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[ot] Implement cmap subtable format 12

This commit is contained in:
Behdad Esfahbod 2014-05-12 17:51:15 -04:00
parent 3608a6847e
commit 0d75793fae
2 changed files with 66 additions and 2 deletions
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63
src/hb-ot-cmap-table.hh
View File

@ -134,12 +134,69 @@ struct CmapSubtableFormat4
DEFINE_SIZE_ARRAY (14, values);
};
struct CmapSubtableFormat12Record
{
friend struct CmapSubtableFormat12;
int cmp (hb_codepoint_t codepoint) const
{
if (codepoint < startCharCode) return -1;
if (codepoint > endCharCode) return +1;
return 0;
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (c->check_struct (this));
}
private:
ULONG startCharCode; /* First character code in this group. */
ULONG endCharCode; /* Last character code in this group. */
ULONG startGlyphID; /* Glyph index corresponding to the starting
* character code. */
public:
DEFINE_SIZE_STATIC (12);
};
struct CmapSubtableFormat12
{
friend struct CmapSubtable;
private:
inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
int i = groups.search (codepoint);
if (i == -1)
return false;
const CmapSubtableFormat12Record &group = groups[i];
*glyph = group.startGlyphID + (codepoint - group.startCharCode);
return true;
}
inline bool sanitize (hb_sanitize_context_t *c) {
TRACE_SANITIZE (this);
return TRACE_RETURN (c->check_struct (this) && groups.sanitize (c));
}
protected:
USHORT format; /* Subtable format; set to 12. */
USHORT reserved; /* Reserved; set to 0. */
ULONG length; /* Byte length of this subtable (including the header). */
ULONG language; /* Ignore. */
LongArrayOf<CmapSubtableFormat12Record>
groups; /* Groupings. */
public:
DEFINE_SIZE_ARRAY (16, groups);
};
struct CmapSubtable
{
inline bool get_glyph (hb_codepoint_t codepoint, hb_codepoint_t *glyph) const
{
switch (u.format) {
case 4: return u.format4.get_glyph(codepoint, glyph);
case 4: return u.format4 .get_glyph(codepoint, glyph);
case 12: return u.format12.get_glyph(codepoint, glyph);
default:return false;
}
}
@ -148,7 +205,8 @@ struct CmapSubtable
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return TRACE_RETURN (false);
switch (u.format) {
case 4: return TRACE_RETURN (u.format4.sanitize (c));
case 4: return TRACE_RETURN (u.format4 .sanitize (c));
case 12: return TRACE_RETURN (u.format12.sanitize (c));
default:return TRACE_RETURN (true);
}
}
@ -157,6 +215,7 @@ struct CmapSubtable
union {
USHORT format; /* Format identifier */
CmapSubtableFormat4 format4;
CmapSubtableFormat12 format12;
} u;
public:
DEFINE_SIZE_UNION (2, format);

5
src/hb-ot-font.cc
View File

@ -78,8 +78,13 @@ _hb_ot_font_create (hb_font_t *font)
const OT::cmap *cmap = OT::Sanitizer<OT::cmap>::lock_instance (ot_font->cmap_blob);
const OT::CmapSubtable *subtable = NULL;
/* 32-bit subtables. */
if (!subtable) subtable = cmap->find_subtable (0, 4);
if (!subtable) subtable = cmap->find_subtable (3, 10);
/* 16-bit subtables. */
if (!subtable) subtable = cmap->find_subtable (0, 3);
if (!subtable) subtable = cmap->find_subtable (3, 1);
/* Meh. */
if (!subtable) subtable = &OT::Null(OT::CmapSubtable);
ot_font->cmap = subtable;