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[kern] Implement Format3 

Untested.
This commit is contained in:
Behdad Esfahbod 2018-11-02 11:56:55 -04:00
parent c6ef5dbd5c
commit 6e06fe162e
1 changed files with 51 additions and 0 deletions
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51
src/hb-ot-kern-table.hh
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@ -239,6 +239,54 @@ struct KernSubTableFormat2
DEFINE_SIZE_MIN (8);
};
struct KernSubTableFormat3
{
inline int get_kerning (hb_codepoint_t left, hb_codepoint_t right, const char *end) const
{
hb_array_t<const FWORD> kernValue = kernValueZ.as_array (kernValueCount);
hb_array_t<const HBUINT8> leftClass = StructAfter<const UnsizedArrayOf<HBUINT8> > (kernValue).as_array (glyphCount);
hb_array_t<const HBUINT8> rightClass = StructAfter<const UnsizedArrayOf<HBUINT8> > (leftClass).as_array (glyphCount);
hb_array_t<const HBUINT8> kernIndex = StructAfter<const UnsizedArrayOf<HBUINT8> > (rightClass).as_array (leftClassCount * rightClassCount);
unsigned int i = leftClass[left] * rightClassCount + rightClass[right];
return kernValue[kernIndex[i]];
}
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (true); /* Disabled. See above. */
return_trace (c->check_struct (this) &&
c->check_range (kernValueZ,
kernValueCount +
glyphCount * 2 +
leftClassCount * rightClassCount));
}
protected:
HBUINT16 glyphCount; /* The number of glyphs in this font. */
HBUINT8 kernValueCount; /* The number of kerning values. */
HBUINT8 leftClassCount; /* The number of left-hand classes. */
HBUINT8 rightClassCount;/* The number of right-hand classes. */
HBUINT8 flags; /* Set to zero (reserved for future use). */
UnsizedArrayOf<FWORD>
kernValueZ; /* The kerning values.
* Length kernValueCount. */
#if 0
UnsizedArrayOf<HBUINT8>
leftClass; /* The left-hand classes.
* Length glyphCount. */
UnsizedArrayOf<HBUINT8>
RightClass; /* The right-hand classes.
* Length glyphCount. */
UnsizedArrayOf<HBUINT8>
kernIndex; /* The indices into the kernValue array.
* Length leftClassCount * rightClassCount */
#endif
public:
DEFINE_SIZE_ARRAY (6, kernValueZ);
};
struct KernSubTable
{
inline int get_kerning (hb_codepoint_t left, hb_codepoint_t right, const char *end, unsigned int format) const
@ -246,6 +294,7 @@ struct KernSubTable
switch (format) {
case 0: return u.format0.get_kerning (left, right);
case 2: return u.format2.get_kerning (left, right, end);
case 3: return u.format3.get_kerning (left, right, end);
default:return 0;
}
}
@ -256,6 +305,7 @@ struct KernSubTable
switch (format) {
case 0: return_trace (u.format0.sanitize (c));
case 2: return_trace (u.format2.sanitize (c));
case 3: return_trace (u.format3.sanitize (c));
default:return_trace (true);
}
}
@ -264,6 +314,7 @@ struct KernSubTable
union {
KernSubTableFormat0 format0;
KernSubTableFormat2 format2;
KernSubTableFormat3 format3;
} u;
public:
DEFINE_SIZE_MIN (0);