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[ft] Add hb_ft_font_changed() 

When the font size or variations settings on underlying FT_Face change,
one can call hb_ft_font_changed() and continue using hb_font created using
hb_ft_font_create().

Fixes https://github.com/behdad/harfbuzz/issues/559

New API:
hb_ft_font_changed()
This commit is contained in:
Behdad Esfahbod 2017-10-12 10:33:16 +02:00
parent 94b3cafc3a
commit 4e4781319b
3 changed files with 21 additions and 3 deletions
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1
docs/harfbuzz-sections.txt
View File

@ -291,6 +291,7 @@ hb_ft_face_create_cached
hb_ft_face_create_referenced
hb_ft_font_create
hb_ft_font_create_referenced
hb_ft_font_changed
hb_ft_font_get_face
hb_ft_font_set_load_flags
hb_ft_font_get_load_flags

15
src/hb-ft.cc
View File

@ -610,6 +610,19 @@ hb_ft_font_create (FT_Face ft_face,
font = hb_font_create (face);
hb_face_destroy (face);
_hb_ft_font_set_funcs (font, ft_face, false);
hb_ft_font_changed (font);
return font;
}
void
hb_ft_font_changed (hb_font_t *font)
{
if (font->destroy != _hb_ft_font_destroy)
return;
hb_ft_font_t *ft_font = (hb_ft_font_t *) font->user_data;
FT_Face ft_face = ft_font->ft_face;
hb_font_set_scale (font,
(int) (((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16),
(int) (((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM + (1u<<15)) >> 16));
@ -640,8 +653,6 @@ hb_ft_font_create (FT_Face ft_face,
free (mm_var);
}
#endif
return font;
}
/**

8
src/hb-ft.h
View File

@ -116,7 +116,13 @@ hb_ft_font_set_load_flags (hb_font_t *font, int load_flags);
HB_EXTERN int
hb_ft_font_get_load_flags (hb_font_t *font);
/* Makes an hb_font_t use FreeType internally to implement font functions. */
/* Call when size or variations settings on underlying FT_Face change. */
HB_EXTERN void
hb_ft_font_changed (hb_font_t *font);
/* Makes an hb_font_t use FreeType internally to implement font functions.
* Note: this internally creates an FT_Face. Use it when you create your
* hb_face_t using hb_face_create(). */
HB_EXTERN void
hb_ft_font_set_funcs (hb_font_t *font);