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

Shuffle

This commit is contained in:
Behdad Esfahbod 2017-11-14 20:02:24 -08:00
parent a85d7ead04
commit a7f15959b5
1 changed files with 38 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
src/hb-ot-hmtx-table.hh
View File

@ -67,20 +67,14 @@ struct hmtxvmtx
struct accelerator_t
{
const hmtxvmtx *table;
hb_blob_t *blob;
const HVARVVAR *var;
hb_blob_t *var_blob;
inline void init (hb_face_t *face,
hb_tag_t _hea_tag,
hb_tag_t _mtx_tag,
hb_tag_t _var_tag,
hb_tag_t os2_tag,
unsigned int default_advance = 0)
unsigned int default_advance_ = 0)
{
this->default_advance = default_advance ? default_advance : face->get_upem ();
default_advance = default_advance_ ? default_advance_ : face->get_upem ();
bool got_font_extents = false;
if (os2_tag)
@ -90,72 +84,72 @@ struct hmtxvmtx
#define USE_TYPO_METRICS (1u<<7)
if (0 != (os2_table->fsSelection & USE_TYPO_METRICS))
{
this->ascender = os2_table->sTypoAscender;
this->descender = os2_table->sTypoDescender;
this->line_gap = os2_table->sTypoLineGap;
got_font_extents = (this->ascender | this->descender) != 0;
ascender = os2_table->sTypoAscender;
descender = os2_table->sTypoDescender;
line_gap = os2_table->sTypoLineGap;
got_font_extents = (ascender | descender) != 0;
}
hb_blob_destroy (os2_blob);
}
hb_blob_t *_hea_blob = Sanitizer<_hea>::sanitize (face->reference_table (_hea_tag));
const _hea *_hea_table = Sanitizer<_hea>::lock_instance (_hea_blob);
this->num_advances = _hea_table->numberOfLongMetrics;
num_advances = _hea_table->numberOfLongMetrics;
if (!got_font_extents)
{
this->ascender = _hea_table->ascender;
this->descender = _hea_table->descender;
this->line_gap = _hea_table->lineGap;
got_font_extents = (this->ascender | this->descender) != 0;
ascender = _hea_table->ascender;
descender = _hea_table->descender;
line_gap = _hea_table->lineGap;
got_font_extents = (ascender | descender) != 0;
}
hb_blob_destroy (_hea_blob);
this->has_font_extents = got_font_extents;
has_font_extents = got_font_extents;
this->blob = Sanitizer<hmtxvmtx>::sanitize (face->reference_table (_mtx_tag));
blob = Sanitizer<hmtxvmtx>::sanitize (face->reference_table (_mtx_tag));
/* Cap num_metrics() and num_advances() based on table length. */
unsigned int len = hb_blob_get_length (this->blob);
if (unlikely (this->num_advances * 4 > len))
this->num_advances = len / 4;
this->num_metrics = this->num_advances + (len - 4 * this->num_advances) / 2;
unsigned int len = hb_blob_get_length (blob);
if (unlikely (num_advances * 4 > len))
num_advances = len / 4;
num_metrics = num_advances + (len - 4 * num_advances) / 2;
/* We MUST set num_metrics to zero if num_advances is zero.
* Our get_advance() depends on that. */
if (unlikely (!this->num_advances))
if (unlikely (!num_advances))
{
this->num_metrics = this->num_advances = 0;
hb_blob_destroy (this->blob);
this->blob = hb_blob_get_empty ();
num_metrics = num_advances = 0;
hb_blob_destroy (blob);
blob = hb_blob_get_empty ();
}
this->table = Sanitizer<hmtxvmtx>::lock_instance (this->blob);
table = Sanitizer<hmtxvmtx>::lock_instance (blob);
this->var_blob = Sanitizer<HVARVVAR>::sanitize (face->reference_table (_var_tag));
this->var = Sanitizer<HVARVVAR>::lock_instance (this->var_blob);
var_blob = Sanitizer<HVARVVAR>::sanitize (face->reference_table (_var_tag));
var_table = Sanitizer<HVARVVAR>::lock_instance (var_blob);
}
inline void fini (void)
{
hb_blob_destroy (this->blob);
hb_blob_destroy (this->var_blob);
hb_blob_destroy (blob);
hb_blob_destroy (var_blob);
}
inline unsigned int get_advance (hb_codepoint_t glyph,
hb_font_t *font) const
{
if (unlikely (glyph >= this->num_metrics))
if (unlikely (glyph >= num_metrics))
{
/* If this->num_metrics is zero, it means we don't have the metrics table
/* If num_metrics is zero, it means we don't have the metrics table
* for this direction: return default advance. Otherwise, it means that the
* glyph index is out of bound: return zero. */
if (this->num_metrics)
if (num_metrics)
return 0;
else
return this->default_advance;
return default_advance;
}
return this->table->longMetric[MIN (glyph, (uint32_t) this->num_advances - 1)].advance
+ this->var->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?!
return table->longMetric[MIN (glyph, (uint32_t) num_advances - 1)].advance
+ var_table->get_advance_var (glyph, font->coords, font->num_coords); // TODO Optimize?!
}
public:
@ -163,10 +157,16 @@ struct hmtxvmtx
unsigned short ascender;
unsigned short descender;
unsigned short line_gap;
private:
unsigned int num_metrics;
unsigned int num_advances;
unsigned int default_advance;
const hmtxvmtx *table;
hb_blob_t *blob;
const HVARVVAR *var_table;
hb_blob_t *var_blob;
};
protected: