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[avar] Implement inverse map, unmap

This commit is contained in:
Ebrahim Byagowi 2019-08-07 20:07:58 +04:30 committed by Behdad Esfahbod
parent 981f5a54c3
commit 3348992844
1 changed files with 24 additions and 6 deletions
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28
src/hb-ot-var-avar-table.hh
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@ -49,9 +49,10 @@ struct AxisValueMap
}
public:
F2DOT14 fromCoord; /* A normalized coordinate value obtained using
* default normalization. */
F2DOT14 toCoord; /* The modified, normalized coordinate value. */
F2DOT14 coords[2];
// F2DOT14 fromCoord; /* A normalized coordinate value obtained using
// * default normalization. */
// F2DOT14 toCoord; /* The modified, normalized coordinate value. */
public:
DEFINE_SIZE_STATIC (4);
@ -59,12 +60,13 @@ struct AxisValueMap
struct SegmentMaps : ArrayOf<AxisValueMap>
{
int map (int value) const
int map (int value, unsigned int from_stride = 0, unsigned int to_stide = 1) const
{
/* The following special-cases are not part of OpenType, which requires
* that at least -1, 0, and +1 must be mapped. But we include these as
* part of a better error recovery scheme. */
#define fromCoord coords[from_stride]
#define toCoord coords[to_stide]
if (len < 2)
{
if (!len)
@ -91,8 +93,12 @@ struct SegmentMaps : ArrayOf<AxisValueMap>
return arrayZ[i-1].toCoord +
((arrayZ[i].toCoord - arrayZ[i-1].toCoord) *
(value - arrayZ[i-1].fromCoord) + denom/2) / denom;
#undef toCoord
#undef fromCoord
}
int unmap (int value) const { return map (value, 1, 0); }
public:
DEFINE_SIZE_ARRAY (2, *this);
};
@ -133,6 +139,18 @@ struct avar
}
}
void unmap_coords (int *coords, unsigned int coords_length) const
{
unsigned int count = hb_min (coords_length, axisCount);
const SegmentMaps *map = &firstAxisSegmentMaps;
for (unsigned int i = 0; i < count; i++)
{
coords[i] = map->unmap (coords[i]);
map = &StructAfter<SegmentMaps> (*map);
}
}
protected:
FixedVersion<>version; /* Version of the avar table
* initially set to 0x00010000u */