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[>64k:glyf] Implement composites for >64k 

Implements https://github.com/be-fonts/boring-expansion-spec/issues/42
This commit is contained in:
Behdad Esfahbod 2022-07-11 21:52:25 -06:00
parent 09de94788b
commit 7549d447ba
1 changed files with 30 additions and 6 deletions
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36
src/OT/glyf/CompositeGlyph.hh
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@ -25,13 +25,16 @@ struct CompositeGlyphRecord
USE_MY_METRICS = 0x0200,
OVERLAP_COMPOUND = 0x0400,
SCALED_COMPONENT_OFFSET = 0x0800,
UNSCALED_COMPONENT_OFFSET = 0x1000
UNSCALED_COMPONENT_OFFSET = 0x1000,
GID_IS_24BIT = 0x2000
};
public:
unsigned int get_size () const
{
unsigned int size = min_size;
/* glyphIndex is 24bit instead of 16bit */
if (flags & GID_IS_24BIT) size += HBGlyphID24::static_size - HBGlyphID16::static_size;
/* arg1 and 2 are int16 */
if (flags & ARG_1_AND_2_ARE_WORDS) size += 4;
/* arg1 and 2 are int8 */
@ -60,7 +63,11 @@ struct CompositeGlyphRecord
bool is_anchored () const { return !(flags & ARGS_ARE_XY_VALUES); }
void get_anchor_points (unsigned int &point1, unsigned int &point2) const
{
const HBUINT8 *p = &StructAfter<const HBUINT8> (glyphIndex);
const auto *p = &StructAfter<const HBUINT8> (flags);
if (flags & GID_IS_24BIT)
p += HBGlyphID24::static_size;
else
p += HBGlyphID16::static_size;
if (flags & ARG_1_AND_2_ARE_WORDS)
{
point1 = ((const HBUINT16 *) p)[0];
@ -101,8 +108,12 @@ struct CompositeGlyphRecord
matrix[0] = matrix[3] = 1.f;
matrix[1] = matrix[2] = 0.f;
const auto *p = &StructAfter<const HBINT8> (flags);
if (flags & GID_IS_24BIT)
p += HBGlyphID24::static_size;
else
p += HBGlyphID16::static_size;
int tx, ty;
const HBINT8 *p = &StructAfter<const HBINT8> (glyphIndex);
if (flags & ARG_1_AND_2_ARE_WORDS)
{
tx = *(const HBINT16 *) p;
@ -145,12 +156,25 @@ struct CompositeGlyphRecord
}
public:
hb_codepoint_t get_gid () const { return glyphIndex; }
void set_gid (hb_codepoint_t gid) { glyphIndex = gid; }
hb_codepoint_t get_gid () const
{
if (flags & GID_IS_24BIT)
return StructAfter<const HBGlyphID24> (flags);
else
return StructAfter<const HBGlyphID16> (flags);
}
void set_gid (hb_codepoint_t gid)
{
if (flags & GID_IS_24BIT)
StructAfter<HBGlyphID24> (flags) = gid;
else
/* TODO assert? */
StructAfter<HBGlyphID16> (flags) = gid;
}
protected:
HBUINT16 flags;
HBGlyphID16 glyphIndex;
HBUINT24 pad;
public:
DEFINE_SIZE_MIN (4);
};