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[var] Add a new API, hb_font_set_var_named_instance

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This commit is contained in:
Ebrahim Byagowi 2019-07-27 13:33:46 +04:30 committed by Behdad Esfahbod
parent b6a2281f1a
commit 40a4b6ddbd
4 changed files with 65 additions and 0 deletions
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1
docs/harfbuzz-sections.txt
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@ -342,6 +342,7 @@ hb_font_set_user_data
hb_font_set_variations
hb_font_set_var_coords_design
hb_font_set_var_coords_normalized
hb_font_set_var_named_instance
hb_font_subtract_glyph_origin_for_direction
hb_font_t
hb_reference_table_func_t

28
src/hb-font.cc
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@ -1861,6 +1861,7 @@ hb_font_set_variations (hb_font_t *font,
normalized, coords_length);
_hb_font_adopt_var_coords_normalized (font, normalized, coords_length);
}
/**
* hb_font_set_var_coords_design:
*
@ -1881,6 +1882,33 @@ hb_font_set_var_coords_design (hb_font_t *font,
hb_ot_var_normalize_coords (font->face, coords_length, coords, normalized);
_hb_font_adopt_var_coords_normalized (font, normalized, coords_length);
}
/**
* hb_font_set_var_named_instance:
* @font: a font.
* @instance_index: named instance index.
*
* Sets design coords of a font from a named instance index.
*
* Since: REPLACEME
*/
void
hb_font_set_var_named_instance (hb_font_t *font,
unsigned instance_index)
{
if (hb_object_is_immutable (font))
return;
unsigned int coords_length = hb_ot_var_named_instance_get_design_coords (font->face, instance_index, nullptr, nullptr);
float *coords = coords_length ? (float *) calloc (coords_length, sizeof (float)) : nullptr;
if (unlikely (coords_length && !coords))
return;
hb_ot_var_named_instance_get_design_coords (font->face, instance_index, &coords_length, coords);
hb_font_set_var_coords_design (font, coords, coords_length);
free (coords);
}
#endif
/**

4
src/hb-font.h
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@ -705,6 +705,10 @@ HB_EXTERN const int *
hb_font_get_var_coords_normalized (hb_font_t *font,
unsigned int *length);
HB_EXTERN void
hb_font_set_var_named_instance (hb_font_t *font,
unsigned instance_index);
HB_END_DECLS
#endif /* HB_FONT_H */

32
test/api/test-ot-extents-cff.c
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@ -184,6 +184,37 @@ test_extents_cff2_vsindex (void)
hb_font_destroy (font);
}
static void
test_extents_cff2_vsindex_named_instance (void)
{
hb_face_t *face = hb_test_open_font_file ("fonts/AdobeVFPrototype_vsindex.otf");
g_assert (face);
hb_font_t *font = hb_font_create (face);
hb_face_destroy (face);
g_assert (font);
hb_ot_font_set_funcs (font);
hb_font_set_var_named_instance (font, 6); // 6 (BlackMediumContrast): 900, 50
hb_glyph_extents_t extents;
hb_bool_t result = hb_font_get_glyph_extents (font, 1, &extents);
g_assert (result);
g_assert_cmpint (extents.x_bearing, ==, 12);
g_assert_cmpint (extents.y_bearing, ==, 652);
g_assert_cmpint (extents.width, ==, 653);
g_assert_cmpint (extents.height, ==, -652);
result = hb_font_get_glyph_extents (font, 2, &extents);
g_assert (result);
g_assert_cmpint (extents.x_bearing, ==, 6);
g_assert_cmpint (extents.y_bearing, ==, 675);
g_assert_cmpint (extents.width, ==, 647);
g_assert_cmpint (extents.height, ==, -675);
hb_font_destroy (font);
}
int
main (int argc, char **argv)
{
@ -194,6 +225,7 @@ main (int argc, char **argv)
hb_test_add (test_extents_cff1_seac);
hb_test_add (test_extents_cff2);
hb_test_add (test_extents_cff2_vsindex);
hb_test_add (test_extents_cff2_vsindex_named_instance);
return hb_test_run ();
}