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[ot] Implement cmap subtable format 13

This commit is contained in:
Behdad Esfahbod 2014-05-12 17:58:31 -04:00
parent 0d75793fae
commit d294a2cb16
1 changed files with 41 additions and 6 deletions
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47
src/hb-ot-cmap-table.hh
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@ -134,9 +134,10 @@ struct CmapSubtableFormat4
DEFINE_SIZE_ARRAY (14, values);
};
struct CmapSubtableFormat12Record
struct CmapSubtableLongGroup
{
friend struct CmapSubtableFormat12;
friend struct CmapSubtableFormat13;
int cmp (hb_codepoint_t codepoint) const
{
@ -153,8 +154,8 @@ struct CmapSubtableFormat12Record
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. */
ULONG glyphID; /* Glyph index; interpretation depends on
* subtable format. */
public:
DEFINE_SIZE_STATIC (12);
};
@ -169,8 +170,8 @@ struct CmapSubtableFormat12
int i = groups.search (codepoint);
if (i == -1)
return false;
const CmapSubtableFormat12Record &group = groups[i];
*glyph = group.startGlyphID + (codepoint - group.startCharCode);
const CmapSubtableLongGroup &group = groups[i];
*glyph = group.glyphID + (codepoint - group.startCharCode);
return true;
}
@ -184,7 +185,38 @@ struct CmapSubtableFormat12
USHORT reserved; /* Reserved; set to 0. */
ULONG length; /* Byte length of this subtable (including the header). */
ULONG language; /* Ignore. */
LongArrayOf<CmapSubtableFormat12Record>
LongArrayOf<CmapSubtableLongGroup>
groups; /* Groupings. */
public:
DEFINE_SIZE_ARRAY (16, groups);
};
struct CmapSubtableFormat13
{
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 CmapSubtableLongGroup &group = groups[i];
*glyph = group.glyphID;
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<CmapSubtableLongGroup>
groups; /* Groupings. */
public:
DEFINE_SIZE_ARRAY (16, groups);
@ -197,6 +229,7 @@ struct CmapSubtable
switch (u.format) {
case 4: return u.format4 .get_glyph(codepoint, glyph);
case 12: return u.format12.get_glyph(codepoint, glyph);
case 13: return u.format13.get_glyph(codepoint, glyph);
default:return false;
}
}
@ -207,6 +240,7 @@ struct CmapSubtable
switch (u.format) {
case 4: return TRACE_RETURN (u.format4 .sanitize (c));
case 12: return TRACE_RETURN (u.format12.sanitize (c));
case 13: return TRACE_RETURN (u.format13.sanitize (c));
default:return TRACE_RETURN (true);
}
}
@ -216,6 +250,7 @@ struct CmapSubtable
USHORT format; /* Format identifier */
CmapSubtableFormat4 format4;
CmapSubtableFormat12 format12;
CmapSubtableFormat13 format13;
} u;
public:
DEFINE_SIZE_UNION (2, format);