walkero
/
harfbuzz
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[ot-font] Handle missing vertical metrics tables

This commit is contained in:
Behdad Esfahbod 2014-09-25 17:15:35 +03:00
parent be1cca2702
commit d7c160a153
1 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
src/hb-ot-font.cc
View File

@ -39,11 +39,15 @@ struct metrics_accel_t
{
unsigned int num_metrics;
unsigned int num_advances;
unsigned int default_advance;
const OT::_mtx *table;
hb_blob_t *blob;
inline void init (hb_font_t *font, hb_tag_t _hea_tag, hb_tag_t _mtx_tag)
inline void init (hb_font_t *font,
hb_tag_t _hea_tag, hb_tag_t _mtx_tag,
unsigned int default_advance)
{
this->default_advance = default_advance;
this->num_metrics = font->face->get_num_glyphs ();
hb_blob_t *_hea_blob = OT::Sanitizer<OT::_hea>::sanitize (font->face->reference_table (_hea_tag));
@ -55,6 +59,7 @@ struct metrics_accel_t
if (unlikely (!this->num_advances ||
2 * (this->num_advances + this->num_metrics) < hb_blob_get_length (this->blob)))
{
this->num_metrics = this->num_advances = 0;
hb_blob_destroy (this->blob);
this->blob = hb_blob_get_empty ();
}
@ -69,7 +74,15 @@ struct metrics_accel_t
inline unsigned int get_advance (hb_codepoint_t glyph) const
{
if (unlikely (glyph >= this->num_metrics))
return 0;
{
/* If this->num_metrics is zero, it means we don't have the metrics table
* for this direction: return one EM. Otherwise, it means that the glyph
* index is out of bound: return zero. */
if (this->num_metrics)
return 0;
else
return this->default_advance;
}
if (glyph >= this->num_advances)
glyph = this->num_advances - 1;
@ -80,8 +93,6 @@ struct metrics_accel_t
struct hb_ot_font_t
{
unsigned int num_glyphs;
metrics_accel_t h_metrics;
metrics_accel_t v_metrics;
@ -99,11 +110,11 @@ _hb_ot_font_create (hb_font_t *font)
if (unlikely (!ot_font))
return NULL;
ot_font->num_glyphs = font->face->get_num_glyphs ();
unsigned int upem = font->face->get_upem ();
ot_font->h_metrics.init (font, HB_OT_TAG_hhea, HB_OT_TAG_hmtx);
ot_font->h_metrics.init (font, HB_OT_TAG_hhea, HB_OT_TAG_hmtx, upem>>1);
/* TODO Can we do this lazily? */
ot_font->v_metrics.init (font, HB_OT_TAG_vhea, HB_OT_TAG_vmtx);
ot_font->v_metrics.init (font, HB_OT_TAG_vhea, HB_OT_TAG_vmtx, upem);
ot_font->cmap_blob = OT::Sanitizer<OT::cmap>::sanitize (font->face->reference_table (HB_OT_TAG_cmap));
const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (ot_font->cmap_blob);
@ -233,6 +244,7 @@ hb_ot_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
hb_codepoint_t bottom_glyph HB_UNUSED,
void *user_data HB_UNUSED)
{
/* OpenType doesn't have vertical-kerning other than GPOS. */
return 0;
}