikely */
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hb_buffer_add_utf32(buffer, (const uint32_t *) text, slen, 0, slen);
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_evas_common_font_ot_shape(buffer, fi->src);
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props->len = hb_buffer_get_length(buffer);
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props->info->ot = calloc(props->len,
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sizeof(Evas_Font_OT_Info));
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props->info->glyph = calloc(props->len,
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sizeof(Evas_Font_Glyph_Info));
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positions = hb_buffer_get_glyph_positions(buffer);
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infos = hb_buffer_get_glyph_infos(buffer);
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for (i = 0 ; i < props->len ; i++)
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{
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props->info->ot[i].source_cluster = infos[i].cluster;
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props->info->ot[i].x_offset = positions[i].x_offset;
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props->info->ot[i].y_offset = positions[i].y_offset;
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props->info->glyph[i].index = infos[i].codepoint;
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props->info->glyph[i].advance = positions[i].x_advance;
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}
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hb_buffer_destroy(buffer);
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evas_common_font_int_use_trim();
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return EINA_FALSE;
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}
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#endif
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